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Kraft Pulping of Unretted Whole Jute Plant

Dr. K. Bhowmick,
Assistant Chemist (R&D).
Karnaphuli Paper Mills Ltd., Chandraghona, Rangamati Hill District, Bangladesh

Abstract/ Executive Summary:

Kraft pulping of whole jute plant without reting was conducted in the laboratory scale. Compared with kraft pulping of bamboo, the unbleached pulp yield with unretted jute plant was lower by about 3.0 percent points at the same point of delignification. The yield was lower by 17.0 percent points compared to kraft pulping of jute bast fibre. Jute plant pulp degraded severely on bleaching. However, the quality of unbleached pulp was almost similar to kraft bamboo pulp. Whole jute plant can thus replace bamboo in making paper which do not require bleaching.

Keywords: Whole Jute plant, Kraft pulping, Unretted, Kappa number, Strength properties

Location: Pulp and Paper Division, Bangladesh Forest Research Institute, Chittagong .

Start Date:

End Date:

Program Area: Postharvest and Agro-processing

Commodity: Jute

Objectives:

To find out whether unretted whole jute plant could be useful for pulp production.

Methodology:

The whole jute plants (Corchorus capsularis) were collected in green condition from Comilla. They were about 1-2.5 m in length. The plants were chopped to 4-5 cm length manually. These were then air-dried and stored in sealed polythene bags. The moisture content of the stock was determined by drying it in an oven at 105°C to a constant weight.The chips of whole jute plant and bamboo were cooked separately by the kraft process in a 20 l stationary digester. The digester was loaded with air-dry chip equivalent to 1,750 g of oven-dry chips. The cooking liquor was prepared by using mill white liquor. The cooking conditions for all the cooks were kept constant at 19% sulphidity, 1 : 4 material to liquor ratio, 90 minute to raise the temperature to 165^°C and cooked for 2 hours. The alkali charge was varied. After the end of the cook, the pressure inside the digester was released and the black liquor drained off. The cooked material was washed, disintegrated and then screened. The screened pulp was then pressed to remove excess water, shredded, weighed and then sampled to determine the moisture content. The screening rejects were ovendried and weighted. The pulp yield was then calculated. The screened pulp was analysed for permanganate number.The unbleached pulp samples were beaten in a laboratory Valley beater and standard handsheets were made. The sheets were tested for physical strength properties according to TAPPI Standard Methods. Fibre length of the pulp was determined with the pulp at a permanganate number of 14.Pulp from whole jute plant at a permanganate number of 14 was bleached at a five-stage CEHEH bleaching sequence. The bleached pulp was beaten and hand sheets were made for evaluating the strength properties.

Source of Information: Bano Biggyan Patrica Vol. 17 (1&2); 08-14, 1988.

Article Link (Online Journal):

Funding Source:

1. Government

Budget: 300000

Total Budget (Tk.) : 300000

Achievement/Findings:

Kraft pulping of jute plant can replace bamboo in making papers which do not require bleaching. Consequently, manufacture of wrapping papers and liners may be feasible from kraft jute plant pulp

Knowledge Management: Journal