JP2006158600A - Shoe sock liner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shoe sock liner, when being worn, reacting to the body temperature of a person wearing a shoe and changing its hardness without using a heating device such as a constant-temperature bath, a dryer, hot water and the like, when being softened, fitted to the shape of the foot of the person wearing the shoe, and improving usability when being worn, the comfort and durability. <P>SOLUTION: This shoe sock liner formed by sticking a surface material 4 on the upper face of a foam body 3 and sticking a cushion material to the lower face, is characterized in that the foam body 3 is constituted of a shape memory resin material, and a glass transition point Tg of the shape memory resin material is set to a value close to the body temperature. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a shoe insole that forms the sole of a shoe.

  Conventionally, shoe insoles include polyethylene foam and polyurethane foam with a cushioning material such as cross mesh or EVA, but these are intended to alleviate impact during walking. Fit is not considered. Considering the fit to the foot, cork material is used as the base and the shape of the sole and the base of the foot and between the toes of the foot and between the toes, and gel-like material in an oven or microwave oven Some are heated and softened to fit the shape of the foot.

  In conventional shoe insoles, the materials that make up the shoe insole are selected from materials that have rigidity and elasticity, considering relaxation of impact and comfort during walking, and considering the fit. There are things that match the shape of the back of the body, but it is most important to fit the user's feet firmly in order to have high fit and sufficiently satisfy the impact resistance and comfort when walking .

However, since the shape of the foot varies depending on the user and varies in various ways, even if the material of the shoe insole is selected from the above viewpoint, the shoe insole manufactured in one specific size and shape is used. However, there is a limit to supplying a user with an unspecified number of users so that the user can use them. In addition, making a shoe insole tailored to each has a problem in terms of productivity and cost.

  Up to now, there have been proposed ones in which the heel portion of the outer periphery of the shoe is formed of a block copolymer (refer to Patent Document 1), and the shoe sole is formed of a shape memory foam synthetic resin material (refer to Patent Document 2). ing. The present invention proposes an improved feeling of use and comfort as compared with the above proposed example.

Japanese Patent Laid-Open No. 7-148005 (FIG. 1) Japanese Utility Model Publication No. 7-20808 (FIG. 1)

The present invention does not use a heating device such as a thermostatic bath, a dryer, hot water or the like when wearing shoes, but changes its hardness in response to the body temperature of the person wearing the shoe, and when the shoe softens, The object is to propose a shoe insole that fits the shape of each foot, and that has improved usability, comfort and durability when worn.

  In order to solve the above problems, the present invention proposes the following means (1) to (6).

(1) The shoe insole according to the first means is a shoe insole in which a skin material is attached to the upper surface of the foam and a cushion material is attached to the lower surface. The glass transition point (Tg) of the shape memory resin material is set in the vicinity of body temperature.
The vicinity of the body temperature is a temperature range of 33 ° C. to 40 ° C., which is a human standard body temperature.
In addition, the said skin material may be a general purpose thing and should just use what is familiar to a human body, such as a cross mesh, leather, and cotton cloth. Moreover, as said cushion material, what is necessary is just a cushion functional material currently used widely, such as ethylene vinyl acetate resin (EVA) and synthetic rubber.

(2) The second means is characterized in that, in the shoe insole according to the first means, the shape memory resin material is made of polyurethane.

(3) third means, in the shoe insole according to the first or second means, in which the density of said shape memory resin material, characterized in that it is in the range of 40kg ^/ cm ³ ~90kg ^/ cm 3 is there.

(4) The fourth means is 5 KPa when the hardness of the shape memory resin material is distorted by 25% at an atmospheric temperature of 55 ° C. in the shoe insole according to any of the first to third means. It is characterized by being in the range of ˜20 KPa.

(5) The fifth means is that when the strain of the shape memory resin material gives a load of 0.017 kg / cm ² at an atmospheric temperature of 55 ° C. in the insole according to any of the first to fourth means. , 30% to 60%.

(6) A sixth means is a shoe insole according to any one of the first to fifth means, wherein the shape memory resin material has a loss coefficient (Tanδ) in the range of 0.6 to 1.0 in the glass transition region. It is characterized by that.
In addition, the shoe insole of each said means is a thing of the concept containing the thing which attached the insole to the sole of a single thing and a sole as an insole.

  The invention according to each claim described in the claims employs the means described in the above (1) to (6), and therefore has the following effects.

Since the shoe insole according to the present invention is configured as described above, it can be applied to a user with different foot sizes and shapes by utilizing the characteristics of the shape memory resin material constituting the main body. Can fit tightly.
That is, the present invention utilizes the fact that the elastic modulus of the shape memory resin material changes greatly at a temperature around the glass transition point (Tg), and the rubber state is changed by heating to a temperature above the glass transition point. It can be deformed and stretched freely from the original molded shape, so it can be fitted to the foot firmly by deforming according to the size and shape of the user's foot while wearing shoes, The shape is ready.

In addition, since the glass transition point (Tg) of the shape memory resin material is set near the body temperature, the elastic modulus of the foam portion is lowered and softened by the body temperature without using an external heat source such as a thermostatic bath, a dryer or hot water. It is naturally deformed by the weight of the user and fits securely to each user's foot. In addition, since the shape transition resin glass transition point (Tg) when wearing shoes is in the glass transition region and the loss coefficient Tanδ at this time is in the vicinity of 1, the impact relaxation characteristics during walking are also good.
Furthermore, since polyurethane is used as the shape memory resin material, the glass transition point can be easily set, and the optimum glass transition point can be obtained.

    Embodiments of the present invention will be described below with reference to FIGS.

  1 (a) and 1 (b) show the structure of a shoe and an insole according to each embodiment of the present invention, (a) is a lateral sectional view of the shoe, (b) is a longitudinal sectional view of the shoe, (C) is a C arrow directional cross-sectional view of (a). FIGS. 2A and 2B show usage states according to the respective embodiments of the present invention. FIG. 2A is a longitudinal sectional view and FIG. 2B is a lateral sectional view.

In FIG. 1, reference numeral 1 denotes a shoe, and 2 a shoe insole, which is incorporated in the shoe 1. The shoe insole 2 has a two-layer integrated structure in which a nylon cloth mesh (skin material) 4 is attached to a portion (upper surface) that touches a foot with the foam 3 facing down, and is assembled on a shoe sole 6. A cushion material 5 is attached to the upper surface side of the shoe sole 6.
The foam 3 of the shoe insole 2 is made of a shape memory resin material, foamed into a slab shape, cut into a predetermined size, affixed with a nylon cloth mesh 4, and then molded into the shape of a shoe insole. After unplugging, it is assembled in the shoe 1.

  As shown in FIG. 2, when the user wears the shoe 1, the user uses the shoe 7 with the sole 7 in direct contact with the shoe insole 2. The shape memory resin material of the foam 3 has a glass transition point (Tg) in the vicinity of body temperature, that is, the glass transition point (Tg) of the shape memory resin material is a human body temperature of 33 ° C. to 40 ° C. Therefore, when the user puts on the shoe 1, the elastic modulus decreases rapidly due to the user's body temperature and presents a rubbery state. And fits securely to the shape of each user's foot.

  Hereinafter, insoles according to other embodiments will be described with reference to FIGS. 1 and 2.

In the insole 2 having a two-layer structure of the foam 3 and the nylon cloth mesh 4 used in Example 1, an insole that fits the shape of each user's foot was obtained. A phenomenon occurs in which the cells of the foam 3 are damaged and broken by contact and rubbing between the shoe 3 and the shoe sole 6.
In Example 2, as shown in FIG. 1 (c), a three-layer integrated structure in which a cushion material 5 made of EVA is attached to the shoe sole side (lower surface side) of the shoe insole 2 is assembled on the shoe sole 6. . By integrating the EVA cushion material 5 on the shoe insole 2, the durability of the foam 3 on the shoe sole 6 side is improved and the impact relaxation characteristics are also positively affected.

The shoe insole 2 of the present embodiment has a foam 3 placed in the middle, a nylon cloth mesh 4 attached to a portion (upper surface) that touches a foot, and a cushion material 5 made of EVA attached to a shoe sole 6 side (lower surface) 3 It consists of a layer-integrated structure and is punched into the shape of the shoe insole 2 and then assembled on the shoe sole 6.
The punched cross section (the outer peripheral side surface of the shoe insole) of the shoe insole 2 of this example, which was punched into the shape of the shoe insole 2 (foot type), was the same as before the EVA cushion material 5 of Example 2 was attached. Rub and wear with the bottom 6 surfaces. Therefore, it was confirmed that the durability of the punched section was improved by using the shoe insole 2 coated with the SBR and butyl rubber adhesive as the cover material on the punched section.

  In this embodiment, the shoe insole 2 having the structure of any of the above embodiments is integrally incorporated only in the heel portion and the toe portion of the shoe sole 6. The thing of the present Example incorporated in the heel part and the toe part of the shoe 1 is naturally deformed by the body temperature and pressure of the user like the above-mentioned shoe insole 2 and fits securely to each user's foot. To do. Even if the size of the user and the shoe 1 is not completely the same, the fit of the user and the shoe 1 is improved by attaching the product of this embodiment to the inside of the shoe sole 6, so that the shoe does not easily rub and has a good comfort. can get.

  Each shape memory resin material of the foam 3 is composed of 50 to 60 parts of tolylene diisocyanate and 1 to 4 parts of ion-exchanged water, 100 parts of polyether polyol (molecular weight 700, triol), an amine-based foam stabilizer By stirring and mixing in the presence of a catalyst, a foam 3 having a shape memory function can be obtained.

Further, the density of the shape memory resin material of the foam ^{3 is in} the range of 40 kg / cm ^{3 to} 90 kg / cm ³ , and the hardness is 5 KPa when strained by 25% at an atmospheric temperature of 55 ° C. The thing of the range of -20KPa is preferable. Further, when the distortion of the shape memory resin material of the foam 3 is a load of 0.017 kg / cm ² at an atmospheric temperature of 55 ° C., the loss coefficient (Tan δ) is in the range of 30% to 60% in the glass transition region. What exists in the range of 0.6-1.0 is preferable.

  As described above, since the shoe insole 2 according to each of the above embodiments is formed of the shape memory resin material in the foam 3 part of the portion that receives the foot (weight), the size and shape of the foot are different. For an unspecified number of users, it is possible to fit firmly according to the unevenness and shape of the sole of the foot. And since the shape memory resin material at the time of shoe wear exists in a glass transition area | region, since the loss coefficient at that time is near 1 and is large, the impact relaxation characteristic at the time of a walk also becomes favorable.

  Therefore, since the insole 2 manufactured in one specific size and shape can be used by an unspecified number of users without a sense of incongruity, and there is also an impact mitigation characteristic during walking, the function of the insole 2 is achieved. It can be fully exerted. Also, a three-layer or two-layer structure of foam 3 and nylon cloth mesh (skin material) 4 and / or cushion material 5, and further, those structures are stored in shoe sole 6 or attached to the upper surface of shoe sole 6. By integrating, it is excellent in the feeling of use and comfort when worn, and has improved durability.

  The present invention is not limited to the above-described embodiments, and can be appropriately modified as necessary. In addition, each component in the embodiment includes those that can be easily assumed by those skilled in the art and those that are substantially the same.

BRIEF DESCRIPTION OF THE DRAWINGS (a) is a cross-sectional view showing a shoe insole according to each embodiment of the present invention, (b) is a cross-sectional view in the vertical direction, and (c) is a cross-sectional view taken along the CC line in (a). (A) is a horizontal direction sectional view explaining the use condition of the shoe insole which concerns on each Example of this invention, (b) is a longitudinal direction sectional view.

Explanation of symbols

1 Shoes 2 Insoles 3 Foam 4 Nylon cloth mesh (skin material)
5 Cushion material

Claims (6)

  In a shoe insole with a skin material affixed to the top surface of the foam and a cushion material affixed to the bottom surface, the foam is composed of a shape memory resin material, and the glass transition point (Tg) of the shape memory resin material is Shoe insole, characterized by being set near body temperature.   The insole according to claim 1, wherein the shape memory resin material is made of polyurethane. Shoe insole according to claim 1 or claim 2 density of said shape memory resin material, characterized in that it is in the range of ^{40kg / cm 3 ~90kg / cm 3} . When the hardness of the shape memory resin material is distorted by 25% at an atmospheric temperature of 55 ° C., 5 KPa The insole according to any one of claims 1 to 3, wherein the insole is in a range of -20 KPa. The distortion of the shape memory resin material is in a range of 30% to 60% when a load of 0.017 kg / cm ² is applied at an atmospheric temperature of 55 ° C. Shoe insole as described in   The insole for a shoe according to any one of claims 1 to 5, wherein a loss factor (Tanδ) of the shape memory resin material is in a range of 0.6 to 1.0 in a glass transition region.

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