JP4504698B2 - Method for manufacturing injection-molded shoes having ventilation holes and injection-molded shoes - Google Patents

Description

This invention relates to an injection molding shoe manufactured by the manufacturing method and manufacturing method thereof forming shoe out morphism.

  The method of manufacturing an injection-molded shoe is to suspend a stretchable backing cloth in a foot-shaped last mold, and then to last two side molds that form the outer surfaces on both sides of the last mold and a bottom mold that forms the bottom surface. The mold is made close to the mold with an appropriate interval, the space formed by the four molds is filled with a synthetic resin material, and the synthetic resin material is cooled and solidified, and then removed from the mold.

  Since the injection-molded shoes are integrally formed of synthetic resin, they generally have high sealing performance and poor air permeability. Therefore, there is a problem that the feet are stuffy when worn for one day at work around water. In order to solve the problem of poor air permeability, a conventional technique of making a hole in a conventional shoe is known.

  As a shoe for which a hole is formed in the upper part of a conventional shoe to obtain moisture removal performance, Patent Document 1 (Prior Art 1) states that “a large number of small ventilation holes formed near the toe part of the upper part of a rubber boot. There is a disclosure of `` rubber boots with a dehumidifying device in which a drainage port provided slightly below the front part of the cylindrical cuff is connected by a drainage passage formed on the outside of the rubber boots, and many others are known It was.

  Further, as a molding method for forming a vent hole in the bottom of a shoe and an injection molding shoe manufacturing apparatus used therefor, Japanese Patent Laid-Open No. 10-329237 [Patent Document 2 (Prior Art 2)] describes “Last Mold and The tape mold forming space is defined by the side mold and the bottom mold, and at the same time, the tips of a plurality of pins that are slidable up and down with respect to the bottom mold and are urged by a spring are brought into contact with the inner bottom of the last mold side. Then, the sole material is injected to mold the tape part, and then the bottom mold is lowered to define the sole part forming space, and at the same time the pin tip is kept in contact with the insole, The sole part is molded by injecting the material, and the pin portion is formed as a vent hole. "

  Further, Patent Document 2 states that “the vent hole forming mechanism 5 includes a pin hole 10 that vertically penetrates the bottom mold 4 as shown in FIG. 3, and a pin 11 that can slide up and down along the pin hole 10. And an adjustment member 12 screwed into the lower end side opening screw portion of the pin hole 10 and a spring 13 as an urging member interposed between the adjustment member 12 and the pin 11. There is also a description that the tip of the pin 11 protrudes upward from the upper surface of the bottom mold 4 with the urging force (see the column of Patent Document 2 [0018]).

Full text attached to the first application of Japanese Utility Model No. 49-022843 (Japanese Utility Model Application No. 50-112349) JP-A-10-329237

  In the prior art 1, there is no description as to the manufacturing method of the rubber boots by using the many ventilation small holes drilled near the toe portion of the back of the rubber. There is only a description that the boots are provided with a vent hole and a moisture exhaust port. Also in the injection-molded boots, as a means for providing a conventionally used ventilation hole, the ventilation hole is formed in the shoe by a drill, a punch or the like. In the case of injection-molded shoes, in particular, in order to improve the comfort in boots, before the synthetic resin is injected, a backing made of cloth or the like is suspended in a last mold to form a shoe in which the backing and the resin are integrated. Therefore, when trying to provide a ventilation hole with a drilling tool such as a drill or a punch, there is a problem in that even the backing material is opened and damaged. In addition, there was a risk that the toenails would get caught in the patch when the patch was applied to the damaged part.

  In prior art 2, since a vent hole is formed on the bottom of the shoe, the pins provided on the bottom mold are slidable up and down with respect to the bottom mold and are urged by a spring, and the tips of the plurality of pins are placed on the last mold side. After making it contact | abut to an inner bottom and inject | pouring a synthetic resin to the clearance gap between last molds and solidifying, it was performed by dropping a bottom mold with respect to a last mold. That is, since the vent hole of the prior art 2 is formed in the shoe sole, it has been performed by lowering the bottom mold in the direction of the vent hole.

  Therefore, in the side mold separated from the last mold in the width direction of the foot, when the vent hole communicating with the upper part of the shoe is opened, in the configuration in which the pin of the conventional technique 1 is urged by the spring to the last mold, When the side mold moves away from the width of the foot after the synthetic resin is solidified, the side mold pin moves in the direction of the side of the hole, not the direction of the hole in the hole. In addition, when a water-resistant film-like film is used as a backing, there is a problem that it cannot be used because it is damaged.

  Further, when the pin is applied to the backing cloth covered with the last mold with the urging force of the spring protruding as in the prior art 2, the pin and the backing cloth may be rubbed and thus may be damaged.

The method of manufacturing an injection-molded shoe according to claim 1, wherein a synthetic resin material is filled in a filling gap formed by assembling a last mold, two side molds, and a bottom mold, and the synthetic resin material is solidified. In the method of manufacturing an injection-molded shoe for simultaneously molding at least a back part and a shoe sole part of the injection-molded shoe, the side mold is movable in a lateral direction with respect to the last mold. At least a portion corresponding to the toe periphery of the upper part is provided with a plurality of pins that move by driving control of the pressure means. (I) Each mold is assembled, and the pins are moved from the surface of the side mold. Forming a filling void of a synthetic resin material by contacting with a suitable pressure on a backing material that is projected and covered with the last mold; and (ii) the filling The synthetic resin material was filled into the gap, and after the synthetic resin material was solidified, the pins were submerged from the surface of the side mold, and then the molds were separated from each other, thereby forming the solid synthetic resin material. Forming a plurality of air holes in the upper part of the injection molded shoe.

The method for manufacturing an injection-molded shoe according to claim 2 of the present invention is the method for manufacturing an injection-molded shoe according to claim 1, wherein the pressure means is configured to 1 × 10 the pin. ⁴ ~ 1x10 ⁶ It is made to contact | abut to the said backing material with the pressure of Pa.

The method for producing an injection-molded shoe according to claim 3 of the present invention is the method for producing an injection-molded shoe according to claim 1 or 2 , wherein at least the position where the vent hole is formed and the surrounding lining material are: it has a film-like film having a waterproof and breathable or breathable, Ru fabric backing material der for covering the last mold to contact the film to a synthetic resin material.

An injection-molded shoe according to claim 4 of the present invention is an injection-molded shoe manufactured by the method for manufacturing an injection-molded shoe according to any one of claims 1 to 3, wherein the porous hole is formed with a porous resin. it characterized by being filled with elastic material.

According to the manufacturing method of the elevation-molded shoe of the present invention, a plurality of pins provided on the portion corresponding to the instep portion of the side mold to be separated in the right-left direction with respect to the last mold and deaths from the surface of the side mold by the pressure means Therefore, the synthetic resin material is solidified, and it becomes possible to demold the injection-molded shoe formed without destroying the plurality of air holes formed by these pins.

Further, according to the method of manufacturing molded footwear out morphism of the invention, a plurality of pins pressure means provided in a portion corresponding to the instep portion of the side mold, protrude from the surface of the side mold to the last mold surface direction last mold The pin can be brought into contact with the backing material covered with an appropriate adjusted pressure, so that there is no possibility of damaging the backing material or the film film of the backing material by the pins.

  Furthermore, the injection-molded shoe produced by the method for producing an injection-molded shoe of the present invention can satisfactorily fill the formed vent with the porous resin elastic body, and is filled with the porous resin elastic body. This prevents rainwater and tap water from accumulating in the ventilation holes to ensure the moisture permeability and breathability of the shoes, and prevents the back fabric material from being damaged by preventing dirt and sand from entering. Ensure sex.

  FIG. 1 is an explanatory view of an apparatus for manufacturing an injection-molded shoe showing an embodiment of the present invention, FIG. 2 is an enlarged partial sectional explanatory view of a portion A in FIG. 1, and FIG. 3 is an enlarged explanatory view of a B portion in FIG. Description will be given by taking as an example a boot made of a trunk, an upper, and a shoe sole based on FIG. 4, which is a perspective view showing the upper of an injection molded shoe manufactured by an injection molded shoe manufacturing apparatus showing an embodiment of the invention. .

  First, an injection molded shoe manufacturing apparatus showing an embodiment of the present invention will be described. 1 is a last mold, 2 is a side mold, and 3 is a bottom mold. The two side molds 2 and 2 each have a concave surface corresponding to the left outer shape of the last mold 1 and the other corresponding to the right outer shape, and are provided so as to be able to approach and separate from the last mold 1 in the left-right direction. ing. The bottom mold 3 is provided so as to be movable up and down with respect to the bottom surface of the last mold 1 so that a shoe bottom portion can be formed on the bottom surface side of the last mold 1. In addition, it is not necessary to shape | mold the shoe sole part including the ground contact bottom, and a separately manufactured ground contact bottom can be bonded to the molded shoe sole part later.

  The last mold 1, the side molds 2, 2 and the bottom mold 3 are assembled to form a void that can be filled with a synthetic resin material. The synthetic resin material includes a two-component reaction type urethane resin material and a thermoplastic resin material such as a vinyl chloride resin material that melts when heated.

  Hereinafter, the present invention will be described with specific examples of thermoplastic resin materials that are melted by heating. A plurality of pins 4 are dispersedly provided on portions corresponding to the respective upper portions of the side molds 2 and 2 (particularly around the toes). After assembling each mold, each of the plurality of pins 4 protrudes from the surface of the side molds 2 and 2 toward the last mold 1 by pressure means 5 such as an air cylinder, and covers the last mold 1. By contacting the material 10, the gap 8 filled with the synthetic resin material is formed. Furthermore, each of the plurality of pins 4 is pushed back by a spring provided in the air cylinder and sunk from the surfaces of the side molds 2 and 2.

Each of the plurality of pins 4 is attached to the tip of the piston rod of the air cylinder 5 as shown in FIG. The air cylinder 5 is fixed to the side mold 2 via an attachment jig. The air is supplied to the air cylinder 5 by the air hose 6 so that these pins 4 protrude from the surface of the side mold 2 and come into contact with the last mold 1. The shape of each pin 4 may be cylindrical or polygonal. The number of the pins 4 is about 4 to 15, and the area of the tip of the pin 4 is about 1 to 10 mm ² corresponding to the diameter of the vent hole 7 formed in the upper part. If the pin 4 is made narrower in order to make the hole diameter of the vent hole 7 smaller than this, not only the backing material 10 may be damaged but also the moisture permeability effect is small even though the bent hole 7 is provided. Further, if the pin 4 is made thicker in order to increase the diameter of the vent hole 7 than this, resistance due to the solidified resin material becomes large and the pin 4 is not easily returned, and rainwater and tap water easily enter the vent hole 7. May impair the moisture permeability effect.

Each pin 4 is moved by applying air pressure through an air hose 6 by an air cylinder 5 as pressure means. The pressure in contact with the backing material 10 placed on the last mold 1 is 1 × 10 ⁴ to 1 × 10 ⁶ Pa. In the last mold 1, an elastic body (not shown) is fitted at a position where the pin 4 abuts and at the periphery thereof. The elastic body is for preventing damage to the backing material more reliably, and it is effective to use a type A hardness of 40 to 70 degrees and a thickness of 1 to 15 mm.

  Next, the manufacturing method of the injection molded shoes of this invention is demonstrated. In the present invention, a synthetic resin material is filled in a gap 8 formed by the last mold 1, the two side molds 2, 2 and the bottom mold 3, and the synthetic resin material is cooled and solidified, and then demolded. The present invention relates to a method for manufacturing an injection-molded shoe. When the shoe is completed by covering the last mold 1 with the backing material 10 in advance, the backing material is integrated with the resin.

  Although the cloth 10 may be used alone as the backing cloth material 10, at least a part corresponding to the periphery of the toe of the upper part (the part with which the pin 4 abuts and its part) in order to impart water resistance and moisture permeability to the vent hole 7. The peripheral portion) has a structure in which a water-resistant film is laminated on a fabric or a laminate of a fabric and a cushion material, and the fabric side is covered with the last mold with the fabric side facing the last mold side. The presence of the fabric or the laminate of the fabric and the cushion material disperses the impact when the pins 4 come into contact with the backing fabric material 10, and effectively prevents film damage. Further, the backing material 10 can be treated with a fluorine-based water repellent or a silicone-based water repellent to impart water repellency.

  As the fabric used for the backing fabric material 10, synthetic fibers such as polyester fibers and polyamide fibers, semi-synthetic fibers such as acetate fibers, and natural fibers such as cotton, hemp and wool can be used alone or in two. It can be used as a woven fabric, a knitted fabric, a non-woven fabric or the like by mixing two or more species. Polyurethane foam can be used as the cushion material.

Further, the film-like film used in the back fabric material 10, water pressure resistance (JIS-L1092A method), in 300mmH ₂ O or more, and a material having a moisture permeability. For example, (1) a microporous film mainly composed of polyurethane, (2) a microporous film mainly composed of polytetrafluoroethylene, and (3) a nonporous film mainly composed of urethane having moisture permeability. (4) A non-porous film mainly composed of polybutylene terephthalate having moisture permeability is used. As a specific example of the backing fabric material 10 having a film-like film, a polyurethane solution obtained by dissolving a polyurethane resin in a water-soluble solvent is directly or indirectly coated on a fabric, and this is wet-gelled in water. In addition, a laminate obtained by replacing the solvent with water to form a film-like film (polyurethane microporous film) on the fabric may be mentioned.

  The side molds 2 and 2 are provided with a plurality of pins 4 dispersed in a part corresponding to the upper part (particularly around the toe). The toe periphery means a position corresponding to the upper part and / or the side part of the toe of the foot. These pins 4 are protruded from the surfaces of the side molds 2 and 2 toward the last mold 1 by pressure means 5 such as an air cylinder, and contact the backing cloth material 10 covering the last mold 1 with an appropriate pressure. Is possible. Furthermore, these pins 4 are pushed back by a spring provided in the air cylinder and can be immersed from the surfaces of the side molds 2 and 2.

  The manufacturing process according to the embodiment of the present invention will be described below. The left and right side molds 2 and 2 and the bottom mold 3 are moved toward the last mold 1 to mold each mold. At the time of this approaching movement, each pin 4 is in a state of being submerged from the surface of the side molds 2 and 2 by a spring in the air cylinder.

After assembling each mold, air pressure is applied to each pin 4 by an air cylinder as a pressure means, and the pins 4 that have been submerged from the surfaces of the side molds 2 and 2 are projected in the direction of the last mold 1 to be the last mold. A gap 8 filled with a synthetic resin material is formed by abutting against the lining material 10 placed on the substrate 1. At this time, the pressure at which each pin 4 abuts against the backing material 10 is 1 × 10 ⁴ to 1 × 10 ⁶ Pa. If the pressure is lower than this, there is a possibility that the melted synthetic resin material enters between the tip of the pin 4 and the backing material 10 and the vent hole 7 formed in the upper part is blocked. Further, if the pressure is higher than the above, the backing material 10 may be damaged. Further, since the cloth used for the backing cloth material 10 includes a gap inside, there is a buffering effect when the tip of the pin 4 comes into contact with the backing cloth material 10, and the film prevents damage to the film. There is.

  Next, the molds are assembled, and the synthetic resin material is poured into the gaps 8 formed by bringing the respective pins 4 into contact with the backing cloth material 10 coated with the last mold 1 and filling them. Then, after the synthetic resin material is cooled and solidified, the air pressure applied to the air cylinder 5 that is the pressure means is made zero, so that each pin 4 is attached to the side mold 2, 2 surface by the spring in the air cylinder 5. Make it sink more. Due to the retreating movement of the pin 4, a vent hole 7 is formed at the place where the pin 4 was located.

  In this way, an injection-molded shoe having a plurality of vent holes 7 is formed on the back of the solidified resin material that is integral with the backing material, and then the molded shoe is demolded.

Next, an injection molded shoe S manufactured by using the injection molded shoe manufacturing apparatus of the present invention will be described. An injection-molded shoe S according to an embodiment of the present invention is provided with a plurality of pins 4 at portions corresponding to the upper portions of side molds 2 and 2 that move toward and away from the last mold 1 in the left-right direction. pin 4 is the pressure means by the air cylinder 5 or the like, the side mold backing fabric material 10 to 1 × 10 4 ^{to 1} × 10 which projects into the last mold in one direction from the surface in advance coating the last mold 1 2,2 This is an injection-molded shoe S manufactured by using an injection-molded shoe manufacturing apparatus that can be brought into contact with a pressure of about ⁶ Pa and can be submerged from the surfaces of the side molds 2 and 2.

The injection molding shoe S is one embodiment of the invention, the pressure means of the air cylinder 5 or the like after assembled mold each mold, 1 × 10 ⁴ ~ to backing fabric material 10 that is precoated with last mold 1 The synthetic resin material is filled in the gap 8 formed by contacting with a pressure of about 1 × 10 ⁶ Pa. In this state, the synthetic resin material is cooled and solidified, and then these pins 4 are connected to the side molds 2 and 2. The vent hole 7 is formed in the resin material solidified by immersing it from the surface, and the back cloth material 10 forms an injection-molded shoe that covers the vent hole 7 and is integrated with the resin, and is then formed. The vent hole 7 is filled with a porous resin elastic body 9. The total area of the vent hole 7 may be any 10 to 50 mm ^2, the number of vent holes 7 may be a 4 to 15 or so. The porous resin elastic body 9 is preferably formed of a material having hydrophobic (water repellency) properties, or a surface coated with a water repellent.

The air permeability of the porous resin elastic body 9 (according to JIS-K6400 method A) is preferably lower than about 20 ml / cm ² · s. If the air permeability is higher than this, water tends to enter the air holes. . As such a porous resin elastic body 9, urethane resin, ethylene resin, and EVA resin can be used.

In this injection-molded shoe S, since the backing cloth material 10 is firmly and integrally bonded to the edge portion 70 of the solidified resin material around the vent hole 7, the porous resin elastic body 9 is inserted into the vent hole 7. At this time, since the backing cloth material 10 acts as an insertion stopper, the porous resin elastic body 9 is surely packed in the vent hole 7. Since the hole diameter of the vent hole 7 is about 1 to 10 mm 2 corresponding to the diameter of the pin 4, the porous resin elastic body 9 is reliably held in the vent hole 7. If the hole diameter of the vent hole 7 is too large, it is difficult to hold the inserted porous resin elastic body 9, and when the injection-molded shoes are actually worn, the backing material 10 at the position of the vent hole 7 is likely to be damaged. is there.

  Further, instead of providing the porous resin elastic body 9 by insertion, the synthetic resin dispersion is mixed to form a large number of fine air particles and solidified into the respective air holes 7 before solidifying. It is possible to form the porous resin elastic body 9 by solidifying with the above. Also in this case, the backing cloth material 10 works as a stopper, which is convenient.

  A comparison between an injection-molded shoe having a vent hole in the vicinity of the toe of the upper part (the upper part and the side part of the toe) and an injection-molded shoe having no vent hole by the manufacturing method of the injection-molded shoe of the present invention was performed by a wearing test. A humidity sensor was attached to the back side toe part of a breathable insole, and the humidity was measured over time. Room temperature 16 ° C.

Incidentally, vent 8 formed was dispersed in toe periphery having a diameter of 2 mm, the pin abutment portion and its periphery of the backing cloth material moisture permeability 3000g ^/ cm 2 · 24h, water resistance 2000mmH ₂ O A film-like film was used.

  Injection-molded shoes, especially shoes that are worn around the water, manufacturing shoes with a porous resin elastic body that improves moisture permeability inside the boots, especially around the toes of the upper part, makes the feet less stuffy, and has water repellency in the vents Is possible. Therefore, the applicability is high in the production of injection molded shoes such as boots.

Explanatory drawing of the manufacturing apparatus of the injection molded shoes which shows embodiment of this invention Part A enlarged partial sectional explanatory view of FIG. Part B enlarged explanatory view of FIG. The perspective view which shows the upper part of the injection-molded shoes which are one Example of this invention

Explanation of symbols

S Injection molded shoes 1 Last mold
10 Lining material 2 Side mold
3 Bottom mold
4 pin
5 Air cylinder (pressure means)
6 Air hose 7 Vent hole 70 Edge portion of solidified resin material around the vent hole 8 Void 9 Porous resin elastic body

Claims (4)

And the last mold, and two side molds, filling the synthetic resin material filling voids formed by assembled mold and bottom mold, and the upper portion and the sole portion of the at least injection molding shoe solidifying the synthetic resin material In the manufacturing method of injection-molded shoes for simultaneously molding ,
The side mold is movable toward and away from the last mold in the left-right direction ,
Wherein at least a portion corresponding to the toe periphery of definitive to side molds the upper part, is provided with a plurality of pins to be moved by the drive control of the pressure means,
Each said mold to Katakumi, the steps of the pin to form a filling gap of the side mold surface than is protruded by contact with an appropriate pressure to the back cloth that covered the last molding synthetic resin material,
Filled with a synthetic resin material into the filling gap, the pin after the synthetic resin material is solidified by submerged than the side mold surface, followed by Rukoto to separate the respective said mold, solidified synthetic resin material forming a plurality of vent holes in the upper portion of the shaped injection-molded shoes,
A method for manufacturing an injection-molded shoe, comprising: The pressure means pushes the pin 1 × 10 ⁴ ~ 1x10 ⁶ The method for manufacturing an injection-molded shoe according to claim 1, wherein the backing material is brought into contact with Pa at a pressure of Pa. At least the position where the air holes are formed and the surrounding lining material have a film-like film having water resistance, moisture permeability or air permeability, and the last mold so that the film comes into contact with the synthetic resin material. The method for manufacturing an injection-molded shoe according to claim 1 or 2, wherein the material is a lining material to be covered. An injection-molded shoe manufactured by the method of manufacturing an injection-molded shoe according to any one of claims 1 to 3 , wherein the formed vent hole is filled with a porous resin elastic body. Molded shoes.

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