Film production method
The present invention resolves a problem that occurs to a film which is being washed. A film production method of the present invention includes the steps of: (i) passing a heat-resistant separator above rollers located above a washing tank; (ii) lowering another roller into water through a space between the rollers; and (iii) moving at least one of the rollers and the another roller so as to increase a surface area by which the heat-resistant separator is in contact with the another roller.
1. A method for producing a film, the method involving a transfer of a film in a liquid provided in a liquid tank,
the method comprising the steps of:
(i) passing the film above a first roller and a second roller which are located above the liquid tank; and
(ii) lowering at least one third roller from above the film into the liquid through a space between the first roller and the second roller, wherein
a maximum space in an orthogonal direction orthogonal to a direction in which the at least one third roller is lowered, which maximum space is formed by the film being transferred, is larger than a space by which the first roller and the second roller are separated in the orthogonal direction.
2. The method as set forth in claim 1 , further comprising the step of:
(iii) rearranging at least one of the first roller, the second roller, and the at least one third roller so as to increase a surface area by which the film is in contact with the at least one third roller, wherein
in the step (iii), at least one of the first roller and the second roller is moved so as to narrow a space by which the first roller and the second roller are separated in an orthogonal direction orthogonal to a direction in which the at least one third roller is lowered.
3. The method as set forth in claim 2 , wherein
in the step (iii), the at least one of the first roller and the second roller is turned around a turning shaft provided parallel to a rotation axis of the at least one of the first roller and the second roller.
4. The method as set forth in claim 3 , wherein:
the at least one of the first roller and the second roller is provided above a wall surface of the liquid tank; and
the at least one of the first roller and the second roller is connected to a fourth roller which is turned in the step (iii) around the turning shaft in a direction in which the at least one of the first roller and the second roller is turned.
5. The method as set forth in claim 4 , wherein
in the step (iii), the first roller and the fourth roller are turned in a same direction.
6. The method as set forth in claim 1 , wherein
the at least one third roller is a plurality of third rollers,
the method further comprising the step of:
(iii) rearranging at least one of the first roller, the second roller, and the at least one third roller so as to increase a surface area by which the film is in contact with the at least one third roller,
in the step (iii), at least one of the plurality of third rollers is moved.
7. The method as set forth in claim 6 , wherein
in the step (iii), two of the plurality of third rollers are provided along a bottom surface of the liquid tank.
8. The method as set forth in claim 6 , wherein
the plurality of third rollers are connected to each other.
9. The method as set forth in claim 6 , wherein:
one end parts of the respective plurality of third rollers are connected to each other by a first bearing member;
the other end parts of the respective plurality of third rollers are connected to each other by a second bearing member; and
the first bearing member and the second bearing member are connected to each other.
10. The method as set forth in claim 1 , wherein:
the film is a laminated film obtained by coating one surface with a functional layer; and
in the step (i), the functional layer of the film faces downwards.
11. The method as set forth in claim 1 , wherein the film contains a wholly aromatic polyamide.