Quality control management of the hottest small sc

  • Detail

Quality control and management of small silk printing enterprises

release date: Source: medium paper

in the packaging and printing industry, printing technology is not only a printing technology, but also a widely used industrial technology. To improve the product quality of small printing enterprises, we must understand the characteristics of printing and recognize the essence of printing work. Besides larger enterprises in the fields of packaging, circuit board, printing, etc., small Decentralization can be said to be one of the characteristics of the industry. If the industry pursues scale in the application industry, from the market-oriented point of view, it is inevitable to diversify products in order to obtain a larger market share to suppress higher and higher operating costs. For small printing enterprises with fewer staff and less professional experience, product diversification will sharply increase the difficulties in quality control, and even make quality management out of control. Today, we will start with the printing content of Chinese paper tape and introduce the relevant quality control in detail

managers of small printing enterprises will have such troubles, and 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, which often makes business managers physically and mentally exhausted, and the 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 can't be done accurately or thoroughly. If the quality index required by the customer is 100, it can only achieve 95. A mere 5 points is the difference between amateur and professional. If small 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 parameter change 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 partial glazing for printing, and wins millions every year. The development strategy of an enterprise should be to refine and thoroughly develop a major before diversifying its products. Diversified products also need to consider whether previous production experience can be replicated. If knowledge and technology in another field are involved, we need to be cautious. The above description is about the business strategy of Indian enterprises, which seems to have little to do with quality management. In fact, it is not. Quality management strategy is subject to business strategy. If every production is a try of new products, it is only suitable for laboratories in R & D departments, not in highly competitive markets. Of course, there are also such printing enterprises, plane, curved surface, large and small, and have achieved certain development. However, due to the difficulties of quality management, customers' complaints and complaints have become commonplace. The development is always bumpy, like a drunk, and the quality of life is not high, which is not in line with the modern concept of making money and being happy

for printing enterprises, taking a professional development path is the key to solve the problem of product variety stability. Each product has its own 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 printing technology and the maturity of the market, customers have higher and higher requirements for product quality. Product quality standards are not static things. They rise with the requirements of customers. Quality standards are based on competitors or industry-leading enterprises, which also depends on the strategy of the enterprise. Of course, the higher the quality of printing products, the better. The higher the quality, the higher the cost, which means a higher scrap rate and defective rate

the quality control of printing enterprises should be a process, not a subsequent inspection after the completion of the production process, because this has failed to achieve the purpose of control. For large and small 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 that affect the 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 familiar with the printing profession to be qualified. In small enterprises, the production supervisor must have the quality awareness of being picky inside the egg, and exercise the right to issue a ticket when necessary

each printing product has its own production process and its own quality control technology. Most of these are operating technologies accumulated in practice, which are actually specialized things. For example, when printing film switches, low viscosity rollers are used to remove small dust particles on the surface of printing products. 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, many parameters of printing process are difficult to control

in the printing industry, those who make extremely fine and exquisite products are called masters, while others are called technicians for this reason. Whether it is manual, semi-automatic or fully automatic operation, the human factor is always the first. Offset printing starts from the first sheet to the last sheet, and the parameters change little in the process, while printing is different. Printing process parameters have been changing, such as version tension, version deformation, scraper blunt, etc. Therefore, although the threshold for entering the printing industry is low, it requires more arduous efforts to be precise and thorough. In printing factories, the quality and technical level of printing operators are very important. Training workers has become a very necessary part of improving the production quality of large and small printing factories. Don't mistakenly think that managers will produce good products with a sense of quality and a critical eye. The speed of leadership is not the speed of the enterprise. Products are ultimately made in the hands of workers. Only workers have the heart, coupled with scientific quality control strategies, Will produce products with market competitiveness

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 point enlargement can be avoided because light enters the paper near the point and is absorbed by the point from the inside of the paper

· in fact, there is no paper with absolute whiteness, and no paper can completely absorb external light. In the printing process design project, what we need to do is to choose 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 is 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, the smoothness of the paper is too low, which will easily cause the loss of high-key points, the consolidation of low-key points, and the emptiness of the field

· same pressure testing machine when the pressure signal acts on the sensor, it is out of the consideration of printing cost (sometimes out of the consideration of the special effects of printed matter, such as cloth paper). It is impossible to print every kind of printed matter with high quality and smoothness paper. When the paper with low smoothness is encountered, the number of printing 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

④ has neutral pH value. Acidic paper will cause oil such as microcatheter, contrast tube, guide tube and other inks to fail to dry in time during the printing process, which will lead to excessive emulsification of inks during the printing process. Therefore, a series of quality problems will appear in the printed matter, such as the rubbing of the printed matter, the blurring of points and edges, the increase and deformation of points and so on. 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, which is particularly obvious in the printing of gold and silver ink

· in the selection of paper, try to choose a paper that is close to neutral, but if the paper has been selected and the pH value has been determined, it is necessary to compensate the pH value of the paper to a certain extent through the acidity and alkalinity of the wetting liquid 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, and a series of problems caused by the deformation of the paper can be avoided

· what we need to do is not to choose paper that does not deform at all, but to try to make a trade-off between cost and paper with high shape stability in the process design. For example, the printing of newspapers requires low cost and low quality, so when selecting paper, the shape stability is not very important, and the paper 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

⑥ surface strength of 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

· 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 in the printing process, and timely clean up the paper powder and other foreign matters on the printing plate and blanket

⑦ filaments of paper. The ideal paper has no silk direction, and the strength of the paper is large enough. But as long as we take into account the cost, we have to use the paper with silk orientation. In printing, we must pay attention to the consistency between the direction of the paper and the direction of the printing machine, which can greatly improve the overprint level

(2) ink

due to the nature of offset printing (when there is too much aerobic leather, it needs to be printed with the participation of water, and the graphics and blanks on the printing plate are almost on the same plane), offset printing ink must have good water resistance, good viscosity, elasticity and very good thixotropy

① water resistance. For smooth printing, it is necessary to choose ink with good water resistance, but unlike other conditions, the water resistance of offset printing ink is not the stronger the better. Offset printing ink that completely repels water cannot be printed on the machine. This is because in the process of ink transmission, it is bound to encounter water that reaches the ink path due to high-speed cutting of the printing machine. When oil and water are completely incompatible, it will hinder the normal transmission of ink

· in printing, in order to ensure the water resistance of the ink, we add additives (desiccant, adhesive remover, ink blending oil, Anti Dirt agent, etc.) to the ink to avoid reducing the cohesion of the ink. Sometimes we also add tackifiers to the ink according to the situation to restore the cohesion of the ink, so as to achieve the purpose of restoring the water resistance of the ink. At the same time, the ink in the ink path and ink bucket should be cleaned regularly to avoid the machine

Copyright © 2011 JIN SHI