Exploration and Identification of Alternative Raw Materials for Paper and Newsprint Manufacture: The Collection, Preparation and Pulping of Mixed Hardwoods from the Central Indian Forest (Bastar Region), Laboratory Study-Part I

摘要

This progress report describes in some detail the procedures used in collecting samples from the forest area, and preparing chip samples representative of certain species and diameter classes. Samples of 29 hardwood species were collected in four diameter classes (0-10 cm, 11-30 cm, 31-50 cm and above) from six sampling blocks. At the time of chipping all the samples were green and no difficulty was experienced with chipping. Pulping and bleaching experiments were initially started with four problem species (Terminalia tomentosa, Diospyros melanoxylon, Madhuca latifolia and Dalbergio panticulare). All four species could be pulped satisfactorily and the bleaching could be conducted adjusting the conditions to suit the pulp using CEHH sequence. Diameter class 3, representing bulk volume of hardwoods, was pulped and bleached, and no serious difficulties were encountered. The black liquor of various samples was tested for viscosity and precipitation after evaporation to various concentrations.