Double-bag package and perforation knife

Details Double-bag package and perforation knife Double-bag package and perforation knife

2005-08-30

2005-08-30

Sipos, John (Department: 3721)

Package making

Methods

Forming a cover adjunct or application of a cover adjunct to...

C053S451000, C053S131500, C053S551000

Reexamination Certificate

active

06935086

ABSTRACT:
A double-bag package, and method for manufacturing same, constructed by modification to existing vertical form and fill packaging machines and perforation knives. In a preferred embodiment, the invention involves producing a double-bag package from a single sheet of packaging film by feeding a roll of film having graphics printed sideways rather than vertically into a vertical form, fill and seal packaging machine and using a novel perforating/cutting knife to alternately cut and perforate transverse seals. The perforating/cutting knife has teeth in the shape of oblique triangular pyramids, with each tooth having three cutting edges. The perforating/cutting knife produces self-correcting T-shaped perforation patterns capable of capturing and redirecting errant tears for fail-safe directional separation.

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“Votocel-Filmes Flexiveis Ltd—Biaxially Oriented Polyproplyene Film (BOPP) for Flexible Packaging,” posted by Votocel-Filmes Flexivels Ltd, Volorantim, Brazil, at http://www.packaging-technology.com/contractors/materials/votocel/, printed on Oct. 8, 2003.
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“High Technology, Quality, Durable, Designed for 24-hour Operation,” posted by Mega Pack S.A. at http://www.megapack.gr/mixanimatauk.html, printed on Nov. 18, 2003.

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