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EFFECTS OF PROCESSING OPERATIONS ON ZETA POTENTIAL AND CATIONIC DEMAND OF PULPS

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天津科技大学学报 2004年第S1期 278-282页

作者： nishi k. bhardwaj,Sanjay kumar,Pramod k. Bajpai Australian Pulp and Paper Institute Mon University Clayton-3168 Australia Research Engineer & Corresponding author Australian Pulp and Paper Institute Mon University Clayton-3168 Australia Scientific Assistant Deputy Director Thapar Centre for Industrial Research and Development Patiala - 147001 India

The zeta potential and cationic demands of various kraft pulps - unbleached, bleached and beaten to different freeness levels were determined in the laboratory. The zeta potential of pulp where the final stage was a lignin degrading and dissolving treatment such as alkaline extraction or hypochlorite was lower than the unbleached pulp. The cationic demand of unbleached pulp was higher compared to that of bleached pulp. Beaten pulps showed larger cationic demands than the unbeaten pulps, which can be attributed to the larger specific surface area of pulp components. Fibres become increasingly electronegative when beaten and therefore cationic demand of pulps increases with beating. When the zeta potential method is used with furnishes of different freeness, the linear relationship is observed. However, the slope is decreasing with the decrease in freeness of the pulp.

关键词： EFFECTS OF PROCESSING OPERATIONS ON ZETA POTENTIAL AND CATIONIC DEMAND OF PULPS CEH

EFFECTS OF PROCESSING OPERATIONS ON ZETA POTENTIAL AND CATIONIC DEMAND OF PULPS

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天津科技大学学报 2004年第A1期19卷 276-280页

作者： nishi k. bhardwaj Sanjay kumar Pramod k. Bajpai Australian Pulp and Paper Institute Mon UniversityClayton-3168Australia Research Engineer & Corresponding authorAustralian Pulp and Paper InstituteMon UniversityClayton-3168Australia Scientific AssistantDeputy Director Thapar Centre for Industrial Research and Development Patiala - 147001 India

关键词：牛皮纸浆 Z电势阳离子需求漂白纸浆电动学

WET STRENGTH PAPER REPULPING: LABORATORY EVALUATION

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天津科技大学学报 2004年第A2期19卷 226-232页

作者： nishi k. bhardwaj Vikas Rajan A. G. kulkarni Scientist (Ex) & Corresponding author Director Central Pulp and Paper Research Institute Saharanpur - 247 001 INDIAAsstt. Scientist (Ex)Director Central Pulp and Paper Research Institute Saharanpur - 247 001 INDIADirector Central Pulp and Paper Research Institute Saharanpur - 247 001 INDIA

关键词：实验室评估再制浆湿润强度纸无机化学浸水时间废纸回收利用

使用从灰霉菌PPHRI-4 NFCCI-3027中提取的原纤维素酶和木聚糖酶对静电复印废纸进行酶脱墨

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中国造纸 2015年第4期 75-76页

作者： PUNEET PATHAk nishi k bhardwaj AJAY k SINGH

本实验对使用从灰霉菌中提取的原纤维素酶和木聚糖酶对静电复印废纸进行脱墨的潜在应用进行了研究。实验考察了酶的添加点、用量、浆浓和反应时间,以期在不影响纸张强度性能的前提下获得最大可能的脱墨效率。结果表明,当使用100%的静电... 详细信息

本实验对使用从灰霉菌中提取的原纤维素酶和木聚糖酶对静电复印废纸进行脱墨的潜在应用进行了研究。实验考察了酶的添加点、用量、浆浓和反应时间,以期在不影响纸张强度性能的前提下获得最大可能的脱墨效率。结果表明,当使用100%的静电复印废纸时,酶脱墨比化学脱墨有更好的脱墨效率(+25.4%)、更高的亮度(+5.2%)、耐破指数(+23.9%)和耐折度(+15.9%)。另外酶脱墨的浆料打浆度提高19.6%,滤水时间减少17.3%。该酶的脱墨效率及打浆度达到商业纤维素酶的效果,但强度性能和亮度均显著改善。本实验取得的脱墨效率(95.2%)和其他使用100%的静电复印废纸的研究结果相当,但打浆度比以前使用100%静电复印废纸和办公室混合废纸的相关研究显著提高。实验还取得了使用酶进行脱墨所预期的低废水负荷。综上所述,从灰霉菌中所提取的原酶用于静电复印废纸脱墨的潜在应用得到了确认。

关键词：纤维素酶木聚糖酶灰霉菌脱墨滤水性复印废纸

阔叶木浆混合香蕉秆浆对纸张施胶、灰分留着率、物理强度和光学性能的影响

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中国造纸 2019年第5期 83-84页

作者： SANDEEP TRIPATHI IZHAR ALAM nishi k.bhardwaj

本实验研究了漂白香蕉秆(BS)浆与阔叶木(HW)浆的混合浆对烷基烯酮二聚体(AkD)施胶和研磨碳酸钙(GCC)加填纸张物理强度和光学性质的影响。两种浆混合后,纸张的强度性能明显提高,其撕裂指数、耐破指数和抗张指数分别提高了57. 4%、88. 3%... 详细信息

本实验研究了漂白香蕉秆(BS)浆与阔叶木(HW)浆的混合浆对烷基烯酮二聚体(AkD)施胶和研磨碳酸钙(GCC)加填纸张物理强度和光学性质的影响。两种浆混合后,纸张的强度性能明显提高,其撕裂指数、耐破指数和抗张指数分别提高了57. 4%、88. 3%和44. 4%。随着混合浆中BS浆用量的增加,混合浆阳离子电荷需求量增加,而游离度、滤水性和Zeta电位降低; Cobb60值也呈增加趋势,接触角减小。两种浆混合后,灰分含量和一次灰分留着率(FPAR)增加。BS浆具有的特性使其可用于开发需要高撕裂度和高阻气的纸种。与HW纸浆相比,BS纸浆的初始亮度和白度较低,因此随着BS浆用量的增加,纸张的光学性能略有下降。

关键词：混合浆填料留着率物理强度性能施胶接触角 Cobb60

REFINING BEHAVIOUR OF BAMBOO LONG FIBRE FRACTION PULP

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天津科技大学学报 2004年第S2期 41-46页

作者： nishi k. bhardwaj,S.V. Subrahmanyam,A. G. kulkarni DirectorCentral Pulp and Paper Research Institute Saharanpur - 247 001 INDIA Scientist&Correspondingauthor DirectorCentral Pulp and Paper Research Institute Saharanpur - 247 001 INDIA Seniors cientist DirectorCentral Pulp and Paper Research Institute Saharanpur - 247 001 INDIA

Refining of pulp significantly contributes to papermaking process by affecting the runnability of the stock and quality of end product. The greater the production rates of a paper, the greater are the effects of machine downtime through breaks. A correct approach towards refining treatment is very essential for energy savings and product with desired properties. Papermakers are being encouraged to use non-wood fibres for a variety of reasons - the environment, changing agricultural policy and long-term fibre supply. Compared with wood fibres, there is less knowledge on how to treat non-wood fibres for optimum performance. Laboratory studies aimed at understanding the behaviour of unbleached bamboo long fibre fraction pulp on refining in Escher Wyss Laborefiner under simulated process conditions included investigations of the important parameters like wet web tensile, wet web elongation, water retention value and paper strength properties. The paper describes the influence of two specific edge loads, 1000 and 1500 Ws/km on refining of pulp. Bamboo long fibre fraction pulp responds better to lower intensity refining to develop pulp strength.

关键词： Bamboo pulp Long fibre Refining Wet web strength Water retention value.

REFINING BEHAVIOUR OF BAMBOO LONG FIBRE FRACTION PULP

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天津科技大学学报 2004年第A2期19卷 41-46页

作者： nishi k. bhardwaj S.V. Subrahmanyam A. G. kulkarni DirectorCentral Pulp and Paper Research Institute Saharanpur - 247 001 INDIA Scientist&CorrespondingauthorDirectorCentral Pulp and Paper Research Institute Saharanpur - 247 001 INDIA Seniors cientistDirectorCentral Pulp and Paper Research Institute Saharanpur - 247 001 INDIA

关键词：精练水滞留值竹纸浆湿网长度馏分制浆长纤维

Inhibition of H2O2-induced DNA damage in single cell gel electrophoresis assay (comet assay) by castasterone isolated from leaves of centella asiatica

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Health 2010年第6期2卷 595-602页

作者： nishi Sondhi Renu bhardwaj Satwinderjeet kaur Madhu Chandel Neeraj kumar Bikram Singh 不详

Brassinosteroids (BRs) are a large group of polyhydroxy steroids, which regulate numerous aspects of plant growth and development, including stem elongation, leaf bending, tracheary element differentiation, stress protection and photomorphogenesis. Recent studies indicate antigenotoxic and anticancerous activities of these compounds. The role of natural BRs in H2O2 (hydrogen peroxide) -induced DNA damage in human lymphocytes is still unknown. The present study reports the presence of Castasterone from leaves of Centella asiatica, an important medicinal herb commonly used as a memory enhancer and immunomodulator. CA50 fraction isolated from Centella asiatica was characterized as Castasterone by electrospray ionization mass spectral data with standard Castasterone. An attempt has been made to study antigenotoxic activity of the isolated Castasterone against H2O2 -induced DNA damage in human blood lymphocytes using Single cell gel electrophoresis assay (Comet Assay). Castasterone at 10–9 M concentration proved to be effective in diminishing the DNA damage by 89.42 %.

关键词： Brassinosteroids Castasterone Comet Assay Hydrogen Peroxide

Inhibition of H2O2-induced DNA damage in single cell gel electrophoresis assay (comet assay) by castasterone isolated from leaves of centella asiatica

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