Future technological development direction of pulp and paper industry

There are two technologies that belong to this concept: one is steam flow paper making, which is a production method that is very close to waterless paper making. The mostly dry fibers are blown to the forming area using steam stirring and subsequently settled into a web. The required water consumption is only equivalent to the current l / 1000. The second is the paper pulp curing technology, which is also a papermaking process technology with little water. The treated fiber is sent into a viscous solution to make a suspension with a concentration of more than 40%, and finally the solution is pressed out, and the fiber layer is solidified into a paper page by an auxiliary agent. Choose different auxiliaries according to different paper types.

(3) The technical concept of paper lightweight

Producing more products with less fiber, obtaining greater added value, and producing low-quantity products is one of the keys. Advances in page forming technology and raw material mixing technology will make future paper products more lightweight.

The paper is lighter, but the performance, especially the strength, remains the same, and also depends on the role of chemicals, and the application of chemicals is the key. In addition to solving the problems of page forming and mixing with chemicals, it is also necessary to solve the preparation of green chemicals.

(4) Nano-cellulose

Nanocellulose forms a stable colloidal suspension in water and can be mixed with thickeners and emulsifiers for application.

Plant fibers can be used to develop and produce nanocellulose products. Compared with other fibers, plant fibers have an inherent tendency to form thin films due to their high aspect ratio, high specific surface area and enhanced hydrogen bonding ability.

The advantages of nanocellulose solutions have been widely demonstrated. It can be predicted that this special material series of nanocellulose products can be used in paper, food, cosmetics, coatings, and can also be expected to be applied in electronics, medical and pharmaceutical applications, which will generate new huge business opportunities. The research on this kind of nanomaterials in the process of commercialization has made great achievements.

(5) Biomass refining technology

Put forward the concept of transformation and upgrading of pulp and paper, and will continue to pay attention to the sustainable development of woody biomass components. As the role of ionic liquids together with enzymes in lignocellulosic processing has been studied, various cellulose, hemicellulose, lignin derivatives and compositions have been developed for use in such materials as films, barrier agents, adsorbents, adhesives and composites.

(6) Put forward the concept of "paper machine doctor"

At present, the production capacity, speed and width of the paper machine that can be designed and produced by the equipment manufacturing industry have fully met the needs of the industry, and the diagnosis, maintenance and repair of the modern paper machine in operation have been mentioned in an important position, so the concept of "paper machine doctor" is proposed in the field of science and technology to ensure the normal operation of the existing paper machine and adapt to the new requirements.

1.2 North America

North America still regards energy saving, consumption reduction, carbon emission reduction, and transformation and upgrading of pulp and paper enterprises through biomass refining technology as the focus of future engineering technology.

(1) Energy saving. The energy consumption of the paper industry in the United States accounts for 10.5% of the total industrial energy consumption, which is one of the four energy consuming industries, and energy saving is the goal of key research and development technologies. Such as: ① Under the condition of ensuring the quality of the paper page, through the improvement of the dehydration press technology, the dryness of the paper page entering the drying part can reach 65%, an increase of 10% to 15%. ② Develop a new generation of pulp grinding machine to improve the yield of chemical pulp, reduce unit energy consumption by 20%, such as the use of biological enzyme pretreatment, heat recovery technology. ③ By increasing the concentration of black liquid washing, evaporation concentration and the concentration of entering the recovery furnace, the energy consumption of black liquid alkali recovery can be reduced by 50%.

(2) Reduce water consumption. Reduce water consumption by 50% through the development and implementation of new technologies for 100% recycling of wastewater. Focus on research and development of clean separation technology of pollutants in wastewater.

(3) Efficient and high-value utilization of plant resources. ① Improve the yield of chemical pulp and dissolved pulp, of which the yield of chemical pulp should reach 90% and above. ② Efficient use of wood waste and production process waste, put forward the concept of "biomass full component utilization". The specific technical scope of the biomass refining technology is similar to the woody biomass refining technology proposed by the European Paper Industry Alliance. ④ Study on high-value utilization of cellulose. In recent years, high value applications of Cellulose derivatives such as Cellulose Nanocrystal (CNC) or Cellulose Nanofibrils (CNF) have been developed.