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Hardboard Making Characteristics of Fifteen Lesser Used/unused Medium Density Hardwood Species of Bangladesh.

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

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

Abstract/ Executive Summary:

A study was conducted with 15 lesser used/unused medium density (0.52-0.68) wood species of Bangladesh to determine their hardboard making characteristics. The species tested were barta (Artocarpus lakoocha), chalta (Dillenia indica), dakroom (Mitragyna rotundifolia), gab (Diospyros peregrine), hargaza (Dillenia pentagyna), jhumka bhadi (Engelhardtia spicata)kamdev (Calophyllum polyanthum), kao (Garcinai cowa), Kasturi (Cinnamomum cecidodaplunc) kerung (Pongamia pinnata), moos (Pterospermum acerifolium) pairan (Canarium risiniferum), rata (Aphanamixis polystachya), tali (Palaguium polyanthum) and uriam (Mangifera sylvatica) It was found that all the species except barta, kasturi and uriam produced good for even better quality hardboard than that of sundry (Heritiera fomes) a widely used wood species in Khulna Hardboard Mills.

Keywords: Bangladesh, Hardboard, Lesser used/unused wood, Water resistance, Strength properties.

Location: Bangladesh Forest Research Institute, Chittagong.

Start Date:

End Date:

Program Area: Postharvest and Agro-processing

Commodity: Wood

Objectives:

To determine the suitability of fifteen lesser used or unused wood species for making hardboard.

Methodology:

Logs of 15 lesser used/unused medium density wood species, namely barta (Artocarpus lakoocha), chalta (Dillenia indica), dakroom (Mitragyna rotundifolia), gab (Diospyros peregrine), hargaza (Dillenia pentagyna), jhumka bhadi (Engelhardtia spicata) kamdev (Calophyllum polyanthum), kao (Garcinai cowa), Kasturi (Cinnamomum cecidodaplunc) kerung (Pongamia pinnata), moos (Pterospermum acerifolium) pairag (Canarium risiniferum), rata (Aphanamixis polystachya) tali (Palaguium polyanthum) and uriam (Mangifera sylvatica) were sawn and chipped. The Chips were air-dried and steamed for one hour at 10 kg/cm²pressure. The steamed chips were then defiberized in a single rotating disc attrition mill. Pulps were made at different freenesses from each species by varying the plate clearance of the attrition mill.Hardboard mats were formed in a mat former-cum-freeness tester and freeness was recorded. The consistency of the pulp slurry was such that the mat would ultimately make a hardboard disc of about 21.6 cm diameter, 3.175 mm nominal thickness and nearly 1000 kg/m³ density.The mats were cold pressed to remove excess water prior to hot pressing. The prepressed mats were finally consolidated between the cauls of a hydraulic hotpress at about 190°C temperature and 35 kg/ cm² pressure. Hot pressing was done for six minutes including a one minute breathing time at a low pressure of 7 kg/cm² after the first two 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) board. The boards were tested for determining their strength and water-resistance properties.Test samples of 12.7 cm x 5.08 cm size were prepared from each board and conditioned for 72 hours at 50 ±1% RH and 23±2°C temperature. .The strength and water absorption tests were done with the sample ASTM Standard.

Source of Information: Bangladesh Journal of Forest Science Vol. 28 (1); 59-63,1999.

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Barta : The pulps produced weak hardboards.

Chalta : The pulps make sufficiently strong and water resistant hardboards.

Dakroom : The pulps give fairly strong and good water resistant hardboards.

Gab : The pulps produce strong and good water resistant hardboards.

Hargaza : Hardboards are very strong and fairly water resistant

Jhumka bhadi : The pulps are somewhat slow draining giving strong and fairly water resistant hardboards.

Kamdev : Hardboards are very strong and fairly water resistant.

Kao : The pulps give strong hardboards and good water resistant properties.

Kasturi : The pulps give weak hardboards with fair water resistant properties.

Kerung : Hardboards made are strong with fair water resistant properties.

Moos : The pulps give strong hardboards but with poor water resistant properties.

Paikrag : The pulps are free producing weak and fairly water resistant.

Rata : The pulps are fairly free. Hardboards are strong and fairly water resistant.

Tali : The pulps are quite free giving strong and water resistant hardboards.

Uriam : The pulps are slow draining producing weak and fairly water resistant hardboards

Knowledge Management: Journal