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University, Dhaka). Comparative Studies of
Pulping of Jute Fiber, Jute Cutting and Jute
Caddis. Bang. J. Sci. Ind. Res., 2007, 42(4),
425-434.
Comparative studies of retted jute fiber, jute
cuttings and jute caddis were carried out in
producing dissolving and paper grade pulp.
Fiber length of jute fiber was longer than jute
cutting and caddis. Klason lignin content was
lower and a-cellulose content higher in jute
fiber than cuttings and caddis. Extractives
content in caddis was higher than jute fiber
and cuttings. Pulping of these raw materials
was done in soda-anthraquinone process.
Higher pulp yield and lower kappa number
was observed in jute fiber than that of jute
cuttings and caddis. Jute fiber pulp showed
better paper-making properties than jute
cuttings and caddis. The tear index of these
raw materials was similar to softwood. The
bleachability of jute fiber pulp was also better
than that of cuttings and caddis. These three
raw materials were also evaluated in producing
dissolving pulp by prehydrolysed kraft
process. Pulp yield and bleachability was
higher and kappa number lower for jute fiber
than jute cuttings and caddis, but α cellulose,
S 10 and S l8 values and viscosity were almost
similar in these three raw materials.
641 JAHAN, M.S. (Pulp and Paper Research
Division, BCSIR Laboratores, Dhaka). Formic
Acid Pulping of Bagasse. Bang. J. Sci. Ind.
Res., 2006, 41(3 & 4), 245-250.
Atmospheric formic acid pulping of bagasse
was done with varying formic acid con-
centration and cooking time. Pulp yield and
kappa number decreased with increasing
formic acid concentration or cooking time. The
optimal cooking conditions were 90 % formic
acid and 90 min of cooking at 95° C. The pulp
yield at this condition was 44.4 % and kappa
number 26.1. The strength properties were
acceptable in formic acid pulping of bagasse.
Addition of H 2SO 4 catalyst in formic acid
degraded carbohydrate, resulting lower pulp
yield and inferior strength properties. The
strength properties were improved slightly
after bleaching.
230
642 KHAN, M.R.; SAMAD, A.; BEGUM,
S.; ALAM, A.K.M.S.; CHOWDHURY, A.N.
& RAHMAN, M.Z. (BCSIR Laboratories,
Rajshahi). Metroglyph Analysis in Cotton
(Gossypium Sp.). Bang. J. Sci. Ind. Res., 2007,
42(4), 449-454.
Pattern of morphological variations was
studied in seven cultivars of cotton viz. (1)
DPL-41, (2) DPL-20, (3) BAC-49, (4) DPL-
50, (5) DPL-51, (6) JA/96-B and (7) DPL-90
by metroglyph and index score method
(Anderson, 1957). Two most variable
characters - plant height at maturity (PHM)
and fibre yield per plant (FYP) were selected
for X and Y axis, respectively. In metroglyph
diagram there appeared two clusters one
comprised of 2 and the other comprised of 3
cultivars. Cluster I representing cultivar nos. 1
and 2 and cluster II cultivar nos. 4, 5 and 7. In
both the clusters (Cluster I and II) the
members are not so closely associated. In
cluster I the members seems to form a straight
line and in cluster II they form a triangle. An
exceptional feature is the off location of two
glyphs representing cultivar nos.3 and 6.
643 SALAM, M.A.; FAROUQUI, F.I. &
MONDAL, M.I.H. (Dept. of Applied
Chemistry and Chemical Technology,
Rajshahi University, Rajshahi). A Study on
Sulphonated Jute-cotton Blended Yarn and
Fabrics and their Characteristics. Bang. J. Sci.
Ind. Res., 2007, 42(2), 281-286.
Sulphonated jute fibres were blended with
cotton at three different ratios, e g. 50:50,
60:40 and 70:30 for production of fine yarn
and comparatively better ratio have been
investigated. The plain woven fabric were
prepared by Sulphonated jute-cotton yarn. The
set of warp and weft blended yarns was done
on the one up and one down principle. The
physico-mechanical properties of blended yarn
and fabrics were studied and compared with
that of jute yarn, cotton yarn and fabric .