JP2002119302A - Shoe sole, its manufacture and shoe using the sole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a shoe sole with improved durability, wearing resistance and wearing feeling by preventing bad adhesion and formation and to provide a shoe using the sole. SOLUTION: This is a shoe sole 10 comprising two layers of a mid-sole 20 adhered to the sole face of a shoe 1 and an out-sole 30 adhered to the bottom face of the mid-sole 20. The out-sole 20 has a toe part 31, tread part 32, arch part 33, and heel part 34. A jaw part 35 forming a step between the tread part 33 and the arch part 34 is formed in a taper shape becoming larger toward the grounding face.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sole provided on the bottom surface of shoes such as safety shoes, a method of manufacturing the sole, and shoes using the sole.

[0002]

2. Description of the Related Art Conventionally, shoes such as safety shoes are worn for various tasks. There is a demand for a shoe sole of such a shoe which has excellent durability and abrasion resistance and is light in weight.

[0003] Thus, excellent durability and abrasion resistance,
As a lightweight shoe sole, a shoe sole made of foamed polyurethane has been proposed. However, a shoe sole made of foamed polyurethane has a problem that it is hydrolyzable and has poor scratch resistance.

[0004] In order to solve such a problem, there has been proposed a foamed polyurethane two-layer shoe sole by direct molding of injection molding.

In this foamed polyurethane two-layer shoe sole, the outsole on the ground side is provided with a high-density foam which is more excellent in abrasion resistance, hydrolysis resistance and physical properties than a midsole (low density foamed polyurethane) as an intermediate layer. Polyurethane, rubber, and thermoplastic polyurethane are used.

Here, a foamed polyurethane two-layer shoe sole using high-density foamed polyurethane for the outsole shown in FIG. 7 will be described. FIG. 7 is a sectional view of the shoe.

As shown in the figure, a sole 110 provided on the bottom surface of a shoe 101 has a midsole 120 made of low-density foamed polyurethane having excellent cushioning properties. Outsole 1 made of high-density polyurethane foam with excellent wear resistance
The molding of the midsole 120 and the bonding to the upper 102 are simultaneously performed.

The outsole 130 has a toe 131, a stepping part 132, a stepping part 133, and a heel part 134 from the tip corresponding to each part of the foot.

Also, the stepping portion 13 of the outsole 130
The jaw portion 1 forming a step is provided at the boundary between the heel portion 3 and the heel portion 134.
35 are formed.

In such a two-layer sole, although the scratch resistance can be improved by eliminating hydrolysis, since the outsole 130 is formed of high-density foamed polyurethane, the weight of the shoe increases. I will. For this reason, the thickness of the outsole 130 is made as thin as possible within a range where the durability of the outsole 130 is maintained, and the thickness is made substantially uniform except for the uneven pattern of the sole contact surface. for that reason,
The thickness t of the jaw portion 135 of the outsole 130 is also substantially uniform, and the angle between the inner surface 137 of the jaw portion 135 and the contact surface is approximately the same as the angle between the outer surface 136 of the jaw portion 135 and the contact surface. Is formed.

[0011]

However, in such a sole, when the midsole raw material is injected and injected, the raw material comes into contact with the inner surface of the jaw portion, fills the heel portion, and then steps on the heel portion. The part and the toe part and the tip are sequentially filled. At this time, the raw material of the midsole in contact with the inner surface of the jaw easily embraces the air bubbles, and the air bubbles flow toward the front end, so that a much larger air pocket than a cell formed by foaming, and a so-called void out. It is formed on the adhesive surface between the sole and the midsole. If these voids are formed near the outer edge, poor adhesion occurs, and if they are formed in the center or the like, there is a problem that the wearing comfort deteriorates.

Further, the raw material injected at the time of molding the shoe sole flows toward the tip side after filling the heel portion, so that a slight misalignment of injection conditions causes poor filling, and chipping of the toe portion occurs. There is a problem that occurs.

Further, depending on the working environment in which such a shoe sole is used, there are cases where the chin is used to kick or the chin is used to support the shoe. In the working environment used in this way, there is a problem that the jaw part is partially worn.

Further, since the entire heel portion of such a sole is thicker than other portions, there is no problem with the cushioning properties of the midsole that makes up most of the volume, but the outsole that supports it is weak, so it is stable. There is a problem that the feeling is impaired.

The present invention has been made in view of the above circumstances, and a shoe sole having improved durability, abrasion resistance and comfortableness by preventing poor formation such as poor adhesion and poor molding, a method of manufacturing the same, and shoes using the same. The task is to provide

[0016]

A first aspect of the present invention to solve the above-mentioned problem is that a midsole joined to a bottom surface of a shoe and an outsole joined to a bottom surface of the midsole include two layers. Wherein the outsole has a toe portion, a stomping portion, a step portion, and a heel portion corresponding to each portion of a foot, and forms a step between the step portion and the heel portion. The shoe sole has a tapered shape in which a thickness of a jaw portion gradually increases toward a ground contact surface.

In the first aspect, the jaw portion is formed to have a tapered shape, so that the jaw portion supports the heel portion to increase a sense of stability when worn, thereby preventing deformation of the shoe sole and partial wear. it can.

According to a second aspect of the present invention, in the first aspect, the angle between the inner surface of the jaw portion and the ground contact surface is 30.
The shoe sole is characterized in that the shoe sole is formed in a range from 60 ° to 60 °.

In the second aspect, by forming the inner surface of the jaw at a predetermined angle, the sense of stability when worn is increased,
Deformation and partial wear of the sole can be prevented.

According to a third aspect of the present invention, in the first or second aspect, the midsole is formed of low-density foamed polyurethane, and the outsole is formed of high-density foamed polyurethane as compared with the midsole. Characterized by being in the sole of the shoe.

According to the third aspect, the cushioning property, high strength and abrasion resistance of the shoe sole can be improved.

A fourth aspect of the present invention is the shoe sole according to the first or second aspect, wherein the midsole is formed of low-density foamed polyurethane, and the outsole is formed of rubber. is there.

According to the fourth aspect, the cushioning property, high strength and abrasion resistance of the shoe sole can be improved.

A fifth aspect of the present invention is the shoe according to the first or second aspect, wherein the midsole is formed of low-density foamed polyurethane, and the outsole is formed of thermoplastic polyurethane. At the bottom.

According to the fifth aspect, the cushioning property, high strength and abrasion resistance of the shoe sole can be improved.

According to a sixth aspect of the present invention, there is provided a shoe comprising the shoe sole according to any one of the first to fifth aspects.

According to the sixth aspect, it is possible to realize a shoe which is excellent in cushioning property, high strength and abrasion resistance, and has an increased sense of stability when worn.

According to a seventh aspect of the present invention, there is provided a method for manufacturing a shoe sole, comprising forming two layers, a midsole joined to a bottom surface of a shoe and an outsole joined to the bottom surface of the midsole, by molding. Injecting outsole raw material into a mold having a predetermined shape to form the outsole, and forming a jaw portion forming a step between the stepping portion and the heel portion so that the thickness gradually increases toward the ground contact surface. And injecting a midsole raw material with a mold having a predetermined shape onto the outsole to form the midsole and joining the midsole to the outsole and the upper of the shoe. In the manufacturing method.

According to the seventh aspect, when filling the midsole raw material, entrapped air bubbles due to contact with the jaws of the outsole, poor adhesion due to the air bubbles, deterioration of comfort and poor filling, etc. Poor molding can be prevented.

According to an eighth aspect of the present invention, in the seventh aspect, the step of molding the outsole is previously performed in a separate step by injection or press, and the outsole is subjected to a predetermined treatment as necessary. Then, the method for manufacturing a shoe sole is characterized in that it is placed in a mold to form a midsole.

In the eighth aspect, after the outsole is formed in another step, the midsole can be easily formed by injection molding.

According to a ninth aspect of the present invention, in the seventh or eighth aspect, in the step of forming the jaw portion by molding the outsole, the angle between the inner surface of the jaw portion and the grounding surface is 30 degrees. A method for manufacturing a shoe sole, characterized in that the shoe sole is formed in the range of from 60 ° to 60 °.

In the ninth aspect, by forming the inner surface of the jaw portion at a predetermined angle, it is possible to reliably prevent air bubbles from being trapped when filling the midsole raw material.

According to a tenth aspect of the present invention, in any one of the seventh to ninth aspects, the midsole raw material is a low-density foamed polyurethane, and the outsole raw material has a higher density than the midsole raw material. A method for producing a shoe sole, characterized by being foamed polyurethane.

In the tenth aspect, the cushioning property
A shoe excellent in high strength and abrasion resistance can be easily and reliably formed.

An eleventh aspect of the present invention is the shoe sole according to any one of the seventh to ninth aspects, wherein the midsole raw material is a low-density foamed polyurethane, and the outsole raw material is rubber. It is in.

In the eleventh aspect, the cushioning property
A shoe excellent in high strength and abrasion resistance can be easily and reliably formed.

In a twelfth aspect of the present invention, in any one of the seventh to ninth aspects, the midsole raw material is a low-density foamed polyurethane and the outsole raw material is a thermoplastic polyurethane. On the soles.

In the twelfth aspect, the cushioning property
A shoe excellent in high strength and abrasion resistance can be easily and reliably formed.

[0040]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on embodiments.

FIG. 1A is a sectional view of a shoe according to one embodiment, and FIG. 1B is a bottom view of the shoe according to one embodiment.

As shown, the shoe sole 10 of the present embodiment is shown.
Is formed of two layers: a midsole 20 joined to the bottom surface of the shoe 1 and an outsole 30 joined to the bottom surface of the midsole 20 and having an uneven pattern 30a on the bottom surface.

Midsole 20 and outsole 30
Are formed from toes 21 and 31, stepping parts 22 and 32, steps 23 and 33, and heels 24 and 34 in order from the tip corresponding to each part of the foot.

Each of the midsole 20 and the outsole 30 has a tread portion 23 and 33 and a heel portion 24.
And jaw portions 25 and 35 which form a step between them are provided.

The jaw portion 35 of the outsole 30 is provided such that its thickness gradually increases toward the ground contact surface of the outsole 20. In the present embodiment, the jaw portion 35 is provided, for example, at an angle of 60 ° to 90 ° between the outer surface 36 of the jaw portion 35 and the grounding surface, and at an angle of 60 ° in the present embodiment, and has an inner surface 37 (midsole). The angle between the outer surface 26) of the jaw part 25 of 20 and the contact surface is set at an angle of 30 ° to 60 °, preferably 45 °.

The midsole 2 constituting the sole 10
In the present embodiment, the midsole 20 and the outsole 30 are formed of low-density foamed polyurethane having excellent cushioning properties, and the outsole 30 is formed of the midsole 2.
It is formed of a high-density foamed polyurethane having higher strength and higher abrasion resistance than that of No. 0. Sole 1 made of such material
By forming each layer of No. 0, the shoe sole 10 excellent in cushioning property, high strength and abrasion resistance can be formed.

In this embodiment, the outsole 30
Polyurethane foam of high density was used as a material of the midsole 20 as compared with the midsole 20, but is not limited to this. For example,
Rubber or thermoplastic polyurethane may be used, and even when rubber or thermoplastic polyurethane is used for the outsole 30, the sole 10 has excellent cushioning, high strength, abrasion resistance and other disadvantages of high-density foamed polyurethane. Can be formed.

The shoe 1 provided with the shoe sole 10 of the present embodiment has an upper 2 having a bottom surface to which an upper surface of a midsole 20 is joined to cover the entire foot, and a tip portion of the upper 2, that is, a toe of the foot. And a toe core 3 that fits in a region corresponding to the toe to protect the toe. Further, a shank 5 made of steel or the like, which supports the arch portion of the foot and facilitates walking, is joined to the bottom surface of the upper 2.

The sole 10 provided on such a shoe 1 has
Since the thickness of the jaw portion 35 is provided so as to increase gradually with respect to the ground contact surface, the jaw portion 35 serves as a support for the heel portion 34 and can increase the sense of stability when wearing shoes. The jaw portion 35
Since the thickness of the shank 5 is increased, the work of the shank 5 is assisted, the deformation of the shoe sole is prevented, and the sense of stability can be increased.

Further, when the shoe 1 is worn, the chin 3
Even if it is an operation that uses the outer surface 36 of the jaw 5 extremely,
Is provided thick, so that partial wear can be prevented.

Here, the manufacturing process for forming the shoe sole on the shoe sole will be described below.

FIGS. 2 and 3 are sectional views showing a method for manufacturing a shoe sole according to one embodiment.

As shown in FIGS. 2A and 3A,
A shoe sole injection mold (hereinafter, simply referred to as a mold) includes a bottom mold 41 that forms an uneven pattern 30 a on the bottom surface of the outsole 30, and a side mold 42 that forms side surfaces of the outsole 20 and the midsole 30. , A dummy mold 43 forming the upper surface of the outsole 30, and a last mold 44 forming the upper surface of the midsole 20.

The bottom mold 41 is used for the outsole 30
Pattern is formed on the bottom surface of the outsole 30 at the time of molding.
A plurality of convex portions 45 forming a are formed.

The side mold 42 has side walls 46 defining side surfaces of the midsole 20 and the outsole 30.
The bottom mold 41 is fitted in one opening of the side wall 46, and the dummy mold 43 or the last mold 44 is fitted in the other opening to secure a sealed space.

The side mold 42 has a side wall 46.
Are provided with an outgoing outlet 47 and a mid outlet 48 for injecting the outsole raw material and the midsole raw material, respectively.

Further, the dummy mold 43 is fitted to the side wall 46 of the side mold 42 and
The outsole assembly 40A including the side mold 42 and the dummy mold 43 defines an outsole injection space 50 for forming the outsole 30.

The last mold 44 is fitted on the side wall 46 of the side mold 42, and is formed on the bottom mold 41 by the midsole assembly 40B including the bottom mold 41, the side mold 42 and the last mold 44. The sole 30, the side mold 42 and the last mold 44 define a midsole injection space 51 for forming the midsole 20.

Here, each step of forming a shoe sole using such a mold will be described.

First, as shown in FIG. 2A, the bottom mold 41, the side mold 42 and the dummy mold 4
The outsole injection space 50 sealed by the outsole assembly 40A obtained by assembling 3 is formed.

A predetermined amount of an outsole raw material, in this embodiment, a high-density foamed polyurethane raw material, is injected into the outsole injection space 50 from the out injection opening 47 of the side mold 42 of the outsole assembly 40A.

Next, as shown in FIG. 2B, the bottom mold 41 is moved to the dummy mold 43 side, so that the outsole material is pressed against the dummy mold 43 by the bottom mold 41 at a predetermined pressure. Form 30.

At this time, the step portion 4 of the dummy mold 43
3a, in the present embodiment, the angle between the surface of the step portion 43a and the ground surface is formed at 45 °, and the step portion 41a of the bottom mold 41 has an angle of 60 ° between the surface and the ground surface. , The dummy mold 43
Surface of the step 43a and the step 4 of the bottom mold 41
The jaw portion 35 which is a step between the step portion 33 and the heel portion 34 due to the surface of 1a has an angle between the outer surface 36 and the contact surface of 60 °, and an angle between the inner surface 37 and the contact surface of 45 °. The jaw portion 35 is formed, and its thickness gradually increases toward the ground contact surface.

Next, as shown in FIG. 3A, the outsole 30 is molded.
3 and the last mold 44 covered with the upper 2 to which the leading core 3 and the shank 5 are joined is inverted, and the last mold 44 with the upper 2 is replaced with the side mold 4.
2 to form a midsole assembly 40B, and an outsole 30, a side mold 42 and a last mold 4 with an upper 2 formed on a bottom mold 41.
4 forms a sealed midsole injection space 51. Then, a predetermined amount of a midsole raw material, in this embodiment, a foamed polyurethane raw material having a lower density than the outsole raw material, is injected from the mid injection port 48 of the side mold 42 into the midsole injection space 51.

At this time, the jaw portion 35 of the outsole 30
The inner surface 37 is formed with a smooth slope of 45 ° with respect to the ground contact surface, so that the midsole raw material is
Of the outsole 30 from the heel portion 34 to the stepping portion 33 and the stomping portion 3 without contacting the inner surface 37
2. A space 40B for the midsole sequentially on the toe 31
Injected into. In addition, since the midsole raw material is sequentially injected into the midsole space 40B, it is possible to prevent shortage of the toes 21 and the like due to insufficient filling due to slight deviation of injection conditions.

Next, as shown in FIG. 3B, the bottom mold 41 is moved to the last mold 44 side, and the space between the outsole 30 formed on the bottom mold 41 and the last mold 44 covered with the upper 2 is formed. Foam molding.

Thereafter, when a predetermined time has elapsed, the midsole 20 is solidified, so that the midsole 20 is solidified.
Is bonded to the outsole 30 and the upper 2, and the shoe sole 10 is manufactured.

In the above-described example, the outsole 30 and the midsole 20 are sequentially injection-molded to form the shoe sole 10 in a series of manufacturing steps. However, the present invention is not limited to this. 30 may be molded in advance by injection or press in a separate step, and the midsole 20 may be integrally provided by injection molding. In the case where the outsole 30 is formed in advance as described above, when the outsole is formed by the usual method of forming the sole, the outsole 30 is used for injection molding on the inner surface side of the sole of the molding die used for molding. Dummy mold 4
The jaw portion 35 of the outsole 30 may be formed by providing a step 43a similar to that of the step 3. After the outsole 30 is formed in this way, the surface treatment and the adhesion treatment are appropriately performed as necessary, and then the substrate is placed on the bottom mold 41, and the midsole 20 is formed by the above-described injection molding.

As described above, in this embodiment, the inner surface 37 of the jaw portion 35 of the outsole 30 is set at 30 ° with respect to the ground surface.
The angle of the jaw portion 35 is formed so as to gradually increase with respect to the ground contact surface, so that when the midsole raw material is injected at the time of molding the midsole 20, The midsole 20 can be formed without causing bubbles to be trapped by the raw material abutting against the inner surface 37 of the jaw portion 35 or chipping of the toe portion 21 or the like due to insufficient filling.
The shoe 1 can be formed in which poor adhesion between the shoe and the outsole 30 and a decrease in comfort are prevented.

In the present embodiment, the jaw portions 25 and 3
Although the shoe sole 5 is provided on a substantially straight line in the width direction of the shoe sole 10, the shapes of the jaws 25 and 35 are not limited thereto.

FIGS. 4 to 6 show other examples of the shape of the jaw portion. 4 to 6 are a bottom view and a side view showing another example of the shape of the jaw portion.

As shown in FIG. 4, the shoe sole 10A is provided with a jaw portion 35A of the outsole 30A curved toward the heel portion 34 side.

As shown in FIG. 5, the sole 10B is
A protruding portion 33a is provided, which protrudes so that a portion near the center in the width direction of the step portion 33 of the outsole 30B gradually increases toward the heel portion 34 side.

Further, as shown in FIG.
In the outsole 30C, a cutout portion 34a is provided on the heel portion 34 toward the rear end side.

As described above, even in the shoe sole shown in FIGS. 4 to 6, the angle between the inner surfaces 37A to 37C of the jaw portions 35A to 35C and the ground contact surface is 30 ° to 60 °, preferably 45 °.
And the thickness of the jaw portions 35A to 35C gradually increases toward the ground contact surface, the same effect as in the above-described embodiment can be obtained.

[0076]

As described above, according to the present invention, since the thickness of the jaw portion forming the step between the step portion of the outsole and the heel portion is provided so as to gradually increase toward the ground contact surface, the jaw portion is provided. Can support the heel portion, increase the sense of stability when worn, and prevent deformation and partial wear of the shoe sole.

In molding the sole, when the midsole is injection-molded, bubbles are prevented from being generated due to the midsole raw material coming into contact with the inner surface of the jaw portion of the outsole. For this reason, it is possible to prevent poor formation such as poor adhesion or poor molding.

[Brief description of the drawings]

FIG. 1 is a sectional view and a bottom view of a shoe according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a step of manufacturing a shoe sole according to one embodiment of the present invention.

FIG. 3 is a cross-sectional view illustrating a step of manufacturing a shoe sole according to an embodiment of the present invention.

FIG. 4 is a bottom view and a side view showing a modified example of the shoe sole according to one embodiment of the present invention.

FIG. 5 is a bottom view and a side view showing a modified example of the shoe sole according to one embodiment of the present invention.

FIG. 6 is a bottom view and a side view showing a modified example of the shoe sole according to one embodiment of the present invention.

FIG. 7 is a side view and a sectional view of a shoe according to the prior art of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shoes 2 Upper 3 Front core 10 Sole 20 Midsole 25 Midsole jaw part 26 Outer surface of midsole jaw part 30 Outsole 35 Outsole jaw part 36 Outsole jaw part outer surface 37 Outsole jaw part 40 Injection mold 40A Outsole assembly 40B Midsole assembly 41 Bottom mold 42 Side mold 43 Dummy mold 44 Last mold 50 Outsole injection space 51 Midsole injection space

Claims (12)

[Claims] 1. A midsole joined to a bottom surface of a shoe;
2 with the outsole joined to the bottom of the midsole
A shoe sole comprising a layer, wherein the outsole corresponds to each part of a foot,
A shoe having a stomping portion, a step portion, and a heel portion, wherein a thickness of a jaw portion forming a step between the step portion and the heel portion has a tapered shape gradually increasing toward a ground contact surface. bottom. 2. The shoe sole according to claim 1, wherein an angle formed between an inner surface of the jaw portion and the ground contact surface is formed in a range of 30 ° to 60 °. 3. The midsole according to claim 1, wherein the midsole is formed of a low-density foamed polyurethane, and the outsole is formed of a high-density foamed polyurethane compared to the midsole. Shoe sole. 4. The sole according to claim 1, wherein the midsole is formed of low-density foamed polyurethane, and the outsole is formed of rubber. 5. The sole according to claim 1, wherein the midsole is formed of low-density foamed polyurethane, and the outsole is formed of thermoplastic polyurethane. 6. A shoe comprising the shoe sole according to claim 1. 7. A midsole joined to the bottom of the shoe,
2 with the outsole joined to the bottom of the midsole
In a method for manufacturing a shoe sole by forming a layer, an outsole material is injected into a mold having a predetermined shape to form the outsole, and a jaw portion that forms a step between a tread portion and a heel portion is grounded. Forming a midsole material by injecting a midsole raw material by a mold having a predetermined shape onto the outsole, and joining the midsole to the outsole and the upper of the shoe. And a step of producing a shoe sole. 8. The outsole according to claim 7, wherein the step of molding the outsole is performed in a separate step by injection or press in advance, and after the outsole is subjected to a predetermined process as necessary, the outsole is placed in a mold. A method of manufacturing a shoe sole, comprising: forming a midsole by using the method. 9. The method according to claim 7, wherein in the step of forming the jaw portion by molding the outsole, an angle formed between an inner surface of the jaw portion and the grounding surface is from 30 ° to 6 °.
A method for manufacturing a shoe sole, wherein the shoe sole is formed in a range of 0 °. 10. The method according to claim 7, wherein the midsole raw material is a low-density foamed polyurethane,
A method for manufacturing a shoe sole, wherein the outsole material is a polyurethane foam having a higher density than the midsole material. 11. The method according to claim 7, wherein the midsole raw material is a low-density foamed polyurethane,
The method for producing a shoe sole, wherein the raw material of the outsole is rubber. 12. The method according to claim 7, wherein the midsole raw material is a low-density foamed polyurethane,
A method for producing a shoe sole, wherein the outsole raw material is a thermoplastic polyurethane.