Apparatus and method for molding polyester articles having low a

Details Apparatus and method for molding polyester articles having low a Apparatus and method for molding polyester articles having low a

1997-10-24

1999-11-09

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Utilizing special inert gaseous atmosphere or flushing mold...

159 22, 264102, 26421121, 26421123, 425203, 425204, 425207, 425209, 528483, 528492, 528501, B29C 4738, B29C 4750, B29C 4776

Patent

active

059807970

ABSTRACT:
An apparatus and a method for molding of polyester articles having low acetaldehyde content directly from a melt without intermediate solidification of the molten polyester. A melt to mold process is used wherein an acetaldehyde stripping agent is mixed into a polyester melt before devolatilization in a flash tank. The devolatilized polyester is pumped out of the flash tank and injected into a mold, thus forming a shaped article. The apparatus may include one or more flash tanks in one devolatilization line, or multiple devolatilization lines may be used stemming from one main polymerization reactor. The final shaped article should contain less than 10 ppm of acetaldehyde.

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