Patent
1978-08-03
1980-02-26
Culver, Horace M.
93 3601, 93 53R, 93 53M, B65B 102
Patent
active
041899865
ABSTRACT:
Method and apparatus for the forming, sealing and closing of packages utilizing blanks created from fiberboard substratum to which sheeting having thermoplastic characteristics is laminated by a moisture-resistant heat-weakenable substance, such as microcrystalline wax. A tubular blank having an interior sheeting lining is first formed from the flat blank, as by forming a fin-type side seam which may be located in one body wall. The end closure is formed by panels hinged to each of the four body walls, with one of these panels serving as the main closure panel and being of sufficient size to overlie the entire end opening. A pair of gusset panels flank the main panel and a short flange panel is hinged to the opposite, parallel body wall. After outfolding the gussets and the flange panel, a continuous membrane seal is created along the three edges of the end opening by heat-sealing the sheeting associated with these panels. Delamination is effected during this heat-sealing, and after infolding the gussets and the flange panel, the main closure panel is secured in overlying position as by a hot melt adhesive.
REFERENCES:
patent: 3411694 (1968-11-01), Silver
patent: 3516336 (1970-06-01), Maulini
patent: 3577699 (1971-05-01), Silver
Culver Horace M.
Paxall Inc.
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