Apparatus for producing easy-to-tear plastic film

An apparatus for producing an easy-to-tear plastic film randomly having pluralities of unpenetrating fine pores on an entire surface of a plastic film, comprising

• a first roll rotatably supported by a pair of laterally arranged stationary frames;
• a second roll movable up and down along a pair of laterally arranged movable frames, such that said second roll comes into contact with said first roll via a plastic film;
• rolls for passing said plastic film through a gap between said first and second rolls;
• a first motor for rotating the pair of said movable frames;
• second motors each mounted to each of said movable frames to move said second roll up and down;
• a third motor for rotating said first roll;
• and
• a fourth motor for rotating said second roll;
• one of said first and second rolls being a pattern roll randomly having pluralities of high-hardness, fine particles on its rolling surface, and the other being an anvil roll having a flat rolling surface;
• the high-hardness, fine particles projecting from a rolling surface of said pattern roll having such average height and maximum height as to enable the formation of unpenetrating fine pores having an average depth corresponding to 30-80% of the thickness of said plastic film and the maximum depth corresponding to 90% or less of the thickness of said plastic film, in said plastic film;
• and
• with the center axis of said second roll inclined to the center axis of said first roll in a horizontal plane by the operation of said first motor, said plastic film passing through a gap between said first and second rolls, thereby forming pluralities of unpenetrating fine pores transversely uniformly in said plastic film by said high-hardness, fine particles.