Envelopes – wrappers – and paperboard boxes – Envelope – Compartment
Patent
1989-04-27
1990-12-18
Garbe, Stephen P.
Envelopes, wrappers, and paperboard boxes
Envelope
Compartment
150146, 150147, 156251, 1562751, 1563807, 1563808, 383107, 383903, 493199, B65D 2700, B65D 2708
Patent
active
049780557
ABSTRACT:
A reinforcing weld structure for thermo-adhesive sheets joined by high frequency welding methods. The invention is particularly concerned with a photo finisher wallet fabricated of flexible thermoplastic sheet material and including the reinforcing weld of the present invention at each corner of each of the wallet's pockets. The photo finisher wallet includes a first flexible thermoplastic sheet foldable to form front and rear covers, one of which is substantially rectangular and has a welded seam along three of its edges. A second substantially rectangular thermoplastic sheet is sealed along its three edges to the rectangular cover by the seam, the second sheet having an unsealed edge to form a pocket. A reinforcing weld according to the present invention seals the sheets at each corner of the pocket, with the seam and the reinforcing welds having been formed by an upper electrode die of a high frequency welding press having a lower electrode platen with the sheets superposed on one another and interposed between the die and the platen. The die of the present invention includes a seam producing die surface for producing the seam, and widended die surface portions inwardly extending and downwardly inclined from the seam producing die surface for respectively overlying the pocket corners at their openings for producing the improved reinforcing weld.
REFERENCES:
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patent: 2956726 (1960-10-01), Pieronek et al.
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patent: 3435868 (1969-04-01), Stermer
patent: 4770295 (1988-09-01), Carveth et al.
Garbe Stephen P.
Rembrandt Photo Services
Weiss David
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