Method of and apparatus for measuring and controlling blow-up of

Details Method of and apparatus for measuring and controlling blow-up of Method of and apparatus for measuring and controlling blow-up of

1988-08-15

1990-01-30

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

264 406, 264 407, 264321, 425141, 425143, 425145, B29C 5142, B29C 5146, B29C 6720

Patent

active

048972304

ABSTRACT:
A method and an apparatus for measuring and controlling foam sheet blow-up in a thermoformer oven. Control of the oven operation is achieved through monitoring the measured blow-up of a material in the thermoformer oven at a sensing location in a forming station receiving the material from the over in order to regulate the thickness of the plastic material prior to its conveyance into said forming station. This is effected by varying the rate of advance and dwelling time of the material in the oven, and optionally, also concurrently regulating the temperature in the oven to optimize control over material blow-up.

REFERENCES:
patent: 4376085 (1983-03-01), Burry
patent: 4382761 (1983-05-01), Daubenbuchel et al.
patent: 4412961 (1983-11-01), DiBiasi et al.
patent: 4438054 (1984-03-01), Holden
patent: 4454082 (1984-06-01), Cisar et al.
patent: 4505158 (1985-03-01), Maples
patent: 4832885 (1989-05-01), Gross

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