Plastic article or earthenware shaping or treating: apparatus – Distinct means to feed – support or manipulate preform stock... – Female mold type means
Patent
1982-03-19
1984-08-14
Hoag, Willard E.
Plastic article or earthenware shaping or treating: apparatus
Distinct means to feed, support or manipulate preform stock...
Female mold type means
12 332, 425129S, 4251744, 425441, 425444, 425576, B29F 114, B29F 1022
Patent
active
044654480
ABSTRACT:
A method and apparatus for making shoes of the type comprising an injection molded sole which is bonded to a marginal edge portion of a string lasting preferably made of a thermoplastic material. The lasting is held on a last. A radiant heater is automatically positioned below the lasting to preheat the marginal edge portion of the lasting until it is tacky, at about 150.degree.-200.degree. F., after which the heater is withdrawn and the last and the lasting are positioned at the top of a sole mold. Injection molding apparatus injects a molten thermoplastic sole material, such as polyvinyl chloride, at high temperatures of about 300.degree.-380.degree. F. into a sole cavity formed in the sole mold were the molten material bonds to the marginal edge portion of the lasting to form a completed shoe. The completed shoe is cooled by transferring it from the last which was employed during the molding operation to a cooling last separate from the machine. The completed shoe is rapidly cooled to down below 45.degree. F. in less than three minutes. The steps of preheating the lasting prior to molding the sole, and keeping the completed shoe warm until after injection molding whereupon the shoe is removed from the last and rapidly cooled on a separate cooling last provides a secure bond of the lasting and the sole as well as maintaining the desired shape of the completed shoe.
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Hoag Willard E.
Norwich Shoe Co., Inc.
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