JPH0667321B2 - Method for manufacturing a grounded sole of an athletic shoe - Google Patents

Description

Description: TECHNICAL FIELD The present invention mainly relates to an improvement in a method for manufacturing a shoe sole of an athletic shoe, particularly a grounding sole that contacts the ground.

(Prior Art) The sole of a conventional sports shoe has a single body composed mainly of natural rubber, isoprene rubber, butadiene rubber, styrene butadiene rubber, polyurethane rubber or a mixture of two or more thereof, or a single body composed of a foam or the like. Some were formed of composites.

By the way, in recent years, marathon shoes, jogging shoes, and the like have a multi-structured shoe sole, that is, a grounded sole formed of solid rubber or high-density foam in order to reduce the weight of the shoe, improve impact resistance, and improve cushioning. There is provided a shoe sole having a single layer or a plurality of layers of foam such as EVA (ethylene vinyl acetate), which is lightweight and excellent in cushioning, on the upper surface side.

(Problems to be solved by the present invention) However, the conventional material for the grounding sole of the sole of the athletic shoe is to improve the ground gripping force and wear resistance of the non-slip projections provided on the grounding side. Inevitably, solid rubber having high specific gravity and hardness or high-density sponge rubber has to be used, which causes the shoes to become heavy. Therefore, the ground contact bottom should be as thin as possible so that the anti-slip projections provided on the ground contact surface side will not wear out early and lose its anti-slip effect. It was done.

However, the grounding bottom is a shrinkage of the filling material to be filled in the mold as well as the manufacturing process of the mold used in the manufacturing process, especially the molding process, or an adhesive surface for joining the intermediate bottom and the grounding bottom. Although it is necessary to consider the necessity of the thickness required for polishing, there was a limit to reduce the thickness of the ground contact bottom.

It is an object of the present invention to overcome the deficiencies of the conventional grounding sole of the athletic shoe of the present invention and the manufacturing method thereof, and to obtain a grounding sole that maintains an effective and long-lasting anti-slip action. An upper mold having a supply path and a net-like projection on the lower surface, a lower mold having a recess having a depth equivalent to the thickness of the nonwoven sheet on the upper surface, and a two-component or one-component polyurethane compound previously prepared Prepare a non-woven sheet formed by impregnating the front part or one side, fit the non-woven sheet into the recess of the lower mold, close the lower mold fitted with the non-woven sheet with the upper mold, and mesh the upper mold. Of a heat-resistant plastic resin having good wear resistance is melt-injected into a concave portion of a convex shape, and a molded product composed of a protrusion and a depression of the heat-resistant plastic resin is integrally bonded to the nonwoven fabric sheet. Mainly, the contact of the soles of sports shoes is characterized by The bottom method for producing it is an novel means.

(Operation and Effect) In the method for manufacturing the ground contact sole of the athletic shoe according to the present invention, the elasticity of the nonwoven fabric sheet 1 and the depth of the recess 6 of the lower mold b are slightly smaller than the thickness of the nonwoven fabric sheet 1. Therefore, the upper mold a can not only prevent the melt-injected thermoplastic resin from flowing out, but also firmly connect the projections 3 by forming the mesh-shaped projections 3 shaped depressions 5 on the lower surface side.

In addition, since the non-woven fabric sheet 1, the polyurethane elastomer layer 2 and the protrusions 3 are integrally connected to the grounding sole of the shoe sole of the sports shoe manufactured according to the present invention, the protrusions 3 having good wear resistance are formed in a mesh shape. Protruding to keep the anti-slip action effective and long.

(Embodiment) First, a method of manufacturing a grounding sole of a shoe sole of an athletic shoe according to the invention described in claim 3 is as follows.
That is, an upper die a and a lower die b of a grounding bottom molding machine as shown in FIGS. 1 to 3 and the like, and a nonwoven fabric sheet 1 as shown in FIG.

The upper mold a has a branch-shaped supply passage 8 that links the thermoplastic resin melt-injected to the upper surface side with the first main supply passage 7 and the mesh-shaped projection 3-shaped depression 5 on the lower surface side. It is provided. Similarly, the lower mold b is provided with a concave portion 6 on the upper surface side, into which the non-woven fabric sheet 1 is fitted. The non-woven fabric sheet 1 is preliminarily impregnated or coated with a two-component or one-component polyurethane compound on all or most of it or one surface thereof, for example, the surface thereof.

Next, as shown in FIGS. 3 to 3, the main manufacturing steps of the grounding sole A of the sole of the sports shoe according to the present invention will be described below. That is, the non-woven fabric sheet 1 is fitted into the recess 6 of the lower mold b with its surface facing upward. The nonwoven fabric sheet 1 is preferably made of a relatively thick and elastic material having a thickness of about 0.2 to 0.3 mm in order to prevent the thermoplastic resin melt-injected on the surface side thereof from flowing out. Further, the recess 6 and the nonwoven fabric sheet 1 of the lower mold b may have a planar shape corresponding to a size capable of forming a large number of ground bottoms A, or one foot or one foot. The concave portion 6 is provided at a depth slightly smaller than the thickness of the non-woven sheet 1, and has a depth such that the concave edge 10 of the mesh-shaped projection 3 is pressed to some extent, and the non-woven sheet 1 is a lower mold. It is preferably fitted so as to be exposed somewhat from the recess 6 of b. Therefore, as shown in FIG. 3 II, when the lower mold b is closed by the upper mold a, the non-woven fabric sheet 1 is in contact with the concave edge 10 of the mesh-shaped projection 3 on the lower surface side of the upper mold a.
Will be pressed by the recessed edge 10.

Next, a predetermined amount of molten thermoplastic resin is passed under constant pressure and temperature from the nozzle (4) through the main supply path 7 of the upper mold a, the branched supply paths 8 and the like to form a mesh shape of the upper mold a. It is supplied into the cavity formed by the recess 5 of the protrusion 3 and the non-woven sheet 1. The molten thermoplastic resin supplied into the cavity described above does not flow outward by the recessed edges 10, and conversely due to the pressure of the supplied melted thermoplastic resin, the inside of the recessed edges 10 is reversed. The non-woven fabric sheet 1 part is strongly pressed, and the thermoplastic resin is bonded so as to bite into the polyurethane elastomer layer 2 and the non-woven fabric sheet 1, so that the projections 3 having good abrasion resistance and a mesh shape are the non-woven fabric sheet. It was possible to form the grounding bottom A formed by firmly bonding to 1 and the polyurethane elastomer layer 2. At this time, the recess edge 9 of the recess 6 on the upper surface side of the lower mold b of the molding machine for the grounding bottom A is one leg of the shoe sole or a long shape having a lateral width of one foot or more, or one or both legs of the grounding bottom. Is formed. Further, the nonwoven fabric sheet 1 is cut and formed in the same shape as the recess edge 9 of the recess 6. The thermoplastic resin forming the mesh-shaped projections 3 having good wear resistance is
It may be selected from polyester resin, polyamide resin, polyurethane elastomer or the like, but polyurethane elastomer is preferable in consideration of good wear resistance and bondability with the polyurethane elastomer layer 2.
As described above, the grounding bottom A formed in the desired shape is mainly for the rear bottom part of the grounding bottom of the athletics spike shoe or all the other grounding bottoms of the running shoes. It can be provided as a shoe sole for athletics spike shoes or other running shoes by joining a midsole or a wedge sole formed of rubber or a bottom plate with spikes.

Further, in the above-mentioned manufacturing method, since the depressions 5 of the protrusions 3 are in the form of a mesh, the flow of the thermoplastic synthetic resin melt-injected is bad and the small protrusions are molded like many independent small protrusions. There is no such thing as damaging.

Next, the ground sole A of the athletic shoe according to the invention described above is shown in FIG.
As indicated by III to III, a polyurethane elastomer layer 2 is provided on one surface, for example, the surface of the nonwoven fabric sheet 1, and projections 3 are formed on the polyurethane elastomer layer 2 in a mesh shape. In order to improve the adhesion with the polyurethane elastomer layer 2, it is preferable that the mesh-like projections 3 have a wider bottom surface, that is, an enlarged adhesion area. The mesh formed by the protrusions 3 may have a polygonal plane such as a triangle, a quadrangle, a hexagon, or a circular shape such as a circle, an ellipse, an oval, or any other shape. Each mesh may be continuous, and each projection 3 may have one or a plurality of small projections 11 or small depressions 12 formed in a part of its ground plane. These small protrusions 11 and small recesses 1
2 can promote the non-slip action of the mesh-shaped projections 3.

As described above, since the protrusions 3 of the grounding bottom A according to the present invention are continuous in a mesh shape, they are not worn by strong contact friction with the ground and are not easily broken or peeled.

[Brief description of drawings]

FIGS. 1 to 3 show a ground bottom molding machine used in the manufacturing method according to the first aspect of the present invention, where I is a schematic plan view of the upper mold, and II is the same. A schematic cross-sectional view of the upper mold is shown, and III is a schematic cross-sectional view of the lower mold. FIG. 2 shows a non-woven sheet similarly used in the above-mentioned manufacturing method.
Is a schematic cross-sectional view, and II is a schematic cross-sectional view of the nonwoven fabric sheet impregnated or coated with the polyurethane compound. FIGS. 3A to 3I are schematic cross-sectional views showing the manufacturing process according to the manufacturing method. Fig. 4 I to II
I is a schematic diagram showing a grounding sole of an athletic shoe manufactured by the manufacturing method of the present invention, I is a partially cutaway plan schematic view showing a bottom view thereof, and II and III are partially enlarged sectional views thereof. It is an example. (Symbols in the Drawings) A ... Grounding bottom, B ... Grounding bottom molding machine, a ... Molding machine upper mold, b ... Same lower mold, c ... Same auxiliary mold, 1 ... Nonwoven sheet, 2 ... Polyurethane elastomer layer 3 ... Protrusion, 4 ... Nozzle, 5 ... Recess, 6 ... Recess, 7 ... Main supply path, 8 ... Branch supply path, 9 ... Recess edge, 10 ... Recess edge, 11 ... Small projection, 12 ... Small recess,

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location A43D 65/02 7421-4F B29C 45/14 7344-4F 45/16 7344-4F // B29K 75: 00 105: 20 B29L 31:50 4F

Claims (1)

[Claims] 1. A lower mold having a main supply path and a branch supply path on the upper surface side and a planar mesh-like projection on the lower surface side, and a recess having a depth corresponding to the thickness of the nonwoven fabric sheet on the upper surface side. Type and
A non-woven sheet is prepared by previously impregnating a front part or one surface of a two-part or one-part polyurethane compound, and the non-woven sheet is fitted into the recess of the lower mold,
The non-woven sheet is fitted in the recess of the lower mold, the lower mold fitted with the non-woven sheet is closed by the upper mold, and the abrasion resistance is good in the mesh-shaped projection-shaped recess of the upper mold. A grounding sole of a shoe sole of an athletic shoe, characterized in that a thermoplastic resin to be manufactured is melt-injected, and a formed product of a protrusion and a recess of the thermoplastic resin is integrally bonded to the non-woven fabric sheet. Manufacturing method.