The recent progress and general status of the lipase pitch control technology in Japan
| Autor: | Yuko Fujita, Hidesato Shimoto, Kunio Hata, Masaki Sharyo, Haruo Awaji, Motoo Matsukura, Mariko Isaji, Hiromichi Sakaguchi |
|---|---|
| Rok vydání: | 1993 |
| Předmět: |
biology
business.industry Mechanical Engineering Pulp (paper) Paper mill General Chemistry engineering.material Talc biology.organism_classification Pulp and paper industry chemistry.chemical_compound Hydrolysis Pinus densiflora chemistry Pitch control Media Technology biology.protein medicine engineering Organic chemistry General Materials Science Lipase Hydrogen peroxide business medicine.drug |
| Zdroj: | JAPAN TAPPI JOURNAL. 47:1223-1233 |
| ISSN: | 1881-1000 0022-815X |
| DOI: | 10.2524/jtappij.47.1223 |
| Popis: | When Japanese red pine (Pinus densiflora) was used as a main resource for groundwood pulp (GP), a group of triglycerides (TG) was identified as one of the most troublesome components which caused pitch problems in paper making process. As reported previously, lipase could hydrolyze TG to less sticky components and prevent pitch deposition.Lipase (Resinase A 2 X) produced in industrial scale from Aspergillus sp. at Novo Nordisk A/S was selected for this purpose from several lipases. The effect of enzyme dosage and profiles of pH and temperature on hydrolysis of TG were investigated in laboratory scale. As a result, more than 70% hydrolysis of TG was achieved at 500ppm dosage to GP. The enzyme showed the stable activity in the condition of 60°C, at pH 4 and 70°C, at pH 7. Based on the laboratory results, the first trial was carried out in Isinomaki mill unbleached GP fiber line of Nippon Paper Industries Co., Ltd. The mill trial has demonstrated a dramatic reduction in pitch problems as well as several other unexpected advantages. The fresh wood ratio was increased up to 50% in Ishinomaki mill.Nippon Paper Industries has been employing the enzymatic pitch control technology in paper making process for more than 3 years at unbleached lines. Recently lipase (Resinase A 2 X) is successfully applied to bleaching tower of bleached GP line at Ishinomaki mill. This technology has been successfully introduced to Daishowa Paper MFG. Co., Ltd. Fuji Mill and Hokuetsu Paper Mills., Ltd. Niigata Mill.A paper mill can obtain following advantages by introducing lipase pitch control technology. a) The number of defects of paper and amount of pitch are decreased. The runnability of paper machine is increased. b) The frequency of cleaning machine is reduced. c) The dosage of chemicals, such as fine talc, cationic polymers, is dramatically reduced. d) Seasoning (storage in the woodyard) costs are saved (eg. wages, land rent, interest) e) The fresh wood ratio is increased. It results in higher brightness and reduces the cost of hydrogen peroxide for bleaching of GP. f) Increasing of dynamic friction coefficient (DFC) of paper saves expensive amorphous silica gel (white carbon). |
| Databáze: | OpenAIRE |
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