Back to results
US 4,538,541 AGranted
Method of and apparatus for applying a uniform layer of liquid to a surface
OwnerJohannes Zimmerinventor
Life of this patent
Estimating the term…
Abstract
A liquid film as applied to a transfer drum or planar surface by the textural force of a member in a trough which contacts one wall of the trough to prevent entrainment of air into the body by the member, e.g. a roller, while a wiper or the like engages the surface to prevent entrainment of air by the latter into the trough.
Claims11
An apparatus for applying a liquid layer of controlled thickness to a surface comprising:
- a trough open in the direction of said surface and having a pair of opposite lateral walls relatively spaced apart from one another;
- means for feeding said liquid to said trough;
- a liquid-applying roller rotatable in said trough and extending the full width of said surface in said trough and in contact with one of said walls for transferring said layer of liquid from said roller to said surface, said roller having a liquid-transfer face of textured configuration;
- means on the other of said walls limiting access of air to liquid in said trough;
- and
- a yieldable pad on said one of said walls directly contacting said roller for preventing entrainment of air by said roller into liquid in said trough, said means on said other wall including a wiper engaging said surface and extending toward the region of contact of said roller with said surface to define a gap with said roller through which liquid is permitted to contact said surface, said pad being a brush having bristles engaging said roller.
3 more elements
An apparatus for applying a liquid layer of controlled thickness to a surface comprising:
- a trough open in the direction of said surface and having a pair of opposite lateral walls relatively spaced apart from one another;
- means for feeding said liquid to said trough;
- a liquid-applying roller rotatable in said trough and extending the full width of said surface in said trough and in contact with one of said walls for transferring said layer of liquid from said roller to said surface, said roller having a liquid-transfer face of textured configuration;
- means on the other of said walls limiting access of air to liquid in said trough;
- and
- a yieldable pad on said one of said walls directly contacting said roller for preventing entrainment of air by said roller into liquid in said trough, said means on said other wall including a wiper engaging said surface and extending toward the region of contact of said roller with said surface to define a gap with said roller through which liquid is permitted to contact said surface, said roller floating in said trough and being urged by movement of said surface into contact with said one of said walls.
3 more elements
An apparatus for applying a liquid layer of controlled thickness to a surface comprising:
- a trough open in the direction of said surface and having a pair of opposite lateral walls relatively spaced apart from one another;
- means for feeding said liquid to said trough;
- a liquid-applying roller rotatable in said trough and extending the full width of said surface in said trough and in contact with one of said walls for transferring said layer of liquid from said roller to said surface, said roller having a liquid-transfer face of textured configuration;
- means on the other of said walls limiting access of air to liquid in said trough;
- a yieldable pad on said one of said walls directly contacting said roller for preventing entrainment of air by said roller into liquid in said trough, said means on said other wall including a wiper engaging said surface and extending toward the region of contact of said roller with said surface to define a gap with said roller through which liquid is permitted to contact said surface;
- and
- magnetic means urging said roller against said surface.
4 more elements
An apparatus for applying a liquid layer of controlled thickness to a surface, comprising:
- a trough open in the direction of said surface and having a pair of opposite lateral walls relatively spaced apart from one another;
- means for feeding said liquid to said trough;
- a liquid-applying roller rotatable in said trough and extending the full width of said surface in said trough for transferring said layer of liquid from said roller to said surface said roller having a liquid-transfer phase of textured configuration;
- a yieldable pad on one of said walls directly connecting said roller for preventing entrainment of air by said roller into liquid in said trough;
- and
- a further roller extending the full width of the first mentioned roller in said trough and in contact with said first mentioned roller;
- a further yieldable pad on the other of said walls directly contacting said further roller for preventing entrainment of air by said further roller into liquid in said trough, said first mentioned roller having a smaller diameter than said further roller.
4 more elements
An apparatus for applying a liquid layer of controlled thickness to a surface, comprising:
- a trough open in the direction of said surface and having a pair of opposite lateral walls relatively spaced apart from one another;
- means for feeding said liquid to said trough;
- a liquid-applying roller rotatable in said trough and extending the full width of said surface in said trough and in contact with one of said walls for transferring said layer of liquid from said roller to said surface, said roller having a liquid-transfer face of textured configuration;
- and
- a wiper carrying said surface and extending toward the region of contact of said roller with said surface to define a gap with said roller through which said liquid is permitted to contact said surface, said wiper limiting access of air to liquid in said trough.
2 more elements
Dependencies are inferred from the claim text.