Equipment for thermoforming polypropylene bands

Details Equipment for thermoforming polypropylene bands Equipment for thermoforming polypropylene bands

1990-12-20

1992-08-04

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Preform reshaping or resizing means: or vulcanizing means...

Including shaping means comprising fluid pressure contacting...

425394, 425397, 425398, 4254031, B29C 5100

Patent

active

051353830

ABSTRACT:
An apparatus for thermoforming a polypropylene band by heating plates located upstream of a pressing station where transverse rows of blisters are made on a band by a die. A striker device is located at the outlet of the pressing station and is operated in phase relationship with the advancement of the band, after every pressing stage. A plurality of pins, which are borne by a movable bar, are moved towards the band to intercept, when the die is closed, a transverse row of blisters of the band, and to prevent any sliding of a portion of the band still to be formed.

REFERENCES:
patent: 3518334 (1970-06-01), Carrigan et al.
patent: 4009981 (1977-03-01), Rosen
patent: 4105386 (1978-08-01), Thiel et al.
patent: 4360491 (1982-11-01), Holden, Jr.
patent: 4758145 (1988-07-01), Hautemont
patent: 4844852 (1989-07-01), Keyser et al.

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