Appeal No. 1997-2931
Application 08/237,034
providing independent drive motors for the rolls
used in supporting a web in each treatment station,
e.g., coating and drying including the backing roll
as shown in Fig. 1, in order to control and achieve
proper web tension. Thus in view of Kuhnel, it
would have been obvious to provide the backing rolls
in Sieberth et al or Murray with independent drive
means in order to achieve proper web tension.
[Answer, page 4.]
Hence, it is the examiner’s position that Kuhnel would
have suggested to one of ordinary skill in the art providing
the devices of the primary references with drive means for
controlling the speed of the backing roller of one of the
coating applicator and doctor units relative to the other in
order to control tensile stress of the web between said units.
We do not agree.
An objective of Kuhnel is to insure that the web is held
taut between the spaced pressure lines resulting from the
applicator nip 17 and the edge of the doctor blade 30 (column
5, lines 52-57; column 5, line 71 through column 6, line 1).
Kuhnel accomplishes this by controlling a number of operating
parameters of the apparatus. Upstream of the application nip
17, the web is subjected to a predetermined amount of inherent
tension by an adjustable tension device 26 of the supply roll
24 and by snubbing the web around a lead roll 28 before
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