US 6,592,931 B2Granted

Coating method

AssigneeFuji Photo Film Co., Ltd.

InventorsHideaki Takekuma, Mikio Tomaru

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Abstract

In a coating method, a precoating layer is applied to one surface of a web W laid between a plurality of web guide rollers GR while a leading end surface of an extrusion-type head portion EX is pressed against the one surface of the web. Accordingly, entrained air increasing as the transferring speed of the web becomes higher could be prevented from entering a coating point on a doctor edge surface near an outlet of a slot by the meniscus of coating liquid formed in a slight gap between the front edge surface of the extrusion-type head portion and the one surface of the web approaching there. As a result, the precoating layer having an excessive amount can be applied stably without turbulence at the coating point caused by the entrained air. Further, coating can be done stably in the rod portion by setting the thickness of the precoating layer for a final coating layer and a virtual coating layer.

Claims16

Dependent claims

A coating method comprising the steps of:

transferring continuously, a flexible long-sized band-shaped support along a web track which is formed by a plurality of web guide rollers;
applying a precoating layer in an excessive amount by a precoating apparatus, comprising an extrusion head portion, on one surface of said flexible long-sized band-shaped support which is supported on said plurality of web guide rollers, wherein a leading end surface of said extrusion head portion is pressed against said one surface of said flexible band-shaped support which is supported on said web guide rollers so that said precoating layer is applied thereto, further wherein a convex curved doctor edge surface disposed on a downstream side of said extrusion head portion is pressed against said one surface of said flexible band-shaped support;
and
pressing a rod portion, which is located downstream of said doctor edge surface, against said precoating layer to thereby scrape off at least a portion of said excessive amount of said precoating layer so as to lay a final coating layer measured to a desired amount,
wherein a relation between a coating amount of said precoating layer and a coating amount of said final coating layer satisfies an expression [1]:
6η−0.3≦H/h [1]
where H designates the coating amount of said precoating layer (cc/m2);
h, the coating amount and virtual coating amount of said final coating layer;
and η, viscosity (cp) of said coating liquid.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/427,065Filed 26 Oct 1999
Priority: JP 10-30577127 Oct 1998
Published: US 2002/0160099 A131 Oct 2002
Granted: 15 Jul 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

B05C 11/025
Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface: with an essentially cylindrical body, e.g.…
B05D 1/40
Processes for applying liquids or other fluent materials: distributing applied liquids or other fluent materials by members moving relatively to…
G03C 1/74
Photosensitive materials: applying photosensitive compositions to the base; Drying processes therefor
G11B 5/848
Processes or apparatus specially adapted for manufacturing record carriers: coating a support with a magnetic layer by extrusion