| 摘要 |
Apparatus for coating moving web material includes an open trough containing a fluid coating agent over which a tensioned web to be coated travels. A pair of rotatable doctor rods are supported by the narrow edge areas of open channels across which the rods lie, the channels and the doctor rods extending widthwise parallel to the trough and adjacent each side thereof, with the rods forming upright extensions of the opposite sidewalls of the trough, so that the web contacts the rods sequentially as it traverses the trough. The rod on the far side of the trough relative to the moving web wipes the coating picked up from the trough by the web to desired thickness, and the channel support for the rod enables the rod to be wiped and cleaned by the narrow edge areas, which may be made from replaceable thin doctor strips that extend beyond the channel sidewalls. The trough and channels can be formed from a unitary base block that is adjustable relative to tension guide means for the web, the doctors rods may be of different sizes, and the doctor rods may be hollow to accommodate a heat exchange medium.
|
