Pulp and paper
Hossein Resalati; Mostafa Nikkhah Dafchahi
Abstract
Due to shortage of harvestable forest wood in Iran, the potential of CMP pulp production from various species of salix (alba, fragilis and aegyptica), in comparison with populus deltoides, was investigated across this research work. The cooking liqour of Mazandaran wood and paper Mill, consisting of ...
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Due to shortage of harvestable forest wood in Iran, the potential of CMP pulp production from various species of salix (alba, fragilis and aegyptica), in comparison with populus deltoides, was investigated across this research work. The cooking liqour of Mazandaran wood and paper Mill, consisting of 50:50 ratios of sodium sulfite and sodium bisulfite, and hydrogen peroxide, were used for Chemical treatment and bleaching of the pulps, respectively. The results showed that the paper pulps of fragilis salix and alba salix had higher bulk and lower opacity than other species, respectively. From the strength properties point of view, the highest and lowest tensile strength of produced papers were related to alba and fragilis species, and, the highest and lowest burst and tear strength of the prepared papers have belonged to Salix aegyptica and Populus species, respectively. The data have shown that Salix species have a good pothential to be used as raw material to produce CMP pulp at the cooking yield of 85%. According to the results of this research work, alba salix and aegyptica salix are in first and the second priority to produce CMP pulp ,at the cooking yield of 85%, respectively.
Pulp and paper
Maryam Alipoor; Ghasem Asadpur Atouei; Seaid Majid Zabihzadeh; Zohreh Ghazvini
Abstract
With considering that in chemical-mechanical pulp (CMP) production process , the wood chips washing pre-treatment is important , so this research was conducted to investigate the effect of pre-treatment washing of populous deltoids wood chips on CMP Optical(brightness and opacity) and Strength(tensile ...
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With considering that in chemical-mechanical pulp (CMP) production process , the wood chips washing pre-treatment is important , so this research was conducted to investigate the effect of pre-treatment washing of populous deltoids wood chips on CMP Optical(brightness and opacity) and Strength(tensile and burst indexes) properties. Pre-treatment was accomplished with pure hot water and alkaline solutions (NaOH) at three levels of 0.5, 2 and 3.5 percent too. Pre-treated populous deltoids wood chips and control (chips without washing) were converted to pulp by CMP process. The results of this research indicated that the pretreatment of populous deltoids wood chips with hot water and also alkaline solutions caused wood chips mass and using of these treated chips for pulping caused pulp yield and brightness increscent, pulp strength reduction and also energy consumption increscent. . Removing of some part of chips hemicellulos have negative effect on the pulp refinability and cause pulp strength reduction.
Pulp and paper
Jaber Hossein zade; Ali Abdolkhani; Mohammad Emami nasab; Hamid Khodabandeh lo; Mohammad Ahmadi
Abstract
In this research Tension Wood (TW) and Normal Wood (NW) of Poplar were analyzed for pulp production using Kraft pulping process. After preparing samples, Biometric characteristics of the NW and TW fibers were measured and samples were converted to pulp. Pulp hand sheets mechanical and physical properties ...
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In this research Tension Wood (TW) and Normal Wood (NW) of Poplar were analyzed for pulp production using Kraft pulping process. After preparing samples, Biometric characteristics of the NW and TW fibers were measured and samples were converted to pulp. Pulp hand sheets mechanical and physical properties were measured and results were showed that NW fibers compared to TW fibers had a higher Rankle coefficient and aspect ratio. However the flexibility of NW fibers was better than TW fibers. Based on Results, although TW pulp yield was 13 percent greater than NW pulp yield but kappa number in TW was 45 percent lower than NW. Mechanical and physical properties of hand sheets indicated that the tensile and burst strengths of tension wood were comparatively lower than that of normal wood. Also the papers produced by equally mixture of TW fibers and NW fibers were showed higher tensile and burst strengths. Optical and color analyses of samples were showed an improvement in brightness and whiteness for TW hand sheets compared to NW papers. General speaking results were showed that presence of TW fibers inside pulp had not a significant effect on quality of produced pulp and papers.
Composite wood products
Abdolrahman Hosseinzadeh; Amir Nourbakhsh; Fardad Golbabaei; Abolfazl Kargarfard; Homayon Solimani ashtiani
Abstract
In order to manufacture particleboard from various populus clones species grown in four years short - rotation, eighteen clones from different species of populus grown in "Alborz Research Center" with a control sample of Beech from Caspian Forests totally 19 combination spicement were collected and 3 ...
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In order to manufacture particleboard from various populus clones species grown in four years short - rotation, eighteen clones from different species of populus grown in "Alborz Research Center" with a control sample of Beech from Caspian Forests totally 19 combination spicement were collected and 3 boards from each treatment totally 57 experimental sample boards were produced.The effects of different species and clones of populus on physical and mechanical properties of boards were studied. The results showed that clones P.d 77.51 and P.e.561.41 grown four years had the maximum modulus of repture (MaR). The P.e. 561.41, P.e. vernirubensis showed a high modulus of elasticity (MOE), and internal bonding (IB) was the maximum in P.d. 44.9, P.n. 63.135. The minimum amount of thickness swelling after 2 hours - immersion were belong to P.d. 77.51, P.n. 42.78 and the thickness swelling after 24 hours immersion were belong to P.n. 63.135 , P.e. 42.78. respectively.It has been shown that most of the different populous clones grown four years - rotation, have the higher applicable properties than control sample for particleboard.The results of this study showed that it is possible to use 4-years-old wood of P.e. 561.41, P.d. 77.51, P.e vernirubensis, P.n. 63.135, P.e. 44.9 woods for particleboard manufacture.
