Apparatus for producing microporous plastic film

An apparatus for producing a microporous 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 roll and said second roll;
• a first motor for rotating HA the pair of said movable frames;
• second motor 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;
• and
• in a state where the center axis of said second roll is 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 roll and said second roll, so that said high-hardness, fine particles form pluralities of fine pores in said plastic film.