Chemical morphological and pulping properties of some indigenous species Malaysia

Mohd Nor Mohd Yusoff, . and Azizol Abd Kadir, . (1992) Chemical morphological and pulping properties of some indigenous species Malaysia. [Proceedings Paper]

Laboratory investigations into the suitability of nearly 200 indigenous species as the raw material for pulp and paper have been evaluated since 1955. The wide range of species contributes to the heterogeneity of the physical and chemical properties which are reflected in the pulp and paper properties. The hardwood species for pulp are mostly short fibred with an average length of about 1.4 mm and a range of 0.7 to 3.3 mm. Species of comparable lignin contents having holocellulose greater than 70 and alphacellulose greater than 40 tend to produce sulphate pulp yields of 45 or more. Some species having high extractive contents such as Jelutong Dyera costulata and Keledang Artocarpus integer would cause excessive consumption of chemicals in pulping. The resinous species mainly the Keruings Dipterocarpus spp. are expected to give rise to pitch problems during pulping and papermaking. Pulping by the sulphate process on individual or mixed species was carried out in order to determine the optimum conditions of digestion with respect to chemical consumption pulp yields and properties. Generally it has been found that practically all the light density hardwoods 250-450 kg/m3 and a large proportion of medium density hardwoods 451-650 kg/m3 can be identified with thin cell walled short-fibred timbers producing pulp sheets with good inter-fibre bonding. These species would be suitable for printing writing and wrapping papers as well as liner board components. In contrast the heavy density hardwoods 651-850 kg/m3 associated with thick cell walled with low fibre flexibility would give rise to products that are bulky and low in strength properties.

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Abstract

Laboratory investigations into the suitability of nearly 200 indigenous species as the raw material for pulp and paper have been evaluated since 1955. The wide range of species contributes to the heterogeneity of the physical and chemical properties which are reflected in the pulp and paper properties. The hardwood species for pulp are mostly short fibred with an average length of about 1.4 mm and a range of 0.7 to 3.3 mm. Species of comparable lignin contents having holocellulose greater than 70 and alphacellulose greater than 40 tend to produce sulphate pulp yields of 45 or more. Some species having high extractive contents such as Jelutong Dyera costulata and Keledang Artocarpus integer would cause excessive consumption of chemicals in pulping. The resinous species mainly the Keruings Dipterocarpus spp. are expected to give rise to pitch problems during pulping and papermaking. Pulping by the sulphate process on individual or mixed species was carried out in order to determine the optimum conditions of digestion with respect to chemical consumption pulp yields and properties. Generally it has been found that practically all the light density hardwoods 250-450 kg/m3 and a large proportion of medium density hardwoods 451-650 kg/m3 can be identified with thin cell walled short-fibred timbers producing pulp sheets with good inter-fibre bonding. These species would be suitable for printing writing and wrapping papers as well as liner board components. In contrast the heavy density hardwoods 651-850 kg/m3 associated with thick cell walled with low fibre flexibility would give rise to products that are bulky and low in strength properties.

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Item Type:	Proceedings Paper
Additional Information:	Summary En
AGROVOC Term:	VARIEDADES INDIGENAS
AGROVOC Term:	PROPIEDADES FISICO-QUIMICAS
AGROVOC Term:	ELABORACION DE PULPA
AGROVOC Term:	MALASIA/ FIBRAS
AGROVOC Term:	PASTA
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:26
URI:	http://webagris.upm.edu.my/id/eprint/15106

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