Brief introduction of corrugated packaging technology at home and abroad
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As an important part of the packaging industry, corrugated cardboard packaging has achieved considerable development in China. Looking at the history of the development of corrugated board production machinery in China, we have experienced the development stage from scratch, from the introduction of imitation to the development of our own. There are more than two decades of history so far. However, compared with foreign corrugated cardboard packaging industry, there is still a large gap. In some of the more developed countries abroad, the development of packaging machinery to the end of the 20th century, the application of a number of advanced technologies and development concepts, so that the development of packaging machinery has basically reached a level of synchronization with the times, so that the application of corrugated board packaging technology More and more extensive, gradually deepening into all areas of the national economy. This article describes the technical status of corrugated board packaging machinery in China and abroad, and specifies the gap between China's packaging machinery technology and foreign packaging machinery technology, hoping to achieve the purpose of promoting the production technology of packaging machinery in China.
First, the history of the development of corrugated packaging machinery in China Paper product packaging generally includes two categories of cartons and cartons. Paper product packaging A pulp is a raw material, which can be recycled or naturally degraded without causing any harm to the environment. It is also called green packaging. After people gradually realize the "white pollution" caused by plastic products, they are more interested in the development and use of paper product packaging. Examining the path taken by China's paper product packaging industry, we can see that before the 1970s, although the number of manufacturers of corrugated cartons was very impressive, the business growth rate was very rapid. However, because the basic industry is relatively weak, most of the factories that are built are low-tech products with poor product quality, low production efficiency, high labor intensity, and excessive resource consumption. This is a semi-manually-operated corrugated paper product packaging manufacturing enterprise. After the reform and opening up, some corrugated paper box manufacturers in China have introduced some foreign-made corrugated paperboard production lines, which has caused tremendous changes in the carton packaging industry, and the production efficiency and product quality have been greatly improved. At the same time, the rapid popularity of cartons as the main outer packaging has also been accelerated. The rise of the carton packaging market has promoted the development of carton packaging machinery. In the early 1980s, Capital Aerospace Machinery Corporation began to set foot in the domestic packaging machinery market, and on the basis of drawing on foreign packaging machinery technology, combined with the actual conditions of China’s development, it developed and developed the first fully automatic corrugated cardboard production line in China. It has opened up a history of self-developing and producing automatic corrugated cardboard production lines in China.
Since the 1990s, China's carton packaging market has been fully developed. With the rapid development of China's home appliance industry and daily necessities light industry, the demand for carton packaging is increasing day by day, which provides a good opportunity for the development of China's packaging machinery market. At present, there are many domestic manufacturers that produce automatic corrugated cardboard packaging machinery, among which the typical ones are: Capital Aerospace Machinery Company Packaging Machinery Factory, Lake Beijing Mountain Light Machine Co., Ltd., Guangdong Zhaoqing Jialong Packaging Machinery Factory, Chengdu Aircraft Industry Company, Yantai Foreign Trade Packing Equipment Factory, etc. These manufacturers produce various corrugated cardboard packaging equipments based on the characteristics of domestic packaging based on foreign technology. These technologies basically meet the development needs of the domestic paper product packaging industry.
Second, China's current technological status of packaging machinery China's production history of corrugated packaging machinery, experienced four stages of learning, digestion, improvement, and innovation. By drawing on the advanced experience of foreign packaging machinery, it has been able to produce various series of corrugated box production equipment to meet the needs of users at home and abroad. Here are some typical technical conditions to explain.
Corrugated board production line of the overall technical indicators, China's corrugated board packaging machinery manufacturers can produce a maximum width of 2.5 meters, the maximum speed of 200 meters / minute of the series of corrugated board production line. The control system of the high-end production line has a preliminary computer central centralized control system, which is connected with the computer terminal of the office to form a production line management system, and has some functions of automatic control.
Single-sided machine: As the key single machine of the corrugated board production line, the performance of the machine directly affects the normal operation of the production line. At present, single-sided machines that can be produced domestically have lead claw-type and leadless-type claws on the structure, and leadless claw-type ones are classified into vacuum-adsorption type and positive pressure type. The above several structures evolved into a series of machine organizations that can meet the requirements of different grades and different users in the country. In recent years, the emergence of single-sided machines with rapid replacement of corrugating roll technology has made corrugated board production more flexible.
Cross-cutting machine: domestic cross-cutting machine currently only two types of computer cross-cutting machine and mechanical cross-cutting machine with instantaneous speed regulation. Compared with the mechanical cross cutting machine, the computer cross cutting machine has unparalleled advantages. Firstly, it is relatively simple in operation and maintenance, and the replacement specification is rapid, which does not cause a large waste and high paper cutting accuracy. Due to mechanical limitations, mechanical cross cutters cannot exceed the allowable range of the machine. Computer cross cutters do not have the maximum cut length limit and can be adjusted at any time as needed. The computer control system of the computer cross cutting machine currently uses a DC servo drive system and an AC servo drive system. The internal management function of the computer can record the user's daily production records, help users to carry out production analysis, reduce production costs, and improve the company's economic benefits.
Slitting machine: The traditional slitting machine uses a rolling shear cutting method to cut the cardboard. Firstly, the incised paper fiber is destroyed, showing uneven burrs and even irregular intermittent oblique slits. Followed by the cardboard under the pressure of the upper blade, the incision is flattened. At present, thin blade slitters developed in China have formed high-, medium-, and low-series slitters. There are computer-controlled computer-controlled slitters on the knife adjustment method and semi-automatic slitters with manual knife adjustment. It is equipped with an automatic sharpening mechanism and adopts both timing and fixed-length grinding methods. The sharpening time can be set according to the paper and cutting conditions.
AC frequency conversion technology has been widely used in the production line control system. In the previous corrugated board production line, electromagnetic speed-regulating motor was adopted for speed regulation. Due to the appearance of AC frequency conversion technology, it gradually became an alternative to electromagnetic speed control motor because of its advantages of low energy consumption, low noise, large speed range, and stable speed. Products.
Carton Printing Slotting Machine: As a follow-up equipment for carton forming, the technology of printing slotting machines in China has also been widely developed. At present, domestic production of high-precision, high-, medium-, and low-grade products with high precision can be produced in China. Various types of equipment.
In order to improve the technical level of China's carton packaging machinery, domestic packaging machinery manufacturers have done a lot of work here to learn from foreign advanced experience and develop carton packaging equipment suitable for domestic needs. However, because China's basic industries are relatively weak, there is still a certain gap compared with developed countries in the world.
Third, the application of new foreign technology in the production of packaging machinery Here is a typical stand-alone machine to illustrate the application of foreign production in corrugated packaging machinery. Beltless single-sided machine without pressure roller: Japan's Mitsubishi's 60G single-sided machine can be the single-machine model, its speed can reach 400m/mim, has the following characteristics.
1, no pressure roller, replaced by a belt made of fiber, to extend the time of sticking and molding, while reducing pressure roller pressure contact point is very concentrated load force.
2. With centralized control, the pressure control of the corrugating roller can be automatically set according to the quality index of the core paper and the paper, and the gap between the squeegee roller and the gluing roller, the corrugating roller and the gluing roller can be automatically adjusted.
3, with rapid replacement of corrugating roller technology, according to the different needs of users to replace different corrugated rollers. 2 Corrugating roller tooth profile design and roller processing technology: The corrugating roller tooth profile has a direct relationship with the corrugated board's quality performance, paper consumption, and noise generated during operation. Therefore, the corrugating roll tooth profile design and production is one of the important issues that corrugator equipment experts always pay attention to. Peters' corrugated tooth profile has good high-speed performance, and on the premise of ensuring the quality of corrugated board, it saves the amount of paper used and improves the production efficiency. In the processing of corrugated rollers, quench hardening technology, surface hard chrome plating and surface coating technology are widely used in foreign countries, so that the service life of corrugating rollers can reach 30 million meters.
Improvement of the performance of the double-sided dryer: The heating part of the conventional double-sided machine is composed of a fixed heating plate device and a gravity roller pressure device. Thermal conduction is difficult to control (especially when the speed of operation changes), resulting in excessive heating of the paperboard and uneven distribution of gravity, which damages the watts. In order to meet the needs of the high-speed corrugated cardboard production line, a ballast method without gravity rollers is used to control the cardboard pressure when the cardboard passes through the double-sided machine. Second, adjust the angle of the heating plate to reduce the heated area.
Application of Water Cutting Technology in Slitting Machine and Cross Cutting Machine: Water cutting technology has been widely used abroad. In the application of corrugated cardboard packaging machinery, FLOW Corporation in the United States has applied water cutting technology to slitting machines to improve traditions. The slitter breaks the edge of the cardboard. Japan's Mitsubishi Corporation is used in crosscutting machines. The mechanism is that the high-pressure water is sprayed at a very high speed through the nozzle, and the powerful water is broken through along the cutting line of the corrugated cardboard.
According to the current development direction of foreign packaging machinery, wide, high-speed, high degree of automation has become the main features. Due to the different focus of the development of each packaging machinery manufacturer, it is not possible to explain one by one here. It is hoped that the manufacturers of domestic corrugated packaging machines can recognize the current gap with foreign countries and jointly improve the production level of packaging machinery in China.