Patent ID: 7655178
Filing Date: 2010-02-02
Classification: B29C

Abstract:
1. A method for elongating a foil, comprising steps of: providing an injection molding device, the injection molding device comprising a male mold and a female mold, the male mold having a projecting pan protruding toward the female mold, the female mold defining a cavity corresponding to the projecting part, a channel defined in the male mold, a plug resiliently attached and movable in the channel for obturating the recessed portion of the channel and is capable of opening or closing the channel automatically; transporting the foil into the injection molding device between the male and female molds; clamping the male and female molds to form a molding space surrounded by an inner surface of the cavity of the female mold, the projecting part, and parts around the projecting part of the male mold, the molding space being separated into a first airproof space adjacent to the female mold and a second airproof space adjacent to the male mold by the foil; vacuuming the first airproof space to suck the foil toward the first airproof space; and inputting thermal medium into the second airproof space through the channel to press the foil to cling to the inner surface of the cavity of the female mold.