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Suitability of Village Tree Species of Bangladesh for Hardboard Manufacture.

Mr. M. S. Khan
Senior Research Officer
Pulp and paper Division, Bangladesh Forest Research Institute, P. O. Box 273, Chittagong-4000, Bangladesh

Dr. M. Shafi
Field investigator
Pulp and paper Division, Bangladesh Forest Research Institute, P. O. Box 273, Chittagong-4000, Bangladesh

Abstract/ Executive Summary:

Nine tree species growing in the villages of Bangladesh were studied to determine their suitability for making hardboard. Hardboards were made on defiberizing the pre-steamed chips mechanically. Strength and water resistance properties of the boards were determined. It was found that none of the species could make hardboards good enough to meet the requirements of class-1 hardboard of the US Hardboard Association Specifications. Nevertheless, all the species except neem, produced good, or even better, hardboards compared with sundry used in Khulna Hardboard Mills.

Keywords: Suitability, Hardboard, Village trees

Location: Bangladesh Forest Research Institute, Chittagong.

Start Date:

End Date:

Program Area: Postharvest and Agro-processing

Commodity: Tree

Objectives:

To determine the suitability of nine village grown wood species for hardboard manufacture.

Methodology:

The Chips of mango (Mangifera indica), jackfruit (Artocarpus heterophyllus), neem (Azadirachta indica), raintree (Samanea saman) babla (Acacia nilotica), shisham (Dalbergia sissoo), pannya mandar (Erythrina fusca), mandar (Erythrina orientalis) and tentul (Tamarindus indica) were air dried and cooked in steam for one hour at 10 kg/cm² pressure. The steamed chips were then defiberized in a single rotating disc attrition mill. Attempts were made to obtain pulps at three different free nesses.Mats were formed in a matformer-cum-freeness tester from 10 litre volume of pulp slurries, each containing 128 g oven dry pulp in water, and the pulp freeness was noted everytime. The consistency of the pulp slurry was such that the mat would ultimately made a hardboard disc of about 21.6 cm diameter, 3.175 mm nominal thickness and nearly 1040 kg/m³ density.The mats were cold pressed prior to hot pressing. The prepressed mats were finally consolidated between the cauls of a hydraulic hot press at about 190°C temperature and 35 kg/cm² pressure. Hot pressing was done for 6 minutes including a one minute breathing time at a low pressure of 7 kg/cm² after the first 2 minutes to allow the entrapped steam to escape from inside the mat. Also a 20 mesh wire net was placed underneath the mat to ease water removal during pressing. Thus wet felted smooth one side (S-1-S) hardboard discs were made .At least 15 boards, taking 5 boards from each of the three pulps made with a species were tested. Ten samples of 12.7 cm X 5.08 cm size were prepared and conditioned for 72 hours at 50 ±1% R.H. and 23± 2°C temperature in a humidity control room. Modulus of rupture (MOR) was determined by static bending process and water absorption tests were done with the samples ac.

Source of Information: Bangladesh Journal of Forest Science Vol. 24 (1); 36-40, 1995.

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Mango : The pulps tend to be somewhat slow draining. Hardboards are strong and fairly water resistant.

Jackfruit : The pulps are fairly free. Strong boards can be made only from fine grade pulps which are a bit slow draining. The boards are fairly water resistant.

Mandar : The species being a light hardwood, it produces fluffy mass of quite free pulps. The boards are bright coloured and strong but not water resistant.

Neem : The pulps are fairly free and dark producing hardboards of almost no strength.

Raintree : The pulps are slow draining capable of making fairly strong and water resistant hardboards from less free finer grade pulps.

Babla : The pulps are fairly free. The hardboards are sufficiently strong and fairly water resistant.

Shisham : The pulps are free and make strong hardboards with good water resistance properties.

Pannya mandar : The pulps are quite free giving strong and fairly water resistant hardboards.

Tentul : The pulps are too slow draining. The hardboards are, however, strong and water resistant.

Knowledge Management: Journal