Industry News_Industry News_Shaoxing Belle Heng Printing and Dyeing Co., Ltd.

The flash dyeing technology reduces the water used for dyeing fabric from 50 tons to 2 tons, eliminating the four processes of washing, dewatering, arranging, and drying!

In traditional textile printing and dyeing technology, about 50 tons of water are used to dye and wash one ton of polyester cloth.

Finishing and shaping knowledge after printing and dyeing

In actual production, it is impossible for the dyeing size to have no difference at all, and effective methods should be taken to correct it. The common solutions are briefly described as follows:

How to make the high-pressure sizing process work better?

At present, a large number of shuttleless looms with the characteristics of "large opening, small opening, strong beating-up, and high frequency of opening" have been introduced into my country, which makes the looms increasingly demanding for the pre-weaving process, requiring warp and weft yarns to have high strength. ,

Three minutes to understand the pre-processing, dyeing and finishing process of printing and dyeing!

1. The original fabric preparation The preparation of the original fabric includes original fabric inspection, turning over (batch, box, printing) and sewing head. The purpose of the original fabric inspection is to check the quality of the grey fabric and solve the problems in time. The inspection content includes two physical indicators and appearance defects. The purpose of singeing singeing is to burn off the fluff on the cloth surface to make the cloth surface smooth and beautiful, and to prevent uneven dyeing and printing defects due to the existence of fluff during dyeing and printing. In order to smooth fabric weaving, desizing mills often sizing warp yarns to improve strength and abrasion resistance. The slurry on the grey fabric not only affects the water absorption performance of the fabric, but also affects the quality of dyeing and finishing products, and will increase the consumption of dyeing chemicals. Therefore, the slurry should be removed before scouring. This process is called desizing. 2. Dyeing Dyeing is a relatively complex process, and the process of dyeing fabrics of different qualities is different, such as cotton, polyester-cotton, nylon, polyester, chemical fiber products, blended products, and so on. Some use pad dyeing and jig dyeing, some require high temperature and high pressure dyeing, some only dye once, and some require multiple dyeing. Although dyeing can be done through a padding car, it is also the most difficult process, because in addition to the known color control of dyeing, there are many unknown things in it, such as the stability of the dye at different temperatures, and the steam The control, the pressure control of the rolling mill, etc., are all very delicate tasks. The dyeing long car is divided into two parts, the front car is dyed, and the rear car is fixed. The dyeing method is different according to the different types of dyes selected. The dyes are generally reactive, dispersed, vulcanized, and paint. They have their own advantages and disadvantages, in general It depends on the required colors, and they cannot be replaced with each other. Three, finishing Finishing is a textile technology project that gives clothing fabrics wearability and beauty. The following are the common types of textile finishing: The main equipment is: singeing machine, desizing machine, mercerizing machine, liquid ammonia machine, setting machine, pre-shrinking machine, calender, washing machine, sanding machine, grasping Wool machine, coating machine, etc. Dyeing fastness is the most important indicator of dyed fabrics. The ability of printed and dyed textiles to withstand the effects of the outside world to maintain the original color, also known as color fastness. After dyeing and printing, textiles sometimes go through other processes, such as felting of woolen fabrics, heat setting of synthetic fiber textiles, etc.; in the process of taking, they must be exposed to the atmosphere, sweat, and subjected to washing, friction, and ironing. effect. These can cause different degrees of fading and discoloration of printed and dyed textiles. The main processes that affect the color fastness of printed and dyed textiles are milling, carbonization, chlorine bleaching, and sublimation. The color fastness of dyes or pigments on textiles is related to their chemical structure, concentration and state on the fiber, and the properties of the fiber. The test methods of various color fastnesses are formulated by simulating various wearing or process conditions.

When the proofing is different from the dyeing bulk, how does the workshop deal with it?

In actual production, it is impossible for the dyeing size to have no difference at all, and effective methods should be taken to correct it. The common solutions are briefly described as follows. Cleaning method

Dye-resistant printing on polyester fabric

To obtain patterns on the ground color of polyester fabrics, dye-resistant printing art is usually adopted instead of discharge art. Because polyester fabrics are usually dyed with disperse dyes, when the dyeing process is completed, after the ground dyes diffuse into the polyester, it is difficult to completely destroy them by the discharge printing method.

There are these secrets between printing and dyeing!

The printing process is a process in which dyes or pigments are used to imprint patterns on textiles. Printing is divided into textile printing, wool top printing and yarn printing, and mainly textile printing. Top printing is used to make mixed-color tweed; yarn printing is used to weave special-style colorful pattern fabrics. Fabric printing has a long history.

From ancient times to the present, the traditional Chinese printing and dyeing process

The pattern on the fabric can be formed by dyeing and then weaving, that is, the fiber is colored first, and then weaving. However, in the Yin and Zhou era, when weaving technology was not yet developed, they did not have the technology to weave fabrics with complex patterns. At that time, only hand-painted methods were used to apply pigments on the fabrics. Later, people invented the stencil printing and dyeing technology. Because the printing technology is simple and practical, the printing cost is low, and the printing speed is fast, it is very popular once it appears. Even in the Qin and Han Dynasties, when weaving technology had made breakthroughs and had the skills to weave various complex patterns, printing technology did not stagnate, but was still developing rapidly, and even became an indispensable part of textile technology. The main popular printing methods in ancient times include painting, letterpress printing, clip (xie association), twist, wax and so on.

Precautions for the use of dyeing auxiliaries

Reasonable selection of printing and dyeing auxiliaries to help improve the quality of printed and dyeing products, then how to choose printing and dyeing auxiliaries and precautions for use in reproduction must be understood. The following are the precautions for the use of printing and dyeing auxiliaries: 1. The technician must master the basic knowledge of additives: This is the prerequisite for choosing a good printing and dyeing auxiliaries. To use auxiliaries well, you must have a basic understanding of the basic concepts, basic structure, performance, and use characteristics of printing and dyeing auxiliaries. If abnormal conditions are found, the cause can also be analyzed and dealt with in time. For this reason, I wrote an overview section before each chapter in my handbook, describing the principle of action, basic characteristics, structure classification, use methods, application detection methods and points of attention when using this type of additives, so that readers can basically master this type of additives. The knowledge of additives lays a good foundation for correct use. The basic structure, properties (factory standard), usage, and usage methods of each additive will be introduced in the following introduction. If the structure type is the same, its usage and performance It's also roughly the same, and you can draw inferences about it. If the species is not collected in the manual, as long as you know the basic structure, you can also know it well. Therefore, when Hongqi Factory uses new printing and dyeing auxiliaries, the supplier must inform the structural category of the auxiliaries. For example, the softeners used are amino silicone oil softeners, hydroxy silicone oil softeners, and fatty amide softeners. Which of the imidazoline softeners and fatty acid paraffin softeners should be known by the application plant. Only in this way can we master its basic performance and prevent blind use. 2. Basic understanding of the solubility of additives and their stability to hard water and metal ions. For example, the solubility of anionic surfactants in alkaline is greater than that in acid, while cationic surfactants are on the contrary, amphoteric surface active The agent has both anionic and cationic characteristics, while non-ionic surfactants have little effect. The solubility of the first three surfactants increases when the temperature rises, while the solubility of non-ionic surfactants decreases with the rise of temperature, so If there is a cloud point, the cloud point must be higher than the operating temperature, otherwise it will lose its efficiency and fail to play the role of additives. The cloud point increases with the increase of EO number, and increases with the amount of anionic additives incorporated, but decreases with the increase of electrolyte content. If the leveling agent is used for high temperature and high pressure dyeing as a leveling agent or dispersant, Because the use temperature greatly exceeds its cloud point (usually about 75~C), it will cause precipitation in the dyeing solution, not only does not work, but on the contrary, it will condense the dye and cause the color point. Silicone defoamers are emulsions emulsified by methyl silicone oil or ethyl silicone oil with non-ionic surfactants and white carbon black. If emulsifiers with a low cloud point are used, the same problems mentioned above will occur. This problem is often not paid attention to, which causes great harm to printing and dyeing factories.