JPH06240554A - Laminated fiber structure material and its production - Google Patents

Abstract

PURPOSE:To impart similar appearance, feeling, etc., on the obverse and reverse faces in a laminated fiber structure material of a web made of a fibrillated composite fiber, which is integrated with a reinforcing material and also to improve feeling of high density cloth used as the reinforcing material. CONSTITUTION:The laminated fiber structure material is produced by laminarly interlacing a web made of staple fibers of <=0.5 denier of single fiber fineness with a sheet shaped material made of filaments having a single fiber fineness different as much as <=0.1 denier from that of 'Mid staple fibers wherein the staple fibers protrude on the surface of the sheet shaped material. The laminated fiber structure material is also obtainable by laminating a web made of fibrillated composite fibers having single fiber fineness of <=0.5 denier after a splitting treatment with a sheet shaped material made of fibrillated composite fiber filaments having a single fiber fineness different as much as <=0.1 denier from that of the fibrillated composite fiber filaments after the splitting treatment, interlacing them with each other with ejecting fluid applied from the web side and subsequently subjecting the product to fibrilation treatment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nubuck-like fiber structure having a soft texture.

[0002]

2. Description of the Related Art Conventionally, various means for artificially producing a natural leather-like fiber structure have been proposed, and these general methods are to produce a woven or knitted fabric or a non-woven fabric using fine-fineness fibers, A natural leather-like appearance is obtained by raising the surface thereof.

For example, in Japanese Examined Patent Publication No. 53-20561, a knitted fabric is knitted by using dividable composite fibers, and the knitted fabric is divided into fibrils, which are then impregnated with a polymer elastic material such as polyurethane and the surface thereof is impregnated. It is described to obtain a pseudo leather-like body by polishing.

However, such fine-fine fibers are extremely difficult to handle in each step of forming a fiber structure, and it is also difficult to maintain the strength of the product. Therefore, in the above-mentioned invention, the problem is solved by adding a polymer elastic body, but there is a possibility that the texture may be hardened by adding a polymer elastic body or the like, and depending on the application, What is soft is required.

In order to have a certain degree of strength without using a polymer elastic body or the like, it may be considered to be integrated with a reinforcing material. For example, Japanese Laid-Open Patent Publication No. 54-101981 discloses that a coarse woven or knitted fabric is inserted between a web made of fibrillated composite fibers and a web made of ordinary fibers to be integrally entangled to obtain a leather-like sheet. There is.

Further, in Japanese Patent Laid-Open No. 53-122872, a web made of fibrillated composite fibers and a woven or knitted fabric made of high heat shrinkable fibers are laminated and integrated to perform split fibrillation and shrinkage. It is disclosed.

[0007]

However, there are some points to be noted when using the reinforcing material as described above. That is,
Aside from the case where the reinforcing material is completely buried in the ultrafine fiber web, when the reinforcing material appears on the surface of the integrated structure, the appearance and texture of the front and back surfaces are very different.

In the above-mentioned conventional techniques, all of these problems remain. This is largely due to the fact that the fibers used for the reinforcing material and the fibers of the ultrafine fiber web are significantly different, but such a fiber structure can only be of low quality when the surface of the reinforcing material is used as the surface.

As a result of earnest studies, the inventors of the present invention have found that the above problems can be solved by using a high-density cloth as disclosed in Japanese Patent Publication No. 62-8535, which is the application of the present applicant, as the reinforcing material. I got the knowledge. Further, they have found that the problem that the surface of the high-density fabric has a flat appearance and texture and is unsuitable for some kinds of applications can be solved by the present invention.

[0010]

According to the present invention, a single yarn fineness of 0.
A web made of short fibers having a denier of 5 denier or less and a sheet-like material made of filaments having a single yarn fineness difference of 0.1 denier or less from the fibers are laminated and entangled, and the surface of the sheet-like material is A laminated fiber structure characterized in that the short fibers are present.

The fiber structure of the present invention has a fineness difference of 0.1 between the web made of fibrillated composite fibers having a fineness of 0.5 denier or less after division and the fibrillated composite fibers after division. It can be obtained by laminating a sheet-like material composed of a fibrillated composite fiber filament having a denier or less, injecting a fluid from the web side to entangle and then performing a split fibrillation treatment.

The short fibers having a single yarn fineness of 0.5 denier or less as referred to in the present invention include those obtained by various known methods, for example, those obtained by directly spinning fine-fineness filaments and then cutting, the meltblown method, etc. Examples thereof include those in which a fine structure filament is directly spun to form a fiber structure, and those in which a composite fiber composed of a plurality of components is finely divided by a method such as dissolution and division.

The fiber length of the short fibers is preferably 25 to 60 mm, more preferably 30 to 45 mm. Within such a range, the entanglement treatment described later can be effectively performed, and the length of the short fibers protruding from the surface of the sheet-shaped material can be made appropriate.

A web made of such short fibers has a basis weight of 10
Approximately 100 g / m ² or so, and fibers other than the short fibers may be included as long as they do not significantly affect the texture.

Next, the present sheet material is a woven fabric, a knitted fabric or a non-woven fabric made of filament yarns having a difference in the single yarn fineness from the short fibers of 0.1 denier or less. The filament yarn is preferably made of the same component as that of the short fibers, and it is effective to use a yarn before cutting.

The sheet-like material preferably has a certain density. In the case of woven fabric, this is the value (cover factor) obtained by summing the square root of the total fineness (denier) × the number of shots (pieces / inch) in the weft direction (cover factor).
000 to 2500, further 1000 to 1500 in consideration of the confounding treatment with a fluid, the knitted fabric has a stitch density of 500 to 1000, and the others have a density according to this. It is different from the conventional coarse reinforcing material (so-called scrim).

The above-mentioned web and sheet-like material are laminated and entangled to form the present fibrous structure. The laminated form is such that the web is present on one surface and the sheet-like material is present on the other surface. In such a form, a plurality of webs and sheet-like materials may be laminated.

The laminated entanglement includes those entangled by various means as long as the short fibers of the web are uniformly entangled, but generally in the case of using needles such as needle punches,
It is difficult to uniformly entangle short fibers.

That is, in the present invention, it is preferable that the short fibers are evenly present on the surface, and between the weaves or stitches of the sheet-like material or between the single filaments of the multifilament constituting the sheet-like material. The state in which short fibers are present is preferable.

Since it is difficult to obtain such an entangled state by an entanglement method using a needle, it is preferable that the present fiber structure is obtained by a method of entangled with a fluid such as a water stream or an air stream.

Further, it is necessary that short fibers are present on the surface of the sheet material. This means that the entanglement treatment is applied from the web side, and as a result, the short fibers penetrate the surface of the sheet-like material and protrude from the surface of the sheet-like material.

If the length of the short fibers protruding from the web is too long, the nubuck-like texture is impaired.
It is preferably 0 mm or less.

Next, a method for manufacturing the present fiber structure will be described. As described above, the short fiber may be a short fiber obtained by any method, but particularly by using the method described below, the process can be simplified and a post-treatment peculiar to the present fiber structure described later can be performed.

That is, as described in Japanese Patent Publication No. 62-8535, etc., a composite fiber (hereinafter referred to as a fibrillated composite fiber) formed by joining fiber-forming polymers having a low affinity for each other mechanically, Fine and fine by peeling and splitting by chemical means. Especially, after cutting the composite fiber made by joining polyamide and polyester with 0.5 denier or less in each segment, swelling with benzyl alcohol etc. and splitting into each component Most preferred is the method of fibrillation.

An example of the cross-sectional shape of such a fibrillated composite fiber is shown in FIG. Of these, as shown in FIG.
Radially bonded components are preferred.

The short fibers composed of such composite fibers are subjected to a web-making process by a method such as a wet method or a dry method before being divided into fibrils, and then subjected to a split fibril-forming treatment. When the fibrillated composite fiber is used, the split fibrillation and the entanglement treatment can be performed at the same time during the fluid entanglement, and therefore, the treatment for entanglement of the excessively short fibers is not necessary. On the contrary, if the web is excessively entangled, split fibrillation does not easily occur, which is not preferable.

On the other hand, as a method for obtaining a sheet-like material used in this method, there is a method described in Japanese Patent Publication No. 61-37383. That is, after forming a woven or knitted product using the fibrillated composite fiber, using benzyl alcohol or the like,
This is a method of performing split fibrillation and shrinking of the polyamide component, and it is preferable to prepare a high-density woven or knitted fabric having the above-mentioned density by such a method.

However, when the densification is performed by using the shrinkage treatment together, it is preferable to perform the shrinkage treatment after the subsequent entanglement treatment because the short fibers can be firmly gripped.

Further, it is preferable that the shrinkage ratios of the fibrillated composite fibers forming the sheet and the fibrillated composite fibers forming the web are substantially the same after the entanglement treatment.

The web and the high-density woven and knitted fabric prepared as described above are laminated and subjected to an entanglement treatment. The entanglement treatment is performed by a water entanglement method using a fluid, particularly a high-pressure water stream ejected from a fine nozzle. The conditions such as the nozzle hole diameter and the jet pressure of the water stream may be appropriately set according to the converging force of the short fiber bundle, the type of knitted fabric, and the desired degree of entanglement. The preferable nozzle hole diameter is 0.
It is 05 to 0.3 mm. The jet pressure of the water stream is preferably 5 to 70 kg / cm ² . The shape of the water flow is arbitrary, and a sprinkling flow, a columnar flow, a fan flow, or the like is used. The water stream is jetted from the web side.

By the hydroentangling treatment, the short fibers made of the fibrillated type composite fibers are entangled with each other, and at the same time, the split fibrillation or the joint surface of the conjugate fibers is distorted.

When the laminated and entangled fiber structure is obtained in this manner, the fiber structure is treated with a known fibrillating agent such as benzyl alcohol to form a fibrillated composite fiber into split fibrils. I do.

Further, with respect to the fiber structure, Japanese Patent Publication No.
Shrinkage treatment may be carried out by using the method disclosed in JP-A-1-37383, etc.
It is good to shrink by 0 to 40%, more preferably 20 to 30%.

If the fiber structure is subjected to a water repellent treatment with a fluorine-based water repellent or the like, the water pressure resistance is 500 mm (JIS L-109).
7), air permeability 1 cc / cm ² / sec (JIS L
A moisture-permeable and waterproof fiber structure of about -1096 A) can be obtained.

Further, it goes without saying that the fiber structure may be subjected to various post-processing, and in addition to the water repellent treatment, dyeing,
Examples thereof include imparting a synthetic polymer elastic body, water absorption, antibacterial treatment, flame retardant processing and the like.

[0036]

【Example】

Example 1 A fibrillated composite fiber 2D obtained by joining polyethylene terephthalate (1) and 6-nylon (2), whose cross section is shown in FIG. 1 (a), was cut into 38 mm and made into short fibers. Was carded and a web having a basis weight of 40 g / m ² was obtained with a cross wrapper.

On the other hand, a knitted fabric having a 40 gauge interlock structure was knitted using the fibrillated type composite fiber filament. The web and the knitted fabric are laminated, and a water stream is jetted from the web side at a pressure of 10 kg / cm ² to obtain 0.0
Entangling treatment was performed at intervals of 8 cm, and the composite fibers were divided into fibrils by immersing in benzyl alcohol at room temperature to form ultrafine fibers having a single yarn fineness of 0.1 denier.

The resulting fiber structure had a nubuck-like soft texture and had a tear strength (JISL-1).
The 096 D method) was sufficient at 1.0 kg.

Further, when the surface was confirmed by an electron microscope (50 times), short fibers were also confirmed on the knitted fabric side. The drawings and photographs are shown in FIGS. 2 and 3.

Further, in the above treatment, after applying benzyl alcohol, it was subsequently heat treated under moist heat of ° C to shrink 20% in the weft direction, and a fiber structure to which a fluorine-based water repellent was added was manufactured.

Such a fiber structure has a water pressure resistance of 550 mm,
It was a nubuck-like fiber structure having a moisture permeability and waterproof property with an air permeability of 1.38 cc / cm ² / sec.

[0042]

EFFECT OF THE INVENTION The fiber structure according to the present invention is of a nubuck tone having a sufficient strength and a soft texture, and there is not much difference in appearance and texture between the front and back.

Therefore, the present fiber structure can be used for clothing and furniture by taking advantage of the texture, and can also be used as shoes, bags, etc. by using the sheet-like material side as the surface.

Further, according to the present method, such a fiber structure can be manufactured industrially and stably.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an example of a cross-sectional shape of a fibrillated composite fiber used in the present invention.

FIG. 2 is an enlarged view of the surface (knitted fabric side) of the fiber structure of the present invention.

FIG. 3 is an electron micrograph of the surface (knitted fabric side) of the fiber structure of the present invention, showing the shape of the fiber.

[Procedure amendment]

[Submission date] October 18, 1991

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

In the above treatment, after applying benzyl alcohol, it was subsequently heat-treated under moist heat at 40 ° C. to shrink 20% in the weft direction, and a fiber structure to which a fluorine-based water repellent was added was manufactured. . ─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] May 13, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0040

[Correction method] Change

[Correction content]

In the above treatment, after applying benzyl alcohol, it was subsequently heat-treated under moist heat at 40 ° C. to shrink 20% in the weft direction, and a fiber structure to which a fluorine-based water repellent was added was manufactured. .

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Claims (2)

[Claims] 1. A laminated entanglement of a web made of short fibers having a single yarn fineness of 0.5 denier or less and a sheet-like material made of filaments having a difference in single yarn fineness of 0.1 denier or less from the fibers. A laminated fiber structure in which the short fibers are present on the surface of the sheet-like material. 2. A web made of fibrillated composite fibers having a fineness of 0.5 denier or less after division and a fibrillation type having a fineness difference of 0.1 denier or less between the fibrillated composite fibers after division. A method for producing a laminated fiber structure, which comprises laminating a sheet-like material made of composite fiber filaments, injecting a fluid from the web side to entangle, and then performing a split fibrillation treatment.