JPS6279004A - Shoe insole material - 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 <Industrial Application Field> The present invention relates to shoe insole materials such as flat insoles and cup insoles.

<Prior art> Shoe insole materials are intended to provide abrasion resistance, elasticity (shock absorption), and sweat absorption to the insole, and are made of, for example, synthetic leather, leather, leather, knitted fabric, etc. like flat insoles. 0 is known as a cup insole with a surface cloth pasted on an elastic sheet like a cup insole.

However, these insole materials are made by cutting each material,
Since the fabric is made by bonding layers together, it requires a large number of materials, and the υ0 process is also complicated.

Moreover, these insole materials have almost no function in absorbing sweat - or the absorbed sweat flows back to the surface in a very short period of time and wets the surface, causing it to dry when worn. This results in unpleasant sensations such as stuffy and cold sensations, and the growth of bacteria causes athlete's foot and foul odors.

The present invention has been developed as a shoe insole material that is easy to manufacture and easy to handle.Each pressed earth fiber is mixed with heat-adhesive fibers, the resulting entanglement is heat-compression molded, and the main fiber is heated. We proposed a sheet using adhesive fibers (patent application 1983).
-68585).

<Problems to be Solved by the Invention> The present invention provides an insole material using the heat-compression molded sheet described above, which has good absorbency for sweat, etc., and maintains the surface in a dry state. The aim is to provide products that are hygienic and comfortable to wear.

<Means for Solving the Problems> The present invention consists of a compression-molded product of a fiber entanglement in which main fibers including hydrophilic fibers are bonded by heat-adhesive fibers, and has a moisture permeability of 1000 to 6 (l OOg/ 771/24 hr
A shoe insole material, characterized in that it is a moisture permeable sheet having a compressive modulus of elasticity of 70% or more and a water absorption rate of 100% or more, and a hydrophobic thin layer is integrated on the surface or surface layer thereof. It is.

First, the moisture-permeable sheet 1, which is the main component of the shoe insole material of the present invention, is heated with the main fibers, including various natural fibers, vinylon, nylon, or hydrophobic fibers with relatively good water absorption properties, whose surfaces have been made hydrophilic. A cotton-like body or a web laminate mixed with adhesive fibers is preferably entangled and densified by needle punching or fluid entanglement method, and this tL is heated and compression molded to melt or melt the heat-adhesive fibers, Manufactured by bonding the main fibers.

The hydrophilic fibers (including hydrophilized m-fibers) used as the main m-fibers have a water absorption length of 60 cm, /11 r or more, and have a water absorption rate of 1 ('0) as a single sheet.
% or more, it is appropriately mixed with other main fibers. Especially preferred as such hydrophilic #a fibers are:
Although the wood is hydrophobic, for example, at least the surface is made into a fine structure or the surface is coated with a hydrophilic resin, etc. (-5 The water absorption length as fiber is 60 cm/hr or more.
These products can be made into products that have sufficient water absorption as a notebook and also have 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 100-1
It softens or melts at 300C and exhibits an adhesive function. Such fibers include fibers made of polyolefin synthetic resin-copolyester resin alone or fibers containing these, and low-orientation fibers such as unstretched polyester fibers.Specifically, polyethylene and polystyrene fibers are used. Also known are core/sheath type composite fibers of polyethylene terephthalate and copolyester, bimetal type composite fibers, and undrawn polyester yarns.

It can be effectively used in the present invention.

The mixing ratio of the heat-adhesive fibers to the main fibers should be on average 50 to 150% by weight in order to provide the sheet with sufficient hardness, shape retention, recovery from deformation, and water absorption. It is valid. Note that wearability can be improved by making the sheet have an apparent density difference in the thickness direction, making the front side soft and the back side hard.

Such a moisture permeable sheet in the present invention can be used as a shoe insole material, and has a moisture permeability of 1000 to 6000 gArV24hr.
It is desired that the compressive elastic modulus is 70% or more and the water absorption rate as a sheet is 100% or more. Moisture permeability is 1000
If it is less than y/dA 4 hr, the ventilation effect due to the pumping effect (repeated compression-relaxation effect) when worn as an insole material will not be sufficient, and sufficient sweat absorption and perspiration properties will not be obtained. Furthermore, if the moisture permeability is 6000 fJAIV24 hr or more, the retention of sweat and the like within the sheet is poor, and even with the structure of the present invention, water absorbed into the sheet due to the pumping action flows back to the surface side, which is not preferable. Furthermore, if the compression modulus is 70% or less, the cushioning properties during wear will be insufficient, the product will become sagging, and the pumping effect for sweat absorption will be poor. In general, if the water absorption rate of the sheet is less than 1()0%, the sweat absorption property will not be sufficient, and the water absorbed by pumping will flow back to the surface, resulting in an undesirable product. Such a sheet has an average apparent density of 0
．． Compression molded to 2~6 g/crA, mixed with 50~150 iij amount of thermal adhesive fibers, and containing fibers with a water absorption length of 60 rrm/hr or more as the main fibers of 50-fold umbrella shape or more. You can get it. If there is an apparent density difference between the front side and the back side of the sheet, the front side should be a, 4y/ctA or less, and the back side should be 0.1 y/ctA or less.
Preferably, v is greater than or equal to 3 g/cf1.

In addition, in order to significantly increase the hardness of the shoe insole and further prevent the backflow of absorbed moisture, a hydrophobic film is laminated within the sheet7 and integrated with the fiber layer by needle punching. It is effective to partially melt the porous film layer during molding to form a porous film layer within the sheet.

In the present invention, a hydrophobic layer 1- is integrated on the surface or surface layer portion of the compression-molded sheet. One of the hydrophobic thin layers is a metal thin layer formed on the surface of the sheet by metal plating, vapor deposition, or sputtering. This metal layer should be formed to such an extent that it closes the fiber gaps of the sheet without impairing the air permeability. Further, one of the other hydrophobic layers is formed as a breathable layer of hydrophobic fibers having a water content of 1% or less. As this layer, a mesh-like knitted fabric, a web, or a non-woven fabric is used. These layers are integrated with the sheet surface of the main body by adhesive or the like, or by entangling means such as needle punching.

Roughly speaking, in the present invention, the surface side is embossed to improve not only the feeling of wearing but also the anti-slip effect and sweat absorption effect.

Effects and Effects> According to the present invention, water vapor sweated by wearing shoes is
First, when you walk, the partial pressure of water vapor from the surface of the insole material to the surface side of the insole material (between the foot) and the back surface side of the insole material (between the insole) due to the hection pressure (pumping effect) of the non-woven fabric part. It is sucked into the inner layer of the insole material from the sole of the foot along the slope of the insole. 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 and dispersed into the insole material and adsorbed by the cushion pressure (pumping effect) from the surface of the insole material or the capillary action of the hydrophilic fibers constituting the sheet.

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 contact side) is always maintained in a dry barking state, 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, when not worn, it is relatively easy to dry, 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 immediately by simply cutting into the required shape, and has good workability.

Note that the moisture content of the fibers - moisture permeability, compression modulus of elasticity, water absorption length of the fibers, and water absorption rate of the sheet are measured as follows.

1) Moisture content; according to JIS L-1015 2) Moisture permeability; , II8 Z-n2os Cambu method 3) Compressive modulus; '1loIll determined by the following formula.

However, To: Thickness of initial load area 240g x 1 minute) T1: Thickness at final load 4 kv'al X1
minutes) 'vo; Thickness when returning to initial load 4) Water absorption length of fiber; Glass pipe method 0.75 g of cotton (after oil cleaning) was evenly stuffed into a glass tube of 6rrgnφ x 150wn, and the bottom was vertically closed. Soak in colored water and measure the water absorption length after 1 hour 5) Water absorption rate of the sheet; Cut the sheet to a certain thickness 7.
5 x 7.5 cm), immersed in water at 20°C for a certain period of time, and determined by the following formula. /hr hollow polyester fiber 12dX51+++m, polyethylene/polyester sea-island fiber (70/30
) 4 A web with a basis weight of 400 y/d made by blending dX51 in a ratio of 20/80 is used as the web for the back side i, and a web made by blending the same main fiber and the same adhesive property 1aW in a ratio of 80/20 +l 200 Q The web of /d was used as the web for the front side.

When spinning the front side web from the card, it is placed on a polyethylene film (50μ) on a lattice, pre-punched,
After inversion, a web for the back side was spun from the card and pre-punched. Next, this punched nonwoven fabric was reduced to a moisture content of 0.
After placing it on a knitted fabric for a surface thin layer consisting of 5% fibers and finishing punching (100 punches/c-J) from the nonwoven fabric side, 140
A hot air treatment (first stage uniform heat treatment) was performed for 1 minute at °C to form a sheet. Next, the sheet was heated on both sides with infrared rays (non-uniform heat treatment with a back surface temperature of 150°C and a front side surface temperature of 120°C), and then pressed in a drawing die with a mold temperature of 700C on the back side and a mold III fi on the front side of 20°C. Processed (cold press). Press pressure at this time is 0,4k
y/al, press time was 30 seconds.

The sheet thus obtained has the physical properties shown in Table 1, and the cup insole made of [7] has felt-like elasticity on the front side, and firm shape retention on the back side core. It had good sweat absorption (water absorption), no backflow of absorbed water was observed, and the surface was dry to the touch.

Comparative Example 1 In Example 1, polyester fiber (
A similar cup insole was manufactured using a water absorption length of 1 s wn/hr).

As shown in Table 1, this material had a low water absorption rate as an insole material, was saturated with water in a short period of time, and the absorbed water flowed back, resulting in no dry feeling on the surface.

Comparative Example 2 In Example 1, a cup insole was manufactured without integrating the polyester fiber knitted fabric for the surface material. After wearing this product, the dry feel of the surface was lost within a short time, and the absorbed water flowed back.

Example 2 The pre-punched nonwoven fabric obtained in Example 1 was then finished punched (100 pieces/cd) after being rolled up into a roll, and then nickel metal powder was applied to the low-density surface area by sputtering. After forming a metal film layer with a coating thickness of 400A, hot air treatment (uniform heat treatment) was performed under the same conditions as in Example 1, and press working (cold press) was performed using a mold preheated by infrared rays to obtain a cup insole.

The thus obtained cup insole had the physical properties shown in Table 1, and the back core had firm shape retention.

Example 3 The pre-punched nonwoven fabric obtained in Example 1 had a moisture content of 0.
A non-woven fabric for surface material made of 5% polyester fiber (fabric weight 120 Q/d) was placed on it, and a finishing punch (100 pieces/c) was placed on it.
After performing J), hot air treatment (uniform heat treatment) for 140°CXI is performed, and then the surface side temperature is reduced to 20°C before cooling.
Calendar pressing was performed at a back side temperature of 70°C (front side embossing roll, back side flat roll). The flat insole thus obtained is as shown in Table 1.

Example 4 In Example 1, a sheet was made without inserting a polyethylene film (thickness 50μ) between the front and long webs,
It was molded under the same conditions as Example 1 to obtain a cup insole. The front side of the cup insole had felt-like elasticity, and the back core had firm rigidity. As a result of a shoe wearing test, the backflow time (wet back detection time) of absorbed moisture was slightly longer (400 minutes) than when film la was inserted (more than 480 minutes), but compared to commercially available products with conventional technology. , No. 1 was much superior to No. 1, and the dry feel of the No. 1 surface was sufficiently maintained.

Comparative Example 3.4 In Example 1, finish punching was performed without placing the knitted fabric for the surface thin layer on the pre-punched nonwoven fabric in advance and the sheet was made under the same conditions. A knitted fabric for the surface thin layer consisting of 5% fiber was laminated and integrated. The cup insole obtained in this way inhibits moisture absorption due to the influence of the adhesive, resulting in a moisture permeability of 650 Q/yyi/24 Hr, and as a result of the shoe wear test, the wet hack detection time was significantly shortened (240 Q/yyi/24 Hr). On the other hand, in Example 1, a sheet was made with the composition ratio of the main fibers and adhesive fibers of the web for the back side being the same as that of the web for the front side (80/20), and a cup insole was prepared under the same conditions. I made it. The performance of the cup insole thus obtained is moisture permeability of 730 U Q/7d/24 H.
r, and the compressive elastic modulus was 63%.

As a result of the shoe wearing test, the wet hack detection time was 190
After a few minutes, the moisture permeability effect decreased significantly, resulting in discomfort when worn.

Claims (1)

[Claims] 1) Composed of a compression-molded product of a fiber entanglement in which main fibers including hydrophilic fibers are bonded by heat-adhesive fibers, and has a water vapor permeability of 1.
,000 to 6,000g/m^2/24hr, a moisture permeable sheet with a compression modulus of 70% or more and a water absorption rate of 100% or more, with a hydrophobic thin layer integrated on its surface or surface layer. A shoe insole material that is characterized by the ability to 2) The shoe insole material according to claim 1, characterized in that the main fibers include fibers having a water absorption length of 60 mm/hr or more. 3) The shoe insole according to claim 2, which contains fibers whose main fibers have a moisture content of 1% or less, whose surfaces have been treated to make them hydrophilic, and whose water absorption length is 60 mm/hr or more. Material. 4) The shoe insole material according to claim 1, 2 or 3, wherein the hydrophobic thin layer on the surface is a thin metal layer having air permeability. 5) The shoe insole material according to claim 1, 2, or 3, wherein the hydrophobic thin layer in the surface layer is a breathable fiber layer made of fibers with a moisture content of 1% or less. . 6) The shoe insole material according to claim 5, wherein the breathable fiber layer is made of a mesh-like knitted fabric. 7) The shoe insole material according to claim 5, wherein the breathable fiber layer is made of a web or nonwoven fabric. 8) Claims 1 to 8 whose surface is embossed
The shoe insole material according to item 7. 9) The shoe insole material according to claims 1 to 8, which comprises a moisture permeable sheet having a higher apparent density on the back side than on the front side. 10) The shoe insole material according to claims 1 to 9, wherein a porous film is integrated inside the sheet.