Method of thermoforming a sheet material

Details Method of thermoforming a sheet material Method of thermoforming a sheet material

1997-07-07

1999-06-15

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

264554, 264237, 264322, 475504, 475388, B29C 5112, B29D 2200

Patent

active

059119438

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.

REFERENCES:
patent: 2876498 (1959-03-01), Nason
patent: 4608744 (1986-09-01), Nemoto
patent: 5514315 (1996-05-01), Watkins et al.
patent: 5525290 (1996-06-01), Carpenter

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