Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – Making hole or aperture in article
Patent
1973-08-17
1976-04-13
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
Making hole or aperture in article
229 25EC, 229 44R, 229 45EC, 264321, B29C 1704, B29C 1710, B29D 2700
Patent
active
039502082
ABSTRACT:
A foamed plastic sheet is perforated medially before it is heated in an oven following which, it is conveyed between a pair of matching molds where a quad of egg cartons is formed in an upside down condition with locking lugs of a pair of cartons on one side of the perforated line facing the lugs of the other pair across the perforated line. Perforation of the sheet is made to relieve stress in the region where the lugs are formed.
REFERENCES:
patent: 3326443 (1967-06-01), Burkett
patent: 3475526 (1969-10-01), Seto
patent: 3519189 (1970-07-01), Bambara et al.
patent: 3572578 (1971-03-01), Rohdin
patent: 3640668 (1972-02-01), Brown et al.
patent: 3651976 (1972-03-01), Chadbourne
patent: 3670952 (1972-06-01), Venuti et al.
Feinstein Sumner Sheldon
Pavuk Frank Eugene
Steiner Roger Henry
Venuti Richard Joseph
Anderson Philip
Borden Inc.
Kap George A.
Maskas George P.
Mast Daniel D.
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