Paxall, Inc.

Stanley Milton Silver

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.

Method and apparatus for heat sealing a package blank

A blank which is capable of producing a tube of moisture-resistant material which may be end sealed to form a package. The blank comprises a substratum of card or the like with a delaminable sheeting thereon. The blank has fold lines defining opposable body walls and at least one end closure panel. Flange panels are defined with extensions and allow the formation of a sealable fin. Apparatus and method are provided for side seaming such a blank with outfolding of panels to fuse the sheeting into a tube and delaminate the sheeting from the substratum. Apparatus and method are also provided for end sealing such a tube, with provision for outfolding of gussets and fusion and delamination of the sheeting to provide an end membrane delaminated from the substratum.

Packaging

Laminated blanks for forming moisture-resistant packages are produced from a substrate, such as cardboard. A continuous web of substrate is perforated and fold lines formed. Perforated regions are stripped therefrom prior to laminating with moisture-resistant heat-sealable sheeting using a heat-weakenable laminating material. Thereafter, a multitude of rows of individual blanks are profiled by die-cutting the laminated web. The blanks have unsupported sheeting regions disposed along an edge portion of the substrate which provide membranes or webs that are adapted for sealing to another portion of the laminated sheeting to form a continuous barrier that may be used to prevent wicking in an erected package.

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London, United Kingdom

Stanley Milton Silver