阅读说明：本技术 一种纤维吸尘无纺布及其生产方法 (Fiber dust-absorption non-woven fabric and production method thereof ) 是由 不公告发明人 于 2021-09-01 设计创作，主要内容包括：本发明涉及非织造材料领域,公开了一种纤维吸尘无纺布及其生产方法,该纤维吸尘无纺布包括相互叠合、带有持久电荷的第一纤维层和第二纤维层；第一/二纤维层分别由细旦/粗旦合成纤维相互缠结构成。第二纤维层中设有若干空腔；空腔在第二纤维层外表面的开口尺寸小于空腔中部的最大尺寸。本发明的纤维吸尘无纺布在第二纤维层中设有小开孔、大空间的空腔,具有容尘效果；此外该无纺布带有持久静电,可依靠静电效应主动捕集微细尘埃颗粒。(The invention relates to the field of non-woven materials, and discloses a fiber dust-absorption non-woven fabric and a production method thereof, wherein the fiber dust-absorption non-woven fabric comprises a first fiber layer and a second fiber layer which are mutually overlapped and have lasting charges; the first/second fibrous layers are each comprised of fine/coarse denier synthetic fibers intertwined with one another. A plurality of cavities are arranged in the second fiber layer; the size of the opening of the cavity on the outer surface of the second fiber layer is smaller than the maximum size of the middle part of the cavity. The fiber dust-absorption non-woven fabric is provided with a cavity with small openings and large space in the second fiber layer, and has a dust-holding effect; in addition, the non-woven fabric has permanent static electricity, and can actively trap fine dust particles by means of the static effect.)

1. A fiber dust absorption non-woven fabric comprises a first fiber layer (1) and a second fiber layer (2) which are mutually overlapped and connected; the method is characterized in that: the first fiber layer is formed by intertwining fine synthetic fibers; the second fiber layer is composed of coarse denier synthetic fibers; the second fiber layer is provided with a plurality of cavities (3) which are communicated with the outer surface and do not penetrate through the first fiber layer; the size of the opening of the cavity on the outer surface of the second fiber layer is smaller than the maximum size of the middle part of the cavity; the fibers of the first fiber layer and the second fiber layer are provided with permanent charges.

2. The fiber dust-absorbing nonwoven fabric according to claim 1, wherein:

the coarse denier synthetic fibers are hollow fibers, the fineness is 5-10 dtex, the length is 10-50 mm, and the crimpness is 5-15/25 mm;

the fine denier synthetic fiber is orange-peel type superfine synthetic fiber, the length of the fine denier synthetic fiber is 10-50 mm, the fineness of the fine denier synthetic fiber before fiber opening is 1-3 dtex, and the fineness of a single fiber after fiber opening is 0.1-0.5 dtex.

3. The fiber dust-absorbing nonwoven fabric according to claim 2, wherein:

the coarse denier synthetic fiber is polypropylene fiber, and the polypropylene fiber contains 0.1-2 wt% of inorganic electret;

the orange-peel superfine synthetic fiber comprises polyamide and polyester.

4. The fiber dust-absorbing nonwoven fabric according to claim 3, wherein: the inorganic electret comprises any one or combination of nano tourmaline powder, nano barium titanate and nano silicon dioxide.

5. The fiber dust-absorbing nonwoven fabric according to claim 1, wherein: the cavity is spherical, the diameter of an opening on the outer surface of the second fiber layer is 1-6 mm, and the maximum diameter of the middle part is 3-12 mm; the distribution density of the outer surface of the second fiber layer is 2-6 pieces/cm²。

6. The fiber dust-absorbing nonwoven fabric according to claim 1, wherein: the mass per unit area of the fiber dust absorption non-woven fabric is 35-100 g/m²Wherein the mass per unit area of the second fiber layer accounts for 60-75% of the total mass of the material.

7. A method of producing a fibrous dust-absorbing nonwoven fabric according to any of claims 1 to 6, comprising the steps of:

(1) making the fine denier synthetic fiber into a fine denier synthetic fiber net, and then mutually reinforcing, tangling and opening the fibers in the fine denier synthetic fiber net to prepare a first fiber layer;

(2) making the coarse denier synthetic fibers into a coarse denier synthetic fiber net, and then overlapping the coarse denier synthetic fiber net on the first fiber layer;

(3) carrying out flat-net spunlace and drum spunlace on the obtained laminated material in sequence, wherein in the spunlace process, fibers in the coarse denier synthetic fiber web and fibers of the first fiber layer are mutually entangled, and simultaneously, the hollow cavity of the coarse denier synthetic fiber web is formed by utilizing salient points on the surface of the drum;

(4) sequentially cleaning the obtained material subjected to spunlace with a degreaser, removing water and drying noise;

(5) and (4) performing electret treatment on the material subjected to noise drying, and coiling to obtain the fiber dust absorption non-woven fabric.

8. The production method according to claim 7, wherein:

in the step (3), the spunlace pressure of the flat-web spunlace is 60-90 kg; the spunlace pressure of the drum spunlace is 50-80 kg;

in the step (4), the material is cleaned by using an ultrasonic cleaning mode, and the cleaning liquid is one or a combination of more of a surfactant solution, a sodium carbonate solution and ethanol; the step of removing the moisture is to remove the redundant moisture in the material by adopting a vacuum suction mode; and drying noise by adopting a hot air penetration type drying method.

9. The production method according to claim 7, wherein: the steps (2) to (5) are realized by adopting a fiber dust-absorption non-woven fabric production device, and the production device sequentially comprises the following components in the material advancing direction: the device comprises a flat screen spunlace unit (4), a drum spunlace unit (5), an oil removal cleaning unit (10), a moisture removal unit (6), a noise drying unit (7), an electret unit (8) and a coiling unit (9);

the drum spunlace unit comprises a drum (51) and a plurality of drum spunlace heads (52) arranged on the outer side of the drum along the circumference; the surface of the rotary drum is provided with a plurality of salient points (53); the shape of the salient point corresponds to the shape of the cavity.

10. The production method according to claim 9, wherein: the electret unit comprises a shell (81), a high-voltage electrostatic generator (82), an electrostatic grounding guide cloth roller set (83) and an electret plate (84);

the high-voltage electrostatic generator is fixed on the shell, the electrostatic grounding cloth guide roller set is positioned in the shell, a cloth inlet (85) and a cloth outlet (86) are respectively formed in the two ends of the electrostatic grounding cloth guide roller set on the shell, the electret plate is fixed above the electrostatic grounding cloth guide roller set in the shell, and a plurality of high-voltage electrostatic emission needles (87) facing downwards are arranged on the electret plate; the electrostatic grounding cloth guide roller group is connected with the high-voltage electrostatic generator through a lead and is grounded; the electret plate is connected with the anode of the high-voltage electrostatic generator through a lead.

Technical Field

The invention relates to the field of non-woven materials, in particular to a fiber dust-absorption non-woven fabric and a production method thereof.

Background

Unlike conventional textiles, nonwoven materials are fiber aggregates formed in a state of single fiber distribution, have high porosity and soft touch, and are therefore widely used in various cleaning materials.

Chinese patent application No. CN201410769870.5 discloses a floor cleaning rag, comprising: superfine fiber flannelette layer, first non-woven fabrics layer, the cotton layer of algae and the second non-woven fabrics layer absorb water, superfine fiber flannelette layer, first non-woven fabrics layer, the cotton layer of algae and the second non-woven fabrics layer from bottom to top in proper order the lamination glue be in the same place, and superfine fiber flannelette layer's lower surface still adheres to there is the bright wax layer, superfine fiber flannelette layer adopts coral fleece, first non-woven fabrics layer and second non-woven fabrics layer all adopt wood pulp fiber non-woven fabrics. Through the mode, the novel mop has the functions of efficiently absorbing dust and resisting bacteria, has the function of brightening the floor, namely has the functions of cleaning and maintaining the floor, can be matched with a flat mop head for use, and is convenient to use, safe and efficient. The technical scheme has the defects of complex preparation process and high production cost.

Chinese patent application No. CN201420260413.9 discloses a wipe with high friction performance, comprising a nonwoven fabric; the working surface of the non-woven fabric is adhered with the working surface of the non-woven fabric into a whole through the linear salient points and/or granular salient points which are distributed irregularly by melt-blowing. The technical scheme has the defects that the cleaning cloth has no dust storage space, no dust absorption function and poor cleaning effect.

Cleaning materials can be generally classified into dry cleaning materials and wet cleaning materials according to the use state of the product; among them, the dry cleaning material is mainly used for cleaning dust, dirt, etc. on the surface of an object, such as making a flat mop, an electronic wiping cloth, an electrostatic wiping cloth, etc. At present, the existing dry cleaning materials mainly have the following problems:

1. the dry cleaning material prepared by the traditional textile technology has high unit area quality and thin thickness; the material has no dust holding space, and has small dust holding amount and poor dust holding performance; the production efficiency is low, and the use cost is high;

2. the dry cleaning materials made by adopting the non-woven process mostly adopt common synthetic fibers, dust is adsorbed mainly by the principle of friction static electricity, the dust adsorption capability of the materials is limited by the performance of the fibers, and the dust adsorption capability is limited;

3. present dry-type non-woven cleaning material adopts ordinary product structure mostly, and the surface of material generally is plain weave, mesh or unsmooth type outward appearance, does not have the dust storage space mostly, and at the cleaning in-process, the dust that attaches to on fibre surface drops easily, causes secondary pollution, influences clean effect.

According to the problems in the prior art, a dust collector with strong dust collection capacity, larger dust storage space and high dust holding capacity is needed to be developed; the dry type non-woven cleaning material has simple production process and low use cost, promotes the upgrading and updating of the traditional dust absorption material and meets the market demand.

Disclosure of Invention

The invention provides a fiber dust-absorption non-woven fabric and a production method thereof, aiming at solving the problems of low dust-absorption capacity, poor dust-holding capacity, complex production process and high cost of dry cleaning materials in the prior art. The fiber dust-absorption non-woven fabric is formed by laminating two layers of fiber layers, and the second fiber layer is provided with a cavity with small holes and large space, so that the problems of poor dust-holding property and low cleaning efficiency of products in the prior art are solved; in addition, the non-woven fabric has lasting static electricity, and can actively trap fine dust particles by means of the static effect, so that the problem of low cleaning capability of the product in the prior art is solved; the production device of the fiber dust-absorption non-woven fabric has the advantages of simple structure, reasonable design and stable quality, can meet the requirement of industrialized production, and solves the problem that no special production equipment exists in the prior art.

The specific technical scheme of the invention is as follows:

in a first aspect, the invention provides a fiber dust-absorption non-woven fabric, which comprises a first fiber layer and a second fiber layer which are overlapped and connected with each other. The first fiber layer is formed by intertwining fine synthetic fibers; the second fiber layer is composed of coarse denier synthetic fibers; the second fiber layer is provided with a plurality of cavities which are communicated with the outer surface and do not penetrate through the first fiber layer; the size of the opening of the cavity on the outer surface of the second fiber layer is smaller than the maximum size of the middle part of the cavity; the fibers of the first fiber layer and the second fiber layer are provided with permanent charges.

The invention relates to a fiber dust-absorption non-woven fabric, which has the conception that:

(1) the main reason for the poor dust holding capacity of the existing dry cleaning materials is that there is no or limited dust holding space in the material. Therefore, the invention is specially provided with a cavity with dust containing function in the second fiber layer, and the opening of the cavity is arranged on the outer surface of the second fiber layer. When the cleaning device is actually used, the outer surface of the second fiber layer is contacted with the cleaned object, and dust and impurities on the surface of the cleaned object can enter the cavity through the cavity opening;

(2) the cavity in the second fiber layer is designed to have a small opening and a large space, namely, the opening size of the cavity is smaller than the middle size of the cavity, so that the product has a large dust holding space, dust and impurities entering the cavity can be locked in the cavity and are not easy to flow out of the opening, and the cleaning efficiency is improved;

(3) the material of the invention is subjected to electrostatic electret treatment, so that the fibers in the first fiber layer and the second fiber layer are provided with permanent static electricity. Because the fibers with lasting static electricity can actively adsorb dust, the dust and impurities on the surface of the cleaned object can be captured by the second fiber layer and adsorbed into the cavity, and the problem of low dust-absorbing capacity of the existing dry cleaning material is solved;

(4) the hollow cavities are arranged in the second fiber layer, and in order to enlarge the dust containing space, the thickness of the second fiber layer needs to be increased, and the fiber web bulkiness of the second fiber layer is improved. Because the coarse denier synthetic fiber has high fineness and large fiber rigidity, and simultaneously the fiber crimpness is higher, the fiber web has fluffy feeling, and the thickening of the fiber web is obvious under the same gram weight. Therefore, the use of coarse denier synthetic fibers in the second fibrous layer of the present invention has a significant effect of increasing the dust holding space of the material.

(5) The first fiber layer in the invention plays a skeleton supporting role in the material, and in order to meet the use requirement, the first fiber layer has certain tensile strength. The fine denier synthetic fiber has low fineness, more fibers, increased entanglement probability among the fibers, and compact and flat fiber net after being reinforced. Therefore, the first fiber layer of the invention adopts fine-denier synthetic fibers, which can improve the structural strength of the material and meet the use requirement.

Preferably, the coarse denier synthetic fibers are hollow fibers, the fineness is 5 to 10dtex, the length is 10 to 50mm, and the crimpness is 5 to 15/25 mm.

The hollow fiber has large volume and light weight, and the fiber net is fluffy and full; suitable fiber length, titer and crimpness are favorable to strengthening the whole thickness of non-woven fabrics, promote the plumpness of cavity, directly influence final dirt effect of holding. Therefore, through repeated experimental studies by the present researchers, the optimal range of the above fiber specifications was determined.

Preferably, the fine denier synthetic fiber is orange-petal type superfine synthetic fiber, the length is 10-50 mm, the fineness before fiber opening is 1-3 dtex, and the single fiber fineness after mechanical fiber opening is 0.1-0.5 dtex.

The orange petal type superfine synthetic fiber is split fiber, the single fiber fineness is extremely low after splitting, the entanglement degree among the fibers is improved, and the main body structure of the material is enhanced; the compact fiber net formed after fiber opening not only improves the dust collection effect, but also can lock fine dust and impurities.

Preferably, the coarse denier synthetic fibers are polypropylene fibers.

Among various synthetic fibers, polypropylene (PP) fibers have low moisture absorption, high specific resistance, and poor conductivity in dried fibers. Therefore, when the material is subjected to electret treatment, the polypropylene has higher resistivity, the capacity of injected charges is larger, the radio frequency loss is extremely low, and the polypropylene fiber subjected to electret treatment has lasting static electricity and can trap fine dust particles by virtue of the static effect.

Preferably, the polypropylene fiber contains 0.1-2 wt% of inorganic electret.

Further preferably, the inorganic electret includes any one or a combination of more of nano tourmaline powder, nano barium titanate and nano silicon dioxide.

The electret is a dielectric material capable of storing charges for a long time, and the electret can generate a lasting and stable electrostatic field on the surface due to a long charge storage period, so that fine dust, bacteria, viruses and the like can be adsorbed by static electricity when approaching the electret. Compared with an organic electret, the inorganic electret adopted by the invention has high stability, can store charges for a long time, and avoids the problems that the charge storage performance of the organic electret is poor, and particularly, the charges are easy to decay under a high-temperature or humid environment to influence the service life of a product.

Preferably, the components of the orange petal type superfine synthetic fiber are composed of polyamide and polyester double components.

Preferably, the cavity is spherical, the diameter of an opening on the outer surface of the second fiber layer is 1-6 mm, and the maximum diameter of the middle part is 3-12 mm.

Preferably, the distribution density of the cavities on the outer surface of the second fiber layer is 2-6/cm²。

The hollow chamber with proper density is beneficial to better absorbing dust, avoids the mutual interference between holes during jacquard weave, causes uneven dust absorption capacity and reduces the cleaning effect.

Preferably, two adjacent rows of cavities on the outer surface of the second fiber layer are arranged in a staggered mode in the longitudinal direction and the transverse direction.

The adjacent cavities are arranged in a staggered mode, so that the dust facing area of the surface of the material and the surface of the cleaned object can be increased, the dust and impurities on the surface of the cleaned object can be favorably scraped, and the cleaning efficiency is improved.

Preferably, the mass per unit area of the fiber dust-absorption non-woven fabric is 35 to 100g/m²Wherein the mass per unit area of the second fiber layer accounts for 60-75% of the total mass of the material.

In the invention, the unit area mass of the product directly influences the thickness, the cavity structure and the breaking strength of the material, and influences the use of the material. While the structure of the second fibrous layer is critical to achieving the benefits of the present invention. Wherein, the distributed cavities in the second fiber layer can play the roles of adsorbing and storing dust and impurities. Therefore, if the second fiber layer has a low mass per unit area and a low thickness, the volume of the inner cavity is too small or a cavity cannot be formed, which affects the absorption and storage of dust. Therefore, the research and development team integrates all use scenes, and obtains the optimal range of the ratio of the mass per unit area of the material to the second-layer fiber through repeated experimental research.

In a second aspect, the invention provides a method for producing a fiber dust-absorption non-woven fabric, which comprises the following steps:

(1) the fine denier synthetic fiber is made into a fine denier synthetic fiber net, and then the fibers in the fine denier synthetic fiber net are mutually reinforced, intertwined and opened to form a first fiber layer.

(2) The coarse denier synthetic fibers are formed into a coarse denier synthetic fiber web, and the coarse denier synthetic fiber web is laminated to the first fiber layer.

(3) And carrying out flat-net spunlace and drum spunlace on the obtained laminated material in sequence, wherein in the spunlace process, fibers in the coarse denier synthetic fiber web and fibers of the first fiber layer are mutually entangled, and simultaneously, the hollow cavity of the coarse denier synthetic fiber web is formed by utilizing the salient points on the surface of the drum.

In the flat-net spunlace process, fibers in the first fiber layer and the coarse denier synthetic fiber net are mutually entangled to realize primary consolidation, the laminated material is adsorbed on the surface of the rotary drum in the rotary drum spunlace process, and the coarse denier synthetic fiber net is attached to the salient points; high-pressure water flow jetted by the rotary drum spunlace head firstly passes through the first fiber layer and then reaches the coarse denier synthetic fiber net, so that fibers in the first fiber layer and the coarse denier synthetic fiber net are further intertwined with each other; under the impact of high-pressure water flow, the coarse denier synthetic fiber net is extruded and embedded into the salient points to form cavities corresponding to the shapes of the salient points.

(4) And sequentially cleaning the material obtained after the water stabbing by using a degreaser, removing water and drying noise.

In general, in order to meet the requirements of normal production and subsequent textile processing of synthetic fibers, an oiling agent is required to be added in the preparation of the fibers so as to eliminate static electricity in production and facilitate entanglement and reinforcement. However, as the fiber dust collecting material in the present invention, the remaining oil solution is not favorable for charging the fibers and storing the electric charge. Therefore, the degreasing agent cleaning procedure is arranged after the spunlace processing, so that the oil agent on the surface of the synthetic fiber is removed, and the electrostatic electret effect of the material is improved.

(5) And (4) performing electret treatment on the material subjected to noise drying, and coiling to obtain the fiber dust absorption non-woven fabric.

Preferably, in the step (3), the spunlace pressure of the flat net is 60-90 kg; the spunlace pressure of the drum spunlace is 50-80 kg.

The team of the invention finds in research that the spunlace pressure of the two spunlace processes has great influence on the performance of the product due to the structural particularity of the fiber dust-absorbing nonwoven fabric of the invention. Specifically, the method comprises the following steps: when the coarse denier synthetic fiber net is consolidated with the first fiber layer, if the water jet pressure is too low, the first fiber net and the second fiber net are layered, the breaking strength of the material is low, and the material is easy to fluff in the using process; if the hydro-entangled pressure is too high, the thickness of the material is reduced, the fullness of the material is affected, the porosity of the material is reduced, and the dust holding rate of the material is reduced. On the other hand, when the material enters a drum spunlace machine, if the spunlace pressure is too low, the effect of a cavity is influenced, the structure of the cavity is not obvious, and the dust holding performance of the material is influenced; if the spunlace pressure is too high, the first fiber layer is broken through, through holes are formed on the surface of the material, a dust collecting space cannot be formed, and the technical effect of the invention cannot be achieved. Therefore, the research and development team of the invention finally determines the optimal range of the water jet pressure through a great deal of repeated experimental research.

Preferably, in the step (4), the material is cleaned by using an ultrasonic cleaning method, and the cleaning liquid is one or a combination of more of a surfactant solution, a sodium carbonate solution and ethanol.

Preferably, in the step (4), the water removal is performed by removing excess water in the material by vacuum suction.

The vacuum suction mode is adopted to remove water, so that the fluffy structure of the cloth surface is kept, and the phenomenon that the cavity on the cloth surface is flattened by adopting a dry rolling roller mode is avoided.

Preferably, in the step (4), the drying noise is dried by hot air penetration.

Drying noise by adopting a hot air penetrating type drying mode; the hot air penetrating type dryer adopts hot air to penetrate through the cloth cover, so that the phenomenon that the surface of a material is tightly attached to a drying cylinder when the drying cylinder is used for drying, and the cavity on the surface of the material is flattened is avoided. In addition, the hot air penetrating material is adopted, so that the friction electrification among material fibers is facilitated, and certain electric charge can be carried.

In a third aspect, the invention provides a device for producing a fiber dust-absorption non-woven fabric, which sequentially comprises the following components in the material advancing direction: the device comprises a flat screen spunlace unit, a drum spunlace unit, an oil removing and cleaning unit, a moisture removing unit, a noise drying unit, an electret unit and a coiling unit.

The drum spunlace unit comprises a drum and a plurality of drum spunlace heads arranged on the outer side of the drum along the circumference; a plurality of salient points are arranged on the surface of the rotary drum; the shape of the salient point corresponds to the shape of the cavity.

Preferably, the height of the salient point is 10-20 mm.

Preferably, the degreasing cleaning unit comprises a cleaning tank; an ultrasonic cleaning head and a plurality of cloth guide rollers are arranged in the cleaning box; cleaning liquid is arranged in the cleaning box; the ultrasonic cleaning head is connected with an ultrasonic generator; further, a heating plate is arranged in the cleaning box; the heating plate can heat the cleaning liquid in the cleaning box, and the oil agent on the surface of the synthetic fiber can be better removed.

Preferably, the degreasing cleaning unit further comprises a cleaning water stabbing head located after the cleaning tank and before the moisture removing unit.

Preferably, the electret unit comprises a shell, a high-voltage electrostatic generator, an electrostatic grounding guide roller set and an electret plate.

The high-voltage electrostatic generator is fixed on the shell, the electrostatic grounding cloth guide roller set is positioned in the shell, a cloth inlet and a cloth outlet are respectively formed in the two ends of the electrostatic grounding cloth guide roller set on the shell, the electret plate is fixed above the electrostatic grounding cloth guide roller set in the shell, and a plurality of high-voltage electrostatic emission needles facing downwards are arranged on the electret plate; the electrostatic grounding cloth guide roller group is connected with the high-voltage electrostatic generator through a lead and is grounded; the electret plate is connected with the anode of the high-voltage electrostatic generator through a lead.

When the electret unit operates, materials enter the electret unit under the transmission and traction of the electrostatic grounding cloth guide roller, the high-voltage electrostatic generator generates 100KV high-voltage electricity, the high-voltage electricity is released to the materials in transmission through the high-voltage electrostatic emission needles on the plurality of electret plates, the electrostatic grounding cloth guide roller corresponding to the electret plates receives the static electricity, and the materials are subjected to normal-temperature bipolar corona electret treatment to become permanent charged fiber electrets.

Preferably, the flat-wire hydroentangling unit comprises a circularly rotating carrier web curtain, a flat-wire hydroentangling head facing the upper surface of the carrier web curtain and a vacuum suction device facing the lower surface of the carrier web curtain.

Compared with the prior art, the invention has the beneficial effects that:

(1) the invention adopts coarse denier synthetic fiber to arrange a cavity with small holes and large space in the second fiber layer. The cavity opening is arranged on the outer surface of the second fiber layer, the cavity structure is stable, the dust holding effect is achieved, dust and impurities on the surface of a cleaned object can be stored and locked in the cavity, the dust and the impurities are not prone to flowing out of the opening, and the problems that a product in the prior art is poor in dust holding performance and low in cleaning efficiency are solved;

(2) the non-woven fabric is subjected to the procedures of degreasing agent cleaning and electrostatic electret treatment, the surface of the non-woven fabric is enabled to generate an electrostatic field by using a high-voltage discharge technology, and charges in the electrostatic field are retained in the first fiber layer and the second fiber layer, so that the material is provided with lasting static electricity, fine dust particles can be actively trapped by means of an electrostatic adsorption effect, the dust absorption rate of the material is improved, and the problem of low cleaning capability of products in the prior art is solved;

(3) the product of the invention is produced on a continuous production line by one-step forming, and has high production efficiency, short preparation flow and low product cost; the special production equipment for the product has the advantages of simple structure, reasonable design and stable quality, can meet the requirement of industrialized production, and solves the problem that no special production equipment exists in the prior art.

Drawings

FIG. 1 is a schematic perspective view of a fibrous dust-absorbing nonwoven fabric according to the present invention;

FIG. 2 is a schematic cross-sectional view of a fiber dust-absorbing nonwoven fabric according to the present invention;

FIG. 3 is a schematic structural view of a device for producing a fiber dust-absorbing nonwoven fabric according to the present invention;

FIG. 4 is a schematic side view of an electret unit in the apparatus for producing a fiber dust-absorption nonwoven fabric of the present invention;

FIG. 5 is a graph showing the surface potential of the nonwoven fabrics of example 2 and comparative example 3 of the present invention as a function of time.

The reference signs are: the device comprises a first fiber layer 1, a second fiber layer 2, a cavity 3, a flat screen spunlace unit 4, a rotary drum spunlace unit 5, a moisture removal unit 6, a noise drying unit 7, an electret unit 8, a coiling unit 9, an oil removal cleaning unit 10, a screen supporting curtain 41, a flat screen spunlace head 42, a vacuum suction device 43, a rotary drum 51, a rotary drum spunlace head 52, bumps 53, a shell 81, a high-voltage electrostatic generator 82, an electrostatic grounding guide roller set 83, an electret plate 84, a cloth inlet 85, a cloth outlet 86, a high-voltage electrostatic emission needle 87, a cleaning box 1001, an ultrasonic cleaning head 1002, a heating plate 1003 and a cleaning liquid 1004.

Detailed Description

The present invention will be further described with reference to the following examples. The devices, connections, and methods referred to in this disclosure are those known in the art, unless otherwise indicated.

General examples

As shown in figure 1-2, a fiber dust-absorption non-woven fabric with a mass per unit area of 35-100 g/m²The fiber layer comprises a first fiber layer 1 and a second fiber layer 2 which are mutually overlapped and connected; the fibers of the first fiber layer and the second fiber layer are provided with permanent charges. Wherein the mass per unit area of the second fiber layer accounts for 60-75% of the total mass of the material.

The first fiber layer is formed by intertwining fine synthetic fibers; the fine denier synthetic fiber is orange-peel type superfine synthetic fiber, the components of the fine denier synthetic fiber consist of polyamide and polyester, the length of the fine denier synthetic fiber is 10-50 mm, the fineness of the fine denier synthetic fiber before fiber opening is 1-3 dtex, and the fineness of a single fiber after mechanical fiber opening is 0.1-0.5 dtex.

The second fibrous layer is comprised of coarse denier synthetic fibers. The coarse denier synthetic fibers are hollow fibers, the material is polypropylene, the fineness is 5-10 dtex, the length is 10-50 mm, and the crimpness is 5-15/25 mm. The polypropylene fiber contains 0.1-2 wt% of inorganic electret; the electret comprises any one or combination of nano tourmaline powder, nano barium titanate and nano silicon dioxide. The second fiber layer is provided with a plurality of spherical cavities 3 which are communicated with the outer surface and do not penetrate through the first fiber layer; the diameter of an opening of the cavity on the outer surface of the second fiber layer is 1-6 mm, the maximum diameter of the middle part of the cavity is 3-12 mm, and the size of the opening is smaller than the maximum size of the middle part of the cavity; two adjacent rows of cavities on the outer surface of the second fiber layer are staggered in the longitudinal direction and the transverse direction, and the distribution density is 2-6/cm²。

As shown in fig. 3, a device for producing a fiber dust-absorbing nonwoven fabric sequentially comprises, in the direction of material travel: the device comprises a flat screen spunlace unit 4, a drum spunlace unit 5, an oil removal cleaning unit 10, a moisture removal unit 6, a noise drying unit 7, an electret unit 8 and a coiling unit 9. Wherein:

the flat-wire hydroentangling unit comprises a cyclically rotating carrier web 41, a flat-wire hydroentangling head 42 directed towards the upper surface of the carrier web, and a vacuum suction device 43 directed towards the lower surface of the carrier web.

The drum spunlace unit comprises a drum 51 and a plurality of drum spunlace heads 52 arranged along the circumference outside the drum; the surface of the rotary drum is provided with a plurality of salient points 53 with the height of 10-20 mm; the shape of the salient point corresponds to the shape of the cavity.

The deoiling cleaning unit comprises a cleaning box 1001 and a cleaning spunlace head; an ultrasonic cleaning head 1002, a plurality of cloth guide rollers 11 and a heating plate 1003 are arranged in the cleaning box; a cleaning liquid 1004 is arranged in the cleaning box; the ultrasonic cleaning head 1002 is connected with an ultrasonic generator; the cleaning water stabs are positioned behind the cleaning box and in front of the moisture removing unit.

The moisture removal unit is a vacuum extractor.

The noise drying unit is a hot air penetration dryer.

As shown in fig. 4, the electret unit includes a housing 81, a high-voltage electrostatic generator 82, an electrostatic grounding guide roller group 83, and an electret plate 84. The high-voltage electrostatic generator is fixed on the shell, the electrostatic grounding cloth guide roller set is positioned in the shell, a cloth inlet 85 and a cloth outlet 86 are respectively formed in the two ends of the electrostatic grounding cloth guide roller set on the shell, the electret plate is fixed above the electrostatic grounding cloth guide roller set in the shell, and a plurality of high-voltage electrostatic emission needles 87 facing downwards are arranged on the electret plate; the electrostatic grounding cloth guide roller group is connected with the high-voltage electrostatic generator through a lead and is grounded; the electret plate is connected with the anode of the high-voltage electrostatic generator through a lead.

When the electret unit operates, the material enters the electret unit under the transmission and traction of the electrostatic grounding cloth guide roller; the high-voltage electrostatic generator generates 100KV high-voltage electricity, the 100KV high-voltage electricity is released to the material in transmission through high-voltage electrostatic emitting needles on a plurality of electret plates, an electrostatic grounding cloth guide roller corresponding to the electret plates receives the static electricity, and normal-temperature bipolar corona electret treatment is carried out on the material to enable the material to become a permanent charged fiber electret.

A production method of fiber dust-absorption non-woven fabric comprises the following steps:

(1) the fine denier synthetic fiber is made into a fine denier synthetic fiber net, and then the fibers in the fine denier synthetic fiber net are mutually reinforced, intertwined and opened to form a first fiber layer.

(2) The coarse denier synthetic fibers are formed into a coarse denier synthetic fiber web, and the coarse denier synthetic fiber web is laminated to the first fiber layer.

(3) Carrying out flat-net spunlace on the obtained laminated material at the spunlace pressure of 60-90 kg, and then carrying out drum spunlace at the spunlace pressure of 50-80 kg. In the drum spunlace process, the laminated material is adsorbed on the surface of the drum, and the coarse denier synthetic fiber net is attached to the salient points; high-pressure water flow jetted by the rotary drum spunlace head firstly passes through the first fiber layer and then reaches the coarse denier synthetic fiber net, so that the fibers in the first fiber layer and the coarse denier synthetic fiber net are mutually entangled; under the impact of high-pressure water flow, the coarse denier synthetic fiber net is extruded and embedded into the salient points to form cavities corresponding to the shapes of the salient points.

(4) And sequentially carrying out ultrasonic degreasing agent cleaning, vacuum suction and hot air penetrating type drying treatment on the material obtained after the spunlace. The cleaning solution is one or a combination of more of a surfactant solution, a sodium carbonate solution and ethanol.

(5) And (4) performing electret treatment on the material subjected to noise drying, and coiling to obtain the fiber dust absorption non-woven fabric.

Example 1

A fiber dust-absorption non-woven fabric with the mass per unit area of 35g/m²The fiber layer comprises a first fiber layer 1 and a second fiber layer 2 which are mutually overlapped and connected; the fibers of the first fiber layer and the second fiber layer are provided with permanent charges. Wherein the second fibrous layer has a mass per unit area of 60% of the total mass of the material.

The first fiber layer is formed by intertwining fine synthetic fibers; the fine denier synthetic fiber is orange-peel type superfine synthetic fiber, the components of the fine denier synthetic fiber consist of polyamide and polyester double components, the length of the fine denier synthetic fiber is 10mm, the fineness of the fine denier synthetic fiber before fiber opening is 1dtex, and the fineness of a single fiber after spunlace fiber opening is 0.1 dtex.

The second fibrous layer is comprised of coarse denier synthetic fibers. The coarse denier synthetic fibers are hollow fibers, the material is polypropylene, the fineness is 5dtex, the length is 10mm, and the crimpness is 5/25 mm. The polypropylene fiber contains 1 wt% of nano tourmaline powder. The second fiber layer is provided with a plurality of spherical cavities 3 which are communicated with the outer surface and do not penetrate through the first fiber layer; the diameter of an opening of the cavity on the outer surface of the second fiber layer is 1mm, the maximum diameter of the middle part of the cavity is 3mm, and the size of the opening is smaller than the maximum size of the middle part of the cavity; two adjacent rows of cavities on the outer surface of the second fiber layer are staggered in the longitudinal direction and the transverse direction, and the distribution density is 2/cm²。

As shown in fig. 3, a device for producing a fiber dust-absorbing nonwoven fabric sequentially comprises, in the direction of material travel: the device comprises a flat screen spunlace unit 4, a drum spunlace unit 5, an oil removal cleaning unit 10, a moisture removal unit 6, a noise drying unit 7, an electret unit 8 and a coiling unit 9. Wherein:

the flat-wire hydroentangling unit comprises a cyclically rotating carrier web 41, a flat-wire hydroentangling head 42 directed towards the upper surface of the carrier web, and a vacuum suction device 43 directed towards the lower surface of the carrier web. The drum spunlace unit comprises a drum 51 and 2 drum spunlace heads 52 arranged on the outer side of the drum along the circumference; a plurality of salient points 53 with the height of 10mm are arranged on the surface of the rotary drum; the shape of the salient point corresponds to the shape of the cavity. The deoiling cleaning unit comprises a cleaning box 1001 and a cleaning spunlace head; an ultrasonic cleaning head 1002, 6 cloth guide rollers 11 and a heating plate 1003 are arranged in the cleaning box; the cleaning water stabs are positioned behind the cleaning box and in front of the moisture removing unit. The moisture removal unit is a vacuum extractor. The noise drying unit is a hot air penetration dryer.

As shown in fig. 4, the electret unit includes a housing 81, a high-voltage electrostatic generator 82, an electrostatic grounding guide roller group 83, and an electret plate 84. The high-voltage electrostatic generator is fixed on the shell, the electrostatic grounding cloth guide roller set is positioned in the shell, a cloth inlet 85 and a cloth outlet 86 are respectively formed in the two ends of the electrostatic grounding cloth guide roller set on the shell, the electret plate is fixed above the electrostatic grounding cloth guide roller set in the shell, and a plurality of high-voltage electrostatic emission needles 87 facing downwards are arranged on the electret plate; the electrostatic grounding cloth guide roller group is connected with the high-voltage electrostatic generator through a lead and is grounded; the electret plate is connected with the anode of the high-voltage electrostatic generator through a lead.

A method for preparing a fiber dust-absorption non-woven fabric, as shown in fig. 3 and 4, comprising the following steps:

1. opening and carding a fiber net on 1dtex polyamide and polyester bi-component orange petal type superfine fiber, and then carrying out spunlace reinforcement and entanglement and fiber opening on the fiber to prepare a first fiber layer;

2. 5dtex hollow polypropylene fiber is made into a coarse denier synthetic fiber net after opening and carding; then overlapping the coarse denier synthetic fiber net on the first fiber layer;

3. carrying out spunlace treatment on the laminated material; firstly, adopting a flat screen to carry out spunlace consolidation on a coarse denier synthetic fiber net and a first fiber layer, wherein the spunlace pressure is 70 kg; then sending the material into a drum spunlace machine, wherein the surface of the drum is provided with salient points, the shapes of the salient points are adapted to the shapes of the cavities, and the widths of the bottoms of the salient points are smaller than the widths of the upper parts of the salient points; the laminated material is adsorbed on the surface of the rotary drum, and the coarse denier synthetic fiber net is attached to the salient points; 2 water stabs are arranged on the outer side of the rotary drum along the circumference and are opposite to the surface of the first fiber layer; high-pressure water flow jetted from the rotary drum spunlace head firstly passes through the first fiber layer and then reaches the coarse denier synthetic fiber net, so that the fibers in the first fiber layer and the coarse denier synthetic fiber net are mutually entangled; under the impact of high-pressure water flow, the coarse denier synthetic fiber net is extruded and embedded into the salient points to form cavities corresponding to the shapes of the salient points; the drum spunlace pressure is 60 kg;

4. cleaning the spunlaced material by using an ultrasonic degreaser, and removing redundant water by adopting a vacuum suction mode; drying the material by a hot air penetrating type dryer; the cleaning solution is a surfactant solution.

5. Feeding the material subjected to noise drying into an electret unit, and applying charges on the material; and then the materials are coiled and packaged to prepare the fiber dust absorption non-woven fabric.

Example 2

A fiber dust-absorption non-woven fabric with the mass per unit area of 65g/m²The fiber layer comprises a first fiber layer 1 and a second fiber layer 2 which are mutually overlapped and connected; the fibers of the first fiber layer and the second fiber layer are provided with permanent charges. Wherein the second fibrous layer has a mass per unit area percentage of 68% of the total mass of the material.

The first fiber layer is formed by intertwining fine synthetic fibers; the fine denier synthetic fiber is orange-peel type superfine synthetic fiber, the component of the fine denier synthetic fiber is composed of polyamide and polyester, the length of the fine denier synthetic fiber is 38mm, the fineness of the fine denier synthetic fiber before fiber opening is 2dtex, and the fineness of a single fiber after spunlace fiber opening is 0.3 dtex.

The second fibrous layer is comprised of coarse denier synthetic fibers. The coarse denier synthetic fibers are hollow fibers, the material is polypropylene, the fineness is 8dtex, the length is 38mm, and the crimpness is 10/25 mm. The polypropylene fiber contains 0.1 wt% of nano barium titanate and nano silicon dioxide. The second fiber layer is provided with a plurality of spherical cavities 3 which are communicated with the outer surface and do not penetrate through the first fiber layer; the diameter of an opening of the cavity on the outer surface of the second fiber layer is 4mm, the maximum diameter of the middle part of the cavity is 8mm, and the size of the opening is smaller than the maximum size of the middle part of the cavity; two adjacent rows of cavities on the outer surface of the second fiber layer are staggered in the longitudinal direction and the transverse direction,the distribution density is 4/cm²。

As shown in fig. 3, a device for producing a fiber dust-absorbing nonwoven fabric sequentially comprises, in the direction of material travel: the device comprises a flat screen spunlace unit 4, a drum spunlace unit 5, an oil removal cleaning unit 10, a moisture removal unit 6, a noise drying unit 7, an electret unit 8 and a coiling unit 9. Wherein:

the flat-wire hydroentangling unit comprises a cyclically rotating carrier web 41, a flat-wire hydroentangling head 42 directed towards the upper surface of the carrier web, and a vacuum suction device 43 directed towards the lower surface of the carrier web. The drum spunlace unit comprises a drum 51 and 2 drum spunlace heads 52 arranged on the outer side of the drum along the circumference; the surface of the rotary drum is provided with a plurality of salient points 53 with the height of 15 mm; the shape of the salient point corresponds to the shape of the cavity. The deoiling cleaning unit comprises a cleaning box 1001 and a cleaning spunlace head; an ultrasonic cleaning head 1002, 6 cloth guide rollers 11 and a heating plate 1003 are arranged in the cleaning box; a cleaning liquid 1004 is arranged in the cleaning box; the ultrasonic cleaning head 1002 is connected with an ultrasonic generator; the cleaning water stabs are positioned behind the cleaning box and in front of the moisture removing unit. The moisture removal unit is a vacuum extractor. The noise drying unit is a hot air penetration dryer.

As shown in fig. 4, the electret unit includes a housing 81, a high-voltage electrostatic generator 82, an electrostatic grounding guide roller group 83, and an electret plate 84. The high-voltage electrostatic generator is fixed on the shell, the electrostatic grounding cloth guide roller set is positioned in the shell, a cloth inlet 85 and a cloth outlet 86 are respectively formed in the two ends of the electrostatic grounding cloth guide roller set on the shell, the electret plate is fixed above the electrostatic grounding cloth guide roller set in the shell, and a plurality of high-voltage electrostatic emission needles 87 facing downwards are arranged on the electret plate; the electrostatic grounding cloth guide roller group is connected with the high-voltage electrostatic generator through a lead and is grounded; the electret plate is connected with the anode of the high-voltage electrostatic generator through a lead.

A method for preparing a fiber dust-absorption non-woven fabric, as shown in fig. 3 and 4, comprising the following steps:

1. opening and carding two-component orange-petal type superfine fibers of 2dtex polyamide and polyester to prepare a fiber net, and then carrying out spunlace reinforcement and entanglement and fiber opening on the fibers to prepare a first fiber layer;

2. opening and carding 8dtex hollow polypropylene fibers to prepare a coarse denier synthetic fiber net; then overlapping the coarse denier synthetic fiber net on the first fiber layer;

3. carrying out spunlace treatment on the laminated material; firstly, adopting a flat screen to carry out spunlace consolidation on a coarse denier synthetic fiber net and a first fiber layer, wherein the spunlace pressure is 60 kg; then sending the material into a drum spunlace machine, wherein the surface of the drum is provided with salient points, the shapes of the salient points are adapted to the shapes of the cavities, and the widths of the bottoms of the salient points are smaller than the widths of the upper parts of the salient points; the laminated material is adsorbed on the surface of the rotary drum, and the coarse denier synthetic fiber net is attached to the salient points; 2 water stabs are arranged on the outer side of the rotary drum along the circumference and are opposite to the surface of the first fiber layer; high-pressure water flow jetted from the rotary drum spunlace head firstly passes through the first fiber layer and then reaches the coarse denier synthetic fiber net, so that the fibers in the first fiber layer and the coarse denier synthetic fiber net are mutually entangled; under the impact of high-pressure water flow, the coarse denier synthetic fiber net is extruded and embedded into the salient points to form cavities corresponding to the shapes of the salient points; the drum spunlace pressure is 50 kg;

4. cleaning the spunlaced material by using an ultrasonic degreaser, and removing redundant water by adopting a vacuum suction mode; drying the material by a hot air penetrating type dryer; the cleaning solution is a sodium carbonate solution.

5. Feeding the material subjected to noise drying into an electret unit, and applying charges on the material; and then the materials are coiled and packaged to prepare the fiber dust absorption non-woven fabric.

Example 3

A fiber dust-absorption non-woven fabric with the mass per unit area of 100g/m²The fiber layer comprises a first fiber layer 1 and a second fiber layer 2 which are mutually overlapped and connected; the fibers of the first fiber layer and the second fiber layer are provided with permanent charges. Wherein the second fibrous layer has a mass per unit area of 75% of the total mass of the material.

The first fiber layer is formed by intertwining fine synthetic fibers; the fine denier synthetic fiber is orange-peel type superfine synthetic fiber, the components of the fine denier synthetic fiber consist of polyamide and polyester double components, the length of the fine denier synthetic fiber is 50mm, the fineness of the fine denier synthetic fiber before fiber opening is 3dtex, and the fineness of a single fiber after spunlace fiber opening is 0.5 dtex.

The second fibrous layer is comprised of coarse denier synthetic fibers. The coarse denier synthetic fibers are hollow fibers, the material is polypropylene, the fineness is 10dtex, the length is 50mm, and the crimpness is 15/25 mm. The polypropylene fiber contains 2wt% of nano tourmaline powder and nano barium titanate. The second fiber layer is provided with a plurality of spherical cavities 3 which are communicated with the outer surface and do not penetrate through the first fiber layer; the diameter of an opening of the cavity on the outer surface of the second fiber layer is 6mm, the maximum diameter of the middle part of the cavity is 12mm, and the size of the opening is smaller than the maximum size of the middle part of the cavity; two adjacent rows of cavities on the outer surface of the second fiber layer are staggered in the longitudinal direction and the transverse direction, and the distribution density is 6/cm²。

As shown in fig. 3, a device for producing a fiber dust-absorbing nonwoven fabric sequentially comprises, in the direction of material travel: the device comprises a flat screen spunlace unit 4, a drum spunlace unit 5, an oil removal cleaning unit 10, a moisture removal unit 6, a noise drying unit 7, an electret unit 8 and a coiling unit 9. Wherein:

the flat-wire hydroentangling unit comprises a cyclically rotating carrier web 41, a flat-wire hydroentangling head 42 directed towards the upper surface of the carrier web, and a vacuum suction device 43 directed towards the lower surface of the carrier web. The drum spunlace unit comprises a drum 51 and 2 drum spunlace heads 52 arranged on the outer side of the drum along the circumference; the surface of the rotary drum is provided with a plurality of salient points 53 with the height of 20 mm; the shape of the salient point corresponds to the shape of the cavity. The deoiling cleaning unit comprises a cleaning box 1001 and a cleaning spunlace head; an ultrasonic cleaning head 1002, 6 cloth guide rollers 11 and a heating plate 1003 are arranged in the cleaning box; a cleaning liquid 1004 is arranged in the cleaning box; the ultrasonic cleaning head 1002 is connected with an ultrasonic generator; the cleaning water stabs are positioned behind the cleaning box and in front of the moisture removing unit. The moisture removal unit is a vacuum extractor. The noise drying unit is a hot air penetration dryer.

As shown in fig. 4, the electret unit includes a housing 81, a high-voltage electrostatic generator 82, an electrostatic grounding guide roller group 83, and an electret plate 84. The high-voltage electrostatic generator is fixed on the shell, the electrostatic grounding cloth guide roller set is positioned in the shell, a cloth inlet 85 and a cloth outlet 86 are respectively formed in the two ends of the electrostatic grounding cloth guide roller set on the shell, the electret plate is fixed above the electrostatic grounding cloth guide roller set in the shell, and a plurality of high-voltage electrostatic emission needles 87 facing downwards are arranged on the electret plate; the electrostatic grounding cloth guide roller group is connected with the high-voltage electrostatic generator through a lead and is grounded; the electret plate is connected with the anode of the high-voltage electrostatic generator through a lead.

A method for preparing a fiber dust-absorption non-woven fabric, as shown in fig. 3 and 4, comprising the following steps:

1. opening and carding 3dtex polyamide and polyester bi-component orange petal type superfine fiber to prepare a fiber net, and then carrying out spunlace reinforcement and entanglement and fiber opening on the fiber to prepare a first fiber layer;

2. opening and carding 10dtex hollow polypropylene fibers to prepare a fiber web; then overlapping the coarse denier synthetic fiber net on the first fiber layer;

3. the laminated material is sent into a spunlace; firstly, adopting a flat screen to perform spunlace consolidation on a coarse denier synthetic fiber net and a first fiber layer, wherein the spunlace pressure is 90 kg; then sending the material into a drum spunlace machine, wherein the surface of the drum is provided with salient points, the shapes of the salient points are adapted to the shapes of the cavities, and the widths of the bottoms of the salient points are smaller than the widths of the upper parts of the salient points; the laminated material is adsorbed on the surface of the rotary drum, and the coarse denier synthetic fiber net is attached to the salient points; 2 water stabs are arranged on the outer side of the rotary drum along the circumference and are opposite to the surface of the first fiber layer; high-pressure water flow jetted from the rotary drum spunlace head firstly passes through the first fiber layer and then reaches the coarse denier synthetic fiber net, so that the fibers in the first fiber layer and the coarse denier synthetic fiber net are mutually entangled; under the impact of high-pressure water flow, the coarse denier synthetic fiber net is extruded and embedded into the salient points to form a cavity 3 corresponding to the shape of the salient points; the drum spunlace pressure is 80 kg;

4. cleaning the spunlaced material by using an ultrasonic degreaser, and removing redundant water by adopting a vacuum suction mode; drying the material by a hot air penetrating type dryer; the cleaning solution is ethanol.

5. Feeding the material subjected to noise drying into an electret unit, and applying charges on the material; and then the materials are coiled and packaged to prepare the fiber dust absorption non-woven fabric.

COMPARATIVE EXAMPLE 1 (without Cavity)

A fiber dust-absorption non-woven fabric with the mass per unit area of 65g/m². Comprises a first fiber layer and a second fiber layer which are mutually overlapped and connected; the first fiber layer is formed by mutually intertwining 2dtex polyamide and polyester bi-component orange-petal type superfine fibers, the length is 38mm, and the fineness after fiber opening is 0.3 dtex; the second fiber layer is composed of 8dtex thick denier fiber, the length is 38mm, and the crimpness is 10/piece/25 mm; elongated protrusions are distributed on the surface of the second fiber layer; the strip-shaped bulges are arranged in parallel; the fibers of the first fiber layer and the second fiber layer are charged.

Comparative example 2 (no electric charge)

A fiber dust-absorption non-woven fabric with the mass per unit area of 65g/m². Comparative example 2 differs from example 2 in that the material was not subjected to finish washing and electret treatment, and the fibers of the first fiber layer and the second fiber layer did not carry electric charges.

Comparative example 3 (no degreaser clean, charged)

A fiber dust-absorption non-woven fabric with the mass per unit area of 65g/m². Comparative example 3 differs from example 2 in that the material was not subjected to finish cleaning, but to electret treatment, and the fibers of the first fiber layer and the second fiber layer were charged.

Cleaning performance test comparative evaluation 1: dust lock amount test

(1) Preparing materials: preparing fine dust with more than 200 meshes; cutting 5 test sheets with a circular shape and an area of 100cm²；

(2) Test equipment: preparing a mass balance with the precision of 0.001 g; and (5) vibrating a frame.

(3) The test steps are as follows: firstly, weighing a sample to be detected, and recording the sample as a; flatly paving a sample to be tested on a test bed, weighing 0.5g of fine dust, uniformly scattering the fine dust on the surface of the sample, placing the sample on a shaking frame according to the original orientation, and vibrating for 5 seconds; after completion, the sample was turned upside down with the dust side facing down, placed on a vibration stand, shaken for 5 seconds, and after completion, the weight of the sample was weighed and recorded as b.

And (3) calculating the dust locking amount:

dust locking amount (100 cm)²) A to b, eachSample data were averaged over five groups

Dust locking amount performance test data comparison table

Item	Gram weight (g/m)2)	Dust locking amount (g/100 cm)2)	Characteristic of the technology
				Example 1	35	0.236	Cavity, electret
Example 2	65	0.345	Cavity, electret
				Example 3	100	0.278	Cavity, electret
Comparative example 1	65	0.154	A bulge, an electret,
				Comparative example 2	65	0.135	Hollow cavity

And (3) analyzing a test result:

(1) as can be seen from the table, the dust locking performance of the products of example 1, example 2 and example 3 is greatly improved compared with the products of comparative example 1 and comparative example 2. The synergistic effect of the two technical characteristics of the cavity and the electret is particularly remarkable in effect of improving the dust locking performance of the cleaning material;

(2) as can be seen from the above table, at the same grammage (65 g/m)²) In the following, the dust holding capacity of the material of the invention is improved by 124% in example 2 compared with that of comparative example 1, which shows that the arrangement of the small-opening and large-space cavity structure has greater advantages in dust holding capacity for fine dust compared with the common convex appearance material, and the dust locking effect is obvious;

(3) as can be seen from the above table, at the same grammage (65 g/m)²) Next, example 2 is increased by 155% compared to comparative example 2. The arrangement of the electret static electricity in the invention can ensure that fine dust is attached to the interior of the material more firmly and is not easy to separate, thereby better playing the role of dust locking.

Cleaning performance test comparative evaluation 2: dust pick-up test

(1) Preparing materials: preparing fine dust with more than 200 meshes; cutting 5 test sheets with a circular shape and an area of 100cm²；

(2) Test equipment: preparing a mass balance with the precision of 0.001 g;

(3) the test steps are as follows: firstly, weighing a sample to be detected, and marking as a; 0.5g of dust is weighed and spread on a 100cm flat bed²Round smooth ground; freely covering the sample to be detected on dust with the front surface facing downwards; dragging one corner of the cloth cover to move horizontally for 10 times, so that the cloth cover can actively adsorb and capture dust without applying pressure.

(4) And (3) dust absorption amount calculation:

dust absorption capacity (100 cm)²) Data for each sample are averaged over five groups

Dust absorption capacity performance test data comparison table

Item	Gram weight (g/m)2)	Dust absorption capacity (g/100 cm)2)	Characteristic of the technology
				Example 1	35	0.143	Cavity, electret
Example 2	65	0.157	Cavity, electret
				Example 3	100	0.152	Cavity, electret
Comparative example 1	65	0.098	A bulge, an electret,
				Comparative example 2	65	0.032	Hollow cavity

And (3) analyzing a test result:

(1) as can be seen from the table, the dust absorption performance of the products of the examples 1, 2 and 3 is obviously improved compared with the products of the comparative examples 1 and 2. The synergistic effect of the two technical characteristics of the cavity and the electret is shown, and the improvement on the dust absorption performance of the cleaning material is remarkable;

(2) as can be seen from the above table, at the same grammage (65 g/m)²) In the following, the embodiment 2 is improved by 60.2% compared with the comparative example 1, which shows that the arrangement of the surface cavity has certain advantages in dust absorption capability to fine dust compared with the common appearance material, and the dust absorption effect is obvious;

(3) as can be seen from the above table, at the same grammage (65 g/m)²) Next, example 2 is improved by 390.6% over comparative example 2. The material after electret treatment is electrostatic, can actively adsorb fine dust, and has larger dust absorption amount than that of a non-electret material.

Comparison and evaluation of non-woven fabric charge: surface potential test

(1) Preparing materials: example 2 and comparative example 3 nonwoven fabrics

(2) Test equipment: FMX-003 model SIMCO CORPORATION HAND-HELD STATIC ELECTRICITY TESTER

(3) The test method comprises the following steps: cutting a test sample from the two non-woven fabrics of example 2 and comparative example 3 according to the size of 25 x 25 cm; a nine-square method is adopted on the cloth surface of each non-woven fabric, a hand-held static tester is used for testing 9 points on the surface of the non-woven fabric to obtain an average value, and the same fabric sample is tested for 5 pieces to obtain the average value. And placing the tested cloth sample in a standard environment box with the temperature of 20 ℃ and the humidity of 65%, taking out every 10 days, testing the surface potential value according to the same method, and recording. The surface potential of the two nonwovens as a function of time was tested and shown in FIG. 5.

Charged quantity performance test data comparison table

Item	Gram weight (g/m)2)	Initial surface potential (kV)	Surface potential (kV) for 50 days	Characteristic of the technology
					Example 2	65	6.7	4.56	Electret, degreaser cleaning
Comparative example 3	65	5.5	1.2	Electret non-degreaser

And (3) analyzing a test result:

as can be seen from the above graph, at the same grammage (65 g/m)²) In the following, the initial surface potential of the product of example 2 was increased by 21.8% compared to that of comparative example 3, and with increasing time, the surface potential of the final material tested after 50 days was increased by 280% compared to that of comparative example 3 in example 2. The oil agent for cleaning the fiber surface plays an important role in enabling the charges in the electrostatic field to reside on the surface of the synthetic fiber under the same condition, greatly improves the electrostatic electret effect of the non-woven fabric, reduces the conductivity of the fiber, and effectively delays the attenuation and loss of the charges stored in the synthetic fiber.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still belong to the protection scope of the technical solution of the present invention.