JPS62102707A - Cushion body - 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 [Field of Industrial Application] The present invention relates to a cushion body used for vehicle seats, bedding, furniture, etc.

[Conventional technology]

Conventionally, various materials have been used for cushions for vehicle seats, bedding, furniture, etc. For example, cushion bodies using urethane foam are known, but these have poor breathability and tend to get stuffy. In addition, natural fibers such as palm rock or synthetic cotton fibers are sometimes used, but these tend to wear out easily.

Therefore, the present inventors devised a new cushion body using polyester cotton as an alternative to the conventional traditional material and bonding the intersections of the fibers with a urethane binder. This type of cushion body has excellent breathability, is lightweight, and has excellent riding comfort.

[Problem that the invention seeks to solve]

A typical cross-sectional shape of the polyester fibers used in the above-mentioned prior art is a solid or hollow circle, as shown in FIG. 5 or 6, for example.

It has been found that when these polyester fibers are bonded to each other with a urethane binder, the bond may sag or be slightly larger than the well-known cushion body made of urethane foam, depending on the type of fibers and binder components.

[Means for Solving the Problems] The cushion body of the present invention uses polyester synthetic fibers with a flat cross-section instead of conventionally used fibers with a circular cross-section, and these fibers are bonded to each other in a three-dimensional shape. The fibers are intertwined with each other, and the intersections of the fibers are bonded with a urethane binder.

〔Example〕

The fibers used are polyester-based crimped synthetic fibers. In this example, as shown in FIG. 1, for example, the cross-sectional shape (radial cross-section) of the fiber 1 is flat;
In addition, a shape having a peak of order 2 in the major axis direction is adopted.

In this specification, in the cross section of the fiber 1, when the dimension in the major axis direction is dl and the dimension in the minor axis direction is d2, d1/
d2 is called flatness. The fiber 1 used in this example is
-For example, the thickness is 50 denier, the flatness is 4, and the length is 6.
It is a short fiber with 4II11 crimps. The state of crimping is
A zigzag mechanical crimp as illustrated in FIG. 2 is used.

Polyester cotton is made by sufficiently opening these short fibers and intertwining them three-dimensionally.

The sagging resistance of the polyester cotton made of the above-described flat cross-section fibers 1 is compared with that of the conventional cotton made of the circular cross-section fibers 1', as shown in FIG. , ゛, the shape of each fiber hole or H is as shown in 1 below. In addition, the setting resistance was evaluated according to JIS K6401 (compression set near 0°C x 22 hours).

Table 1 Urethane prepolymer (NC0%
-5.0±0.2%) of trichlene solution 1 to 7 times
0wt%). This is desoluted by centrifugal force, adjusted to a predetermined amount of impregnation, and then packed into a punched metal mold. After that, steam is blown into the mold to harden the urethane binder, and then it is removed from the mold. The density of the cushion body was 0.025 g/c1113.

The fatigue resistance of the cushion body obtained in the above process is J
Rating 13 to 14 according to IS K8401
It is 26. In the cushion body of this example, polyester cotton fibers are three-dimensionally intertwined with each other, the fibers are bonded to each other at the intersections with a urethane binder, and the surfaces of the fibers are coated with the binder component. Become. Since sufficient gaps are secured between each fiber, it has excellent breathability and is sufficiently lightweight.

Table 2 below compares the fatigue resistance of the cushion body of this example and a conventional cushion body.

In the same table, the settling resistance was evaluated according to JIS K6401.

Table 2 The cushion body of this example has a 2% to 4% improvement in fatigue resistance compared to conventional products, and is comparable to well-known cushion bodies made of urethane foam.

In carrying out the present invention, solid or hollow polyester synthetic fibers having cross-sectional shapes as shown in FIGS. 9 to 19 may be used.

In short, in the present invention, fibers having a flat cross-sectional shape and crimped are used. The crimp may consist of tucking, three-dimensional crimp or a combination thereof.

According to research by the present inventors, when short fibers with an oblateness of 2 to 6, a fiber length of 13 to 125 m, and a thickness of 6 to 80 deniers are used, the sagging resistance is improved. It has been found that more favorable results can be obtained. Moreover, as illustrated in FIGS. 10 to 19, the cross section has an uneven shape in the long axis direction (a shape in which 111 is approximately 1 to 10).
is more preferable.

The cushion body of the present invention is suitable for vehicle seats, but can also be applied to furniture, bedding, etc.

〔Effect of the invention〕

According to the present invention, in a lightweight and breathable cushion body made by binding polyester cotton fibers to each other with a urethane binder, there is a great effect in improving the resistance to sagging.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of fibers used in one embodiment of the present invention;
Figures 4 to 4 are schematic side views of fibers showing the crimped state, Figures 5 to 7 are cross-sectional views of conventional fibers, and Figure 8 is a diagram showing the relationship between each fiber and permanent strain. , FIGS. 9 to 19 are cross-sectional views showing modified examples of fibers. Applicant's Representative Patent Attorney Takehiko Suzue Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 50 - Both vehicles during compression (9/20σW) Figure 8 Figure 9 Figure 11 Figure 12 rIIJ Figure 13 Figure 18 Figure 15 Figure 17 Figure 19

Claims (3)

[Claims] (1) A cushion body characterized in that polyester synthetic fibers having a flat cross-sectional shape are three-dimensionally intertwined and the intersections of the fibers are bonded with a urethane binder. (2) The cushion body according to claim 1, wherein the fibers are short fibers having a thickness of 6 to 80 deniers and a flatness of 2 to 6. (3) The cushion body according to claim 1, wherein the cross-sectional shape of the fibers has a plurality of ridges in the long axis direction of the cross-section.