Package making – Apparatus for contraction of cover by stretching or shrinking – By heat shrinking
Patent
1983-12-05
1985-12-03
Sprull, Robert L.
Package making
Apparatus for contraction of cover by stretching or shrinking
By heat shrinking
53229, B65B 5306, B65B 1148
Patent
active
045558957
ABSTRACT:
This invention relates to a machine (10) for packaging products in heat-shrinkable film, of the so-called bundling machine type, in which the film (65) fed from opposing reels (67) and (68) is made to pass over a product support platform (17) which is lowered into a vertically extending chamber (13) comprising at its top an aperture (16) which can be closed alternately by said support platform (17) and by a lateral panel (18) which is mobile horizontally when said platform (17) is in its lowered position.
Within said chamber (13) there are positioned film welding means (51) and (52) and means (19) and (20) for heating the film when wrapped and welded about the product (66) in order to cause its heat-shrinkage. Furthermore, in a position corresponding with said aperture (16) of the chamber (13), means (80) are provided for lifting the film into a position above said support platform (17) when this latter has been raised in order to close the chamber (13) and carries the finished package (102).
REFERENCES:
patent: 3777446 (1973-12-01), Graver
patent: 3853218 (1974-12-01), Grasvall
patent: 3933569 (1976-01-01), Grasvoll
patent: 3994114 (1976-11-01), Nishimura
patent: 4162604 (1979-07-01), Bartolomei
Mudd Richard M.
Sprull Robert L.
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