Patent ID: 7754125
Filing Date: 2010-07-13
Classification: B29C,B29K

Abstract:
1. A solution casting method comprising the steps of: discharging dope containing a polymer and a solvent as a casting bead from a casting die onto a moving support to form a casting film; solidifying said casting film on said support; peeling said solidified casting film from said support; drying said peeled casting film to form a film; applying to said casting bead a suppressing vibration for suppressing vibration generated in a thickness direction of said casting bead; a vibration detecting process for detecting said vibration; a sound wave generating process in which a suppressing vibration signal is generated based on said vibration detected by said vibration detecting process and sound wave is generated based on said suppressing vibration signal to apply said suppressing vibration to said casting bead, said suppressing vibration signal representing the phase and amplitude of said suppressing vibration for suppressing said vibration generated in the thickness direction of said casting bead; and a vibration generating process in which said suppressing vibration signal is generated based on said vibration detected by said vibration detecting process and said suppressing vibration is applied to said casting bead by a vibration generating device provided on said casting die based on said vibration signal, said suppressing vibration signal representing the phase and amplitude of said suppressing vibration for suppressing said vibration generated in the thickness direction of said casting bead.