Package making – Apparatus for contraction of cover by stretching or shrinking
Patent
1993-11-24
1995-01-24
Johnson, Linda B.
Package making
Apparatus for contraction of cover by stretching or shrinking
533892, 294902, 403 19, 403255, 414753, B65B 5300, B65B 4112
Patent
active
053833260
ABSTRACT:
Gripper pads for a gripping device such as that found in a stretch wrap packaging machine are provided with means enabling their simple installation and mechanical attachment to the fingers of a film gripping unit without necessitating the removal of the gripper unit from the machine. Each pad includes a film-contacting surface which is essentially unaffected chemically by plasticizers found in the common stretch films employed in this field. The film-contacting surface is one which is compressible but also has a fast recovery for returning to its original uncompressed condition to accommodate relatively high speed wrapping. Laminated to the film-contacting surface is a solid urethane or comparable material which has strength capabilities enabling the formation of stems or runners on the side opposite the film-contacting surface so that the stems can be threaded through openings in the fingers and used as pulling tools to anchor heads connected to the stems to be anchored in the fingers. The need for removal of the film gripping device, scraping the old cemented pads from the fingers, cementing new pads in their place and reinstalling the same or another film gripping assembly in the machine is thus obviated.
REFERENCES:
patent: 3856246 (1974-12-01), Sinko
patent: 4501106 (1985-02-01), Treiber et al.
patent: 4693362 (1987-09-01), Kemmerer et al.
Dean Ralph T.
Valentine Richard D.
Johnson Linda B.
Premark FEG Corporation
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