JPS6249801A - Production of shoes - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing shoes having soles formed by injection molding or press molding.

[Conventional technology]

Conventionally, soles formed by injection molding or press molding are often used for chemical shoes and cloth shoes. Conventionally, as a means of reducing the weight of the shoe sole, as shown in FIG. Alternatively, as shown in FIG. 3, a filling part (fourth
There are various methods for embedding it in a molded body.

[While the invention is trying to solve the problem, point
It is extremely difficult to completely seal the space surrounded by shoes and to maintain this sealed state while the shoes are being worn. The disadvantage is that dirt and sand can enter the shoe sole, and once dirt and sand have entered the space of the sole, it is impossible to remove them.

Another drawback is that it is difficult to dry the shoes after washing them or when water gets into them while driving.

In addition, when using the latter method, low-density foam such as EVA or urethane resin is the most desirable material for weight reduction, but it deforms due to heat and pressure during the sole molding and loses its restoring force after demolding. This has the drawback that distortion occurs due to the effect of the oxidation, and in practice it is difficult to select the material.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and provide a method for manufacturing shoes that does not cause deformation or distortion due to filling with a lightweight material.

[Failure to solve the problem]

The present invention provides a method for manufacturing shoes, in which a shoe sole is bonded to a molded sole, and an insole is laid on the inner surface of the molded sole, from the heel to the inner surface of the molded sole. A shoe characterized by providing an appropriately shaped recess over the non-stepping part or the stepping part, injecting a two-component foaming polyurethane stock solution into the recess, and filling the recess with a foam formed by foaming the stock solution. This is a manufacturing method.

[Example] Hereinafter, an example of the present invention will be described in which a shoe sole is molded by injection molding.

FIG. 1(A) shows the last mold 11 used in the method of the present invention.
It shows. The last mold 11 is provided with a convex portion 12 that has a gently curved surface and protrudes from the heel portion of the upper surface of the sole to be molded to the non-stepped portion or the stepped portion beyond the heel portion.

FIG. 1(b) shows a state in which a shoe cover J3 is suspended in the last mold 11, and this is combined with a sole mold 14 and a side mold 15 for forming a shoe sole. A shoe sole molding space is formed between each mold. A shoe sole molding resin material M is injected into the space in this mold, filling the space and solidifying it.

FIG. 1 Pi shows a state in which the last mold 11 has been removed after the resin has hardened. The inner surface of the molded shoe sole 16 obtained in the mold is patterned after the shape of the convex part 12 of the last mold 1.
A concave portion 17 on the upper surface from the heel portion to the non-stepped portion or the stepped portion
is formed.

1), the two-component foamed urethane resin stock solution f is injected into the recess 17 through the opening of the shoe cover 13, the insole 18 is placed on the upper surface of the insole, and the insole 18 is pressed down with a loose last mold 19 to open the recess 17. Seal the edges. The two-component foamed urethane resin stock solution f foams and rises 9 in the space closed by the insole 18, filling the space of the recess 17, and further, the foam stock solution permeates into the tissue of the insole 18. and solidify.

Figure 1←) shows a shoe obtained by demolding the molded product. In other words, the inside of the recess 17 formed in the molded sole 16 from the heel part to the non-stepped part or the stepped part is filled with polyurethane foam 20, and the shoe has an integrated sole including the insole 18. Become.

In the above embodiments, an example in which the sole of the shoe is manufactured by injection molding has been described, but the present invention can of course be applied to a shoe having a sole molded by a press molding method.

In the present invention, the concave portion is formed in two steps, and a high-density foaming solution is injected into the first step to mainly form the heel portion, and a low-density foaming solution is injected into the second step. It is also possible to increase the strength of the heel by filling the non-stepping part and the stepping part and foaming the foam.

In the present invention, the molding material for the shoe sole is soft vinyl chloride (
Of course, it is also possible to use materials such as PVc), thermoplastic rubber (TR), cross-linked rubber, etc., or to use a wear-resistant material as the ground sole to form a double bottom structure. Non-woven fabric is used for the insole, and the foaming solution is infiltrated into the insole and solidified into one piece. In addition, when foaming the stock solution in the recess of the molded sole, the example shows an example in which the recess is closed using an insole.
Alternatively, the recesses may be covered with a resin sheet that is removable to polyurethane, such as polypropylene, polyethylene, polyester, Teflon, etc., and the sheet after polyurethane foaming may be removed; A dummy last made of resin may be suspended to cover the recessed portion and removed after solidification of the foam.

In these cases, an insole is then placed on the inner surface of the sole.

〔Effect of the invention〕

As described above, according to the present invention, a two-component foamed polyurethane resin is injected into the recesses of a thickly formed shoe sole molding, and is foamed to fill the recesses, unlike the conventional method. There is no restriction on the material of the filling material for weight reduction, and there is no restriction on the use of molds for manufacturing the filling material, the molding process, and even the puffing of the filling material.
There is no need for any pre-treatment processes such as applying adhesive or burning, making it possible to fill directly, which greatly simplifies the molding process. , which can be joined together and fixed in place.

In addition, according to the present invention, the density of the foaming solution constituting the filling member can be freely adjusted. For example, by making the central part of the heel harder and the part from the heel to the treading part softer, excellent functionality can be achieved. This has the effect of improving cushioning properties, bending resistance, and comfort as well as lightness.

[Brief explanation of the drawing]

Figures 1 (A) to (E) are schematic diagrams showing the manufacturing process according to an embodiment of the present invention in order of process, and Figures 2 and 3 each show an example of manufacturing using a conventional weight reduction method. FIG. 3 is a cross-sectional view of the mold. l... Sole molded body, 2... Flange, 3... Steal, 4
...Filling member, 11...Last mold, 12...
・Convex portion, 13... Latch cover, 14... Sole mold for forming shoe soles,
15... Side mold, 16 Sole molded body, 17... Recessed part, 1
8... Insole, 19... Loose last mold, 20
...polyurethane foam, M...resin material for shoe sole molding, f...two-component polyurethane foam

Claims (1)

[Claims] (1) In a method for manufacturing shoes, in which a shoe sole is bonded to a molded sole, and an insole is laid on the inner surface of the molded sole, the inner surface of the molded sole includes a non-tread portion or A method for manufacturing shoes, which comprises: providing a recessed part of an appropriate shape over the treading part, injecting a two-component foamed polyurethane stock solution into the recessed part, and filling the recessed part with a foam formed by foaming the stock solution.