Production method and production device of film having fine irregular pattern on surface

A production method for a film having a fine asperity pattern on a surface thereof, comprising:

• (1-a) supplying a processing film composed of a thermoplastic resin as a main component in a film supply step in which said processing film taken out from a long film strip supply source provided on an upstream side is supplied intermittently in the lengthwise direction of the film with a predetermined length onto a mold surface having a fine asperity pattern having a roughness height in the range of 10 nm to 1 mm,
• (1-b) forming a pattern in a pattern forming step in which said processing film supplied onto said mold surface in said film supply step is pressed against said mold surface so that said pattern on said mold surface is transferred to a surface of said processing film to form a fine asperity pattern on the surface of said processing film,
• (1-c) peeling the film in a film peeling step in which a processed film having said pattern formed on its surface in said pattern forming step is peeled off from said mold surface, and
• (1-d) delivering the film in a film delivery step in which said processed film peeled off from said mold surface in said film peeling step is delivered to a long film strip storage source provided on a downstream side,
• thus processing the film in said pattern forming step to produce said processed film, peeling it off from said mold surface in said film peeling step, and then delivering said processed film to said film storage source in said film delivery step while another predetermined length of said processing film to be processed next is supplied intermittently onto said mold surface, in order to perform repeated production of said processed film with a predetermined length at a time, wherein
• (1-e) the peeling of said processed film in said film peeling step is achieved by a film holding means that holds said processed film and moves along said mold surface from the downstream side toward the upstream side in the length direction of said processed film, and
• (1-f) the supply of said processing film in said film supply step is achieved as a crease formation prevention means to prevent creases from forming on said processing film supplied onto said mold surface moves from the upstream side toward the downstream side in the length direction of said processed film.