JPH04242602A - Injection molded shoe and manufacture thereof - Google Patents

Abstract

PURPOSE:To clarify a difference between properties of blanks in the laminated front and rear surface layers from the sole surface to center portion of shoe on the laminated section of the sole provided with various kinds of sole materials, and improve the efficiency of operation without manual operations. CONSTITUTION:A dummy bottom mold 14a is installed in a spot wherein an injection material for the sole surface and the like of the instep material 11 side is secondarily injected in the subsequent process. Section of the bottom surface and instep surface are selected in a process of primarily injecting the injection material and a process of removing the dummy bottom mold 14a for secondary injection in a cavity covered with the dummy bottom mold 14a. Injection materials different in the respective sections are injection molded with identical injection blank from the surface to instep material 11, etc., and an injection molded shoe is obtained which is provided with the contact surfaces between the different injection materials having steps or inclination.

Description

[Detailed description of the invention]

0001

TECHNICAL FIELD The present invention relates to injection molded shoes and a method for manufacturing injection molded shoes. More specifically, the present invention relates to an injection molded shoe in which different types of injection molding materials are injected into shoe soles and other shoe sole materials, and a method for manufacturing the same shoe.

0002

[Prior Art] Conventionally, in order to manufacture shoes in which different types of sole materials are provided on the sole of the shoe, as shown in FIG. A back layer 103 with only the projections 102 protruding from the bottom surface is adhered to the bottom surface of the spruce material, and then a surface layer 104 with holes 105 formed in the portions corresponding to the projections 102 is attached to it so that the projections 102 are not covered. Layer from above. And back layer 1
03 is made of a solid material such as vinyl chloride or polyurethane, the surface layer 104 is made of various types of sponge, and the back layer 104 is made of a solid material such as vinyl chloride or polyurethane.
By locating the protrusion 102 of No. 03 at the base of the big toe, a sole can be obtained that has elasticity as a whole while providing strength in necessary areas.

0003

[Problems to be Solved by the Invention] However, as shown in FIG. 8 in a conventional shoe sole provided with a different type of sole material, the surface layer 104 laminates in the surface layer 104.
Instead of consisting only of 04, a surface layer 104 and a back layer 103 are laminated from the bottom to the center of the shoe, and the problem is that the difference in properties from the part consisting only of the surface layer 104 is not clear. Furthermore, there was a problem in that the injection molded materials peeled from each other.

Furthermore, in order to manufacture such shoes, holes 105 in the surface layer 104 and protrusions 10 in the back layer 103 must be formed.
2 had to be glued together, which had to be done manually, resulting in a lack of work efficiency.

[0005]

[Means for Solving the Problems] The present invention includes a step of attaching a sash material to the last, and a dummy mold is installed at a location where injection material is injected on the bottom surface of the sash material side or on the sash surface in a subsequent step, and the sash material is molded while being covered. The step of injecting the injection material into the gap between the mold and the sash material side, remove the dummy mold, cover the sash material again with the mold, and inject the injection material into the gap between the sash material and the mold at the part that was covered with the dummy mold. A manufacturing method for injection molded shoes characterized by the step of injecting a material, and a method for manufacturing injection molded shoes, which comprises a step of injecting a different injection material for each part by selecting a part of the bottom or a sole, and injecting the same injection material from the surface to the shoe or midsole. Injection-molded shoes are made of injection molded materials, and the contact surfaces of different injection materials are stepped, and the sole or lace-up part is selected and a different injection material is applied to each part from the surface to the lace-up material. Alternatively, the shoe is made of an injection molded shoe characterized in that even the inner sole material is injection molded using the same injection material, and the contact surfaces of the different injection materials are sloped.

[0006]

[Function] Attach the spruce material to the last. Then, in a subsequent step, a dummy mold is installed at a location on the bottom surface of the lace material side or on the lace surface where the injection material is to be injected, and the lace material is covered with the mold while covering the same portion. Next, the injection material is injected into the gap between the mold and the spout. Then, the injection material is injected into the gap other than the area covered with the dummy mold. Next, the dummy mold is removed, the lace material is covered with the mold again, and the injection material is injected into the gap between the lace material and the mold at the portion covered with the dummy mold. Then, an injection-molded shoe is obtained in which the bottom surface or the sole surface is selected and injection molded using the same injection material from the surface to the heel material or the midsole material, with different injection materials for each portion. In this shoe, each part is injection molded with a different injection material, from the surface to the heel material or the midsole material, so the properties of the injection material are clearly different depending on the part where the different injection material is injected. Further, since the contact surfaces of different injection materials are provided with a step or the contact surfaces of different injection materials are provided with an inclination, the contact area between the different materials is increased and the adhesive force is strengthened.

[0007]

[Example] FIG. 1 shows a cross-sectional view during the primary injection of an embodiment of the present invention, and FIG. 2 shows a cross-sectional view during the secondary injection.
, FIG. 3 showing a sectional view of the injection molded shoe of the example, FIGS. 4 and 5 showing the cross section of other injection molded shoes, and FIGS. 6 and 7 showing enlarged sectional views of the primary and secondary injection joints. Therefore, I will explain.

[0008] Reference numeral 11 is a lace material, and 12 is an insole material. Seed material 1
1 and the midsole material 12 are sewn together near the peripheral edge of the midsole material 12. Reference numeral 13 denotes the last, from which the tie material 11 with the midsole material 12 sewn is hung. 14a is a dummy bottom mold, 14b is a bottom mold on-men, 15a and 15b are molds, 15a is a bottom mold, and 15b is a side mold. The dummy mold 14a has a shape that matches the secondary injection part 22 in the gap created when the lace material 11 etc. is attached around the suspended last 13, and has a shape that contacts the last 13 with the midsole material 12 in between. Become. Dummy bottom mold 14
a is attached to the bottom mold on-men 14b by bolts 41, 41. Dummy bottom mold 1
Since the joint surface between 4a and the bottom mold on-men 14b is formed flat, processing operations are easy. Furthermore, the bottom mold on-men 14b is mounted on the bottom mold 15a. A shoe sole design for secondary injection is formed on the bottom mold 15a. The contact surface between the dummy bottom mold 14a and the primary injection part 21 is provided with a step 31 or a slope 32, as shown in FIG. 6 or 7. In the embodiment shown in FIG. 4, since the shoe is a so-called safety shoe, an iron core protector 16 is placed in advance on the toe portion of the primary injection portion 22, the first base of the toe portion, and the toe portion of the heel portion. Reference numeral 17 denotes a primary injection port provided in the side mold 15b, through which the injection material is injected into the primary injection portion 21. Reference numeral 18 denotes a secondary injection port provided in the side mold 15b, through which the injection material is injected into the secondary injection portion 22.

Next, a method for manufacturing injection molded shoes will be explained. The tie material 11 to which the midsole material 12 is sewn is hung and attached to the last 13. Next, in the secondary injection step of the subsequent process, a dummy mold 14 is installed at a location where the inner sole material 12 on the side of the lace material 11 or the injection material of the lace material 11 is injected, that is, the secondary injection part 22, and the dummy mold 14 is placed in the secondary injection part 22 to cover the same part while the lace material 11 is injected. , the inner sole material 12 is covered with a side mold 15b. Then,
The injection material is injected from the primary injection port 17 into the gap 21 formed between the side mold 15b, the dummy bottom mold 14a, the lace material 11, and the midsole material 12 side. Then, the injection material is injected into the void area other than the area covered by the dummy bottom mold 14a, that is, into the primary injection area 21.

Next, the dummy bottom mold 14a is removed, the bottom mold 15a is raised, and the splint material 11 is reattached.
, the inner sole material 12 is covered with the side mold 1b, and the part of the part covered with the dummy bottom mold 14a, that is, the secondary injection part, is removed from the side mold 1.
The injection material is injected from the secondary injection port 18 into the gap formed by the mold 5b and the bottom mold 15a, that is, into the secondary injection portion 22. As the injection material for the primary injection, PVC solid, PU solid, TR, etc. are used. As the secondary injection material, foamed PVC, foamed PU, foamed TR, etc. are used. The difference between the primary injection material and the secondary injection material may be a difference in color. The contact surfaces may be hand-blasted to create an uneven surface.

[0011] Then, an injection molded shoe is obtained in which the bottom surface or the sole surface is selected and the same injection material is used for each portion, and the same injection material is used from the surface to the sole material 11 or the midsole material 12. In this shoe, each part is injection molded using a different injection material from the surface to the lace material 11 or the midsole material 12, so that the properties of the injection materials are clearly different depending on the parts injected with different injection materials. Furthermore, the contact surfaces of different injection materials are stepped, as illustrated in FIG. 6, or the contact surfaces of different injection materials are sloped, as illustrated in FIG. The contact area becomes larger and the adhesive force is strengthened.

As shown in FIG. 3, the base of the first toe, the toe, and the heel are made of a solid material such as PVC, PU, or TR, and the rest of the bottom is made of foamed PVC.
When molded from sponge materials such as foamed PU and foamed TR, if an anti-slip design is also formed on the solid part, injection molded shoes with excellent cushioning properties and excellent durability can be obtained while increasing the anti-slip properties. It will be done. Furthermore, since the cushion material is directly and integrally bonded to the lace material 11, there is no chance of it falling off. It is preferable that the regular material has a specific gravity of 1.0 to 1.2, and the sponge material has a specific gravity of 0.6 to 0.9.

[0013]

[Effects of the Invention] Therefore, in this invention, without manual work, by selecting parts of the bottom surface or the shank surface, different injection materials are applied to each part, and the same injection material is used from the surface to the shank material or the midsole material. An injection molded shoe is obtained. In this shoe, each part is injection molded with a different injection material, from the surface to the heel material or the midsole material, so the properties of the injection material are clearly different depending on the part where the different injection material is injected. Furthermore, the contact surfaces of different injection materials are provided with a step, or the contact surfaces of different injection materials are provided with an inclination, so that the contact area between different materials is increased, the adhesive force is strengthened, and the injection molding material No peeling occurs.

[Brief explanation of the drawing]

[Figure 1] Cross-sectional view of the example during primary injection

[Figure 2]
Cross-sectional view of the example during secondary injection

[Figure 3] Cross-sectional view of the injection molded shoe of the example

[Figure 4] Cross-sectional view of injection molding of another embodiment

[Figure 5] Cross-sectional view of injection molded shoes of other embodiments

[Fig. 6] Enlarged sectional view of the primary and secondary injection joints of the shoe according to the example

[Fig. 7] Enlarged cross-sectional view of the primary and secondary injection joints of shoes of other embodiments

[Figure 8] Enlarged cross-sectional view of a conventional shoe sole

[Explanation of symbols]

１１　　　　Shi material 12 Insole material 13 Last 14a Dummy mold 15a Bottom mold 15b Side mold

Claims (3)

[Claims] [Claim 1] In the step of attaching the lace material to the last, in the subsequent process, a dummy mold is installed at the place where the injection material is to be injected on the bottom surface of the lace material side or on the lace material side. The process consists of the step of injecting the injection material into the gap of the dummy mold, the step of removing the dummy mold, covering the sash material again with the mold, and injecting the injection material into the gap between the sash material and the mold at the part covered with the dummy mold. A unique method for manufacturing injection molded shoes. [Claim 2] The bottom surface or the flange surface part is selected, and each part is injection molded with a different injection material from the surface to the lace material or the inner sole material, and the contact surfaces of the different injection materials have no level difference. An injection molded shoe comprising: [Claim 3] The bottom surface or the flange surface part is selected, and each part is injection-molded with a different injection material from the surface to the lace material or the inner sole material, and the contact surfaces of the different injection materials are sloped. An injection molded shoe comprising: