Low-carbon economy calls for green printing and dyeing equipment

Under the guidance of the global low-carbon economy and the guidance of the national energy-saving and emission-reduction policies, the development of printing and dyeing equipment is developing in the direction of saving water, saving electricity, and reducing pollution. The printing and dyeing equipment exhibited at the 2010 China International Textile Machinery Exhibition and ITMA Asia Exhibition held in June this year all reflect the concept of green environmental protection.

Pre-treatment equipment: Targeting energy conservation

Pre-treatment is the basis for guaranteeing the quality of printing and dyeing products. It is a large water-consuming and energy-consuming consumer of printing and dyeing processing. Its water consumption accounts for more than 60% of the printing and dyeing industry, and the pollution level accounts for more than 70%. Therefore, upgrading the energy-saving and environmental protection level of traditional printing and dyeing pre-processing equipment is a major direction for equipment manufacturers in recent years, and has achieved great results. The singeing, desizing and cold-reactor combined machine developed by Germany's GOLLER Company adopts a typical cold-rolling and stacking process, which has a short flow and significant energy-saving and consumption-reducing effects.

In addition, in the development of pre-processing equipment, new water-saving processes are being implemented to reduce the consumption of water and chemicals from the source. The Soft-Coating double-sided liquid feeding device exhibited by Germany's MONFORTS at the 2010 China International Textile Machinery Exhibition and ITMA Asia Exhibition, according to the process requirements, the fabric can be used for single-side feeding, double-sided feeding, and two slots. Different liquids can be placed for different types of processing on both sides. By adjusting the rotation speed of the feed roller by microwave detection, the required moisture content, the time of the feed and the depth of penetration can be obtained. With this method of liquid feeding, the liquid-carrying rate of the fabric is only 10% to 20%, and some even do not need to be dried. The effect of saving water, saving chemicals, and saving heat energy is very satisfactory.

Domestic printing and dyeing equipment has also made great breakthroughs in energy conservation. Ultrasonic washing machine in Jiangsu Hongqi applied ultrasound to the washing of fabrics, which has aroused great concern in the industry.

Zhangjiagang Jianye Printing and Dyeing Machinery Co., Ltd. developed the MH492 high-efficiency energy-saving rolling mill compared with the ordinary rolling mill, the liquid-carrying rate of the fabric can be reduced by 20%, and the rolling allowance can reach 50% to 55%. The machine is used for the first rolling mill after the mercerizing machine straight roller to the alkali tank, can recover 20% of the alkali liquor. Wuxi Feida Textile Printing and Dyeing Machinery Co., Ltd. introduced FM7518 stenter can save energy by 10%. The Jiangyin Fuda Company's name-environmentally-friendly knitwear post-printing washing and washing machine not only consumes less water and consumes less steam, but also increases washing efficiency by more than 30%.

In order to reduce energy consumption, equipment manufacturers are also making efforts to shorten the process. However, due to the constraints of the process and chemicals, no real short-flow printing and dyeing pretreatment equipment has yet emerged, and the pre-processing of large-volume printing and dyeing cloths is also required. Rely on the production line of traditional process to complete. Therefore, the pre-treatment of large amounts of water and steam has not yet been fundamentally changed. The “Zero Emissions” concept system introduced by Benninger in 2008 was limited by factors such as the cost of use. Currently, it cannot be promoted in actual production. However, industry sources disclosed that the relevant technical conditions for “zero emission” have been met. This will certainly be the ultimate goal of the printing and dyeing industry.

Dyeing equipment: pursuit of low bath ratio

In order to achieve the effect of saving water, the low bath ratio becomes a goal pursued by the dyeing machine technology. The dyeing machine bath ratios of the internationally renowned printing and dyeing equipment manufacturers such as Ericsson and THIES exhibited at the 2010 China International Textile Machinery Exhibition and ITMA Asia Exhibition reached 1:3.

At present, most of the domestic printing and dyeing companies use intermittent dyeing machines, especially overflow dyeing machines. The key to the technical progress of batch dyeing machines is how to reduce energy consumption and emissions, improve process reproducibility, and reduce dependence on people. The domestic dyeing machine manufacturers started from the goal of energy saving and emission reduction, and continuously improved the spout dyeing machine. Various ultra-low bath ratio (1:4.5) dyeing machines were introduced, but the structure of the woven fabric circulating from the dyeing liquid was adopted. From the perspective of actual production, it is still difficult to achieve.

Continuous flat dyeing for woven fabrics has become very mature. However, continuous width dyeing of knitted fabrics has not yet been applied. Domestic manufacturers such as Hongqi, Xinlian, Jianye, etc. in Jiangsu Province have Some of their own core technologies are basically continuous woven fabrics with woven fabrics, and there are no technological changes or innovations in the individual units. At present, the study of flat width continuous dyeing machines mainly focuses on the dyeing of knitted fabrics, but the tension and curling problems have not yet made breakthrough progress, and most of them still remain on the conceptual discussion and publicity. To really solve this problem, we need a process. The MONFORTS wet steaming (continuous wet steaming) continuous dyeing machine has a very good design concept. The special design on the guide roller can not only slightly expand the fabric but also prevent curling. It will not produce excessive tension and fabric surface damage, and it has good guiding significance for flat continuous dyeing of knitted fabrics.

It is worth mentioning that cold pad-batch dyeing is a dyeing method with a high degree of concern in recent years. Its advantages are salt and steam savings, and its short process flow is in line with the current low-carbon economic development needs advocated by the country. However, cold pad batch dyeing is currently limited to reactive dyeing, and the quality of cold pad batch dyeing is affected by many factors, such as the quality of fiber and grey cloth, the quality of the pre-treatment, etc., and many domestic dyeing plants are subject to management and process flow. The reason for this is that it is not yet possible to guarantee the quality of these related processes, so it is easy to cause the quality of the cold pad batch dyeing to be unstable.

It is understood that cold pad-batch dyeing has long been used in many dyeing plants abroad. Facts have proved that cold pad-batch dyeing technology itself has basically matured. The key issue is that printing and dyeing plants must ensure the quality of the previous processes in order to successfully achieve cold pad-batch dyeing. Industry analysts believe that from the current situation of enterprise integration and technology upgrading in the printing and dyeing industry, enterprises should be encouraged to apply cold pad batch dyeing, which is not only conducive to energy conservation and emission reduction of enterprises, but also has a reality for low carbon development in the entire printing and dyeing industry. significance.

Printing machinery: more accurate and efficient

With the rapid growth of China's printing industry in recent years, printing machinery manufacturing industry has maintained a good development trend in recent years. Especially in the last two years, despite the financial crisis, the sales of printing equipment still presented a situation in short supply.

From the products exhibited at the 2010 China International Textile Machinery Exhibition and ITMA Asia Exhibition, it can be seen that the rotary screen printing machine continues to develop in a more precise, efficient, practical and convenient direction. The Netherlands STORK company as the international leader in rotary screen printing technology, the new machine developed by Picasso EVO rotary screen printing machine, electrical configuration, practicality, ease of operation and maintenance and other aspects have reached a new height. Domestic printing machines are approaching the level of first-class European products in terms of the color appearance of process manufacturing and the exquisite degree of component processing. The UNICA model launched by Huangshi Jingwei in cooperation with Mignani Italy has greatly improved the technical level of domestic rotary screen printing machines. As a company with the highest market share in the rotary screen printing machine industry, Panlong Machinery has a good performance in precision, high efficiency and practicality. The DGE3080 rotary screen printing machine produced by Xi'an Degao and the Da Vinci rotary screen printing machine produced by Fujian Juwang have their own innovation points.

With the increase in demand, flat screen printers have achieved significant growth in sales, and have also seen significant improvements in increasing production speeds and meeting heavy fabric printing requirements. The flat screen printing units developed by the Busser company in Switzerland are all driven by servo motors and are more accurate. The large scraper-type flat screen printing machine exhibited by Qizheng Company separates the blade lifting structure from the lifting structure and is independently driven by a servo motor, which makes the scraping action more coordinated, thereby increasing the production speed of the device.

The application of digital printing technology has also been widely implemented in the industry in recent years. At the same time, digital printing technology has been continuously improved. The printing speed has been further accelerated, the cost has been further reduced, and the product market has become more and more highly recognized. Italy's Mignani company announced the highest rate of ink-jet printing has reached 400 square meters / hour, the Italian MS company announced that the machine's printing speed reached 370 square meters / hour. Hangzhou Honghua has also been highly recognized in the domestic market for high-speed inkjet printers. At the 2010 China International Textile Machinery Exhibition and ITMA Asia Exhibition, they demonstrated on-site the printing production process of domestic paint inks and reactive inks. The DSDPM(II)-160 printing machine exhibited by Shaoxing Dongsheng Digital Co., Ltd. has completed the printing process after the digital ink jet printing and printing of the pattern, and after the second half of the fixing device, the steaming and washing are eliminated. In other processes, there is no water intervention during the entire process, and there is no sewage discharge. The water-saving effect is obvious. Experts believe that with the increase in product market acceptance, the industrial application of digital printing has begun.