In the packaging and printing industry, screen printing technology is not only a printing technology, but also a widely used industrial technology. In order to improve the product quality of small screen printing enterprises, we must understand the characteristics of screen printing and recognize the essence of screen printing. Quality Control And Management Of Small Screen Printing enterprises
In addition to larger enterprises in the fields of packaging, circuit board, printing and so on, small Decentralization can be said to be one of the characteristics of the industry. If operators pursue large-scale in the application industry, from the market-oriented point of view, they must diversify their products in order to obtain a larger market share to suppress higher and higher operating costs. Product diversification for small screen printing enterprises with less manpower and less professional experience will sharply increase the difficulties in quality control, and even make the quality management out of control.Quality Control And Management Of Small Screen Printing enterprises
Managers of small screen printing enterprises will have such troubles. Quality control has become the most troublesome problem in the production process. Some products are always reworked, and these reworked parts even account for a certain percentage. Business managers are often tired and their business objectives become blurred in front of them. The author believes that most of these enterprises are enterprises that produce diversified products, and do what business they come to. The business can be operated, but it is not refined and thorough. If the quality index required by the customer is 100, it can only achieve 95. Quality Control And Management Of Small Screen Printing enterprises
A mere 5 points is the difference between amateur and professional. If small screen printing enterprises want to prosper, they must take the road of specialization. Please note that the specialization mentioned here is not product specialization, but the production of homologous products with little change in parameters in the production process. Many enterprises that have developed to a certain scale have followed this principle, such as Beijing Michelle company, which only does UV local glazing of screen printing and wins millions of profits every year. The development strategy of an enterprise should be to make a specialty fine and thorough, and then figure out the diversification of products.Quality Control And Management Of Small Screen Printing enterprises
For diversified products, we should also consider whether the previous production experience can be copied. If it involves knowledge and technology in another field, we need to be careful. The above description is the business strategy of screen printing enterprises, which seems to have little to do with quality management. In fact, it is not. The quality management strategy is subject to the business strategy. If each production is an attempt to make new products.Quality Control And Management Of Small Screen Printing enterprises
It is only suitable in the laboratory of the R & D Department, not in the highly competitive market. Of course, there are also such screen printing enterprises, plane, curved surface, large and small, and have achieved certain development. However, due to the difficulties of quality management, customer complaints and complaints have become commonplace. Development is always bumpy, like a drunkard. The quality of life is not high, which is not in line with the modern concept of making money and being happy.
For screen printing enterprises, taking the road of professional development is the key to solve the problem of product variety stability. Each product has its own screen printing process, and quality management is the control process of the process. The means of quality management is inspection, and inspection must have quality standards. Here is a problem of standard reference. With the development of screen printing technology and the maturity of the market, customers have higher and higher requirements for product quality. Quality Control And Management Of Small Screen Printing enterprises
The product quality standard is not a static thing. It rises with the requirements of customers. The quality standard refers to competitors or leading enterprises in the industry, which should also be determined by the strategy of the enterprise. Of course, the higher the quality of screen printing products, the better. The higher the quality, the higher the cost. It means a higher scrap rate and defective rate.
The quality control of screen printing enterprises should be a process, not a subsequent inspection after the completion of the production process, because it can not achieve the purpose of control. For large and small screen printing enterprises, the quality inspection process must be integrated into the production process. The specific operation method is: try to standardize the production process, implement digitization, find the reasons affecting the screen printing quality, and establish “quality gates” in the process.
Such as film quality inspection, plate making process control, ink parameter control, etc. Quality inspectors need to be proficient in screen printing to be qualified. In small enterprises, production supervisors must have the quality awareness of “picking the bone in the egg” and exercise the power to issue tickets when necessary.Quality Control And Management Of Small Screen Printing enterprises
Each screen printing product has its own production process and its own quality control technology. Most of these are operation technologies accumulated in practice. In fact, they are specialized things. For example, when printing film switches, low viscosity adhesive rollers are used to remove small dust particles on the surface of printed products. Quality Control And Management Of Small Screen Printing enterprises
Compared with foreign photosensitive adhesives, the raw materials of domestic photosensitive adhesives are exactly the same, and the gap may lie in the relevant additives. The professional and technical experience accumulated by enterprises is one of the cornerstones of building the core competitiveness of enterprises.
Compared with other printing processes, screen printing process is difficult to control many parameters.
In the screen printing industry, those who make very fine and exquisite products are called masters, while others are called technicians. Whether manual, semi-automatic or fully automatic operation, human factor always comes first. Offset printing starts from the first sheet to the last sheet, and the parameters change little in the process, while screen printing is different. Screen printing process parameters have been changing, such as screen tension, screen deformation, scraper blunt and so on.
Therefore, entering the screen printing industry, although the threshold is low, it needs to pay more arduous efforts to do fine and thorough. In screen printing factories, the quality and technical level of screen printing operators are very important. Training workers has become a very necessary link for large and small screen printing factories to improve production quality. Don’t mistakenly think that managers will produce good products with quality awareness and critical vision. Quality Control And Management Of Small Screen Printing enterprises
The speed of leadership is not the speed of the enterprise, and the products are finally made in the hands of workers, Only when workers have a sense of responsibility and scientific quality control strategy can they produce products with market competitiveness.Quality Control And Management Of Small Screen Printing enterprises
① It has absolute whiteness, that is, it does not absorb all kinds of light at all. In this way, high image gradient contrast can be printed. In addition, unnecessary optical dot increase can be avoided because light enters the paper near the dot and is absorbed by the dot from the inside of the paper.Quality Control And Management Of Small Screen Printing enterprises
·In fact, paper with absolute whiteness does not exist at all. No paper can completely absorb external light. In the printing process design project, what we need to do is to select high whiteness paper (except for products with special process requirements of course) within the allowable cost range to meet the requirements of image reproduction, so as to achieve a richer level.
② Good gloss. Similar to the above, but the difference is that the greater the gloss is, the better. Too much gloss forms an obstacle to normal reading of printed matter.
③ Smoothness. The smoothness of the paper refers to the roughness of the paper surface. The ideal smoothness of the paper surface should be at least 500 seconds. In printing, if the smoothness of the paper is too low, it will easily cause the loss of high-profile dots, the consolidation of low-profile dots and the emptiness of the field.
· It is also due to the consideration of printing cost (sometimes due to the special effects of printed products, such as cloth paper), it is impossible to use high-quality and smooth paper for printing every kind of printed products. When the paper with low smoothness is encountered, the number of printing screening lines should be appropriately reduced in the process design, and the printing pressure should be appropriately increased in the printing process to make up for the surface smoothness of the paper.
It has neutral pH value. Acidic paper will cause the ink to be unable to dry in time in the printing process, which will lead to the excessive emulsification of the ink in the printing process. Therefore, a series of quality problems will appear in the printed matter, such as the rubbing of the printed matter, the fuzzy edge of the dot, the increase and deformation of the dot, etc. When the pH value of the paper itself is alkaline, it will react with the pigments of many kinds of inks, resulting in the fading of the printed matter after printing, especially in the printing of gold and silver ink.
·I n the selection of paper, we should try to select the paper close to neutral. However, if the paper has been selected and the pH value has been determined, we should compensate the pH value of the paper to a certain extent through the acidity and alkalinity of the wetting solution during the printing process. The general effect is also obvious.
⑤ Shape stability of paper. The ideal paper should not deform, either under the action of printing pressure or under the wetting of fountain solution. In this way, overprint can be ensured in the printing process to avoid a series of problems caused by paper deformation.
· What we need to do is not to choose the paper that is not deformed at all, but to make a trade-off between the cost and the paper with high shape stability in the process design process. For example, due to the low cost and low quality requirements of newspaper printing, the shape stability is not very important when selecting paper, and newsprint can be accepted. For the printing of printed materials such as maps, we must choose paper with good shape stability to avoid overprint problems caused by paper deformation and changes in the size of finished products.
The surface strength of the paper. The ideal paper is required not to remove powder and hair in the printing process, so as to avoid the wear of the printing plate and the reduction of image quality due to the adhesion on the blanket, printing plate and ink roller.Quality Control And Management Of Small Screen Printing enterprises
· The paper we use in the printing process will generally lose powder and hair more or less in the printing process. In addition to selecting the paper before printing, we must judge the surface strength of the substrate during the printing process, and timely clean the paper powder and other foreign matters on the printing plate and blanket.Quality Control And Management Of Small Screen Printing enterprises
A strand of paper. The ideal paper has no silk direction, and the strength of the paper is large enough. But as long as we consider the cost, we can’t help using silk oriented paper. In printing, we must pay attention to the consistency between the wire direction of the paper and the paper direction of the printing press, which can greatly improve the overprint level.Quality Control And Management Of Small Screen Printing enterprises