Claims
- 1. A coating method comprising the steps of:
- continuously running a flexible support with the slot of a coating head abutted against said flexible support, said coating head having a doctor edge portion and a back portion, said doctor edge portion being forward of said back edge portion in a direction of travel of said flexible support, said slot being defined between said doctor edge portion and said back edge portion;
- applying coating solution to said flexible support with said coating head through said slot;
- supporting edges of said flexible support on said coating head so that, of both edge portions of said flexible support to which no coating solution is applied, first parts which are close to a coating portion of said flexible support are held out of sliding contact with both ends of said coating head by recesses formed in said both ends of said coating head, and second parts outside of said first parts are supported by shoulder portions of said head formed outside said recesses; and
- blocking the flow of said coating solution through said slot in areas adjacent said edge portions of said flexible support to which no coating solution is applied to thereby define a coating width with a pair of regulating boards disposed between said doctor edge portion and said back edge portion.
- 2. The method of claim 1, wherein said recesses are rectangular in cross section.
- 3. The method of claim 1, wherein said recesses are triangular in cross section.
- 4. The method of claim 1, further comprising the step of applying a solvent to said shoulder portions of said coating head outside said recesses to lubricate running of said edge portions of said flexible support.
- 5. The method of claim 4, wherein said solvent is selected from the group consisting of butyl acetate and methylethyl ketone.
- 6. A coating method comprising the steps of:
- continuously running a flexible support with the slot of a coating head abutted against said flexible support, said coating head having a doctor edge portion and a back portion, said doctor edge portion being forward of said back edge portion in a direction of travel of said flexible support, said slot being defined between said doctor edge portion and said back edge portion;
- applying coating solution to said flexible support with said coating head through said slot;
- supporting edges of said flexible support on said coating head by jetting a fluid through said coating head towards said edges of said flexible support so that, of both edge portions of said flexible support to which no coating solution is applied, parts which are close to a coating portion of said flexible support are held out of sliding contact with both ends of said coating head; and
- blocking the flow of said coating solution through said slot in areas adjacent said edge portions of said flexible support to which no coating solution is applied to thereby define a coating width with a pair of regulating boards disposed between said doctor edge portion and said back edge portion.
- 7. The method of claim 6, wherein said fluid comprises air.
- 8. The method of claim 6, wherein said fluid comprises nitrogen.
- 9. The method of claim 6, wherein said fluid comprises a solvent.
- 10. The method of claim 9, wherein a viscosity of said solvent is less than 50 cp.
- 11. The method of claim 9, wherein a viscosity of said solvent is less than 30 cp.
- 12. The method of claim 9, wherein a viscosity of said solvent is less than 10 cp.
- 13. The method of claim 9, wherein a surface tension of said solvent is in a range of 20 to 40 dyne/cm.
- 14. In a coating apparatus in which a coating solution is applied to a continuously running flexible support from a coating head abutted against said support, the improvement wherein a coating solution is extruded through a slot of said coating head, a pair of recesses are provided at both ends of said coating head in such a manner that said recesses confront both edge portions of said flexible support to which no coating solution is applied, said recesses extending in a direction of running of said flexible support, a pair of shoulders are provided which define said recesses at the ends of said coating head, said shoulders supporting both edges of said flexible support, which are uncoated, and a pair of regulating boards is provided at both ends of said slot for defining a coating width.
- 15. The coating apparatus of claim 14, wherein said recesses are rectangular in cross section.
- 16. The coating apparatus of claim 14, wherein said recesses are triangular in cross section.
- 17. In a coating apparatus in which a coating solution is applied to a continuously running belt-shaped flexible support from a coating head abutted against said support, the improvement wherein a coating solution is extruded through a slot of said coating head, a pair of fluid jetting outlets for jetting fluid towards both edges of said flexible support are provided at both end portions of said coating head which confront respective edge portions of said flexible support to which no coating solution is applied, said fluid jetted through said fluid jetting outlets spacing the edge portions of said belt-shaped flexible support away from the end portions of said coating head to prevent said edge portions of said belt-shaped flexible support from being brought into contact with said end portions of said coating head, and a pair of regulating boards is provided at both ends of said slot for defining a coating width.
- 18. The coating apparatus of claim 17, wherein said fluid comprises air.
- 19. The coating apparatus of claim 17, wherein said fluid comprises nitrogen.
- 20. The coating apparatus of claim 17, wherein said fluid comprises a solvent.
- 21. The coating apparatus of claim 20, wherein a viscosity of said solvent is less than 50 cp.
- 22. The coating apparatus of claim 20, wherein a viscosity of said solvent is less than 30 cp.
- 23. The coating apparatus of claim 20, wherein a viscosity of said solvent is less than 10 cp.
- 24. The coating apparatus of claim 20, wherein a surface tension of said solvent is in a range of 20 to 40 dyne/cm.
Priority Claims (2)
Number |
Date |
Country |
Kind |
63-320546 |
Dec 1988 |
JPX |
|
1-34940 |
Feb 1989 |
JPX |
|
Parent Case Info
This is a continuation of application Ser. No. 07/454,237 filed Dec. 21, 1989, abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4025671 |
Creamer |
May 1977 |
|
4907530 |
Shibata et al. |
Mar 1990 |
|
Continuations (1)
|
Number |
Date |
Country |
Parent |
454237 |
Dec 1989 |
|