| US 7,588,709 B2 | ||
| Casting device, solution casting apparatus and solution casting method | ||
| Daisaku Abiru, Minami-ashigara (Japan); and Atsuo Futami, Minami-ashigara (Japan) | ||
| Assigned to FUJIFILM Corporation, Tokyo (Japan) | ||
| Filed on Aug. 15, 2007, as Appl. No. 11/839,175. | ||
| Claims priority of application No. 2006-221783 (JP), filed on Aug. 16, 2006. | ||
| Prior Publication US 2008/0042315 A1, Feb. 21, 2008 | ||
| Int. Cl. B29C 47/16 (2006.01) | ||
| U.S. Cl. 264—216 [425/376.1; 425/381; 425/382.4; 425/461; 425/466; 425/467] | 9 Claims |
| 1. A solution casting method, comprising steps of:
providing a casting device for flowing out a dope from a slit, said casting device including a pair of first slit members
forming first walls of said slit and a pair of second slit members forming second walls of said slit, said first walls extending
in a lengthwise direction of said slit, said second walls extending in a widthwise direction of said slit, a protrusion length
of a protrusion being at most 9 μm upon providing for said second slit member with said protrusion protruding from said first
slit member in a flow-out direction of said dope or for said first slit member with said protrusion protruding from said second
slit member in said flow-out direction;
running a support;
flowing out said dope from said slit so as to form a casting film;
peeling said casting film from said support; and
drying said peeled casting film to a film,
wherein a pair of side plates is respectively disposed along respective outer surfaces of said second slit members in said
widthwise direction of said slit.
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