Paper industry information

Whether it is coniferous pulp, or broadleaf pulp, the use is much lower than waste pulp. The recovery rate of foreign waste pulp is about 60-70% for a long time, and the recycling cycle of paper is relatively short, so the output of waste pulp is very large, but because of the "mixed" and difficult to deal with impurities, waste pulp is more made into corrugated paper and cardboard, and then folded into a variety of cartons, cartons, the largest downstream user is e-commerce express.

3. Non-wood pulp

Bamboo pulp: Bamboo is a perennial tufted plant, bamboo forest formation period is generally 3 years. Bamboo is closer to wood in material quality, and the content of silicon in bamboo is lower than other non-wood pulp raw materials. Because of the particularity of bamboo clustering, thinning can only be used for cutting. Due to the particularity of bamboo clusters, thinning must be used when harvesting, and the demand for labor is greater than that of wood and bagasse. With the continuous increase of labor costs, it will greatly affect the cost of bamboo raw materials.

The full resource value of bamboo is realized through the supply of bamboo shoots and bamboos. Generally speaking, for the same bamboo forest or bamboo species, increasing the yield of bamboo shoots will reduce the yield of bamboo, and vice versa. Bamboo shoots are more profitable than bamboo shoots, but also require more labor and care, and the production of bamboo is relatively less manual input.

From the type of bamboo, although the material of bamboo is very suitable for pulping and papermaking, but because of its wide use in industry, construction, furniture, crafts and other aspects, it is rarely used for pulping and papermaking due to price factors. Representative listed companies: Yibin Paper, Qingshan Paper

Reed: There are two main kinds of reed in China, namely reed and silver reed. The Yangtze River basin and its south are mainly reeds, the Yellow River basin and its north are mainly reeds, and the areas between the south of the Yellow River and the north of the Yangtze River are both reeds and reeds. The main uses of reed are reed handicraft products, animal feed, construction materials and fiber raw materials for pulp and paper. Among them, pulping and papermaking is the most important use of reed. Reeds are perennial plants, and winter is the harvest season every year, and the water content of reeds is the lowest season. Reed in non-wood pulping fiber raw materials, in terms of quality is second only to bamboo, its silicon content is higher than bamboo, but generally lower than bagasse and wheat grass and other agricultural straw. Compared with bamboo, the economic benefits of other uses of bamboo are more obvious, and the use of reed papermaking is very competitive.

The absolute dry solid content of fiber in sugarcane is about the same as the sugar content in sugarcane. Most of the sugar is sent to the sugar mills for the production of sucrose. Therefore, the annual yield of bagasse is basically equivalent to the annual yield of sucrose. Generally speaking, bagasse contains a certain amount of cane pulp, which should be removed before pulping, and the general pulp removal rate is 15%, which can be inferred that every 1 ton of cane sugar will produce 850 kilograms of bagasse for pulping and paper making. In addition to the use of bagasse for pulp and paper, there is a very small amount of high density fiberboard and furniture or decorative board. Guangxi, Yunnan and Guangdong are the main producing areas of sugarcane.

Wheatgrass: Grass fiber raw materials refer to a wide range of wheat, rice, corn and cotton straw, which is a waste of agricultural production. Grass fiber raw materials have high silicon content and serious pollution.

two. Classified by preparation method

Wood pulp is the main fiber source for paper making, usually made from wood chips by chemical or mechanical methods to remove the lignin from the wood and retain the cellulose and hemicellulose. According to the manufacturing method, it is divided into chemical pulp (including caustic soda pulp, sulfate pulp, sulfite pulp, etc.), mechanical pulp (including grinding stone wood pulp, disk mill mechanical pulp, hot mill mechanical pulp, etc.) and chemical mechanical pulp 3 categories; Pulp mills usually dry fiber suspension made from wood to form pulp plates for easy transportation. Paper mills in the papermaking process need to add water to dissociate the pulp plate in order to be used in production.

Chemical-mechanical wood pulp is a kind of wood pulp with high yield, and the yield can reach more than 90%. The production of one ton of chemical pulp requires about 1.1-1.2 tons of absolutely dry wood chips, and the production of 1 ton of chemical pulp requires about 2.1 tons of wood chips

chemi-mechanical pulp (CMP) includes:

A chemi-thermo-mechanical pulp CTMP;

B chemi-mechanical pulp CMP;

The chemical treatment conditions are mild, the pulp retains more lignin content in the raw material, and the pure pulp yield can be as high as 85% ~ 90%. The chemical mechanical pulp made of broadleaf wood is similar to that of softwood grinding wood pulp, with high paper compactness, low opacity, more long fiber content, less fiber bundle and good printability. It can be used to make newsprint, printing paper and cardboard. [1-2]