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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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R. V. Rao , V. Kothiyal , P. Sreevani , S. Shashikala , S. Naithani , S. V. Singh

Abstract

Five trees of four and half years old growth representing 5 clones of Eucalyptus tereticornis Sm. Obtained from ITC Bhadrachalam Paper Boards, Andhra Pradesh, India were evaluated for pulp yield and strength properties. Variation in pulp yield, kappa number, holocellulose and lignin content, strength and anatomical properties was observed in five clones. Clone 3 yielded more pulp. The pulps of all the clones tested have adequate strength properties. Basic information on anatomical properties were also provided in the paper.

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S. V. Singh , A. K. Rai , S. P. Singh

Abstract

This paper gives briefy an account of the chemical and morphological characteristics of major species of bamboo used for papermaking The researches carried out on (i) pulping and bleaching (II) effect of morphological characteristics on sheet properties (iii) beating properties, and (iv) decay on storage and its effect on pulp properties have been reviewed and discussed. A brief description about industrial pulping and papermaking is given.

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S. V. Singh , Krishan Lal , S. S. Bhandari , S. P. Singh

Abstract

The paper gives a comparative account of the evaluatinn of Su-babul (L leucocpphala) ,grown in Pune. At Siliguri and Rajabhatkhawa, for bleached grade kraft pulp. The data on pulping and bleaching properties indicate that the wood from all the three sources can be pulped to obtain bleachable grade pulp (Kappa No 26 ± t) using 17% active alkali as Na₂O. The bleached pilip yield was about 45% in an the three cases. To achieve a pulp of 7% brightness CEH sequence with total chlorine application of 9.7% was adequate for samples for Pune and Rajabhatkhawa; whereas in case of Siliguri sample another stage of hypochlorite (2% av. Chlorine) was needed. The strength properties data indicate that wood of all the three localities is suitable for producing bleached kraft pulps for writing and printing papers. It was found that fibre characteristics (The Runkel ratio and shape factor) had marked influence on strenglh properties. The tensile index, tear index and burst index decreased with increase in the hunkel ratio and shape factor.

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Rita Dhawan , B. G. Karira , S. V. Singh

Abstract

In this paper, papermaking qualities of three mangrove species viz. Heritiera Nitoralis, Bruquiera conjugata and Rhizephora mucronota of Andaman and Nicobar islands have been evaluated. The results indicate that unbleached kraft pulps(44.68 5 yield) suitable for wrapping papers could be obtained from all the three species. The unbleached pulps(kappa number 25±1) could be easily bleached to a brightness of 74±1(Elrepho) using CEH sequence and by applying 9.0% total chloride. The bleached craft from all the three species were found to possess satisfactory strength properties for making writing and printing papers.

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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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K. S. Bhandari , S. S. Bhandari , S. V. Singh

Abstract

Kraft pulps from Acacia rodusta (9 year) and Acacia mellifera (4 year) were produced with 16% Active alkali at 25% sulphidity with pulp yield of 52.23% and 51.16% respectively. The pulps obtained could be bleached with C/E/H/H sequence to a brightness (Elrepho) of 70.62 and 68.0 respectively, the bleached pulp yield being 49.5% and 48.67%, respectively. The bleached kraft pulps obtained from both the species possessed almost similar physical strength properties. The investigations indicate that bleached kraft pulps from Acacia robusta and Acacia mellifera could he used satisfactorily for paper making with the addition of some long fibred pulp.

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S. R. D. Guha , Man Mohan Singh , S. V. Singh , Anil Kumar , D. P. S. Bist

Abstract

With the increase in the standard of living in the country the consumption of packaging paper is on the increase. To meet the production targets it is essential to produce more of fibrous raw materials especially long-fibred material. Cupressus lusitanica and Arancaria bidwillI are fast growing exotics from Mexico and Australia respectively. Proximate chemical analysis of the woods as well as fibre dimensions and their distribution in the pulp have been recorded. Kraft wrapping papers have been produced on the laboratory scale from both these materials.

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S. V. Singh

Abstract

An investigation on the suitability of Thuja orientalis L., for the production of kraft paper showed that the yield of the pulp and the strength properties are comparable with those obtained from other conifers tested in this laboratory.

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S. V. Singh ¹, R. K. Yadav ², S. K. Singh ²

Affiliations
1 Department of Genetics and Plant Breeding, C.S. Azad University of Agriculture and Technology, Kanpur (U.P.), IN
2 Department of Genetics and Plant Breeding, C.S. Azad University of Agriculture and Technology, Kanpur, U.P., IN

Abstract

The stability of 10 parents and their 45 F₁s and 45 F₂s of wheat were studied for days to 75%flowering, number of ear bearing tillers, plant height, spike length/plant, number of grains/spike, grain weight/spike, days to maturity and grain yield/plant at three diverse locations of Uttar Pradesh, India. The st 784-3 x K 9107, DL 784-3 x K 9644, K 9107 x K 9644, K 8027 x C 306, K 8027 x K 9644, C 306 x K 9644 and GW 373 x K 9644 were identified as stable and high yielder across environments in both the generations. These crosses can be exploited in further breeding programmes for developing high yielding stable varieties.

Keywords

Wheat, Grain, Yield, Stability

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