In the past two years, new dyeing and finishing technologies, new technologies, and new equipment have continuously emerged at home and abroad, showing the momentum of the booming development of the global printing and dyeing machinery industry. Energy saving, environmental protection, and high efficiency are the directions for sustainable development of the dyeing and finishing industry in the 21st century. Short processes, new technologies such as automation technology, plate-free printing technology, low-temperature plasma processing, and waterless processing technology are the development trends of future dyeing and finishing machinery. Since CITME'2002, China's textile industry has achieved great development, the speed of industrial upgrading has been greatly accelerated, and the purchase of textile machinery equipment has also increased rapidly. Imported printing and dyeing and finishing machinery in 2002 amounted to US $ 618 million, accounting for 19.4% of the total amount of imported equipment, ranking second; in 2003, China imported printing and dyeing and finishing machinery was US $ 978 million, accounting for 21.10% of the total amount of imported equipment, ranking the first.
At present, the general trend of the technology development of dyeing and finishing equipment is: development to environmental protection, energy saving, time saving, high efficiency, short process, attaching importance to new technologies such as waterless processing technology, plateless printing technology, and low temperature plasma processing; another important trend It is widely used in automation technology, and the transmission system adopts AC frequency conversion multi-unit synchronous speed regulation system. In the control system, programmable controller (PLC) or industrial computer control (IPC) is widely used. Online monitoring of parameters is widely used, which improves dyeing and finishing. The degree of automation of the equipment greatly improves the process stability and reproducibility.
With the development of the dyeing and finishing industry, modern information control technology with electronic computers as the main body has penetrated into all fields of dyeing and finishing machinery. Dyeing and finishing equipment integration of electromechanical and instrumentation, automation, man-machine dialogue, process setting, automatic detection and control, remote diagnosis and other means are widely used. In terms of ecological dyeing, finishing and environmental protection technology, the international textile industry has developed rapidly. Manufacturers at home and abroad have paid more attention to environmental protection and energy saving. Dyeing equipment in the design scheme pays attention to the effectiveness of the equipment, which is beneficial to ecological and environmental protection. And energy consumption in order to achieve the purpose of high efficiency, high speed and short process.
Dyeing and finishing production shows the development trend of short process and high efficiency. The corresponding short process and high efficiency process equipment are mainly cold rolling stack pretreatment, wet short steaming pretreatment, coiling mercerizing, cold rolling stack dyeing, wet Short steam dyeing, rolling dyeing and high liquid feeding device.
The trend of personalized, comfortable, functional, and fashionable textiles has promoted the development of dyeing and finishing equipment to adapt to the trend of small batches, multiple varieties, and one machine and multiple uses.
The current world dyeing and finishing trend is to develop new technologies and new equipment based on ecological concepts, and to start research and development in combination with processes, dyestuffs, additives and other channels. For example, the use of anhydrous processing technology, plate-free printing technology, low-temperature plasma processing technology, nanotechnology, biological enzyme technology, etc., make the printing and dyeing finishing process flow shorter, higher production efficiency, and better product performance. New technologies and new equipment mainly have the following aspects:
New technology for continuous processing of knitted fabrics. The continuous flat dyeing and finishing of knitted fabrics not only improves the quality, has less damage to the fabric, has good flexibility and reproducibility, and can reduce the production cost of the mercerizing machine by about 10% to 15%. Extra-wide cloth clamp straight roller mercerizing machine suitable for woven fabrics with nominal widths of 3200mm and 3400mm. A five-roller or two-roller threaded micro-tentering device is added between the straight-roll alkali soaking zone and the mercerizing stabilization zone, which can effectively prevent the weft shrinkage of the fabric after it is impregnated with concentrated alkali. Digital jet printing. Digital jet printing with revolution in printing technology, printing speed has reached (360dpi) 25 square meters / hour or more.
Alkali concentration monitoring online. The "alkaline concentration computer online monitoring system" developed by Xi'an Degaomai Printing and Dyeing Co., Ltd. has a good human-machine interface. The whole machine is controlled by a large-size color LCD touch screen, which is intuitive to display, easy to operate, and clear at a glance. Through PID adjustment, it is not excessive The best control with high precision and high stability.
In recent years, the degree of electromechanical integration of dyeing and finishing and equipment in China has improved to a certain extent, and the application range of electronic technology has been continuously expanded. In the product design, modularity and building blocks are emphasized; electrical drag is stable and reliable, and the tension is adjustable, so that the human-machine-environment can be fully coordinated. However, compared with foreign advanced level, there is still a considerable gap between China's dyeing and finishing equipment. Such as poor automation control and program control, online monitoring has not really solved; remote monitoring and fault diagnosis technology is not yet available in China; quantitative titration, automatic feeding is not matched. The main gaps are as follows: On-line detection of process parameters of dyeing and finishing equipment: In the process of pre-treatment, mercerization, dyeing, steaming, and setting of dyeing and finishing, the online detection of certain process parameters has been the key technology for printing and finishing The main requirement of the problem is the detection, conversion, and timely control processing of parameter signals during the rapid change of parameters during dyeing and finishing, and to work stably and reliably. The key problem is to develop a sensor device that can detect parameters such as color difference, alkali concentration, and hydrogen peroxide concentration. After obtaining these parameters in time, adjusting and controlling the production process can greatly improve the quality of dyeing and finishing, reduce consumption, increase production rate, achieve high repeatability, and maintain process stability.
Development of new equipment: At present, it still lags behind the world's textile machinery power in the innovation of dyeing and finishing technology. Manufacturers of dyeing and finishing equipment need to provide corresponding dyeing and finishing processing equipment according to product requirements. They need to provide new fibers such as Lycar, Tencel, Lyocell, Modal, etc. Special requirements, develop appropriate processing equipment.
Printing and dyeing machinery manufacturers can only welcome future development with new technologies. At present, compared with foreign printing and dyeing equipment, domestic printing and dyeing equipment has little difference in appearance and basic use functions. The main gap is still reflected in stability and reliability. Although digital online detection and control technology, computer network technology and other high-tech technologies have been continuously introduced into the manufacture of printing and dyeing equipment, the automation of domestic printing and dyeing equipment has continued to increase, energy consumption and water consumption have gradually decreased, and the three major problems of color difference, weft skew and shrinkage have been gradually improved. Improved, but the problems of poor stability and leaks still exist. This requires that printing and dyeing equipment companies must both attach importance to their ideology and take practical measures from action. In addition, it is a question of the rate of one drive. Foreign companies attach great importance to the first-time driving rate, and the first-time driving rate of their equipment is very high. Relatively speaking, domestic equipment needs to be further improved in this regard.