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US 7,070,729 B2Granted
Pressware die set with product ejectors at outer forming surfaces
AssigneeFort James Corporation
InventorsAlbert D. Johns, Mark B. Littlejohn, Thomas W. Zelinski
Life of this patent
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Abstract
An improved pressware die set includes mechanical ejectors for removing formed product from the punch. A preferred embodiment includes rocker-style ejectors free from edges or other asperities which may tend to snag and mar the product during the production process. Most preferably, the outward surfaces of the rocker members extend beyond the perimeter of a paperboard blank positioned for forming so the paperboard blank does not encounter an obstruent outward edge during forming.
Claims13
A method of making a pressed a paperboard container comprising:
- (a) positioning a paperboard blank in a pressware die set in an open position, the die set having a punch and die each of which has substantially planar central portions and outer portions corresponding to like portions of the formed container wherein the punch is provided with a plurality of mechanical product ejectors disposed at its outer portions, each of which product ejectors include (i) a movable ejector member defining an ejector surface and (ii) biasing means;
- (b) closing the die set to press the paperboard blank into the container, the forming surfaces at the outer portion of the punch corresponding to a sidewall portion, an intermediate portion and a flange portion of the container;
- and
- (c) opening the die set, whereupon the biasing means urge the ejector surfaces to project from the forming surfaces of the outer portion of the punch in order to eject the formed container therefrom,
- wherein the plurality of mechanical ejectors include a plurality of rocker members ejectors, pivotally mounted at an outer portion of the punch.
2 more elements
Dependencies are inferred from the claim text.