Package making – Methods – Forming a cover adjunct or application of a cover adjunct to...
Patent
1996-07-10
1999-02-16
Culver, Horace M.
Package making
Methods
Forming a cover adjunct or application of a cover adjunct to...
53451, 53474, 53554, 533742, 493391, 493931, 156205, 156208, 156581, B65B 902, B65B 920, B65B 4306
Patent
active
058708847
ABSTRACT:
A multiple compartment package having a connecting bridge with a frangible internal barrier is made from two composite or thermoplastic sheets or webs welded together to form the front and back walls of the package, and the central bridge portion is defined by one or more partitions spanning the short distance between the webs. In the preferred embodiment, multiple partitions form a plurality of parallel compartment strips to create an obstruction to penetration of substances from one packet to the other. One process for making the invention uses a comb-shaped mask and a thermoplastic insert strip interwoven between the tines of the comb. The tines are extended down between the welding heads of the packaging machine, preventing welding from taking place between the thermoplastic sheets wherever the comb mash is, with the result that the welding occurs between the strip and an alternating one of the side webs creating a zig-zag pattern that forms the vacant barrier compartments. In a significant modification, this physical mask is replaced by mask coatings printed onto both sides of the strip, or printed on the webs rather than the strip, to cause the same localized compartment-forming welding failure as the physical comb mask. The perimeter seal of a single or multiple package can be provided with a preferred rupture point using the same techniques.
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