JP4778278B2 - An injection-molded shoe having a step-out prevention plate and a manufacturing method thereof. - Google Patents

Description

  The present invention relates to an injection-molded shoe equipped with a step-out prevention plate.

Conventionally, safety shoes with a step-out prevention plate are used in construction sites and disaster areas such as earthquakes. Safety shoes protect feet from nails, glass, etc. by fixing or embedding them in the sole of the shoe sole, such as a stainless steel board, cardboard board, or plastic board. .
Japanese Utility Model Publication No.42-11253 Japanese Utility Model Publication No. 37-20753

  By the way, such a safety shoe can be manufactured by separately making a sole with a stepping prevention plate attached thereto and joining it to the upper shell. A process of joining the leather and the shoe sole is necessary, and the manufacturing cost tends to be high.

  In order to reduce the manufacturing cost, an injection molding method (direct sorting method) that does not require a separate step of joining the upper and the sole is considered to be effective. However, since it is difficult to obtain a sufficient bonding force between the shoe sole formed of a synthetic resin material and the step-out prevention plate, if the step-out prevention plate is disposed on the upper surface portion of the shoe sole, the step-out prevention plate falls into the shoe. There is a problem. As a countermeasure, the stepping prevention plate is floated and fixed in the shoe sole formation space with an insert holding member, etc., filled with synthetic resin material by injection, and the stepping prevention plate is embedded in the shoe sole. However, there is a problem that the flow of the synthetic resin material is disturbed by the presence of the step-out prevention plate itself, and a defective portion is generated due to unfilling of the synthetic resin material. There is also a problem that the step-out prevention plate moves due to the pressure caused by the flow of the synthetic resin material.

  The present invention has been made in view of these problems, and is a shoe manufactured by injection molding, and has a step-out prevention plate in spite of having a step-out prevention plate in the upper part of the shoe sole. An object of the present invention is to provide an injection-molded shoe in which is firmly fixed, and a method for manufacturing the same.

An injection-molded shoe having a step-out preventing plate according to the present invention is a portion including a shoe sole by solidification of a synthetic resin material after a fluid synthetic resin material is filled in a gap formed by combining a plurality of molds. In injection molded shoes where
A step-out prevention plate is disposed between the shoe sole and the inner material having a communication structure,
A permeation-solidified portion integrated with the shoe sole is formed around the step-out prevention plate, and the permeation-solidified portion is a portion where the synthetic resin material has permeated and solidified the inner material.

  Further, the injection molded shoe having the step-out prevention plate of the present invention is preferably configured such that the protrusion solidified portion that rises from the permeation solidification portion and protrudes into the shoe and goes around the upper surface side of the step-out prevention plate It is the structure currently formed along the periphery.

In the method of manufacturing an injection molded shoe having a step-out prevention plate according to the present invention, the step-out prevention plate is made of a metal material,
A hot melt adhesive is arranged on at least the upper surface of the step-out prevention plate,
Arrange the inner material so as to cover the surface corresponding to the sole of the foot mold, and on the lower surface of the inner material, arrange the step-out prevention plate with hot melt adhesive,
A heated synthetic resin material is filled in a gap formed between the inner material provided with the step-out prevention plate and the other mold surrounding the inner material.

In the method for manufacturing an injection molded shoe having a step-out prevention plate according to the present invention, the foot mold is provided with a recess corresponding to the position where the step-out prevention plate is disposed, and the recess is a step-out prevention plate. It is a recess that is partially blocked,
While arranging the inner material so as to cover the surface corresponding to the sole of the foot mold, a stepping prevention plate is arranged on the lower surface of the inner material,
A synthetic resin material is filled in a gap formed between an inner material provided with a step-out prevention plate and another mold surrounding the inner material.

  In the injection-molded shoe having a step-out prevention plate of the present invention, the inner material immediately above the step-out prevention plate is a permeation solidified portion at a portion located around the step-out prevention plate, On the other hand, since it acts like a lid, the step-out prevention plate is firmly fixed to the shoe. And since the inner material immediately above the stepping prevention plate is a portion where the synthetic resin material has not penetrated and solidified in the portion located on the stepping prevention plate, the gap formed by the communication structure causes the ground It has the effect of reducing the amount of cold and hot air transmitted from the feet.

  Further, in the injection molded shoe having the stepping prevention plate of the present invention, the protruding solidification part acts like a fastener with respect to the stepping prevention plate, so that the stepping prevention plate is more firmly fixed to the shoe. Has an effect.

  In the method of manufacturing an injection molded shoe having a stepping prevention plate according to the present invention, the hot melt adhesive is disposed on at least the upper surface of the stepping prevention plate made of a metal material. The heat is transmitted to the adhesive through the prevention plate, and the adhesive exhibits adhesiveness by the heat to join the step-out prevention plate and the inner material. At this time, since the stepping prevention plate is made of a metal material, there is an effect that heat is easily transmitted to the adhesive disposed on the upper surface of the stepping prevention plate. Further, the inner material is joined to the stepping prevention plate, so that the action of the inner material on the stepping prevention plate is enhanced.

  Further, in the method of manufacturing an injection molded shoe having a step-out prevention plate according to the present invention, since the concave part that is partially blocked by the step-out prevention plate is provided in the foot mold, the protruding and solidified portion is formed well. be able to.

  Hereinafter, an injection-molded shoe having a step-out prevention plate according to the present invention will be described with reference to the drawings. An injection-molded shoe according to an embodiment of the present invention is shown in FIGS. FIG. 1 is a cross-sectional view in the foot length direction of the boot 10, FIG. 3 is the boot 11, and FIG. 5 is the boot 12.

  (Embodiment 1) A boot 10 will be described with reference to FIGS. As the step-out prevention plate 1, a synthetic resin plate, an aluminum plate, a steel plate, a stainless plate, or the like that is harder than the sole is used. The step-out prevention plate 1 is sandwiched between the shoe sole and the inner material, and has a size and shape that fits in the bottom surface 50 of the shoe. It is arranged so as to protrude. Further, the step-out prevention plate 1 is joined to the inner material via an adhesive, but a hot melt adhesive is used to join the two using the heat of the heated synthetic resin material. In this case, a metal-based material having a thermal conductivity of 10 (W / m · K) or more is preferable in that it is efficient in manufacturing, and heat is efficiently transferred to the adhesive at this time. Used for. Specifically, a stainless plate of 0.3 to 0.5 mm is preferably used. The step-out prevention plate 1 is preferably sized and shaped to protect the entire sole.

The inner material 2 faces the sole side and is provided so as to cover at least the bottom surface 50 in the shoe, and has a communicating structure so that a fluid synthetic resin material can penetrate or permeate. The material constituting the inner material 2 is a single layer material of a fabric such as a woven fabric, a knitted fabric or a non-woven fabric, a laminated material such as a fabric / cloth, a polyurethane foam / fabric of a fabric / communication structure, or a web / fabric such as a fabric / cotton. A material that is used and preferably has a fabric disposed in the lower layer. The fabric has a pore volume ratio of 40 to 97% (JISL-1096), a thickness of 0.3 mm or more, and a mass per unit area of 60 to 300 g / m ² , and the fluidized synthetic resin material can easily penetrate or permeate. Also, it is preferably used for the reason of preventing cold air and hot air from the ground. As the cloth, a three-dimensional net cloth or the like in which the ground structures of the front and back surfaces represented by a raised cloth and a double raschel cloth are connected with a connecting thread is also preferably used. In the boots 10, the inner material 2 is made of a single layer material of cloth and is shaped like a sock by sewing or the like.

  The shoe sole 3 is formed by solidifying after a fluid synthetic resin material is injected into a mold. In the boots 10, the upper 4 is formed at the same time as the formation of the sole 3 and is integrated with the sole 3.

  Synthetic resin materials include vinyl chloride resins, ethylene resins, synthetic rubbers (SBR and NBR), two-component reactive polyurethanes, and other additives, as necessary by adding extenders, softeners, curing agents, and stabilizers. Used. Further, these synthetic resin materials are preferably those using a thermoplastic resin that is heated and has fluidity, and among them, a vinyl chloride resin material prepared by adding a plasticizer and having an appropriate hardness is preferable.

  The portion denoted by reference numeral 2b is a permeation solidified portion formed by the synthetic resin material permeating into the inner material 2. The permeation solidified portion 2 b is a portion formed integrally with the shoe sole 3 by allowing the synthetic resin material to permeate the inner material 2 positioned around the step-out prevention plate 1 at least in the range of the shoe inner bottom surface 50. The permeation solidification portion 2 b is formed on and around the stepping prevention plate 1 and is in contact with the stepping prevention plate 1. At this time, if the edge of the permeation solidified portion 2b overlaps with the step-out prevention plate 1 to form an overlap, the step-out prevention plate 1 is more firmly fixed to the shoe. The permeation-solidified part 2b does not need to be formed over the entire thickness direction of the inner material, but the thickness of the permeation-solidified part is preferably 0.3 mm or more.

  The portion denoted by reference numeral 2a is a portion where the synthetic resin material has not penetrated into the inner material 2 and has not solidified, or a portion where the properties of the inner material have been substantially maintained even if the synthetic resin material has penetrated and solidified to some extent. Therefore, this portion of the inner material has, for example, a fine gap between fibers or yarns when the inner material is made of fabric, so that the air from the ground to the feet of cold air and hot air This is the part that reduces the amount of transmission.

(Embodiment 2) The boots 11 will be described with reference to FIGS. The boots 11 are the same as the boots 10 except that the boots 11 have the protruding solidified portion 5. The protruding solidified portion 5 is formed by solidifying a synthetic resin material that has penetrated the inner material and protruded into the shoe. The projecting and solidifying portion 5 is a portion projecting from the upper surface of the permeation solidifying portion 2b toward the inside of the shoe, is formed along the periphery of the stepping prevention plate 1 and wraps around the upper surface side of the stepping prevention plate. Yes. As shown in FIG. 6, it is preferable that the projecting and solidifying portion 5 is composed of a plurality of pieces arranged along the peripheral edge of the stepping prevention plate 1. As shown in FIG. 7, it may be configured so as to go deeply into the upper surface side of the step-out prevention plate 5 and cover the upper surface side like a net in plan view. If the projecting and solidifying portion 5 is configured to cover the upper surface side of the stepping prevention plate 1 in a net shape, the stepping prevention plate is more firmly fixed to the shoe, and a new gap is formed by the net-like projecting and solidifying portion. As a result, it is possible to prevent cold air and hot air from the ground.
It is preferable that the height from the upper surface of the inner material of the protruding solidified portion 5 is 3 to 10 mm.

  (Embodiment 3) The boots 11 will be described with reference to FIG. Also in the boots 11, the stepping prevention plate 1 and the material of the inner material are the same as the boots 10 and the boots 11. Further, the protruding solidified portion 5 is formed in the same manner as that of the boots 11. The main difference between the boots 12 and the boots 11 is that the inner material 40 has a size and shape that substantially matches the inner bottom surface 50 of the shoe, and the upper 41 is formed of a different material from the shoe sole 3. Is a point. In the short boots 12, the bottom edge of the upper 41 and the peripheral edge of the inner material 40 are sewn into a sock-like shape.

  Next, a method for manufacturing an injection-molded shoe having a step-out prevention plate according to the present invention will be described.

(Manufacturing Method of Embodiment 1) A manufacturing method of the boots 10 will be described with reference to FIG.
First, the inner mold 2 having a shape like a sock is put on the foot mold 21 by sewing the fabric. Then, a step-out prevention plate 1 having a size and shape capable of protecting the entire sole is disposed by temporary fixing with a double-sided tape or the like at a portion corresponding to the sole of the inner material 2. If the step-out prevention plate 1 is made of metal, the temporary fixing can be performed by using a magnetic force in a foot mold. The step-out prevention plate 1 may be provided with unevenness so as to match the uneven shape of the sole of the foot mold.

  A hot-melt adhesive (not shown) is disposed on at least the upper surface of the step-out prevention plate 1. The reason for using hot-melt adhesive is that it is easy to handle because it does not have adhesiveness at room temperature, it exhibits adhesiveness with the heat of the synthetic resin material, is pressure-bonded with the pressure when filling the synthetic resin material, and the shoe is removed from the mold This is because the adhesive force has already been developed. As a method of arranging the hot melt adhesive on the top surface of the stepping prevention plate 1, there is a method of using a hot melt film and sticking it to the stepping prevention plate 1 by heat fusion or the like. A method of applying the dispersion type hot melt adhesive to the step-out prevention plate 1 is simple.

  At this time, it is preferable that a hot-melt adhesive is also disposed on the lower surface of the stepping prevention plate 1 so that the bonding force between the stepping prevention plate 1 and the shoe sole 3 is increased.

  Then, the gap mold 25 is formed by combining the foot mold 21, the side mold 22, and the bottom mold 23. A synthetic resin material that is heated and fluidized using an injection molding machine (not shown) is injected from the injection port 24 on the bottom surface of the bottom mold 23 into the gap of the molding apparatus 20 in which the inner 2 and the step-out prevention plate 1 are mounted. Press to 25 and fill completely.

At this time, since the synthetic resin material permeates the portion of the inner material 2 located around the step-out prevention plate 1, the permeation solidified portion 2 b is formed integrally with the shoe sole 3. However, the portion of the inner material 2 positioned on the step-out prevention plate 1 is blocked by the step-out prevention plate 1 and the synthetic resin material does not permeate so much, so that a permeation solidified portion is not formed. Further, when the synthetic resin material is filled, the heat of the synthetic resin material is transmitted to the hot melt adhesive through the stepping prevention plate 1, and the inner material 2 is joined to the stepping prevention plate 1 through this adhesive. . By injecting the synthetic resin material from the injection port 24 on the bottom surface of the bottom mold 23, the pressure applied to the stepping prevention plate 1 due to the flow of the synthetic resin material is directed to the foot mold. Misalignment is unlikely to occur due to being pressed against the mold.
Then, after the synthetic resin material is solidified, the boots 10 are obtained by taking out the molded product from the molding apparatus 20.

(Manufacturing Method of Embodiment 2) A manufacturing method of the boots 11 will be described with reference to FIG.
The manufacturing method of the boots 11 is basically the same as the manufacturing method of the boots 10 except that the molding apparatus is different. However, it is preferable that the step-out prevention plate 1 and the inner member 2 are joined by the hot melt adhesive method, but the present invention is not limited to this, and the recess 29 of the foot mold 27 is filled with the synthetic resin material. This is different from the method for manufacturing the boots 10 in that the protruding solidified portion 5 is formed by being filled with the synthetic resin material. Specifically, the synthetic resin material heated and pressed into the gap 28 of the molding apparatus 26 equipped with the inner material 2 and the step-out prevention plate 1 is completely filled by pressurizing the synthetic resin material. The inner material 2 is permeated and permeated to fill the concave portion 29, and the protruding solidified portion 5 that protrudes from the penetrating solidified portion 2b into the shoe is formed.

  The molding apparatus 26 differs from the molding apparatus 20 only in that a recess 29 corresponding to the position where the step-out prevention plate 1 is disposed is provided on the bottom surface of the foot mold 27. The recess 29 is preferably formed by a plurality of recesses arranged along the periphery of the stepping prevention plate, but may be formed by a continuous annular groove along the periphery of the stepping prevention plate. These recesses 29 are partially blocked by the step-out prevention plate 1 as shown in FIG. Moreover, you may comprise the recessed part 29 by the groove | channel which spread in the planar view net shape.

(Manufacturing method of the third embodiment) The manufacturing method of the boots 12 is not greatly different from the manufacturing method of the boots 10 and therefore will be briefly described with reference to FIG.
First, the upper 41 and the inner material 40 are sewn into a sock-like shape. This is put on the foot mold 31. Then, the step-out prevention plate 1 coated with hot-melt adhesive on both sides is temporarily fixed to a portion corresponding to the sole of the inner material 2 with a double-sided tape or the like.

  Then, the gap 34 is formed by combining the foot mold 31, the side mold 32, and the bottom mold 33. A synthetic resin material that is heated and fluidized using an injection molding machine (not shown) is injected from the injection port 24 on the bottom surface of the bottom mold 33 into the gap of the molding apparatus 30 in which the inner material and the step-out prevention plate 1 are mounted. 34 is pressurized and completely filled, and the synthetic resin material is infiltrated and permeated into the inner material 2 to fill the recess 29, thereby forming the projecting and solidifying portion 5 integral with the shoe sole portion 3 and the permeation solidifying portion 2b. Then, after the synthetic resin material is solidified, the boots 12 are obtained by taking out the molded product from the molding apparatus 30.

(Example 1) First, the boots 10 will be described as an example. In Example 1, a 0.4 mm-thick stainless steel plate having a size and shape that can protect the entire sole is used as the step-out prevention plate 1 using the molding device 20, and the inner material 2 is 0.7 mm thick. 200 g / m ² , and a knitted fabric with a pore volume ratio of 72% was used.
First, the inner material 2 is placed on the foot mold 21 and a double-sided tape is attached to the vicinity of the middle of the step-out prevention plate 1 coated with a water-dispersed hot melt adhesive of 40 g / m ² on both sides. The step-out prevention plate 1 was temporarily fixed to a portion corresponding to the sole of the inner material 2 via a tape.

  Then, the foot mold 21 is combined with the side mold 22 and the bottom mold 23 to form a gap 25, and a synthetic resin material mainly composed of polyvinyl chloride (degree of polymerization 1300) and dioctyl phthalate is heated to 190 ° C. The air gap 25 was filled from the injection port 24 with fluidity. Then, the synthetic resin material was solidified by natural cooling, and the boots 10 of the Example were obtained.

  This boot 10 is formed with a permeation-solidified portion 2b having a thickness of 0.7 mm located on the upper side of the step-out prevention plate 1 and in contact with the step-out prevention plate. Moreover, the part of the code | symbol 2a shown in FIG. 2 is joined to the step-out prevention board 1 via the hot-melt-type adhesive agent.

(Embodiment 2) Next, boots 11 will be described as an example. In the second embodiment, the mold device 26 in which the foot mold 27 is provided with the recess 29 corresponding to the position where the step-out prevention plate is disposed, and the step-out prevention plate 1 and the inner material 2 are the same as those in the first embodiment. Was used. The recess 29 is partially blocked by a stepping prevention plate and is connected between 20 depressions lined up along the periphery of the stepping prevention plate and 18 depressions thereof. It is composed of a net-like groove in plan view.
First, the inner material 2 is placed on the foot mold 27, and a double-sided tape is attached to the vicinity of the middle of the step-out prevention plate 1 coated with a water-dispersible hot-melt adhesive on both sides. The extraction preventing plate 1 was temporarily fixed to a portion corresponding to the sole of the inner material 2.

  Then, the foot mold 27 is combined with the side mold 22 and the bottom mold 23 to form a gap 28, and a synthetic resin material mainly composed of polyvinyl chloride (degree of polymerization 1300) and dioctyl phthalate is heated to 190 ° C. The voids 28 were filled from the injection port 24 with fluidity. Then, the synthetic resin material was solidified by natural cooling, and the boots 11 of the Example were obtained.

  This boot 11 is formed with a permeation solidified portion 2b having a thickness of 0.7 mm that is located along and along the periphery of the stepping prevention plate 1 and in contact with the stepping prevention plate 1. Further, a protruding solidified portion 5 that protrudes from the penetration solidified portion into the shoe is formed so as to cover the upper side of the step-out prevention plate in a net shape as shown in FIG. Moreover, the part of the code | symbol 2a shown in FIG. 4 is joined to the step-out prevention board 1 via the hot-melt-type adhesive agent. The height from the upper surface of the inner material of the protruding solidified portion 5 is 5 mm.

  A person with a weight of 60 kg used the boots 11 and 12 of this example and conducted a nail treading test by walking 100 times. However, the step-out prevention plate 1 made of a stainless steel plate is firmly fixed to the shoe and into the shoe. It did not drop out.

Sectional drawing of the foot length direction in case the injection-molded shoes which have a step-out prevention board are the boots 10. FIG. The collar part expanded sectional view of FIG. Sectional drawing of the foot length direction when the injection-molded shoes which have a step-out prevention board are the boots 11. FIG. The collar part expanded sectional view of FIG. Sectional drawing of the foot length direction in case the injection-molded shoes which have a step-out prevention board are the short boots 12. FIG. Explanatory drawing of the planar view positional relationship of a step-out prevention board, a protrusion solidification part, and a shoe inner bottom face. Explanatory drawing of the planar view positional relationship of a step-out prevention board, a protrusion solidification part, and a shoe inner bottom face. Sectional drawing of the foot width direction of the mold apparatus for boots 10. FIG. Sectional drawing of the width direction of the mold apparatus for boots 11. FIG. Sectional drawing of the width direction of the mold apparatus for the boots 12. FIG. Explanatory drawing of the positional relationship of a step-out prevention board and the recessed part provided in the foot mold.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Step-out prevention board 2 Inner material 2b Penetration solidification part 3 Shoe bottom 4 Upper 5 Projection solidification part 10 Injection-molded shoes which have a step-out prevention board (boots)
11 Injection molded shoes (boots) with step-out prevention plates
20 Mold device 21 Foot mold 23 Bottom mold 25 Cavity 26 Mold device 27 Foot mold 28 Cavity 29 Recess 30 Mold device 31 Foot mold 34 Cavity 40 Inner material 41 Upper 50 Shoe bottom

Claims (4)

In injection-molded shoes in which a part including a shoe sole is formed by solidification of a synthetic resin material after a fluid synthetic resin material is filled in a gap formed by combining a plurality of molds,
A step-out prevention plate is disposed between the shoe sole and the inner material having a communication structure,
An injection-molded shoe, wherein a permeation-solidified portion integral with a shoe sole is formed around a step-out prevention plate, and the permeation-solidified portion is a portion in which a synthetic resin material has permeated and solidified the inner material.   The protrusion solidification part which stood | started up from the osmosis | solidification solidification part, protruded in shoes, and went around to the upper surface side of a step-out prevention board is formed along the periphery of a step-out prevention board. Injection molded shoes. A method for producing an injection-molded shoe according to claim 1 or 2,
The step-out prevention plate is made of metal material,
A hot melt adhesive is arranged on at least the upper surface of the step-out prevention plate,
While arranging the inner material so as to cover the surface corresponding to the sole of the foot mold, the step-out prevention plate is arranged on the lower surface of the inner material,
A method for manufacturing an injection-molded shoe, wherein a heated synthetic resin material is filled in a gap formed between an inner material provided with a step-out prevention plate and another mold surrounding the inner material. A method for producing an injection-molded shoe according to claim 2,
The foot mold is provided with a recess corresponding to the arrangement position of the step-out prevention plate, and the recess is a portion that is partially blocked by the step-out prevention plate,
While arranging the inner material so as to cover the surface corresponding to the sole of the foot mold, a stepping prevention plate is arranged on the lower surface of the inner material,
A method for manufacturing an injection-molded shoe, wherein a synthetic resin material is filled in a gap formed between an inner material provided with a step-out prevention plate and other molds surrounding the inner material.

Images