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Pulping characteristics of Pinus caribaea var. hondurensis and Pinus oocarpa grown in Zimbabwe (ODNRI Bulletin No. 7)

Pulping characteristics of Pinus caribaea var. hondurensis and Pinus oocarpa grown in Zimbabwe (ODNRI Bulletin No. 7)

Palmer, E.R., Gibbs, J.A. and Dutta, A.P. (1988) Pulping characteristics of Pinus caribaea var. hondurensis and Pinus oocarpa grown in Zimbabwe (ODNRI Bulletin No. 7). [Working Paper]

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Abstract

Three samples of Pinus caribaea var. hondurensis and four of Pinus oocarpa grown in Zimbabwe over an altitudinal range of 700 m to 1 300 m were examined to determine their suitability for the production of papermaking pulps. Details of growing conditions, climate and rate of growth are reported. The wood density of P. caribaea decreased with increased altitude of the growing site: altitude had no effect on the wood density of the samples of P. oocarpa. Both species were pulped by the sulphate process, P. caribaea yielding 45% and P. oocarpa 46% of pulp with a kappa number of 40. There was little difference in tensile and bursting strengths of pulps from any of the samples. P. caribaea grown at low altitudes had the highest tearing strength and with this species tearing strength decreased with increasing altitude of the growing site. P. oocarpa yielded pulp with a tearing strength similar to that of P. caribaea from the middle altitude and altitude had no influence on pulp quality of this species. All samples were pulped by the Refiner Mechanical and Thermal Refiner Mechanical processes and yielded pulps suitable for use in newsprint.

Item Type: Working Paper
Additional Information: [1] ISBN: 0 85954 233-5.
Uncontrolled Keywords: pulping characteristics, pinus caribaea, hondurensis, pinus oocarpa, Zimbabwe, papermaking, handicrafts
Subjects: S Agriculture > S Agriculture (General)
Faculty / Department / Research Group: Faculty of Engineering & Science > Natural Resources Institute
Faculty of Engineering & Science > Natural Resources Institute > Food & Markets Department
Related URLs:
Last Modified: 06 Mar 2014 11:47
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/11049

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