Thermoforming plastic type II
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United States of America Patent
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app pub date -
Aug 16, 2006
filing date -
Feb 16, 2005
priority date (Note) -
Abandoned
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Abstract
A sheet (10, 20) for use in a model vacuum thermoforming process, wherein the sheet (10, 20) has a thickened area (11) that may be in a preselected three-dimensional form such as arch-shape (12). The thickened area (11) or three-dimensional area (12) is placed over an area of the model (21) where the plastic sheet is to be stretched during the thermoforming process. This ensures a uniform or a preselected thickness in the stretched areas than would otherwise occur.
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