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Pitampura, India

Chauhan V.S.,Thapar Center for Industrial Research and Development | Kumar N.,Thapar Center for Industrial Research and Development | Kumar M.,Star Paper Mills Ltd | Thapar S.K.,Anmol Polymers Pvt. Ltd. | Chakrabarti S.K.,Thapar Center for Industrial Research and Development
Taiwan Journal of Forest Science | Year: 2012

Primary fiber fines were screened out of virgin mixed hardwood chemical pulp through a Bauer McNett Fiber Classifier with 2 output materials of fibers and fines. The screened primary fiber fines were blended into the pulp to obtain pulps with no fines, and with 10 and 20% fines. The refining of all pulp samples was carried out in a PFI mill. The pulp with 10 and 20% fines respectively required 10.8 and 28.9% fewer PFI revolutions to obtain a 400 ml CSF level compared to the pulp without fines. At the same freeness level, the opacity of the paper increased with the addition of 10 and 20% fines by 1.7 and 2.6 points, respectively. Similarly, the formation of paper also improved by 2.0, and 10.2% with the respective addition of 10 and 20% fines to the pulp. The bulk and stiffness of the paper improved with the addition of fines up to a 450 ml CSF level. The strength properties, such as the breaking length, burst index, tear index, double fold, and Scott bond, decreased with the addition of fines. Source


Chauhan V.S.,Thapar Center for Industrial Research and Development | Kumar N.,Thapar Center for Industrial Research and Development | Kumar M.,Star Paper Mills Ltd | Thapar S.K.,Anmol Polymers Pvt. Ltd.
Taiwan Journal of Forest Science | Year: 2013

Long-fibered softwood and bamboo pulps with respective average fiber lengths of 2530 and 1688 μm were blended with eucalyptus pulp of 696 μm in average fiber length. The target was to obtain a weighted average fiber length (WAFL) of the blends similar to acacia pulp at 990 μm average fiber length. All pulps were refined with different PFI mill revolutions, and handsheets were produced. The refining behavior, drainage of pulp, and various paper properties (bulk, tensile strength, burst strength, tear index, double fold, Scott bond, air permeability, and formation) were determined and compared. The WAFL had no effect on the refining energy demand or drainage rate of the blended eucalyptus pulp. The intrinsic fiber length of the pulp furnish had greater effects on the paper properties than did the WAFL. Acacia pulp provided lower paper strength compared to eucalyptus pulp at the same refining level. The tear index was higher with acacia than eucalyptus pulp, and after blending with softwood and bamboo, eucalyptus provided a greater tear index than did acacia, which illustrates the effect of the WAFL on the tear index of paper. At 500 mL CSF, respective increases in the tear index of paper made from eucalyptus pulp blended with softwood and bamboo pulps were 3 and 20% compared to that of acacia pulp. Source


Chauhan V.S.,Thapar Center for Industrial Research and Development | Kumar N.,Thapar Center for Industrial Research and Development | Kumar M.,Star Paper Mills Ltd | Chakrabarti S.K.,Thapar Center for Industrial Research and Development | Thapar S.K.,Anmol Polymers Pvt. Ltd.
Palpu Chongi Gisul/Journal of Korea Technical Association of the Pulp and Paper Industry | Year: 2011

Beating or refining is an energy intensive process in paper industry. In India, most of the paper industries blend long fibered softwood pulps with short fibered hardwood or agro based pulps to get the paper properties of competitive level. Refining characteristics of the blend of pulps is very crucial with respect to freeness and strength properties. This study has been carried out to understand the refining behavior of three hardwood pulps and a softwood pulp. The hardwood and softwood pulps are blended in different proportions in two different ways; a) blending after their separate refining, and b) blending before refining followed by mixed refining of the blended pulps. Freeness of pulp, strength, optical and surface properties of paper along with formation have been determined and compared for both the refining methods. The fiber classification of refined pulps was also carried out to analyze the effect of refining method on fiber morphology. The mixed refining of hardwood and softwood pulps marginally affects the fiber morphology in comparison to separate refining of pulps. The strength and other properties of paper prepared from mixed refining of pulps are either better or comparable than those of separately refined pulps. Source


Kumar S.A.,Anmol Polymers Pvt. Ltd. | Sharma S.K.,Anmol Polymers Pvt. Ltd. | Ankush G.,Anmol Polymers Pvt. Ltd.
IPPTA: Quarterly Journal of Indian Pulp and Paper Technical Association | Year: 2012

A number of Cellulase based enzymes have proved quite successful and viable in improving the refiining and drainage characteristics of various pulps. A number of mills in India and abroad are using these enzymes for Fiber modiciation purpose. The dosage required varies depending upon the fiber furnish and mill conditions. Generally a dosage of around 50-100 gms is sufficient. These enzymes have been tested both on the lab scale as well as on commercial scale in mills. Every mill has to determine the viability of using these enzymes as its effect varies with the mill conditions and the fiber furnish. This paper deals with the case studies and general information regarding the various enzymes being used for this purpose. Source

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