JPH0131883B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a guide molding method for injection molding of shoes.

(Prior Art) Conventionally, as shown in Japanese Patent Publication No. 55-29681, an injection mold for shoes consisting of a last with a hanging cover, a side mold, and a bottom mold,
On the lip plate part of the side mold, a guide formed along the shape of the lower circumferential side of the shoe cover that has been suspended from the last is fixed in advance, and the guide is pressed against the lower circumferential side surface of the shoe cover during sole injection molding. The sole is injection molded to prevent the sole molding material from protruding from between the lip plate and the shoe cover suspended from the last and contaminating the lower peripheral side of the shoe cover during sole molding. is proposed. Such injection molds for shoes can be made in various shapes by replacing only the guides, which have been molded in advance to correspond to the thickness or design of each shoe. It can also be used to mold shoes with thick or designed overlays, and is very economical. However, in such a mold, on the other hand, various guides are formed in advance to correspond to the thickness or design of the cover of the shoe to be molded. hand,
The cover must be accurately positioned and fixed on the lip plate along the shape of the lower peripheral side surface of the cover, which is very complicated and inefficient.

(Problems to be Solved by the Invention) The present invention eliminates these drawbacks and accurately creates a guide corresponding to the thickness or design of the shoe cover to be molded on the lip plate by a simple method. It is intended to be fixedly molded.

(Means and Examples for Solving the Problems) This invention will be explained below with reference to practical drawings.
This invention relates to a shoe injection mold consisting of a last 2, side molds 3, 3, and a bottom mold 4, in which a shoe cover 1 is suspended, and a shoe cover 1 is suspended on lip plate portions 31, 31 of the side molds. A gap 51 is provided on the last 2 side to form guide molding gaps 5, 5, and an elastic material is injected into the guide molding gaps 5, 5 so that the side surfaces 61, 61 follow the outer shape of the lower circumference of the sleeve 1. The gist of the invention is a guide molding method for an injection mold for shoes, which is characterized in that guides 6, 6 are molded.

In this invention, the guide molding gaps 5, 5 are
Lip plate portions 31, 31 of the side molds, auxiliary molds 32, 32 fixed to the upper surfaces thereof, and a cover 1 with a release layer 11 formed on the surface if necessary.
It is composed of the last 2 with which it is suspended.

In the guide molding gaps 5, 5, the gaps 51, 51 provided on the side of the last 2 from which the shoe cover 1 is hung are slightly spaced in accordance with the maximum thickness of the shoe cover that is expected to be molded. It is preferable that the width be formed. If the auxiliary molds 32, 32 are made removable from the lip plate portions 31, 31 of the side molds, the auxiliary molds 32, 32 can be removed when the molding of a shoe having a certain thickness or design is completed. Once removed, the guides 6, 6 can be easily removed. In this invention, the guide molding cavities 5, 5 are communicated with the sole molding cavity 8 through the passage 52, and when a shoe having a certain thickness or design of the heel is first molded, the sole molding cavity 8 It is convenient because the guides 6, 6 can be molded at the same time as the sole 9 by filling the guide molding gaps 5, 5 with a part of the sole molding material injected into the shoe sole 9 through the passage 52. It is. Of course, in this invention, the guides 6, 6 may be molded separately from the sole 9. In this invention, the guides 6, 6 are molded from a solid or foamable elastic material such as polyurethane, EVA, PVC, rubber, etc.
When molded with a thermoplastic elastic material such as PVC or thermoplastic rubber, the guides 6, 6 and the lip plate portion 3 of the side mold are molded as necessary.
If the heat insulating materials 62, 62 are interposed between the guides 6, 6 and the injection mold, the heating of the side molds 3, 3 during the molding of the sole 9 can be avoided. Therefore, the guides 6, 6 do not soften and flow, so the durability of the guides 6, 6 can be significantly improved.

In this invention, when the elastic material is injected and filled into the guide molding cavities 5, 5, the elastic material is suspended in the last 2 forming a part of the guide molding cavities 5, 5 by injection pressure or foaming pressure, and further In some cases, the parting layer 11 is pressed against the lower circumferential side of the parting cover 1, and after solidifying it, the last part 2 with the parting part 1 suspended therein is removed from the side molds 3, 3. Guides 6, 6 are formed having side surfaces 61, 61 shaped in accordance with the thickness or design of the outer surface of the lower periphery of the cover 1. Then, if necessary, the protruding portions 611, 611 formed protruding from the gap 51 are removed to complete the guides 6, 6. Using the injection molding mold having the guides 6, 6 formed in this way, the cover 1 of the thickness or design used in molding the guides 6, 6 is suspended from the last 2, and then When the sole molding material is injected into the sole molding cavity 8 to mold the sole 9, the side surfaces 61, 61 of the guides 6, 6 will have a shape that follows the thickness or design of the lower peripheral side surface of the shoe cover 1. Because of this, the side surfaces 61, 61 of the guides are tightly attached to the lower circumferential side of the shoe cover 1 during sole molding, and the sole molding material does not protrude to the lower circumferential side of the shoe cover 1, improving the appearance. You can get good shoes. In this way, when the molding of a shoe having a shoe cover 1 of a certain thickness or design was completed, the guides 6, 6 were removed, and a shoe cover 1' having a different thickness or design was hung. Using last 2', guide 6',
After injection molding 6', shoes with other thicknesses or designs of hemlocks are similarly molded.

(Effects of the Invention) As described above, in this invention, the guides 6, 6 are fixedly molded by injection molding, so there is no need to position the guides as in the conventional case, and the guides can be accurately adjusted to the wall thickness or design of the cover 1. Guides 6, 6 having side surfaces 61, 61 having a contoured shape can be easily provided.

[Brief explanation of drawings]

The drawing shows an embodiment and is a sectional view of a main part showing a molded state of the guide. Explanation of symbols, 1, 1'... sash cover, 11... release layer,
2, 2'...last, 3...side mold, 31...
Lip plate part, 32... Auxiliary mold, 4... Bottom mold, 5... Guide molding gap, 51... Gap, 52... Passage, 6, 6'... Guide, 61... Side surface,
611...Protruding portion, 62...Insulating material, 8...Sole molding cavity, 9...Sole.

Claims (1)

[Claims] 1 In a shoe injection mold consisting of a last 2 on which a shoe cover 1 is hung, side molds 3, 3, and a bottom mold 4, the last 2 side on which a shoe cover 1 is hung on the lip plate portions 31, 31 of the side mold. A gap 51 is provided in the guide molding cavities 5, 5 to form guide molding cavities 5, 5, and an elastic material is injected into the guide molding cavities 5, 5. 6. A guide molding method for an injection mold for shoes.