JP5305196B2 - Shoe sole material and molding method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shoe sole material which is durable and abrasion resistant, and proves to be slip resistant even on an ice surface and a dry or wet floor surface of a polished stone material, and a method of forming the shoe sole material. <P>SOLUTION: In the shoe sole material 4 in which a rubber material is mixed with short fibers 3, many independent protrusions 41 are provided on the underside of a shoe sole, and the rising angles 13 of the peripheral walls of the bottom surfaces of the protrusions 41 are formed nearly at right angles to the bottom surfaces, and then the short fibers 3 are exposed to the bottoms 411 of the protrusions by orienting the short fibers nearly horizontally with respect to the bottom surfaces in the vicinities of the peripheral portions of the bottom surfaces of the protrusions and orienting the short fibers nearly perpendicularly in the vicinities of the central portions of the bottom surfaces. The rubber material in which the short fibers 3 are oriented nearly perpendicularly in the vicinities of the central portions of the protrusions is made harder than the rubber material in the vicinities of the outside peripheries of the bottom surfaces. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a shoe sole material in which short fibers are blended with a rubber fabric and a molding method thereof, and more particularly to a shoe sole having anti-slip properties and a molding method thereof.

  Conventionally, as an anti-slip shoe sole, a footwear sole having an area in which a rubber portion containing glass fiber having a bottom ground contact surface in an axial direction and a foamed rubber portion are mixed alternately is provided on the ground contact surface. Proposed by the issue.

  In this conventional footwear bottom, the rubber part containing glass fibers arranged in the direction toward the bottom grounding surface has an anti-slip function on the ice surface, and the foamed rubber part having low hardness has a slippery floor surface. Although it exhibits an anti-slip function, since the bottom ground contact surface in contact with the floor surface is partly foamed rubber, it is likely to deteriorate with time and durability and anti-slip properties are not sufficient. Moreover, since the foamed rubber of the shoe sole is directly subjected to impact force and frictional force at the time of landing, the wear of the shoe sole protrusion is severe and the wear resistance is insufficient. Further, the conventional shoe sole has a rubber portion containing glass fibers oriented in the direction of the ground plane, and the glass fiber is mixed with unvulcanized rubber and rolled to overlap the rolled sheets with the glass fibers oriented and rolled in the rolling direction. There is a disadvantage that the cutting operation must be performed in a direction perpendicular to each other and the molding operation is complicated and the cost is increased.

  Further, in order to eliminate these disadvantages, unvulcanized rubber fabric and hard fibers were mixed in a shoe sole material molding die having a large number of independent projection molding recesses provided with inflow holes in Japanese Patent Application Laid-Open No. 2004-49682. Heterogeneous unvulcanized rubber fabrics are placed and stacked one after another, and these unvulcanized rubbers are heated and pressurized to fill the projection molding recesses and to align the hard fibers in the vertical direction while flowing into the inflow holes. Then, after forming the protrusions integrally, the bottom part of the protrusions was buffed to form the bottom surface of the protrusions with a different rubber member to expose the hard fibers.

This conventional method for forming a shoe sole material has the advantage that the hard fibers are oriented in the vertical direction during molding as described above, and can be easily molded. However, since the gripping force of the hard fibers is low, the slip resistance on the ice surface is still not good. It was not satisfactory, and the slip resistance on dry or wet floors was still not sufficient.
Japanese Utility Model Publication No. 62-21904 JP 2004-49682 A

Therefore, the present invention is intended to solve the above-mentioned conventional problems, and its object is excellent in durability and wear resistance, and a dry floor surface such as ice surface or polished stone material or The present invention aims to provide a shoe sole material having an excellent anti-slip property even on a wet floor surface and the shoe sole material at a low cost by a very simple method.

  The present invention relates to a shoe sole material in which short fibers are blended with rubber fabric, the rising angle of the bottom outer peripheral wall of a large number of independent protrusions on the bottom surface of the shoe is substantially perpendicular to the bottom surface, and the short fibers are In the vicinity of the outer periphery of the bottom surface of the projection, it is oriented in a substantially horizontal direction with respect to the bottom surface, and in the vicinity of the center portion of the bottom surface of the protrusion, it is oriented in a substantially vertical direction and exposed to the bottom surface. The gist of the sole material is characterized in that the hardness is higher than that of the sole material near the outer periphery.

As a result, the shoe sole material of the present invention is less likely to damage the floor surface because the short fibers are oriented in a substantially horizontal direction on the soft rubber fabric at the outer peripheral portion of the bottom surface of the projection, and also has flexibility and strength in the horizontal direction. By providing it, the slip resistance can be improved on a normal road surface, and the water surface can be cut off by the edge of the protrusion to be caught and the floor surface can be captured. And in the center part of the bottom face of the protrusion, the slip resistance on the ice surface is functionally exhibited by the short fibers oriented in the substantially vertical direction. Further, the shoe sole material of the present invention has a structure in which the rubber fabric near the center of the bottom surface has a higher hardness than the rubber fabric near the outer periphery of the bottom surface, so that the short fibers oriented in a substantially vertical direction are firmly fixed by the hard rubber member. Therefore, the gripping force is further increased and the grip effect is improved.

The shoe sole material is characterized in that a cloth is provided on the upper surface of the shoe sole.

As a result, the sole material of the present invention is formed by injection molding a separate sole body, casting and joining the injection molding material to the cloth, and joining the sole body and the sole material through the cloth to form an integral part. This makes it possible to easily mold the sole. Cotton, hemp fabric, woolen fabric, synthetic fabric, synthetic fabric, felt or the like is used as the fabric.

In addition, the present invention provides a shoe sole material molding die in which a rising angle of the bottom outer peripheral wall of a large number of independent projection forming recesses is substantially perpendicular and an inflow hole is provided in the center of the bottom surface of the projection forming recess. A first unvulcanized rubber fabric in which short fibers are oriented in a direction substantially parallel to the longitudinal direction and a second unvulcanized rubber fabric in which short fibers are mixed are sequentially placed and laminated, and these unvulcanized products By heating and pressurizing the rubber fabric, the projection molding recess is filled and flows into the inflow hole so that the first unvulcanized rubber short fibers are arranged substantially horizontally with respect to the bottom surface in the vicinity of the outer periphery of the projection molding recess. Orienting the short fibers of the second unvulcanized rubber in a direction substantially perpendicular to the bottom surface in the vicinity of the center of the bottom surface of the protrusion forming recess, and then integrally forming the protrusion, and then buffing the bottom of the protrusion. The protrusion outer peripheral wall was formed at a right angle. A shoe sole material characterized in that the heel is constituted by different rubber members of the first rubber fabric and the second rubber fabric, and the short fibers are exposed in a substantially vertical direction at the center of the bottom surface of the protrusion. The forming method is the gist of the invention.

Thereby, the molding method of the shoe sole material of the present invention is such that the short fibers are oriented horizontally in the soft rubber fabric at the outer periphery of the bottom of the projection, and the short fibers are oriented vertically in the hard rubber fabric at the center of the bottom of the projection. The formed protrusion can be formed very easily.

In the shoe sole material of the present invention, the hardness of the first unvulcanized rubber near the outer peripheral portion of the bottom surface of the projection after molding is 40 to 60 degrees, and the second unvulcanized material near the center portion of the bottom surface of the protrusion. The hardness of the rubber was 65 to 90 degrees.
As a result, the short fibers oriented in a substantially vertical direction at the center of the bottom of the protrusion are firmly fixed with a hard rubber cloth, so that the gripping force is improved, and the short fibers are placed in a soft rubber cloth at the outer periphery of the bottom of the protrusion. Is oriented in a substantially horizontal direction without being exposed vertically to the bottom surface of the protrusion, and therefore, by providing flexibility and strength in the horizontal direction, the slip resistance is increased and the grip property is obtained.

In the shoe sole molding method, after placing the second unvulcanized rubber fabric on the first unvulcanized rubber fabric, placing a cloth thereon, and then heating them. The protrusion is integrally formed by pressing to form a sole material having a cloth on the upper surface of the sole.
As a result, the sole material of the present invention is formed by integrally molding the sole body and the sole material through the cloth by throwing and joining the injection molding material to the cloth simultaneously with the injection molding of the separate sole body. The shoe sole can be easily formed.

  As described above, the shoe sole material of the present invention is composed of protrusions in which short fibers are oriented in a substantially horizontal direction at the outer peripheral part of the protrusion and in a substantially vertical direction at the center part of the bottom of the protrusion. Since the short fibers oriented in the substantially vertical direction are fixed on the rubber member, the gripping force increases, and on the floor surface of polished stone, the resistance of the rubber member with low hardness and the sliding resistance due to the rigidity in the horizontal direction Grip is demonstrated by force. Further, the method for forming the shoe sole material of the present invention has the short fibers oriented and exposed in a substantially vertical direction with respect to the grounding surface near the center of the bottom surface of the protrusion, and the grounding surface near the outer peripheral portion of the bottom surface of the protrusion. A shoe sole material in which short fibers are oriented in a substantially horizontal direction can be easily formed.

  The shoe sole material of the present invention has an effect of preventing slippage on a wet floor surface because the rising angle of the outer peripheral wall of the projection is formed at a right angle so that the water film can be cut and removed at the edge. . Furthermore, the shoe sole material of the present invention has an advantage that it is easy to laminate and adhere to a separate shoe sole body via the cloth by throwing an injection molding material by providing a cloth on the upper surface of the shoe sole.

  In the present invention, the shoe sole material molding die 1 is provided with a large number of independent projection molding recesses 11, the rising angle 13 of the bottom peripheral wall 110 of the projection molding recess is substantially perpendicular, and the inflow hole 12 is provided at the center of the bottom surface. It consists of different shapes. The planar shape of the independent protrusion 41 may be a triangle, a rectangle, a circle, a polygon, an ellipse or the like, and any special shape may be used. Further, the inflow hole 12 may have a planar shape that is substantially similar to the protrusion, or may have a different shape. The inflow hole 12 has an advantage that it is easy to remove the molded shoe sole material from the shoe sole material mold if the longitudinal cross-sectional shape is tapered from the upper side to the lower side.

  In the present invention, the unvulcanized rubber fabric is mainly composed of one or a mixture of two or more of natural rubber, styrene butadiene rubber, butadiene rubber, isoprene rubber, high styrene rubber, acrylonitrile rubber, chloroprene rubber and the like. , Vulcanizing agents, vulcanizing aids, vulcanization accelerators, fillers, pigments, stabilizers and other common chemicals for rubber compounding are added and mixed with Banbury mixers, hensil mixers, mixing rolls, kneaders, etc. These are mixed, sheeted with a roll, and appropriately cut into a shape.

  The short fibers 3 added to the unvulcanized rubber fabric are glass fiber, aramid fiber, acrylic fiber, nylon fiber, cellulose fiber, rock wool, rock wool, quartz fiber, silica fiber, wollastonite fiber, ceramic fiber, etc. Hard fibers made of one or a mixture of two or more of inorganic fibers, metal fibers, carbon fibers and the like are used. The short fibers 3 have a diameter of 0.05 μm to 30 μm and a length of 0.1 mm to 20 mm.

The first unvulcanized rubber R1 is prepared by adding short fibers to the unvulcanized rubber and sheeting with a roll so as to be oriented in the longitudinal (rolling) direction and the horizontal direction of the rubber sheet to prepare a thin rubber sheet. . Similarly to the first unvulcanized rubber, the second unvulcanized rubber R2 is sheeted by adding a short fiber to the unvulcanized rubber, and is thicker than the first unvulcanized rubber R1. Prepare the sheet. In addition, prepare a non-woven fabric having the same area as the rubber sheet.

If necessary, the unvulcanized rubber fabric R1 may be made of a different material (color) on the bottom of the projections if a different pigment from the pigment added to the unvulcanized rubber R2 is added. Since it is formed, it has a visually aesthetic effect.

The first unvulcanized rubber R1 and the second unvulcanized rubber R2 are blended at a ratio of 5 to 50 parts by weight of short fibers with respect to 100 parts by weight. Also, the first unvulcanized rubber R1 has a hardness after molding of the shoe sole of 40 to 60 degrees (spring type hardness tester A type according to JIS-K6301 vulcanized rubber physical test method), and the second unvulcanized rubber. The hardness of the rubber R2 was 65 to 90 degrees.

  In the shoe sole material of the present invention, the first unvulcanized rubber fabric R1 mixed with the short fibers 3, 3,... Prepared as described above was placed in the projection forming recesses 11, 11,. Thereafter, the second unvulcanized rubber fabric R2 mixed with the short fibers 3 is placed thereon, and the non-woven fabric F is further set thereon and heated and pressurized by a conventional method. Then, the first unvulcanized rubber cloth R1 flows while maintaining the horizontal state as it is by the pressure and stays on the bottom surface of the projection forming recesses 11, 11,... And unvulcanized with the short fibers 3, 3,. In the rubber fabric R2, the short fibers 3, 3,... Flowing into the inflow holes 12, 12,. Therefore, in the shoe sole material of the present invention, the first unvulcanized rubber R1 is oriented in parallel with the bottom surface at the outer peripheral portion of the bottom surface of the shoe projection, and the second unvulcanized rubber R2 is oriented in parallel with the bottom surface. The short fibers 3, 3... Are oriented in the vertical direction from the upper part 111 to the lower part 112 of the projection forming concave part.

  The shoe sole material 4 thus heated and pressurized and vulcanized and formed is oriented substantially vertically at the center of the bottom surface of the shoe sole projection by removing the bottom portions 411, 411... Of the projection 41 with a grinder or the like. The short fibers 3, 3... Are exposed on the bottom surface, and a shoe sole material in which the short fibers are oriented in the horizontal direction is formed on the outer periphery of the bottom surface of the protrusion. In addition, the molded shoe sole material is formed so that the rising angle of the outer peripheral wall of the bottom surface of the protrusion is substantially perpendicular. The obtained shoe sole material is laminated and adhered to a conventional shoe sole body made of rubber, urethane, EVA or the like through a nonwoven fabric F bonded to the upper surface of the shoe sole material.

The area of the short fibers 3 oriented in a substantially vertical direction is preferably about 10 to 60% with respect to the area of the bottom surface of the protrusion. If the area ratio occupied by the bottom surface of the protrusion is 10% or less, the flow rate of the unvulcanized rubber is increased because the inflow hole is narrower than the bottom surface of the protrusion, and the short fibers are more likely to stand in the vertical direction. The area occupied by the short fibers decreases, and if it is 60% or more, the area occupied by the short fibers increases, but the flow rate of the unvulcanized rubber is slowed because the inflow holes are larger than the bottom surface of the protrusions. This is because it tends to be difficult to stand in the vertical direction and the anti-slip property tends to decrease.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a main part showing a molded state of the shoe sole material, FIG. 2 is a cross-sectional view of the main part of the shoe sole material taken out from the shoe sole material molding die, and FIG. It is principal part sectional drawing. FIG. 4 is an enlarged photograph of a state in which the glass fiber protrudes in a substantially vertical direction from the bottom surface of the protrusion. Reference numeral 1 is a shoe sole molding die, reference numeral 11 is a projection forming recess, reference numeral 110 is an outer peripheral wall, reference numeral 111 is an upper part, reference numeral 112 is a lower part, reference numeral 12 is an inflow hole, reference numeral 13 is a rising angle, reference numeral R1 is glass First unvulcanized rubber fabric mixed with fibers, symbol R2 is a second unvulcanized rubber fabric mixed with glass fibers, symbol F is a nonwoven fabric, symbol 3 is a short fiber, symbol 4 is a shoe sole, symbol 41 Indicates a protrusion, reference numeral 410 indicates a bottom surface, and reference numeral 411 indicates a bottom portion.

The first unvulcanized rubber is a mixture of natural rubber based styrene butadiene rubber blended with 100 parts by weight of rubber, 15 parts of glass fiber, and other rubber compounding chemicals, and kneaded with a kneader. A rubber sheet having a thickness of 1 mm that is oriented in the longitudinal direction of the rubber sheet with a rolling roll is prepared. In addition, the second unvulcanized rubber is made of natural rubber based on 100 parts by weight of a rubber main component blended with styrene butadiene rubber, 25 parts of glass fiber, and other rubber compounding chemicals are added to make it anti-slip, A kneader kneaded product is used to prepare a rubber sheet having a thickness of 4 mm with a rolling roll.

A detailed blending table of the first unvulcanized rubber and the second unvulcanized rubber is as follows.

The shoe sole material forming die 1 has a plurality of protrusion-forming recesses 11 each having a width of 6 mm, a length of 20 mm, and a height of 4.5 mm, and the rising angle of the outer peripheral wall of the bottom surface of the protrusion being perpendicular. In addition, an inflow hole 12 having an upper base of 2 mm, a lower base of 1.6 mm, a length of 20 mm, and a depth of 4 mm is provided at the center of the bottom surface of each projection forming recess 11. Then, the prepared sheet of the first unvulcanized rubber fabric R1 containing 1 mm-thick glass fiber is horizontally placed in the projection forming recess 11 of the shoe sole-forming mold 1, and 4 mm-thick glass fiber is placed thereon. Place the unvulcanized rubber fabric R2 sheet overlaid, place the nonwoven fabric F, and heat and press for 6 minutes at 150 ° C. and 50 kg / cm ² to form protrusions, then remove from the shoe sole material mold 1 The bottom portion 410 of the projections 41, 41... Of the shoe sole material is buffed to complete the shoe sole material 4 of the present invention.

The completed shoe sole material 4 is formed of a rubber member having a rising angle 13 of the outer peripheral wall of the projection 41 at a substantially right angle and having a hardness difference in the bottom portions 411, 411,. As shown in FIG. 4, the glass fiber 3 blended with the first unvulcanized rubber R1 is oriented in the substantially horizontal direction in the vicinity of the outer peripheral portion of the bottom surface of the protrusion, and the second unexposed portion in the vicinity of the central portion of the bottom surface of the protrusion. A shoe sole material was obtained in which the glass fibers 3 blended in the vulcanized rubber R2 were oriented in a direction substantially perpendicular to the ground contact surface and the short glass fibers 3 were exposed from the center of the bottom surface of the protrusions.

The hardness of the molded shoe sole material was 75 degrees for the rubber member blended with the glass fiber 3 at the center of the bottom surface of the protrusion, and 55 degrees for the rubber member blended with the glass fiber at the outer periphery of the bottom surface of the protrusion. In the shoe sole material of the obtained example, the ratio of the area of the center of the bottom surface of the protrusions in which the glass fibers were oriented in the substantially vertical direction was 33% of the area of the bottom surface of the protrusions.

As shown in the above formulation table, the comparison of the dynamic friction coefficients of the examples (containing glass fibers + containing glass fibers) and the comparative examples (containing glass fibers + no glass fibers) is as follows.
Examples Comparative Example Dynamic Friction Coefficient Granite DRY 0.85 0.80
Granite WET 0.58 0.52
On ice 0.52 0.37

  As is apparent from the above results, the shoe sole material of the present invention is cut and polished with a glass fiber fixed with a hard rubber member on the ice surface and with a projection edge on the wet floor surface. On a dry floor such as stone, a soft rubber member with glass fibers oriented in the horizontal direction gives flexibility and strength in the horizontal direction to improve sliding resistance and exert a grip effect. In addition, the shoe sole material of the present invention has durability and wear resistance because the projection is composed of a rubber member in which short glass fibers are oriented in a substantially horizontal direction and a substantially vertical direction as described above.

It is principal part sectional drawing which shows the molding state of a shoe sole material. It is principal part sectional drawing of the shoe sole material taken out from the shoe sole material shaping | molding die. It is principal part sectional drawing of the completed shoe sole material. It is the photograph which expanded the state which the glass fiber exposed from the protrusion bottom face in the substantially perpendicular direction.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Shoe-sole material shaping | molding die 11 ... Projection shaping | molding recessed part 110 ... Outer peripheral wall 111 ... Upper part 112 ... Lower part 12 ... Inflow hole 13 ... Rising angle R1 ... Unvulcanized rubber cloth R2 mixed with short fiber ... Short fiber Mixed unvulcanized rubber fabric 3 ... short fibers 4 ... sole material 41 ... projections 410 ... bottom 411 ... bottom F ... nonwoven fabric

Claims (3)

In sole material made of upper and lower two layers blended with short fibers in the rubber cloth, the large number of independent projections on the sole member underside is provided, the bottom surface of the rising angle of the bottom outer peripheral wall of the protrusion by the lower sole member The short fibers are oriented substantially horizontally with respect to the bottom surface in the vicinity of the outer peripheral portion of the bottom surface of the protrusion, and in the substantially vertical direction near the center portion of the bottom surface of the protrusion by the upper shoe sole material. orientation to expose the bottom surface of the projections, yet wherein the sole material in the vicinity of the bottom surface central portion a higher hardness than the sole member in the vicinity of the bottom peripheral portion, and and with the fabric the sole member upper surface Shoe sole material. In a shoe sole material molding die having an inflow hole in the center of the bottom surface of the bottom surface of the projection molding recess, the rising angle of the bottom outer peripheral wall of a large number of independent projection molding recesses is substantially parallel to the longitudinal direction of the rubber sheet. The first unvulcanized rubber fabric in which short fibers are oriented and the second unvulcanized rubber fabric in which short fibers are mixed are sequentially placed and laminated in two layers, and further the fabric is placed thereon. After that, the unvulcanized rubber fabric is heated and pressed to provide a cloth on the upper surface of the shoe sole, and the protrusion forming recess is filled and allowed to flow into the inflow hole, so that the rising angle of the outer peripheral wall of the bottom of the protrusion becomes the bottom surface. substantially right angles to form against, oriented in a substantially horizontal direction of short fibers of the first unvulcanized rubber with respect to the bottom surface in the vicinity of the bottom surface outer circumferential portion of the projection forming recess, also in the vicinity of the bottom surface center portion of the projection forming recess Bottom fiber of the second unvulcanized rubber After the protrusions are integrally molded in a direction substantially perpendicular to the protrusions, the bottom of the protrusions are buffed to make the rising angle of the protrusion outer peripheral wall a right angle, and the formed protrusions are formed into the first rubber cloth and the second rubber cloth. And forming a shoe sole material, wherein the short fibers are exposed in a substantially vertical direction at the center of the bottom surface of the projection. The hardness of the first unvulcanized rubber in the vicinity of the outer peripheral portion of the bottom surface of the projection after molding is 40 to 60 degrees, and the hardness of the second unvulcanized rubber in the vicinity of the center portion of the bottom surface of the protrusion is 65 to 90 degrees. The method for forming a sole material according to claim 2 , wherein the sole material is formed to a degree.