| abstract |
The joining portion has a cylindrical distribution pin, and a groove is formed in the main surface thereof. The size of the groove is strictly determined. The first and third dope are supplied through each groove to restrict the width of each dope. Thereafter, the surface and the third dope are joined with the second dope. Thus, multilayers are obtained and cast through the die lip of the casting die to form a casting film having a multilayer structure. The casting film is dried to obtain a multilayer film.n n n n Feed Blocks, Casting Dies, Distribution Pins, Grooves |