JPH0444523B2 - - Google Patents

Description

[Detailed description of the invention]

<Industrial Application Field> The present invention relates to a shoe insole material suitable for flat insoles, cup insoles, and the like. <Conventional technology> Shoe insole materials are intended to provide wear resistance, elasticity (shock absorption), and sweat absorption to the insole, and are made of synthetic leather, leather, leather, and woven fabric, such as flat insoles. There are known types of insoles, such as those affixed to an insole material, or those in which a surface cloth is affixed to an elastic sheet, such as a cup insole. However, since these insole materials are made by cutting each material and pasting them together, the number of materials is large and the processing is complicated.
Moreover, these insole materials have almost no function in absorbing oil and sweat, or the absorbed sweat flows back to the surface in a very short time and wets the surface, making it difficult to feel stuffy when worn. This results in unpleasant sensations such as cold and cold sensations, and the growth of bacteria causes athlete's foot and foul odors. The present inventors have developed a shoe insole material that is easy to manufacture and easy to handle, by mixing various main fibers with heat-adhesive fibers, heat-compression molding the entangled mixture, and making the main fibers into heat-adhesive fibers. A method using sheets bonded with fibers was proposed (Japanese Patent Application No. 59-68585). <Problems to be Solved by the Invention> The present invention provides an insole material using the above-mentioned heat-compression molded sheet, which has good absorbency for sweat, etc., and also maintains the surface in a dry state. The aim is to provide something that is hygienic and comfortable to wear. <Means for Solving the Problems> The present invention consists of a compression-molded product of a fiber entangled body in which the main fibers are bonded by heat-adhesive fibers,
The main fibers of the surface layer of the sheet are hydrophobic fibers with a moisture content of 1% or less and a water absorption length of less than 60 mm/hr, and the main fibers of the back layer are hydrophobic fibers with a water absorption length of 60 mm/hr.
This is an insole material for shoes characterized by containing the above hydrophilic fibers. First, the insole material sheet of the present invention basically consists of a cotton-like material or a wep laminate, which is a mixture of main fibers and heat-adhesive fibers, which are densely entangled, preferably by needle punching or fluid entanglement method. It is produced by heat-compression molding this, melting or softening the heat-adhesive fibers, and bonding the main fibers together. The feature of the present invention is that hydrophobic fibers are arranged as the main fibers of the surface layer of the sheet for insole material,
The main feature of the back layer is that it is a laminate of different types of layers that contain hydrophilic fibers as the main fibers. The hydrophobic fibers include polyolefin, polyester, polyamide, etc. with a moisture content of 1%.
and the water absorption length is less than 60 mm/hr, preferably 30
Use something less than mm/hr. On the other hand, hydrophilic fibers include natural fibers such as wool and cotton, hydrophilic synthetic fibers such as regenerated cellulose fibers and vinylon, and hydrophobic fibers such as polyester with a hydrophilic surface, which have a water absorption length of 60 mm/hr. The above fibers are used. Particularly preferable hydrophilic fibers are those that are hydrophobic in nature, but for example, they have at least a fine structure on the surface or are coated with a hydrophilic resin or the like so that the fiber has a water absorption length of 60 mm/hr. As described above, this product can be made into a product that has sufficient water absorbency as a sheet and has quick drying properties. The heat-adhesive fibers used have a softening point or melting point lower than that of the main fibers, and have the property of adhering between the main fibers when the sheet is thermally compressed.
Preferably, it softens or melts at 100 to 130°C and exhibits an adhesive function. Such fibers include fibers made of or containing polyolefin synthetic resins, copolyester resins, etc., and low-oriented fibers such as unstretched polyester fibers. Specifically, polyethylene, polystyrene, etc. Core-sheath type, bimetallic type composite fibers, undrawn polyester yarns, etc. made of polyethylene terephthalate and copolyester are known, and can be effectively used in the present invention. The mixing ratio of heat-adhesive fibers to the main fibers is
In order to give the sheet sufficient hardness, shape retention, recovery from deformation, and water absorption,
It is effective to set the content to 50 to 150% by weight. In addition,
As a sheet, it has an apparent density difference in the thickness direction,
Wearability can be improved by making the front side soft and the back side hard. The sheet of the present invention comprises a mixed web of hydrophobic fiber-based main fibers and adhesive fibers (which may be pre-entangled) and a mixed web of hydrophilic fiber-containing main fibers and adhesive fibers (pre-entangled). It can be obtained by laminating layers (which may be mixed), integrating them by needle punching or fluid entanglement, and subjecting them to heat compression molding. Such a seal in the present invention can be used as a shoe insole material with a moisture permeability of 1000 to 6000 g/m ² /24 hr, a compressive elastic modulus of 70% or more, and a water absorption rate as a sheet.
It is desirable that it be 100% or more. Moisture permeability is 1000
g/m ² /24hr or less, the pumping action (repetitive compression-relaxation action) when worn as an insole material
The ventilation effect is not sufficient, and sweat absorption and perspiration properties are not sufficient. In addition, if the moisture permeability is 6000 g/m ² /24 hr or more, the retention of sweat etc. within the sheet is poor, and even with the structure of the present invention, water absorbed by the sheet due to the pumping action flows back to the surface side, which is not desirable. . Furthermore, if the compression modulus is 70% or less, the cushioning properties when worn will be insufficient, the product will become sagging, and the pumping effect for sweat absorption will be poor. In addition, the water absorption rate of the sheet is 100
% or less, sweat absorption is insufficient and water absorbed by pumping flows back to the surface, resulting in an undesirable product. Such sheets are compression molded to have an average apparent density of 0.2 to 0.6 g/cm ³ , are mixed with 50 to 150% by weight of heat-adhesive fibers, and have fibers with a water absorption length of 60 mm/hr or more in the back layer. can be obtained when the main fiber contains 50% or more by weight. In the present invention, when a difference in apparent density is provided between the surface layer and the back layer, the surface is difficult to get wet when sweat is absorbed,
Easy to dry quickly. For this purpose, it is effective to make the apparent density of the surface layer 0.4 g/cm ³ or less, and to increase the apparent density of the back layer 0.1 g/cm ³ or more, preferably 0.3 g/cm ³ or more. In this case, the surface layer is
Since flexible felt-like cushioning properties are required, the main fiber is the main fiber, and the mixing ratio of main fiber/adhesive fiber is 55:45 to 90:10 (preferably
65:35 to 80:20) is appropriate, and the fineness is 2 to 15 dr.
It is preferable to use hollow or irregular cross-section fibers with high impact resilience. On the other hand, the back layer is mainly required to have rigidity and shape retention after molding, so the mixing ratio of both fibers is
45:55~10:90 (preferably 35:65~20:80) is appropriate, and the fineness is 6~20 dr (preferably 10~20 dr).
15dr) Hollow or irregular cross-section fibers with high impact resilience are preferred. Furthermore, in the present invention, the surface side is embossed, which not only makes it comfortable to wear, but also has an anti-slip effect.
It can improve the sweat absorption effect. Furthermore, as a method for improving the appearance, it is effective to construct the material from dyed main fibers and spun-dyed adhesive fibers. In addition, in order to further increase the hardness of the insole and to further prevent the backflow of absorbed moisture, a hydrophobic film is laminated within the sheet (preferably at or near the boundary between the surface layer and the back layer). insert)
However, it is effective to form a porous film layer within the sheet by integrating it with the fiber layer by needle punching (preferably a density of 30 to 60 pieces/cm ² ) and further melting a portion during molding. . <Functions and Effects> According to the structure of the insole material of the present invention, water vapor sweated when wearing shoes is first transferred from the surface layer of the insole to the core section through compression pressure (pumping effect). ) and is further sucked into the inner layer of the insole machine from the sole of the foot along the gradient of water vapor partial pressure within the sheet. Here, under the effect of temperature cooling, the water vapor reaches a saturation point and condenses between the fibers. The condensed water is further permeated into the insole machine and dispersed (to the insole etc.) by the cushion pressure (pumping effect) from the surface layer of the insole machine or the capillary action of the hydrophilic fibers that make up the sheet. absorption) and adsorption. On the other hand, by taking off your shoes, your shoes will dry naturally in a very short time. This quick-drying effect when putting on and taking off shoes is not only beneficial for the functionality of the shoes;
It is also effective in terms of durability. Furthermore, in the present invention, since there is a hydrophobic layer on the surface or surface layer, moisture absorbed into the insole material body does not stay on the surface and does not easily flow back. The side that comes in contact with the shoes is always kept dry, eliminates stuffiness on the feet, is comfortable to wear, and does not cause sports problems such as so-called blisters. Further, according to the configuration of the present invention, it is relatively easy to dry when not worn, and exhibits the effect of preventing the generation of bacteria and bad odor. Of course, the insole material of the present invention is easy to manufacture, can be used alone by simply cutting into the required shape, and has good workability. The moisture content, fiber absorption length, sheet water absorption, moisture permeability, and compressive elastic modulus mentioned here are measured as follows. (1) Moisture content: According to JISL1015 (2) Water absorption length of fiber: According to the glass pipe method. 6mm
Fill a φ x 150 mm glass tube with 0.75 g of cotton (after cleaning with oil) evenly, and immerse the bottom vertically in colored water.
The soil absorption length was measured after 1 hour. (3) Water absorption rate of the sheet: Cut the sheet into a certain size (7.5 x 7.5 cm), soak it in water at 20℃ for a certain period of time, and calculate the water absorption rate using the following formula.Water absorption rate (%) of the sheet =
Weight after immersion - Weight before immersion / Weight before immersion x 100 (4) Moisture permeability: Based on JISZ-0208 Cupp method (5) Compressive modulus: Calculated using the following formula. Compressive modulus (%) = TO'-T ₁ /TO-T ₁ ×100 However, TO: Thickness at initial load (240 g/cm ² × 1 minute) T ₁ ; Thickness at final load (4 Kg/cm ² × 1 minute) TO′; Thickness when returned to initial load Example 1 Main fiber: 12d × 51 hollow polyester fiber with water absorption length of 90 mm/hr, coated with hydrophilic resin on the surface
mm, the adhesive fiber is a web of 400 g/m ² of polyethylene/polyester sea-island fiber (70/30 m) mixed in a ratio of 20/80 with a basis weight of 400 g/m2, and the moisture content is the main fiber.
0.5% water absorption length 13mm/hr polyester fiber 6d x 51
mm dyed cotton, polyethylene/polyester sea-island fiber (70/30) 4d x 51mm as adhesive fiber 80/20
A web with a basis weight of 200 g/m ² mixed with cotton at a ratio of 200 g/m 2 was used as a surface layer web. Both webs are spun from card and pre-punched (punch density: 25 pieces/cm ² ), then a polyethylene film (50μ) is inserted between both webs, laminated, and finished punched from the back side (punch density: 60 pieces/cm 2 ). cm ² ) processing, hot air treatment at 140° C. for 1 minute (first stage uniform heat treatment) was performed to obtain a plate-shaped product. Then, the corresponding object was heated on both sides with infrared rays (non-uniform heat treatment with a surface temperature of 150°C on the back layer side and 120°C on the surface layer side),
Before cooling, side calender pressing was performed at a surface layer temperature of 20° C. and a back layer side temperature of 70° C. (emboss roll on the surface layer side, flat roll on the back layer side). The flat insole obtained in this way has felt-like elasticity and an embossed pattern on the surface, and is a two-layer shoe insole that is firm and rigid, and the surface remains dry for a long time. There is no backflow of absorbed moisture. Each performance is shown in Table 1. Comparative Examples 1 and 2 In Example 1, the main fiber had a water absorption length of 15
When using only hydrophobic polyester fibers with a water absorption length of 90 mm/hr as a flat insole and those using only hydrophilic polyester fibers with a water absorption length of 90 mm/hr as the main fiber, the former has the following properties:
The sweat absorbency was not sufficient, and the absorbed water became saturated in a short period of time, and the pumping action caused moisture to flow back onto the surface, making it uncomfortable to wear. . The performance is shown in Table 1. Example 2 In Example 1, a sheet without inserting polyethylene film (thickness 50 μm) between the front and back webs was made, and a shoe wear test was conducted at the same time as the sheet of Example 1. As a result, the amount of absorbed water was The backflow time (wet back detection time) was slightly shorter (400 minutes) compared to the film-inserted sheet (more than 480 minutes), but it was far superior to commercially available products with conventional technology, and the surface was dry. The feeling was well maintained.

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Claims (1)

[Scope of Claims] 1. Composed of a compression-molded sheet in which the main fibers are bonded by heat-adhesive fibers, the main fibers in the surface layer of the sheet have a moisture content of 1% or less and a water absorption length of 60 mm/hr. An insole material for shoes, comprising hydrophilic fibers with a water absorption length of 60 mm/hr or more as the main fibers of the back layer. 2. Shoes according to claim 1, which contain fibers as the main fibers of the back layer, which have a moisture content of 1% or less and whose surface has been treated to make them hydrophilic, and whose water absorption length is 60 mm/hr or more. Insole material. 3 The moisture permeability of the sheet is 1000-6000g/m ² /24hr,
Claim 1: The compressive modulus of elasticity is 70% or more.
The insole material for shoes according to item 1 or 2. 4. The shoe insole material according to any one of claims 1 to 3, wherein the sheet has a water absorption rate of 100% or more. 5. The shoe insole material according to any one of claims 1 to 4, which has an embossed surface. 6 Claims 1 to 5 consisting of a moisture permeable sheet whose back side has a higher apparent density than the front side.
The insole material for shoes according to any one of paragraphs. 7. The insole material for shoes according to any one of claims 1 to 6, wherein a porous film is integrated at or near the boundary between the surface layer and the back layer.