世界木材制浆造纸工业技术发展趋势

The Development Tendency of Wood Pulping and Paper Making Industry in the Wold

林业是制浆造纸工业的基础,纸和纸板是高效益的林产品之一。随着科学技术的进步,制浆造纸工业已成为高技术工业。本文介绍了制浆造纸的原料问题和4种主要的制浆方法,并对制浆造纸工业技术的发展趋势进行了预测。

Pulping and paper making industry is an enterprise using plant fiber as the main material in production. As to material of softwood, priority is set on the southern pine. Ofthe hardwood species, Eucalyptus sp., Populus sp. and Betula sp. are utilized. At presenttime sulfate pulping is the most important pulping method. When this method is used, rawmaterials are easy to be procured, pulp quality is better, paper strength is high, chemicals areeasy to be recovered, and less energy is consumed. The defect is that the yield is less than50%. The other methods are pulping with polysulfide, s--free pulping, CTMP pulping, al-cohol pulping, esterized pulping, and acetic acid pulping. Of all the pulping methods, CT-MP method is a modified TMP method to produce defibrated mechanical pulp. The papermade of this pulp has higher thickness and opacity and dimensional stability. Moreover it issold at low price. Bleaching sequence of pulp can be shortened by using oxygen, ozone andperoxide which can reduce pollution by waste liquor and decrease energy consumption. Thepulping and paper making has now become hi--tech industry.