Method of thermoforming a sheet material
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United States of America Patent
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Jun 15, 1999
Grant Date -
N/A
app pub date -
Jul 7, 1997
filing date -
Jul 7, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to a method of thermoforming a sheet material around an insert to make a thermoformed article. The sheet material may include poly(methyl) methacrylate and other thermoplastic sheet material. The inserts become an integrated part of the thermoformed product, and are characterized by having at least one removable portion or plug. The plug(s) are removed during the thermoforming process, and allow the thermoformed sheet material to shrink without creating undesirable levels of stress in the sheet material. This prevents cracking or other failure of the sheet material.
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