Appeal No. 1999-0337
Application 08/323,839
DISCUSSION
Beck, the examiner’s primary reference, discloses a
multi--layer headbox for a paper making machine. The headbox
10 includes a plurality of stock receiving chambers 13, 14 and
15, turbulence generators 46, 47 and 48, tube-type stock
distributors 49, 50 and 51 and slice openings 20, 24 and 29,
these elements being arranged as shown in Figure 1. Beck
states that
[t]he stock receiving chambers 13, 14 and 15 may be
supplied from a common stock delivery and control
system, or from a plurality of separate stock
delivery and control systems, as indicated by
reference numerals 56, 57 and 58. By utilizing
separate stock delivery and control systems, the
stock applied to the distinct stock delivery
chambers may be of different quality or character to
enable the headbox to form paper sheets having
specific qualities. For example, the stock
receiving chambers 13 and 15 may receive a stock
slurry containing fillers and clays, while the stock
receiving chamber 14 receives a stock slurry which
contains strength fibers and chemicals.
Additionally, different colored stocks may be
supplied to different ones of the stock receiving
chambers to produce a mottled or marbleized effect
on the sheet being formed [column 4, lines 40
through 54].
It is not disputed that Beck’s disclosure of the headbox
embodiment having the common stock delivery and control system
teaches or would have suggested an apparatus meeting all of
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