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Title: Cost reduction in ivory base paper - Bleaching process
Authors: Dutt, Dharm
Upadhyaya, J S
Malik, R S
Tyagi, C H
Keywords: Ivory base paper;Bleaching process;Cost reduction
Issue Date: Mar-2004
Publisher: CSIR
IPC Code: Int Cl.7: D 21 H 19/04
Abstract: Globalization has compelled the Indian pulp and paper industry to improve the product quality with cost reduction keeping the same profit level to survive in a globally competitive market. With this background, the cost reduction aspect of ivory base paper used as top layer in decorative laminates was studied. In present practice, generally a pulp of brightness of 85 per cent (ISO) was selected for manufacturing of ivory base paper by most of the Indian pulp and paper industries. A pulp of brightness 76.6 per cent was used to develop ivory base paper. Experiments were also conducted to replace caustic with soda ash partially in alkali extraction and O2 and H2O2 reinforced alkali extraction stages. 30 kg caustic and 5 kg soda ash/t of pulp in alkali extraction and O2 and H2O2 reinforced alkali extraction stages gave the similar results to that of 35 kg caustic/t of pulp in alkali extraction. It is observed that the optical and other important properties resemble to that of ivory base paper made from pulp of brightness 85 per cent (ISO). This will help not only in chemical savings but will preserve pulp biomass due to less pulp shrinkage also. Finally, 25 per cent TiO2 and 7 per cent soapstone to get 99 per cent opacity and 8 per cent ATH (Aluminum tri-hydroxide) to entrap fine particles of TiO2 without flocculation were mixed into the pulp brightness of 76.6 per cent (ISO) beaten at 30 0SR. Further, 1.0 per cent melamine formaldehyde resin for wet strength and, 0.039 per cent pigment red dye and 0.1785 per cent pigment yellow dye were added to develop ivory colour. In order to control blemishes of paper and to entrap the dyes on to fibre surface 0.200 kg of Sapco K. F. and sodium aluminates, respectively, per tonne of pulp and 0.03 per cent sodium hexa meta phosphate were added. The laboratory made Ivory base paper shows cost reduction of US $ 6.33 /t of pulp than the normal practice.
Page(s): 265-275
ISSN: 0975-1084 (Online); 0022-4456 (Print)
Appears in Collections:JSIR Vol.63(03) [March 2004]

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