Methods for applying a liquid to a web

Details Methods for applying a liquid to a web Methods for applying a liquid to a web

2008-01-22

2008-01-22

Parker, Fred J. (Department: 1792)

Coating processes

Spraying

With programmed control or using mechanized nozzle or...

C427S008000, C427S421100

Reexamination Certificate

active

07320814

ABSTRACT:
A method of spraying patterns on a web that includes directing at least one intermittent spray of liquid onto the web to form a pattern on the web; sensing a position of a leading edge of at least one of the spray and the pattern relative to one or more references on the web; generating a first correction signal when the leading edge is out of position; and adjusting the spray of liquid in response to the first correction signal to correctly position a leading edge of a subsequent pattern. The method further includes sensing a position of a trailing edge of at least one of the spray and the pattern relative to one or more references on the web; generating a second correction signal when the trailing edge is out of position; and adjusting the spray of liquid in response to the second correction signal to correctly position a trailing edge of subsequent patterns.

REFERENCES:
patent: 4164001 (1979-08-01), Patnaude
patent: 5018443 (1991-05-01), Bolger
patent: 5322706 (1994-06-01), Merkel et al.
patent: 5683752 (1997-11-01), Popp et al.
patent: 6246916 (2001-06-01), VonDerHaar et al.

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