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US 4,534,725 AGranted
Apparatus for manufacturing ovenable paperboard articles
AssigneeInternational Paper Company
InventorsDonald J. Hemmelgarn, Arthur L. Grow
Life of this patent
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Abstract
A method and apparatus are disclosed for imparting a desired shape to a paperboard blank. The blank is formed between two dies for a sufficient length of time and with sufficient force to set the form, while moving the dies in tandem along a predetermined portion of a reciprocation path. Because the formed blank remains in dwell while the dies are moving in tandem, it is not necessary to hold the dies stationary to ensure permanent formation of the blank. This allows greater production speeds.
Claims19
A system for forming a web material into a finished product of a desired shape, said system comprising:
- first and second dies for cooperating to press a blank between them to form the blank;
- reciprocating means for reciprocating said first die along a reciprocation path having a first portion in which said first die is out of contact with said blank and said second die, a second portion in which said first die is in contact with said blank and in partial operative engagement with said second die, and a third portion in which said first die is in full operative engagement with said second die with said blank between said dies;
- and
- reciprocating support means for said second die for reciprocating said second die along with said first die while maintaining said second die in full operative engagement with said first die, with a blank between said dies, while said reciprocating means for said first die is moving said first die along said third portion of the reciprocation path of said first die, for maintaining the blank in dwell between said dies with sufficient pressure for forming, while said dies move along said third portion of said reciprocation path.
1 more element
Dependencies are inferred from the claim text.