JPH06141908A - Toecap for safety shoes and manufacturing method - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to reduce the weight of the toecap, satisfy the strength conditions sufficiently, enable mass production, avoid excessive impact, and add cushioning properties. [Structure] A plurality of thermoplastic resin sheets formed into a thin sheet containing long fibers aligned in one direction are laminated in multiple directions, and this is heated and pressed to integrally form a multidirectional reinforced resin sheet. A plurality of thermoplastic resin sheets made of different materials having different hardness and containing long fibers in which the multidirectional reinforced resin sheet is aligned in one direction. A hard layer and a soft layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a multidirectional reinforced resin sheet integrally formed by stacking a plurality of thermoplastic resin sheets containing long fibers aligned in one direction in multiple directions. The present invention relates to a molded toe core for safety shoes.

[0002]

2. Description of the Related Art Conventionally, the toecap of a safety shoe is one which protects the wearer's toe against pressure and impact by mounting the toecap of the toe portion, and it is made of leather made in accordance with Japanese Industrial Standards. For shoes (JIS T8101), for heavy work (H type)
Steel (SK7) or a metal material having a higher strength is specified for normal work (S class), but it is specified that a metal material or plastic material is used for light work (L class). Has been done. Therefore, consideration has been given to the realization of safety shoes for light work in which a metal material other than steel or a plastic material is used to reduce its weight and cost.

[0003]

If a metal material other than steel, for example, a non-ferrous metal material such as aluminum is used, it is possible to reduce the weight to about 1/3 in the case of an equivalent wall thickness. However, since the strength is lower than that of steel material, the wall thickness must be increased. Therefore, it was difficult to put it into practical use.

However, if the resin is made into a resin, the weight can be reduced to about 1/4 to 1/5 in the case of an equivalent wall thickness, and in terms of strength, a reinforced plastic containing glass fiber or the like is used. About twice the tensile strength of aluminum can be obtained, but the pressure test condition for light work (L type) is 450Kgf.
The result which fully satisfied was not obtained.

The object of the present invention is to reduce the weight of the toecap and to satisfy the strength condition sufficiently in order to improve the above problems.
It is to provide a toecap for safety shoes that can be mass-produced.

[0006]

In order to achieve the above object, the present invention is constructed integrally by stacking a plurality of thermoplastic resin sheets containing long fibers aligned in one direction in multiple directions. A toecap for a safety shoe, which is characterized by being heat-pressed and molded using a multidirectional reinforced resin sheet.

According to another aspect, the multi-directional reinforced resin sheet is formed by stacking a plurality of thermoplastic resin sheets made of different materials having different hardness and containing long fibers aligned in one direction in one direction. It is characterized in that it comprises a general hard layer and a soft layer.

[0008]

By using the toecap for a safety shoe of the present invention,
By forming a multi-directional reinforced resin sheet integrally formed by stacking a plurality of thermoplastic resin sheets containing long fibers aligned in one direction in multiple directions In addition to being lightweight, the strength conditions are sufficiently satisfied, mass production is possible, and multiple thermoplastic resin sheets made of different materials with different hardness containing long fibers in which unidirectional reinforced resin sheets are aligned in one direction are used. By forming a hard layer and a soft layer that are layered in the same direction to form an integral hard layer and soft layer, excessive impact is avoided and cushioning is added.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a schematic configuration diagram of a toecap for safety shoes, and FIG. 2 is a partially enlarged view of FIG. The toe core 1 is a multidirectional reinforced resin sheet 5 integrally formed by stacking a plurality of thermoplastic resin sheets containing long fibers 3 aligned in one direction in multiple directions.
Is formed by heating and pressurizing.

The multi-directional reinforcing resin sheet 3 is made of nylon, polypropylene (PP), polyethylene terephthalate (PET), polycarbonate (PC) or the like as the thermoplastic resin, and the long fiber material 3 is made of glass fiber, carbon fiber, or the like. Multi-directions with a wall thickness of about 1 mm to 3 mm formed by arranging aramid fibers, ceramic fibers, etc. in one direction to form a thin sheet, and stacking the thin sheets in the vertical and horizontal directions about 5 to 15 sheets. A reinforced resin sheet having a property is formed.

The toe core 1 is formed by heating and pressurizing the reinforced resin sheet 5 to bend the head portion 7 into a high arc shape and the bottom portion 9 by bending. As a result of many experiments, the strength of the toe core 1 is 500 kgf even when the thickness is 2 mm or less.
It has been clarified that it can withstand the above compression test strength.

Further, the thermoplastic resin materials in this embodiment are combined as different materials having different hardness, and for example, a plurality of thermoplastic resin sheets containing long fibers 3 are laminated in multiple directions to form an integral hard layer and soft layer. By configuring the toe core 1
It is possible to improve the strength by hardening the outer side of the body and to provide cushioning properties with good foot contact by softening the inner side. It is also easy to integrally construct a soft layer between the hard layers in a sandwich shape so that the soft layer protects the toecap 1 from crushing of the hard layer due to excessive impact.

As described above, the present invention is a safety shoe for light work, which is sufficiently suitable for practical use, is lightweight, has a softer foot contact than metal materials, and corrodes and rusts. It is non-magnetic, has good insulating properties, and it is easy to select any shape to improve strength.

The present invention is not limited to the above embodiment, but can be implemented in other modes by making appropriate design changes.

[0016]

As is apparent from the above description, the toecap for a safety shoe of the present invention is formed by stacking a plurality of thermoplastic resin sheets containing long fibers aligned in one direction in multiple directions to be integrated. By heat and pressure molding using a multi-directional reinforced resin sheet that has been structurally configured, the problems of the prior art can be effectively solved, the weight of the toecap is reduced, and the strength condition is sufficiently satisfied. Is possible. Further, a plurality of thermoplastic resin sheets made of different materials having different hardness and containing long fibers in which the multidirectional reinforced resin sheets are aligned in one direction are laminated in multiple directions to integrally form a hard layer and a soft layer. As a result, excessive impact can be avoided, and cushioning properties can be added.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a toecap for safety shoes.

FIG. 2 is a partially enlarged view of FIG.

[Explanation of symbols]

 1 Toecap 3 Long fiber 5 Multidirectional reinforced resin sheet

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[Procedure amendment]

[Submission date] April 13, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

Title: Toecap for safety shoes and manufacturing method

[Claims]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a multidirectional reinforced resin sheet obtained by stacking a plurality of thermoplastic resin sheets containing long fibers aligned in one direction in multiple directions and heating and pressing the laminated sheets. The present invention relates to a toe core for a safety shoe that is integrally formed and then molded, and a manufacturing method.

[0002]

2. Description of the Related Art Conventionally, the toecap of a safety shoe is one which protects the wearer's toe against pressure and impact by mounting the toecap of the toe portion, and it is made of leather made in Japan Industrial Standard For shoes (JIS T8101), for heavy work (H type)
Steel (SK7) or a metal material having a higher strength is specified for normal work (S class), but it is specified to use metal material or plastic material for light work (L class). Has been done. Therefore, consideration has been given to the realization of safety shoes for light work in which a metal material other than steel or a plastic material is used to reduce its weight and cost.

[0003]

If a metal material other than steel, for example, a non-ferrous metal material such as aluminum is used, it is possible to reduce the weight to about 1/3 in the case of an equivalent wall thickness. However, since the strength is lower than that of steel material, the wall thickness must be increased. Therefore, it was difficult to put it into practical use.

However, if the resin is made into a resin, the weight can be reduced to about 1/4 to 1/5 in the case of an equivalent wall thickness, and in terms of strength, a reinforced plastic containing glass fiber or the like is used. About twice the tensile strength of aluminum can be obtained, but the pressure test condition for light work (L type) is 450Kgf.
The result which fully satisfied was not obtained.

The object of the present invention is to reduce the weight of the toecap and to satisfy the strength condition sufficiently in order to improve the above problems.
It is an object of the present invention to provide a toecap for a safety shoe and a manufacturing method that can withstand excessive impact and can be mass-produced.

[0006]

In order to achieve the above-mentioned object, the present invention is to laminate a plurality of thermoplastic resin sheets, which are formed in a thin sheet shape and contain long fibers aligned in one direction, in multiple directions. A toecap for safety shoes, characterized in that the multidirectional reinforced resin sheet is integrally formed by heating and pressing this, and is molded using the multidirectional reinforced resin sheet.

According to another aspect, the multidirectional reinforced resin sheet has a plurality of thermoplastic resin sheets made of different materials having different hardnesses laminated in multiple directions to integrally form a hard layer and a soft layer. To do.

According to another aspect, there is provided a method for manufacturing a toecap for a safety shoe, which comprises the steps of: (a) a plurality of thermoplastics formed in a thin sheet containing unidirectionally aligned long fibers. First step of stacking resin sheets in multiple directions, (b) Second step of integrally forming a multi-directional reinforced resin sheet by heating and pressurizing, (c) Bending molding of the head in a high arc shape at the bottom. This is the third step.

According to another aspect, there is provided a method of manufacturing a toecap for a safety shoe, which comprises the following steps: (a) A heterogeneous material having different heights and formed into a thin sheet containing long fibers aligned in one direction. A first step of stacking a plurality of thermoplastic resin sheets each consisting of in multiple directions in a multi-direction, (b) a second step of integrally forming a multi-directional reinforced resin sheet having a hard layer and a soft layer by heating and pressing, ( C) A third step in which the head is bent in a high arc shape and the bottom is bent to form the outer side as a hard layer and the inner side as a soft layer.

[0010]

By adopting the toecap for a safety shoe and the method for producing the same according to the present invention, a plurality of thermoplastic resin sheets containing filaments aligned in one direction are laminated in multiple directions and heated and pressed. By constructing the multi-directional reinforced resin sheet integrally and then forming it, the weight of the toecap is reduced, the strength conditions are sufficiently satisfied, and mass production is possible. By superposing a plurality of thermoplastic resin sheets made of different materials having different hardness in multiple directions to integrally form the hard layer and the soft layer, it is possible to withstand excessive impact and to add cushioning properties.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a schematic configuration diagram of a toecap for safety shoes, and FIG. 2 is a partially enlarged view of FIG. The toe core 1 is a multidirectional reinforced resin sheet 5 integrally formed by stacking a plurality of thermoplastic resin sheets containing long fibers 3 aligned in one direction in multiple directions.
Is formed by heating and pressurizing.

The multi-directional reinforcing resin sheet 5 is made of nylon, polypropylene (PP), polyethylene terephthalate (PET), polycarbonate (PC) or the like as a thermoplastic resin, and glass fiber, carbon fiber, aramid fiber as the long fiber material 3. , Ceramic fibers and the like are arranged in one direction and contained to form a thin sheet.
By stacking a plurality of layers, a reinforced resin sheet having a multi-direction and a wall thickness of about 1 mm to 3 mm is formed.

The toe core 1 is formed by bending the multidirectional reinforced resin sheet 5 thus constructed by a molding machine (not shown) so that the head 7 is bent in a high arc shape and the bottom 9 is bent. It As a result of many experiments, it was revealed that the strength of the toecap 1 can withstand a compression test strength of 500 kgf or more even when the thickness is 2 mm or less.

Further, the thermoplastic resin materials in this embodiment are combined as different materials having different hardness, and for example, a plurality of thermoplastic resin sheets containing long fibers 3 are laminated in multiple directions to form an integral hard layer and soft layer. By configuring the toe core 1
It is possible to improve the strength by hardening the outer side of the body and to provide a cushioning property with good foot contact by softening the inner side. It is also easy to integrally construct a soft layer between the hard layers in a sandwich shape so that the soft layer protects the toecap 1 from crushing of the hard layer due to excessive impact.

As described above, the present invention is a safety shoe for light work, which is sufficiently suitable for practical use, is lightweight, has a softer foot contact than metal materials, and is corroded to cause rust. Without doing so, it is non-magnetic, has good insulating properties, and it is easy to select any shape for improving strength.

The present invention is not limited to the above embodiment, but can be implemented in other modes by making appropriate design changes.

[0018]

As is apparent from the above description, the toecap for a safety shoe and the manufacturing method according to the present invention include a plurality of thermoplastics formed into a thin sheet containing unidirectionally aligned long fibers. Problems of the prior art by stacking resin sheets in multiple directions, heating and pressing the resin sheets to integrally form the multidirectional reinforcing resin sheet, and molding the multidirectional reinforcing resin sheet Is effectively solved, and the weight of the toecap is reduced,
The strength conditions are sufficiently satisfied, and mass production is possible. Furthermore, a plurality of thermoplastic resin sheets made of different materials having different hardness and containing long fibers aligned in one direction with the multi-directional reinforcing resin sheet integrally forming a hard layer and a soft layer, It has the effect of avoiding impact and adding cushioning properties.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a toecap for safety shoes.

FIG. 2 is a partially enlarged view of FIG.

[Explanation of Codes] 1 Toecap 3 Long fiber 5 Multidirectional reinforced resin sheet

Claims (2)

[Claims] 1. A multi-directional reinforced resin sheet integrally formed by superposing a plurality of thermoplastic resin sheets containing long fibers aligned in one direction in multiple directions, and heat-pressing the multi-directional reinforced resin sheet. Toecaps for safety shoes characterized by 2. The toecap of the safety shoe according to claim 1, wherein the multidirectional reinforced resin sheet is a plurality of thermoplastic resin sheets made of different materials having different hardness and containing long fibers aligned in one direction. A toecap for a safety shoe, characterized in that it is laminated in multiple directions to form an integral hard layer and soft layer.