阅读说明：本技术 一种应用于婴儿湿巾且伸缩性优异的无纺布制造方法 (Method for manufacturing non-woven fabric with excellent elasticity and applied to baby wet tissue ) 是由 叶欣鸿 叶荣旭 于 2021-08-27 设计创作，主要内容包括：本发明公开一种应用于婴儿湿巾且伸缩性优异的无纺布制造方法,包括以下步骤：步骤一、丙纶切片经螺杆挤出机成纤维；步骤二、所得纤维得波浪型；所得纤维经过空气吹气牵引,牵引气流将纤维吹向导向辊；所述导向辊和牵引气流夹持纤维向下移动,纤维在经过多个导向辊形成波浪状；步骤三、纤维等间距得V型；水流间歇将经过步骤二的纤维冲击进入成型通孔,纤维的中间经水流冲击向远离水流方向形成弯折,进入成型通孔的纤维上下两端分别受到成型通孔上下两端限位弯折从而获得等间距V型纤维；将所得V型纤维制得目标无纺布；该发明通过牵伸开纤,促进纤维形成多孔结构,改善纤维的亲吸水性,同时纤维弹性优异,所得无纺布弹性好。(The invention discloses a method for manufacturing non-woven fabric with excellent elasticity, which is applied to baby wet tissues and comprises the following steps: step one, polypropylene slices are formed into fibers through a screw extruder; step two, obtaining a wave shape from the obtained fiber; the obtained fiber is dragged by air blowing, and the fiber is blown to the guide roller by the dragging air flow; the guide rollers and the traction airflow clamp the fibers to move downwards, and the fibers form a wave shape after passing through the plurality of guide rollers; step three, obtaining a V-shaped fiber at equal intervals; the fibers in the second step are impacted into the forming through holes by water flow intermittently, the middle of the fibers are bent towards the direction far away from the water flow by the impact of the water flow, and the upper end and the lower end of the fibers entering the forming through holes are respectively subjected to limiting bending at the upper end and the lower end of the forming through holes so as to obtain equidistant V-shaped fibers; preparing the obtained V-shaped fiber into a target non-woven fabric; the invention promotes the fibers to form a porous structure through drafting and opening, improves the hydrophilic property and the water absorption property of the fibers, and simultaneously has excellent fiber elasticity and good elasticity of the obtained non-woven fabric.)

1. A method for manufacturing a non-woven fabric which is applied to a baby wet tissue and has excellent elasticity, is characterized by comprising the following steps: the method comprises the following steps:

step one, polypropylene slices are formed into fibers through a screw extruder;

step two, obtaining a wave shape from the obtained fiber;

the obtained fiber is dragged by air blowing, and the fiber is blown to the guide roller by the dragging air flow; the guide rollers and the traction airflow clamp the fibers to move downwards, and the fibers form a wave shape after passing through the plurality of guide rollers;

step three, obtaining a V-shaped fiber at equal intervals;

the fibers in the second step are impacted into the forming through holes by water flow intermittently, the middle of the fibers are bent towards the direction far away from the water flow by the impact of the water flow, and the upper end and the lower end of the fibers entering the forming through holes are respectively subjected to limiting bending at the upper end and the lower end of the forming through holes so as to obtain equidistant V-shaped fibers;

and preparing the obtained V-shaped fiber into the target non-woven fabric.

2. The method for manufacturing a nonwoven fabric having excellent stretchability, which is applied to a baby wipe, according to claim 1, wherein: the polypropylene fiber slices are also mixed with polyvinyl alcohol, and the mass ratio of the polypropylene fiber slices to the polyvinyl alcohol is 10: 1.

3. The method for manufacturing a nonwoven fabric having excellent stretchability, which is applied to a baby wipe, according to claim 1, wherein: the device comprises a screw extruder and a water-gas stretching mechanism positioned below the screw extruder, wherein the water-gas stretching mechanism comprises a body, and a gas outlet hole and a water outlet hole which are arranged on the body;

the body is arranged along the width direction of the screw extruder, one side opposite to the air outlet hole and the water outlet hole is provided with a baffle plate, and the baffle plate is provided with guide rollers at uniform intervals along the vertical direction; the guide roller rotates relative to the baffle;

air flow and water flow sprayed by the air outlet holes and the water outlet holes and the fibers produced by the screw extruder are clamped by the guide rollers;

the baffle is provided with a forming through hole corresponding to the water outlet hole, and water sprayed from the water outlet hole can pass through the forming through hole.

4. The method for manufacturing a nonwoven fabric having excellent stretchability, which is applied to a baby wipe, according to claim 3, wherein: and the surface of the guide roller is uniformly distributed with acupuncture points.

5. The method for manufacturing a nonwoven fabric having excellent stretchability, which is applied to a baby wipe, according to claim 3, wherein: still include the return water tank, apopore spun water warp the shaping through-hole gets into the return water tank.

6. The method for manufacturing a nonwoven fabric having excellent stretchability, which is applied to a baby wipe, according to claim 3, wherein: the water-stop sheet is arranged outside the water outlet hole and used for blocking or yielding the water outlet hole through the driving assembly.

7. The method for manufacturing a nonwoven fabric having excellent stretchability, which is applied to a baby wipe, according to claim 3, wherein: the driving assembly is positioned above the water-stop sheet; the water-stop sheet comprises a horizontal shielding part and a vertical shielding part which are positioned on the upper side.

8. The method for manufacturing a nonwoven fabric having excellent stretchability, which is applied to a baby wipe, according to claim 3, wherein: the air outlet is communicated with the air supply unit; the water outlet hole is communicated with the water supply unit.

9. The method for manufacturing a nonwoven fabric having excellent stretchability, which is applied to a baby wipe, according to claim 8, wherein:

an air channel and a water channel are respectively arranged in the body of the water-gas stretching mechanism;

the air channel comprises a first storage area with a larger inner diameter and a first acceleration area with a smaller inner diameter;

the water channel comprises a second storage area with a larger inner diameter and a second acceleration area with a smaller inner diameter;

the first storage area is communicated with the gas supply unit;

the second storage area is communicated with the water supply unit.

Technical Field

The invention relates to the technical field of non-woven fabric manufacturing, in particular to a method for manufacturing a non-woven fabric which is applied to a baby wet tissue and has excellent elasticity.

Background

The polypropylene spunlace non-woven fabric has high tensile strength, good abrasion resistance, good air permeability and low price, is one of the fastest developed varieties in the non-woven fabric industry in recent years, and the use of the polypropylene spunlace non-woven fabric in the field of medical or infant products is limited due to extremely poor hydrophilicity.

The polypropylene spunlace nonwoven fabric is mostly formed by adding an auxiliary agent for improving hydrophilicity through spunlacing after agglomeration, and the improvement of hydrophilicity is limited.

Disclosure of Invention

The invention aims to provide a method for manufacturing a non-woven fabric which is applied to baby wet tissues and has excellent elasticity.

In order to solve the technical problem, the technical scheme of the invention is as follows: a method for manufacturing a non-woven fabric which is applied to a baby wet tissue and has excellent elasticity, is characterized by comprising the following steps: the method comprises the following steps:

step one, polypropylene slices are formed into fibers through a screw extruder;

step two, obtaining a wave shape from the obtained fiber;

the obtained fiber is dragged by air blowing, and the fiber is blown to the guide roller by the dragging air flow; the guide rollers and the traction airflow clamp the fibers to move downwards, and the fibers form a wave shape after passing through the plurality of guide rollers;

step three, obtaining a V-shaped fiber at equal intervals;

the fibers in the second step are impacted into the forming through holes by water flow intermittently, the middle of the fibers are bent towards the direction far away from the water flow by the impact of the water flow, and the upper end and the lower end of the fibers entering the forming through holes are respectively subjected to limiting bending at the upper end and the lower end of the forming through holes so as to obtain equidistant V-shaped fibers;

and preparing the obtained V-shaped fiber into the target non-woven fabric.

Preferably, the polypropylene slices are also mixed with polyvinyl alcohol, and the mass ratio of the polypropylene slices to the polyvinyl alcohol is 10: 1. According to the invention, polyvinyl alcohol is added into the fiber, PVA molecules have a large amount of hydrophilic hydroxyl groups, the PVA molecules are uniformly dispersed in the fiber, the fiber is porous, and the hydrophilicity of the fiber containing the PVA molecules is obviously improved.

The device preferably used comprises a screw extruder and a water-gas stretching mechanism positioned below the screw extruder, wherein the water-gas stretching mechanism comprises a body, and a gas outlet hole and a water outlet hole which are arranged on the body;

the body is arranged along the width direction of the screw extruder, one side opposite to the air outlet hole and the water outlet hole is provided with a baffle plate, and the baffle plate is provided with guide rollers at uniform intervals along the vertical direction; the guide roller rotates relative to the baffle;

air flow and water flow sprayed by the air outlet holes and the water outlet holes and the fibers produced by the screw extruder are clamped by the guide rollers;

the baffle is provided with a forming through hole corresponding to the water outlet hole, and water sprayed from the water outlet hole can pass through the forming through hole.

The hydrophilic fiber obtained by the invention is firstly clamped by the guide roller and the drafting airflow to obtain a wave shape, and then is matched with the through holes formed on the baffle plate at equal intervals through water flow to form a V shape, so that fiber opening is enhanced and the formation of a porous structure is promoted. On one hand, the guide rollers and the concave-convex structures forming the baffles can promote fiber opening in the process that the fibers move along the guide rollers, and the guide rollers rotate relative to the baffles to reduce friction between the baffles and the fibers and accelerate production. The regular shape of the obtained fiber enables the fiber to have elasticity, and the obtained non-woven fabric also has certain elasticity.

The fiber is clamped by matching the gas and the water sprayed by the water-gas stretching mechanism with the baffle, the water and the gas can stretch the fiber on one hand, the gas can enter the fiber to promote the just extruded fiber to form a porous structure on the other hand, and the water enters the porous structure to reinforce the structure to form and wet the fiber below at the same time, so that the fiber is further reinforced and stretched and refined; the air flow and the water flow impact the fibers on the surface of the baffle plate to effectively strengthen fiber splitting, the non-woven fabric has better adsorption effect, can effectively adsorb additives such as essential oil and the like to improve the sterilization and anti-inflammation effects, has certain water absorption performance when in use, and is suitable for practical use.

Further improved, the surface of the guide roller is uniformly distributed with acupuncture points. The acupuncture cooperates fibrous removal at the guide roll pivoted in-process, also improves fibrous pore-forming effect through the acupuncture simultaneously, further improves fibrous hydrophilicity.

The improved water-saving water dispenser is further improved and further comprises a water return tank, and water sprayed from the water outlet holes enters the water return tank through the forming through holes. Water flow sprayed from the water outlet holes flows back to the water return tank through the forming through holes, so that contact between water and fibers is effectively controlled, splashing of the water is reduced, and production environment is affected.

The improved water-stop plate is characterized in that a water-stop plate is arranged outside the water outlet hole, and the water-stop plate shields or abdicates the water outlet hole through a driving assembly. According to the invention, the water-stop sheet is intermittently controlled to move up and down, so that the fibers are equally spaced to form a V shape, and elastic fibers and non-woven fabrics are favorably obtained.

In a further improvement, the air outlet is communicated with the air supply unit; the water outlet hole is communicated with the water supply unit.

In a further improvement, the driving assembly is positioned above the water-stop sheet; the water-stop sheet comprises a horizontal shielding part and a vertical shielding part which are positioned on the upper side. The baffle prevents the sheltered water flow from splashing upwards to influence the screw extruder.

The body of the water-air stretching mechanism is respectively provided with an air channel and a water channel;

the air channel comprises a first storage area with a larger inner diameter and a first acceleration area with a smaller inner diameter;

the water channel comprises a second storage area with a larger inner diameter and a second acceleration area with a smaller inner diameter;

the first storage area is communicated with the gas supply unit;

the second storage area is communicated with the water supply unit.

The invention realizes the acceleration change of the flow velocity of air and water flow through the change of the inner diameter of the air channel and the water channel, strengthens the impact of the air and the water flow on fibers, and strengthens the formation of drafting, fiber splitting, porous structures, wave shapes and V shapes.

By adopting the technical scheme, the invention has the beneficial effects that:

according to the invention, the drafting airflow is matched with the guide roller to extrude high-temperature fibers extruded by the screw extruder into a wave shape while opening the fibers; then matching with the water flow and the forming through holes of the baffle plate, forming V-shaped fibers at equal intervals to obtain wave-shaped mixed V-shaped fibers at equal intervals;

the fiber prepared from the fiber has a structure of matching a wave shape with a V shape, so that the obtained non-woven fabric has good elasticity.

Thereby achieving the above object of the present invention.

Drawings

FIG. 1 is a schematic view showing the structure of a device used in a method for manufacturing a non-woven fabric having excellent stretchability, which is applied to a wet wipe for babies according to the present invention;

FIG. 2 is a wave-shaped and equidistant V-shaped forming process of fibers obtained from a non-woven fabric applied to a baby wipe and having excellent stretchability according to the present invention;

FIG. 3 is an enlarged view at A in FIG. 2;

FIG. 4 is a perspective view of the water-air drawing mechanism of the present invention;

FIG. 5 is a perspective view of a water-stop sheet according to the present invention;

FIG. 6 is a schematic view showing the structure of fibers used in the nonwoven fabric of the present invention.

In the figure:

a screw extruder 1; a water-gas stretching mechanism 2; an air outlet hole 21; a water outlet hole 22; an air passage 23; a first storage area 231; a first acceleration zone 232; a water passage 24; a second storage area 241; a second acceleration region 242; a baffle 3; a guide roller 31; forming the through-hole 32; a water return tank 4; a water-stop sheet 5; a drive assembly 6.

Detailed Description

In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following specific examples.

The present embodiment discloses a method for manufacturing a nonwoven fabric with excellent stretchability, which is applied to a baby wipe, as shown in fig. 1 to 6, and includes the following steps:

step one, polypropylene slices are formed into fibers through a screw extruder 1;

step two, obtaining a wave shape from the obtained fiber;

the resulting fibers are pulled by air blowing, which blows the fibers towards the guide rolls 31; the guide rollers 31 and the traction airflow clamp the fibers to move downwards, and the fibers form a wave shape after passing through the plurality of guide rollers 31;

step three, obtaining a V-shaped fiber at equal intervals;

the fibers in the second step are impacted into the forming through holes 32 intermittently by water flow, the middle of the fibers are bent towards the direction far away from the water flow by the impact of the water flow, and the upper end and the lower end of the fibers entering the forming through holes 32 are respectively limited and bent by the upper end and the lower end of the forming through holes 32, so that equidistant V-shaped fibers are obtained;

and preparing the obtained V-shaped fiber into the target non-woven fabric.

In this embodiment, the polypropylene fiber slices are further mixed with polyvinyl alcohol, and the mass ratio of the polypropylene fiber slices to the polyvinyl alcohol is 10: 1. According to the invention, polyvinyl alcohol is added into the fiber, PVA molecules have a large amount of hydrophilic hydroxyl groups, the PVA molecules are uniformly dispersed in the fiber, the fiber is porous, and the hydrophilicity of the fiber containing the PVA molecules is obviously improved.

The device used in the embodiment comprises a screw extruder 1 and a water-air stretching mechanism 2 positioned below the screw extruder 1, wherein the water-air stretching mechanism 2 comprises a body, and an air outlet 21 and an water outlet 22 which are arranged on the body;

the body is arranged along the width direction of the screw extruder 1, a baffle 3 is arranged on one side opposite to the air outlet hole 21 and the water outlet hole 22, and guide rollers 31 are uniformly spaced on the baffle 3 along the vertical direction; the guide roller 31 rotates relative to the baffle 3;

the air flow and the water flow sprayed from the air outlet holes 21 and the water outlet holes 22 and the guide roller 31 clamp the fibers produced by the screw extruder 1;

baffle 3 be equipped with the corresponding shaping through-hole 32 of apopore 22, shaping through-hole 32 supplies the rivers of apopore 22 spun to pass through.

The hydrophilic fiber obtained in the embodiment is firstly clamped by the guide roller 31 and the drafting airflow to enable the fiber to obtain a wave shape, and then the V shape is formed by the water flow and the forming through holes 32 on the baffle 3 which are matched with each other at equal intervals, so that the fiber opening is strengthened and the formation of a porous structure is promoted. On one hand, the guide rollers 31 and the concave-convex structures forming the baffle plates 3 promote fiber opening in the process that the fibers move along the guide rollers 31, and the guide rollers 31 rotate relative to the baffle plates 3 to reduce friction between the baffle plates 3 and the fibers and speed up production. The regular shape of the obtained fiber enables the fiber to have elasticity, and the obtained non-woven fabric also has certain elasticity.

In the embodiment, the water and the gas sprayed by the water-gas stretching mechanism 2 are matched with the baffle 3 to clamp the fibers, the water and the gas can stretch the fibers on one hand, the gas can enter the fibers to promote the fibers which are just extruded to form a porous structure on the other hand, and the water enters the porous structure to reinforce the structure to form the fibers which are wetted below at the same time, so that the fiber is further reinforced and stretched; the air flow and the water flow impact the fibers on the surface of the baffle 3 to effectively strengthen fiber splitting, the obtained non-woven fabric has better adsorption effect, can effectively adsorb additives such as essential oil and the like to improve the sterilization and anti-inflammation effects, and has certain water absorption performance when in use, thereby being suitable for practical use.

In this embodiment, the surface of the guide roller 31 is uniformly distributed with needle pricks. The needle punching is matched with the movement of the fibers in the rotating process of the guide roller 31, and meanwhile, the pore-forming effect of the fibers is improved through the needle punching, so that the hydrophilicity of the fibers is further improved.

The water-saving device further comprises a water return tank 4, and water sprayed from the water outlet hole 22 enters the water return tank 4 through the forming through hole 32. Water flow sprayed from the water outlet hole 22 flows back to the water return tank 4 through the forming through hole 32, so that contact between water and fibers is effectively controlled, splashing of the water is reduced, and production environment is affected.

In this embodiment the outside of apopore 22 is equipped with a water-stop sheet 5, water-stop sheet 5 shelters from or abdicates through drive assembly 6 apopore 22. According to the invention, the water-stop sheet 5 is intermittently controlled to move up and down, so that the fibers are equally spaced to form a V shape, and elastic fibers and non-woven fabrics are favorably obtained.

The air outlet 21 in the embodiment is communicated with an air supply unit; the water outlet 22 is communicated with the water supply unit.

In this embodiment, the driving assembly 6 is located above the water-stop sheet 5; the water-stop sheet 5 includes a horizontal shielding portion 51 and a vertical shielding portion 52 on the upper side. The baffle 3 prevents the shielded water flow from splashing upwards to affect the screw extruder 1.

In the embodiment, the body of the water-air stretching mechanism 2 is internally provided with an air channel 23 and a water channel 24 respectively; the air passage 23 includes a first storage region 231 having a larger inner diameter and a first acceleration region 232 having a smaller inner diameter; the water passage 24 includes a second storage region 241 having a larger inner diameter and a second acceleration region 242 having a smaller inner diameter; the first storage area 231 is communicated with the gas supply unit; the second storage region 241 is communicated with a water supply unit. The invention realizes the acceleration change of the flow velocity of air and water flow through the change of the inner diameter of the air channel 23 and the water channel 24, strengthens the impact of the air and the water flow on fibers, and strengthens the formation of drafting, fiber splitting, porous structures, wave shapes and V shapes.

According to the invention, the drafting airflow is matched with the guide roller 31 to extrude the high-temperature fibers extruded by the screw extruder 1 into a wave shape while opening the fibers; then matching with the water flow and the forming through holes 32 of the baffle 3 to form V-shaped fibers at equal intervals, and obtaining wave-shaped mixed V-shaped fibers at equal intervals;

the fiber prepared from the fiber has a structure of matching a wave shape with a V shape, so that the obtained non-woven fabric has good elasticity.

The specific working process of this embodiment is as follows:

the screw extruder 1 extrudes fibers, the fibers are impacted on the guide rollers 31 on the surface of the baffle 3 by the inclined downward airflow sprayed by the water-air stretching mechanism 2, the fibers are opened by the airflow, and the fibers form a wave microstructure by the guide rollers 31;

the fibers are impacted into the forming through holes 32 of the baffle 3 to be formed by the inclined downward water flow sprayed by the water-air stretching mechanism 2, the middle parts of the fibers are impacted by the water flow, and the bending of the fibers is promoted by the upper and lower edges of the forming through holes 32 to strengthen the forming;

the wetted fibers further promote the drafting of the fibers produced by the screw extruder 1, the fibers are refined, the bending forming of the fibers is realized by the water flow and the air flow matched with the baffle 3 and the guide pipe, and the elasticity of the obtained fibers is improved;

the non-woven fabric obtained by the invention has uniform thickness at each part and good uniformity, and the average pore diameter of the non-woven fabric is 12.6 mu m by using a capillary flow pore diameter analyzer.

The average pore size of the conventional spray-melt nonwoven fabric in the prior art is 6 μm.

The nonwoven fabric obtained in this example had a machine direction strength of 10.89MPa, a machine direction extensibility of 305%, a desirable lightness of 4.68MPa, and a cross direction extensibility of 261%. The mechanical property test instrument of the non-woven fabric obtained in the embodiment is an XQ 1 type fiber strength and elongation instrument; the test specimen specification is 100mm multiplied by 20mm, the distance between chucks is 50mm, and the stretching speed is 250 mm/min.

In the water absorption test of the nonwoven fabric obtained in this embodiment, a 30mm × 60mm sample is taken, the dry weight of each sample is weighed, the sample is completely immersed in a container filled with clear water, the sample is placed for 30 minutes, the sample is shaken slightly before weighing, no water is dropped and the weight of the sample is weighed, and the water content is equal to the wet weight of the sample-the dry weight of the sample; water content rate is water content/dry weight of sample; the nonwoven fabric obtained in this example had an average dry weight of 0.0711g, a water content of 1.052g, and a water content magnification of 14.8 times. The melt-blown nonwovens (polypropylene) obtained in the prior art do not absorb water substantially without the addition of auxiliaries.

According to the test data, the non-woven fabric prepared by the invention has good elasticity and hydrophilicity, is suitable for being applied to infant wet tissues, and can reduce the use of sexual auxiliary agents and reduce the stimulation of the auxiliary agents to the skin of an infant.

The above embodiments and drawings are not intended to limit the form and style of the present invention, and any suitable changes or modifications thereof by those skilled in the art should be considered as not departing from the scope of the present invention.