JPH0556801A - Sport shoe and method for manufacturing the same - Google Patents

Abstract

PURPOSE:To provide sport shoe having light weight, excellent antiwear property and durability by forming an intermediate sole of soft foamed body and main soles of hard body integrally with synthetic resin. CONSTITUTION:When an intermediate sole 4 and main soles 5 are formed integrally with synthetic resin, an injection molding machine is used to inject melted hard body of any synthetic resin on the ground contacting side surface of the intermediate sole 4 made of any synthetic resin soft foamed body to manufacture sport shoe having main soles 5 formed to be stuck integrally to the ground contacting side surface of the intermediate sole 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to sports shoes and a method for manufacturing the same.

[0002]

2. Description of the Related Art Marathon shoes and jogging shoes are required to be lightweight and have shock absorbing properties and good mobility. Therefore, the outsole is a lightweight sole marathon shoe that is integrally formed of a synthetic resin soft foam with an uneven pattern on the ground contact side surface, and a synthetic sole that is made of a synthetic resin soft foam, and a synthetic sole. A jogging shoe having a shoe sole in which a hard sole of resin is used to form a concavo-convex pattern on the surface as a separate body, and the sole is integrally bonded to the grounding surface side surface of the joint bottom, and JP-A-1-310601. An invention relating to a "method for manufacturing a shoe sole" in which a protrusion made of a liquid polyurethane resin composition is formed on the surface of an outsole made of a nonwoven fabric sheet is also proposed.

[0003]

However, in the case where the outsole is integrally formed of a synthetic resin soft foam having an uneven pattern on the ground contact side surface, the entire outsole is made of a synthetic resin soft foam. Since it is formed, it has poor wear resistance and has a defect that the shoe sole is worn away immediately. In addition, a synthetic bottom made of a soft foam of synthetic resin and a main bottom having a concavo-convex pattern made of a hard body of synthetic resin are formed separately, and the main bottom is integrally bonded to the ground-side surface of the synthetic bottom. There is no problem in terms of abrasion resistance, but since the bottom surface is buffed (polished) on the bonding surface when it is bonded to the bottom, even if this bottom is made as thin as possible. Since the thickness of the shoe sole becomes thicker and the shoe sole becomes heavier and heavier, the concavo-convex pattern part is integrally connected and the hard body sole is inferior in flexibility and mobility is hindered. It had the drawback. In addition, the one in which the projection made of the liquid polyurethane resin mixture is formed on the surface of the outsole made of the non-woven sheet is
There is a drawback in that a polyurethane resin film has to be formed on the surface of the non-woven fabric sheet in order to increase the fixing force of the projections made of the liquid polyurethane resin composition, which complicates the process.

[0004]

Therefore, according to the present invention, the bottom portion fixed to the lower surface of the instep portion has a joint bottom formed of a soft foam of an arbitrary synthetic resin, and an arbitrary synthetic resin is formed on the ground-side surface of the joint bottom. The present invention provides a sports shoe in which a hard body of (3) is directly melt-injected to form an insole integrally fixedly formed, and the instep and the bottom are integrally fixed together. Using a molding machine (injection machine), sports shoes in which a hard body of synthetic resin is melt-injected onto the surface of the grounding surface of the joint bottom housed in a mold to integrally form an outsole having an uneven pattern, and a manufacturing method thereof. Is.

[0005]

In the sports shoe of the present invention, the bottom of the bottom, which is integrally fixed to the lower surface of the instep, is formed of a soft foam of an arbitrary synthetic resin, and the hard body of the arbitrary synthetic resin is melt-injected onto the ground contact surface. Since the outsole is integrally fixed and formed, and the uneven pattern on the outsole is formed independently, it has the effect of reducing the durability and impact during running without impeding the flexibility of the outsole. ..

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the drawings. First, an upper 2 made of leather, a synthetic resin, an arbitrary woven fabric, or a composite material of these, and an upper part A made of a midsole 1 and a core 3 made of leather, a synthetic resin, an arbitrary woven fabric, or a composite material of these are formed. To do. Next, the synthetic bottom 4 is formed of soft urethane foam, EVA (ethylene vinyl acetate), polyethylene, PVC (polyvinyl chloride), or a synthetic resin soft foam having the same effect. For example, the bottom 4 of marathon shoes is EVA
When formed by, the EVA soft foam has a density of 0.13 to
0.15g / cm ³ , hardness 35-40C (Asker hardness tester)
Tensile strength 13-14Kg / cm ² , elongation 190-220
%, Tear strength of 6 to 7 kg / cm. When the synthetic sole 4 of the golf shoe is made of polyurethane, the soft polyurethane foam has a density of 0.6-
0.7g / cm ³ , hardness 78-82C (Asker C hardness meter), tensile strength 52-63Kg / cm ² , elongation 400-5
It is formed of a soft foam having a tear strength of 26 to 30 kg / cm and a tear strength of 00%. Then, the combined bottom 4 is engraved so as to be compressed by 25% and is inserted and fixed in the combined bottom housing portion 8 of the lower mold 7 with the surface on the grounding side facing up, and the upper surface of the lower mold 7 corresponds to the bottom. Upper mold 6 formed with an injection gate E that connects the space D, the resin injection port C, the space D corresponding to the outsole, and the resin injection port C.
Is placed and the mold is clamped, and a hard body of polyurethane, EVA (ethylene vinyl acetate), polyethylene, PVC or other synthetic resin having the same effect as these is melt-injected from the injection port C using an injection molding machine. The bottom 5 is formed by integrally fixing the outsole 5 to the ground-side surface of the joint bottom 4. Next, the bottom B is integrally fixed to the lower surface of the instep A to form a sports shoe. The combination of the synthetic resin used for the joint bottom 4 and the outsole 5 can be arbitrarily selected and used, but if a soft foam and a hard body of the same series of synthetic resin are used, the melt fixation becomes firm. In addition to the thermoplastic synthetic resin, a thermosetting polyurethane resin composed of polyurethane elastomer and isocyanate can also be used.
Further, the fixing of the joint bottom 4 and the main bottom 5 is achieved by fusion bonding or reaction of the synthetic resins without using an adhesive.

[0007]

EFFECTS OF THE INVENTION The sports shoe of the present invention has the above-mentioned structure. When a synthetic resin hard body is directly injection-molded on a synthetic bottom 4 which is conventionally made of a synthetic resin soft foam, burrs are produced or chipped. Although the molding failure of the outsole 5 occurred, the present invention uses an injection molding machine (injection machine) to form the shoe sole A, and burrs are produced or chipped by compressing the aforesaid sole 4 by 25% with a mold. It is possible to eliminate molding defects such as swelling and productivity is improved, and since the outsole 5 is formed of a hard body, sports shoes having excellent wear resistance and good durability can be obtained.

Further, since the concavo-convex portion of the main bottom 5 which is integrally melted and fixed to the joint bottom 4 is formed separately from each other, the flexibility of the joint bottom 4 made of a synthetic resin soft foam is not impaired. Sports shoes with good motility can be obtained.

[Brief description of drawings]

FIG. 1 is a side view of a sports shoe of the present invention.

FIG. 2 is a plan view of a shoe sole of the sports shoe of the present invention.

FIG. 3 is a sectional end view taken along the line YY of FIG.

FIG. 4 is an embodiment drawing showing a method for manufacturing the sole of the sports shoe of the present invention.

[Explanation of symbols]

 1 Midsole 2 Upper 3 Middle core 4 Combined bottom 5 Outsole 6 Upper mold 7 Lower mold 8 Combined bottom storage part A Upper part B Bottom part C Inlet D Space equivalent to the bottom part E Injection gate

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location B29C 45/16 7344-4F B32B 5/18 27/08 7258-4F 27/28 101 6122-4F / / B29K 105: 04 4F B29L 9:00 4F 31:50 4F

Claims (9)

[Claims] 1. A bottom B composed of an optional bottom 4 and a book bottom 5 is integrally fixed to the lower surface of an instep A composed of an upper 2 made of an arbitrary material, an insole 1 and a core 3. In the sports shoe, the bottom portion B is characterized in that the joint bottom 4 is formed of a soft foam made of an arbitrary synthetic resin, and an uneven outsole 5 made of a hard body made of an arbitrary synthetic resin is integrally fixedly formed on the grounding surface side surface thereof. And sports shoes. 2. The bottom portion B accommodates a synthetic bottom 4 made of a soft foam made of an arbitrary synthetic resin in a synthetic bottom storage portion 8 provided in a lower mold 7 with the ground surface side surface facing upward. On the upper surface of the mold 7,
The upper mold 6 having an injection gate E connecting the space D corresponding to the bottom bottom and the resin injection port C and the space D corresponding to the bottom bottom and the resin injection port C is placed and clamped. Using an injection molding machine from the inlet C, a hard body of an arbitrary synthetic resin is melt-injected to form a bottom 4
The sports shoe according to claim 1, wherein the outsole 5 is integrally fixedly formed on the ground contact surface side surface of the sports shoe, and the method for manufacturing the same. 3. The sports shoe according to claim 1 and 2, wherein the bottom portion B is formed by forming a synthetic bottom 4 and an outsole 5 with a soft foam and a rigid body of the same type of synthetic resin. Method. 4. The sports shoe according to claim 1, 2 or 3, wherein the bottom portion B has a combined bottom 4 made of EVA soft foam and a main bottom 5 made of EVA hard body. And its manufacturing method. 5. The sports shoe according to claim 1, 2 or 3, wherein the bottom B has a synthetic bottom 4 formed of a soft polyethylene foam and a main bottom 5 formed of a hard polyethylene body. And its manufacturing method. 6. The sports shoe according to claim 1, 2 or 3, wherein the bottom portion B has a synthetic sole 4 formed of a soft polyurethane foam and a main sole 5 formed of a rigid polyurethane body. And its manufacturing method. 7. The sports shoe according to claim 1, 2 or 3, wherein the bottom portion B is formed of a soft foam of PVC at the joint bottom 4 and a hard body of PVC at the outsole 5. And its manufacturing method. 8. The sports shoe according to claim 1, wherein the bottom portion B is formed by forming a synthetic bottom 4 and an outsole 5 with a soft foam and a rigid body of different types of synthetic resin, and manufacturing thereof. Method. 9. The sports shoe according to claim 1, 2 or 9, wherein the bottom portion B has a synthetic bottom 4 formed of a soft polyurethane foam and a main bottom 5 formed of a rigid PVC body. And its manufacturing method.