Chemical pulp from kenaf bast / Chien Chu, Naiyana Niyomwan, Anchalee Puangvichit
โดย: Chu, Chien
ผู้แต่งร่วม: Niyomwan, Naiyana | Puangvichit, Anchalee
Language: English ชื่อชุด: Class. Invest. no.2ข้อมูลการพิมพ์: Bangkok : Thailand Institute of Scientific and Technological Research, 1972 หัวเรื่อง: Kenaf | Pulpsสารสนเทศออนไลน์: Click here to access full-text สาระสังเขป: Air-dry kenaf bast ribbons stripped from Thai kenaf stalks were cooked by NSSC process at 160 degree celsius for 2 hours with 8% sodium sulphite and 1% sodium bicarbonate. The NSSC pulp was refined and delignified with 4% chlorine dioxide at 80 degree celsius and pH 3.0 for one hour. Then alkali extraction with 2% caustic soda followed. Bleaching to 78% brightness was done with hypochlorite containing 5% available chlorine on pulp weight. Bleached yield of 60% was attained.สาระสังเขป: Bleached chemical pulp was prepared from retted kenaf bast fibre by delignification with chlorine dioxide. Thai kenaf retted fibre was trested with C10 2 in water at 90 degree Celsius and pH 3.0 for 20 minutes with liquor ratio 5: 1. Alkali extraction follwed, using 2% caustic soda with liquor ratio 6: 1, at 70 degree Celsius for .5 hour. Bleaching was done in two stages with 2% available chlorins as hypochlorite, than 0.75% available chlorine as C10 2. The bleached yield attained 80% with 82% brightness.สาระสังเขป: Both high yield chemical pulps have good quality comparable to bleached coniferous sulphite pulp.สาระสังเขป: Kraft pulping of Thai kenaf bast ribbons was made by cooking with 16.5% active Na2O and 20% sulphidity at 170 degree celsius for 1.5 hours. The pulp with 52% yield was bleached to 82% brightness with 8% chlorine in C/E/H bleaching sequence. Of the three pulps the bleached kraft with high freeness of S-R 890 ml and a bleached yield of 45% has the best quality in respect to pulp strength, featuring, at freeness 460 ml, breaking length 6761 m, tear factor 220, burst factor 53, folds 478, and bulk 1.65. - Authors.
| ชนิดของทรัพยากร | Location | Call number | สถานะ | Last seen | Copy No. | บาร์โค้ด |
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วว. เทคโนธานี | Available | 2018-08-31 | 1 | RP1972/272 | |
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วว. เทคโนธานี | Available | 2018-08-31 | 2 | RP1972/272-2 |
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