Coating method and apparatus
AssigneeFuji Photo Film Co., Ltd.
InventorsToshihiro Mandai, Mikio Tomaru, Norio Shibata
Life of this patent
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Abstract
The coating apparatus and method enable the coating liquid having been scraped-off to be reused without doing any one of the fluid adjusting treatment and the filtering treatment, while maintaining the features of the scraping-off type of extrusion coater, which is suitable for obtaining a uniform and extremely thin coating film. The coating head is provided with two slits: a coating slit and a recovering slit, and the excessive coating liquid having been discharged through the coating slit and applied to the web is scraped-off and recovered through the recovering slit.
Claims19
A coating method, comprising the steps of:
- pre-coating one side of a continuously running sheet substrate strip with a coating liquid, using a pre-coating device, in an amount in excess of that capable of obtaining an intended final coating thickness;
- and then
- sucking-up an excess amount of coating liquid using a suction device provided on a downstream side along a running direction of the substrate relative to the pre-coating device,
- wherein the coating liquid having been applied to the substrate is not opened to the atmosphere during a time from the pre-coating until the sucking-up, and wherein all coating liquid that is sucked-up is recovered through a recovering line and is reused as a closed system such that the coating liquid that has been sucked-up is not exposed to air.
A coating apparatus, comprising:
- a pre-coating device which pre-coats one side of a continuously running sheet substrate strip with a coating liquid in an amount in excess of that capable of obtaining an intended final coating thickness;
- a suction device which sucks-up an excess amount of coating liquid, the suction device being arranged on a downstream side along a running direction of the substrate relative to the pre-coating device;
- a closing mechanism which prevents the coating liquid having been applied to the substrate from being opened to the atmosphere between the pre-coating device and the suction device;
- and
- a recovery system is provided such that all of the coating liquid that is sucked-up is recovered and reused as a closed system such that the coating liquid that has been sucked-up is not exposed to air.
Dependencies are inferred from the claim text.