WO2019202716A1

WO2019202716A1 - Method for producing composite material for shoes, mold, and composite material for shoes

Info

Publication number: WO2019202716A1
Application number: PCT/JP2018/016212
Authority: WO
Inventors: 健一原野; 義範藤田; 志雄郭
Original assignee: 株式会社アシックス; 加久企業股▲ふん▼有限公司
Priority date: 2018-04-19
Filing date: 2018-04-19
Publication date: 2019-10-24
Also published as: JPWO2019202716A1; JP7075992B2

Abstract

The present invention provides a method for producing a composite material for shoes, the method involving obtaining a composite material for shoes in which a foamed particle layer and shoe parts are integrated by a specific method.

Description

Shoe composite manufacturing method, mold, and shoe composite

The present invention relates to a method for manufacturing a composite material for shoes, a mold, and a composite material for shoes.

Shoes have not only the function of protecting feet but also various functions depending on the usage and place of use, and there are significant business opportunities in the shoe industry. When walking with a shoe having an impact absorbing portion, the impact absorbing portion can prevent the repulsive force when stepping on the ground from being directly transmitted to the lower limbs. For this reason, many shoes having an impact absorbing material (foamed material, air cushion, etc.) have been made. For example, shoes having an impact absorbing material as a member for a sole are known.

In the Taiwan utility model M513603, the Taiwan utility model M467338, the Taiwan utility model M403227, and the Taiwan patent I519401, the member for the sole is produced by the foaming method. These three utility models in Taiwan use EVA (ethylene-vinyl acetate copolymer) resin foam. After the resin is put in the mold, heating and pressure foaming is performed. In the Taiwan patent, TPU (thermoplastic polyurethane) is placed in a mold and foamed.

Taiwan Utility Model M513603 Taiwan Utility Model M467338 Taiwan Utility Model M403227 Taiwan Patent I519401

In the above-mentioned patent, TPU foaming technology is used, and the obtained shoe sole member has excellent elasticity and is difficult to be permanently deformed by compression, but an adhesive is applied to the foamed shoe sole member. It is necessary to apply and apply a shoe part made of rubber or EVA having wear resistance and anti-slip function. Therefore, it takes time to apply the adhesive. It is also required to increase the adhesive strength between the shoe parts and the shoe sole member.

In addition, a vertical large-area mold is required so that it can be industrially mass-produced, and a conventional TPU foaming uses a mold capable of vertical foaming. In the present invention, it was considered to install a TPU foaming mold that has never been installed horizontally.

In the present invention, by foaming in the mold, the bonding strength between the shoe parts and the foamed particle layer is high, and the step of applying an adhesive can be omitted, and a composite material for shoes can be easily obtained in a short time. While providing the manufacturing method of the composite material for shoes, it aims at providing a metal mold | die and the composite material for shoes.

The method for manufacturing a shoe composite material according to the present invention includes placing a shoe part in a cavity of a mold, and fixing the horizontal position of the shoe part in the cavity,
Packing foam particles in the cavity, stacking the foam particles on the surface of the shoe part,
The air in the cavity is discharged out of the cavity, and the inside of the cavity is evacuated,
By injecting steam into the cavity and heating the inside of the cavity, the foamed particles are melted and foamed, the foamed particles are adhered to each other, and the foamed particles are adhered to the shoe parts,
Injecting a cooling liquid into the cavity, cooling the cavity,
A shoe composite in which the shoe parts are bonded to the surface of a foamed particle layer formed by foaming the foamed particles to obtain a composite material for shoes in which the foamed particle layer and the shoe parts are integrated. It is a manufacturing method of material.

The mold according to the present invention is a mold having an upper mold and a lower mold,
By overlapping the upper mold and the lower mold, a cavity is formed between the upper mold and the lower mold,
The bottom of the cavity has a fixed position for fixing the horizontal position of the shoe parts,
Foam formed by foaming the foamed particles by fixing the horizontal position of the shoe part at the fixed position and filling the cavity with foamed particles and then foaming the foamed particles. The shoe part is bonded to one surface of the particle layer to produce a shoe composite material in which the foamed particle layer and the shoe part are integrated.

Furthermore, the composite material for shoes according to the present invention has a foamed particle layer formed by stacking a plurality of foamed particles having non-uniform particle diameters, and
One or two or more shoe parts arranged at a front end, a rear end, or an intermediate position between the front end and the rear end of one surface of the foamed particle layer,
The shoe composite material in which the foamed particles foam in a mold and the foamed particle layer adheres to the shoe parts.

The flowchart of the manufacturing method of the composite material for shoes which concerns on this embodiment. The schematic diagram which puts the parts for shoes in a metal mold | die. The schematic diagram which stuffs foam particles in a metal mold | die. The schematic diagram which shows the state by which the foaming particle was packed in the metal mold | die. Schematic drawing that evacuates the mold. The schematic diagram which heats the inside of a metal mold | die with steam. The cross-sectional schematic diagram of a finished product. The flowchart of the manufacturing method of the composite material for shoes which concerns on other embodiment. FIG. 6 is a schematic diagram in which the distance between the upper mold and the lower mold is 1 to 2 mm while forming a cavity in another embodiment. In other embodiment, the schematic diagram which piled up two parts for shoes. It is a composite material for shoes which concerns on other embodiment, Comprising: The schematic diagram of the composite material for shoes provided with the foaming particle layer by which the gel particle and the foaming particle were mixed. The perspective view of a mixer. The side view of a mixer. The front view of a mixer. Sectional drawing of the front of a mixer. Sectional drawing of the front of a mixer (The figure which shows the state which is supplying several types of particle | grains to a mixing tank.). Sectional drawing of the front of a mixer (The figure which shows the state which is discharging | emitting the multiple types of particle | grains of a mixed state out of a mixing tank, mixing multiple types of particle | grains).

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows a flow chart of a method for manufacturing a composite material for shoes according to the present embodiment. In the method for manufacturing a composite material for shoes according to the present embodiment, parts for shoes are placed in a mold, foam particles are packed in the mold, the inside of the mold is evacuated, the inside of the mold is heated with steam, After the mold is cooled, the shoe composite is removed.

2 to 7 show the manufacturing method according to this embodiment in detail. The shoe part 1 is placed in the cavity 21 of the mold 2, and the horizontal position of the shoe part 1 is fixed at the fixing position 22 in the cavity 21. The shoe part 1 is formed of a single material, and the single material can be rubber. The fixed position 22 is a recessed pattern provided in the cavity 21 and may be provided at the front end, rear end, or intermediate position of the cavity 21 and may be provided at two or more locations. When the cavity 21 of the mold 2 is used for forming the outsole, the mold 2 may include only one cavity 21 or two or more cavities.

As shown in FIGS. 3 and 4, the foam particles 3 are packed into the cavity 21 of the mold 2, and a part of the foam particles 3 is stacked on the surface of the shoe part 1. The expanded particles 3 are EPOP (non-crosslinked TPU expanded particles). The present embodiment will be described by taking an example in which the particle diameter is uniform and a single type of foamed particle 3 is filled in the cavity 21 of the mold 2.

As shown in FIG. 5, the air in the cavity 21 is discharged out of the cavity 21, and the inside of the cavity 21 is made into a vacuum state. By discharging the air remaining in the cavity 21 to the outside of the cavity 21, the cavity 21 is in a vacuum state except for the part where the shoe part 1 and the foamed particles 3 are present.

As shown in FIG. 6, by injecting steam into the cavity 21 and heating the inside of the cavity 21, the foamed particles 3 are melted and foamed, and the foamed particles 3 are adhered to each other, and the foamed particles 3 are attached to shoe parts. Adhere to 1. The steam is water vapor, and the temperature of the water vapor is 100 ° C. or higher.

Coolant is injected into the cavity 21 to cool the inside of the cavity 21. After the mold 2 is cooled, water is poured into the mold 2 to keep the temperature of the mold 2 at 25 ° C. to 35 ° C.

As shown in FIG. 7, the shoe part 1 is bonded to the surface of the foamed particle layer 30 formed by foaming the foamed particles 3, and the foamed particle layer and the shoe part 1 are integrated. A shoe composite is obtained. That is, the plurality of foamed particles 3 after heat foaming constitute one foamed particle layer 30, and the shoe part 1 is bonded to the surface of the foamed particle layer 30. Moreover, in this embodiment and drawing, the example which combined the outsole and the non-slip shoe sole is shown.

As described above, the shoe part 1 and the foamed particle layer 30 can be integrated by foaming in the mold to obtain a composite material for shoes. Since the bonding strength between the shoe part 1 and the foamed particle layer 30 is high, the step of applying an adhesive can be omitted, and the composite material for shoes can be easily obtained in a short time, so that the object of the present invention can be achieved. I understand.

In FIG. 8, the flowchart of the manufacturing method of the composite material for shoes which concerns on other embodiment is shown.
A horizontal split mold is used as the mold. The mold has a lower mold and an upper mold.
FIG. 9 shows that the distance between the lower mold and the upper mold is 1 to 2, while forming the cavity between the lower mold and the upper mold before the foam particles are packed in the cavity of the mold according to this embodiment. A state of 2 mm is shown. The mold 2 is placed horizontally, the cavity 21 is formed by the lower mold and the upper mold, and the foamed particles are placed in the cavity 21 with the distance between the lower mold and the upper mold being 1 to 2 mm. Stuff. Then, the inside of the cavity 21 is evacuated in a state where the distance is reduced and the foamed particles 3 are compressed. While forming the cavity 21 with the lower mold and the upper mold, the entire cavity 21 is packed by filling the cavity 21 with foamed particles in a state where the distance between the lower mold and the upper mold is 1 to 2 mm. Since the foamed particles 3 can be packed into the cavity 21 in a state where the space of is large, a large amount of the foamed particles 3 can be packed into the cavity 21. Further, the inside of the cavity 21 is evacuated in a state where the distance is reduced and the foamed particles 3 are compressed, so that the inside of the cavity 21 is evacuated in a state where the foamed particles 3 are properly aligned. be able to.

FIG. 10 shows another embodiment. The shoe part 1 in FIG. 10 and the shoe part 10 have different functions, shapes, and uses. Further, the two

shoe parts

1 and 10 are directly stacked or arranged at intervals in the horizontal direction. When the two

shoe parts

1 and 10 are directly stacked, the horizontal position of one shoe part 1 is fixed in the cavity 21. The shoe parts are formed of different materials selected from RB, EVA, TPU, and foamed rubber.

In FIG. 11, in the step of packing the foam particles 3 in the cavity 21 of the mold 2 of the present embodiment, the gel particles 31 and the foam are used by using a single type of foam particles 3 (EPOP, non-crosslinked TPU foam particles). The composite material for shoes is shown in which the particles 3 are mixed and placed in the cavity 21, and the number of the gel particles 31 is smaller than the number of the foamed particles 3, and the gel particles 31 are polyurethane gel particles.

The mold according to the present embodiment includes an upper mold 24 and a lower mold 23, and a cavity 21 is formed between the upper mold 24 and the lower mold 23 by overlapping the upper mold 24 and the lower mold 23. And a fixing position 22 for fixing the horizontal position of the shoe part 1 is provided on the bottom surface of the cavity 21, and the horizontal position of the shoe part 1 is fixed at the fixing position 22. After the foamed particles 3 are filled in 21, the foamed particles 3 are foamed, whereby the shoe part 1 is bonded to one surface of the foamed particle layer 30 formed by foaming the foamed particles 3, A composite material for shoes in which the foamed particle layer 30 and the shoe part 1 are integrated is produced. The upper mold 24 includes a feeder for supplying expanded particles, a steam passage, a cooling water passage, and a discharge passage for discharging air to make the vacuum state, and the lower mold 23 includes a steam passage, A cooling water passage and a discharge passage for exhausting air to achieve the vacuum state are included.

By the manufacturing method described above, the foamed particle layer 30 is formed by stacking a plurality of foamed particles 3 with non-uniform particle diameters, and the front end, rear end, or front end of one surface of the foamed particle layer 30 is formed. The shoe part 1 is arranged at an intermediate position between the rear end and the rear part. A composite material for shoes in which the foamed particles 3 are foamed in the mold and the foamed particle layer 30 is adhered to the shoe part 1 can be produced.

Note that the method for manufacturing a composite material for shoes, the mold, and the composite material for shoes according to the present invention are not limited to the above-described embodiment. Moreover, the manufacturing method of a composite material for shoes according to the present invention, the mold, and the composite material for shoes are not limited by the above-described effects. Furthermore, the shoe composite material manufacturing method, mold, and shoe composite material according to the present invention can be variously modified without departing from the gist of the present invention.

For example, in the shoe composite material, when the foamed particles are formed of TPU (thermoplastic polyurethane) and the shoe part is formed of rubber, the shoe part includes a rubber layer formed of the rubber and A surface layer laminated with the rubber layer and formed of rubber and TPU, the surface layer and the foamed particle layer are bonded, and the rubber concentration of the rubber layer is the rubber concentration of the surface layer. Higher than that.
By having such a configuration, the composite material for shoes has an advantage that the bonding force between the shoe part and the foamed particle layer is increased.
The surface layer preferably contains a compatibilizer in addition to rubber and TPU.
The surface layer preferably contains 40 to 85% by mass of rubber, 10 to 40% by mass of TPU, and 5 to 20% by mass of the compatibilizer.

When supplying a plurality of types of particles including foamed particles (for example, a plurality of types of particles including gel particles and foamed particles) into a cavity in a method for producing a composite material for shoes, a plurality of types of particles are mixed in a cavity. It is preferable to supply in the tee. Specifically, it is preferable to mix a plurality of types of particles and supply a plurality of types of particles mixed by the mixing into the cavity. More specifically, it is preferable to supply a plurality of types of particles mixed by the mixing into a cavity from a mixer while mixing a plurality of types of particles with a mixer.
As shown in FIGS. 12 to 15, the mixer 100 includes a horizontal cylindrical mixing tank 101, a supply unit 102 for supplying plural kinds of particles into the mixing tank 101, and plural kinds of particles in the mixing tank 101. And a discharge unit 104 that discharges a plurality of types of particles mixed by the stirring to the outside of the mixing tank 101.
The mixer 100 is configured to supply a plurality of mixed particles from the discharge unit 104 to the cavity.
The stirring device 103 is arranged along a virtual central axis of the mixing tank 101 and rotates around the axis, and is attached to the shaft 131 and is formed on the cylindrical wall surface of the mixing tank 101 from the shaft 131. And a plate-like rotary blade 132 extending to the vicinity.
As shown in FIGS. 16 and 17, the mixer 100 supplies a plurality of types of particles 105 into the mixing tank 101 by the supply unit 102, and the plurality of types of particles 105 accumulated at the bottom of the mixing tank 101 by the supply. The rotating blades 132 are configured to be lifted up to the upper part of the mixing tank 101 by rotating.
That is, in the method for manufacturing a composite material for shoes, when the rotary blade 132 is rotated in a state where a plurality of types of particles are collected at the bottom of the mixing vessel 101, the plurality of types of particles collected at the bottom of the mixing vessel 101 are rotated. When the tip of the rotor blade 132 is raised to a position above the shaft 131, the plurality of types of particles roll in the shaft direction, and the plurality of types of particles are mixed.
Further, in the method for manufacturing a composite material for shoes, when a plurality of types of particles are supplied into the mixing tank 101 by the supply unit 102, they are likely to accumulate relatively downward among the plurality of types of particles due to the specific gravity and particle size. Particles (hereinafter, also referred to as “particles that tend to accumulate below”) exist, and multiple types of particles are unevenly distributed. In the manufacturing method of the composite material for shoes, particles that tend to collect downward are lifted along the wall surface of the mixing tank 101 by the rotary blades 132, and when the tip of the rotary blades 132 rises to a position above the shaft 131, they tend to collect downward. The particles roll from the wall surface side of the mixing tank 101 toward the shaft at a faster speed than other particles, and as a result, a plurality of types of particles are sufficiently mixed.
Further, the discharge unit 104 includes a discharge port 141 provided on the wall surface of the mixing tank 101 and a suction unit that sucks a plurality of types of mixed particles from the discharge port 141.
The discharge port 141 is provided above the shaft 131. In the circular cross section of the wall surface of the mixing tank 101, the angle θ between the vertex 111 of the wall surface of the mixing tank 101 and the center of the discharge port 141 is preferably 35 ° to 45 °.
In other words, in the method for manufacturing a composite material for shoes, the vertical position of the particles is adjusted by scooping up a plurality of types of particles and scooping up the particles that are relatively lower than the particles that are relatively upward. Invert to mix the multiple types of particles well. Then, a plurality of types of particles are taken out in a sufficiently mixed state.
Therefore, in the method for producing a composite material for shoes, a plurality of types of particles can be supplied into the cavity in a sufficiently mixed state.

1: parts for shoes, 10: parts for shoes, 2: mold, 21: cavity, 22: fixed position, 3: foamed particles, 30: foamed particle layer, 31: gel particles,
DESCRIPTION OF SYMBOLS 100: Mixer, 101: Mixing tank, 102: Supply part, 103: Stirrer, 104: Discharge part, 105: Plural kinds of particles, 111: Vertex, 131: Shaft, 132: Rotary blade, 141: Discharge port

Claims

Put the shoe part in the cavity of the mold, and fix the horizontal position of the shoe part in the cavity,
Packing foam particles in the cavity, stacking the foam particles on the surface of the shoe part,
The air in the cavity is discharged out of the cavity, and the inside of the cavity is evacuated,
By injecting steam into the cavity and heating the inside of the cavity, the foamed particles are melted and foamed, the foamed particles are adhered to each other, and the foamed particles are adhered to the shoe parts,
Injecting a cooling liquid into the cavity, cooling the cavity,
The shoe parts are bonded to the surface of the foamed particle layer formed by foaming the foamed particles to obtain a composite material for shoes in which the foamed particle layer and the shoe parts are integrated.
A method for manufacturing a composite material for shoes.
The method for producing a composite material for shoes according to claim 1, wherein the shoe parts are formed of a single material, and the single material is rubber.
As the shoe parts, two shoe parts of different materials are used, and by directly stacking these shoe parts, the horizontal position of one shoe part is fixed in the cavity, The method for manufacturing a shoe composite material according to claim 2, wherein the shoe part is formed of a different material selected from RB, EVA, TPU, and foamed rubber.
The steam is steam at 100 ° C. or higher,
The shoe composite material according to any one of claims 1 to 3, wherein after the mold is cooled, water is poured into the mold to maintain the temperature of the mold at 35 ° C to 25 ° C. Method.
As the mold, a horizontally divided mold is used, and the mold has a lower mold and an upper mold,
While forming the cavity with the lower mold and the upper mold, the foam particles are packed into the cavity in a state where the distance between the lower mold and the upper mold is 1 to 2 mm,
The method for producing a composite material for shoes according to any one of claims 1 to 4, wherein the cavity is evacuated in a state where the distance is reduced and the foamed particles are compressed.
In the step of packing the expanded particles in the cavity,
Mixing the gel particles and the foamed particles,
Put the mixed gel particles and the foamed particles into the cavity,
The number of gel particles is less than the number of foam particles,
The expanded particles are non-crosslinked TPU expanded particles;
The method for producing a composite material for shoes according to any one of claims 1 to 5, wherein the gel particles are polyurethane gel particles.
As the mold, a mold having a lower mold and an upper mold is used,
The fixing position for fixing the horizontal position of the shoe part in the cavity is arranged on the bottom surface of the cavity of the lower mold, and any one of the front end, the rear end, and the intermediate position of the cavity. The method for producing a composite material for shoes according to any one of claims 1 to 6, wherein the method is provided at one place or two or more places.
The expanded particles are formed of TPU,
The shoe part includes a rubber layer formed of rubber, and a surface layer laminated on the rubber layer and formed of rubber and TPU,
The surface layer and the foamed particle layer are combined,
The method for producing a composite material for shoes according to any one of claims 1 to 7, wherein a rubber concentration of the rubber layer is higher than a rubber concentration of the surface layer.
The shoe composite material according to any one of claims 1 to 8, wherein, in the step of packing the expanded particles in the cavity, a plurality of types of particles including the expanded particles are supplied into the cavity in a mixed state. Manufacturing method.
The step of stuffing foam particles into the cavity includes mixing the plurality of types of particles and supplying the plurality of types of particles mixed by the mixing into the cavity. A method for manufacturing a composite material for shoes.
A mold having an upper mold and a lower mold,
By overlapping the upper mold and the lower mold, a cavity is formed between the upper mold and the lower mold,
The bottom of the cavity has a fixed position for fixing the horizontal position of the shoe parts,
Foam formed by foaming the foamed particles by fixing the horizontal position of the shoe part at the fixed position and filling the cavity with foamed particles and then foaming the foamed particles. A mold in which the shoe part is bonded to one surface of a particle layer to produce a shoe composite material in which the foamed particle layer and the shoe part are integrated.
The upper mold includes a feeder for supplying foam particles, a steam path, a cooling water path, and a discharge path for discharging air to make the vacuum state, and the lower mold includes a steam path, The mold according to claim 11, further comprising a cooling water passage and a discharge passage for discharging air to make the vacuum state.
A composite material for shoes,
A foamed particle layer formed by stacking a plurality of foamed particles having a non-uniform particle diameter;
One or two or more shoe parts arranged at a front end, a rear end, or an intermediate position between the front end and the rear end of one surface of the foamed particle layer,
A composite material for shoes, wherein the foamed particles foam in a mold and the foamed particle layer adheres to the shoe parts.