JPH08299626A - Multi-layer cushion material - Google Patents

Abstract

PURPOSE: To provide a multi-layer cushion material resolving such defects that the stuffy feeling and pains, and an impediment to bloodstream by stress concentration, are liable to occur while it is worn and excellent in stress dispersion. CONSTITUTION: Woven/knitted layers and urethane foam layers are laminated and covered with a side texture to form a cushion material. At least part of the fibers of the woven/knitted layer is made of a yarn having the single yarn fineness of 100-1000 denier, the thickness of 5-40mm, the air permeability of 20-300cc/cm<2> /sec, and the 25% compressive hardness of 5-50kg. The urethane foam layer has the thickness of 10-60mm and the 25% compressive hardness of 5-50kg.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multilayer cushioning material which is resistant to stuffiness when worn and has excellent stress dispersion. For example, it can be used in fields requiring breathability and stress dispersibility, such as bedding for elderly people or hospitals used for a long time, vehicle seats, wheelchair seats, and the like.

[0002]

2. Description of the Related Art As a conventional cushioning material, a cardboard-like cushioning material having a flat surface (Japanese Patent Laid-Open No. 32-19494)
No. 8) or a flat back side ground structure and a mesh or a flat front side ground are connected by a connecting thread (Jpn.
No. 9), which is made thicker by using a woven fabric (actual fairness 5
No. 76388), short fibers are combined using a low melting point component to form an aggregate (Japanese Patent Laid-Open No. 5-76388), and a three-dimensional structured fabric has a multi-woven structure and uses high shrinkage yarns as warps. (JP-A-6-128837) and the like are known. However, when the conventional cushioning materials are worn for a long time, the stress is insufficiently dispersed in any of the cushioning materials, resulting in blood retention and numbness, and for bedridden persons, it may progress and cause bedsores.

Since the plate-shaped cushioning material on the corrugated board is not multi-layered, it is difficult to obtain the thickness. For this reason, when worn, the amount of deformation is small and it is difficult to partially deform depending on the shape of the body, especially when hard parts such as bone parts of human body or protruding parts are concentrated. Since the cushioning material is crushed, the moving layer of air is reduced and it tends to get damp.

In the case where a flat backside ground structure is connected to a mesh or a flat front side ground, stress concentration occurs due to its thin thickness, and the space for ventilation is small, so that it easily gets damp.
There is also a problem that one step for overlapping and connecting with a connecting thread is increased, and that it is difficult to sew a thick material.

A thick cloth using a knitted fabric is apt to get damp because it is difficult to obtain a ventilation space connected in both the vertical direction and the horizontal direction in terms of the structure. Further, in the case of a thick cloth, the mesh size is small and the partial space is small, so that when a hard part of the human body is hit, the stress is not relaxed by the partial deformation, so that there is a problem that stress concentrates easily.

An aggregate of short fibers has a low air permeability with a single yarn fineness and a density of a normal constitution, and therefore tends to cause a stuffy feeling when worn. In addition, when an object is partially supported due to the large number of connecting points, local deformation does not occur, stress is not dispersed, and stress concentration occurs, so that blood flow is obstructed.

[0007] In the case of a three-dimensional fabric having a multi-woven structure, it has an excellent ventilation capacity during wearing and is unlikely to cause a stuffy feeling, but its thickness is technically limited and stress dispersibility is insufficient. is there.

[0008]

An object of the present invention is to provide a multi-layer cushion material excellent in stress dispersion by solving the drawbacks such as stuffiness caused by wearing and stress concentration during wearing, which easily causes pain and obstruction of blood flow. is there.

[0009]

That is, according to the present invention, "(Claim 1)"
In a cushioning material in which a woven / knitted layer and a urethane foam layer are laminated and covered with a side material, the woven / knitted layer has at least a part of fibers composed of yarns having a single yarn fineness of 100 to 1000 denier and a thickness of 5 ~ 40 mm, air permeability 20 ~
300 cc / cm ² / sec, 25% compression hardness 5-5
0 kg and the thickness of the urethane foam layer is 10 to 60
mm, 25% compression hardness is 5 to 50 kg, a multilayer cushioning material. ".

The multilayer cushioning material of the present invention is a laminate in which a woven / knitted fabric layer and a urethane foam layer are covered with a cloth. The air permeability of the woven / knitted layer is 20 to 300 cc / cm ² / se
c. Preferably, 40 to 250 cc / cm ² / s
ec. If the air permeability is too low, a high degree of stuffiness will be produced when worn, and if the air permeability is too high, the air distribution will be too good and the person will feel cold. The thickness is 5 to 40 mm.
It is preferably 20 to 35. If the thickness is too small, the cushioning property of the whole is lowered and the hardness becomes coarse. In addition, the circulation of air during wearing becomes poor and stuffiness tends to occur. On the other hand, if it is too thick, it causes a problem of large depression when worn. The 25% compression hardness is 5 to 50 kg. 5k
If it is less than g, it will be too soft and will give a feeling of bottoming.
If it exceeds, stress distribution becomes insufficient when worn and stress concentration occurs.

The thickness of the urethane foam part is 10 to 60.
mm. It is preferably 30 to 50 mm. If the thickness is less than 10 mm, the stress dispersion will be insufficient. 60 m
If it exceeds m, the sinking becomes large, which is not preferable.
The 25% compression hardness is 5 to 50 kg. When it is less than 5 kg, a feeling of bottoming is generated, and when it exceeds 50 kg, stress dispersion becomes insufficient.

The air permeability of the cloth covering the whole is 10 cc / cm
² / sec or more is preferable. Air permeability is 10 cc / cm ²
If it is less than / sec, the movement of humidity is hindered, and a stuffy feeling occurs when worn.

The total thickness of the multilayer cushion material is 50 to 10
0 mm is preferable, and 60-80 mm is more preferable. If the total thickness of the multi-layer cushion material is less than 50 mm, stress distribution will be insufficient, causing numbness and blood flow obstruction, and 100 m
When it exceeds m, there are problems such as sinking and handling.

[0014]

EFFECTS OF THE INVENTION The multilayer cushion material of the present invention has a woven and knitted fabric layer and a urethane foam layer laminated thereon, and thus has excellent stress dispersion during wear and low stuffiness. The multilayer cushioning material of the present invention does not feel stuffy even after being worn for a long time.
In addition, because it is excellent in stress distribution, bedding for hospitals and the elderly,
It can be used in the fields of vehicle seats and wheelchair cushions.

A specific description will be given below with reference to examples. In the examples, compression characteristics, air permeability, and stress distribution were measured by the following methods.

<Compression characteristics> JISK-6401-5.
Using the compression plate described in 4.2, compression is performed at a speed of 50 mm / min until the load reaches 110 kg (350 g / cm ² ), and then the load is removed at the same speed. This method 2
Repeated times, the compression characteristics were obtained from the following equation from the compression length-stress curve drawn during the second measurement. 25% compression hardness = (sample thickness x 0.25) mm load [kg]

<Air permeability> Using JISL-1079 (Fragile type air permeability tester), air is sucked so that the differential pressure becomes 1/2 inch, and the unit area and the amount of air flowing per unit time at that time. Indicates.

<Stress distribution> A tactile sensor GSCAN system (BIG-MAT) manufactured by Nitta Co., Ltd. was used to measure the vicinity of the sacrum in the supine posture. The size of the pressure sensor is 43 cm × 48 cm, and the distance resolution is 10
mm.

[0019]

Example 1 As a woven or knitted layer, 4 denier single yarn fiber copolymerized with 13 mol% of isophthalic acid, total denier of 1000 denier, intrinsic viscosity 0.8, strength 5.5 g / d, boiling water shrinkage 50%, heat High shrinkage yarn made of polyethylene terephthalate fiber with a stress value of 0.52 g / d and polyethylene terephthalate monofilament with a thickness of 270 micron are used as warp yarn, polyethylene terephthalate monofilament yarn is used as weft yarn, and the loom is dobby multicolor multiplex. Using a beam, the resulting woven fabric at 150 ° C. for 10 minutes,
A heat-treated cloth was used. As the urethane foam layer, a sheet having a thickness of 30 mm and a compression hardness of 25% of 15 kg was used. Air permeability of side fabric is 50 cc / cm ² / sec
A woven fabric made of polyethylene terephthalate fiber was used. The obtained cushion material had less stuffiness during wearing and had excellent stress dispersibility. The characteristics of this cushion material are as shown in Table 1.

[0020]

Example 2 As a woven and knitted layer, polyester denier 250 denier / 48 filaments for the front side ground structure and polyester multifilament 50 for the back side ground structure
Using 0 denier / 96 filaments, a nylon monofilament yarn having a diameter of 0.165 mm as a connecting yarn, and using a knit layer obtained by a 14G double Russell machine manufactured by KARL MAYER, the urethane foam layer and the side fabric layer are the examples. The same thing as 1 was used. It had excellent breathability and handleability. The characteristics of this cushion material are as shown in Table 1.

[0021]

Comparative Example 1 The woven / knitted layer used in Example 1 was used alone. There was almost no stuffiness when worn, but the stress-concentrated part was observed. The characteristics of the obtained cushion material are as shown in Table 1.

[0022]

Comparative Example 2 The woven / knitted layer used in Example 2 was used alone. Breathability and handleability are good, but like Comparative Example 1,
The surface was hard. The characteristics of the obtained cushion material are as shown in Table 1.

[0023]

[Table 1]

Claims (1)

[Claims] 1. A cushioning material comprising a woven and knitted fabric layer and a urethane foam layer laminated and covered with a side material. In the woven and knitted fabric layer, at least some of the fibers have a single yarn fineness of 100 to 1.
000 denier yarn, thickness is 5-40mm,
The air permeability is 20 to 300 cc / cm ² / sec, the 25% compression hardness is 5 to 50 kg, the thickness of the urethane foam layer is 10 to 60 mm, and the 25% compression hardness is 5 to 50 kg. Multi-layer cushion material.