White opaque opp film for tamper evident package

Details White opaque opp film for tamper evident package White opaque opp film for tamper evident package

1989-06-14

1990-06-05

Robinson, Ellis P.

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

206807, 383 5, 428 341, 428 357, 428 364, 428212, 428213, 4283155, 4283157, 4283166, 4283179, 428349, 428407, 428516, B32B 326, B32B 700, B65D 6538

Patent

active

049313274

ABSTRACT:
A tamper-evident film includes a hydrocarbon polymer core layer (a) having an upper face and a lower face; an oriented tamper-evident layer applied to at least the lower face of core layer (a), layer (b) being fabricated from a mixture of a polyolefin and a filler of particles which induce cavitation upon orientation, layer (b) having an internal cohesiveness which is less than the internal cohesiveness and bonding strength of packaging adhesives and heat seals; and, an oriented skin layer (c) applied to the upper face of core layer (a) if layer (b) has not been applied thereon, layer (c) being hydrocarbon polymer. A tamper-evident package seal and package are also provided.

REFERENCES:
patent: 4121003 (1978-10-01), Williams
patent: 4377616 (1983-03-01), Ashcraft et al.
patent: 4429015 (1984-01-01), Sheptalk
patent: 4488646 (1984-12-01), McCorkle
patent: 4509196 (1985-04-01), Sah et al.
patent: 4510621 (1985-04-01), Sak et al.
patent: 4557505 (1985-12-01), Schaefer et al.
patent: 4582736 (1986-04-01), Duncan
patent: 4632869 (1986-12-01), Park et al.
patent: 4652473 (1987-03-01), Han
patent: 4701370 (1987-10-01), Park
patent: 4702954 (1987-10-01), Duncan
patent: 4709396 (1987-01-01), Voshall et al.
patent: 4760919 (1988-08-01), Pereyra
patent: 4876123 (1989-10-01), Rivera et al.

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