Low pressure blast pulping method in palm fiber

Abstract

This invention discloses a low blasting pulp making method in palm fibre. It includes material pretreatment, that is alkali, and sodium-sulfur compound and water are added into palm fibre materials. The bone dry weight percentage is that alkali 0-10%, sodium-sulfur compound 0-16% and water that can make liquid ratio to 0.5-3, then they are placed for 0-24 hours after uniformly blended. Then the materials after pretreatment are low pressure proposed and discharged. The advantages are low cost, low temperature, and low damage to fiber. The waste water after pulp making can be used as fertilizer for crop irrigation, low pollution high gain ratio. It can be used to make high strength card board, corrugated board, writing paper, manifold paper and other culture using paper.

Description

technical field [0001] The invention relates to the field of papermaking and pulping, in particular to a medium-low pressure explosion pulping method for palm fiber. Background technique [0002] The consumption of paper and pulp in the world increases rapidly with the development of economy, but the available wood fiber raw materials are less and less. This contradiction changes with the increase of population and the steady economic development of developing countries such as China and India. more sharply. The paper industry is facing two major tasks: one is to increase the product conversion rate of fiber raw materials; the other is to develop new clean production technologies to utilize new fiber raw material resources. [0003] As an important economic crop in Southeast Asia, especially Malaysia, Indonesia and other countries, palm trees have a huge output of by-product fiber raw materials. The main types include: stems, leaf fibers, husk fibers, and empty fruit fiber ...

AI Technical Summary

Problems solved by technology

However, for palm fiber raw materials, these two types of pulping methods have the following problems: chemical pulping has disadvantages such as high consumption of medicines, low product yield, difficult wastewater treatment, large fixed investment, and high product cost; Disadvantages such as high energy consumption, poor pulp strength, and relatively high cost

Through further research on these two types of explosive pulping methods, and especially for palm fiber, it is found that there are following shortcomings: (1) the above-mentioned invention does not control the liquid ratio, and the liquid ratio control is the key to the pulping quality of the explosive method, and the liquid ratio is too high. Large, consumes a lot of steam, especially when the fiber bundle is surrounded by water at the moment of blasting, the internal structure of the fiber does not change significantly, resulting in poor blasting effect; if the liquid ratio is too small, the fiber bundle is easily oxidized by high temperature, resulting in blackened and brittle pulp; Both situations lead to fluctuations in pulp quality and low pulp strength

(2) The temperature and pressure of the above-mentioned invention are consistent during the treatment cycle. If the temperature and pressure are too high, the pulp will become black and brittle, which is very sensitive to the treatment time, and the product quality is difficult to control; if the temperature and pressure are low, the palm fiber will be dissociated during blasting. The degree is not high, the palm fiber is easy to clog during the conveying process and refining, and the processing time is long, and the pulp strength is low