Coating apparatus and method for applying coating solution on web
AssigneeFuji Photo Film Co., Ltd.
InventorsNobuo Hamamoto, Hideaki Usui
Life of this patent
Estimating the term…
Abstract
In a coating apparatus of slide bead type for applying a coating solution on a continuously-fed web, each of edge members has a edge member for regulating a width of coating solution flowing on a slide surface. A height Dg of a perpendicular wall of the edge member satisfies a condition Db≦Dg≦Ds, when Db is determined as a minimum thickness of bead formed by a coating solution, and Ds is determined as an upper limit of the upper limit of the height Dg. A distance between a web and a front end portion of the edge member is more than 100 μm.
Claims29
A coating apparatus of slide bead type for applying a coating solution on a web which is continuously fed, comprising:
- a die for discharging said coating solution to said web;
- a slide surface formed on a top of said die, said coating solution flows on said slide surface;
- a pair of edge members provided in both sides on said slide surface for regulating a width of said coating solution flowing on said slide surface;
- and
- a regulation portion which is provided on said each edge member, a bottom of said regulation portion contacting to said slide surface such that said regulation portion is perpendicular to said slide surface, and a height Dg of said regulation portion satisfying a condition Db≦Dg≦Ds,
- Db being a minimum thickness of bead at vena contracta and Ds being an upper limit of a height of said regulation portion, which are represented as follows,
- Db=1.03×h1−1.50×he×U−1/3+12800×he2×UDs={3×η×q/(ρ×g×sin α)}1/3
- wherein
- h1 is a distance between said web and a lip of said die,
- he is a thickness of said coating layer formed on said web,
- U is a feeding velocity of said web,
- η is an averaged viscosity of solution flowing on said slide surface at a share rate, p1 q is a total amount of said coating solution in a predetermined width,
- ρ is an averaged density of said solution,
- g is an acceleration of gravity, and
- α is an angle of slide surface.
A coating apparatus of slide bead type for applying a coating solution on a web which is continuously fed, comprising:
- a die for discharging said coating solution to said web;
- a slide surface formed on a top of said die, said coating solution flows on said slide surface;
- a pair of edge members provided in both sides on said slide surface for regulating a width of said coating solution flowing on said slide surface;
- and
- a regulation portion which is provided on said each edge member, a bottom of said regulation portion contacting to said slide surface such that said regulation portion is perpendicular to said slide surface, and a height Dg of said regulation portion satisfying a condition 0.15 mm≦Dg≦5 mm.
A coating apparatus of slide bead type for applying a coating solution on a web which is continuously fed, comprising:
- a die for discharging said coating solution to said web;
- a slide surface formed on a top of said die, said coating solution flows on said slide surface;
- a pair of edge members provided in both sides on said slide surface for regulating a width of said coating solution flowing on said slide surface;
- and
- a front end portion provided on edge member so as to be parallel to a tangent line at a lowest position of applying the coating solution on said web, and a height of said front end portion being lower than 0.6 mm.
A method for applying a coating solution on a web, comprising:
- feeding said web continuously;
- and
- discharging said coating solution from a slot of a die, said discharged coating solution flowing on a slide surface of said die, a width of said coating solution being regulated by edge members which are provided in both sides on said slide surface, said edge member having a regulate portion which is perpendicular to said slide surface,
- wherein a height Dg of said regulation portion satisfy a condition Db≦Dg≦Ds,
- Db being a minimum thickness of bead at vena contracta and Ds being an upper limit of a height of said regulation portion, which are represented as follows,
- Db=1.03×h1−1.50×he×U−1/3+12800×he2×UDs(m)={3×η×q/(ρ×g×sin α)}1/3
- wherein
- h1 is a distance between said web and a lip of said die,
- he is a thickness of said coating layer formed on said web,
- U is a feeding velocity of said web,
- η is an averaged viscosity of solution flowing on said slide surface at a share rate,
- q is a total amount of said coating solution in a predetermined width,
- ρ is an averaged density of said solution,
- g is an acceleration of gravity, and
- α is an angle of slide surface.
A method for applying a coating solution on a web, comprising:
- feeding said web continuously;
- and
- discharging said coating solution from a slot of a die, said discharged coating solution flowing on a slide surface of said die, a width of said coating solution being regulated by edge members which are provided in both sides on said slide surface, said edge member having a regulate portion which is perpendicular to said slide surface,
- wherein a height Dg of said regulation portion satisfy a condition 0.15 mm≦Dg≦5 mm.
A method for applying a coating solution on a web, comprising:
- feeding said web continuously;
- and
- discharging said coating solution from a slot of a die, said discharged coating solution flowing on a slide surface of said die, a width of said coating solution being regulated by edge members which are provided in both sides on said slide surface, said edge member having a regulation portion which is perpendicular to said slide surface,
- wherein a front end portion provided on edge member so as to be parallel to a tangent line at a lowest position of applying the coating solution on said web, and a height of said front end portion being lower than 0.6 mm.
Dependencies are inferred from the claim text.