Method and apparatus for manufacturing laminated film

Abstract

To form a coating layer having an even thickness on a laminated film.SOLUTION: A method for manufacturing a laminated film includes: a first drawing step 14 of drawing a porous substrate layer 101 in a first direction; a coating step of forming a coating layer 102 on a first drawing layer 101 acquired in the first drawing step 14 using an inkjet discharge device 20; and a second drawing step 16 of drawing the first drawing layer 101 on which the coating layer 102 is formed, in a second direction orthogonal to the first direction.SELECTED DRAWING: Figure 1

Claims

[Claim 1] A method for manufacturing a laminated film having a coating layer on a porous substrate layer made of a resin composition containing a thermoplastic resin and a filler, A first stretching step involves stretching a cast film layer obtained by extruding the resin composition in a first direction, A coating step is performed to form a coating layer of uniform thickness on the first stretched layer using an inkjet ejection device having a plurality of ink ejection ports for applying a coating liquid, which are formed over the entire width of the first stretched layer obtained in the first stretching step, A second stretching step is to stretch the first stretched layer on which the coating layer is formed in a second direction perpendicular to the first direction. A method for manufacturing a laminated film, characterized by comprising the following features. [Claim 2] In the first stretching step, the cast film layer is stretched in the first direction by a longitudinal stretching device. In the second stretching step, the first stretched layer is stretched in the second direction by a transverse stretching device. The inkjet ejection device is positioned downstream of the longitudinal stretching device and upstream of the transverse stretching device in the transport direction of the cast film layer. A method for manufacturing a laminated film according to feature 1. [Claim 3] The aforementioned coating layer excludes the coating layer that constitutes letters or designs. A method for manufacturing a laminated film according to claim 1 or 2, characterized by the above. [Claim 4] The thermoplastic resin is a propylene polymer. A method for manufacturing a laminated film according to claim 1 or 2, characterized by the above. [Claim 5] A manufacturing apparatus for producing a laminated film having a coating layer on a porous substrate layer made of a resin composition containing a thermoplastic resin and a filler, A first stretching apparatus for stretching a cast film layer obtained by extruding the resin composition in a first direction, An inkjet ejection device that applies a coating liquid to a first stretched layer obtained by the first stretching device from a plurality of ink ejection ports formed over the entire width of the first stretched layer to form a coating layer of uniform thickness, A second stretching apparatus for stretching the first stretched layer on which the coating layer is formed in a second direction perpendicular to the first direction, A manufacturing apparatus for laminated films, characterized by comprising the following features.

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