lphite and 85.1 per cent of the hurd stock.
After loading with 14.7 per cent of clay and sizing with 1.28 per cent
of resin size, the furnish was given two hours' medium brush, tinted,
and run on to the paper machine at 70 feet per minute. Again the Jordan
refiner did not seem to reduce the wood shives sufficiently, and it was
left "just off." No trouble which could be attributed to the stock was
experienced on the paper machine. The color of the resulting paper is
due to the use of too little blue in tinting and probably in some
measure to the use of too low a percentage of bleach.
Run No. 141 was made from the stock of cooks Nos. 308 and 309 in
practically the same manner as run No. 140. The stock was washed and
brushed one hour, bleached (the record of the amount of bleach was
lost), made into a furnish of 14.7 per cent of sulphite and 85.3 per
cent of hurd stock, loaded with 14.9 per cent of clay, sized with 1.26
per cent of resin size, given one hour at a medium brush, tinted, and
run on to the machine. The Jordan refiner was able to reduce the wood
shives to a somewhat greater degree than in previous runs and was held
at a medium brush. The stock acted well on the machine and produced a
sheet of better quality than any preceding, with the exception of the
color, which was due to using too small a quantity of blue.
Among the cooks made for run No. 142 are Nos. 312 and 313, in which the
concentration of the caustic soda was raised to 113 and 116 grams per
liter and the percentage employed was also increased. In spite of these
increases the stock from these two cooks did not show any appreciable
improvement when dumped from the rotary. Stock from cooks Nos. 310, 311,
and 312 was given a medium brush and washing of one hour, bleached with
10.95 per cent of bleach, made into a furnish consisting of 15.2 per
cent of sulphite and 84.8 per cent of hurd stock, loaded with 15.2 per
cent of clay, sized with 1.28 per cent of resin size, given a medium
brush for one hour, tinted, and pumped to the stock chest. Stock from
cooks Nos. 313 and 314 was treated in exactly the same manner, except
that 11.4 per cent of bleach was used. It was pumped to the stock chest
and mixed with the furnished stock from cooks Nos. 310, 311, and 312. A
medium Jordan brush was given the stock and it acted well on the paper
machine, which was speeded to 75 feet per minute. There seems to be a
tendency in the hurd stock to crush a little at the "dan
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