The development stage
Recalling the development process of pulping equipment industry twists and turns, can be divided into three stages. The first stage is to lay the foundation, the initial completion of the equipment manufacturing industry layout stage, the formation of Shanghai, Xi’an, Liaoyang three main plant reasonable layout, in the 60’s has successfully produced 3150 newsprint machine. The second stage is in the former State Economic and Trade Commission and the State Light Industry Bureau led, driven by the implementation of nearly 10 technical and trade projects in key equipment and areas to narrow the gap between foreign advanced equipment, laid the foundation for rapid development. The third stage is the rapid development and catch-up phase. Pulp and papermaking equipment manufacturing industry has made remarkable achievements, but due to late start, poor foundation, lack of investment, and international Andritz, Metso, Voith three giants compared to the huge gap.
The main features
In general, after decades of development, domestic equipment industry now has the following characteristics:
1. Have a certain advantage, teaching and research industry system perfect
Domestic papermaking equipment manufacturing industry can provide the industry with a full range of medium and above all the equipment, domestic equipment to undertake 60% to 70% of papermaking capacity, technical performance also belong to the upper level in the world after the United States, Germany , Finland, Japan and a few developed countries, in some technical equipment above also have their own innovative advantages, such as grass raw material preparation and even steaming equipment technology, for the paper industry to provide complete equipment is China’s paper industry into the international The main reason for the papermaking power. In line with this is also our country from the school, research and design to manufacturing, standard testing of a complete system, including from the personnel training, technology development and design to product quality control of the production service system for the long-term equipment manufacturing industry Development provides a very good protection.
2. The supporting industry is complete
For the papermaking equipment industry is also relatively complete industry, specialized division of labor basic rational allocation, the establishment of a dehydration equipment, a variety of roller plastic package, sieve drum, water roller, headbox, vacuum roll, sealed hood, and other professional manufacturing Enterprises, and even reducer, automation systems, vacuum pumps, both for the paper industry, but also for other industries of professional firms to ensure that the entire industry seamless matching, but also for the development of the industry played a protective role.
3. The rapid development of major equipment
(1) pulping equipment aspects
Large pieces of wood and bamboo super-batch cooking main equipment has been basically domestic, such as large-scale intermittent cooking pot (250 cubic meters) and so on.
Grass-based raw materials consisting mainly of 150 to 300 tons / day of horizontal tube continuous cooking system equipment and automatic control system, has all achieved localization.
Domestic corrugated filter plate, small flat valve washer is now more suitable for a variety of non-wood fiber pulp washing and black liquor extraction, the largest vacuum washing machine drum area of up to 120 square meters, can be supporting 200,000 tons / Year KP wood pulp project.
In recent years, the domestic production of new replacement twin-roll extruder series, the maximum roll specifications Φ2200mm × 8400mm capacity can be equipped with 1.5 million tons / year pulp system; into the pulp concentration were 3.5% to 10%, 25% to 35%
The development of large and medium-sized domestic ECF / TCF complete sets of equipment and technology. With China’s independent intellectual property rights in the concentrated pulp clean production bleach complete sets of equipment, including double riser oxygen delignification section, hydrogen peroxide bleaching section and the matching medium-thick slurry pump and medium-thick high shear mixer. (AOX) fully meet the national emission standards, and compared with the traditional CEH three bleaching, water saving more than 50%, energy consumption reduced by more than 30%, are clean bleach technology and equipment, the highest production capacity Up to 500,000 tons / year.
It is also possible to make progress in the localization of equipment such as high-quality machine pulp, steaming warehouse, impregnator and reaction bin for all kinds of domesticized, spiral tearing machine and high-density disc mill. Domestic development of mechanical pulp or chemical mechanical pulp can be used for twin-screw refiner and APMP chemical mechanical pulp equipment, there are 60 to 100 tons / day of complete sets of equipment, 300 tons / day of complete sets of equipment is being improved.
Domestic waste pulping equipment capacity is growing. At present, it can provide 600 tons / day OCC production line equipment and 300 tons / day deinked pulp production line equipment, including the key equipment drum pulper, vertical pulper, high temperature and high concentration plate heat disperser and flotation off Ink tank has been all made.
Domestic large-scale wood pulp supporting alkali recovery system equipment capacity of 40 to 600,000 tons / year, including the evaporation of water for the 600 tons / hour tube falling film evaporation station, the daily processing of 2200 tons / day single drum low-odor alkali recovery Furnace and large-scale disc-type white liquid filter and pre-hanging white mud filter. China in the grass base of alkali recovery technology in the world leading level. At present in the construction of wheat straw pulp alkali recovery system for the largest daily processing of black liquor solid 1200 tons, evaporation using eleven six-effect tube-type falling film evaporation station, evaporation of water 350 tons / hour, using black liquor viscosity And crystal evaporation technology.
(2) Papermaking equipment
The largest domestic cardboard machine has been the width of 7 meters, the speed of 800 meters / min, 300,000 tons / year or more capacity, air or hydraulic headbox, four stacked or five stacks forming, High-line pressure large roll diameter press, single-row cylinder with double-row cylinder with a dry tube, independent lead wire draw paper.
Has been built more to run the largest domestic culture paper machine, machine width 3.8 meters, the working speed of 800 meters / min, the output of about 250 tons / day. Model long net plus top net, hydraulic headbox, four roller three nip / five roller three pressure press, drying part of a single row of cylinder with a paper stabilizer, independent cited rope draw paper. “Eleventh Five-Year” National Science and Technology Support Program, Henan Jianghe Paper and South China University of Technology, light industry, Hangzhou Institute of Electrical and Mechanical Design and other joint research and development of high-speed cultural paper machine, marking China’s paper machine technology has made a breakthrough.
Domestic successful development of 700 m / min vacuum round paper machine and 1000 m / min or more crescent-type tissue machine, production capacity of 8,000 tons / year to 20,000 tons / year. Breaking the hydraulic headbox, steel Yankee dryer, folder network technology.
Mainly for long fiber or mixed fiber ultra-low concentration of the production of special paper oblique paper machine from scratch, the largest domestic width of 3300 mm, speed 200 m / min; the current single and double-layer forming oblique wire machine Has been successfully run into production, three-tier forming machine is being developed.
4. Chinese paper-making equipment, the number of enterprises, small size, cost-effective
The number of manufacturers engaged in papermaking machinery more, there are more than 200, but its size is not large, the largest annual sales of enterprises in the 4 to 500 million yuan, a single enterprise and international companies (such as Voith, Metso / Valmet Andritz), etc., in terms of size, technical and quality there is a huge gap. Mutual technical similarity, features are not prominent, and basically not much development capacity. Compared with the paper industry, the development of papermaking machinery industry is relatively slow, processing methods are more traditional, update is slow, the scale is difficult to go up. But the domestic equipment is still a comparative advantage, especially the cost and after-sales service, and international companies is difficult to form a competition, is basically complementary.
5. Technology development means a single, independent intellectual property rights and the number of effective patents less
Technology development means a single, whether business, or research institutes, universities, have failed to establish an effective equipment development test platform and an effective remote system, so far so far, the means of technological development still remain in the digestion Absorption of the main way, independent intellectual property products rarely, less effective number of patents. This is still a huge gap compared to large international companies, the result is that the performance of imitation of the product is difficult to achieve or exceed the original level, and there is no imitation of the performance of the instability, energy consumption and material consumption, reliable Sex is not high and so on, and these problems are not soon to be resolved.
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