JPH0357401A - Bottom mold for forming injection molding shoes and manufacture of injection molding shoes using its bottom mold - Google Patents

Abstract

PURPOSE:To form the sole which is comfortable to wear and has a satisfactory external appearance by providing projectingly a peeling preventive pin for preventing the sole from peeling off from a bottom mold at the time of separating a dummy last from the bottom mold, on a side wall of a projecting body. CONSTITUTION:On the upper face 12 of a bottom mold 10, plural projecting bodies 14 are formed, and on a part of the projecting bodies 14, a peeling preventive pin 16 is provided vertically so as to be inclined toward the direction for taking out an injection molding shoe on its side wall 140, and on a heel part of the bottom mold 10, a forming material injection port 18 for the sole is provided. In this state, a forming material is injected from the forming material injection port 18 to a sole forming cavity being a fitting clearance of the bottom mold 10 and a dummy last 20, and thereafter, a show bottom 30 is manufactured by separating the dummy last 20 from the bottom mold 10. After the injection molding of the sole 30, when the dummy last 20 is separated from the bottom mold 10, the sole 30 is caught by the peeling preventive pin 16 since the peeling preventive pin 16 is in a state pierced into the shoe bottom 30, and it can be prevented that the sole 30 peels off from the bottom mold 10.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a bottom mold for injection molded shoes and a method for manufacturing injection molded shoes using the same. More specifically, the present invention relates to a bottom mold for injection molded shoes that prevents the sole from lifting up after the first side is injection molded, and a method for manufacturing injection molded shoes using the same. The present invention is suitable for producing shoes with soles made of different parts in terms of color or material, or boots with different soles and upper parts.

[Prior art]

For example, injection-molded boots with different soles and uppers are molded by injecting the molding material twice. In the case of molding these boots, after the first side is injection molded, when the dummy last is released, the sole separates from the bottom mold and lifts up, and when the torso is injection molded on the second side of this sole, The torso molding material invaded the side or lower surface of the sole and stuck to the surface of the sole, making the appearance of the injection molded shoe dull. A means for preventing this is disclosed in Japanese Patent Publication No. 59-43-162. FIG. 5 shows an example of the bottom mold disclosed in this publication and a method of manufacturing injection-formed boots using the bottom mold. In the figure, 50 indicates a bottom mold. On the upper surface 52 of the bottom mold 50, a dovetail-shaped protrusion 54 having an inversely tapered side wall 540 is formed on a part or the entire surface of the bottom mold design. When manufacturing injection molded shoes using the bottom mold 50 having such a structure, when the dummy last 53 is separated from the bottom mold 50 after the sole 51 is injection molded, the sole 5l is caught on the side wall 540. Take, bottom mold 5
It is possible to prevent the sole 5L from peeling off from 0. Therefore, when the torso (not shown) is injection molded, the torso molding material does not invade the side or lower surface of the sole 5l, and injection molded boots with a good appearance can be obtained.

[Problems with conventional technology]

According to this invention, it is possible to prevent the sole 51 from peeling off from the bottom mold 50 when the dummy last 53 is released. However, since the dovetail-shaped protrusion 54 is formed in the bottom mold design, the contact surface of the sole 5l of the manufactured injection molded shoe has a dovetail-shaped recess 60 as shown in FIG. A concave groove 60 whose width becomes narrower toward the center is formed. If a foreign object such as a stone gets into the recess 60, it cannot be removed easily, causing irritation to the sole of the foot and making it uncomfortable to wear. In order to solve this problem, the width of the tip of the protrusion formed on the bottom mold must be shorter than or the same as the width of the base.

[Purpose of the invention]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to manufacture injection-forming shoes, such as shoes with soles made of different parts in terms of color or material, or boots with different soles and upper parts. When separating the dummy last from the bottom mold, it can prevent the sole from peeling off from the bottom mold, and it also prevents foreign objects such as stones from getting stuck in the recess formed on the sole of the manufactured injection molded shoe. However, it is an object of the present invention to provide a bottom mold for injection molding shoes having a sole that is easy to remove and has good comfort and appearance. Another object of the present invention is to use the above bottom mold.
To provide a method for manufacturing injection molded shoes with good comfort and appearance.

[Structure of the invention]

The structure of the invention taken to achieve the above object is as follows. In the invention of a bottom mold for injection molded shoes, the mold is used for manufacturing injection molded shoes that are molded by multiple injections, and a protrusion that forms the design of the sole of the shoe is provided on the molding surface. The protruding body is formed such that the width at the tip is shorter than or equal to the width at the base end, and the side wall of the protruding body includes a side wall that prevents the sole from peeling off from the bottom mold when the dummy last is separated from the bottom mold. It has a protruding anti-peeling bottle to prevent this from happening. In the invention of a method for manufacturing injection molded shoes, the bottom mold according to the above invention is used in the method for manufacturing injection molded shoes in which injection molding is performed multiple times, and the lifting of the sole after injection molding of the first side is prevented. This is designed to prevent this. The protruding body is formed in an inverted dovetail shape in which the width of the tip is shorter than the width of the base end, or the width of the tip is approximately the same as the width of the base end. The word "same" includes "substantially the same". As shown in the embodiment described later, the anti-peeling bin is usually installed at an angle in the direction in which the injection molded shoes are taken out, but it can also be installed horizontally. If necessary, it can be provided so as to be inclined in the direction opposite to the direction in which the injection molded shoe is taken out. In other words, there are no particular limitations on the length or the direction in which the anti-peeling bottle is provided, and the purpose is to prevent the sole from peeling off from the bottom mold when the dummy last is separated from the bottom mold.
When taking out the completed injection molded shoe from the bottom mold, it can be set as appropriate within a range that is easy to take out and does not cause defects to the injection molded shoe. Anti-peeling bottles can be provided on all protrusions,
It can also be installed on some protruding bodies. Furthermore, multiple pieces can be provided on one protrusion. Function: When the sole is injection molded and the dark last is removed from the bottom mold, the sole gets caught in the anti-peel bin. Therefore, when the dummy last is separated from the bottom mold, it is possible to prevent the sole from peeling off from the bottom mold. In addition, on the contact surface of the sole of manufactured injection molded shoes, there is a void formed in the shape of an inverted dovetail where the width of the base end is shorter than the width of the tip, or where the width of the base end is the same as the width of the tip. . Therefore, even if a foreign object such as a stone gets into the gap, it can be easily removed and does not affect the comfort of wearing.

【Example】

The present invention will be explained in more detail based on embodiments shown in the drawings. FIG. 1 is a schematic cross-sectional view of the bottom mold. In the figure, IO indicates the bottom mold. On the upper surface 12 of the bottom mold 10, there is a protrusion l that satisfies the relationship a≦b.
4 is formed in plurality. A part of the protruding body 14 has a bottom mold l having a peel prevention bottle 16 installed on its side wall 140 so as to be inclined toward the direction in which the injection molded shoe is taken out.
A molding material injection port 18 for the sole is provided at the heel of the shoe O. FIGS. 2 and 3 are explanatory diagrams showing a method of injection molding rain boots using the bottom mold shown in FIG. 1. After injecting the molding material from the molding material injection port 18 into the sole molding gap (shown filled with molding material in the figure), which is the space between the bottom mold 10 and the dummy last 20, the bottom mold is The dummy last 20 is separated from the IO to manufacture the sole 30. After ejecting the sole 30, when separating the dummy last 20 from the bottom mold 10, peel it off! 1 Since the fat retaining bottle 16 is stuck into the sole 30, the sole 30 is caught on the peeling prevention bottle l6, and the sole 30 can be prevented from peeling off from the bottom mold 10. Thereafter, as shown in FIG. 3, the main body last 32 and side molds 34 are placed on the bottom mold IO, and the upper part 37 is injection molded on the sole 30 by a well-known method. FIG. 4 is an explanatory view with a part of the boots obtained by the manufacturing method shown in FIGS. 2 and 3 cut away. On the contact surface side 3l of the sole 30, there is a relationship a≦b formed between the plurality of protrusions 35 forming the design (dimensions are roughly the same as a and b shown in FIG. 1). A plurality of void portions 36 are formed. Since this gap 36 has the above-mentioned relationship, the gap 36 is formed in the sole surface of the manufactured injection-molded shoes.
It is difficult for foreign objects such as stones to become clogged, and even if it becomes clogged, it is easy to remove. It should be noted that the present invention is not limited to the illustrated embodiment, and many modifications can be made within the scope of the claims.

【Effect of the invention】

The present invention has the following effects. (1) On the side wall of the protrusion formed on the bottom mold,
Since the anti-peeling pin is provided protrudingly, when the sole is molded, the anti-peeling pin is stuck into the protrusion C that forms the design of the sole. Therefore, when the dummy last is separated from the bottom mold after the sole is injection molded, the sole is caught in the peeling prevention bin, thereby preventing the sole from peeling off from the bottom mold. (2) When the mold according to the wooden invention is used, lifting of the sole formed by injection molding on the first side can be prevented.
For this reason, when injection molding the second side of a shoe sole molded by injection molding of the first side to form another sole part or the upper part of the boot, the injection molded material of the second side is Injection molded shoes with a good appearance can be obtained without intrusion into the side or lower surface C of the sole molded by injection molding on the first side. (3) A void portion is formed in the sole surface of the manufactured injection molded shoe, the width of the tip being longer than or substantially the same as the width of the base. Therefore, even if a foreign object such as a stone gets into this gap, it can be easily removed, providing a comfortable feeling. (4) The anti-peeling bottle is provided on the side wall of the protrusion. Therefore, although the bottle hole is formed on the side wall of the protrusion that forms the design formed on the sole of the injection-molded shoe, it is difficult to see from the outside, and the texture of the injection-molded shoe can be maintained.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of the bottom mold, FIGS. 2 and 3 are explanatory diagrams showing a method of injection molding boots using the bottom mold shown in FIG. FIGS. 2 and 3 are partially cutaway explanatory views of boots obtained by the manufacturing method shown in FIGS. 2 and 3, and FIG. FIG. 6 is a partially cutaway explanatory view of the boots obtained by the manufacturing method shown in FIG. 5. 10: Bottom mold l4: Projection body l40: Side wall l6: Peeling prevention pin

Claims (1)

[Scope of Claims] 1. Used in the manufacture of injection molded shoes that are molded by multiple injections, the molding surface is provided with a protrusion that forms the design of the sole, and the protrusion is formed such that the width of the tip is shorter than or the same as the width of the base end, and the side wall of the protrusion has a peeling prevention plate that prevents the sole from peeling off from the bottom mold when the dummy last is separated from the bottom mold. A bottom mold for injection molding shoes characterized by a protruding pin. 2. A method for manufacturing injection molded shoes in which injection molding is performed multiple times, using the bottom mold according to claim 1 to prevent the sole from lifting up after injection molding of the first side. A method of manufacturing injection molded shoes.