Tamper-evident closure with improved tear strip hold-down

Details Tamper-evident closure with improved tear strip hold-down Tamper-evident closure with improved tear strip hold-down

1990-08-24

1991-10-01

Marcus, Stephen

Receptacles

Closures

With closure opening arrangements for means

220266, 220339, 220359, 222153, 222541, B65D 1734

Patent

active

050525727

ABSTRACT:
The hinged flap of a plastic container closure is molded while in an open position and, during molding of the flap, an elongated tear-away strip is formed along the front edge of the flap and is integrally connected to the flap by tearable webs. After the newly molded flap has first been closed, the strip is anchored releasably to the top panel of the closure and prevents the flap from opening during shipment of the container, the strip also serving as a visual indicator that the seal of the closure is intact. Anchoring of the strip is effected by pins which project upwardly from the panel and which are ultrasonically welded to the lower side of the strip. The closure is opened by lifting and pulling on the strip to break the welds at the pins and thereby enable the strip to be torn completely away from the top panel and the flap and to free the flap for swinging to an open position. The absence of the strip or the presence of a partially torn strip indicates that tampering has occurred and that the seal may not be intact.

REFERENCES:
patent: 3675812 (1972-07-01), Foster
patent: 4361250 (1982-11-01), Foster
patent: 4434907 (1984-03-01), Ingemann
patent: 4463869 (1984-08-01), Lewis
patent: 4529100 (1985-07-01), Ingemann
patent: 4592480 (1986-06-01), Hart et al.
patent: 4610371 (1986-09-01), Karkiewicz
patent: 4621744 (1986-11-01), Foster
patent: 4640427 (1987-02-01), Marino et al.
patent: 4658980 (1987-04-01), Lindstrom

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