JP2002177010A - Non-slip sole made of synthetic resin foam and its preparation process - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sole which is made of a foam of a synthetic resin such as an ethylene/vinyl acetate copolymer and the like, has an excellent grip on a wet floor (wet grip) and does not easily slip on a wet floor. SOLUTION: The sole is made of a foam of a synthetic resin such as an ethylene/vinyl acetate copolymer. The surface (3) touching the ground has a pattern. The sole is made of a synthetic resin foam having a density of 0.20-0.45 g/cm3. Grooves (4) are formed on the whole area of the sole except for the circumference. Many rows of the grooves (4), which are wavy, are formed widthwisely of the sole. Their depth is larger than the depth of the pattern.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a shoe sole made of a foam made of a synthetic resin such as an ethylene-vinyl acetate copolymer, and more particularly to a shoe sole having excellent grip properties (wet grip properties) on a wet floor. The present invention relates to shoe soles that are not slippery even on the floor.

[0002]

2. Description of the Related Art One of the important characteristics of shoes is slip resistance and light weight. On ordinary dry ground, the uneven design provided on the tread surface of the shoe sole makes it hard to slip, and there is almost no trouble in slipping except for intense exercise. However, since the characteristics are different when the ground is wet, such as during rainfall, slippage often occurs in ordinary shoes. In particular, in order to reduce the weight, the shoe sole made of a synthetic resin foam such as ethylene-vinyl acetate copolymer has a skin layer made of a general rubber compounded vulcanized sole, which is used for many shoes in recent years. Because it is harder than the skin layer, it tends to slip when the ground is wet.

[0003] When the shoe sole made of the synthetic resin foam is used, when the floor is dry, even if it can be walked normally, the floor may only slide a little and get slipped, resulting in injury. It can even happen. There is a limit in preventing such slippage on a wet floor surface simply by providing grooves or uneven designs on the soles of the shoe.

[0004] As described above, the reason why the grip in a wet state is significantly different from the grip in a dry state is due to a water film formed between the shoe sole and the floor. This water film reduces the frictional force generated by the contact between the sole and the floor. In particular, since a uniform water film is generated on a smooth surface, a change in the grip of the shoe sole with respect to the floor surface is large.

It is considered that this water film should be removed in order to suppress the slip on the wet floor. As a method therefor, a so-called deck shoe exclusively used on a deck of a ship or the like is known. In this deck shoe, a large number of rows of waveform cuts are juxtaposed on substantially the entire bottom surface of a smooth shoe bottom without a design. In this shoe sole, the block cut during walking is inclined, the inclined block becomes an edge and stands on the floor, and the edge of each block cuts the water film, so that the floor and the sole are directly By contact, sufficient frictional resistance can be obtained. However, this sole has the disadvantage of being heavy due to the unfoamed body. Furthermore, on dry ground, there is a drawback that the ground contact surface of the shoe sole is slippery because of a smooth shoe sole without any uneven design and no design.

[0006] In order to simultaneously satisfy the anti-slip property and the lightweight property,
A shoe sole has been proposed in which a number of cuts are provided in a lateral direction in a contact surface of a foam sole. However, since the foam has poor physical properties as compared with the unfoamed body, a crack is generated from the tip of the cut, the shoe sole is partially torn, and the durability of the shoe sole is poor. To solve these drawbacks, the shoes become heavier but the density of the foam is 0.7 g / cm @ 3.
Improvements have been proposed, such as setting to a relatively high value of about 0.9 g / cm 3 or embedding a thin, flex-resistant reinforcing body above the cut.

However, since the flex-resistant reinforcing body is an unfoamed body, it has a disadvantage that it is harder to bend at a stepped portion than a foamed body due to a bending action at the time of wearing. Furthermore, since the cut portion of the peripheral portion of the foam sole is applied from the side direction of the sole in addition to the force from the toe and the heel of the sole, the force is applied from three directions and the part is torn. It has a drawback that it is easily damaged and has poor durability as a shoe sole.

[0008]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and has excellent wet grip on a floor wet with water, a floor wet with water and a dry ground. The purpose is to provide a shoe sole that is hard to slip, light, and comfortable to wear.

[0009]

According to the present invention, there is provided a non-slip sole made of a foam, wherein the sole has a skin layer (1) on a ground contact surface (3) and a foam layer thereon. Layer (2)
Is an integrally formed shoe sole made of a synthetic resin such as ethylene-vinyl acetate copolymer having a density of 0.20 to 0.45 g / cm @ 3, and the ground surface (3) of the shoe sole has an uneven surface. In addition, a large number of rows of wavy cuts (4) are provided in the width direction at locations other than the periphery of the ground plane (3).

[0010] The anti-slip sole of the present invention is a sole made of foam, wherein the sole has a skin layer (1) on a ground contact surface (3), and a foam layer (2) is integrally formed thereon. A shoe sole made of a synthetic resin such as an ethylene-vinyl acetate copolymer having a density of 0.20 to 0.45 g / cm 3, wherein the ground surface (3) of the shoe sole has an uneven surface; In addition, a large number of rows of wavy cuts (4) are provided only in the stepped portions of the ground plane (3) at locations other than the peripheral edge of the ground plane (3).

The method for producing a non-slip shoe sole according to the present invention is a method for producing a sole made of foam and having a cut (4) in the ground contact surface, comprising a skin layer (1) and a foam layer (2). The density of the grounding surface having an uneven surface is 0.20 to 0.2.
Forming an outsole sheet made of a synthetic resin such as ethylene-vinyl acetate copolymer of 45 g / cm @ 3; cutting the outsole sheet into a shoe sole shape; A step of cutting outsole in which a large number of rows of wavy cuts (4) are made at locations other than the peripheral edge.

A method for manufacturing a non-slip shoe sole according to the present invention is a method for manufacturing a shoe sole made of foam and having a cut (4) in the ground contact surface, comprising a skin layer (1) and a foam layer (2). The density of the grounding surface having an uneven surface is 0.20 to 0.2.
Forming an outsole sheet made of a synthetic resin such as ethylene-vinyl acetate copolymer of 45 g / cm @ 3; cutting the outsole sheet into a shoe sole shape; A step of cutting an outsole in which a large number of rows of wavy cuts (4) are cut at locations other than the peripheral portion;
A midsole cutting step of cutting a sheet for a midsole made of a synthetic resin such as an ethylene-vinyl acetate copolymer of 20 to 0.45 g / cm3 into a shoe sole shape, and laminating and bonding the midsole on the outsole And a bonding step.

[0013]

Since the cut (4) of the ground contact surface (3) of the shoe sole is provided at a position other than the periphery of the shoe sole, a crack is generated from the cut (4), and the cut (4) is formed in the shoe (4). Since the sole is not applied in the lateral direction of the sole with only the force from two directions from the toe direction and the heel direction of the sole, the sole is not partially torn and the durability as the sole is excellent. The notch (4) is provided at a portion other than the peripheral portion of the shoe sole, and the wider the portion of the peripheral portion of the shoe sole where there is no cut is more excellent in durability as the shoe sole, but the flexibility of the tread portion is higher. In addition, since the width of the wavy cuts (4) in a row in the width direction of the shoe sole becomes narrow, sufficient frictional resistance cannot be obtained, and the slip resistance of the floor wet with water deteriorates. . Therefore, the width of the portion of the shoe sole where there is no cut in the peripheral portion is preferably 10 to 25 mm. If the width of the multiple rows of wavy cuts (4) is kept constant in order to suppress the blade mold production cost, the blade mold production price is reduced. Then,
The width of a portion of the shoe sole where there is no cut in the peripheral portion is different in each portion, but is set in a range of 10 to 25 mm.

In consideration of the durability of the shoe sole, the anti-slip function of the floor wet with water, and the reduction in the price of the blade mold, the cut (4) is formed in the vicinity of the stepped portion of the contact surface (3). And the notch (4) may be provided at a location other than the periphery of the shoe sole.

[0015] The contact surface (3) of the shoe sole has an uneven design,
Parallel cuts are continuous in a multi-row wavy form. When the block cut during walking is inclined, the inclined block becomes an edge and stands on the floor, the edge of each block cuts the water film, and the floor and the shoe sole come into direct contact with each other, A sufficient frictional resistance can be obtained. In order to increase the frictional resistance, it is generally necessary to form a large number of rows of wavy cuts (4) on the bottom surface of a smooth shoe without a design, but the density is 0.20 to 0.20.
Because of the low-density foam of 0.45 g / cm 3, the uneven design of the ground contact surface (3) is crushed by the weight load of the wearer, and the contact surface can be contacted with a larger contact area. If the foam has a density of 0.45 g / cm3 or more, it is not possible to obtain a sufficient frictional resistance on a wet floor without crushing the uneven design of the contact surface (3). 0.45g density
/ Cm3 or more foams are generally hard and difficult to bend at the tread. When the foam has a density of 0.20 g / cm3 or less, the uneven design of the ground contact surface (3) is excessively crushed, and it is easy to slide on dry ground. Furthermore, density 0.20g / cm3
The following foams are generally too soft and do not function as treads for soles. The notch (4) cuts a water film on the floor surface wet with water and contributes to imparting slip resistance. The depth of the concavo-convex design is suitably from 1.0 to 3.0 mm. In the present invention, it is preferable that the interval between the cuts (4) continuous in a wavy shape is in the range of 3 to 6 mm and the depth thereof is in the range of 3.5 to 6.0 mm on the contact surface side of the shoe sole. is there.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 and 2, ethylene-acetic acid having a density of 0.35 g / cm @ 3, in which a skin layer (1) is formed on the grounding surface side and a foam layer (2) is integrally formed thereon. An outsole sheet forming step of forming an outsole sheet having a 1 to 3 mm uneven design on the ground surface (3) of the sole, the sole having a vinyl copolymer as a main component. is there. The thickness of the stepped portion of the molded product is 16 mm.
And the thickness of the heel is processed to 26 mm. The blade type that cuts into a shoe sole shape has a shoe sole shape with an outer peripheral edge of a height of 27 mm, a corrugated band-shaped 5 mm-high notching blade is provided vertically in the blade die, and several tens of rows are provided inside the blade shape. The bottom edge is 10-1
This is a place with a width of 5 mm and no cut.

The workpiece is cut into a shoe sole shape from the direction of the ground contact surface (3) with the blade die, and at the same time, the peripheral portion 10 of the shoe sole is cut.
This is an outsole cutting step in which a large number of rows of wavy cuts are made on the ground contact surface side except for a distance of １５15 mm. A large number of rows of wavy cuts (4) are provided deeper than the design depth in the horizontal direction. The depth of the notch (4) groove is 5.0 to 6.0 m
m.

Further, as another manufacturing method of the present invention, as shown in FIGS. 3 and 4, a skin layer (1) is formed on the ground surface side, and a foam layer (2) is integrally formed thereon. 4
0 g / cm @ 3 of ethylene-vinyl acetate copolymer as a main component.
This is an outsole sheet forming step of forming an outsole sheet provided with m uneven designs.

The molded product is processed into a plate-shaped shoe sole having a thickness of 6 mm. The blade type that cuts into a shoe sole shape has a shoe bottom shape with a height of 6 mm and a constant width of 55 m in width.
6mm high cutting edge with a wavy m
It is provided in the row stepping part, and the peripheral edge of the shoe sole is 1
It is assumed that there is no cut with a width of 0 to 25 mm.

An outsole which cuts the workpiece into a shoe sole shape with the blade shape and makes nine rows of wavy cuts at a portion except for a peripheral portion of the shoe sole of 10 to 25 mm and a tread side of the tread portion. This is a cutting process. A sheet for a midsole mainly composed of an ethylene-vinyl acetate copolymer having a density of 0.20 g / cm3 and composed of only the foam layer (2) is molded. The molded product is processed to a thickness of 10 mm at a step portion and a thickness of 20 mm at a heel portion. The workpiece is 21 mm high
This is a midsole cutting step of cutting into a shoe sole shape with a blade type. A bonding step of laminating and bonding the midsole member on the outsole member.

Regarding the density of the foam containing ethylene-vinyl acetate copolymer as a main component, the higher the density of the outsole member, the more the sole of the outsole is not torn, and the durability of the sole as a sole is high. The lower the density of the midsole member, the better the comfort. Therefore, the density 0.20
It is optimal that the density of the outsole member is high and the density of the midsole member is low within the range of 〜0.45 g / cm 3, but there is no problem even if the density of the outsole member and the density of the midsole member are the same.

In the case where it is provided only in the vicinity of the stepping portion of the contact surface (3) as shown in FIG. 3, the shoe sole is 23.5 cm in height from the position 35 mm vertically from the toe edge of the contact surface (3).
Nine rows of cuts (4) with a constant width of 55 mm are provided in the heel direction at intervals of 4 mm. Nine rows of cuts (4) are provided between the vertical widths of 40 mm. Since the cut (4) having a width of 55 mm is a constant width, the width of a portion of the shoe sole where there is no cut in the peripheral portion is different in each portion, but is in the range of 10 to 25 mm.

As the foam of the synthetic resin, a foam of an ethylene-vinyl acetate copolymer is generally used. Polyurethane resins, polyethylene resins, polybutadiene resins, polyolefin resins and rubbers, and mixtures thereof are used. It is sufficient that the foam of the foam is fine as long as the bubbles of the foam are fine.

Further, the present invention is applicable not only to casual ordinary soles but also to shoes used by people engaged in cooking when the sole material is made of oil-resistant synthetic resin such as ethylene-vinyl acetate copolymer. With respect to the above, even when the smooth cement and grid-like iron plate floor surface are wet with oil and water and slippery, they can be used as slip-resistant shoe soles that are hard to slip and work without fatigue.

[0025]

[Effect] The contact surface (3) of the shoe sole has an uneven design, and it is hard to slide on dry ground due to the uneven design provided on the shoe sole. In addition, since the sole of the shoe is a low-density foam having a density of 0.20 to 0.45 g / cm3, and a large number of rows of wavy cuts (4) are provided deeper than the uneven design depth, Since the uneven design of the contact surface (3) of the shoe sole is crushed by the load of the weight of the person and can contact the contact surface with a larger contact area, the cut (4) is formed on the floor surface wet with water. It cuts off the water film, making it hard to slip on a smooth floor wet with water.
It is a lightweight shoe sole that does not slip easily on both dry and wet floors.

The sole has a density of 0.20 to 0.45 g / cm 3
Even if there are many rows of wavy cuts (4) in the low-density foam of (1), cracks are generated from the cuts (4) because the periphery of the shoe sole has a constant width and no cuts The sole is not partially torn, and the low-density foam is excellent in durability as the sole. It is a light shoe sole that is easy to bend at the stepping portion due to the bending action when worn.

[Brief description of the drawings]

FIG. 1 is a bottom view of a shoe sole according to the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a bottom view of a shoe sole according to another embodiment of the present invention.

FIG. 4 is a sectional view taken along the line BB in FIG. 3;

[Explanation of symbols]

 1. 1. Skin layer Foam layer 3. Ground plane 4. Cut

Claims (4)

[Claims] 1. A sole made of foam, wherein the sole has a skin layer (1) on a ground contact surface (3), and a foam layer (2) is integrally formed on the sole layer. ~ 0.45g
/ Cm3 of a shoe sole made of a synthetic resin such as an ethylene-vinyl acetate copolymer or the like, wherein the contact surface (3) of the shoe sole is provided with an uneven surface, and a peripheral portion of the contact surface (3) is excluded. A non-slip shoe sole characterized in that a number of rows of wavy cuts (4) are provided at locations. 2. The non-slip sole according to claim 1, wherein the cuts (4) are provided only at a step portion of the ground contact surface (3). 3. A method for producing a shoe sole comprising a foam and having a notch (4) in the ground contact surface, wherein the density comprises a skin layer (1) and a foam layer (2) and has an uneven surface on the contact surface. Forming an outsole sheet made of a synthetic resin such as ethylene-vinyl acetate copolymer of 0.20 to 0.45 g / cm 3, cutting the outsole sheet into a shoe sole shape, Ground plane (3)
Many rows of wavy cuts (4) except for the peripheral edge of
And a step of cutting an outsole into which a shoe is inserted. 4. A method for manufacturing a shoe sole comprising a foam and having a cut (4) in a ground contact surface, comprising: a skin layer (1) and a foam layer (2); Forming an outsole sheet made of a synthetic resin such as ethylene-vinyl acetate copolymer of 0.20 to 0.45 g / cm 3, cutting the outsole sheet into a shoe sole shape, Ground plane (3)
Many rows of wavy cuts (4) except for the peripheral edge of
Of cutting outsole for filling and foam layer (2)
A midsole cutting step of cutting a midsole sheet made of a synthetic resin such as an ethylene-vinyl acetate copolymer having a density of 0.20 to 0.45 g / cm 3 and formed solely into a sole shape; A method of manufacturing a shoe sole, comprising: a laminating step of laminating and adhering the midsole.