Package making – Methods – Closing package or filled receptacle
Patent
1980-12-15
1983-01-11
Culver, Horace M.
Package making
Methods
Closing package or filled receptacle
53481, 53373, 156286, B65B 706, B65B 5110
Patent
active
043676200
ABSTRACT:
A vacuum heater head is provided for sealing the valve of a bag after the bag has been filled through the valve. The head has a generally planar surface with a plurality of spaced recesses opening therethrough, passages being provided in the head to open to the recesses for applying a vacuum therethrough. In two of the embodiments shown, the valve in a bag filled condition has a first wall that at least in part has an exposed exterior wall portion of a relatively high porosity and a second wall having a wall portion in juxtaposed relationship to the exposed wall. The first wall portion may be of paper and the second wall portion of a thermoplastic material, for example polyethylene, or the second of paper or non-thermoplastic with, for example, hot melt adhesive between the wall portions. Upon pressing the bottom surface of the heated vacuumized head against the exposed exterior surface the second wall is drawn against the first wall portion to be adhered thereto to form a seal across at least substantially the entire transverse width of the valve. In another embodiment a generally flat valve member is likewise adhered to the adjacent side closure flap portions to form a sealed valve closure.
REFERENCES:
patent: 2292295 (1942-08-01), Royal
patent: 2419991 (1947-05-01), Dunning
patent: 2423237 (1947-07-01), Haslacher
patent: 2435878 (1948-02-01), Dunning
patent: 2496336 (1950-02-01), Cupo
patent: 2672268 (1954-03-01), Bower
patent: 3411695 (1968-11-01), Cupo
patent: 3551232 (1970-12-01), Thompson
patent: 3764443 (1973-10-01), Christensson
patent: 3914917 (1975-10-01), Young
Bemis Company Inc.
Culver Horace M.
Johnson Clayton R.
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