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R. V. Brat , Nahendra S. Jaspal

Abstract

Laboratory experiments on the sulphate pulping of Saccharum procerum Roxb. ( bhutang ) are described. Two pilot plant trials were carried out. The average fibre length of the pulp from bhutang is 2.30 mm. Easy bleaching pulps in yields considerably higher than usually obtained from bamboo or sabai grass were obtained. Writing and printing papers made on the pilot plant were characterized by good formation and satisfactory strength properties. Two samples of papers made from bhutang are appended in this bulletin.

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R. V. Brat , P. R. Gupta , R. L. Kapur

Abstract

Laboratory experiments on the production of pulps from Blue gum (Eucalyptus globulus Labill.) by the sulphate and soda processes are described. One pilot plant experiment was carried out by the sulphate process and well-cooked pulp in 57.9% yield of light brown colour was obtained. Wrapping paper made from 100% Blue gum was characterized by good formation and satisfactory strength properties. Since Blue gum is short fibred, its pulp will require to be admixed with a suitable portion of a long-fib red pulp, such as bamboo pulp, for the manufacture of wrapping papers on commercial paper machines. A sample of the wrapping paper made on the pilot plant is included in this bulletin.

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R. V. Brat , K. C. Virmani

Abstract

Experiments on the preparation of ground wood pulps from blue gum (Eucalyptus glabulus Labill.) and waattle wood (Acacia decurrens Willd.) under various conditions of grinding are described. Newsprint was prepared on the pilot plant paper machine of this Institute from a furnish containing 76% of blue gum groundwood pulp ( bleached) and 24% of bamboo sUlphate pulp (bleached). A sample of the newsprint is appended. Newsprint was also made on the pilot plant from a mixture of 75% of wattle groundwood pulp ( bleached) and 25% of bamboo Sulphate pulp (bleached). A sample of this newsprint is also appended.

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R. V. Brat , Man Mohan Singh

Abstract

A method for the preparation of viscose rayon grade pulp from blue gum wood has been worked out. Water-prehydrolysis sulphate process followed by muUltistage bleaching and refining has been used. The pulp was tested in Germany by a well-known viscose rayon pulp manufacturing firm and found to fulfil the conditions required for viscose rayon pulp.

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