Doctor blade for use in coating continuous strips of material or similar substrates
First Claim
1. A resilient, strip doctor blade element adapted to be clamped at a clamped end portion along a clamping line, in a holder, with an obliquely formed chamfered metering surface for the coating or metering of a composition onto a web of material or a roll continuously moving at a constant rate, the chamfered metering surface located at an end of said blade element opposite said clamped end portion, wherein said blade element includes parallel upstream and downstream broad sides which define an upstream metering edge and a downstream metering edge with said chamfered metering surface, respectively, the doctor blade element having at least one modification in a cross section thereof along at least one line or edge parallel to one of the downstream metering edge and chamfered metering surface, wherein the doctor blade has a change in cross sectional thickness which is provided between the clamping edge and the chamfered metering surface either continuously or in at least one step discontinuity, the doctor blade having a first thickness adjacent the chamfered metering surface and a second thickness at the clamping edge, said first thickness greater than said second thickness, a chamfer angle α
- , formed between said downstream broad side and said chamfered metering surface, being between 25° and
45°
, and a complementary angle, formed between said upstream broad side and said chamfered metering surface, being equal to 180°
minus said chamfer angle α
.
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Abstract
The aim of the invention is to make it possible to vary independently of each other, i.e. better and more freely, the basic parameters in the design of a squeegee used as a flexible-plate doctor blade in a coating-material spreading device. These parameters may include the length of the chamfered surface in contact with the surface to be coated, the resistance to bending strain parallel to the spreading edge of the blade and the resistance to bending strain at right angles to the spreading edge of the blade. This aim is achieved by virtue of the fact that the flexible-blade doctor blade (squeegee) proposed does not have a constant thickness but is made up of two or more different cross-sections with steps parallel to the dosing edge, thus giving the flat sides of the doctor blade a substantially terrace-like structure. The blade may also have grooves parallel to the dosing edge.
101 Citations
4 Claims
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1. A resilient, strip doctor blade element adapted to be clamped at a clamped end portion along a clamping line, in a holder, with an obliquely formed chamfered metering surface for the coating or metering of a composition onto a web of material or a roll continuously moving at a constant rate, the chamfered metering surface located at an end of said blade element opposite said clamped end portion, wherein said blade element includes parallel upstream and downstream broad sides which define an upstream metering edge and a downstream metering edge with said chamfered metering surface, respectively, the doctor blade element having at least one modification in a cross section thereof along at least one line or edge parallel to one of the downstream metering edge and chamfered metering surface, wherein the doctor blade has a change in cross sectional thickness which is provided between the clamping edge and the chamfered metering surface either continuously or in at least one step discontinuity, the doctor blade having a first thickness adjacent the chamfered metering surface and a second thickness at the clamping edge, said first thickness greater than said second thickness, a chamfer angle α
- , formed between said downstream broad side and said chamfered metering surface, being between 25° and
45°
, and a complementary angle, formed between said upstream broad side and said chamfered metering surface, being equal to 180°
minus said chamfer angle α
. - View Dependent Claims (2, 3, 4)
- , formed between said downstream broad side and said chamfered metering surface, being between 25° and
Specification