Influence of Permeability on Pulping Behavior of Tropical Indian Hardwoods

Authors

  • Satish Kumar
  • Man Mohan Singh
  • P. B. Dobriyal
  • Sonya Bahri

Keywords:

Hardwoods, permeability, diffusion, composite permeability, suitability indices, wood structure, pulping

Abstract

In this paper, an attempt has been made to correlate pulping of six tropical Indian hardwoods with their permeability and penetration behavior.

A poor correlation existed between pulping suitability indices and directional permeability. Pulping suitability indices were found to be poorly correlated even with the composite permeability of wood, indicated by loading of cooking chemicals into wood under pressure. Composite permeability of wood was found to have a good correlation with pulp yield. High composite permeability, an index of good penetration of the cells, always resulted in lower yield losses, e.g., in udal and kokko. A medium permeability resulted in medium yield (maharukh). A poor composite permeability resulting from poor penetration of the cells, despite high gas permeability in some cases (chilauni, eucalyptus, toon) resulted in higher carbohydrate losses.

References

Backman, A. 1946. Influence of chip thickness on yield and quality of chemical pulp in cooking trials with chips in the form of parallel-pipeds. Papp. Trav. Tids. (Finland) 28(13):200 (F.A. 1724, 1948).nBains, B. S., and S. Kumar. 1979. Diffusion through bamboos. III Ionic selectivity and temperature effects. J. Timb. Dev. Assoc. (India) 25(4):34-44.nChoong, E. T., C. W. McMillan, and F. O. Tesoro. 1975. Effect of surface preparation on gas permeability of wood. Wood Sci. 7(4):319-322.nGalvao, A. P. M., J. F. Siau, and C. Skaar. 1974. Factors influencing the transient flow of oils into coniferous woods. Wood Sci. 7(2):85-91.nGuha, S. R. D. 1969. Fibrous raw materials for paper making. IPPTA Souvenir 6(5):38-39.nHartler, N. 1962. Penetration and diffusion conditions for sulphate cooking. Papper Och. Tra. No. 7:365-374.nHatton, J. V. 1972. A proposed chip classification in Kraft pulping by means of liquor accessibility factors. WFPL (Canada) Report VP-X. 96.nHatton, J. V. 1978a. Effect of chip size on the Kraft pulping of Canadian hardwoods. Transactions 79(6):49-55.nHatton, J. V. 1978b. Effect of chip thickness on the delignification of hardwoods by Kraft process. Transactions 79(6):55-62.nIndian Standards Institution. 1982. Code of practice for preservation of timber. I.S. 401, New Delhi.nKumar, S. 1979. Validity of Darcy flow equation for gas flow through wood in axial penetration. J. Timb. Dev. Assoc. (India) 25(3):17-41.nKumar, S. 1980. Expanding wood supply through improved technology and utilisation. Paper Pulp Forest Prod. J. 1(1):13-31.nKumar, S. and B. B. Chaubey. 1987. Studies on permeability variation within tropical Indian hardwoods: Effect of specific gravity and moisture content. J. Timb. Dev. Assoc. (India) 33(1):35-50.nKumar, S. and A. Purushotham. 1972. Diffusion through wood II Effect or temperature. J. Timb. Dev. Assoc. (India) 18(1):24-29.nMisra, N. D. 1972. Fibrous raw materials shortage—A challenge to Indian technologists. IPPTA 9(3):279.nParanyi, N. I., and W. Rabinovitch. 1955. Determination of penetration rate of liquid media into wood using a quartz spiral balance. Part I. Water and an air dry spruce chip. Pulp Paper Mag. Canada 56(3):163-170.nSingh, M. M., and P. P. Bhola. 1976. Comparative suitability of hardwoods for paper making. Holzforsch. Holzverw. 28(6):137-140.nStone, J. E. 1956. The penetrability of wood. Pulp Paper Mag. Canada 57(7):139-145.nStone, J. E. and H. V. Green. 1958. Penetration and diffusion into hardwoods. Pulp Paper Mag. Canada 59(10):223-232.nStone, J. E. and H. V. Green. 1959. Penetration and diffusion into hardwoods. Tappi 42(8):700-709.nYao, J. 1966. A new approach to the study of drying diffusion coefficients of wood. Forest Prod. J. 16(6):60-61.n

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Published

2007-06-22

Issue

Number 1 / January 1988

Section

Research Contributions

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