Shoe part forming by injection moulding and insert thereof

Abstract

The invention relates to a method for manufacturing a shoe part by injection moulding a material into a mould where an insert is placed. The insert comprises at least two separable insert parts, an upper insert part and a lower insert part, providing an injection channel in the region of the separation area between the two parts. The insert is placed in the chamber and the injection material is injected through a sprue channel in the mould into the injection channel and into a cavity, whereby the shoe part is formed. The mould is opened after the injection material has cured and the insert is separated into the upper and lower insert parts, thereby exposing the cured material in the injection channel.

Description

technical field

[0001] The present invention relates to a method for manufacturing a or A method of a plurality of shoe parts, the mold being provided with a chamber for injection molding a shoe part and for placing a shoe part forming insert in the mold. The invention also relates to a shoe forming insert. Background technique

[0002] WO 2011 / 054509 describes a method for the manufacture of multi-density shoe soles comprising repeated injections of sole material onto a shoe upper mounted on a last and placed in a mould. The method comprises placing the insert in the mold through sprue channels arranged in the mold before the first shot is made. After the first shot of material has solidified, the insert is removed and a second shot is made through a second gate channel arranged in the mould. The disadvantage of this solution is that it always requires two injection channels arranged in the mold, which makes the mold complex and more expensive than a mold provided with o...