Easy-to-straight-tear plastic film, and its production method and apparatus

A method for producing a long, easy-to-straight-tear plastic film having large numbers of substantially parallel half-cut lines extending in a transverse direction on at least one surface, comprising the steps of (1) arranging a roll having at least one cam axially extending on a circular surface of said roll, and a cutter parallel to said roll, with a gap narrower than the thickness of said plastic film, (2) moving said plastic film between said roll and said cutter in a direction perpendicular to the axial direction of said roll, and (3) rotating said roll so that said cam intermittently pushes said plastic film to said cutter to form half-cut lines on said plastic film.

An apparatus for producing a long, easy-to-straight-tear plastic film having large numbers of substantially parallel half-cut lines extending in a transverse direction on at least one surface, comprising (a) a roll having at least one cam axially extending on a circular surface of said roll, and (b) a cutter arranged in parallel to said roll with a gap narrower than the thickness of said plastic film, said plastic film moving between said roll and said cutter in a direction perpendicular to the axial direction of said roll, the rotation of said roll causing said cam to intermittently push said plastic film to said cutter to form half-cut lines on said plastic film.