What is the difference between the performance of domestic dyes and imported dyes? What are the expectations and requirements of printing and dyeing companies for dye products? What are the advantages of imported dyes? What are the characteristics of domestic dyes? What are the standards for printing and dyeing engineers to purchase dyes? We invite a few first-line experts to answer our questions.
Chen Shenyang, chief engineer of Tianjin Sanhuan Textile Printing and Dyeing Co., chose dyes. Only the quality of Tianjin Sanhuan Textile Printing and Dyeing Co., Ltd. used domestic dyes increased from the previous 20% to the current 60%. There are two reasons for the change of data. First, the quality of domestic dyes has improved. For example, reactive dyes, the chromatograms of domestic reactive dyes are relatively complete. Second, the company has adjusted the dye structure used and adjusted according to actual production needs. With dyes, the structure has new changes. However, at present, for orders with high requirements on color, environmental protection and color fastness, imported dyes are still basically processed. Most of the imported products are well-known brands such as Huntsman and BASF. The domestically produced products are mostly products of Tianjin Dyeing Eight Factory and Chuyuan Gorgeous.
Although domestic dyes have greatly improved in terms of strength and particle size, they still need to be improved in terms of vividness and environmental protection.
As the chief engineer, I have my own purchasing standards. First, the dyes selected should meet the needs of the factory's existing production processes. For printing and dyeing enterprises, the production process is mostly mature technology, long-term process, and all the raw materials and other conditions are basically fixed, and can not be changed at will, so as not to affect the production quality. Second, the cost is low. This low cost requirement is also raised in the case of normal production. Finally, the color matching is relatively simple. The color matching of the dye has a great influence on the subsequent processing. If you can achieve a color with two dyes, you can't use three. It is well known that with fewer varieties of dyes, the accuracy will be higher and the adjustment will be simpler. Dyes with relatively simple color matching can also increase production efficiency.
Du Dehua, general manager of Hebei Mingshi Dyeing Co., Ltd., cooperated with the upstream and downstream of the “Northern Printing and Dyeing New Technology and New Product Exchange Conference†held by Hebei Textile Industry Association. Du Dehua, general manager of Hebei Mingshi Dyeing Factory Co., Ltd. introduced the innovative experience of Mingshi Dyeing Factory. At the same time, pointed out the problem of dyeing materials faced by printing and dyeing enterprises.
Environmental issues. As foreign technical requirements are becoming more and more demanding, new technical standards and requirements have been mentioned on the agenda, and the safety inspection certificate for the dye auxiliaries used and the inspection report containing no banned chemicals have been added to the inspection. Half of the dye auxiliaries used in our factory are imported products. The internationally renowned large companies such as Corning, Huntsman, DyStar and BASF can provide corresponding materials and certificates. At present, some domestic dyeing materials suppliers In this regard, the response speed is slow, some equipment is not available at all, and it is difficult to adapt to the needs of the high-end market.
Chromatic aberration problem. As we all know, the printing and dyeing factory faces the problem of chromatic aberration every day, including the chromatic aberration, the chromatic aberration in the side, the chromatic aberration before and after, and the positive and negative chromatic aberration, including the stability of the semi-finished products, as well as the compatibility of the dyes and the feasibility of the dye. Sex, the fineness of the workers' operations, and the quality control system of the company. However, the problem of chromatic aberration caused by the difference in dye characteristics can not be ignored. Some dye factories lack cooperation with printing and dyeing factories, and they face many difficulties in dye compatibility and metamerism. This requires the printing and dyeing factories and dye factories to solve them together.
In terms of fastness. Nowadays, the requirements of customers are getting higher and higher. The light fastness has become the common requirement of customers. The general color requirements are AATCC16E grade 4 or ISO6 grade. At present, the blue light fastness of reactive dyes is not ideal. For example, some products are sun-dried. The fastness is good, but the compatibility with red and yellow is poor. Therefore, the printing and dyeing factory urgently needs the introduction of dyes with various indicators.
At the same time, the middle and dark dry cleaning requirements of 4 or more, wet friction requirements 3 to 4, alkaline and acid perspiration fastness requires 4, chlorine bleach, non-chlorine bleaching fastness 4, water fastness 4, etc. Etc., this makes the printing and dyeing factory need to understand the influence of dyes and various finishing factors on the dyeing results, and increase the difficulty of processing, but there is no room for enterprise development if there is no product with high standards. Therefore, we must jointly develop and develop the market in the upstream and downstream. On the one hand, the printing and dyeing factory needs strict process and fine operation. At the same time, we need to develop a new round of products for each dyeing and chemical production plant to meet the final needs of customers and achieve a win-win situation.
The completion of the internal indicators. At present, the standards of customers are getting more and more perfect, and the internal quality indicators are more and more demanded. It can also be said that whether the printing and dyeing products can meet the standard is a basic condition for receiving orders. In addition to the normal indicators, many new ones are now available. The indicators relate to cotton, spinning, weaving, printing and dyeing processes, dye additives, etc., such as: high-strength indicators, which is precisely a barrier to many high value-added products. High sun exposure involves the materials used. The degree involves dyes, printing and dyeing processing technology, and the auxiliaries used. The solution to these problems is not effective on the one hand, and it is necessary to make a major breakthrough in the joint research of upstream and downstream enterprises in the printing and dyeing industry.
The correct selection of Pan Xuedong, the deputy chief engineer of Anhui Huasheng Carbon Fiber Co., Ltd., was based on the 1990s. The dyes used by Anhui Huasheng Carbon Fiber Co., Ltd. are mainly imported dyes, mainly disperse dyes, reactive dyes and Shilin dyes. At that time, the performance of domestic dyes such as vividness and improvement rate did not meet the production needs. At present, the dyes used by the company are mainly based on Huntsman and DyStar brands, and domestic dyes are mainly based on Shenxin and Bauxite. The additives are mainly made with Clariant products.
At present, domestic dyes still have shortcomings. Some products with special requirements (including sun-resistant, etc.) can not meet the requirements, the rate of increase is not high (resulting in insufficient depth of color), the solubility is not enough, and the individual products can not meet the requirements. For example, the exhaustion rate of domestic reactive dyed cotton fibers is generally only 60% to 70%. In addition to the lack of quality and performance of these products, there is also an aspect that some dye companies have to improve their product after-sales service concept. When foreign brands launch products, they are often launched in a group. At the same time, related technologies and after-sales services can be followed up, while some domestic companies are somewhat backward.
As an engineer, I mainly consider the following factors for the purchase of dyed materials. The first is the performance of the product, which should meet the needs of printing and dyeing processing. The second is economic. Printing and dyeing companies are now under various pressures, and reducing costs is an important consideration. If domestically produced products can meet the production needs, high-priced imported products will not be used. The third is the operability of the product. In short, the range of process conditions for normal use of dyes is relatively wide (such as temperature, p H, etc.), and not limited to very narrow conditions. If the product is very sensitive to the process conditions, it is not conducive to the quality assurance of large production. In Anhui Huasheng Carbon Fiber Co., Ltd., engineers are not able to directly determine the type of dye used. The company has a special team to analyze the economic benefits of dyes. The task of this group is to conduct experiments, tests, and data analysis on several alternative dyes, and finally decide which dye should be used.
Lu Weiming, deputy manager of the production department of Xiamen Hualun Printing & Dyeing Co., Ltd., compared the three dyes. In the 1980s, Xiamen Hualun Printing and Dyeing Co., Ltd. used domestic dyes, and only a few imported dyes were used when requested by customers. With the expansion of production scale, the continuous development of the company, and the continuous improvement of customer requirements, the company has gradually adopted imported dyes, and the proportion of domestic dyes has been relatively reduced. Most of the reactive dyes are imported products. If the vat dyes can be replaced by domestic products, of course, domestic products will be used. Imported dyes are mainly based on DyStar products.
Regarding the purchase of dyes, I believe that the most important thing is to shop around and the price of the products is better. For products with the same performance, of course, the price is low. The other is that the credit of the business is better. The company's dye suppliers are mostly "old relationship" dye manufacturers, which are established through years of exchanges. Faced with fierce competition and tremendous pressure to survive, many companies are reluctant to try new products from new suppliers. The biggest concern is that once a new product has problems and the dyeing effect is poor, productivity will be affected.
In general, domestic dyes have yet to be further improved in terms of production formula, production process, stability, batch-to-batch, and chromatography. I think that Chinese people can produce good dye products, but sometimes some companies are still a little bit worse at work.
Liu Weibin, deputy chief engineer of Shandong Yaguang Textile Group (mainly responsible for printing) Sun Xinjian (mainly responsible for dyeing)
Domestic dyes are in progress. The dyes used in the printing of Dongshan Optical Textile Group are mainly made in China, and more than 80% of the dyed parts are made of domestic dyes. In the past, the company used to import dyes. With the expansion of production and the development of the company, it gradually tended to use domestic dyes. There are two main reasons: First, the quality and level of domestic dyes have been greatly improved, and they are still improving; second, the improvement of the quality of domestic dyes has become the basis and premise of the company's choice, and the price of domestic dyes is relatively low, naturally It has become the main consideration for business selection. Among these dyes, the imported dyes are basically only products of Huntsman, and the domestic dyes are mainly products of Jiangsu Shenxin Dyestuff Chemical Co., Ltd. and other manufacturers.
From the development of domestic dyes in recent years, the performance of many aspects of domestic dyes has improved a lot. For example, some domestic dyes have better color fastness than imported dyes. Of course, there are still some shortcomings in domestic dyes. For example, there is still a need for improvement in terms of vividness and color. At the same time, stability is also an aspect of the effort.
As an engineer, Liu Weibin believes that the procurement of dyes mainly considers three factors. The first is power. The force is high, the amount of dye used is relatively reduced, and the problems of processing wastewater and pollution are relatively easy to solve. Second is the customer's request. The customer is God. If the customer explicitly requires the use of imported dyes or a brand of dyes, the company will produce according to the customer's requirements. Under normal circumstances, the use of domestic dyes can meet customer requirements for fastness, etc., using domestic dyes. The other is the stability of the dye. This is a very important aspect. The stability of the dye has a direct impact on the reproducibility of the dye and the quality of the dye.
Sun Xinjian believes that two aspects are mainly considered when purchasing dyes. One is the reproducibility and compatibility of dyes. The reproducibility and compatibility of the dyes will be higher and the production efficiency will be relatively high, which is close to a successful dyeing (RFT). The second is the color fastness after dyeing. This is also an important part of the quality of dyed products.
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