With the rapid development of the economy, in recent years, the high-margin golden period of the carton industry has passed, and the carton industry is facing the dilemma of diminishing profits and increasingly fierce competition. At the same time, some paperboard manufacturers are still pondering over the efficiency of production, the quality of production, and whether it is time to renovate old equipment. Cardboard makers have already realized that a series of problems such as cardboard collapse, softness, blistering, bending, wrinkling, ribs, poor adhesion, untimely delivery, ECT, FCT, etc. have also caused some business owners to suffer badly; Contradictions have been highlighted, and partial modifications have been made to old equipment in the hope that they will receive substantial returns. However, facts can only be due to people.
I have been engaged in the corrugated paperboard industry for more than ten years, witnessed the rapid development of the carton industry, and also experienced the rapid development of corrugated machinery technology, from the simplest operation, the most primitive single-sided machine, manual winding machine, to the management of monthly production value over ten million The tile-laying equipment laments the advancement of advanced technology in promoting productivity and social economy, and at the same time, it also realizes the crucial role that some advanced technologies play in tile-line equipment. At the beginning of the millennium, the author began to provide advice and reforms for some of the country’s technically backward tile line equipment. Over the years, he visited hundreds of carton manufacturers and saw huge differences between the north and the south. He also made suggestions for some business owners. It has been recognized and praised by most of its peers and misunderstood. Until today, the author has invested his accumulated experience over the years in the transformation of full-time tile lines and had in-depth communication and cooperation with hundreds of domestic carton manufacturers. During the period, some of them are state-owned large-scale enterprises: Yanjing Group, Beijing Erguotou Winery, Shandong Dong'e Ejiao Group, Ningbo Dahongying and other enterprises under the carton factory and some large private enterprises. Now I will elaborate on my own opinions on the reconstruction of the tile line, for the reference of my colleagues.
To achieve high-quality, high-productivity, we must have a certain understanding of equipment performance and quality control of raw materials. The skills and quality of operators must not be ignored. According to incomplete statistics, currently there are more than 3,000 tile lines currently in China, but less than one-fifth of the tile lines that can achieve high-yield and low-loss lines, most of which are low-speed cable-laying devices in the 1980s and 1990s. There are defects in the design due to the backwardness of the technology at the time. The core technology of tile line equipment is in the single-sided machine, double-sided machine, drying tunnel section, and cross-cutting machine. The key issues affecting product quality are single-sided machine, double-sided machine, and drying section. Faced with many quality problems, the solution is often to reduce the speed, increase the weight of the original paper, buy inferior additives, and add counterfeit and zero-refit parts. According to the author's many years of experience in the production of large-scale foreign-funded enterprise cardboard, to visit the customer's factory at first glance depends on the preheating wheel and the maintenance of the equipment. As a result, it was found that 80% of the tile preheating wheels were rusted; dust was a few centimeters, and no oil was added throughout the year, and the bearings were dry. In this case can produce a good cardboard? Even if you use imported base papers and increase the weight, you may not be able to make good cardboard. So why manufacturers of tile line also use preheated cylinders with a diameter of 1100mm or more instead of 300mm or 500mm diameter preheated cylinders? Manufacturers are not cost-saving, their purpose is only one: to improve quality, smooth high-speed paper. As long as we improve on the following points, we can see what is different.
1. Improve the quality of cardboard, mainly *: 1 excellent corrugated type; 2 high quality steam supply; 3 starch gelatinization temperature must be controlled within the effective range; 4 fiber quality of the base paper; 5 the quality and technology of the operator.
2. The eccentricity of the corrugating roller should be accurately adjusted normally. Usually, a piece of copy paper (4kg to 5kg of steam is preferred, and the pressure of the corrugation is adjusted to 2.5kg) can be folded in the middle of A4 fax paper. The slow running machine will clamp the eccentricity. The paper is placed on both sides of the corrugated board, and whether or not the stamped corrugation type becomes a three-line pattern, the corrugated waist must be white-to-white symmetrical, and the corrugated thread is as thick as the thread.
3. Between the pressure wheel and the lower corrugated, usually about 20 silk (that is, the thickness of 120g calf).
4. The gap between the paste wheel and the lower corrugated iron is about 15 silk (that is, the thickness of the 80gA4 fax paper).
5. Paste round to achieve about 35 network lines, paste wheel and squeegee round at high speed to do 10 wire ~ 12 wire, low speed to do 16 wire ~ 18 wire around, according to different speeds at any time to adjust.
6. Preheating cylinders are best for maximum contact in spring, summer and autumn.
7. The traditional meaning of the drying section is * roller shaft type to complete the heat transfer, the following to discuss what are the limitations and defects of this approach.
1 any kind of iron material has the characteristics of thermal expansion and contraction, hot plate is also the case, often made of narrow width of the cardboard on the hot plate wear is concentrated in the middle, after a period of wear, the hot plate will appear in the middle Low bending on both sides. In this way, the middle part is not pressed and the two sides are pressed down. Because the upper roller is linear, it will not bend with the deformation of the ironing board.
2 Because the contact of the roller press shaft on the hot plate is only a line, its heat transfer efficiency is also low, and if the pressure is low, it can easily lead to poor adhesion.
3 Roller shaft is installed in the subsection (generally a 60cm hot plate with 6 rollers on top). It is heavy and difficult to adjust. It is easy to damage the corrugated paperboard and the paperboard produced is also prone to bending and unevenness. It is not easy to adjust when three or five layers of cardboard are changed.
4 roller shaft is too heavy, but also particularly easy to cause the hot plate to wear into a V shape, over time, will seriously affect the speed, quality, but also spend human and material resources to wear.
Hot plate is a new technology on foreign high-speed tile line equipment for the above problems, look at the principle.
1. The hot plate is composed of a piece of wear-resistant sprayed tungsten carbide plate. There are two springs on each plate. Under the pressure of the spring, the corrugated cardboard is pressed through the sail belt to make contact with the hot plate. The panel exerts heat to accelerate the energy. Exchange, maximize the use of energy.
2. The spring with uniform spring force can automatically adjust the pressure according to the deformation of the hot plate due to the thermal expansion and contraction of the hot plate, such as degumming and flattening, because the whole group of hot platens will be pressed down, if both sides are high, when the machine is running. It will naturally float high and low, so it can solve the problems caused by the hot plate deformation.
3. The hot plate is composed of a plate with a length of 60cm and a width of 20cm, so the contact surface is several times larger than the contact surface of the roller, and the stable pressure gives the plate the required stable pressure, so it can improve the transmission. Thermal efficiency. Increasing the heated area can increase the speed by 20% to 30%.
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