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RISS 인기검색어
- 검색키워드
- 저자 : M.N.Belgacem (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
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[Poster Presentation] Banana Wastes as a Source of Lignocellulosic Fibres For Papermaking
R.Noronha,N.Cordeiro,M.N.Belgacem,A.P.Costa,J.Silvy 한국펄프·종이공학회 1999 한국펄프종이학회 기타 간행물 Vol.- No.-
The chemical composition of crops from banana (Musa accuminata Colla) was studied. Two types of material were investigated, namely: the whole material (type Ⅰ) and the outer bark material (type Ⅱ), which was apparently rich in cellulose fibres. These characterisation showed that the amount of holocellulose is high enough (~70%) to envisage the pulping of this material despite its surprisingly high content of ashes (~14%). It is worth noting that. as expected. the type Ⅱ material was found more rich in cellulose.<br/> Soda and Soda-Anthraquinone cooking processes were carried out using mini-digestors and the optimal pulping conditions were established. In fact. it was found that the maximum of yield is obtained when the following pulping conditions are respected: alcali 18%. time of the reaction: 1 hour to reach the isothermal regime and 30 min of pulping at 120℃. The kappa number of theses pulps was found around 30, which is very acceptable for unbleached pulps. The use of anthraquinone was found to increase the yield of pulps very slightly. The morphology of the fibers thus obtained was determined and showed that about 80% of fibres have a length between 1.4 and 1.9㎛. The width of these fibres was also determined and found in the range of 10-30㎛. Finally, hand sheet paper with two basis weights (60 and 135 g/m²) were made from pulps using the optimal conditions of cooking (300 g OD of crops). The yield and the kappa number of this cooking were very close to those found in mini-digestor reactions. The unbeaten pulps had a relatively high Shopper degree (59°SR) and the drainage was slow when the paper sheets were made. These papers showed good physical mechanical properties. The high basis weight was submitted to test which are specific to corrugated boards and showed very interesting values of RCT, CMf and FCT.
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[Poster Presentation] IS THE EXTRACTIVES PLAY ANY POLE IN COLORING PULPS FROM Pinus pinaster?
C.Baptista,M.N.Belgacem,A.P.Duarte 한국펄프·종이공학회 1999 한국펄프종이학회 기타 간행물 Vol.- No.-
Pulps from Pinus pinaster were obtained using classical and modified kraft processes of pulping with the aim objective of establishing whether the extractives contribute in inducing the dark colour of the unbleached pulps from this specie. The methodology adopted here was based on carrying out two set of experiments. The first one consisted on cooking extractive-free wood chips whereas the second one was devoted to the pulping of wood in the presence of a surfactant. The colour of the pulps thus obtained were compared to that of the pulps prepared from initial wood cooked without any modification. In the first set of experiments, the wood chips were submitted to extraction wit different solvents and acetone and toluene / ethanol appeared to be the most efficient, since the pulps obtained from wood previously extracted by this solvent showed that the brightness of pulps increased by more than 12% and the kappa number decreased by about 4 points. In second set of experiment, the wood chips were cooked in the presence of non-ionic surfactants from poly(ethylene), PEG, and poly(propylene) glycol PPG, homopolymers and copolymers with molecular weights ranging from 400 to<br/> 10000. The most promising tensio-active compounds<br/> were PEG and a block copolymer PEG-PPG-PEG with molecular weight of 1000 and 1100, respectively. The optimal concentration of the surfactants was about 4%. The kappa number of these pulps lowered significantly, i.e. from 50 for the reference to 39 for the pulps obtained by kraft cooking in the presence of 4% of PEG 1000.
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