Coating method and apparatus
AssigneeFuji Photo Film Co., Ltd.
InventorsMikio Tomaru, Toshihiro Mandai, Norio Shibata
Life of this patent
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Abstract
It is possible to give ultrathin and uniform coating on a flexible web in scraping-off type coating. The distribution of pressure in a web width direction is adjusted by a pressure distribution adjusting device when an excess of coating liquid excessively applied is scraped off by a doctor blade by giving relative pressure to a coating surface of a web and the doctor blade after applying the coating liquid that is more excessive than the desired quantity of the coating liquid on the web by a precoating apparatus while making the web continuously travel.
Claims18
A coating apparatus which applies a coating liquid on a continuously traveling web with a precoating apparatus excessively than desired quantity of the coating liquid, and scrapes off an excess of the coating liquid with a doctor blade with relatively pressing the doctor blade on a coated side surface of the web, the apparatus comprising:
- a pressure distribution adjusting device which adjusts pressure distribution in a width direction of the web pressed.
A coating method for applying a coating liquid on a continuously traveling web with a precoating apparatus excessively than desired quantity of the coating liquid, and scraping off an excess of the coating liquid with a scraping-off member with relatively pressing the scraping-off member on a coated side surface of the web, wherein:
- coating thickness distribution in a width direction of the web before scraping-off of the excess of the coating liquid by the scraping-off member is adjusted to be 20% or less.
A coating method for applying a coating liquid on a continuously traveling web with a precoating apparatus excessively than desired quantity of the coating liquid, and scraping off an excess of the coating liquid with a scraping-off member with relatively pressing the scraping-off member on a coated side surface of the web, wherein:
- variance of coating thickness in a traveling direction of the web in a coating layer after scraping-off of the excess of the coating liquid by the scraping-off member is adjusted to be 20% or less.
A coating method for applying a coating liquid on a continuously traveling web with a precoating apparatus excessively than desired quantity of the coating liquid, and scraping off an excess of the coating liquid with a scraping-off member with relatively pressing the scraping-off member on a coated side surface of the web, wherein:
- a crimp of the web in a position of the scraping-off member is prevented.
A coating apparatus which applies a coating liquid on a continuously traveling web with a precoating apparatus excessively than desired quantity of the coating liquid, and scrapes off an excess of the coating liquid with a doctor blade with relatively pressing the doctor blade on a coated side surface of the web, wherein:
- thickness of the doctor blade in a traveling direction of the web is 1 mm to 30 mm.
A coating method for applying a coating liquid on a continuously traveling web with a precoating apparatus excessively than desired quantity of the coating liquid, and scraping off an excess of the coating liquid with a scraping-off member with relatively pressing the scraping-off member on a coated side surface of the web, wherein:
- evaporation of a solvent vaporizing from the coating liquid on the web is controlled between from the precoating apparatus to the scraping-off member lest a concentration of a solid component in the coating liquid applied on the web should exceed 80% at a position of the scraping-off member.
Dependencies are inferred from the claim text.