JPH0644881B2 - Inner boots for ski shoes - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to inner boots for ski shoes, and more particularly to inner boots that fit perfectly in any foot shape.

[Conventional technology]

As shown in FIG. 1, a ski shoe generally comprises a combination of an outer shell 1 and an inner boot 2 made of synthetic resin.

The inner boot 2 is conventionally known to be composed of a backing cloth and an outer layer of a polyurethane foam, and in order to prevent the polyurethane liquid from penetrating into the inner surface of the backing cloth, a sealing treatment is previously applied to the inner surface of the backing cloth. Using the applied back cloth, sew this back cloth into a foot shape, then load it into the mold, and pour the polyurethane liquid between the back cloth and the mold from the edge of the mouth of the back cloth, and foam it to form one piece. Molded.

Further, if the inner surface of the back cloth is subjected to the sealing treatment in this way, the adhesive area between the back cloth and the polyurethane foam is small at the periphery of the mouth opening portion, so that the peripheral edge has a practically required adhesive strength. Therefore, a large number of small holes are lined up in the periphery of the mouth opening of the back cloth, and the polyurethane foam is filled up to these small holes to increase the bonding area of the periphery of the mouth opening. There is also provided an inner boot that retains practical strength that does not peel off even when shearing or shearing stress is repeated during use (see Japanese Utility Model Publication No. 62-7127).

[Problems to be Solved by the Invention]

In each of the above inner boots, the polyurethane foam is interposed between the outer shell 1 and the foot of the skier wearing the ski shoe, and elastically deforms to fit into a foot shape.

However, it is extremely difficult to completely fit all the foot shapes of a large number of skiers having various foot shapes only by elastic deformation of the polyurethane foam.

In order to better fit many foot shapes,
It is conceivable to increase the thickness of the polyurethane foam.

However, if the thickness of the polyurethane foam increases, not only does the outer shell 1 increase in size, but it is difficult for the skier's delicate foot movements to be accurately and quickly transmitted to the ski, and the original function of the ski shoe is impaired. There is.

It is an object of the present invention to provide inner boots for ski shoes in which the thickness of the polyurethane foam is appropriately suppressed and the foot is completely fitted in any foot shape.

[Means for Solving the Problems]

The present invention sew a back cloth subjected to a sealing process into a foot shape,
If the glass transition point (hereinafter referred to as Tg) is 25 ° C or higher, T
An inner boot of a ski shoe, comprising a polyurethane foam layer having an elastic modulus ratio of 40 or more at g ± 10 ° C. provided on the outer side of the back cloth.

[Action]

The inner boot according to the present invention has a polyurethane foam layer provided on the outer side of the backing cloth in a rubber region having a temperature higher than Tg and a temperature lower than the softening point by being heated by a heating means such as a dryer or in a high temperature region around the stove. With a relatively low elastic modulus, the skier inserts his or her foot and deforms it so that it fits in the foot shape, and then let it cool down or blow cold air to cool it to a temperature lower than Tg and fix the above shape. In addition, it ensures a relatively high elastic modulus state of the glass region suitable for use. When used by other skiers, the person's foot shape can be fixed by the above procedure, so that the skier can always use the ski shoes in a state in which he / she fits his / her foot shape.

Specifically, the inner boots according to the present invention, when inserted in the outer shell, have a high temperature such as a handy dryer used when drying the hair of a person or the like around the stove of a ski inn. A person who uses it after migrating it to a rubber region having a temperature higher than Tg in a high temperature range (about 40 to 50 ° C.) and returning it to the initial shape memorized at the time of molding or by heating it outside the outer shell to restore the original shape. Inserts his foot and presses it with the buckle of the outer shell to transform it into the person's foot shape (the stress at that time is 0.1 to 2.0 kgf /
cm ² ), while maintaining this state, by cooling to a temperature lower than Tg, the above-mentioned shape can be fixed and a high elastic modulus suitable for use can be secured, and it fits the user. Moreover, it is possible to provide the inner boots having a good usability. Therefore, Tg needs to be set to a temperature higher than the inner surface temperature of the outer shell on snow or the surface temperature of the foot during skiing (about 25 to 30 ° C.).

In addition, in order to facilitate the extraction of the foot after the above-mentioned deformation and fixation, the inner boot has a fitting portion (see FIG. 1) near the fitting portion (1 ′ in FIG. 1) of the outer shell and other appropriate places. 2 ') may be provided. In addition, a detaching means such as a velcro tape may be provided at this mating portion.

Further, in the case of the integral boot type having no such a mating portion as described above, the T
It can also be heated to a temperature above g to provide a low modulus rubber region to facilitate paw withdrawal. However, in this case, even when used by the same person, it is necessary to fix the foot shape by the above procedure when wearing the ski boots.

In order to obtain a good feeling of use, the inner boot of the present invention generally has an apparent elastic modulus of the polyurethane foam layer of 2 or less.
Considering the above-mentioned immobilization of the foot shape and ease of operations such as withdrawal of the foot, the Tg of the polyurethane constituting the foam layer is 25 ° C or higher and Tg ± 10 ° C.
It is necessary that the elastic modulus ratio in is 40 or more.

Polyurethane foams having the above shape memory properties, Tg, and elastic modulus include 1) types of isocyanate, 2) types of polyol, 3) types of chain extender, and 4) polyurethanes in which the compounding ratio of these is appropriately adjusted. An appropriate amount of a general foaming agent (volatile solvent) is blended with the above, and used. As a rough guide, as a polyurethane, a molecular weight of 160-
About 310 diisocyanate 1.2 to 1.85 mol: polyol with a molecular weight of about 400 to 2000 0.8 to 1.0 mol: chain extender with a molecular weight of about 60 to 360 about 0.2 to 0.85 mol, and as a foaming agent, trichloromonofluoromethane (R-11), trichloromonofluoromethane (R-
113), methylene chloride and the like can be used, and the amount thereof used varies depending on the degree of foaming of the polyurethane foam, for example, about 20 times as much as 100 parts by weight of 20 times foaming (ρ = 0.05) polyurethane.

〔Example〕

[1] Preparation Example of Polyurethane (15, 27, 3 in Table 1)
The examples excluding 8, 39 and 40 are reference examples. ) [2] Manufacturing Example of Inner Boots A back cloth made of a knitted fabric that has been sealed is sewn into a foot shape as shown in FIG. At this time, a mating portion 21 'is formed on one side of the ankle and the upper part of the back cloth 21.

This is set in a mold (not shown), and 20 parts of trichloromonofluoromethane (R-11) as a foaming agent is added to 100 parts by weight of polyurethane No. 38 in Table 1 between the mold and the inner boots. Part of the stock solution is poured, and the mold is heated and foamed to integrally form a polyurethane foam layer on the outside of the back cloth. It should be noted that release paper or the like is attached in advance so that the polyurethane foam layer is not formed inside the mating portion 21 '.

If the polyurethane foam layer is integrally molded as described above, remove it from the mold, remove the release paper, etc.
Inner boots are manufactured by attaching Velcro tape or the like to 1 '.

[3] Example of use of inner boots As shown in FIG. 3 (A), inner boots 2 (a back cloth 21 and
Consisting of a polyurethane foam layer 22 with a thickness of 5 to 15 mm)
Insert.

Next, hot air is blown into the inner boots 2 by the dryer 4 from the openings of the inner boots to heat the polyurethane foam layer 22 to a temperature higher than Tg and move to a rubber region having a low elastic modulus. In the rubber region where the polyurethane foam layer has a low elastic modulus (the back cloth can be easily pressed and detected by finger pressure or the like to detect and confirm the state), the foot 5 is inserted into the inner boot 2, and the buckle of the outer shell 1 (first 3 in 1)
And cool to a temperature lower than Tg (the fixed state of the foot can be easily detected and confirmed by pressing the back cloth with finger pressure or the like).

After that, with the inner boot 2 left inside the outer shell 1, when the foot is removed from the mating portion 1'of the outer shell 1 and the mating portion 2'of the inner boot 2, the foot shape is fixed as shown in FIG. It becomes inner boots 2 that did.

Prior to skiing, insert your foot into this inner boot 2 and stop the buckle 3 of the outer shell 1 so that the inner boot 2 fits perfectly on the skier's foot 5, and you should wear your ski shoes with a good feeling of use. You can enjoy

[Effects of the Invention] According to the present invention described above, it is possible to provide inner boots fitted to each skier's foot shape without unnecessarily thickening the polyurethane foam layer (about 5 to 15 mm is sufficient). it can. (It should be noted that the thickness of the polyurethane foam layer is not limited to the above-mentioned 5 to 15 mm, and may be thicker locally or entirely if necessary).

As a result, it is not necessary to increase the size of the outer shell, and the delicate movement of the foot of the skier can be accurately and quickly transmitted to the ski.

Further, the apparent elasticity of the polyurethane foam when using the inner boots is appropriate, and a good feeling of use can be provided.

The apparent elastic modulus of the polyurethane foam can also be freely adjusted by the foaming degree of the polyurethane, and the apparent elastic modulus can be made to match the skier's level (such as stress on the foot during skiing) and weight. .

[Brief description of drawings]

FIG. 1 is a diagram showing the structure of a ski shoe, FIG. 2 is a diagram showing an example of a state in which the inner cloth of the present invention is sewn into a foot shape, and FIGS. 3 (A) and 3 (B) are the present invention. FIG. 4 is a view showing an example of using the inner boot of FIG. 4, and FIG. 4 is a view showing a state in which the inner boot of the present invention remembers the shape. 1: Outer shell, 2: Inner boot 3: Buckle, 21: Lining cloth 22: Polyurethane foam layer 4: Hair dryer, 5: Feet

Claims (1)

[Claims] 1. A backing cloth subjected to a sealing treatment is sewn into a foot shape and has a glass transition point of 25 ° C. or higher and a glass transition point of ± 10.
Inner boots for ski shoes, wherein a polyurethane foam layer having an elastic modulus ratio at 40 ° C. of 40 or more is provided on the outside of the back cloth.