SHOEMAKING BY MOLDING WITH AN ADHESIVE

1,253,265. Boots &c. BRITISH UNITED SHOE MACHINERY CO. Ltd. 10 Feb., 1969 [12 Feb., 1969], No. 7010/69. Heading A3B. [Also in Division D1] A method of moulding a sole onto a shoe upper 14 includes the steps of securing a web 10 of strands of an adhesive composition to the bottom of the lasted upper 14 and inpecting molten material into a mould cavity 33 to form the sole 26, the web 10 being heated by the molten material to activate the adhesive composition to improve the bond between the bottom of the lasted upper 14 and the sole 26. The excess adhesive composition 40 is removed from the shoe by a rotating brush or a hot knife. The adhesive web 10 may be sewn to the edge of an upper 14 before it is string lasted (Fig. 2) or may be bonded to a cementlasted upper by heating the web 10 and/or shoe bottom and pressing them together. Alternatively the web 10 may be adhered to a carrier layer, e.g. of paper, which has the same shape as the shoe bottom but is smaller so that the carrier layer just reaches the edge of the lasting margin. Suitable materials for the web are polyesters, polyamides, polyesteramides, and thermoplastic polyester glycol urethanes or polyether glycol urethanes. The sole material is preferably polyvinyl chloride.