36 
Indian Forest Records. 
[Vol. IV 
This is a most important point and one, which it is necessary to carry 
out, in order to reduce the amount of starch before introducing the 
liquor, otherwise the percentage of caustic soda required to reduce 
the raw material to pulp is considerably increased. A period of two 
hours boiling in water is thought to be sufficient, after which it may 
be run off and the caustic liquor introduced. 
5. Results of boiling bamboos on a commercial scale. 
B. polymorpha, “ Kyathaung ” bamboos .—In order to give a correct 
idea of the results obtained by boiling bamboos on a commercial scale 
it will be necessary to quote from the report received from the Titaghur 
Paper Mills. They write as follows :— 
“ Our best results with B. polymorpha bamboos have been got with 
our special high pressure digester, which has been recently 
brought into use. So far we have been able to reduce our 
caustic to 18 per cent, and bleach quite up to our Govern¬ 
ment standard with 10 per cent, of 35 per cent, bleaching 
powder. Time under pressure was one hour at 110 lbs. and 
five hours at 80 lbs. per square inch. Our yield of pulp 
showed 46 per cent., caustic and bleach are calculated on the 
weight of air-dry bamboo. We are handicapped at present 
for want of a suitable cutter for the bamboo. This will 
be rectified at an early date, when we hope to still 
further modify our caustic and bleach.” 
C. pergracile “ Tinwa ” bamboo. —The following is their report on 
the trials made with this species :— 
“ Our trial boils with this species were made in our ordinary fibre 
digesters, at a pressure of 60 lbs. per square inch. The fibre was boiled 
with 23 per cent, of 77 per cent, caustic for ten hours. The pulp 
required 15 per cent, of 35 per cent, bleaching powder to bring it up to our 
standard of whiteness for Government printing paper. The yield in 
paper showed 40 per cent, caustic and bleach calculated on air-dry 
weight of raw material. Several boils were put through on similar 
lines with variations in time, caustic and pressure but the pulp ob¬ 
tained, under the above conditions, was probably the best of the 
boils. 
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