Appeal No. 1998-3018
Application 08/457,328
through 13). Conventionally, the multiple plies are
separately formed on individual cylinder molds (see page 1,
column 1, lines 24 through 46), with the inner or filler plies
being uniformly prepared by common beating and jordaning
equipment (see page 1, column 1, lines 47 through 53; and page
1, column 2, lines 15 through 21). The following passage
describes Booth’s departure from the customary preparation of
the inner or filler plies:
it has been found that, by the addition of
appropriate material, of which at least a portion is
applied after the water suspension of stock has been
divided for delivery to the several molds, it is
possible to control the rate of drainage from the
several plies and from the consolidated wet web in a
more logical manner and which assures desirable
results which have hitherto been unobtainable except
with additional cost for mechanical equipment and
cost for operation of such additional equipment.
In practice, it has been found desirable to
apply two or more chemical reagents, for example,
water soluble inorganic chemicals, which mutually
react to form an insoluble precipitate to cause
slower water drainage. One chemical may be added at
or before the division of the stock referred to
above, or after the division of the water suspension
of stock to be delivered to the several molds has
been effected. The other chemical used should be
applied after the stock has been divided into the
separate streams. In certain instances it is
desirable to provide diverse treatments for the
several plies of stock [page 1, column 2, lines 22
through 46].
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