Device for coating a continuous web
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United States of America Patent
Stats
-
Dec 17, 1985
Grant Date -
N/A
app pub date -
Nov 23, 1983
filing date -
Feb 21, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A device for coating a continuous web that travels over a back-up roll. The force of application can be adjusted. The coating material is applied to the web with a slotted applicator pipe. The pipe extends over the width of the web and has a preliminary coating-material flow-regulating gap. The width of the gap can be adjusted. A coating-material flow-regulating lip and a return lip adjoin the gap in such a way as to constitute a coating-material flow-regulating chamber extending over the width of the web. The flow-regulating lip is a doctor bed and has a doctor batten that moves with little friction along at least one overflow-side slide face. The face of the doctor batten toward the web that is being coated is rectangular and demarcates in conjunction with the web a narrowing wedge-shaped gap with a geometry that depends on the degree of contact pressure. The overflow edge of the face is a straight and sharp stripping edge. The face and stripping edge of the doctor batten are flexible. Its face is highly resistant to wear. The doctor batten is forced against the web by an inflatable means of exerting contact pressure between the batten and the bed.
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