Composite paperboard and polymer package

Details Composite paperboard and polymer package Composite paperboard and polymer package

1989-09-22

1991-04-23

Seidleck, James J.

Stock material or miscellaneous articles

Hollow or container type article

Paper containing

220339, 229 31, 229902, 264511, 264515, 264516, 426115, B65D 556

Patent

active

050099396

ABSTRACT:
The vessel portion of a gas-tight container suitable for packaging fresh foods is produced as a composite of paperboard and polymer film. A pair of folded paperboard blanks, pre-cut and pre-formed, are inserted into the opposite halves of split mold elements to a blow molding machine. Vacuum orifices in each mold half unit temporarily secure the position of a respective paperboard blank. The paperboard lined mold halves are closed upon a hot, extruded parison of malleable polymer leaving an end portion of the parison tube projecting from the closed mold unit. A fluid conducting needle penetrates this projected end portion to inflate the parison with an appropriate blowing gas. Such inflation expands the malleable polymer, seamlessly and creaselessly, into the internal corners and crevices of the folded paperboard blanks. Following chilling, the mold unit is opened and the pair of paperboard flanks are ejected as a singular unit, joined by a molded flange portion of the continuous polymer film. Finally, the two polymer coated paperboard vessels are separated by trimming about the flange.

REFERENCES:
patent: 4026458 (1977-05-01), Morris et al.
patent: 4551366 (1985-11-01), Maruhashi et al.
patent: 4595611 (1986-06-01), Quick et al.
patent: 4618090 (1986-10-01), Cortellucci
patent: 4795665 (1989-01-01), Lancaster et al.
patent: 4844330 (1989-07-01), Roosa et al.

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