The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 11, 1983
Filed:
Dec. 15, 1980
Harold K Fox, Minneapolis, MN (US);
Bemis Company, Inc., Minneapolis, MN (US);
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.