Paper cup bottoms and method and apparatus for forming same

Details Paper cup bottoms and method and apparatus for forming same Paper cup bottoms and method and apparatus for forming same

1999-02-17

2000-10-24

Gerrity, Stephen F.

Manufacturing container or tube from paper; or other manufacturi

Container making

Rigid container

493108, 493167, 493175, 72337, 72338, B31B 190

Patent

active

06135936&

ABSTRACT:
A bottom for a paper cup is formed by advancing a punch against a paperboard web to push the web against a cutting edge which cuts out a circular cup bottom blank from the web. The punch is kept in a forward state to clamp an outer peripheral portion of the blank immovably against a surface of a sleeve. A reciprocable draw is advanced against a center portion of the blank to push the center portion into a circular opening of the sleeve while maintaining the clamping force, to cause the center portion of the blank to become stretched. The clamping force is then progressively released to permit the outer peripheral portion to enter the opening and become bent to form a lip extending at a substantially right angle. The lip is compressed within a gap formed between the draw and a surface of the opening. Because of the stretching of the blank, pleats formed in the lip are only in the form of micropleats that are flattened in a non-folded over state.

REFERENCES:
patent: 3118351 (1964-01-01), Jagenberg
patent: 4599123 (1986-07-01), Christensson
patent: 4619636 (1986-10-01), Bogren
patent: 4865506 (1989-09-01), Kaminski
patent: 5449337 (1995-09-01), Konzal
patent: 5624367 (1997-04-01), Bedziszewski

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