Method for thermoforming

Details Method for thermoforming Method for thermoforming

2006-04-25

2006-04-25

Lee, Edmund H. (Department: 1732)

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Starting material is nonhollow planar finite length preform...

C264S550000, C264S551000

Reexamination Certificate

active

07033536

ABSTRACT:
A method and apparatus for thermoforming deep drawn parts such as cups in which a vacuum is momentarily applied to a preheated sheet material when overlying a clamping plate prior to clamping and advance of the plug assists to delay contact with a lip molding feature projecting from each mold cavity. This avoids a molding defect due to premature cooling of a localized region of the sheet material when the sheet material comes into contact with the lip molding features.

REFERENCES:
patent: 3342914 (1967-09-01), Edwards
patent: 3441983 (1969-05-01), Cheney
patent: 3450807 (1969-06-01), Cheney
patent: 3814784 (1974-06-01), Wolf
patent: 4010230 (1977-03-01), Repenning
patent: 4443401 (1984-04-01), Turner
patent: 4582665 (1986-04-01), Jabarin
patent: 5641524 (1997-06-01), Rush et al.
patent: 02147317 (1990-06-01), None

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