JPH0219047Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a shoe sole in which the sole of the shoe is reinforced with a fiber-reinforced thermoplastic sheet (hereinafter referred to as FRTP sheet).

Conventional technology Various reinforcing plates have been used in the soles of shoes, for example, fabrics made of carbon fiber, matte, etc. are replaced with fiber-reinforced plastics made of thermosetting resins such as epoxy resin, polyester resin, and phenolic resin. 2. Description of the Related Art Shoe soles are provided in which a reinforcing plate made of a board (hereinafter referred to as an FRP board) is built into the sole or interposed therein by adhesion or the like.

Problems that the invention aims to solve However, the FRP board made of the above-mentioned thermosetting resin has a higher flexural modulus than the urethane resin or polyamide resin used for shoe soles, so it is difficult to improve the flexibility of shoe soles. This has the disadvantage that the FRP board tends to shear and deform due to repeated bending, causing it to easily separate from the sole of the shoe. Also FRP
The resin matrix of the board has a high molecular weight, and FRP is made of thermoplastic resin such as urethane resin or polyamide resin.
When the board is insert-molded, the melting point of the FRP board is higher than that of the urethane resin and polyamide resin that form the soles, so the compatibility is very poor, and even if the FRP board is surface treated, the adhesion will not improve, making it difficult to However, excessive bending caused interfacial delamination between the sole and the FRP board.

Means to Solve the Problems The present invention aims for perfect adhesion between the shoe sole and the FRTP sheet, and has excellent elasticity, durability, bending fatigue resistance, easy adaptation to foot movements, and lightweight shoes. Provides a sole made of carbon fiber or other long fiber fabrics,
Or FRTP using the same short fiber pine as a reinforcing material
Form the sheet to be slightly smaller than the outer circumference of the outsole.

The FRTP sheet is made of a thermoplastic film sheet of the same type as the thermoplastic resin used for the outsole, carbon fiber or other long fiber fabric, or short fiber mat of the same type. Specifically, the thermoplastic film sheet has a lower molecular weight than the resin of the outsole, and is in the form of a sandwich sandwiching the fabric or mat from both upper and lower sides.

By insert molding the FRTP sheet into the outsole, the outsole side of the thermoplastic film sheet, which has a lower molecular weight than the outsole, is fused to the outsole and is completely integrated into the outsole. The bending elastic modulus of the FRTP sheet is greater than that of the outsole, and the strain that occurs in the FRTP sheet when bent is smaller than that of the outsole, making it possible to provide an extremely superior shoe sole as described below.

Effect: The sole of this invention is slightly smaller than the outer circumference of the outsole.
FRTP sheet 1 and outsole 2 are integrally molded.
FRTP sheet thermoplastic film sheet and outsole 2
Since the interface of the
It becomes highly durable. In addition, since the bending elastic modulus of the FRTP sheet 1 is larger than that of the outsole 2, the sole has excellent resilience against external forces (snapability), which is particularly useful in sports where the ball is kicked with the toe of soccer shoes, etc. Less energy loss, easier ball control, and higher ball speed. It is also highly effective in preventing deformation of shoes. moreover,
Due to the effect of the FRTP sheet 1, a shoe sole with a thinner wall thickness can withstand sufficient use than a conventional shoe sole with a thick wall, so that an innovative thin and lightweight shoe sole can be provided.

Furthermore, by dividing the FRTP sheet 1 from the toe section of the sole to the stepping section and from the stepping section to the heel section, the bending performance is dramatically improved, leading to a reduction in fatigue. Furthermore, by increasing the amount of reinforcing fibers in the FRTP sheet 1 from the stepping area to the heel area compared to the forefoot area,
It brings unprecedented dramatic effects in terms of shank effect and heel stability.

Therefore, the conventional technology required a fairly complicated structure, but when carbon fiber is used as the reinforcing fiber in the FRTP sheet 1 of the present invention,
It is possible to provide soles with excellent shock absorption ability, which is a major feature of carbon fibers, and in particular, shoes with spikes or points for golf, baseball, soccer, rugby, etc. can be provided without a feeling of bumping up.

By using transparent or translucent resin for the outsole 2, the pattern of the long fiber fabric 3 used in the FRTP sheet 1 stands out clearly, making it possible to provide a sole with an excellent appearance.

Example Embodiments of the present invention will be described with reference to the drawings.

That is, as shown in FIG. 1, a thermoplastic film sheet 4 which is the same kind of resin as the resin of the outsole 2 and has a lower molecular weight than the resin of the outsole is attached to the outsole 2 of the shoe made of thermoplastic resin.
A long fiber fabric 3 made of carbon fiber or other reinforcing fibers or a fiber reinforced thermoplastic resin sheet (FRTP sheet) 1 integrated with a short fiber mat 5 is cut into a size slightly smaller than the outer periphery of the outsole and interposed. This shoe sole is characterized by a structure in which the outsole 2 of the shoe is fused and integrated during injection molding.

That is, as an example, the FRTP sheet 1 includes a long fiber fabric 3 such as carbon fiber, glass fiber, or Kevlar fiber, or a short fiber mat 5 made of these reinforcing fibers arranged in the middle, and a urethane resin used for the outsole. ,
Thermoplastic film sheets 4, which are the same type of thermoplastic resin such as polyamide resin and have a low molecular weight, are placed in the upper and lower layers, and after being formed by compression molding, are cut into a shape slightly smaller than the outer periphery of the outsole.

The FRTP sheet is injection molded after the insert is fixed to the convex mold of the outsole mold by adsorption or adhesion, but the molecular weight of the thermoplastic film sheet 4 used for the FRTP sheet 1 is lower than the resin molecular weight of the outsole 2. Therefore, since the joint surfaces of the molded FRTP sheet 1 and the outsole 2 are completely fused, no peeling occurs even when excessive bending occurs.

In addition, the long fiber fabric used for FRTP sheet 1 is
It is preferable to orient it in the direction of ±45° with respect to the center line of the outsole.

Furthermore, in the case of short fiber mat used for the FRTP sheet 1, fiber orientation is not particularly performed.

Figure 2 is a cross-sectional view of the sole of the present invention, and shows the FRTP
This is an example showing the positional relationship between the seat 1 and the outsole 2, and this positional relationship may be upside down. Moreover, their thickness may be changed depending on the purpose.

Furthermore, examples of thick shoes such as golf shoes are shown in FIGS. 9 and 10.

Figure 3 is an example of how to reduce the weight of the sole.The adhesive part on the back of the sole is secured by about 10 to 15 mm, and the inner edge is made thinner.
In other words, EVA sponge on the top surface of FRTP sheet 1,
Adhesively fix artificial leather, rubber sponge, natural leather, etc. In this case, the thickness of the thermoplastic film sheet 4 used for the FRTP sheet 1 is from 500 μm to 1.2 μm.
It is preferable to set it to mm.

Although illustration drawings for two-color molding are omitted, a thin thermoplastic film sheet 4 with a thickness of about 300 μm is used, and after insert molding the FRTP sheet 1 during the primary molding, the bottom 2 is placed on the top surface of the FRTP sheet 1. A resin having approximately the same hardness as the resin used in the above or a resin having a higher hardness is used in the secondary molding to form the resin layer 8 by the secondary molding. In this case, the restoration effect (snapability) of the sole becomes greater.

FIGS. 5 and 6 show examples for improving bending performance, and are particularly suitable for baseball, soccer, and the like. In addition, by increasing the fiber content of long-fiber fabric or short-fiber mat from the stepping area to the heel area compared to the forefoot area, the shank effect is increased and heel stability is also improved, reducing fatigue and ensuring safety. Sexuality increases dramatically.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and Fig. 1 is a plan view of the FRTP sheet interposed on the upper surface of the sole, Fig. 2 is a sectional view taken along line A-A in Fig. 1, and Figs. 3 to 3. FIG. 6 is a cross-sectional view taken along the line A-A in FIG. 1 showing another embodiment, FIG. 7 is a cross-sectional view showing an example of the manufacturing method of a shoe sole, FIG. 8 is a cross-sectional view showing an example of an FRTP sheet,
FIG. 10 is a cross-sectional view of the main part of the golf shoe sole. 1... FRTP sheet, 2... Outsole, 3... Long fiber fabric, 4... Thermoplastic film sheet, 5...
Short fiber mat, 6... Toe part, 7... Heel part, 8...
...Soil Fuma Department.

Claims (1)

[Claims for Utility Model Registration] 1. A thermoplastic film sheet of the same type as the resin of the outsole and having a lower molecular weight than the resin of the outsole is attached to the outsole of a shoe made of thermoplastic resin, and a long length made of carbon or other reinforcing fibers is added to the outsole of a shoe made of thermoplastic resin. The long fiber fabric or short fibers made of the above-mentioned reinforcing fibers are placed between the upper and lower surfaces of the fiber woven fabric or the short fiber mat in a sandwich pattern, or placed on either side of the upper and lower surfaces. A fiber-reinforced thermoplastic resin sheet (FRTP sheet) that is integrated with the mat is cut into pieces slightly smaller than the outer periphery of the outsole, interposed, and fused together when the outsole of the shoe is injection molded. A sole featuring. 2. The shoe sole according to claim 1, wherein the FRTP sheet is continuous from the toe to the heel of the outsole. 3. The shoe sole according to claim 1, wherein the FRTP sheet is divided into a toe portion and a heel portion of the outsole. 4. Any one of claims 1, 2, and 3 of the utility model registration claim, characterized in that the fiber content of the woven fabric or mat consisting of long and short fibers of the above-mentioned FRTP sheet is increased or decreased for each part of the outsole. or the sole according to item 1.