Sushma Mahajan , S. V. Singh , R. V. Rao , S. P. Singh , Pallavi Gupta

Abstract

Three clones of Eucalyptus hybrid were subjected to kraft pulping experiments at 16% total active alkali charge. Four trees of each clone were studied. Pulp yield, screened rejects, kappa number and physical strength properties in terms of tensile index, burst index and tear index were determined after beating the unbleached pulps in PFI mill at constant revolution of 8000. All the trees from these clones possessed adequate pulp yield and strength properties in the following order: Clone B(48.00%) > Clone C(43.71%) > Clone A(42.92%).

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P. P. Jain , Sushma Mahajan

Abstract

The toxicological studies, as given in the present paper, have revealed that no mortality of test animals was observed with refined/treated oil samples. However, sub-acute toxicity study, following oral route of the oil samples, may be required to arrive at fine conclusion. The preliminary studies, as given in the present paper, indicate that Jatropha curcas seed oil can be helpful in solving the problem of shortage of edible oils in the country, to some extent if a methodology is worked out to remove constituents responsible for inducing purging.

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Sushma Mahajan , A. K. Raj , S. P. Singh , S. N. Dhoundiyal , Y. K. Sharma , S. V. Singh

Abstract

The present paper gives a comparative account of basic density and kraft pulping characteristics of fourteen species of Barataung area and eighteen species of Middle Andman area of Andaman&Nicobar Islands. The properties of kraft pulps of individual species have also been evaluated. It has been found that the basic density varied widely with species in both areas. In Barstaung area the variation was from 0.302 to 0.847 g/cm², whereas for Middle Andaman gives area it was in between 0.261 to 0.728 g/cm². Laboratory experiments on kraft pulping of individual species have shown that most of them gave screened pulp in the range of 40-45% yield, the only exception being Mitraeyna retundifolia of Barataung area and Knema sp of Middle Andaman area which gave pulp yield below 40%. The physical strength properties of unbleached kraft pulps of all the species were found to be adequate for wrapping grade paper. Pilot plant trials have shown that the mixed species of both areas could be pulped wlth 18% active alkali (as Na₂O) to produce unbleached kraft pulps of about 45% of yield. The paper made from these unbleached kraft pulps on pilot paper machine was of satisfactory strength for use as wrapping paper. It was further established that these pulps could be bleached to 75 brightness by conventional C/E/H/H/ sequence to produce writing and printing paper.

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Sushma Mahajan , Y. K. Sharma

Abstract

Present study for the production of rayon grade pulp from Moringa oleifera (M. oleifera) by probydrolysed sulphate process shows that M. oleifera is a suitable raw material for the production of high alpba cellulose pulps for use in cellopbane and textile.

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Y. K. Sharma , Sushma Mahajan , P. P. Bhola

Abstract

The present investigation reveals that the Su-babul can be utilised for the production of alpha-cellulose. The chemical purity shows that the raw material is suitable for preparing cellophane and textile in high yield (39.8%).

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