Manufacturing container or tube from paper; or other manufacturi – Container making – Pliable container
Patent
1989-12-27
1991-07-09
Terrell, William E.
Manufacturing container or tube from paper; or other manufacturi
Container making
Pliable container
493233, 493267, 493923, 493930, 206610, 206807, 383 84, B31B 1974, B31B 1990
Patent
active
050301896
ABSTRACT:
Method for forming an envelope having a tear strip or a tear-off flap portion for aiding in opening the envelope, comprising the steps of providing an envelope blank formed of a material capable of being weakened by the application of ultrasonic frequencies, forming the blank into a finished envelope, and applying ultrasonic energy to the finished envelope to form either a pair of closely-spaced, elongate distress lines or a single, straight distress line at which the fibers forming the material are weakened, thus defining a tear strip or a tear-off flap portion capable of manual separation form the remainder of the envelope. An envelope formed according to the above method comprises a body portion having a front panel, a back panel, and a seal flap extending outwardly from and formed integrally with a side of the front panel. The flap has a pair of closely-spaced, elongate distress lines or a single, elongate distress line extending transversely of the flap at which the fibers forming the material are weakened, the distress lines being formed by the application of an ultrasonic frequency and defining a tear strip or a tear-off portion capable of manual separation form the remainder of the flap. The distress lines forming the tear strip can be straight or serpentine. The distress line forming the tear-off portion is straight.
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Data Sheet PW-31 of Branson Sonic Power Company.
Data Sheet FF-2 of Branson Sonic Power Company.
National Services Industries, Inc.
Terrell William E.
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