MANUFACTURING METHOD AND MANUFACTURING APPARATUS OF MULTILAYER FILM

To provide a manufacturing method and manufacturing apparatus of a multilayer film which can impregnate a porous body with coating liquid while accurately forming a coating film on both surfaces of the porous body with any physical property.SOLUTION: A manufacturing method of a multilayer film comprises the steps of: forming a first coating film by applying the first coating liquid to one surface of a sheet-like support body that is continuously conveyed; laminating a sheet-like porous body on the first coating film in such a state that the first coating film is undried; forming a second coating film by applying the second coating liquid to a surface on a side that is not in contact with the first coating film of the porous body in such a state that the first coating film is undried, discharging the second coating liquid from a die having a discharge surface formed with a slit-like discharge port, applying the second coating liquid while curving or bending the support body 1 and a porous body 3 by pressing the discharge surface against the porous body via the second coating liquid and impregnating the porous body with at least one of the first coating film and the second coating film; and simultaneously drying the first and second coating films.SELECTED DRAWING: Figure 1 【課題】どのような物性の多孔質体であっても、その両面に塗膜を精度よく形成しつつ、塗液を多孔質体に含浸させることが可能な多層膜の製造方法および製造装置を提供する。【解決手段】連続して搬送されるシート状の支持体の一方の面に第１の塗液を塗布して第１の塗膜を形成する工程と、第１の塗膜が未乾燥の状態で、第１の塗膜の上にシート状の多孔質体を積層する工程と、第１の塗膜が未乾燥の状態で、多孔質体の第１の塗膜に接していない側の面に第２の塗液を塗布して第２の塗膜を形成する工程であって、スリット状の吐出口が形成された吐出面を有するダイから第２の塗液を吐出し、第２の塗液を介して吐出面を多孔質体に押し付けることで支持体１および多孔質体３を湾曲または屈曲させながら第２の塗液を塗布しつつ、第１の塗膜と第２の塗膜の少なくとも一方を多孔質体に含浸させる工程と、第１および第２の塗膜を同時に乾燥させる工程を有する。【選択図】図１