Method and mold for making an improved egg carton

Details Method and mold for making an improved egg carton Method and mold for making an improved egg carton

1983-09-12

1984-08-07

Ross, Herbert F.

Envelopes, wrappers, and paperboard boxes

Wrapper

Bottle

229 25EC, 229 45EC, B65D 566, B65D 124

Patent

active

044638949

ABSTRACT:
An inwardly offset surface of the cover of a carton is cut in a plane transverse to the top of the cover. A protrusion on the bottom surface of a complementary recess in the latch flap extends through the hole to latch the carton with the protrusion being within the cover recess to prevent accidental opening of the carton. The mold for producing the carton cuts the hole while thermoforming by relative movement between a male key mounted in the male mold member and female key mounted in the female mold member. Both keys have flat surfaces transverse to the closing motion of the molds. These flat surfaces are biased into engagement one with the other so that the plastic is cut in a shearing action.

REFERENCES:
patent: 2990094 (1961-06-01), Reifers
patent: 3215326 (1965-11-01), Despres
patent: 3215327 (1965-11-01), Crabtree
patent: 3259294 (1966-07-01), Hartmann
patent: 3398875 (1968-08-01), Snow
patent: 3458108 (1969-07-01), Hawarth
patent: 3648916 (1972-03-01), Commisso
patent: 3687355 (1972-08-01), Dahlberg
patent: 3845187 (1972-09-01), Dahlberg
patent: 3862817 (1975-01-01), Dahlberg
patent: 4108941 (1978-08-01), Kermoian
patent: 4142848 (1979-03-01), Irwin
patent: 4143111 (1979-03-01), Irwin
patent: 4194682 (1980-03-01), Congleton

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