Plastic article or earthenware shaping or treating: apparatus – Preform reshaping or resizing means: or vulcanizing means... – Including both heating and cooling means
Patent
1988-05-27
1990-03-13
Chiesa, Richard L.
Plastic article or earthenware shaping or treating: apparatus
Preform reshaping or resizing means: or vulcanizing means...
Including both heating and cooling means
264322, 425393, 425DIG218, B29C 5702
Patent
active
049079581
ABSTRACT:
An apparatus for flanging tubular articles of a thermoplastic polymer which has been drawn and heat-set to an elevated temperature comprises a heating die (20) shaped to receive an end of one of the tubular articles (10) and to restrain it from shrinkage, transfer means such as a star wheel (24) to transfer the article (10) from the heating die (20) to a forming die (22) shaped to form an outward flange (12) on said end. Heater coils (33,40) are provided to maintain the dies at the required temperatures; namely the heating die (20) at a softening temperature above the glass transition temperature of the polymer but below the elevated temperature to which it has been heat-set and the forming die (22) at a forming temperature below the softening temperature. Means, such as a pneumatic system (48,50,52) are provided to apply an end of one of the tubular articles (10) to the heating die (20) so that this end is softened whilst restrained from residual shrinkage by the heating die (20) and also for forcing the forming die (22) and the heat-softened end of the tubular article (10) together to form the outward flange (12). Once the flange (12) has been formed, it is cooled e.g. by cooling air whilst restrained against deformation by the forming die (22) to set the flange in accordance with well-defined dimensions.
REFERENCES:
patent: 2823418 (1958-02-01), Fritts
patent: 3359599 (1967-12-01), Martin et al.
patent: 4008028 (1977-02-01), Ronden et al.
patent: 4021286 (1977-05-01), Amberg
patent: 4308225 (1981-12-01), Magarian
patent: 4379115 (1983-04-01), Seach et al.
patent: 4559197 (1985-12-01), Dick et al.
patent: 4643658 (1987-02-01), Gordon
*Reference checked was cited by applicant on p. 1 of specification.
Chiesa Richard L.
CMB Packaging (UK) Limited
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