Quality Improvement of Paper From Bamboo and Hardw
Quality Improvement of Paper From Bamboo and Hardw
Quality Improvement of Paper From Bamboo and Hardw
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This study is aimed to improve the quality of paper made from hardwoods (70-80%) and bamboo furnish (20-30%)
through fractionation process. The fiber fractionation followed by selective processing of each fraction proved to be a better
option to produce paper of improved quality in terms of strength, optical and printing properties. The paper also discusses
the machine runnability with fractionated pulp samples based on Wet web properties and fines content of fractionated pulp.
The possibilities of using different fractions in different grades were also explored. This is a good opportunity for mills
having multiple paper machines and making different varieties of paper.
Keywords: Fiber fractionation, Fiber rising, Bamboo, Hardwood, Refining, Fluff
IPC Code: D 21 H 17/72
Fig. 5 — Development of Tensile Index on beating of as such and Fig. 7 — Development of Tear Index on beating of as such and
different fractions of pulp (70-80% hardwood pulp & bamboo different fractions of pulp (70-80% hardwood pulp, 20-30%
20-30%) bamboo)
Fig. 6 — Development of Burst Index on beating of as such & Fig. 8 — Effect of specific scattered coefficient on beating of as
different fraction of pulp (70-80% hardwood pulp, 20-30% such and different fractions of pulp (70-80% hardwood pulp, 20-
bamboo) 30% bamboo)
of all these three can be collected together. The Strength Development in Different Fractions in Proposed
unbleached long fraction can be used to produce Fractionating System Simulated in the Laboratory
packaging grade papers. The short fraction after In the longer fraction, the development of tensile
bleaching is again separated into two fractions using and bursting strength is better than shorter fraction
slot type screen, the long fraction can be used for and overall strength is better than as such pulp (Figs
production of better grades of writing and printing 10-12). The folding endurance has also shown the
papers as well as copier papers and short fraction can same trend (Fig. 13). Tearing strength of longer
be used for ordinary writing printing and MG poster fraction has shown first increase and then drop on
grade quality. increasing the beating. This is a typical behavior of
SOOD et al: QUALITY IMPROVEMENT OF PAPER FROM BAMBOO AND HARDWOOD FURNISH 303
Fig. 9 — Typical fiber fractionation system for pulp containing hardwood and bamboo pulp
Fig. 11 — Apparent density vs Burst Index of mixed hardwood Fig. 13 — Apparent density vs In (No. of double folds) of mixed
and bamboo unbleached pulp (as such and different fractions) hardwood unbleached Pulp (as such and different fractions)
304 J SCI IND RES VOL 64 APRIL 2005
Table 7 — Fiber Characteristics of fractionated pulp samples containing bamboo and hardwood
Characteristics of Different Pulp Fractions and their manufacture writing and printing grade paper. By
Suitability for Different Grades fractionation, the development in bonding strength
The Curl Index, which indicates about the characteristics (tensile, bursting) at particular apparent
curvature of fibers, is the ratio of the true contour density level can be improved. This is due to
fiber length divided by the projected length of fiber separation of fibers having different fiber length, curl
minus one. The Kink Index indicates the abrupt and Kink Index.
change in fiber curvature. The fractionation of the The proposed fractionating system simulated in
pulp has helped in getting the pulp components laboratory using the pulp collected from mill also
having different fiber length, Kink Index and Curl indicates the better strength properties when pulp is
Index (Table 7). This indicated that different grades of fractionated as compared to unfractionated pulp thus
paper could be made using different fractions. confirming the above laboratory results. The wet web
Generally pulps with high Curl and Kink Indices TEA of long fraction is more than short fraction thus
produce paper of high Tear strength, bulk, wet web indicating its better runnability at paper machine with
stretch, porosity and absorbency. However, high Curl increased speed. The decrease in the fines contents of
and Kink give paper of lower tensile strength, fractionated pulp as indicated by long fraction to short
bursting strength and bending stiffness. fraction ratio will result in better drainability at wire
part of paper machine thus helping in increasing the
Conclusions
machine speed.
Fiber fractionation followed by selective processing
of each fraction for furnish (70-80% hardwood, 20-
References
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