JPH03137281A - Napped fiber sheet and its production - Google Patents

Abstract

PURPOSE:To obtain the subject soft sheet having high resistance to fluff falling by unevenly distributing a polymer elastomer to the side of a back side layer containing a woven or knitted fabric in a sheet composed of a front side layer prepared by sterically entangled ultrafine fiber and napping part of the aforementioned ultrafine fiber and the above-mentioned back side layer in a specific proportion. CONSTITUTION:A napped fiber sheet, obtained by laminating woven or knitted fabrics to both surfaces of a web prepared by sterically entangling conjugate fiber, composed of polyester or polyamide of <=0.8d size and capable of forming ultrafine fiber, needle punching the resultant laminate, applying a dispersion of a polymer elastomer (e.g. polyurethane elastomer) to the entangled sheet, dry coagulating the dispersion, dyeing the formed sheet, slicing the dyed sheet to 1/2 thickness and buffing the sliced sheet and constructing a front side layer composed of the ultrafine fiber with fluff and a back side layer having the woven or knitted fabric on the side opposite to the front side layer. The abundance ratio (X) of te aforementioned applied elastomer is preferably >=0.6 and a structure of the above-mentioned elastomer unevenly distributed in the back side layer is preferred from aspects of hand. The abundance ratio (X) is X = W1/W0 [W1 is elastomer weight (g) of the napped fiber sheet; W0 is weight (g) of the elastomer in the front side layer and back side layer of the napped sheet].

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a novel napped fiber sheet and a method for producing the same, and more specifically, the present invention relates to a novel napped fiber sheet and a method for producing the same. The present invention relates to a napped fiber sheet comprising an ultrafine fiber sheet and a method for producing the same.

The napped fiber sheet according to the present invention can be suitably used as artificial leather for clothing used in coats, jackets, skirts, etc., and as artificial leather for materials used in car seats, sofas, etc.

[Prior Art] Conventionally, a napped fiber sheet consisting of a woven or knitted fabric and an intertwined microfine fiber sheet having napped fluffs of microfine fibers on its surface has been described, for example, in JP-A-62-78281. etc. are known.

However, since the napped fiber sheet is generally impregnated with a polymeric elastomer, it has drawbacks such as a hard texture and a restricted directionality of fluff, making it impossible to obtain a beautiful fluffed surface.

Furthermore, in order to prevent the occurrence of such defects, if the amount of impregnated polymeric elastic material is reduced, a new disadvantage arises in that the fluff on the surface tends to fall off.

[Problems to be Solved by the Invention] The objects of the present invention are to improve the properties of a napped fiber sheet that conventionally has a woven or knitted fabric, entangled microfibers, and microfiber fluff on the surface: (1) polymer elasticity; Because the body is impregnated, the texture becomes hard and the direction of the fluff is restricted, making it impossible to obtain a beautiful fluffed surface.Conversely, (2) if the amount of impregnated polymer elastomer is reduced, the fluff on the surface becomes hard. To provide a napped fiber sheet and a method for producing the same, which can solve the two conflicting drawbacks of easy shedding, have a soft texture and a beautiful fluffed surface, and have less fluffy surface. It is.

[Means for Solving the Problems] As a result of intensive research to solve the above problems, the present inventors finally arrived at the present invention.

That is, the napped fiber sheet of the present invention is composed of the following components A to D, and at least one type of elastic polymer among the elastic polymers of element D is unevenly distributed near the woven or knitted fabric. It is a napped fiber sheet characterized by:

A. Three-dimensionally entangled ultrafine fibers with a fineness of 0.8 denier or less, B. Fluff on the surface consisting of a part of the ultrafine fibers, woven or knitted fabric near the C0 back surface, D. One or more types of polymeric elastic material. In addition, in the napped fiber sheet of the present invention, preferably, the abundance ratio X defined by the lower composition of at least one kind of polymeric elastomer is 0. It is characterized by being 6 or more.

X=W1/W0 However, W: Polymer elastic weight of the back layer of the napped fiber sheet (g)
) Wo: Polymer elastic weight of the surface layer and back layer of the napped fiber sheet (g) In the above formula, the surface layer and back layer are two sheets obtained by slicing the fiber sheet into 1/2 in the thickness direction. Of these sheets, the one with fluff on the front side is the front layer, and the one with the woven or knitted fabric near the back side is the back layer.

Further, the value of X is more preferably 0.8 or more, and most preferably 0.8 or more. 9 or more. Alternatively, preferably, it is a napped fiber sheet characterized in that ultrafine fibers are entangled with a woven or knitted fabric, or alternatively, a napped fiber sheet characterized in that it is impregnated with two or more types of polymeric elastic bodies. It is a fiber sheet.

In addition, in the method for producing a napped fiber sheet of the present invention, an entangled sheet having woven or knitted fabrics near both sides and made of ultrafine fibers and/or fibers capable of forming ultrafine fibers is impregnated with a polymer elastomer solution. The method for producing a napped fiber sheet is characterized in that the elastomer polymer is further coagulated while being unevenly distributed, and the sheet is further sliced into approximately 1/2 in the thickness direction.

Further, in the method for manufacturing such a napped fiber sheet, preferably, at least one kind of polymeric elastomer solution is an organic solvent solution of a polyurethane elastomer.

Alternatively, the method for producing a napped fiber sheet of the present invention includes:
An entangled sheet having woven or knitted fabrics near both sides and made of ultrafine fibers and/or fibers capable of forming ultrafine fibers is impregnated with a polymeric elastomer dispersion, and the polymeric elastomer is unevenly distributed. This is a method for producing a napped fiber sheet, which is characterized by coagulating and further slicing into approximately 1/2 in the thickness direction of the sheet. In addition, in the method for manufacturing such a napped fiber sheet, preferably, at least one kind of polymer elastomer dispersion is an aqueous dispersion of a polyurethane elastomer or an aqueous dispersion of an acrylic ester polymer. This is a method for producing a napped fiber sheet.

[Function] The napped fiber sheet of the present invention and the method for producing the same will be explained in more detail below.

The napped fiber sheet of the present invention has a fineness of 0, which is three-dimensionally entangled.
The constituent elements are ultrafine fibers of 8 deniers or less, fluff on the surface consisting of a part of the ultrafine fibers, a woven or knitted fabric present near the back surface, and one or more types of polymeric elastic bodies. , it is characterized in that it has a structure in which at least one kind of the polymeric elastic material among the polymeric elastic materials is unevenly distributed near the woven or knitted fabric existing near the above-mentioned back surface.

Here, uneven distribution refers to a state where it is distributed unevenly,
In the present invention, the present invention does not refer to a state in which the density of at least one type of polymer elastic material is distributed in the thickness direction of the sheet, but rather a state in which there is a difference in the density of at least one type of polymer elastic material in the thickness direction of the sheet.

Note that the unevenly distributed at least one type of polymer elastic body may be distributed throughout the sheet thickness direction, or there may be some locations where it is substantially absent. .

As for the degree of the above-mentioned uneven distribution, it is preferable that the abundance ratio X defined by the following formula of at least one kind of polymeric elastomer is 0.6 or more, and more preferably the value of X is:
It is 0.8 or more, most preferably 0.9 or more.

X=W1/W.

However, Wl: Polymer elastic weight of the back layer of the napped fiber sheet (g
)) Wo: Polymer elastic weight (g) of the surface layer and back layer of the napped fiber sheet. Of the two sheets, the one with the fluff on the front side is the front layer, and the one with the woven or knitted fabric near the back side is the back layer. Therefore, the X value is 0.5
In this case, the density of the elastic polymer is the same in the surface layer and the back layer, and is not said to be unevenly distributed.

By having such a structure, the raised fiber sheet of the present invention can reduce the amount of polymer elastomer impregnated, resulting in a hard texture and regulating the directionality of the fluff, resulting in a beautiful fluff surface. This solves the problem of having a soft texture and a beautiful fluffy surface, and also has the effect that the fluff on the surface does not easily fall off.

As a specific example of the method for obtaining the napped fiber sheet of the present invention, first, a web of ultrafine fibers or ultrafine fibers having a diameter of 0.8 denier or less is formed.

Furthermore, by overlapping the web and the woven or knitted fabric and subjecting them to appropriate entanglement treatment, the entanglement between the ultrafine fibers or the fibers that can be made to be ultrafine and between the ultrafine fibers or the fibers that can be made to be ultrafine and the woven or knitted fabric is further increased. , a step of applying a polymeric elastic material unevenly distributed near the woven or knitted fabric, a step of puffing the surface to create a fluff room, and, if necessary, an ultrafine fiberization step, a step of adding a polymeric elastic material 1, and slicing in the thickness direction. The napped fiber sheet of the present invention can be obtained by performing a combination of processes such as a step of drying, a dyeing step, and the like.

The polymer of the ultrafine fibers forming the web is not particularly limited, but polyethylene terephthalate (hereinafter referred to as
PET), polybutylene terephthalate (hereinafter referred to as
Polymers having fiber formation such as PBT), polyesters such as polyester elastomers, polyamides such as nylon 6 and nylon 66, polyurethanes, polyolefins, and acrylonitrile are most suitable. Among these, PET, PBT, nylon 6, nylon 66, etc. are particularly desirable from the viewpoint of product feel and practicality.

It is important that the thickness of the ultrafine fibers used in the present invention be 0°8 denier or less in order to improve the flexibility, feel, appearance quality, strength characteristics, etc. of the sheet.

Such ultrafine fibers can be obtained from the following composite fibers.

2 That is, for example, polymer array fibers made of two or more types of polymers (Japanese Patent Publication No. 18369/1983), splittable conjugate fibers made of adjacent two types of polymers with low mutual compatibility (Japanese Patent Publication No. 44-18369), In addition to those obtained from mixed spun fibers, such as those obtained from mixed spun fibers, in other words, by removing some components from these, the remaining components can be used to form ultrafine fibers. , ultrafine fibers produced by the super draw method can also be used.

However, the present invention is not limited to this, and various advanced forms of fibers can be applied based on this idea.

As a method for entangling the ultra-fine fibers or ultra-fine fibers of the present invention, and the ultra-fine fibers or ultra-fine fibers and the woven or knitted fabric, for example, two-dollar punching, high-speed fluid jetting, etc. can be applied. In order to sufficiently increase the bonding to the inner layer, it is particularly desirable to perform needle punching.

The fibers constituting the woven or knitted fabric of the present invention include synthetic fibers such as polyester, polyamide, and aramid, natural fibers such as cotton, wool, and silk, recycled fibers such as rayon, and semi-synthetic fibers such as acetate. Any available fiber can be used. The type of yarn to be used is not particularly limited, such as filament yarn, spun yarn, or a combination thereof, but when needle punching is used as a method to increase entanglement, 700 to 4
It is desirable to use a strongly twisted yarn of about 000 T/m because it can effectively prevent the woven or knitted fabric from being cut or damaged during punching.

The fabric weight of the woven or knitted material used in the present invention is 20 to 200 g/
It is desirable that it is in the range of m, most preferably from 30 to
It is in the range of 150 g/rd. Weight is 20g/rrr
If it is less than that, the form of the knitted fabric becomes extremely loose, wrinkles occur when layered on the surface of the web, and it becomes difficult to spread it out uniformly. Also, the basis weight is 200g/
Above rrf, the knitted fabric becomes too dense and entanglement with the web is generally difficult.

The type of woven or knitted fabric is not particularly limited, and various types of fabrics can be used, including warp knitting, tricot knitting, lace knitting, etc., and woven fabrics such as plain weaving, twill weaving, and satin weaving.

In the present invention, the polymeric elastic bodies unevenly distributed near the woven or knitted fabric include polyurethane, polyacrylic ester, 5BRX
Any polymer with rubber-like elasticity, such as NBR or polyamino acids, can be used, but it is particularly desirable to use polyurethane or polyacrylic ester in order to improve the feel and fluffing resistance of the sheet-like material. .

Furthermore, the film properties of the polymer elastic body itself include a stress at break of 30 to 800 kg/cnf and an elongation at break of 300.
~1000%, stress at 100% elongation 5~50kg/cf
Those having the following are more preferably used.

The elastic polymer must be unevenly distributed near the woven or knitted fabric in order to suppress the hardening of the texture of the sheet material as much as possible and effectively improve the resistance to fluffing. The abundance ratio X value is preferably 0.6 or more, and 0.6 or more.
It is more preferably 8 or more, and most preferably 0.9 or more. Therefore, as a method for imparting the elastic polymer, it is preferable to impregnate a sheet material with a solution or dispersion of the elastic polymer, solidify it by a dry or wet method, and distribute it unevenly near the woven or knitted fabric. It will be done.

Coagulation methods include the dry coagulation method in which hot air is applied to the sheet surface and the elastic polymer is unevenly distributed near the woven or knitted fabric through migration during drying, or the dry coagulation method in which the elastic polymer is unevenly distributed near the woven or knitted fabric by applying hot air to the sheet surface. A wet coagulation method can be used, such as impregnating the sheet with hot air and drying the surface layer by blowing hot air on the sheet surface, and then impregnating the sheet with an elastic polymer and coagulating it by distributing it unevenly near the woven or knitted fabric. According to their findings, the former dry method is preferable from the viewpoint of simplicity. In other words, from the perspective of productivity, specifically,
It has woven or knitted fabrics near both sides, and has ultrafine fibers and/or
Alternatively, an entangled sheet made of fibers capable of forming ultrafine fibers is impregnated with a polymer elastomer solution or dispersion, dry-coagulated while being exposed to hot air, and further sliced into 1/2 in the thickness direction. is desirable.

The amount of the elastic polymer that is unevenly distributed near the woven or knitted fabric used in the present invention is preferably 1 to 1-00% (weight % to the ultrafine fiber + woven or knitted fabric), and if it is less than 1%, it will have an effect on fuzz resistance. If it exceeds 100%, the texture of the sheet-like product will generally be hard.

Furthermore, in addition to the elastic polymer that is unevenly distributed near the woven or knitted fabric, it is also possible to impregnate and apply a known elastic polymer that does not become unevenly distributed.

The method of puffing and fluffing the surface used in the method of the present invention is generally performed by using sand paper and adjusting the thickness of the sheet-like material.

[Example] Next, the present invention will be described in further detail by giving examples and comparative examples.

The physical properties were measured using the following method.

Drape coefficient: JTS L1096 (1979, general textile test method) Fluff resistance: A sample measuring 25 cm long x 10 cm wide is pasted on the outer periphery of a horizontally placed cylinder with a diameter of i-8 cm, with the surface facing outward. Polyester 6, 22cm long x 5cm wide
A white broad cloth of 35% weight per ton is attached to the upper outer periphery of the cylinder so that the sample surface is in contact with the broad cloth. Then, by applying a longitudinal tension of 58.2 g and 15 cm to the broad cloth, it was brought into close contact with the upper outer periphery of the cylinder, and the sample was made to rub against the broad cloth by reciprocating it three times at an angular velocity of 12 degrees/second and an amplitude angle of 114 degrees. Visually judge the amount of fluff attached.

Those with no fuzz at all were rated as 10th grade, and those with significant fuzz were rated as 1st grade, and the results were divided into equal parts to determine the grade.

Example 1 Component ratio 80/20 consisting of polyethylene terephthalate as the island component and polystyrene as the sea component, number of items 16,
Composite fiber denier 3d, fiber length 51mm, number of crimps 14
Cards,
A web is created through the cross-wrapping process, and then 2
A pre-felt was obtained by needle punching at a rate of 50 needles/car. On both surfaces of the pre-felt, a plain woven fabric (weighing 90 g/rrf) using strong twisted raw silk (drawn yarn) with 750-36 f and twist number of 2000 T/m was spread uniformly and laminated together, and then needle punched at 2000 threads/d. Do this and get a weight of 65
A felt of 0 g/rd was obtained.

After shrinking the felt in hot water at 95°C, the polyurethane dispersion "Permarin UA150" (Sanyo Chemical Industry Co., Ltd.)
The sample was impregnated with a 18% water diluted solution of A.

Furthermore, after extracting and removing the sea component polystyrene with tetrachlorethylene, it was sliced into 1/2 thickness, and the sliced surface was puffed.

Furthermore, jet dyeing was carried out using a disperse dye at 120° C. for 60 minutes to obtain a fiber sheet with a thickness of 1.12 mm and a basis weight of 360 g/f1 (+).

In addition, after slicing to 1/2 thickness, the abundance ratio X value of the polymer elastic body measured from the nitrogen content was 0.78.

9 The obtained sheet has a soft texture and an elegant surface as shown in Table 1, and has excellent pilling resistance, and can be used as suede-like artificial leather for car seats, sports shoes, furniture, etc. It was suitable for non-clothing fields.

Example 2 The same procedure as in Example 1 was carried out except that the material was impregnated with a water-diluted polyurethane dispersion, heated and dried using microwaves, and then dried with hot air to obtain a material with a thickness of 1°12 mm and a basis weight of 355.
A fiber sheet of g/rrf was obtained.

The abundance ratio X value of the polymer elastomer was 0.57.

The obtained sheet had a soft texture as shown in Table 1, but was slightly inferior in pilling resistance and was somewhat unsatisfactory as a suede-like artificial leather compared to that of Example 1. .

Comparative Example 1 Same as Comparative Example 1 except that the concentration of the water diluted polyurethane dispersion was 30%, thickness 1.10 mm, basis weight 3
A fiber sheet of 63 g/% was obtained. The polymer elastomer abundance ratio was 0.50.

0 As shown in Table 1, the sheet obtained was excellent in fuzz resistance, but was unsatisfactory as a suede-like artificial leather, with poor flexibility in texture and poor surface appearance.

Example 3 Polyvinyl alcohol (P) was applied to the same felt as in Example 1.
VA) After impregnating with a 5% aqueous solution and drying, the sea component polystyrene was extracted and removed with tetrachloroethylene.

Then polytetramethyleneoxyglycol, 4.4
'-Diphenylmethane diisocyanate and 4.4'-Diaminodiphenylmethane were impregnated with a solution of polyurethane as the main component in N,N-dimethylformamide (12%), wet-coagulated in water, and then desolvated and desorbed in hot water. PVA
and dried. Furthermore, it was impregnated with a 1.5% water diluted solution of acrylic ester polymer water dispersion "Acronal YJ274.ID" (manufactured by Mitsubishi Yuka Purbushu ■), and after dry solidification by hot air drying, the thickness was reduced to 1/2. Slice it and puff the sliced side.

Furthermore, jet dyeing was carried out using a disperse dye at 120° C. for 60 minutes to obtain a fiber sheet with a thickness of 0.82 mm and a basis weight of 230 g/rrf. Furthermore, after slicing to 1/2 thickness, N,
The polymer elastomer abundance ratio measured from the nitrogen content after extraction with N-dimethylformamide was 0.91.

As shown in Table 2, the sheet obtained in this way has a very soft texture and an elegant surface, and has excellent pilling resistance, and can be used as a suede-like artificial leather for jackets, etc. It was suitable for the clothing field such as coats.

Comparative Example 2 A fiber sheet with a thickness of 0.82 mm and a basis weight of 225 g/I was obtained by the same operation as in Example 3 except that the aqueous dispersion of the acrylic ester polymer was not applied. .

Although the obtained sheet had a soft feel as shown in Table 2, it had poor fuzz resistance and was unsatisfactory as a suede-like artificial leather.

23 [Effects of the Invention] According to the present invention as described above, the following effects can be obtained.

In other words, the entangled ultrafine fibers and the woven or knitted fabric are stopped by the elastic polymer material that is effectively present near the back surface of the sheet where the woven or knitted material is present, so the density of the elastomer polymer is reduced on the surface. As a result, a high-quality napped sheet can be obtained that has a soft texture and elegant surface quality, and also has high resistance to fluffing.

Patent application Daitoshi Co., Ltd. 4

Claims (13)

[Claims] (1) A napped fiber sheet composed of the following constituent elements A to D, and characterized in that at least one type of polymeric elastic body among the polymeric elastic bodies of element D is unevenly distributed near the woven or knitted fabric. . A. Three-dimensionally entangled ultrafine fibers with a fineness of 0.8 denier or less, B. Fluff on the surface consisting of a part of the ultrafine fibers, C. Woven or knitted fabric near the back surface, D. One or more types of polymer elasticity. body, (2) The napped fiber sheet according to claim 1, wherein the abundance ratio X defined by the following formula of at least one kind of polymeric elastomer is 0.6 or more. X=W_1/W_0 However, W_1: Polymer elastic weight of the back layer of the napped fiber sheet (g
) W_0: Polymer elastic weight of the surface layer and back layer of the napped fiber sheet (g) In the above formula, the surface layer and back layer are two sheets obtained by slicing the fiber sheet into 1/2 in the thickness direction. Among the sheets, the one having fluff on the front side is referred to as the front layer, and the one having the woven or knitted fabric near the back side is referred to as the back layer. (3) The abundance ratio X of at least one kind of polymeric elastomer is 0
．． The napped fiber sheet according to claim 2, characterized in that the napped fiber sheet has a fiber count of 8 or more. (4) The abundance ratio X of at least one kind of polymeric elastomer is 0
．． The napped fiber sheet according to claim 2, wherein the napped fiber sheet has a napped fiber sheet of 9 or more. (5) The napped fiber sheet according to claim 1, 2, 3 or 4, wherein the ultrafine fibers are entangled with a woven or knitted fabric. (6) The napped fiber sheet according to claim 1, 2, 3, 4 or 5, characterized in that it is impregnated with two or more types of polymeric elastomers. (7) An entangled sheet that has woven or knitted fabrics near both sides and is made of ultrafine fibers and/or fibers capable of forming ultrafine fibers is impregnated with a polymeric elastomer solution, and the polymeric elastomer is unevenly distributed. A method for producing a napped fiber sheet, which comprises coagulating the napped fiber sheet and slicing it into about 1/2 in the thickness direction of the sheet. (8) The method for producing a napped fiber sheet according to claim 7, wherein the at least one polymeric elastomer solution is a solution of a polyurethane elastomer in an organic solvent. (9) The method for producing a napped fiber sheet according to claim 7, wherein the coagulation of the elastomer polymer is carried out by dry coagulation. (10) An entangled sheet having woven or knitted fabrics near both sides and made of ultrafine fibers and/or fibers capable of forming ultrafine fibers is impregnated with a polymeric elastomer dispersion, and further the polymeric elastomer is A method for producing a napped fiber sheet, characterized by coagulating it while unevenly distributing it, and slicing it into approximately 1/2 in the thickness direction of the sheet. (11) The method for producing a napped fiber sheet according to claim 10, wherein the at least one polymeric elastomer dispersion is an aqueous dispersion of a polyurethane elastomer. (12) The method for producing a napped fiber sheet according to claim 10, wherein the at least one polymeric elastomer dispersion is an aqueous dispersion of an acrylic ester polymer. (13) The method for producing a napped fiber sheet according to claim 10, wherein the coagulation of the elastomer polymer is carried out by dry coagulation.