JPH0133657Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a special fabric. More specifically, the present invention relates to a fabric made of polyacrylonitrile-based foamed synthetic fibers that has excellent cushioning and heat retention properties.

In recent years, many fabrics made of foamed plastic fibers or hollow structures have been proposed.

Examples include tatami covers and rugs that use hollow or foamed polypropylene structures as wefts. However, such polypropylene rugs have various drawbacks and are not practical.
For example, it has problems with hygroscopicity, water absorption, feel, cushioning, etc., and it feels sticky to the skin, especially in hot and humid conditions during summer.

The purpose of this invention is to provide a fabric that has the natural feel, appropriate moisture absorption, water absorption, and cushioning properties of polyacrylonitrile foam synthetic fibers, in order to improve the drawbacks associated with the conventional products mentioned above. There is.

That is, the present invention is a fabric made of foamed fibers of acrylonitrile polymer, in which single yarns having sinusoidal undulations of different amplitudes intersect at each peak and valley, and the warp and weft yarns intersect at each crest and valley. This is a special woven fabric characterized by the fact that one of the single yarns is uniformly raised on both the front and back sides.

The foamed fibers made of an acrylonitrile polymer used in the present invention are produced as follows. For example, 70 to 90 parts by weight of a polymer consisting of 90% by weight of acrylonitrile and 10% by weight of methyl acrylate, 5 to 90 parts by weight of water,
An acrylic polymer composition obtained by uniformly mixing 30 parts by weight and a foaming control nucleating agent, such as 3 to 15 parts by weight of talc, is heated and melted under autogenous pressure or higher pressure, and then passed through a spinning orifice. It is manufactured by a method such as extrusion into a normal pressure region through a foam fiber.

Next, in order to obtain the woven fabric of the present invention, first, the foamed fibers of the acrylonitrile polymer obtained above are woven using a common plain loom, such as a rapier loom. The obtained fabric has a thickness of approximately 1.5 mm and has no cushioning properties. This fabric with no cushioning properties,
Next, by immersing the fabric in boiling water, taking it out from the boiling water, and cooling it at room temperature, the fabric of the present invention with excellent cushioning properties can be obtained.

Fig. 1 is a perspective view of a special fabric showing an example of the present invention, showing a state in which single yarns 2 with large amplitude are uniformly floating on the surface, and although it is not visible in Fig. 1, the back side is also visible. Single yarn 2 is uniformly raised. Also, in Figure 1, the single yarn 1 with a small amplitude appears to be sinking, but compared to the single yarn with a large amplitude, it is a feature of the present invention that it is uniformly raised, although there are differences in degree. , thereby exhibiting extremely good cushioning properties.

FIG. 2 shows a cross section taken along line A-A' in FIG. indicates a single yarn with small-amplitude waviness, which is sunk from the front and back surfaces of the single yarn 2, but shows that the peaks and valleys of each yarn are uniformly raised without contacting each other.

FIG. 3 shows a cross section taken along line B-B' in FIG. 1, showing that the sinusoidal single yarn 1 with a small amplitude is uniformly raised, and the single yarn 2 with a large amplitude waviness. indicates that it is uniformly raised on the front and back surfaces.

Here, regarding the amplitude of the single yarn of the present invention, the amplitude/
The diameter of the single yarns is preferably 0.5 to 5.0; if the diameter is less than 0.5, the cushioning properties will be weakened, and if the diameter is more than 5.0, the ability to hold the single yarns together will be lost, resulting in a fabric with many gaps, which is not practical. Furthermore, the diameter of a single yarn in the present invention refers to the diameter of a single yarn in a direction perpendicular to the surface of the fabric.
Further, it is preferable that the single threads of either warp or warp threads are uniformly raised on the front and back surfaces; otherwise, the fabric surface will be uneven and the fabric will not be of practical use.

The present invention will be explained in more detail below.

Polyacrylonitrile foam synthetic fiber (flat shape, major axis 5 mm, minor axis
When a plain woven fabric (thickness 1.5 mm) of 0.5 mm) is placed in boiling water for about 2 minutes, pressure is generated in the foamed part of the polyacrylonitrile foam fiber, and the polyacrylonitrile foam fiber heated above the glass transition temperature At this time, the woven fabric has a large tension in one of the warp and warp yarns (there is a difference in tension between the warp and weft), so the single yarn in the direction with lower weaving tension slightly succumbs to the foaming pressure. , the foaming increases and becomes the source of a sinusoidal single yarn with a large amplitude, while the single yarn in the direction of high weaving tension does not foam as much and becomes the source of a sinusoidal single yarn with a small amplitude. After that, by taking it out from boiling water, the polyacrylonitrile foam fiber shrinks, and the one that slightly succumbed to the foaming pressure during foaming becomes a single yarn with sinusoidal undulations of large amplitude, while the other The result is a single yarn with sinusoidal undulations of small amplitude.

A fabric with excellent cushioning properties is obtained in which the diameter of the single yarn is 1 mm, the amplitude of the sinusoidal curve of the single yarn with large amplitude is 4 mm, and the amplitude of the sinusoidal curve of the single yarn with small amplitude is 1.5 mm. Ta. In this way, the amplitude/
A woven fabric composed of single yarns having sinusoidal undulations with diameters of 4.0 and 1.5, respectively, is a woven fabric with high cushioning properties in which the single yarns are uniformly raised in the present invention. It was hot.

The fabric obtained in this way has a raised structure, so it has excellent cushioning properties, and the skin layer of the fabric has a wrinkled structure, giving it a refreshing feel. In addition, it has a good foam structure, so it has excellent heat retention, and due to the wettability of the acrylonitrile polymer, it has appropriate water absorption and hygroscopicity. It is highly practical and is widely used as a material for rugs, wall coverings, bags, etc.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the special fabric of the present invention, FIG. 2 is a cross-sectional view taken along line A-A' in FIG. 1, and FIG. 3 is a cross-sectional view taken along line B-B' in FIG. 1...Single thread (warp or weft), 2...Single thread (weft or warp).

Claims (1)

[Claims for Utility Model Registration] (1) A woven fabric made of foamed fibers of acrylonitrile polymer, in which single yarns having sinusoidal undulations of different amplitudes are formed at each peak and valley. A special woven fabric characterized by intersecting single threads on either side of the warp and warp that are uniformly raised on the front and back sides. (2) The special fabric according to claim 1, wherein the amplitude/diameter of single yarn is 0.5 to 5.0.