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US5558831A Hinge heating and folding method 失效
铰链加热折叠法

Hinge heating and folding method
摘要:
A method to locally heat a thermoplastic hinge and fold its semicylindrical members together so as to form a film cartridge. The cooled integrated hinge is locally heated in a manner whereby the semicylindrical members remain cool. When the thermoplastic hinge is ductile from the heat, the semicylindrical members are folded together.
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