Importance

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Abstract

A porous film manufacturing apparatus is disclosed, which can continuously and uniformly form a large number of uniform through pores or blind pores, each having a size arbitrarily selected in the range of sub-.mu.m to several tens .mu.m, in an elongated film made of various types of materials, such as polymeric materials and metals, at a high density (e.g., 5,000 to 200,000 per cm.sup.2), without almost any deterioration in essential characteristics of the film materials. The manufacturing apparatus includes a feeder for feeding an elongated film, a perforating unit including a first rotatable roll having a surface on which a large number of particles, each having acute corner portions and a Mohs hardness value of not less than 5, are deposited, and a second roll which is rotatable in a direction reverse to a rotating direction of the first roll, the first and second rolls being arranged to oppose each other and to cause the elongated film to pass therebetween, one of the rolls being stationary, and the other roll being movable in a direction to oppose the one roll, and a pressure controller, arranged near two end portions of the movable roll of the unit, for controlling a pressure applied from each of the rolls to the film.

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First Claim