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What are the new technologies in the field of dyeing and finishing?

Date:Nov 23, 2020

1. Knitted open-width dyeing and finishing technology

Because knitted fabrics have the advantages of being very fashionable (which can quickly respond to market requirements); high elasticity (can be controlled by the fabric structure); easy to care; fluffy and soft to the touch; it can rely on changing the fabric structure to make the clothing cool or warm. In recent years, with the rapid economic development and the diversification of people’s lives, the demand for knitted fabrics is growing rapidly. At present, the fiber consumption of knitted fabrics and woven fabrics is almost the same. Knitting dyeing and finishing has also become capable of dyeing with woven fabrics. The entire PK industry. Due to the special structure of knitted fabrics, it has a higher yield (3 times higher than that of woven fabrics); the production cost of knitted fabrics is about 50% lower than that of woven fabrics; lower investment (the so-called "family workshop"); Various fibers; no need for sizing; therefore, most of the dyeing and finishing of knitted fabrics are currently processed by overflow machine rope intermittent processing, which consumes high energy, water, time and labor, high cost, and low quality. High-tech (elastic fabric), high value-added knitted products are difficult to process. Forcing knitted fabrics to develop into continuous spinning of open-width dyeing and finishing, and gained good experience.


Recommended technology

Because the knitting structure of knitted fabric is different from that of woven fabric, it has poor forming and large internal stress, which is easy to curl and stretch deformation. Therefore, in the flat-width dyeing and finishing of knitted fabrics, low tension must be maintained and the action time must be as long as possible. It may be short. This puts forward higher requirements for processing equipment. From the overall technical level of the current knitted fabric pretreatment equipment, the key to the open-width dyeing and finishing technology of knitted fabrics is to control the radial tension of the fabric and prevent curling and wrinkling. Today, when the equipment control technology is very mature, it has basically been solved.


2. Inkjet printing technology

In 2015, the global inkjet printing fabric reached 1.2 billion square meters, of which 430 million square meters in Europe and 240 million square meters in my country. The print heads are arranged horizontally, and the Single-Pass digital inkjet printing machine, where the fabric is transported under the print head during printing, and the rotary screen + digital high-speed digital inkjet printing machine, realize the rapid production of inkjet printing, and its printing speed is almost Comparable with traditional printing speed.

As the core component of textile inkjet printing machine, the development of stable, reliable and high-resolution piezoelectric nozzles is the main trend of nozzle development. At present, the highest printing accuracy of some nozzles has reached 1600dpi.

As the main colorants of digital inkjet printing, such as reactive, dispersive and acid inks have matured, and some varieties have achieved localization, the key technologies in paint ink digital inkjet printing have not been completely resolved. High-energy ray treatment, plasma treatment, sizing or cationic modification can significantly reduce the permeability of ink, and improve the fineness and vividness of digital inkjet printing patterns. ’

  ▲Recommended technology

Nano-coated pigment ink is a kind of ink prepared from pigment surface coating polymer as colorant. On the one hand, the pigment surface coating polymer can prevent the pigment particles from approaching each other and form a film on the surface of the pigment during color fixation. On the one hand, it can reduce the content of latex particles in the ink, thereby avoiding the problems of nozzle blockage and interruption of the inkjet process caused by the demulsification of latex particles. Nano-emulsion ink is a colorant composed of dyes and latex particles. This colorant is versatile and is expected to solve the defect of poor inkjet printing fastness of paint ink. It is useful for eliminating the finishing of printed fabrics and achieving clean production of inkjet printing. important meaning.

  ▲Development trend

Textile digital inkjet printing only accounts for 1% of the entire textile printing market in my country, far below the 20% sent to the country. Inkjet printing has huge development potential in my country. It is expected that the improvement and perfection of Single-Pass digital inkjet printers and rotary screen + digital high-speed digital inkjet printers will still be the research hotspots of fast digital inkjet printers in the future; to meet market individualization, small batches and rapid response The low-speed, high-precision digital inkjet printing machine, and its supporting pre-processing and finishing equipment will also be improved with the changes in people's consumption concepts.

 

Realizing the intelligent control of ink droplets will be an important direction for the development of the next generation of digital inkjet printing machine nozzles; paint ink inkjet printing is still the most promising inkjet printing for future textile inkjet printing due to its versatility to fabrics and simple pre- and post-processing features. Ink ink, with the continuous breakthrough of the key technology of paint ink inkjet printing, paint ink inkjet printing will surpass reactive inks and become the mainstream product of inkjet printing in the future.


3. Development and production of environmentally friendly printing and dyeing auxiliaries

With the popularization of the concept of green ecology, chemical control, digital online control of the whole process of printing and dyeing, rapid integration of information management and process technology, the popularization of refined and intelligent management, ultrafiltration, nanofiltration and reverse osmosis membrane wastewater treatment technologies Popularization and application of cotton fabrics, low-temperature bleaching of cotton fabrics, high-efficiency de-bo With the popularization of bath dyeing and other technologies, the rapid development of inkjet printing and the comprehensive utilization of resources, China has a good foundation for the development and production of environmentally friendly printing and dyeing auxiliaries.

In the future, the development and production of environmentally friendly printing and dyeing auxiliaries in my country will develop in the four directions of safety and non-toxicity, clean and green, energy saving and emission reduction, and multi-function.


Safe and non-toxic: Improve the overall technical level of environmental pollution detection, toxicity evaluation and performance evaluation of printing and dyeing auxiliaries, and improve the characteristic data of physicochemical, toxicological and ecotoxicological properties of auxiliary agents. Attach importance to the implementation of international standards for ecological textiles in our country, and ensure that there are no banned and restricted substances in printing and dyeing auxiliaries.

Clean and green: Improve the limited control technology and detection methods of toxic and hazardous substances in the production of printing and dyeing auxiliaries, pay attention to the production environment and process of printing and dyeing auxiliaries, and pay attention to ecological textile mark certification, and strive to achieve zero discharge of hazardous chemicals.

Energy saving and emission reduction: Attach importance to the development of high-efficiency, energy-saving, short-process, low-temperature, and degradable printing and dyeing auxiliaries, and attach importance to the rational utilization and recycling of resources such as energy and waste fibers.

Multifunctional: attach importance to multifunctional fluorine finishing agent, compound enzyme preparation, textile anti-mold, flame retardant and mothproof finishing agent, multifunctional pre-treatment agent and finishing agent, pigment printing crosslinking agent, deepening agent, thickening agent, anti-ultraviolet rays Development and production of environmentally friendly printing and dyeing auxiliaries such as antibacterial finishing agents and new-generation softeners.