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POLYMER RESIN FILM, AND AIR PERMEABLE FILM, SOUND PERMEABLE FILM, ACOUSTIC RESISTOR, AIR PERMEABLE FILM MEMBER, SOUND PERMEABLE FILM MEMBER, ACOUSTIC RESISTOR MEMBER, AND ACOUSTIC EQUIPMENT PROVIDED WITH SAID POLYMER RESIN FILM, AND METHOD FOR MANUFACTURING POLYMER RESIN FILM
POLYMER RESIN FILM, AND AIR PERMEABLE FILM, SOUND PERMEABLE FILM, ACOUSTIC RESISTOR, AIR PERMEABLE FILM MEMBER, SOUND PERMEABLE FILM MEMBER, ACOUSTIC RESISTOR MEMBER, AND ACOUSTIC EQUIPMENT PROVIDED WITH SAID POLYMER RESIN FILM, AND METHOD FOR MANUFACTURING POLYMER RESIN FILM
A polymer resin film of the present disclosure has a plurality of through holes extending through the thickness of the polymer resin film. The through holes penetrate a substrate structure of the resin film. The through holes have openings formed in both a first principal surface and a second principal surface of the film. The through holes have a shape in which the area of a cross-section perpendicular to a direction in which the through holes extend is constant from the first principal surface of the film to the second principal surface of the film or increases from the first principal surface toward the second principal surface. The openings in the first principal surface have a diameter of 3 µm or more and 80 µm or less. A variation in a porosity defined by the openings in the first principal surface is 10% or less. A variation in the density (number/cm2) of the openings in the first principal surface is 1000 openings/cm2 or less. The polymer resin film of the present disclosure is a polymer membrane having air permeability through its thickness, and unevenness of the air permeability in the polymer resin film is smaller than in conventional membranes.
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机译:本公开的聚合物树脂膜具有多个贯穿聚合物树脂膜的厚度延伸的通孔。通孔穿透树脂膜的基板结构。通孔具有在膜的第一主表面和第二主表面两者中形成的开口。通孔具有这样的形状,其中,与通孔延伸的方向垂直的横截面的面积从膜的第一主表面到膜的第二主表面是恒定的,或者从第一主表面增大。朝向第二主表面。第一主表面中的开口的直径为3μm以上且80μm以下。由第一主表面中的开口限定的孔隙率的变化为10%或更小。第一主表面中的开口的密度(数量/ cm 2 Sup>)的变化为1000个开口/ cm 2 Sup>以下。本公开的聚合物树脂膜是通过其厚度具有透气性的聚合物膜,并且与常规膜相比,该聚合物树脂膜中的透气性不均较小。
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