Method and apparatus for vacuum/pressure thermoforming

Details Method and apparatus for vacuum/pressure thermoforming Method and apparatus for vacuum/pressure thermoforming

B - Operations, Transporting

29

D

B29D 22/00 (2006.01) B29C 43/56 (2006.01)

Patent

CA 2098067

An apparatus and method for plug-assisted thermoforming of a cup or other hollow article has a concave well or cone region machined into its top with a series of small holes drilled near the deepest part of the well and connected to a port inside the plug which is connected to a specifically sized manifold system. The manifold has a source for positive (pneumatic) and negative (vacuum) pressure air. During the machine cycle, a vacuum is introduced into the plug, which draws the hot plastic sheet into the plug well to stretch it. The vacuum is replaced by compressed air to transfer the pre-stretched sheet into a mold. In a particularly preferred embodiment, the plug is shaped to provide stretching in both the central well and in peripheral regions concentric with the well. Controlled air pressure in the mold may be used to provide the concentric prestretching.

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