JPH02200831A - Covering yarn for thermoforming - Google Patents

Abstract

PURPOSE:To obtain fiber cloth capable of being thermoformed without damaging appearance by making softening temperatures of covering yarn and core yarn >=room temperature and letting the covering yarn have a higher softening temperature than the softening temperature of the core yarn. CONSTITUTION:Softening temperatures of covering yarn and core yarn in the covering yarn are made >= room temperature and fiber of the covering yarn has a higher softening temperature than fiber of the core yarn. Cloth obtained from the covering yarn can be molded in a given shape when thermoformed at >= the softening temperature of the core yarn and surface appearance of molded article is hardly damaged.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to covering yarns. For more details,
The present invention relates to a covering yarn using fibers having a high softening temperature for the cover yarn and fibers having a low softening temperature for the core yarn.

[Conventional technology/problems to be solved by the invention] Irregularities are formed on thermoplastic fiber fabric using a method similar to that used to mold plastic sheets or films into three-dimensional objects by pressurizing or vacuum forming (hereinafter referred to as thermoforming). It is known that it is possible to give a three-dimensional shape. Unlike plastic sheets and films, fiber fabrics have a high-class appearance and feel, so fabrics with such three-dimensional shapes can be used as packaging materials such as case linings, interior decorations such as seat covers, etc.
Used for relatively high-class applications such as furniture.

However, when a thermoplastic fiber fabric is thermoformed, the fabric is deformed into the desired shape during thermoforming, and the fibers on the fabric surface are softened and deformed due to the influence of heat, which may impair the appearance of the fabric surface.

As disclosed in Japanese Patent Application Laid-Open No. 1983-93LH,
It is also known that for certain fiber fabrics such as pile, by combining pile yarns with a high softening temperature and base yarns with a low softening temperature, it is possible to obtain fabrics that can be thermoformed without damaging the appearance of the fabric. ing. However, other than specific fiber fabrics such as pile, there are almost no known fiber fabrics that can be thermoformed without damaging the appearance.

The object of the present invention is to scale almost any type of fiber fabric that can be thermoformed without compromising its appearance.

[Means for Solving the Problems] The present inventors thought that the above object could be achieved by imparting to the thread body the property of having thermoformability and not changing its appearance even after heat treatment, and further As a result of investigation, it was found that the above object could be achieved by using covering yarn.

That is, the present invention relates to a covering yarn in which the fibers of the cover system and the core yarn have a softening temperature above room temperature, and the fibers of the cover yarn have a softening temperature higher than the fibers of the core yarn.

The fabric obtained from the covering yarn of the present invention can be formed into a desired shape by thermoforming at a temperature higher than the softening temperature of the core yarn, and since the softening temperature of the cover yarn is high, the surface appearance of the molded product is hardly impaired. . Furthermore, since covering yarns can generally be processed into any type of fabric, it is possible to obtain almost any type of fibrous fabric from the covering yarn of the present invention which can be aged without deterioration of appearance.

[Example] The fibers forming the cover yarn of the covering yarn of the present invention have a softening temperature higher than that of the fibers forming the core yarn, specifically, 10°C or higher, preferably 20°C or higher, and more preferably 30°C or higher. be. Since the softening temperature of the fibers that will become the cover yarn is higher than the softening temperature of the fibers that will become the core yarn, there will be almost no change in the fibers that will become the cover yarn even after thermoforming the fabric obtained using the covering yarn. Because there is no fiber, the core fiber can be heated and molded into the desired shape while maintaining its appearance and texture.

The softening temperature referred to in this specification refers to a softening temperature measuring device that is generally used to measure the softening temperature of fibers (a fiber softening degree measuring device manufactured by Toyo Seiki ■), a load of 5 B/denier, and a sample of 3000 denier. The softening start temperature (tangential method) was determined by measuring at a temperature increase rate of 3° C./min with a trial length of 0 m1%. However, if the softening start temperature cannot be measured using this method because the tangent to the softening curve is unclear,
If it is not possible to measure the 0% shrinkage temperature or the 10% shrinkage temperature, the maximum shrinkage temperature may be determined and a relative comparison made.

Preferred specific examples of the fibers serving as the cover yarn include natural fibers such as cotton, hemp, wool, and silk, and among synthetic fibers, polyester fibers, polyamide fibers, and acrylic fibers that have a relatively high softening temperature. Fibers having a softening temperature higher than that of the fibers of the core yarn may be used. These fibers may be used alone or in combination of two or more. Note that some natural fibers do not soften even at high temperatures, and their softening temperature cannot be changed. In the case of such fibers, they shall be treated as fibers having a very high softening temperature.

The fibers that become the core yarn include acrylic fibers, acrylic fibers, polyvinyl chloride fibers, vinyl chloride fibers, polychloride fibers, etc., which have relatively low softening temperatures among synthetic fibers, and softening of the fibers of the cover yarn. Fibers having a softening temperature below the temperature can be used. These fibers may be used alone or in combination of two or more.

As a specific example of the combination of the fibers of the cover yarn and the fibers of the core yarn, natural fibers that do not have a softening temperature such as cotton, wool, or silk are used as the cover yarn, and synthetic fibers that have a softening temperature (acrylic fibers) are used as the cover yarn. fibers, acrylic fibers, vinyl chloride fibers, polyfural fibers) are used as core yarns, polyester fibers, polyamide fibers, acrylic fibers are used as cover yarns, and acrylic fibers, acrylic fibers, vinyl chloride fibers, polyfural fibers are used as cover yarns. Among the fibers, a core yarn made of fibers having a softening temperature lower than that of the cover yarn may be used.

In the case of the former combination, combinations such as cotton and acrylic fiber, cotton and polyfural fiber, cotton and acrylic fiber, wool and acrylic fiber, silk and acrylic fiber are preferable from the viewpoint of softening temperature difference, etc. In the case of combinations, polyester fibers and acrylic fibers, polyester fibers and acrylic fibers, polyester fibers and polyfural fibers, polyester fibers and vinyl chloride fibers, polyamide fibers and acrylic fibers, polyamide fibers and acrylic fibers, polyamide fibers and polyfural Combinations of fibers, such as combinations of acrylic fibers and acrylic fibers, and combinations of acrylic fibers and vinyl chloride fibers, are also preferred from the viewpoint of softening temperature difference.

The covering yarn for thermoforming of the present invention has no difference in appearance from general covering yarn, for example,
10-4 consisting of single fibers with a fineness of about 5 denier
A spun yarn or filament of about 20 to 40 count (cotton count) consisting of a cover yarn of spun yarn or filament yarn of about 0 count (cotton count) and a single fiber having a fineness of about 1.5 to 5 denier, for example. A common example is one that is spun using a core yarn of yarn and a normal covering yarn manufacturing method. The count of the covering yarn obtained in this way is generally about 2.0 to 5.0 (meter count) as a combination of cover yarn and core yarn. It has a wide range of applications.

The covering yarn of the present invention is processed into fabric by conventional methods. Although almost any type of fabric can be used, it is suitable for fabrics for which design is important, such as for upholstery and curtains. Furthermore, when processing into a fabric, the covering yarn of the present invention may be used alone or in combination with other spun yarns.

Preferred conditions for thermoforming a fabric using the covering yarn of the present invention include thermoforming at a temperature approximately equal to the softening point of the fibers of the core yarn and at least 10°C lower than the softening point of the fibers of the cover yarn. It is preferable to do so. By thermoforming a fabric using the covering yarn of the present invention under such conditions, a molded article of good shape can be obtained without impairing the feel or appearance of the fabric.

Since the covering yarn of the present invention uses thermoplastic fibers for the core yarn, it is possible to mold the yarn up to the sum of the overfeed amount of the cover yarn and the elongation of the cover yarn at the temperature during molding. In addition, by selecting the material for the cover yarn, we can respond to various requests, such as polyester fiber to meet light resistance requirements, and cotton or wool to meet natural texture requirements. sell. In addition, materials can be selected and molded according to the texture of the fabric and the surface quality characteristics.
and can maintain its shape.

The covering yarn of the present invention will be described below with reference to Examples, but the present invention is not limited thereto.

Example 1 Two threads (cotton count 30) of acrylic synthetic fiber (softening temperature 150°C) containing about 50% acrylonitrile and about 50% vinyl chloride were used as core threads, and polyester fiber (softening temperature 220°C) threads were used as core threads. (Cotton count 10) Two covering yarns were used as cover yarns, and a covering yarn of cotton count 24 was produced by overfeeding 1.3 times.

This covering yarn has a warp of 31 yarns/10 and a weft of 23 yarns/i.
A woven fabric was made by n-stroke. When this fabric was heated in an atmosphere of 200°C for 40 seconds and a molding test was performed using the matuti mold method, it was possible to achieve a development rate (ratio of the original fabric area to the surface area after molding) of 180%, and the core yarn was also covered. It is covered with thread and still retains the texture of polyester, and
It was possible to move around a molded object that maintained its shape using only the fabric.

Comparative Example 1 Instead of the cover yarn of the covering yarn of Example 1, the same acrylic fiber as the core yarn was spun with 30 count (cotton count).
A fabric for thermoforming was made in the same manner as in Example 1, except that the thread was used, and thermoforming was carried out under the same conditions as in Example 1, but the covering yarn in the covering yarn part of the molded product was thermally changed. Both appearance and texture were significantly different from before thermoforming, and the commercial value was low.

[Effects of the Invention] A fabric using the covering yarn of the present invention provides a molded article that maintains its shape without losing its texture or appearance even when subjected to thermoforming. Also, the covering yarn of the present invention can be used to coat almost all types of fabrics.

Claims (1)

[Scope of Claims] 1. A covering yarn in which the fibers of the cover yarn and the core yarn have a softening temperature higher than room temperature, and the fibers of the cover yarn have a softening temperature higher than the fibers of the core yarn. 2. The cover yarn is made of at least one of natural fibers, polyester fibers, polyamide fibers, and acrylic fibers,
The core yarn is made of at least one of acrylic fibers, acrylic fibers, vinyl chloride fibers, and polyclar fibers,
2. The covering yarn according to claim 1, wherein the covering yarn is composed of fibers whose softening temperature is 10° C. or more higher than the softening temperature of the core yarn. 3. A thermoforming fabric obtained from the covering yarn according to claim 1.