Vacuum compression method for forming molded thermoplastic floor

Details Vacuum compression method for forming molded thermoplastic floor Vacuum compression method for forming molded thermoplastic floor

1998-07-08

2000-08-08

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Vacuum treatment of work

To degas or prevent gas entrapment

264294, 264322, 264325, 425384, 425437, 425411, 4254051, B29C 3516, B29C 4304, B29C 4314, B29C 4350, B29C 4356

Patent

active

060997710

ABSTRACT:
Method for making flexible, noncarpeted thermoplastic articles, including floor mats. The method includes placing a flat slab of thermoplastic material in a cavity between first and second mold sections with each mold section having a mold surface for contacting a respective surface of the slab. The mold cavity is placed under vacuum and the mold sections are heated under compression to cause the thermoplastic material to heat and flow against the mold surfaces. The process further involves cooling the mold sections under compression and removing the floor mat from the mold sections. Vacuum is maintained in the mold cavity by way of a check valve device during transition from the heated compression apparatus to the cooled compression apparatus and during the cooled compression step. In this general manner, a floor mat formed with a Class A, textured finish and with a variable cross sectional thickness may be manufactured in a short cycle time.

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