Method of forming blisters

Details Method of forming blisters Method of forming blisters

1991-08-15

1993-03-09

Hoag, Willard

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Production of continuous or running length

264553, 264554, 264571, B29C 5106, B29C 5110

Patent

active

051924846

ABSTRACT:
A method of and for forming blisters in which a web material including a thermoplastic resin that is supplied to a rotary forming drum is heated and deformed by heat in accordance with the configuration of cavities provided on the rotary forming drum. A predetermined tension is applied to the web material while feeding it. When the rotary forming drum consists of a polygonal drum, each peripheral surface of the drum is formed as a curved surface extending along an arc whose radius is larger than that of the circumscribed circle of the polygon. This invention can be used in a packing device for foods, drugs, etc.

REFERENCES:
patent: 2905969 (1959-09-01), Gilbert et al.
patent: 3350484 (1967-10-01), Magill, Jr.
patent: 4259286 (1981-03-01), Louis et al.
patent: 4375146 (1983-03-01), Chung
patent: 4384441 (1983-05-01), Maruyama et al.
patent: 4494361 (1985-01-01), Barathon et al.
patent: 4571924 (1986-02-01), Bahrani
patent: 4656811 (1987-04-01), Dedolph
patent: 4750318 (1988-06-01), Matsuzawa

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