Apparatus for piercing slits in plastic sheet material

Details Apparatus for piercing slits in plastic sheet material Apparatus for piercing slits in plastic sheet material

1992-07-27

1993-08-03

Kisliuk, Bruce M.

Manufacturing container or tube from paper; or other manufacturi

With cutting, breaking, tearing, or abrading

Including application of heat

493194, 493238, 493372, 493468, 83620, 83660, 83695, B31B 114

Patent

active

052324303

ABSTRACT:
A piercing blade for perforating slits in a continuous tubular web of thermo-plastic material is shown. The blade is used in a machine to form individual bags from the tube by heat sealing the bottom and perforating the top of the next bag. The piercing teeth in the blade have formed in the front face a number of horizontal grooves which serve to pick up the edge of the top layer of the slit to form a burr thereon and thus separate the two plys of the tubular web, facilitating the opening of the top of the bag when it is separated from the roll of continuous tubular material.

REFERENCES:
patent: 3795163 (1974-03-01), Armstrong
patent: 3824887 (1974-07-01), Marchard
patent: 3841189 (1974-10-01), Spengler
patent: 3866491 (1975-02-01), Marchard
patent: 4132138 (1979-01-01), Miyamoto
patent: 4176567 (1979-12-01), Weisberg
patent: 4358979 (1982-11-01), Kurzbuch
patent: 4768411 (1988-09-01), Su
patent: 4852442 (1989-08-01), Pottorff
patent: 5001956 (1991-03-01), Nitsch
patent: 5064408 (1991-11-01), Bridgeman

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