| 摘要 |
PROBLEM TO BE SOLVED: To provide a soln. film forming method capable of markedly reducing longitudinal thickness irregularity of a resin film in producing the resin film by a soln. casting method for a resin soln. using a vacuum chamber. SOLUTION: In a soln. film forming method including operation for sucking the surface on the contact side with a temporary support 2 of a resin soln. extruded in a film form under vacuum by a vacuum chamber in emitting the resin soln. in a film form from the leading end of a casting die 1 to cast the same on the temporary support 2 passing the position slightly separated from the leading end of the casting die under the die to move, the emitting speed of the resin soln. is set to 7.0-38.0 m/min and the vacuum degree of the vacuum chamber 3 is set to -1--50 mm Aq to prouce a film enhanced in thickness accuracy. |
