JPS60259664A - Fiber sheet like article - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a thin, high heat-retaining textile silt material for clothing having excellent washing form stability.

[Prior art]

Various types of non-woven laminated sheets of ultra-fine denier fibers have been proposed as thermal fiber sheets for clothing, but they have poor bulk (swelling) when worn, lack sufficient heat retention, and are difficult to compress. Due to its low recovery properties, it has the disadvantage of becoming flattened and bulky after being worn for a long period of time. In order to improve this drawback,9 the present inventors first developed two materials that have poor adhesion to each other.
We propose a web-like sheet formed by opening staple fibers of splittable composite fibers, which are composed of thermoplastic polymer components of different types, one component separated by the other into multiple layers continuous in the fiber longitudinal direction. (Special application 1986-21)
No. 0282). This web-like sheet is characterized by a mixture of split fibrillated staple fibers and unsplit staple fibers at least in part, and has excellent heat retention and bulk compression recovery properties. It has excellent performance such as less volume loss due to settling.

However, although this fibrous sheet material has excellent performance as padding cotton for clothing, the individual fibers that make up the fibrous sheet become twisted when washed, especially when repeatedly washed with water using a household washing machine. It is still not fully satisfactory in that it is unevenly distributed and the heat retention property is reduced.

[Purpose of the invention]

The object of the present invention is to have excellent heat retention properties and bulk compression recovery properties. To provide a heat-insulating fiber sheet for clothing, which is a fiber sheet-like material with little sagging and has significantly improved washing form stability.

[Structure of the invention]

The present invention is a splittable composite fiber stay that is composed of two types of thermoplastic polymer components that have poor adhesion to each other, and in which one component is separated by the other component into a plurality of layers that are continuous in the longitudinal direction of the fiber. A web sheet formed by opening glue fibers, in which at least a portion of split fibrillated staple fibers and unsplit staple fibers (-) are mixed, and the web sheet Stable fibers are fused and bonded with heat-fused fibers with a fineness of 9 denier or less and a fiber length of 20 denier or more, which are contained in a weight ratio of 5 to 35%, resulting in excellent washing form stability. It is a fibrous sheet-like material.

To explain the present invention in more detail, 2. In the present invention, a combination of two types of thermoplastic polymer components having poor adhesion to each other is 2. For example, when polyester and polyolefin or polyester and polyamide are composite spun and drawn, Or even more nervous.

This refers to fibers that are easily peeled off by physical forces such as shrinkage due to compression or heating, but in order to prevent volume loss due to sag and obtain a fiber sheet with good compression recovery properties,
It is preferable that one of the two types of thermoplastic polymer components is a polyester containing 85 mol% or more of ethylene terephthalate units, and that the proportion of polyester in the composite fiber is 50 to 90% by weight. 1-I. Further, although a specific embodiment of the cross section of the splittable conjugate fiber according to the present invention is shown in FIG. 1, the present invention is not limited thereto.

A method for producing such splittable composite fibers by a composite spinning method is disclosed in Japanese Patent Publication No. 39-29636.

This is known from Japanese Patent Application Laid-Open No. 50-5650.

It has been suggested that fine denier fibrillar fibers can be easily formed by splitting according to this method.

In the present invention, the range of single fiber denier before splitting is 3 to 1.
0 denier, the denier of fibrillar fibers formed by split fibrillation is preferably 0.1 to 2 denier, and at least 10% by weight or more of single fibers are completely or partially split. is necessary. If split fibrillation of a single fiber remains midway and does not completely break apart, there may be a number of fibers between the unsplit thick denier fibers and the completely split fibrillation (formed fine denier fibrillar fibers). Although fibers of different deniers may exist, this does not hinder the achievement of the objects of the present invention.

The number of segments of the splittable composite fiber in the present invention may be determined to satisfy the above-mentioned denier range, and the greater the number of segments of one component in the single fiber, the greater the advantage of fibrillation. It is difficult to increase the number of segments so much, and it is easy to manufacture fibers when the number of segments is 2, usually 4 to 8. Also, the denier of the individual segments need not be the same.

The split type composite fiber staple fiber is prepared according to the conventional method.
It can be obtained by converging composite spun undrawn yarns, subjecting them to 9 mechanical crimps after stretching, and cutting them into finite fiber lengths. In order to avoid large shrinkage due to the dry heat treatment in the subsequent process, the fiber sheet of the present invention is produced by heat-treating split composite fiber staple fibers in advance using wet heat or dry heat or boiling water. It is preferable to keep the shrinkage rate at least 5% or less.

This composite stable fiber has a fiber length of 15 to 80
A range of 2.5 to 15 crimps/inch is preferable in order to suppress the occurrence of troubles, particularly neps, and to obtain a uniform web sheet.

The web-like sheet may be formed by any method such as carded web, random web, or blow-spreading method, but it is necessary to effectively split fibrillation to form thick denier single fibers before 9-split and thin denier fibrils after split. A method using carding is preferable because the fibers are mixed uniformly and the resulting web has a uniform thickness.

The heat-fusible fiber used in the present invention is a core-sheath type composite consisting of two types of thermoplastic polymers with different melting points, a polymer with a higher melting point as a core and a polymer with a lower melting point as a sheath. Fibers are preferred.

The melting point of the polymer on the low melting point side is 155°C or less because existing dry heat setting processing equipment can be used, and the iron 'j is k > K, Th ld heat resistance (7-) (
7. Area shrinkage. From the point to 125"C: It is preferable that
・. As such a heat-fusible fiber, use can be made of Rema 2, for example, in which a polyethylene phthalate polymer is arranged in the core and a polyethylene terephthalate polymer copolymerized with 30 to 40 mol% of isophthalic acid as an acid component is arranged in the sheath. The second object of the present invention can be fully achieved.

This heat-fusible fiber is mixed with the splittable conjugate fiber staple fiber and supplied to the opening device.
It is necessary to keep the amount in the range of 20% by weight. If it is less than 5%, the washing form stability will not be sufficient, and if it exceeds 35%, the fiber sheet will lose its softness and bulkiness (one carving). Further, the denier of the heat-fusible fiber must be 9 denier or less, preferably 5 denier or less. If the denier exceeds 9 denier, the fiber sheet will have excellent bulk but will lose its softness, making it unsuitable for use as padding for clothing.

It is necessary that the fiber length of the heat-fused fiber is 20 m or more, preferably 40 m or more, and if it is less than 20 m, the fibers will fall off in the opening device, which is not preferable.

In the present invention, the composite stable fiber in which a part of the fiber sheet-like material is split into split fibers and the undivided composite stable fiber are fused at their crosslinked portions by heat-sealing fibers, respectively and each other. This prevents the fibers from moving, twisting, and becoming unevenly distributed during washing.

Such a fusion bonding process is fully possible by using a known device as shown in FIG.
Temperatures in °C are used.

The washing form stability in the present invention was evaluated as follows. In other words, as a household washing machine, "
Aizuma" was used, and Zabu-1 manufactured by Kajo Soap Co., Ltd. was used as a detergent at a concentration of 0.15 liters/l.

Wash with water at a bath ratio of 1:50 for 15 minutes.

Observe the surface condition of the fiber sheet after repeating dehydration and air drying five times! ~is.

In addition, the sample was 25 crn x 25 cW from a fiber sheet material.
A square sheet cut into a size L was wrapped around the sheet at a pitch of 5 mm and then washed.

〔Example〕

Hereinafter, the present invention will be described in more detail with reference to Examples.

Example Intrinsic viscosity 0.63 (25°C in orthochlorophenol)
The first component was polyethylene terephthalate, and the second component was nylon 6 with a relative viscosity of 2.5 (in 95% sulfuric acid at 25°C).
A split type composite undrawn yarn having the same cross section as fat in FIG. 1 was obtained by winding it in minutes. The undrawn yarns were drawn together and stretched with a roller to a ratio of 3.5 times at a low stretching temperature of 80°C.

After the 1F fiber density was set to 4 denier, mechanical crimps were applied at 8 crimps/inch using a push crimper, and the fibers were temporarily taken into a container as a tow.

This tow was fed into an autoclave, subjected to relaxation heat treatment at 130° C. for 10 minutes, and then cut into lengths of 51 mm.

To this stable fiber, a single fiber fineness of 4 denier and a fiber length of 51 mm made by Nippon Ester Co., Ltd. was added to a heat-sealable fiber (trade name: Melchi-E, melting point: 130) to make up 15% by weight.
℃) was mixed, and then fed to a regular roller card and opened to form a web sheet with a basis weight of 100 P/rrl. When a part of the web sheet was taken and observed under an optical microscope, it was found that 9-split fibrillated composite stable fibers and unsplit composite staple fibers coexisted, and the proportion of the former was approximately 80%.

This web sheet was subjected to fusion bonding processing at 150° C. using the dry heat treatment apparatus shown in FIG.

The fibrous sheet-like product thus obtained was evaluated for its washing shape stability. When the surface condition of the fiber sheet material was observed after washing five times, no development was observed in which the individual fibers constituting the fiber sheet were twisted and unevenly distributed.

Part 1' Comparative Example In the example, composite stable fibers were supplied to a roller card without being mixed with heat-fusible fibers, and 5% acrylic emulsion resin was adhered to a web sheet formed by opening the fibers.

The fibrous sheet obtained by dry heat treatment at 130° C. was evaluated for washing shape stability.

When the surface condition of the fiber sheet material was observed after washing five times, it was observed that the individual fibers constituting the fiber sheet were twisted and unevenly distributed.

[Effects of the present invention]

According to the present invention, there is provided a heat-retaining fiber suitable for use as padding cotton for clothing such as ski wear, which is a fiber sheet-like material that has excellent heat retention properties and bulk compression recovery properties, and has little fading, and has good washing form stability. You can get a seat.

[Brief explanation of the drawing]

FIG. 1 is a fiber cross section of an example of a staple fiber of the splittable conjugate fiber of the present invention, and FIG. 2 is a schematic diagram of a dry heat treatment apparatus for a web sheet used in the present invention. 1... Polyethylene terephthalate, 2... Nylon-6, 3... Web sheet, 4... Conveyor belt, 5... Hot air, 6... Exhaust FILI 7. ...Blower 98...Heat exchanger, 9...Steam

Claims (1)

[Claims] A splittable conjugate fiber composed of two thermoplastic polymer components having poor adhesion to each other, one component being separated by the other component into a plurality of layers continuous in the fiber longitudinal direction. A web sheet formed by opening staple fibers. In the web sheet, at least a portion of split fibrillated staple fibers and unsplit staple fibers coexist, and in the web sheet, a weight ratio of 5.
A fibrous sheet-like article characterized in that staple fibers are fusion-bonded by heat-fusible fibers containing ~35% of fibers having a fineness of 9 denier or less and a fiber length of 20 mm or more.