Twin-sheet thermoforming process and apparatus for insert...

Details Twin-sheet thermoforming process and apparatus for insert... Twin-sheet thermoforming process and apparatus for insert...

2008-02-07

2010-02-23

Davis, Robert B (Department: 1791)

Plastic article or earthenware shaping or treating: apparatus

Preform assembly means and means for bonding of plural...

With treatment means other than assembling, bonding, shaping...

C425S515000, C425S519000, C425SDIG048

Reexamination Certificate

active

07665982

ABSTRACT:
A twin-sheet thermoforming process and associated apparatus which enables placement of an insert between upper and lower sheets before the sheets are actually heated and formed is described herein. Since the insert is positioned before molding takes place, the insert does not cause the formed panels to rest and cool down before fusing is finally carried out to capture the insert and seal the panels to each other. Panel fusing may therefore be performed at an optimal temperature.

REFERENCES:
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patent: 3412183 (1968-11-01), Anderson et al.
patent: 3783078 (1974-01-01), Brodhead
patent: 3914104 (1975-10-01), Dean et al.
patent: 5197396 (1993-03-01), Breezer et al.
patent: 5401456 (1995-03-01), Alesi et al.
patent: 5758855 (1998-06-01), Jordan et al.
patent: 6294114 (2001-09-01), Muirhead
patent: 6705853 (2004-03-01), Nehring

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