Process for thermoforming hollow articles

Details Process for thermoforming hollow articles Process for thermoforming hollow articles

1974-09-20

1977-07-05

Hoag, Willard E.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264313, 264322, B29C 1704, B29F 500

Patent

active

040340546

ABSTRACT:
There is disclosed a novel process for using a pressure box assembly associated with a thermoplastic thermoforming assembly. The pressure box assembly is provided with a diaphram formed of a resilient material, such as synthetic rubber and the like, disposed across the entrance into a cavity of the pressure box of the pressure box assembly.
The pressure box assembly is associated with thermoforming molding apparatus to cause a heat thermoplastic sheet or web to be drawn about a male mold provided on a male mold assembly during insertion of the male mold into the cavity in a hollow article of more uniform wall thickness.

REFERENCES:
patent: 2468697 (1949-04-01), Wiley
patent: 2648099 (1953-08-01), Dunmire
patent: 2962757 (1960-12-01), Slemmons et al.
patent: 3342915 (1967-09-01), Wanderer
patent: 3608055 (1971-09-01), Long

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