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The edge wiper of a dip coater is provided with closely spaced slits, so that a convex meniscus of liquid is not carried away from the coating tank on the edges of the web which is being coated.
English (United States)
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The edge wiper of a dip coater is provided with closely spaced slits, so that a
convex meniscus of liquid is not carried away from the coating tank on the edges
of the web which is being coated.
The figure shows but one edge of a web l0 which is traveling in direction ll,
away from a coating tank, not shown. Two edge wipers l2 (only one of which is
shown in the figure) are mounted to wipe the opposite edges of the web. Each
wiper l2 is mounted so as to be capable of movement transverse the web's
direction of movement, as represented by arrows l3. The wiper contains a
number of slits l4, spaced about l/l6th inch apart. Since the wiper is capable of
transverse movement, the wiper will always locate itself such that a slit l4 is
positioned exactly at the edge of the web. In this way, one of the individual wiper
flaps, as formed by adjacent slits l4, wipes the edge of the web.
In the event that wiper l2 is a full-width wiper, such that a single wiper covers
the entire transverse width of the web, then slits l4 are cut in mating opposite-end
pairs, so that mating pairs of slits are spaced by the width dimension of the web.
Thus, the wiper will automatically position itself, transverse the web, so that the
opposite edges of the web are again wiped as shown in the figure.