阅读说明：本技术 一种功能性无纺复合材料及制备方法 (Functional non-woven composite material and preparation method thereof ) 是由 佘卫军 刘维国 姚正其 于 2020-11-20 设计创作，主要内容包括：本发明涉及非织造材料领域,公开了一种功能性无纺复合材料及制备方法,该材料包括相互叠合连接的功能层1和基础层2。其中基础层为纤维网；功能层为固定于基础层表面的功能性材料,功能性材料为功能性纤维、功能性微片材的一种或多种组合；功能层的质量小于基础层的质量。本发明方法可实现将具有特殊性能的功能性材料直接用于干法非织造材料中,该制备方法简单、高效、实用,不受成网系统的限制。本发明所得功能性无纺复合材料,为层状结构,其中功能层中直接采用功能性纤维、功能性微片材等功能性材料,能够充分保留功能性物质的有效成分,充分发挥其功能性的作用。(The invention relates to the field of non-woven materials, and discloses a functional non-woven composite material and a preparation method thereof, wherein the functional non-woven composite material comprises a functional layer 1 and a basic layer 2 which are mutually overlapped and connected. Wherein the base layer is a fibrous web; the functional layer is a functional material fixed on the surface of the base layer, and the functional material is one or a combination of functional fibers and functional micro-sheets; the mass of the functional layer is less than the mass of the base layer. The method can realize that the functional material with special performance is directly used in the dry-method non-woven material, and the preparation method is simple, efficient and practical and is not limited by a net forming system. The functional non-woven composite material obtained by the invention is of a layered structure, wherein functional materials such as functional fibers and functional micro-sheets are directly adopted in the functional layer, so that the effective components of the functional substances can be fully reserved, and the functional function of the functional substances can be fully exerted.)

1. A functional nonwoven composite characterized by: comprises a functional layer (1) and a basic layer (2) which are mutually overlapped and connected; the base layer is a fiber mesh; the functional layer is a functional material fixed on the surface of the base layer, and the functional material is one or more combinations of functional fibers and functional micro-sheets; the mass of the functional layer is less than the mass of the base layer.

2. The functional nonwoven composite of claim 1 wherein:

the functional fiber comprises one or more of natural fiber, regenerated fiber and synthetic fiber; the average length of the functional fiber is 2-15 mm;

the functional micro-sheet is a natural plant sheet, the length is less than or equal to 13mm, the width is less than or equal to 4mm, the thickness is less than or equal to 0.2mm, and the length-width ratio is less than or equal to 10: 1;

the fibers in the fiber web are one or more of natural fibers, regenerated fibers and synthetic fibers which are different from the functional fibers; the linear density of the fibers in the fiber web is 0.5-8 dtex; the length is 25-60 mm.

3. The functional nonwoven composite of claim 1 wherein: the functional layer accounts for 0.5-30% of the total mass of the functional nonwoven composite material.

4. A method for preparing a functional nonwoven composite according to any of claims 1 to 3, characterized in that it comprises the following steps:

(1) preparation of the base layer: pre-wetting the fiber net, and then conveying the wet fiber net to a net supporting curtain;

(2) preparation of the functional layer: adding water into the functional material, and stirring until the functional material is uniformly dispersed; adding thickening agent-containing thickening liquid and water, and stirring to prepare working solution; the working liquid is sent into a distributor, and then the working liquid is sent into a liquid applying head by the distributor;

(3) application of the functional layer: the working solution is sprayed out from a slit on the solution applying head, the working solution is uniformly applied to the wet fiber net on the net supporting curtain along the width direction, and the functional material in the working solution is superposed on the wet fiber net to obtain the composite fiber net; pumping and recovering redundant thickening fluid in the working fluid in vacuum;

(4) material compounding and reinforcing: carrying out multiple spunlacing on the front surface and the back surface of the composite fiber web, so that fibers are entangled with each other, solidifying the functional material onto the wet fiber web, and removing the thickening liquid remained in the fiber web;

(5) and (4) removing excessive water in the composite fiber web obtained in the step (4), drying and rolling to obtain a finished product.

5. The method of claim 4, wherein:

in the step (2), the thickening agent is polyacrylamide; the content of polyacrylamide in the working solution is less than or equal to 0.15 wt%; the concentration of the functional material in the working solution is 0.05-3%; the viscosity of the working solution is controlled to be 0.1-15 mPa & s; the surface tension of the working solution is 30-40 mN/m;

in the step (4), the front side spunlace is firstly carried out, and then the back side spunlace is carried out.

6. The method of claim 5, wherein: in the step (2), the concentration of the functional material in the working solution is 0.1-1%; the viscosity of the working fluid is controlled to be 0.3 to 5 mPas.

7. The method of claim 4, wherein: the preparation method is carried out by a functional non-woven composite material production device; the functional non-woven composite material production device sequentially comprises the following processing procedures: the device comprises a conveying unit, a liquid applying unit, a spunlace unit and a drying unit; a pre-wetting device is arranged on the conveying unit; the liquid applying unit is arranged behind the pre-wetting device;

the liquid applying unit comprises a material preparing kettle (201), a material storing kettle (202), a distributor (203), a liquid applying device and a liquid drawing device (205) arranged below the liquid applying device, wherein the material preparing kettle, the material storing kettle (202), the distributor (203) and the liquid applying device are sequentially connected through pipelines; the liquid applying device and the liquid extracting device are respectively positioned above and below the fiber net (3).

8. The method of claim 7, wherein: the liquid applying device comprises an air power mechanism (206) and a liquid applying head (207); a plurality of liquid inlets (208), a cavity (209) and a liquid outlet slit (210) with a downward oblique direction which are communicated are sequentially arranged in the liquid applying head from top to bottom; a gas buffer cavity (211) is also arranged in the liquid applying head; the aperture of the liquid inlet is larger than that of the liquid outlet slit, and the cavity is expanded relative to the liquid inlet and the liquid outlet slit; the gas inlet (212) of the gas buffer cavity is arranged on the side wall of the liquid applying head, a bottom gas outlet of a gas outlet slit (213) positioned at the bottom of the gas buffer cavity is communicated with a bottom liquid outlet of the liquid outlet slit in an intersecting manner to form a gas-liquid mixing slit (214), and the gas-liquid mixing slit is arranged at the bottom of the liquid applying head and faces downwards; the air power mechanism is communicated with the air inlet; the liquid inlet is communicated with the distributor.

9. The method of claim 8, wherein: the gap of the gas-liquid mixing slit is 1-7 mm.

10. The method of claim 7, wherein:

stirrers are arranged in the batching kettle and the material storage kettle; metering pumps (215) are respectively arranged on pipelines among the batching kettle, the storage kettle and the distributor;

the conveying unit comprises a circularly rotating net supporting curtain (101) and a plurality of guide rollers (102) for conveying the net supporting curtain;

the pre-wetting device comprises a pre-wetting head (103) and a vacuum suction device A (104) which are respectively and oppositely arranged on the upper side and the lower side of the net supporting curtain;

the spunlace unit comprises a flat-screen spunlace head (301) and a circular drum spunlace device (302) which are arranged in front and at the back; a vacuum suction device B (303) is arranged below the flat net water stabs through a net supporting curtain.

Technical Field

The invention relates to the field of non-woven materials, in particular to a functional non-woven composite material and a preparation method thereof.

Background

The non-woven fabric is a sheet formed by directly forming a net and consolidating fibers, and is a flexible, porous and stable fiber product prepared by mechanical entanglement, thermal bonding or chemical bonding or combination of multiple consolidation modes. Nonwoven fabrics may be made into fibrous structure composites by stitching or compounding with yarns, fabrics, and even films or other sheets. Due to different net forming modes and consolidation modes, the types, structures and compositions of the non-woven fabrics are complex and various. Common web forming methods include dry web forming, wet web forming, polymer extrusion web forming and the like. The common consolidation methods include mechanical consolidation, adhesive consolidation, thermal bonding, and the like.

The patent with application number 201920778947.3 discloses a conductive composite spunlace nonwoven fabric, which comprises a first waterproof moisture-permeable film layer, a first fiber assembly, a conductive reinforcing layer, a second fiber assembly and a second waterproof moisture-permeable film layer; the first fiber assembly, the conductive reinforcing layer and the second fiber assembly are fixed in a jet flow entanglement mode; the first waterproof moisture permeable film layer is compounded with the first fiber assembly, and the second waterproof moisture permeable film layer is compounded with the second fiber assembly; the conductive reinforcing layer is a chemical fiber filament woven fabric, and the chemical fiber filaments are coated with a conductive layer. The utility model discloses a conductive composite non-woven fabrics adopts the outer woven fabric that the chemical fibre filament that has the conducting layer weaves as electrically conductive enhancement layer to it has the fibrous layer to adopt water thorn reinforcement at two-layer, as the protection to electrically conductive enhancement layer. And the outermost side is compounded with a waterproof moisture permeable film, so that the non-woven fabric has a waterproof moisture permeable function, and the application range of the non-woven fabric is enlarged. The scheme has the defects of complex material structure, long processing flow and high cost.

The patent with the application number of 201910802714.7 discloses a high-temperature-resistant flame-retardant filter material and a preparation method thereof. The high-temperature flame-retardant filter material is formed by a sandwich-like structure, and the preparation process comprises the steps of core layer woven fabric preparation, surface layer non-woven fabric preparation, flame retardant preparation and functional finishing. The upper layer and the lower layer of the high-temperature flame-retardant filter material are non-woven layers, the core layer is a woven fabric layer, the high-temperature flame-retardant filter material is formed by compounding through needling or spunlace, and then the cyclic phosphate ester compound flame retardant is arranged on the filter material to obtain the high-temperature flame-retardant filter material. The scheme has the defects that the cyclic phosphate compound needs to be applied to the composite material through after-treatment, and the product has a complex structure, a long processing flow and high cost.

The dry-laid nonwoven fabric refers to a nonwoven fabric with fibers in a dry state formed into a fiber web by carding, air flow or other web forming methods, and the dry-laid nonwoven fabric is the most widely applied and longest-history processing method in the nonwoven fabric. In some specific fields, in order to achieve specific functional requirements, some functional fibers with specific physical and chemical properties are sometimes used in dry-process nonwoven materials, and most of the fibers have specific structural characteristics, morphological characteristics (such as length, fineness, crimpness, cross-sectional shape, elongation, etc.), hygroscopicity, mechanical properties, surface properties, and specific thermal, optical, and electrical properties.

Due to the limitations of dry-laid equipment (e.g., carding machines, air-laying machines, etc.), these special functional fibers have many problems in dry-laying, some of which are not directly usable and have some of an impact on production efficiency, resulting in limited development of some functional nonwoven materials. The specific reason is as follows: the functional fiber comprises superfine fiber with special specification and excellent touch feeling, modified fiber and fiber prepared by mixing and spinning with functional substance, and the process of adding function to the fiber can cause some changes in fiber fineness, fiber cross section, fiber modulus, color and the like. The clothing configuration and the gauge of the roller card determine the fibers suitable for carding, generally the fibers have a linear density of more than 1.0dtex and are suitable for carding by the roller card, and for the fibers with the linear density of less than 1.0dtex, the production is realized by reducing the production efficiency, and even the fibers cannot be produced. The grammage of the output web of the card also places demands on the card clothing and the gauge, generally speaking, too low a web grammage requires a higher cylinder tooth density, while the doffer clothing also requires easier fiber handling and a smaller cylinder-to-doffer gauge to effect web transfer. Generally, the card clothing configuration of the carding machine is unrealistic to change in actual production, and meanwhile, the adjustment of the gauge is not beneficial to the improvement of the production efficiency, so that the carding machine has certain limitations when processing superfine fibers, fibers with large fiber modulus difference and low-gram-weight fiber webs. In dry-laid technology, whether carded or air-laid, the fibers need to travel a long path before entering the web reinforcement, and individual fibers can remain in the system before the web reinforcement, which can have a very adverse effect on the processing of nonwoven products of different color fibers.

In addition, some functional materials such as functional micro-sheets and functional fiber aggregates cannot be directly used on dry-laid equipment due to different material forms, specifications and colors, and development and application of the functional fiber materials are affected.

In view of the above problems in the prior art, there is a need to develop a functional fiber nonwoven composite material and a preparation method thereof, which can directly adopt various functional materials, and has simple and efficient processing process, so as to meet the market demand.

Disclosure of Invention

In order to solve the technical problems, the invention provides a functional non-woven composite material and a preparation method thereof, the method can realize that the functional material with special performance is directly used in the dry non-woven material, and the preparation method is simple, efficient and practical and is not limited by a net forming system. The functional non-woven composite material obtained by the invention is of a layered structure, wherein functional materials such as functional fibers and functional micro-sheets are directly adopted in the functional layer, so that the effective components of the functional substances can be fully reserved, and the functional function of the functional substances can be fully exerted.

The specific technical scheme of the invention is as follows:

in a first aspect, the present invention provides a functional nonwoven composite material, comprising a functional layer and a base layer which are laminated and connected with each other; the base layer is a fiber mesh; the functional layer is a functional material fixed on the surface of the base layer, and the functional material is one or more combinations of functional fibers and functional micro-sheets; the mass of the functional layer is less than the mass of the base layer.

Preferably, the fiber web is a short fiber web, and further, the short fiber web is a dry fiber web, that is, a fiber web produced by a dry-laid method.

Preferably, the web is a filament web.

Preferably, the functional fiber comprises one or more of natural fiber, regenerated fiber and synthetic fiber; the average length of the functional fiber is 2-15 mm; more preferably 3 to 8 mm.

Preferably, when the functional fiber is a natural fiber, the average length of the natural fiber is less than or equal to 4 mm;

we found by study that fibres below 3mm are easy to penetrate into the web and fibres above 8mm are not conducive to dispersion in water. Natural fibers are generally evaluated for their average length due to their greater randomness in length. In practice, natural fibers with an average length of more than or equal to 5mm are found to be not smooth when dispersed in water, so that the natural fibers with an average length of less than or equal to 4mm are selected.

Preferably, the functional micro-sheet is a natural plant sheet (such as natural petals) with a length of less than or equal to 13mm, a width of less than or equal to 4mm, a thickness of less than or equal to 0.2mm and an aspect ratio of less than or equal to 10: 1.

The product of the invention is a functional flexible fiber composite material, and because the material thickness is thin, if the thickness of the micro-sheet is too large, the micro-sheet can protrude out of the surface of the material, and the fixation of the micro-sheet in the material is influenced. We have found that the above situation can be avoided by selecting the thickness of the micro-sheet to be less than or equal to 0.2 mm. It has also been found that a micro-sheet having a length to width ratio of too great a length to width ratio is detrimental to its dispersion in water, and that a micro-sheet having a length to width ratio of less than 10 is effective in avoiding the above problems.

Preferably, the fibers in the fiber web are one or more of natural fibers, regenerated fibers and synthetic fibers which are different from the functional fibers; the linear density of the fibers in the fiber web is 0.5-8 dtex; further 1.0 to 2.5 dtex; the length is 25 to 60mm, and further 32 to 51 mm.

Preferably, the functional layer accounts for 0.5-30% of the total mass of the functional nonwoven composite material.

Since the functional material contains fibers and/or functional micro-sheets, it is found that if the ratio is too high, the functional material is not easily applied to the surface of the base layer, and thus the content is limited to the above preferred range.

In a second aspect, the present invention provides a method for preparing a functional nonwoven composite material, comprising the steps of:

(1) preparation of the base layer: the dry fiber web is pre-wetted and the wet fiber web is fed onto the web supporting curtain.

The reason why the fiber web of the base layer is subjected to the pre-wetting in the above step (1) is that: the prewetting of the fibrous web removes air from the fibrous web, making the web more compact and able to withstand the impact of the working fluid during application of the functional layer.

(2) Preparation of the functional layer: adding water into the functional material, and stirring until the functional material is uniformly dispersed; adding thickening agent-containing thickening liquid and water, and stirring to prepare working solution; the working liquid is sent into the distributor, and then the working liquid is sent into the liquid applying head by the distributor.

(3) Application of the functional layer: the working solution is sprayed out from a slit on the solution applying head, the working solution is uniformly applied to the wet fiber net on the net supporting curtain along the width direction, and the functional material in the working solution is superposed on the wet fiber net to obtain the composite fiber net; and (4) sucking and recovering redundant thickening fluid in the working fluid in vacuum.

(4) Material compounding and reinforcing: and carrying out multiple spunlacing on the front surface and the back surface of the composite fiber web, so that fibers are entangled with each other, the functional material is solidified on the wet fiber web, and the thickening liquid remained in the fiber web is removed.

(5) And (4) removing excessive moisture in the composite fiber web obtained in the step (4), drying and rolling to obtain the functional non-woven composite material.

Preferably, in step (2), the thickener is polyacrylamide.

Polyacrylamide is a water treatment flocculant that is used in the preparation of nonwoven materials to effectively complex functional layers with base layers by virtue of its thickening, drag reducing, and shear resistance properties (i.e., no viscosity change at higher agitation speeds). In addition, polyacrylamide is non-toxic, can be used for drinking water treatment, and is more suitable for being used in spunlace non-woven processing.

Further preferably, the content of the polyacrylamide in the working solution is less than or equal to 0.15 wt%; the concentration of the functional material in the working solution is 0.05-3%.

The research personnel of the invention find that if the content of the polyacrylamide in the working solution is too high, the polyacrylamide can be caused to remain in the composite material. Experimental research shows that when the addition amount of the polyacrylamide in the working solution is less than 0.15 per mill, the polyacrylamide in the composite material can completely enter a water treatment system after being subjected to spunlace processing, and cannot remain in the composite material.

More preferably, the viscosity of the working fluid is controlled to 0.1 to 15 mPas (more preferably 0.3 to 5 mPas); the surface tension of the working solution is 30-40 mN/m.

We find that improving the viscosity of the working solution is beneficial to preventing fiber flocculation and controlling the stability of the working solution, and the viscosity of the working solution is adjusted according to different raw materials in the production process, so that the working solution is preferably kept stand for 3min without obvious layering.

We controlled the surface tension of the working solution between 30 and 40mN/m, because we found that: the lower surface tension can reduce the shrinkage effect of the boundary of the water curtain, and the stability and the evenness of the edge part of the water curtain can be improved by adding a proper amount of surfactant.

Preferably, in the step (2), the concentration of the functional material in the working solution is 0.1-1%; .

The concentration of functional material should be adjusted to the material specification, with the average length of functional material having the greatest effect and the longer the length of material the lower the concentration of functional material.

Preferably, in step (4), the front-side spunlace is performed first, and then the back-side spunlace is performed.

Preferably, the preparation method is carried out by a functional non-woven composite material production device; the functional non-woven composite material production device sequentially comprises the following processing procedures: the device comprises a conveying unit, a liquid applying unit, a spunlace unit and a drying unit; a pre-wetting device is arranged on the conveying unit; the liquid applying unit is arranged behind the pre-wetting device.

The liquid applying unit comprises a batching kettle, a storage kettle, a distributor, a liquid applying device and a liquid drawing device arranged below the liquid applying device, wherein the batching kettle, the storage kettle, the distributor and the liquid applying device are sequentially connected through pipelines; the liquid applying device and the liquid extracting device are respectively positioned above and below the fiber web.

Preferably, the liquid applying device comprises an air power mechanism and a liquid applying head; a plurality of liquid inlets, a cavity and a liquid outlet slit with an oblique downward direction which are communicated are sequentially arranged in the liquid applying head from top to bottom; a gas buffer cavity is also arranged in the liquid applying head; the aperture of the liquid inlet is larger than that of the liquid outlet slit, and the cavity is expanded relative to the liquid inlet and the liquid outlet slit; the gas inlet of the gas buffer cavity is arranged on the side wall of the liquid applying head, a bottom gas outlet of a gas outlet slit positioned at the bottom of the gas buffer cavity is communicated with a bottom liquid outlet of a liquid outlet slit in an intersecting manner to form a gas-liquid mixing slit, and the gas-liquid mixing slit is arranged at the bottom of the liquid applying head and faces downwards; the air power mechanism is communicated with the air inlet; the liquid inlet is communicated with the distributor.

According to the invention, the mixed liquid containing the functional material is uniformly applied to the wet fiber web through the liquid applying head in the liquid applying unit, and the functional material is solidified on the surface of the fiber web through the procedures of spunlace reinforcement and the like. In the technical scheme, the batching kettle is used for uniformly dispersing the functional material; the main function of the material storage kettle is to prevent functional materials in the working solution from flocculating; the distributor has the main functions of scattering the flocculent fiber mass which possibly appears and supplying working liquid to the liquid applying device; the main function of the liquid applying device is to apply the working liquid to the fiber web and to carry out process control on the liquid applying process.

The air power mechanism is arranged on one side of the lower part of the liquid applying head, provides driving force for spraying the working liquid through an air inlet on the liquid applying head, and stabilizes the uniformity of the functional material in the width direction by using air flow.

The liquid applying device is specially designed according to the property of the working liquid and has the following characteristics:

(1) the liquid applying head is provided with a plurality of liquid inlets which are communicated and connected in parallel, and the aim is to uniformly distribute the working liquid in the liquid applying head in a multipoint feeding mode, so that the functional materials are uniformly and transversely distributed in the fiber web.

(2) The liquid applying head is provided with a cavity and a liquid outlet slit with an oblique downward direction; the aperture of the liquid inlet is larger than that of the liquid outlet slit. The purpose of adopting this design is: the working solution contains functional materials and has certain viscosity, and after entering the liquid applying head from the liquid inlet, the liquid outlet slit with the oblique downward direction is beneficial to the flowing of the working solution; the caliber of the liquid inlet is larger than that of the liquid outlet slit, so that the fluid pressure at the liquid outlet slit below can be increased, and the working liquid can be conveniently and quickly sprayed out.

The liquid applying head is provided with the cavity, and the cavity is expanded relative to the liquid inlet and the liquid outlet slit, so that the fluid pressure at the liquid outlet slit can be increased by adopting the design, and the working liquid can be conveniently and quickly sprayed out; meanwhile, the cavity with large volume can contain more working solution, so that the functional materials in the working solution can be further uniformly mixed in the cavity, and the distribution uniformity of the functional materials is improved.

(3) Because the working solution contains the functional material and has certain viscosity, in order to prevent the functional material from being adhered to the liquid outlet and influencing the outflow of the working solution, the air power mechanism is particularly arranged at the lower part of the liquid applying device, and the invention aims to utilize the action of air power to push the working solution to be quickly sprayed out from the liquid outlet, avoid the functional material from being adhered to the inner wall of the slit, ensure the smooth application of the functional material and stabilize the uniformity of the functional material.

Preferably, the width of the mixing slit gap is 1 to 7 mm.

The working solution contains solid functional materials, so the width of the slit opening needs to consider the specification factor of the functional materials, the outflow of the functional materials is blocked when the width is too small, and the accumulation of the functional materials is caused when the width is too large, thereby influencing the normal production. After the internal structure of the liquid applying device is determined, the width of the liquid outlet slit is not adjustable, and the width of the liquid outlet slit is far larger than the thickness and the width of the applied functional material, so that the slit is prevented from being too small to block the outflow of the functional material. The liquid applying part controls the applying amount of the functional fiber material only through a metering pump, and the uniformity control in the width direction is controlled through air flow.

Preferably, a stirrer is arranged in the batching kettle and the storage kettle; and metering pumps are respectively arranged on pipelines among the batching kettle, the storage kettle and the distributor.

Preferably, the bottom of the storage kettle is provided with a screen with the aperture ratio of 50%, and an impeller is arranged above the screen. The working liquid is input from the lower part of the distributor through the metering pump and then output to the liquid applying head from the upper part of the distributor.

In the invention, the working solution is pumped out from the lower part of the storage kettle through the metering pump and enters the distributor from the lower part, wherein the bottom of the storage kettle is provided with a screen with the aperture ratio of 50 percent, an impeller is arranged above the screen and is used for scattering flocculated fiber clusters, the uniformity of the working solution in the storage kettle is kept, and the distance between the impeller and the screen can be adjusted according to the quality of the working solution.

The working liquid enters the distributor from the lower part of the distributor and is output to the liquid applying head through the overflow pipe on the upper part of the distributor, wherein the overflow pipe distributed on the upper part of the distributor can ensure the consistent flow; the overflow pipe flow is controlled by a metering pump.

Preferably, the conveying unit comprises a circularly rotating web supporting curtain and a plurality of guide rollers for conveying the web supporting curtain.

Preferably, the pre-wetting device comprises a pre-wetting head and a vacuum suction device A which are respectively and oppositely arranged on the upper side and the lower side of the net supporting curtain.

Preferably, the spunlace unit comprises a flat-screen spunlace head and a round drum spunlace device which are arranged in front and behind; a vacuum suction device B is arranged below the flat net water stabs through a net supporting curtain.

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

(1) the product of the invention is a laminated structure, wherein functional materials such as functional fibers, functional micro-sheets and the like are directly adopted in the functional layer. The scheme can fully retain the effective components of the functional substances, fully exert the functions of the functional substances, and solve the problem that some special functional substances cannot be directly used in the prior art.

(2) The functional layer of the product adopts a system taking water as dispersion liquid, functional materials are uniformly dispersed in the water, various functional materials are applied to the surface of the basic layer through a special liquid applying unit, and the functional materials are compounded with the textile fiber net in a spunlace reinforcing mode. The preparation method is simple, efficient and practical, is not limited by a net forming system, can be used for adding various functional materials to the base layer independently or in combination, and has flexible process change and wide application range.

(3) The production device of the functional non-woven composite material has the advantages of reasonable structure, complete functions, simple operation and strong practicability.

Drawings

FIG. 1 is a schematic structural view of a functional fiber nonwoven composite of example 1;

FIG. 2 is a schematic view showing the connection of a functional fiber nonwoven composite production apparatus according to example 1;

FIG. 3 is a schematic side sectional view of a liquid applying head according to embodiment 1;

fig. 4 is a schematic front view of a liquid application head according to embodiment 1.

The reference signs are: the multifunctional spunlace device comprises a functional layer 1, a base layer 2, a fiber web 3, a supporting screen 101, a guide roller 102, a pre-wetting head 103, a vacuum suction device A104, a batching kettle 201, a storage kettle 202, a distributor 203, a liquid pumping device 205, an aerodynamic mechanism 206, a liquid applying head 207, a liquid inlet 208, a cavity 209, a slit opening 210, an air buffer cavity 211, an air inlet 212, an air outlet 213, an air-liquid mixing slit 214, a metering pump 215, a flat screen spunlace head 301, a circular drum spunlace device 302 and a vacuum suction device B303.

Detailed Description

The present invention will be further described with reference to the following examples.

General examples

A functional nonwoven composite material, as shown in figure 1, comprises a functional layer 1 and a base layer 2 which are laminated and connected with each other; the base layer is a fiber mesh; the functional layer is a functional material fixed on the surface of the base layer, and the functional material is one or more combinations of functional fibers and functional micro-sheets; the mass of the functional layer is less than that of the basic layer (preferably, the functional layer accounts for 0.5-30% of the total mass of the functional non-woven composite material).

Wherein:

preferably, the fiber web is a short fiber web, further, the short fiber web is a dry fiber web; preferably, the web is a filament web.

The textile fibers in the fiber web are one or more of natural fibers, regenerated fibers and synthetic fibers which are different from the functional fibers; the linear density of the fibers in the fiber web is 0.5-8 dtex; further 1.0 to 2.5 dtex; the length is 25-60 mm. Further 32 to 51 mm.

The functional fiber comprises one or more of natural fiber, regenerated fiber and synthetic fiber; the average length of the functional fiber is 2-15 mm. Further preferably 3-8 mm; when the fiber is natural fiber, the average length is less than or equal to 4 mm.

The functional micro-sheet is a natural plant sheet, the length is less than or equal to 13mm, the width is less than or equal to 4mm, the thickness is less than or equal to 0.2mm, and the length-width ratio is less than or equal to 10: 1.

A functional nonwoven composite production device, as shown in fig. 2, comprising the following processing steps in sequence: the device comprises a conveying unit, a liquid applying unit, a spunlace unit and a drying unit; a pre-wetting device is arranged on the conveying unit; the liquid applying unit is arranged behind the pre-wetting device.

Wherein:

the conveying unit comprises a circularly rotating net supporting curtain 101 and a plurality of guide rollers 102 for conveying the net supporting curtain; the pre-wetting device comprises a pre-wetting head 103 and a vacuum suction device A104 which are respectively and oppositely arranged on the upper side and the lower side of the net supporting curtain.

The liquid applying unit comprises a batching kettle 201, a storage kettle 202, a distributor 203, a liquid applying device and a liquid drawing device 205 arranged below the liquid applying device, wherein the batching kettle 201, the storage kettle 202, the distributor 203 and the liquid applying device are sequentially connected through pipelines; the liquid applying device and the liquid extracting device are respectively positioned above and below the fiber net 3. Stirrers are arranged in the batching kettle and the material storage kettle; the bottom of the storage kettle is provided with a screen with the aperture ratio of 50 percent and an impeller above the screen. And metering pumps 215 are respectively arranged on pipelines among the batching kettle, the material storage kettle and the distributor. The working liquid is input from the lower part of the distributor through the metering pump and then output to the liquid applying head of the liquid applying device from the upper part of the distributor.

The liquid application device comprises an aerodynamic mechanism 206 and a liquid application head 207. As shown in fig. 3-4, a plurality of liquid inlets 208, a cavity 209 and a liquid outlet slit 210 with a downward direction are sequentially arranged in the liquid applying head from top to bottom; a gas buffer cavity 211 is also arranged in the liquid applying head; the aperture of the liquid inlet is larger than that of the liquid outlet slit, and the cavity is expanded relative to the liquid inlet and the liquid outlet slit; 8 gas inlets 212 of the gas buffer cavity are arranged on the side wall of the liquid applying head, a bottom gas outlet of a gas outlet slit 213 positioned at the bottom of the gas buffer cavity is communicated with a bottom liquid outlet of the liquid outlet slit in an intersecting manner to form a gas-liquid mixing slit 214, and the gas-liquid mixing slit is arranged at the bottom of the liquid applying head and faces downwards; the air power mechanism is communicated with the air inlet; the liquid inlet is communicated with the distributor.

The spunlace unit comprises a flat-screen spunlace head 301 and a round drum spunlace device 302 which are arranged in front and back; a vacuum suction device B303 is arranged below the flat net water stabs through a net supporting curtain.

A method for preparing a functional nonwoven composite material comprises the following steps:

(1) preparation of the base layer: the fiber net is pre-wetted and then the wet fiber net is sent to the net supporting curtain.

(2) Preparation of the functional layer: adding water into the functional material, and stirring until the functional material is uniformly dispersed; adding thickening agent (polyacrylamide) and water, stirring to obtain working solution (the content of polyacrylamide is less than or equal to 0.15 wt%, the concentration of the functional material is 0.05-3% (more preferably 0.1-1%), and the viscosity of the working solution is controlled to be 0.1-15 mPa & s (more preferably 0.3-5 mPa & s)); the working liquid is sent into the distributor, and then the working liquid is sent into the liquid applying head by the distributor.

(3) Application of the functional layer: the working solution is sprayed out from a gas-liquid mixing slit on the solution applying head, the working solution is uniformly applied to a wet fiber net on a net supporting curtain along the width direction, and functional materials in the working solution are superposed on the wet fiber net to obtain a composite fiber net; and (4) sucking and recovering redundant thickening fluid in the working fluid in vacuum.

(4) Material compounding and reinforcing: and carrying out multiple spunlacing on the front surface and the back surface of the composite fiber web, so that fibers are entangled with each other, the functional material is solidified on the wet fiber web, and the thickening liquid remained in the fiber web is removed.

(5) And (4) removing excessive water in the composite fiber web obtained in the step (4), drying and rolling to obtain a finished product.

Example 1

The flame-retardant non-woven composite material has the mass per unit area of 75 grams per square meter. As shown in fig. 1, comprises a functional layer 1 and a basic layer 2 which are connected with each other in an overlapped mode; the base layer is a dry-process textile fiber net; the functional layer is a functional material (flame-retardant viscose fiber) fixed on the surface of the base layer; the functional layer accounts for 15% of the total mass of the nonwoven composite. The length of the flame-retardant viscose fiber is 8 mm; the dry textile fiber web was made of 100% polyester fibers, with a fiber linear density of 1.67dtex and a fiber length of 38 mm.

As shown in fig. 2, a production apparatus for flame-retardant nonwoven composite material comprises the following processing steps in sequence: the device comprises a conveying unit, a liquid applying unit, a spunlace unit and a drying unit; a pre-wetting device is arranged on the conveying unit; the liquid applying unit is arranged behind the pre-wetting device.

Wherein:

the conveying unit comprises a circularly rotating net supporting curtain 101 and five guide rollers 102 for conveying the net supporting curtain; the pre-wetting device comprises a pre-wetting head 103 and a vacuum suction device A104 which are respectively and oppositely arranged on the upper side and the lower side of the net supporting curtain.

The liquid applying unit comprises a batching kettle 201, a storage kettle 202, a distributor 203, a liquid applying device and a liquid drawing device 205 arranged below the liquid applying device, wherein the batching kettle 201, the storage kettle 202, the distributor 203 and the liquid applying device are sequentially connected through pipelines; the liquid applying device and the liquid extracting device are respectively positioned above and below the fiber net 3. Stirrers are arranged in the batching kettle and the material storage kettle; the bottom of the storage kettle is provided with a screen with the aperture ratio of 50 percent and an impeller above the screen. And metering pumps 215 are respectively arranged on pipelines among the batching kettle, the material storage kettle and the distributor. The working liquid is input from the lower part of the distributor through the metering pump and then output to the liquid applying head of the liquid applying device from the upper part of the distributor.

The liquid application device comprises an aerodynamic mechanism 206 and a liquid application head 207. As shown in fig. 3-4, a plurality of liquid inlets 208, a cavity 209 and a liquid outlet slit 210 with a downward direction are sequentially arranged in the liquid applying head from top to bottom; a gas buffer cavity 211 is also arranged in the liquid applying head; the aperture of the liquid inlet is larger than that of the liquid outlet slit, and the cavity is expanded relative to the liquid inlet and the liquid outlet slit; 8 gas inlets 212 of the gas buffer cavity are arranged on the side wall of the liquid applying head, a bottom gas outlet of a gas outlet slit 213 positioned at the bottom of the gas buffer cavity is communicated with a bottom liquid outlet of the liquid outlet slit in an intersecting manner to form a gas-liquid mixing slit 214 (the width is 4 mm), and the gas-liquid mixing slit is arranged at the bottom of the liquid applying head and faces downwards; the air power mechanism is communicated with the air inlet; the liquid inlet is communicated with the distributor.

The spunlace unit comprises two groups of flat screen spunlace heads 301 and a circular drum spunlace device 302 which are arranged in front and back; a vacuum suction device B303 is arranged below the flat net water stabs through a net supporting curtain.

A preparation method of a flame-retardant non-woven composite material comprises the following steps:

(1) preparation of the base layer: opening and mixing textile fibers (polyester fibers), sending the textile fibers into a carding machine or an air-laid machine to prepare a dry textile fiber net, prewetting the dry textile fiber net, and sending the obtained wet textile fiber net onto a net supporting curtain.

(2) Preparation of the functional layer: adding water into the functional material (flame-retardant viscose fiber) and stirring until the functional material is uniformly dispersed; adding thickening agent (polyacrylamide) and water, and stirring to obtain working solution (the concentration of the functional material is 1%, the viscosity of the working solution is controlled to be 5mPa & s, and the surface tension is controlled to be 30-40 mN/m); the working liquid is sent into the distributor, and then the working liquid is sent into the liquid applying head by the distributor.

(3) Application of the functional layer: the working solution is sprayed out from a gas-liquid mixing slit on the liquid applying head, the working solution is uniformly applied to a wet textile fiber net on a net supporting curtain along the width direction, and functional materials in the working solution are superposed on the wet textile fiber net to obtain a composite fiber net; and (4) sucking and recovering redundant thickening fluid in the working fluid in vacuum.

(4) Material compounding and reinforcing: and carrying out multiple spunlacing on the front surface and the back surface of the composite fiber web to enable the fibers to be mutually entangled, solidifying the functional material on the wet textile fiber web, and removing the thickening liquid remained in the fiber web.

(5) And (4) removing excessive water in the composite fiber web obtained in the step (4), drying and rolling to obtain a finished product.

And (3) comparison shows that:

the common dry carding machine can only process common textile short fibers, and the technical indexes of fiber with special functions such as 'flame-retardant viscose fiber' and the like are obviously changed after functional processing, such as breaking strength, moisture regain, crimp rate and the like. When the functional fiber is processed on a dry carding machine, the problems of poor uniformity, more flying, serious cotton winding and the like of a fiber web are often generated, and the normal production of products is influenced. Ultra-short fibers with a length of less than 20 cm cannot be processed on a carding machine. Therefore, the "flame retardant nonwoven composite" in example 1 has a practical problem that it cannot be produced by a carding and hydroentangling process.

Example 2

The fine and smooth super-soft non-woven composite material has a mass per unit area of 50 g/square meter. As shown in fig. 1, comprises a functional layer 1 and a basic layer 2 which are connected with each other in an overlapped mode; the base layer is a dry-process textile fiber net; the functional layer is a functional material (fine denier viscose fiber) fixed on the surface of the base layer; the functional layer accounts for 30% of the total mass of the nonwoven composite. The fineness of the fine denier viscose fiber is 0.5dtex, and the length is 5 mm; the dry textile fiber web was made of 100% polyester fibers, the fiber linear density was 1.0dtex, and the fiber length was 38 mm.

As shown in fig. 2, a device for producing a fine and smooth super-soft non-woven composite material sequentially comprises the following processing procedures: a conveying unit, a liquid applying unit, a spunlace unit and a drying unit 401; a pre-wetting device is arranged on the conveying unit; the liquid applying unit is arranged behind the pre-wetting device.

Wherein:

the conveying unit comprises a circularly rotating net supporting curtain 101 and five guide rollers 102 for conveying the net supporting curtain; the pre-wetting device comprises a pre-wetting head 103 and a vacuum suction device A104 which are respectively and oppositely arranged on the upper side and the lower side of the net supporting curtain.

The liquid applying unit comprises a batching kettle 201, a storage kettle 202, a distributor 203, a liquid applying device and a liquid drawing device 205 arranged below the liquid applying device, wherein the batching kettle 201, the storage kettle 202, the distributor 203 and the liquid applying device are sequentially connected through pipelines; the liquid applying device and the liquid extracting device are respectively positioned above and below the fiber net 3. Stirrers are arranged in the batching kettle and the material storage kettle; the bottom of the storage kettle is provided with a screen with the aperture ratio of 50 percent and an impeller above the screen. And metering pumps 215 are respectively arranged on pipelines among the batching kettle, the material storage kettle and the distributor. The working liquid is input from the lower part of the distributor through the metering pump and then output to the liquid applying head of the liquid applying device from the upper part of the distributor.

The liquid application device comprises an aerodynamic mechanism 206 and a liquid application head 207. As shown in fig. 3-4, a plurality of liquid inlets 208, a cavity 209 and a liquid outlet slit 210 with a downward direction are sequentially arranged in the liquid applying head from top to bottom; a gas buffer cavity 211 is also arranged in the liquid applying head; the aperture of the liquid inlet is larger than that of the liquid outlet slit, and the cavity is expanded relative to the liquid inlet and the liquid outlet slit; 8 gas inlets 212 of the gas buffer cavity are arranged on the side wall of the liquid applying head, a bottom gas outlet of a gas outlet slit 213 positioned at the bottom of the gas buffer cavity is communicated with a bottom liquid outlet of the liquid outlet slit in an intersecting manner to form a gas-liquid mixing slit 214 (the width is 2 mm), and the gas-liquid mixing slit is arranged at the bottom of the liquid applying head and faces downwards; the air power mechanism is communicated with the air inlet; the liquid inlet is communicated with the distributor.

The spunlace unit comprises two groups of flat screen spunlace heads 301 and a circular drum spunlace device 302 which are arranged in front and back; a vacuum suction device B303 is arranged below the flat net water stabs through a net supporting curtain.

A preparation method of a fine and smooth super-soft non-woven composite material comprises the following steps:

(1) preparation of the base layer: opening and mixing textile fibers (polyester fibers), sending the textile fibers into a carding machine or an air-laid machine to prepare a dry textile fiber net, prewetting the dry textile fiber net, and sending the obtained wet textile fiber net onto a net supporting curtain.

(2) Preparation of the functional layer: adding water into the functional material (fine denier viscose fiber) and stirring until the functional material is uniformly dispersed; adding thickening agent (polyacrylamide) and water, and stirring to obtain working solution (the content of polyacrylamide is 0.12 wt%, the concentration of functional material is 0.7%, and the viscosity of working solution is controlled at 5 mPas); the working liquid is sent into the distributor, and then the working liquid is sent into the liquid applying head by the distributor.

(3) Application of the functional layer: the working solution is sprayed out from a gas-liquid mixing slit on the liquid applying head, the working solution is uniformly applied to a wet textile fiber net on a net supporting curtain along the width direction, and functional materials in the working solution are superposed on the wet textile fiber net to obtain a composite fiber net; and (4) sucking and recovering redundant thickening fluid in the working fluid in vacuum.

(4) Material compounding and reinforcing: and carrying out multiple spunlacing on the front surface and the back surface of the composite fiber web to enable the fibers to be mutually entangled, solidifying the functional material on the wet textile fiber web, and removing the thickening liquid remained in the fiber web.

(5) And (4) removing excessive water in the composite fiber web obtained in the step (4), drying and rolling to obtain a finished product.

And (3) comparison shows that:

in dry-laid webs, the clothing configuration and the gauge of the roller card determine the fibers suitable for carding, and generally the fibers have a linear density above 1.0dtex so that they are suitable for carding by means of the roller card, and fibers having a linear density below 1.0dtex require production by reducing production efficiency or even fail. The grammage of the output web of the card also places demands on the card clothing and the gauge, generally speaking, too low a web grammage requires a higher cylinder tooth density, while the doffer clothing also requires easier fiber handling and a smaller cylinder-to-doffer gauge to effect web transfer. Generally, the card clothing configuration of the carding machine is unrealistic to change in actual production, and meanwhile, the adjustment of the gauge is not beneficial to improving the productivity, so that the carding machine has certain limitations when processing superfine fibers, fibers with large modulus difference and fiber webs with low gram weight.

In conclusion, the technical route of dry-laid web formation and spunlace reinforcement of the fine and ultra-soft nonwoven composite material product in example 2 cannot be realized.

Example 3

The double-sided heterochromatic non-woven composite material has a mass per unit area of 80 g/square meter. As shown in fig. 1, comprises a functional layer 1 and a basic layer 2 which are connected with each other in an overlapped mode; the base layer is a dry-process textile fiber net; the functional layer is a functional material (colored fiber) fixed on the surface of the base layer; the functional layer accounts for 10% of the total mass of the nonwoven composite. The length of the colored fiber is 5 mm; the dry textile fiber net is prepared by mixing 50 percent of polyester fiber and 50 percent of viscose fiber, the linear density of the polyester fiber is 1.33dtex, and the fiber length is 38 mm; the viscose linear density is 1.64dtex, and the fiber length is 38 mm.

As shown in fig. 2, a double-sided different-color non-woven composite material production device sequentially comprises the following processing steps: a conveying unit, a liquid applying unit, a spunlace unit and a drying unit 401; a pre-wetting device is arranged on the conveying unit; the liquid applying unit is arranged behind the pre-wetting device.

Wherein:

the conveying unit comprises a circularly rotating net supporting curtain 101 and five guide rollers 102 for conveying the net supporting curtain; the pre-wetting device comprises a pre-wetting head 103 and a vacuum suction device A104 which are respectively and oppositely arranged on the upper side and the lower side of the net supporting curtain.

The liquid applying unit comprises a batching kettle 201, a storage kettle 202, a distributor 203, a liquid applying device and a liquid drawing device 205 arranged below the liquid applying device, wherein the batching kettle 201, the storage kettle 202, the distributor 203 and the liquid applying device are sequentially connected through pipelines; the liquid applying device and the liquid extracting device are respectively positioned above and below the fiber net 3. Stirrers are arranged in the batching kettle and the material storage kettle; the bottom of the storage kettle is provided with a screen with the aperture ratio of 50 percent and an impeller above the screen. And metering pumps 215 are respectively arranged on pipelines among the batching kettle, the material storage kettle and the distributor. The working liquid is input from the lower part of the distributor through the metering pump and then output to the liquid applying head of the liquid applying device from the upper part of the distributor.

The liquid application device comprises an aerodynamic mechanism 206 and a liquid application head 207. As shown in fig. 3-4, a plurality of liquid inlets 208, a cavity 209 and a liquid outlet slit 210 with a downward direction are sequentially arranged in the liquid applying head from top to bottom; a gas buffer cavity 211 is also arranged in the liquid applying head; the aperture of the liquid inlet is larger than that of the liquid outlet slit, and the cavity is expanded relative to the liquid inlet and the liquid outlet slit; 8 gas inlets 212 of the gas buffer cavity are arranged on the side wall of the liquid applying head, a bottom gas outlet of a gas outlet slit 213 positioned at the bottom of the gas buffer cavity is communicated with a bottom liquid outlet of the liquid outlet slit in an intersecting manner to form a gas-liquid mixing slit 214 (the width is 2.5 mm), and the gas-liquid mixing slit is arranged at the bottom of the liquid applying head and faces downwards; the air power mechanism is communicated with the air inlet; the liquid inlet is communicated with the distributor.

The spunlace unit comprises two groups of flat screen spunlace heads 301 and a circular drum spunlace device 302 which are arranged in front and back; a vacuum suction device B303 is arranged below the flat net water stabs through a net supporting curtain.

A preparation method of a double-sided heterochromatic nonwoven composite material comprises the following steps:

(1) preparation of the base layer: opening and mixing textile fibers (polyester/viscose fibers), sending the mixture into a carding machine or an air-laid machine to prepare a dry textile fiber net, prewetting the dry textile fiber net, and sending the obtained wet textile fiber net onto a net supporting curtain.

(2) Preparation of the functional layer: adding water into functional materials (colored fibers) and stirring until the functional materials are uniformly dispersed; adding thickening agent (polyacrylamide) and water, stirring to obtain working solution (the concentration of functional material is 0.5%, and the viscosity of working solution is controlled at 10 mPas); the working liquid is sent into the distributor, and then the working liquid is sent into the liquid applying head by the distributor.

(3) Application of the functional layer: the working solution is sprayed out from a gas-liquid mixing slit on the liquid applying head, the working solution is uniformly applied to a wet textile fiber net on a net supporting curtain along the width direction, and functional materials in the working solution are superposed on the wet textile fiber net to obtain a composite fiber net; and (4) sucking and recovering redundant thickening fluid in the working fluid in vacuum.

(4) Material compounding and reinforcing: and carrying out multiple spunlacing on the front surface and the back surface of the composite fiber web to enable the fibers to be mutually entangled, solidifying the functional material on the wet textile fiber web, and removing the thickening liquid remained in the fiber web.

(5) And (4) removing excessive water in the composite fiber web obtained in the step (4), drying and rolling to obtain a finished product.

And (3) comparison shows that:

whether the carded web or the air-laid web is formed, a longer fiber conveying system is arranged at the front end of the carded web or the air-laid web, the longer fiber conveying system is not beneficial to processing fibers with larger color difference, and the residue of colored fibers in the fiber conveying process can bring adverse effects to subsequent production.

Therefore, the "double-sided heterochromatic nonwoven composite" product of example 3 could not be produced using the conventional dry-laid, hydroentangled process.

Example 4

The plant petal-containing non-woven composite material has a unit area mass of 50 g/square meter. As shown in fig. 1, comprises a functional layer 1 and a basic layer 2 which are connected with each other in an overlapped mode; the base layer is a dry-process textile fiber net; the functional layer is a functional material (calendula petal sheet material and ultra-short superfine fiber) fixed on the surface of the base layer; the functional layer accounts for 25% of the total mass of the nonwoven composite. The petal sheet material accounts for 10% of the functional layer material by mass, the average thickness of the petal sheet material is less than 0.15mm, and the size of the petal sheet material is less than 3mm x 13 mm; the ultra-fine ultra-short fiber is made of viscose material and accounts for 10 percent of the functional layer material by mass, and the linear density of the ultra-fine ultra-short fiber is 0.8dtex, and the length of the ultra-fine ultra-short fiber is 7 mm; the dry textile fiber web was made of 100% viscose, the linear density of the viscose was 1.64dtex, and the fiber length was 38 mm.

As shown in fig. 2, a production device of a non-woven composite material containing plant petals sequentially comprises the following processing procedures: a conveying unit, a liquid applying unit, a spunlace unit and a drying unit 401; a pre-wetting device is arranged on the conveying unit; the liquid applying unit is arranged behind the pre-wetting device.

Wherein:

the conveying unit comprises a circularly rotating net supporting curtain 101 and five guide rollers 102 for conveying the net supporting curtain; the pre-wetting device comprises a pre-wetting head 103 and a vacuum suction device A104 which are respectively and oppositely arranged on the upper side and the lower side of the net supporting curtain.

The liquid applying unit comprises a batching kettle 201, a storage kettle 202, a distributor 203, a liquid applying device and a liquid drawing device 205 arranged below the liquid applying device, wherein the batching kettle 201, the storage kettle 202, the distributor 203 and the liquid applying device are sequentially connected through pipelines; the liquid applying device and the liquid extracting device are respectively positioned above and below the fiber net 3. Stirrers are arranged in the batching kettle and the material storage kettle; the bottom of the storage kettle is provided with a screen with the aperture ratio of 50 percent and an impeller above the screen. And metering pumps 215 are respectively arranged on pipelines among the batching kettle, the material storage kettle and the distributor. The working liquid is input from the lower part of the distributor through the metering pump and then output to the liquid applying head of the liquid applying device from the upper part of the distributor.

The liquid application device comprises an aerodynamic mechanism 206 and a liquid application head 207. As shown in fig. 3-4, a plurality of liquid inlets 208, a cavity 209 and a liquid outlet slit 210 with a downward direction are sequentially arranged in the liquid applying head from top to bottom; a gas buffer cavity 211 is also arranged in the liquid applying head; the aperture of the liquid inlet is larger than that of the liquid outlet slit, and the cavity is expanded relative to the liquid inlet and the liquid outlet slit; 8 gas inlets 212 of the gas buffer cavity are arranged on the side wall of the liquid applying head, a bottom gas outlet of a gas outlet slit 213 positioned at the bottom of the gas buffer cavity is communicated with a bottom liquid outlet of the liquid outlet slit in an intersecting manner to form a gas-liquid mixing slit 214 (the width is 3 mm), and the gas-liquid mixing slit is arranged at the bottom of the liquid applying head and faces downwards; the air power mechanism is communicated with the air inlet; the liquid inlet is communicated with the distributor.

The spunlace unit comprises two groups of flat screen spunlace heads 301 and a circular drum spunlace device 302 which are arranged in front and back; a vacuum suction device B303 is arranged below the flat net water stabs through a net supporting curtain.

A preparation method of a non-woven composite material containing plant petals comprises the following steps:

(1) preparation of the base layer: opening and mixing textile fibers (viscose fibers), sending the mixture into a carding machine or an air-laid machine to prepare a dry textile fiber net, prewetting the dry textile fiber net, and sending the wet textile fiber net onto a net supporting curtain.

(2) Preparation of the functional layer: adding water into functional material (marigold petal sheet material, superfine ultrashort fiber) and stirring to disperse uniformly; adding thickening agent (polyacrylamide) and water, stirring to obtain working solution (the concentration of functional material is 0.4%, and the viscosity of working solution is controlled at 4 mPas); the working liquid is sent into the distributor, and then the working liquid is sent into the liquid applying head by the distributor.

(3) Application of the functional layer: the working solution is sprayed out from a gas-liquid mixing slit on the liquid applying head, the working solution is uniformly applied to a wet textile fiber net on a net supporting curtain along the width direction, and functional materials in the working solution are superposed on the wet textile fiber net to obtain a composite fiber net; and (4) sucking and recovering redundant thickening fluid in the working fluid in vacuum.

(4) Material compounding and reinforcing: and carrying out multiple spunlacing on the front surface and the back surface of the composite fiber web to enable the fibers to be mutually entangled, solidifying the functional material on the wet textile fiber web, and removing the thickening liquid remained in the fiber web.

(5) And (4) removing excessive water in the composite fiber web obtained in the step (4), drying and rolling to obtain a finished product.

And (3) comparison shows that:

at present, dry-laid equipment such as carding and air-laid equipment can only process fiber-grade raw materials, and micro-sheet materials such as plant petals cannot be processed. Therefore, the technical route of dry-laid and hydroentangled reinforcement of the product containing the plant petal non-woven composite material in example 4 cannot be realized.

The raw materials and equipment used in the invention are common raw materials and equipment in the field if not specified; the methods used in the present invention are conventional in the art unless otherwise specified.

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, alterations and equivalents of the above embodiments according to the technical spirit of the present invention are still within the protection scope of the technical solution of the present invention.