JPH08199459A - Nonwoven fabric having zebraic pattern applied thereto and its production - Google Patents

Abstract

PURPOSE: To produce a flexible nonwoven fabric, rich in air permeability and light screening properties and excellent in mechanical characteristics by carrying out the high-pressure fluid treatment of a staple fiber web in plural stages on perforated supporting plates of different meshes and applying a zebraic pattern thereto. CONSTITUTION: The high-pressure fluid treatment of a web comprising polyester staple fibers is carried out on a fine perforated supporting plate of >=50 mesh and the high- pressure fluid treatment thereof is then performed on a coarse perforated supporting plate of <=25 mesh to apply a zebraic pattern having regions A, comprising formed open pores of a small area having <=17×10<-2> mm<2> X, >=350 open pores/cm<2> Y and 30-60% Z in the formula of open pore area X (mm<2> ) × open pore arrangement density Y (open pores/cm<2> ) = open pore area ratio Z (%) and three-dimensionally interlaced interstices among fibers in unopened pore parts and alternately existing with regions B comprising formed open pores of a large area having >=30×10<-2> mm<2> X, <=100 open pores/cm<2> Y and 30-70% Z in the formula and three-dimensionally interlaced interstices among the fibers at a higher level than that in the regions A in the unopened pore parts at (10-1000)/(10-100) arrangement interval A/B (mm) thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called spunlaced nonwoven fabric in which a high-pressure liquid stream is applied to a short fiber web, and more specifically, a entanglement treatment using porous support plates of different meshes and The present invention relates to a nonwoven fabric in which openings are provided and a zebra pattern is provided in one direction of the nonwoven fabric, and a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, as a method of imparting a pattern to a non-woven fabric, a printing method or a method of imparting a pattern under the condition of pressurizing and heating using an engraving roll in which the pattern is engraved on a roll is generally used. Known to be.

However, the printing method has a drawback in that the nonwoven fabric is required to have a certain hardness or more, and a flexible nonwoven fabric has a poor printing definition. In addition, in the method of imparting a pattern with an engraving roll, the heated engraving roll is pressed to impart the pattern, so that the flexibility of the nonwoven fabric is impaired.

On the other hand, a spunlace non-woven fabric is mentioned as a non-woven fabric having flexibility, and the pattern of the spun lace non-woven fabric is provided by forming openings. The opening is affected by the material of the porous support plate that supports the nonwoven web, the thickness of the net thread, the structure, etc.
Although there are flat, twill, ridge, etc., the spunlaced nonwoven fabric obtained by these porous support plates has uniform pores all over the surface and has uniform performance.

Further, as a method of partially imparting a pattern to the spunlaced nonwoven fabric, a porous web having a pattern portion in which the porosity of the pattern portion is further changed is formed on a non-woven web placed on a porous support plate. There is a method of stacking a flexible support plate and allowing a high-pressure liquid flow to act from above. According to this method, the high-pressure liquid flow passes only through the openings of the porous support plate having the pattern portion, so that the openings of the porous support plate on which the nonwoven web is placed are imparted to the nonwoven web. How to do it is provided.

However, in this method, since the pattern is formed in the non-woven fabric by changing the size and shape of the openings of the porous support plate having the pattern portion, there is a problem that the non-woven fabric as a whole lacks in denseness. The current situation is to have That is, the pattern portion through which the high-pressure liquid flow does not pass is not three-dimensionally entangled, so that the mechanical properties of the portion are inferior, and the shape retention of the entire nonwoven fabric is inferior.

The non-woven fabric obtained by this method is
The nonwoven fabric to which specific openings are provided is partially provided with openings different from the above-mentioned openings, and has a drawback that the sharpness of the pattern is inferior.

[0008]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a flexible non-woven fabric having a clear non-uniform pattern and excellent mechanical properties. It is intended to be provided.

[0009]

The inventors of the present invention have arrived at the present invention as a result of intensive research to achieve the above object. That is, the present invention is a non-woven fabric composed mainly of short fibers made of a thermoplastic synthetic polymer, in which pores having a small area are formed with a high disposition density and fibers are three-dimensionally entangled in the non-perforated portion. Regions A and large-area apertures are formed at a low disposition density, and in the non-perforated portions, the fibers are three-dimensionally entangled to a higher degree than in the non-perforated portions of the region A to provide a dense structure. The gist is a non-woven fabric having a zebra pattern, in which regions B are alternately provided in one direction in the non-woven fabric.

Further, a non-woven web composed of short fibers mainly made of a thermoplastic synthetic polymer is placed on a porous support plate having a fine mesh, and high-pressure liquid flow in which injection holes are uniformly arranged in the width direction. By performing a first-stage high-pressure liquid flow treatment using an injection device, an opening is formed in a portion corresponding to the opening of the mesh and a three-dimensional entanglement is provided between fibers existing in the non-opening. Then, it is placed on a coarse mesh support plate, and regions in which the injection holes are evenly arranged in the width direction and regions in which the injection holes are not arranged are alternately arranged in the width direction. By performing the second-stage high-pressure liquid flow treatment using the high-pressure liquid flow injection device, an opening is formed at a portion corresponding to the opening of the mesh, and the fibers are present between the non-opening portions. Higher three-dimensional entanglement than that of the first stage high pressure liquid flow treatment The manufacturing method of imparting nonwoven zebra pattern, characterized in that allowed to include a dense structure in which the subject matter.

Next, the present invention will be described in detail.

The present invention is a non-woven fabric composed of staple fibers mainly composed of a thermoplastic synthetic polymer. Examples of the thermoplastic synthetic polymer used in the present invention include a fiber-forming polyolefin-based polymer, a polyester-based polymer, a polyamide-based polymer and the like.

The polyolefin-based polymer is a fatty acid α-monoolefin having 2 to 18 carbon atoms, such as ethylene, propylene, butene-1, pentene-1, 3-methylbutene-1, hexene-1, octene-1, dodecene. -1, a homopolyolefin polymer consisting of ocdecene-1. This aliphatic α-monoolefin is a polyolefin copolymerized with other ethylenically unsaturated monomers such as butadiene, isoprene, pentadiene-1,3, styrene, and similar ethylenically unsaturated monomers such as α-methylstyrene. It may be a polymer. Also,
In the case of a polyethylene-based polymer, propylene, butene-1, hexene-1, octene-1 or a similar higher α-olefin may be copolymerized in an amount of 10% by weight or less with respect to ethylene. In the case of a system polymer, ethylene or a similar higher α-olefin may be copolymerized with propylene in an amount of 10% by weight or less, but the copolymerization rate of the above copolymer is the above% by weight. If it exceeds the above range, the melting point of the copolymer is lowered, and when fibers obtained from these copolymers are used as a nonwoven fabric, mechanical properties and dimensional stability are deteriorated under high temperature conditions, which is not preferable.

As the polyester polymer, an aromatic dicarboxylic acid such as terephthalic acid, isophthalic acid, naphthalene-2,6-dicarboxylic acid or an aliphatic dicarboxylic acid such as adipic acid or sebacic acid or an ester thereof is used as an acid component. And a homopolyester polymer or copolymer having an ester component of a compound such as ethylene glycol, diethylene glycol, 1,4-butanediol, neopentyl glycol, cyclohexane-1,4-butanediol. In addition, paraoxybenzoic acid, 5-sodium sulfoisophthalic acid, polyalkylene glycol, pentaerythithritol, bisphenol A acid, or the like may be added or copolymerized to these polyester polymers.

Polyamide polymers include polyimino-1-oxotetramethylene (nylon 4), polytetramethylene adipamide (nylon 46), polycapramide (nylon 6), polyhexamethylene adipamide (nylon 66), Polyundecanamid (nylon 11),
Examples thereof include polylaurolactamide (nylon 12), polymeta-xylene adipamide, poly-para-xylene decanamide, polybiscyclohexylmethane decanamide, or a polyamide-based copolymer having these monomers as a constituent unit. Particularly, in the case of polytetramethylene adipamide, polytetramethylene adipamide is obtained by copolymerizing polytetramethylene adipamide with other polyamide components such as polycapramide, polyhexamethylene adipamide, polyundecamethylene terephthalamide and the like in an amount of 30 mol% or less. It may be a pamide polymer. Copolymerization rate of the other polyamide component is 30 mol%
If it exceeds the above range, the melting point of the copolymer is lowered and mechanical properties and dimensional stability are lowered when the nonwoven fabric is used under high temperature conditions, which is not preferable.

As the combination of fibers constituting the nonwoven fabric of the present invention, the short fibers made of the above-mentioned thermoplastic synthetic polymer may be used alone, or a plurality of short fibers obtained from the thermoplastic synthetic polymer may be used. Well, if necessary, mainly staple fibers made of the thermoplastic synthetic polymer, cotton, cellulosic fibers such as ramie, may be used in combination with regenerated fibers obtained from pulp, when used in combination, The blending ratio may be appropriately selected in consideration of characteristics such as hygroscopicity required for the nonwoven fabric.

The nonwoven fabric of the present invention is a nonwoven fabric having a three-dimensional entanglement. In the present invention, the non-woven fabric having a three-dimensional entanglement means that the fibers constituting the carded short-fiber nonwoven web are entangled not only in the transverse direction but also in the thickness direction, and have an integrated structure. Means a non-woven fabric having This integrated structure means that the short fibers are predominantly entangled, and the bulk density is higher than that of the carded short fiber nonwoven web. In the present invention, the nonwoven fabric having a three-dimensional entanglement is a spunlace nonwoven fabric obtained by the water jet punch method.

In the nonwoven fabric of the present invention, regions A and regions B are alternately provided in one direction in the nonwoven fabric. Area A is
It is obtained by placing a short-fiber nonwoven web on a fine mesh porous support plate and subjecting it to a high-pressure liquid flow treatment. It is an area that is three-dimensionally entangled and has functions such as ventilation blocking, light blocking, heat retention, and water absorption.

The opening has an opening area of 17 × 10 ^-2 mm.
It is preferable that the density is ² or less, the hole arrangement density is 350 holes / cm ² or more, and the open area ratio is 30 to 60%. These relationships are represented by the following formula. X × Y = Z In the above formula, X is an opening area (mm ² ), Y is a hole arrangement density (pieces / cm ² ), and Z is an opening area ratio (%).

When the opening area exceeds 17 × 10 ^-2 mm ² and the hole arrangement density is less than 350 holes / cm ² , there is no clear difference between the areas and the area B, and the pattern is clear. It is not preferable because it is inferior in degree, and it is not preferable because it cannot retain sufficient functions such as ventilation blocking property, light blocking property, heat retaining property, and water absorption property.

If the open area ratio is less than 30%,
The degree of entanglement between the short fibers that make up the non-woven fabric is weak, and sufficient non-woven fabric strength cannot be obtained, resulting in low mechanical strength, which is not preferable, and when it exceeds 60%, sufficient ventilation barrier property, light-shielding property, and heat retention are provided. It is not preferable because the functions such as water resistance and water absorption are poor.

Considering the productivity of the nonwoven fabric, the open area is 86 × 10 ^{−4 to} 17 × 10 ⁻² mm ² , and the hole arrangement density is 3
50-3500 / cm ² and open area ratio is 30-6
It is more preferably 0%.

Region B is obtained by placing a short fiber nonwoven web on a coarse mesh porous support plate and subjecting it to a high pressure liquid flow treatment, with large area apertures being formed at low placement density and In the non-opened portion, the fibers are three-dimensionally entangled to a higher degree than the non-opened portion in the region A to have a dense structure,
This is a region having functions such as breathability and translucency.

The opening area is 30 × 10 ^-2 mm.
It is preferable that the density is ² or more, the hole arrangement density is 100 holes / cm ² or less, and the open area ratio is 30 to 70%. The relationship between these is represented by the following formula. In the following formula, X is the open area (mm ² ), Y is the hole arrangement density (pieces / cm ² ), and Z is the open area ratio (%). X × Y = Z If the opening area is less than 30 × 10 ⁻² mm ² and the hole arrangement density exceeds 100 holes / cm ² , a clear difference between the opening and the area A does not appear, It is not preferable because the pattern has poor definition, and it is not preferable because sufficient functions such as air permeability and translucency cannot be maintained.

If the open area ratio is less than 30%,
It is not preferable because sufficient functions such as air permeability and translucency cannot be maintained, and when it exceeds 70%, the shape stability and the like are poor, sufficient nonwoven fabric strength cannot be obtained, and mechanical strength is low, which is not preferable.

Considering the morphological stability of the non-woven fabric, the opening area is 30 to 430 × 10 ^-2 mm ² , and the pore arrangement density is 16
~ 100 / cm ² and open area ratio is 30-70%
Is more preferable.

Next, the manufacturing method of the present invention will be described. The nonwoven fabric of the present invention can be obtained by the following three major steps. First, as a first step, the short fibers are carded by a card machine to produce a short fiber non-woven web. This short-fiber non-woven web is a parallel card web in which the fibers are arranged in the traveling direction of the card machine, a cross-laid web in which the parallel card webs are cross-laid, or a cross-laid post-drafted web depending on the degree of fiber arrangement. One of a web in which the longitudinal and horizontal fibers are arranged in different directions and a random card web that is randomly arranged, or a semi-random card web in which both of them are arranged in a medium degree is selected.

In this step, the basis weight of the short fiber non-woven web is preferably 30 g / m ² or more and less than 200 g / m ² . When the basis weight is less than 30 g / m ² , the thickness of the non-woven web is insufficient, and the area A that is placed on the porous support plate having a fine mesh and subjected to the entanglement treatment and the porous support plate having a coarse mesh are used. It is not preferable because the difference from the region B which is placed and subjected to the confounding process is not clear. Further, the morphological stability of the nonwoven fabric cannot be maintained, which is not preferable. On the other hand, the basis weight is 20
When it exceeds 0 g / m ² , the processing energy of the high-pressure liquid flow is large when the short fiber nonwoven web placed on the porous support plate is subjected to the entanglement treatment, and the short fiber in the inner layer of the short fiber nonwoven web is short. It becomes difficult for the fibers to be entangled with each other, and practical mechanical properties cannot be obtained. Then, the thickness of the short fiber non-woven web becomes excessively large, and the difference in hole shape between the regions A and B becomes unclear, which is not preferable. Therefore, in consideration of productivity and the like, preferably 30 to 200 g / m ^2, more preferably in the range of ^{50g / m 2 ~150g / m 2} .

Then, in the second step, the short fiber non-woven web obtained in the first step is placed by a water jet punch method, that is, placed on a porous support plate to allow a high-pressure liquid flow to act, so-called spunlace. Obtain a non-woven fabric. In this step, by performing the high-pressure liquid flow treatment of the first and second stages, in the first-stage high pressure liquid flow treatment, pores are formed and the fibers constituting the short fiber nonwoven web are three-dimensionally entangled with each other. Then, in the second-stage high-pressure liquid flow treatment, the nonwoven fabric is formed with pores different from the above-mentioned pores, and the fibers present in the non-pore areas are more highly three-dimensionally entangled. Then, regions to be provided with a dense structure are alternately provided in one direction to obtain a non-woven fabric having a pattern as a whole.

This process will be described in detail. First, a short fiber non-woven web is placed on a porous support plate having a fine mesh, and a high pressure liquid flow injection device in which injection holes are uniformly arranged in the width direction is used. The first stage high pressure liquid flow treatment.

The mesh range of the porous support plate used in the first-stage high-speed liquid flow treatment uses a finer mesh than that of the porous support plate used in the second-stage high-speed liquid flow treatment, preferably 50 mesh. (50 / 25m
m) or more is used. If a mesh that is the same as or coarser than the porous support plate used in the second-stage high-speed liquid flow treatment is used, no pattern is imparted. Also, when a mesh of 50 mesh or more is used, it is between the opening provided in the short fiber nonwoven web in the first stage high pressure liquid flow treatment and the opening provided in the next second stage high pressure liquid flow treatment. It is preferable because the difference in the apertures appears clearly and the sharpness of the pattern is excellent.
Further, it is preferable because it can retain sufficient functions such as ventilation blocking property, light blocking property, heat retaining property and water absorption property. However, when the mesh range of the porous support plate exceeds 150 mesh, the energy cost required for entanglement of the short fiber non-woven web becomes large and the production cost increases. Therefore, considering productivity etc., 50
To 150 mesh, more preferably 5
It is in the range of 0 to 100 mesh.

As a high-pressure liquid jet device for performing the confounding treatment, there are a plurality of orifices in which jet holes each having a hole diameter of 0.05 to 1.5 mm are arranged in one row or a plurality of rows with an injection hole interval of 0.5 to 5 mm. A device in which ejection holes are arranged uniformly in the width direction may be used using the orifice heads arranged in steps.

When the high-pressure liquid stream is collided with the short fiber nonwoven web placed on the porous support plate, the orifice head provided with the injection holes is moved in the advancing direction of the short fiber nonwoven web. On the other hand, it is advisable to oscillate the orifice head at the same interval as the injection hole interval in the direction forming a right angle, and eject the high-pressure liquid flow to make it uniformly collide. Fibers that form a short-fiber non-woven web by causing a high-pressure liquid stream that is ejected in a high-pressure columnar form from an injection hole to impinge from above the short-fiber non-woven web to form an opening at a site corresponding to the opening of the mesh. The three-dimensional entanglement with each other to integrate them. As the fluid, water at room temperature or hot water can be used.

When the high-pressure liquid stream is jetted in this step, the porous support plate on which the short fiber non-woven web is placed has such a structure that the high-speed liquid flow can pass through the short fiber web on the support plate. As long as it is made of metal, polyester, or any other material.

This first-stage high pressure liquid flow treatment is preferably performed at least twice. That is, as the first entanglement treatment, a preliminary entanglement is performed on the short fiber nonwoven web by causing a high-pressure liquid flow having a water pressure of less than 40 kg / cm ² · G to act. At the time of this first entangling treatment, the water pressure is 40 kg / c.
At m ² · G or more, the short-fiber non-woven web is disturbed by the accompanying air flow generated by the high-pressure liquid flow, which results in uneven basis weight and is not preferable in maintaining the quality of the nonwoven fabric. The short fiber non-woven web which has been subjected to the first entanglement treatment is subsequently subjected to several entanglement treatments with a high pressure liquid flow having a water pressure of 50 kg / cm ² · G or more as the second and subsequent entanglement treatments. Furthermore, the short fiber non-woven web obtained by the above-mentioned method is reversed by the basis weight of the short fiber non-woven web, and the confounding treatment is performed by the hydraulic pressure applied in the second time as the third and subsequent entanglement treatments. It can be a non-woven web entangled with. By performing the first-stage high-pressure liquid flow treatment in this manner, an opening is formed at a site corresponding to the opening of the mesh and a three-dimensional entanglement is provided between the fibers present in the non-opening.

Next, a method of applying a second-stage high-pressure liquid flow treatment to impart a pattern in one direction will be described. The short-fiber non-woven web obtained by performing the first-stage high-pressure liquid flow treatment is placed on a porous support plate of a coarse mesh, and the injection holes are uniformly arranged in the width direction and the injection holes. The second-stage high-pressure liquid flow treatment is performed by using the high-pressure liquid flow injection device in which the regions in which are not arranged are alternately arranged in the width direction.

The mesh range of the porous support plate used in the second-stage high-pressure liquid flow treatment is one having a coarser mesh than that of the porous support plate used in the first-stage high-pressure liquid flow treatment, preferably 25 mesh (25 / 25m
m) The following are used. If the same mesh as or finer than the porous support plate used in the first-stage high-pressure liquid flow treatment is used, the three-dimensionally entangled fiber bundle is porous-supported by the first-stage high-pressure liquid flow treatment. The plate cannot be sufficiently moved along the mesh of the plate to provide the holes by the high pressure liquid flow treatment of the second stage, and the pattern is not provided.
In addition, it is not preferable because it cannot retain sufficient functions such as air permeability and translucency. Also, if you use 25 mesh or less,
A sharp difference between the openings formed in the short fiber nonwoven web by the first-stage high-pressure liquid flow treatment and the openings formed by the second-stage high-pressure liquid flow treatment appears, and the sharpness of the pattern appears. It is preferable because it is excellent. However, if the mesh becomes too coarse, for example, less than 10 mesh, the openings become clear, but the morphological stability of the nonwoven fabric cannot be maintained, which is not preferable. Therefore, considering the morphological stability of the nonwoven fabric, the preferable range of the mesh of the porous support plate used is 10 to 25 mesh.

As the injection holes used in the second-stage high-pressure liquid flow treatment, those used in the first-stage high-pressure liquid flow treatment can be used.

In the high-pressure liquid flow injection device used for the second-stage high-pressure liquid flow treatment, a region in which the injection holes are evenly arranged in the width direction and a region in which the injection holes are not arranged alternate in the width direction. For example, an orifice in which a high-pressure liquid flow is injected with an injection hole having a specific width and a non-arranged portion with a constant width is arranged next to the portion where the injection hole is arranged. The device used, an orifice head that can regulate the width to which holes are provided by adjusting the arrangement angle and the arrangement position with a plurality of orifice heads that can move in the width direction of the short fiber non-woven web Examples include installed devices.

The water pressure during the second stage high pressure liquid stream treatment may be lower than the water pressure during the first stage high pressure liquid stream treatment. By performing the second-stage high-pressure liquid flow treatment, the fiber bundles that have been three-dimensionally entangled by the first-stage high-pressure liquid flow treatment are moved along the mesh of the coarse mesh porous support plate to form a non-woven fabric. A unidirectional pattern is imparted, and the fibers existing in the non-opened areas are three-dimensionally entangled to a higher degree than the three-dimensional entanglement by the first-stage high-pressure liquid flow treatment, and a dense structure is obtained. In addition, when a high water pressure is used as compared with the water pressure during the first-stage high-pressure liquid flow treatment, the fibers existing in the non-opened areas are highly three-dimensionally entangled, resulting in a dense structure, a high fiber density, and a non-woven fabric. Strength is improved.

Using the above apparatus, the orifice head is oscillated in the direction perpendicular to the traveling direction of the short fiber non-woven web at the same intervals as the injection hole intervals to eject a high-pressure liquid stream. Then, the high-pressure liquid flow is injected into the region where the injection holes are evenly arranged in the width direction to form the openings at the portions corresponding to the openings of the mesh and the fibers existing in the non-opened areas. In the meantime, a non-woven fabric having a dense structure with three-dimensional entanglement higher than that obtained by the first-stage high-pressure liquid flow treatment is obtained (region B), while the region where the injection holes are not arranged is , The high-pressure liquid stream is not jetted (area A).

The widths of the area A and the area B are determined by the width of the area where the injection holes of the high-pressure liquid flow injection device used for the second stage high-pressure liquid flow treatment are arranged and the area where they are not arranged. Just select it.

For example, when used for clothing, it is advisable to alternately arrange the widths of the regions A and B at intervals of 10 to 50 mm to form a pattern.

When used as an agricultural sheet, the area A
Is a part that functions as a light-blocking property or air-blocking property, and region B is a part that functions as a light-transmitting property or breathability. When using in winter and summer, set the width of region A and region B according to their respective purposes. do it. For example, in an agricultural sheet that is stretched in a tunnel shape in the summer, a shaded portion (area A) of the solar radiation in the summer is formed in the center of the stretched sheet in the range of 50 to 70% of the entire sheet. 20-40% on both sides
To form a portion (area B) that functions as a breathable material and is formed on the both sides of the portion (area B) that functions as a breathable material.
Is formed in the range of 10 to 30%. In winter use, by changing the arrangement of the area A and the area B, it is possible to ensure the translucency, prevent the entry of cold air, and promote the growth of seedlings inside the sheet. As described above, the widths of the area A and the area B may be appropriately selected depending on the application.

Subsequently, in a third step, excess moisture of the short fiber non-woven web obtained as described above is removed by a known moisture removing device such as mangle, and further, by a hot band circulating dryer of a saxion band system. Dry it,
(EN) A nonwoven fabric having flexibility and three-dimensional entanglement and having a zebra pattern provided by alternately providing regions having different open area and hole arrangement density in one direction.

Through the steps 1 to 3 described above, it is possible to obtain a flexible nonwoven fabric which has a three-dimensional entanglement treatment and is provided with openings and which forms a pattern in one direction.

In the present invention, the first step / second step / third step may be continuous steps or, of course, separate steps.

[0048]

The nonwoven fabric of the present invention has the above constitution. That is, the short-fiber nonwoven web obtained by the first-stage high-pressure liquid flow treatment uses a porous support plate having a mesh coarser than that of the porous support plate used in the first-stage high-pressure liquid flow treatment. Perform a high-pressure liquid stream treatment of stages. Therefore, holes are provided by different meshes, regions A and B having different configurations are arranged in one direction, and a non-uniform pattern is given to the entire nonwoven fabric.

In the region A, the small-area open holes are formed with a high arrangement density by the first-stage high-pressure liquid flow treatment by the fine mesh porous support plate, and the fibers are three-dimensionally entangled in the non-open holes. Therefore, it becomes an area having functions of ventilation blocking property, light blocking property, heat retaining property, water absorbing property, and the like. On the other hand, in the region B, a large area of openings is provided at a low level by the second-stage high-pressure liquid flow treatment with the coarse mesh porous support plate, compared to the porous support plate used in the first-stage high-pressure liquid flow treatment. The fibers are densely formed, and in the non-perforated part, the fibers are three-dimensionally entangled to a higher degree than in the non-perforated part in the area A to provide a dense structure, and functions such as breathability and translucency are provided. It becomes an area to have.

[0050]

EXAMPLES Next, the present invention will be specifically described based on Examples and Comparative Examples.

The performance of the nonwoven fabric of the present invention was measured by the following method.

(1) Unit weight of non-woven fabric Five sample pieces having a sample width of 10 cm and a sample length of 10 cm were prepared, and the weight thereof was measured, and the average value was used as the basis weight (g / m ² ).

(2) Width of pattern Ten regions A and B of the obtained non-woven fabric were measured at 10 points respectively, and the average value was expressed in mm.

(3) Opening area (mm ² ) Universal projector (manufactured by Nippon Kogaku Co., Ltd.) Model PROJECT
Using OR V-12, the lengths of the 50 hole portions in the vertical direction a and the horizontal direction b for each of the regions A and B were measured in mm units with a decimal point of 3 digits or less, and axb was calculated. The average value of 50 holes was taken as the area of each aperture. Even if a small amount of fiber was present in the aperture, it was determined that it was not present.

(4) Density of holes (pieces / cm ² ) Universal projector (manufactured by Nippon Kogaku Co., Ltd.) Model PROJECT
1 cm each for regions A and B using OR V-12
^The number of holes in ² was counted at 10 places, and the average value was defined as the hole arrangement density (holes / cm ² ).

(5) Perforation area ratio (%) Perforation area ratio (%) = (ax × b) / (c × d) × 100 The area of the part is measured in the longitudinal direction a and the length in the lateral direction b in units of mm up to 3 digits after the decimal point. It was measured and calculated from the average value of 50 pieces by the above formula.

(6) Sharpness of pattern ◎ extremely clear ○ clear △ slightly clear × unsharp The results of visual judgment by 10 panelists were evaluated according to the above four grades based on the total score.

Example As the first step, bleached cotton having an average fineness of 1.5 denier and an average fiber length of 25 mm, and an average fineness of 2 denier and a fiber length of 51 m
m polyester short fiber (trade name <1 manufactured by Nippon Ester Co., Ltd.
01>) with a blending ratio of 30:70 and a random basis weight of 85 g / m ² by a random card machine.
A short fiber non-woven web was obtained.

Then, in a second step, the short fiber non-woven web was placed on a 70-mesh metal porous support plate moving at 20 m / min, and 50 m above the short fiber non-woven web.
At a position of m, a high pressure liquid flow injection hole has a hole diameter of 0.1 m.
m, the distance between the orifices is 0.6 mm, and the orifice heads are arranged in five rows.
A step high pressure liquid stream treatment was applied. That is, as the first entanglement treatment, preliminary entanglement was performed with water having a water pressure of 40 kg / cm ² · G at room temperature, and then as the second entanglement treatment, the net and the injection hole used for the preliminary entanglement were used, and 70 k
The entanglement treatment was performed four times with a water pressure of g / cm ² · G.
Further, as the third entanglement treatment, the same net and injection holes as described above were used to reverse the entangled non-woven fiber web, and the entanglement treatment was performed 5 times with a water pressure of 70 kg / cm ² · G. A short fiber non-woven web in which both front and back sides were closely entangled was obtained.

Experiment No. 1-5 introduce | transduce the obtained short fiber non-woven web on the porous support plate of the net mesh of the high pressure liquid flow process of the 2nd step | stage shown in Table 1, and as the injection hole of a high pressure liquid flow, said entanglement process. Same as the above, but the injection holes are orifices, and the narrowed portion and the non-blanked portion are alternately arranged at 100 mm intervals. The web was impacted and subjected to a second stage high pressure liquid flow treatment. The obtained experiment No. 1-5
The short fiber non-woven web of No. 3 was used as the third step to remove excess water by mangle, and then dried by a dryer at a temperature of 100 ° C. Experiment No. Nos. 6 to 11 are short fiber non-woven webs having a random basis weight of 85 g / m ² in which the fiber arrangement obtained in the first step is
It is placed on a metal mesh support plate of a net mesh of the first stage high pressure liquid flow treatment shown in Table 1 which moves at 20 m / min in the second step, and the same as in the first stage high pressure liquid flow treatment. gave. Then, as the second stage high-pressure liquid flow treatment, it was introduced onto a 20-mesh porous support plate and subjected to the same high-pressure liquid flow treatment as described above. The obtained experiment No. As a third step, the short fiber non-woven webs of 6 to 11 were used to remove excess water by mangle, and then dried by a dryer at a temperature of 100 ° C.

Experiment No. Nos. 12 to 14 are the high pressure of the first stage shown in Table 1 in which the short fiber non-woven web having a random basis weight of 85 g / m ² obtained in the first step moves at 20 m / min in the second step. The liquid flow treatment was carried on a net mesh metal porous support plate and was carried out in the same manner as in the first stage high pressure liquid flow treatment. Then, as the second-stage high-pressure liquid flow treatment, the second high-pressure liquid flow treatment shown in Table 1 was carried on the net mesh metal porous support plate and subjected to the same high-pressure liquid flow treatment as described above. . The obtained experiment No. As a third step, the short fiber non-woven web of 12 to 14 was used to remove excess water by mangle, and then dried by a dryer at a temperature of 100 ° C.

The above results are shown in Table 1.

[0063]

[Table 1]

Experiment No. Nos. 1 to 3, 8, 11, and 12 have small area openings formed by the porous support plate of the net mesh for the high-pressure liquid flow treatment of the first stage with a high arrangement density, and the non-open areas have tertiary fibers. Areas formed by original entanglement and large-area open holes formed by the porous support plate of the net mesh of the second-stage high-pressure liquid flow treatment are formed at a low disposition density, and in the non-open hole portion, the area between the fibers is the above-mentioned area. Areas that are three-dimensionally entangled to a higher degree than the non-apertured area of to provide a dense structure are alternately arranged,
It was a short fiber non-woven fabric to which an extremely clear pattern was imparted due to the difference in the shape of the apertures. However, in Experiment No. In No. 1, since the open area of the second-stage 8-mesh porous support plate was quite large, the morphological stability of the nonwoven fabric as a whole was slightly inferior.

Experiment No. Nos. 4, 10 and 13 have small area openings formed by the porous support plate of the net mesh of the high-pressure liquid flow treatment of the first stage with a high arrangement density, and the non-open areas have three-dimensional entanglement between the fibers. And a large area of holes formed by the porous support plate of the net mesh of the second stage high-pressure liquid flow treatment are formed with a low disposition density, and in the non-opened portions, the fibers are not opened in the area. It was a short fiber non-woven fabric in which regions which were three-dimensionally entangled to a higher degree than the parts and which had a dense structure were alternately arranged, and a clear pattern was imparted due to the difference in the aperture shape.

Experiment No. In No. 5, open pores having a small area were formed in a high density on the entire surface, and fibers were three-dimensionally entangled in the non-opened portion, and the unidirectional pattern was unclear. That is, after applying the pattern with 70 mesh, 8
Although the pattern with 0 mesh was partially applied, the pattern with 70 mesh remained on the surface of the non-woven fabric because a finer mesh was used than the one used for the high pressure liquid flow treatment of the 1st stage. No fiber bundle re-arrangement due to the high pressure liquid stream treatment of. Therefore, the pattern was unclear. This experiment No. 5 was designated as Comparative Example 1.

Experiment No. In No. 6, large-area open holes were formed over the entire surface with a low disposition density, and fibers were three-dimensionally entangled in the non-open holes, and the unidirectional pattern was unclear. That is, after applying the pattern with 16 meshes, 2
Although the pattern with 0 mesh was partially applied, the pattern with 20 mesh remained on the surface of the non-woven fabric because the mesh used was finer than that used for the high pressure liquid flow treatment in the 1st step. No fiber bundle re-arrangement due to the high pressure liquid stream treatment of. Therefore, the pattern was unclear. This experiment No. 6 was designated as Comparative Example 2.

Experiment No. In Nos. 7 and 14, small-area open holes are formed with a high arrangement density by the porous support plate of the net mesh of the first-stage high-pressure liquid flow treatment, and the fibers are three-dimensionally entangled in the non-open holes. Areas and large-area open holes formed by the porous support plate of the net mesh of the second stage high-pressure liquid flow treatment are formed at a low disposition density, and in the non-open area, the fibers are separated from the non-open area in the area. Is a short fiber non-woven fabric in which regions that are highly three-dimensionally entangled to provide a dense structure are alternately arranged, but the pattern due to the difference in the aperture shape is substantially clear.

Experiment No. In No. 9, the area of the 160 mesh porous support plate had slightly unclear open pores and weak entanglement between fibers. And a region in which large areas of open pores are formed by a 20-mesh porous support plate with a low disposition density, and fibers are highly three-dimensionally entangled in the non-opened areas to provide a dense structure. Was alternately arranged, and it was a short fiber non-woven fabric to which a very clear pattern was imparted due to the difference in the aperture shape.

[0070]

EFFECT OF THE INVENTION The nonwoven fabric of the present invention has pores of a small area formed by a porous support plate having a fine mesh at a high disposition density at the time of entanglement treatment, and three-dimensional entanglement among fibers occurs in the non-perforated portion. Area A and a large area of open pores formed by the coarser mesh porous support plate used in the entanglement treatment are formed at a low disposition density, and in the non-open hole portion, the fibers are closer to each other than the non-open hole portion of the area A. The regions B, which are highly three-dimensionally entangled and have a dense structure, have a zebra pattern provided alternately in one direction in the nonwoven fabric.
Since the regions A and B have different structures, their functions are also contradictory, and the spunlaced nonwoven fabric has a non-uniform pattern, excellent mechanical properties, and flexibility,
It is possible to provide a non-woven fabric useful for clothing, medical care, daily life materials, industrial materials, agricultural materials, daily necessities and the like.

Claims (5)

[Claims] 1. A non-woven fabric mainly composed of short fibers composed of a thermoplastic synthetic polymer, in which openings having a small area are formed with a high disposition density, and fibers are three-dimensionally entangled in non-open areas. Regions A and large-area apertures are formed at a low disposition density, and in the non-perforated portions, the fibers are three-dimensionally entangled to a higher degree than in the non-perforated portions of the region A to provide a dense structure. A non-woven fabric having a zebra pattern, wherein the regions B are alternately provided in one direction in the non-woven fabric. 2. A non-woven fabric composed of staple fibers mainly composed of a thermoplastic synthetic polymer, in which openings satisfying the following (1) are formed and fibers are three-dimensionally entangled in non-open areas. An area in which an aperture satisfying the following (2) is formed in the area A, and the fibers in the non-aperture portion are three-dimensionally entangled to a higher degree than the non-aperture portion in the area A to provide a dense structure. A non-woven fabric having a zebra pattern, wherein B and B are alternately provided in one direction in the non-woven fabric. (1) In the following formula, X is the open area (mm ² ), Y is the hole arrangement density (pieces / cm ² ), Z is the open area ratio (%), and the open area is 17 × 10 ^{−. 2} mm ² or less and hole arrangement density is 3
50 / cm ² or more, and the open area ratio is 30 to 60%. X × Y = Z (2) In the following formula, X is the opening area (mm ² ), Y is the hole arrangement density (pieces / cm ² ), and Z is the opening area ratio (%). Is 30 × 10 ^-2 mm ² or more, and the hole arrangement density is 1
The number of holes is not more than 00 / cm ² , and the area ratio of open holes is 30 to 70%. X × Y = Z 3. A non-woven fabric composed of staple fibers mainly composed of a thermoplastic synthetic polymer, in which openings satisfying the following (1) are formed and fibers are three-dimensionally entangled in non-open areas. An area in which an aperture satisfying the following (2) is formed in the area A, and in the non-open area, the fibers are three-dimensionally entangled to a higher degree than the non-open area in the area A to provide a dense structure. A non-woven fabric having a zebra pattern, wherein B and B are alternately provided in one direction in the non-woven fabric so as to satisfy the following condition (3). (1) In the following formula, X is the open area (mm ² ), Y is the hole arrangement density (pieces / cm ² ), Z is the open area ratio (%), and the open area is 17 × 10 ^{−. 2} mm ² or less and hole arrangement density is 3
50 / cm ² or more, and the open area ratio is 30 to 60%. X × Y = Z (2) In the following formula, X is the opening area (mm ² ), Y is the hole arrangement density (pieces / cm ² ), and Z is the opening area ratio (%). Is 30 × 10 ^-2 mm ² or more, and the hole arrangement density is 1
The number of holes is not more than 00 / cm ² , and the area ratio of open holes is 30 to 70%. X × Y = Z (3) The arrangement interval (A / B) (mm) between the area A and the area B is 10 to 1000/10 to 100. 4. A high-pressure liquid stream in which a non-woven web mainly composed of short fibers made of a thermoplastic synthetic polymer is placed on a porous support plate having a fine mesh, and injection holes are uniformly arranged in the width direction. By performing a first-stage high-pressure liquid flow treatment using an injection device, an opening is formed in a portion corresponding to the opening of the mesh and a three-dimensional entanglement is provided between fibers existing in the non-opening. Then, it is placed on a porous support plate having a coarse mesh, and the regions where the injection holes are evenly arranged in the width direction and the regions where the injection holes are not arranged are alternately arranged in the width direction. By performing the second-stage high-pressure liquid flow treatment using the high-pressure liquid flow injection device, an opening is formed at a portion corresponding to the opening of the mesh, and the fibers are present between the non-opening portions. Higher three-dimensional entanglement and more precise A method for producing a non-woven fabric with a zebra pattern, characterized by comprising a structure. 5. The porous support plate of fine mesh is a porous support plate of 50 mesh or more, and the porous support plate of coarse mesh is a porous support plate of 25 mesh or less. A method for producing a nonwoven fabric having a zebra pattern as described above.