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1. WO2006101220 - METHOD FOR PRODUCING POLYMER FILM

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

CLAIMS

1. A method of producing a film from a casing dope containing solvent and polymer, comprising steps of:
casting said casting dope from a casting die on a running support so as to form a casting film;
feeding out a first drying air from at least one first outlet confronting to said support so as to extend in a widthwise direction of said support and be situated closely in downstream from said casting die, a temperature of said first drying air being almost constant in the range of 500C to 1600C , a static pressure to said first drying air at the feeding is in the range of 50 Pa to 200 Pa;
feeding out a second drying air from a second outlet disposed in downstream from said first outlet and in a casting side from said support when a content of remaining solvent in said casting film decreases to a predetermined value, said outlet opening in a running direction such that said drying air may flow in parallel to said support;
peeling said casting film containing said solvent as said film; and
drying said film containing said solvent.

2. A method described in claim 1 , wherein a plurality of partitioning members are disposed in said first outlet so as to partition said first outlet into at least three partitions in a widthwise direction of said support.

3. A method described in claim 2, wherein air volume regulation members are attached onto the closest partitions to both side edge portions of said casting film, so as to regulate w r
a volume of said first drying air in a widthwise direction of said support.

4. A method described in claim 1 , wherein the feeding of said first drying air is performed until the content of remaining solvent in said casting film decreases to 250 wt.%.

5. A method described in claim 1, wherein a temperature of said second drying air is almost constant in the range of 500C to 1600C and a wind speed of said second drying air is almost constant in the range of 5 m/s to 20 m/s.

6. A method described in claim 1, wherein said casting film has a multi-layer structure constructed of a base layer contacting to said support and an exposure layer exposed to an atmosphere, said casting dope includes a base layer dope for forming said base layer and an exposure layer dope for forming said exposure layer, and the casting of said casting dope is a co-casting of said base layer dope and said exposure layer dope.

7. A method described in claim 6 , wherein a viscosity of said exposure layer dope is at most 40 Pa-s .

8. A method described in claim 1, wherein said first outlet has a slit-like form and a plurality of said first outlets is arranged in the running direction of said support.

9. A method described in claim 8, wherein an angle of a feeding direction of said first drying air toward said casting film on said support to said support is in the range of 30° to 90°.