Casting apparatus for formation of resin-made membrane

A casting apparatus for formation of a resin-made membrane comprising:

• a die for extruding a molten resin into a membrane;
• a cooling roll for receiving said membrane extruded from said die on its outer circumferential surface to deliver it while cooling;
• and a suction chamber for sucking air between said membrane and said cooling roll so that said membrane is brought closely into contact with a surface of said cooling roll,
• wherein said suction chamber has a suction opening and is equipped with a shielding plate for partially shielding said suction opening of said suction chamber, and
• wherein said suction chamber is disposed separately from said die, and a support mechanism is further provided to support said suction chamber in such a manner that said suction chamber is movable along a circumferential direction of said cooling roll.

A casting apparatus for formation of a resin-made membrane comprising:

• a die for extruding a molten resin into a membrane;
• a cooling roll for receiving said membrane extruded from said die on its outer circumferential surface to deliver it while cooling;
• and
• a suction chamber having a suction opening disposed adjacent said membrane, said suction opening extending laterally across said outer circumferential surface of said cooling roll for sucking air between said membrane and said cooling roll so that said membrane is brought closely into contact with said circumferential surface of said cooling roll,
• wherein said suction opening extending laterally with respect to said outer circumferential surface of said cooling roll is equipped with a shielding plate for restricting the lateral extent of said suction opening of said suction chamber, and
• wherein said shielding plate is selectively movable laterally with respect to said opening in suction chamber to thereby selectively vary the effective length of said suction opening.

A casting apparatus for formation of a resin-made membrane comprising:

• a die for extruding a molten resin into a membrane;
• a cooling roll for receiving said membrane extruded from said die on its outer circumferential surface to deliver it while cooling;
• and
• a suction chamber for sucking air between said membrane and said cooling roll so that said membrane is brought closely into contact with a surface of said cooling roll,
• wherein said suction chamber has a suction opening extending laterally with respect to said outer circumferential surface of said cooling roll and is equipped with a suction nozzle disposed in a side wall of said suction chamber adjacent said suction opening for sucking air from a lateral end portion of said suction opening.

A casting apparatus for formation of a resin-made membrane comprising:

• a die for extruding a molten resin into a membrane;
• a cooling roll for receiving said membrane extruded from said die on its outer circumferential surface to deliver it while cooling;
• and
• a suction chamber for sucking air between said membrane and said cooling roll so that said membrane is brought closely into contact with a surface of said cooling roll,
• wherein said suction chamber has a suction opening and is equipped with a shielding plate for partially shielding said suction opening of said suction chamber, said shielding plate being laterally movable with respect to said opening in said suction chamber, said suction chamber being further equipped with a suction nozzle disposed adjacent said suction opening for sucking air from a lateral end portion of said suction opening.