Protective shoe toecap made of long fiber reinforced thermoplastic resin and manufacture thereof

Abstract

A method for the production of a toe cap for a safety shoe comprises placing a fibrous pellet material of a long fiber-reinforced thermoplastic resin in a pseudo-forming mold, compressing the fibrous pellet material therein under application of heat to primarily form a pseudo-toe cap, setting the resultant pseudo-toe cap in position in a mold for forming a toe cap for a safety shoe, and applying pressure and heat to the pseudo-toe cap to compression mold a toe cap for a safety shoe. By this method, there is obtained the toe cap made of a long fiber-reinforced thermoplastic resin in which the proportion of the content of reinforcing fibers in a skirt part to that in a main body part is in the range of 70 to 100%.

Description

technical field [0001] The present invention relates to toe caps or toe caps for use in protective footwear, such as shoes and boots, for structurally reinforcing the toe of the shoe, and methods of making the same And improve the safety of shoes. technical background [0002] For the toe cap of protective shoes, heretofore, the important point is the strength of the upper part of the shoe which protects the wearer's toe from unexpected strong impacts. Therefore, the toe cap made of steel was used in the previous actual use. However, protective shoes using a toe cap made of steel have to be accompanied by a problem that the use of steel as a material of the toe cap inevitably increases the weight of the protective shoe, which hinders the movement of the wearer. For this reason, toe caps made of thermoplastic resin reinforced with reinforcing fibers such as glass fibers have been developed to reduce the weight of protective shoes. [0003] Heretofore, toe caps for protecti...

AI Technical Summary

Problems solved by technology

[0005] (1) Since the material is a sheet including resin and reinforcing fibers, the production cost becomes high

[0006] (2) Since the material in sheet form must be plasticized again by thermal melting, the material tends to be oxidized and thermally deteriorated

Therefore, it is difficult to automate and rationalize

[0008] (4) Due to the cutting step of the sheet, the output of the material is reduced

Also, scrap rates tend to increase due to misalignment when placing the sheet into the forming die after fusing

[0009] (5) Due to the difference in shape between the core (convex) and the cavity (concave) of the forming die, it is difficult to design the toe cap arbitrarily, especially the curved part

[0010] (6) The use of sheets to adjust the weight of sheets can cause problems such as welds in formed articles or strength drops or changes in toe caps

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