The hottest technological innovation has brought a

2022-07-19
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A technological innovation has brought a new life to the wet bamboo pulp papermaking enterprise. Release date: Source: China Paper Media Editor: Yu Jia Views: 2322 copyright and disclaimer core tips: in recent years, bamboo pulp household paper has become a new fashion, which can be clearly felt from the hot scene of the household paper exhibition held in Wuhan this year. Bamboo fiber contains "bamboo quinone", which can inhibit bacterial reproduction, so that bamboo pulp household paper can be kept clean even if it is exposed in the air for a long time, so it is not easy to breed bacteria. The air permeability of bamboo fiber is 3.5 times that of cotton, so bamboo pulp household paper has good air permeability

[China Packaging News] in recent years, bamboo pulp household paper has become a new fashion, which can be clearly felt from the hot scene of the household paper exhibition held in Wuhan this year. Bamboo fiber contains "bamboo quinone", which can inhibit bacterial reproduction, so that bamboo pulp household paper can be kept clean even if it is exposed in the air for a long time, so it is not easy to breed bacteria. The air permeability of bamboo fiber is 3.5 times that of cotton, so bamboo pulp household paper has good air permeability

due to the rapid growth of the market demand for bamboo pulp household paper, more and more bamboo pulp mills intend to give up the profit model of selling bamboo pulp board in the past and invest in household paper mills to directly turn pulp into paper. The production of toilet paper with pulp board has accumulated valuable experience in the whole Yunnan Guizhou Sichuan region in recent years, and the papermaking technology is also becoming mature. However, the production of toilet paper from wet bamboo pulp, especially natural color household paper, has just started, and there are still many problems

problem 1

wet pulp contains a large amount of uncooked raw pulp in the dehydration and drying process without pulp board during thermal processing, which forms a high dust degree. The dust degree of wet pulp in some pulp mills can reach 1000/m2, especially if the pulp washing process in pulp mills is not handled enough, which is particularly serious. However, even with the best screening, purification and pulp washing equipment, the problem of dust level cannot be completely solved. Dust brings great difficulties to the manufacture of toilet paper (household paper), especially high-speed paper machine. On the one hand, these dust spots are not easy to be scraped off by the scraper in the dryer, thus forming holes. On the other hand, more dust will form white spots or black spots (natural color paste) on the paper surface, and the "dust degree" index of the finished paper exceeds the standard. At present, in order to solve this problem, when using low consistency beating, the paper mill must make the investment strategy of beating in 2014 to SR, and the power consumption of beating is more than 300 degrees. The high beating degree not only increases the beating cost, but also brings great difficulties to the paper machine dehydration, such as welding technology, casting/casting technology, material mixing (die-casting products)/bonding technology and others; The rising cost of drying, the slow speed and the low loose thickness (the elongation of some wet pulp toilet paper factories reaches more than 40%) have greatly affected the production cost

problem 2

the wet pulp contains waste liquid that has not been cleaned. The water of these anionic components will increase the amount of chemicals when brought to the paper machine. Bamboo pulp is a gramineous plant, which contains a large number of miscellaneous cells. These miscellaneous cells have not been effectively removed in the wet pulp. Most of them have been defeated by beating with low concentration and high specific pressure, resulting in poor hand feel of toilet paper

this is also why Hainan jinhongye needs to use the wet pulp from Jinhai Pulp Plant to concentrate the wet pulp to about 30% through a double roll extruder, then dilute the pulp, send it to grinding or papermaking, and return the extruded water directly to the pulp plant

puzzle 3

due to the relatively hard cell wall of bamboo pulp, the drying process can help soften the fiber to a certain extent. However, the wet pulp fiber is very hard. It needs to be beaten to a higher beating degree to make toilet paper, otherwise the paper surface feels rough

"new process solves new problems"

through years of technology research and development and the practice of paper-making enterprises, Changsha Zhengda light technology paper equipment Co., Ltd., the leader and innovator of domestic medium and high consistency beating system integration suppliers, has designed a new process system to effectively solve the problems of low consistency beating in view of the difficulties of wet bamboo pulp in making household paper, combined with the advantages of high and low consistency beating

solve the problem that a large amount of uncooked raw pulp is kneaded and extruded by high consistency grinding to separate the agglomerated or bunched fibers, and these dust can be easily "dissolved" with low power consumption. With single-stage high consistency grinding, even if the dust degree of the original pulp is as high as 800/㎡, the dust can be basically removed only through the power consumption of kwh. In addition, the total power consumption of kwh per ton of pulp in the later stage of low consistency beating can reach "0". It greatly reduces the power consumption of beating, improves the water filtering performance of the fiber, and greatly improves the papermaking performance of the paper machine. Generally, it needs to be replaced every 6 months, improves the loose thickness (elongation is reduced to less than 30%), and improves the unit output

solve the problem of the concentration equipment before the second high consistency beating, increase the wet pulp concentration to%, so that the water containing anionic components and miscellaneous cells can be returned to the pulp plant instead of being brought to the paper machine system, cleaning the paper machine environment. At the same time, high consistency beating mainly depends on the interaction between fibers rather than the effect of non-metallic grinding plate on fibers, which does not damage the miscellaneous cells and is also conducive to the hand feel of paper

solve the problem that the three high consistency beating can fully soften the fiber by kneading and extruding the fiber, which has obvious advantages in improving the softness and smoothness of bamboo fiber. At the same time, the bending and kink formed in the process of fiber kneading and extrusion also has an obvious effect on improving the loose thickness and flexibility of the paper

compared with the pure low concentration process, the new process of high concentration plus low concentration has the following obvious effects:

(1) the power consumption per ton of pulp is reduced by kwh/t

(2) the upper rapping degree decreased Sr, the loose thickness increased%, and the elongation decreased%

(3) the softness and smoothness of the finished paper were significantly improved

(4) it can reduce the fiber loss, reduce the white water concentration by about 25%, and increase the monolayer retention rate by about 10%

(5) after reducing the beating degree, the longitudinal fracture length can be increased by% and the transverse fracture length can be increased by%

(6) the fiber is fully separated and broomed by high consistency beating, which can improve the adhesion of the fiber, improve the adsorption effect on the chemical agent, and reduce the use of the chemical agent

enterprise application case Changsha Zhengda Light Technology Co., Ltd. is applicable to the high consistency beating system for bamboo pulp to make high-grade household paper. Since its R & D and promotion, the first one to apply the wet pulp treatment of bamboo pulp is one of the top 10 enterprises in China's paper industry, and the leader in bamboo fiber household paper industry, Liwen paper. When Liwen was preparing to use bamboo wet pulp for papermaking, after industry technical research, there were almost no successful cases of high-speed machines in China. However, the new solution provided by Changsha Zhengda Light Technology Co., Ltd. has not yet had a mature use case in China. Through repeated laboratory experiments and large-scale production trials, Liwen paper factory has made a decisive and bold choice, which reflects the leadership style of an industry leader who has the courage to try new technologies. At the time of the first system, Andritz's low consistency refining equipment was installed in the production line. After repeated comparison and copying, it was found that compared with the process of high consistency plus low consistency, the traditional low consistency beating simply could not make a toilet paper with low dust, soft hand feel and good loose thickness under low beating degree. Liwen company made a decisive decision for the extremely sensitive cost and quality, After that, six high consistency equipment were installed continuously to support all high-speed toilet paper machines. At present, the quality of "henqi" brand bamboo fiber household paper is not inferior to that of all wood pulp products, and has successfully entered the high-end market of household paper

Chongqing Liwen paper project site

in the second half of last year, there was another good news from Sichuan Province. Sichuan Qianwei Fengsheng Paper Co., Ltd. purchased two sets of high consistency beater systems from Changsha Zhengda Light Technology Co., Ltd. at the beginning of 2016 for processing wet bamboo pulp to produce household paper, which has been put into operation. Compared with peers, it has obvious competitive advantages in product quality and production cost, It also helped the enterprise successfully extend from the development of bamboo pulp producers to the downstream industry of papermaking, and formed a bamboo pulp household paper industry chain of "bleached bamboo pulp - household paper base paper - high-grade household paper"

Sichuan Qianwei Fengsheng paper industry project site

as more and more bamboo pulp household paper is loved by the majority of consumers, more and more bamboo pulp factories will devote themselves to the cause of toilet paper. Perhaps in the near future, bamboo pulp will no longer have pulp board to make toilet paper. Through the technological innovation of high concentration plus low concentration process of Changsha Zhengda Light Industry Equipment Co., Ltd., the successful solution of the wet bamboo pulp process problem will greatly help China's bamboo pulp mills to successfully transform into sanitary paper mills. We also look forward to the rise of more bamboo pulp and paper enterprises

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