Thermoforming process for forming a sheet of polybutylene tereph

Details Thermoforming process for forming a sheet of polybutylene tereph Thermoforming process for forming a sheet of polybutylene tereph

1991-03-26

1993-05-25

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Starting material is nonhollow planar finite length preform...

2642102, 264235, 26433121, 264346, 264553, B29C 5102, B29C 5142

Patent

active

052137546

ABSTRACT:
A transparent polyester container is produced by melt-molding a copolyester resin containing 75 to 98 molar % of repeating units of an ester of terephthalic acid with 1,4-butanediol with the balance mainly containing repeating units of an ester of terephthalic acid with an alkylene oxide adduct of a bisphenol compound, rapidly cooling the molding to prepare a sheet having a low crystallinity, maturing the sheet at a temperature selected so as to meet a requirement represented by the following formula (1) to prepare a sheet satisfying a requirement represented by the following formula (2) and subjecting the sheet to thermoforming through the use of a cavity mold at a temperature falling within a range represented by the following formula (3):

REFERENCES:
patent: 4110395 (1978-08-01), Akutin et al.
patent: 4261473 (1981-04-01), Yamada et al.
patent: 4380526 (1983-04-01), Agrawal
patent: 4388356 (1983-06-01), Hrivnak et al.
patent: 4469270 (1984-09-01), Gartland
patent: 4725664 (1988-02-01), Halmess et al.
patent: 4878826 (1989-11-01), Wendt

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