Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Starting material is nonhollow planar finite length preform...
Patent
1988-11-23
1992-04-28
Ball, Michael W.
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Starting material is nonhollow planar finite length preform...
264327, 264101, 264296, 264345, 156220, 156245, 156285, 156311, 156497, 156498, 425404, 425446, B29C 5100
Patent
active
051086913
ABSTRACT:
A thermoformable mat, e.g., a mat of resinated fiberglass, is compressed and shaped into a contoured object, e.g., a shell for an automobile headliner, by this process. The mat is compressed between two dies that have been preheated. At least one of the dies is perforated. Superheated steam (e.g., at 80 psig and 600.degree. F.) is ejected from the perforations into the mat, thereby quickly raising the mat temperature to its thermoforming point. After the mat is set into the contoured shape, the dies are reopened and the formed mat is removed. If the mat that is used contains a thermoplastic adhesive, the mat is cooled to below the adhesive's melt print before the dies are opened. This can be done by applying a vacuum to the perforated die and pulling ambient air through the mat.
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Astechnologies, Inc.
Ball Michael W.
Osele Mark A.
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