Coating apparatus
AssigneeFuji Photo Film Co., Ltd.
InventorsYasunori Tanaka, Shinji Noda, Hiroshi Chikamasa
Life of this patent
Estimating the term…
Abstract
An extrusion type coating apparatus for applying a coating film to a support has a bent doctor edge made of cemented carbide having a very large hardness. The bent doctor edge has a very large obtuse angle and the resulting doctor edge allows the coating film to be applied smoothly to the support. Since the doctor edge is made of cemented carbide having a very high hardness, the doctor edge is not unduly worn by abrasives contained in the coating film thereby improving the wear-resistance of the apparatus.
Claims14
An extrusion type coating apparatus for continuously extruding a coating solution out of an open end of a slot which is set close to a surface of a belt-shaped flexible support running continuously along a predetermined running path in order to apply said coating solution to the surface of said support, comprising:
- a doctor edge adjacent to said slot for metering a desired thickness of said coating solution applied to said support;
- said doctor edge having adjacent flat doctor surfaces bent relative to one another along a first edge extending in a widthwise direction of said support, said adjacent doctor surfaces forming an obtuse angle at said first edge which is sufficiently large to enable said running path of said belt-shaped flexible support to be parallel to both said adjacent doctor surfaces, said running path of said belt-shaped flexible support changing direction in a vicinity of said first edge;
- said obtuse angle being at least 165.degree., one of said two adjacent doctor surfaces which is on a downstream side of said support having a length of 1 mm to 15 mm, while the other adjacent doctor surface which is on the upstream side of said support has a length of 0.1 mm to 2 mm.
Dependencies are inferred from the claim text.