How to see printing problems from the use of printing equipment and consumables? At present, the printing of packaging cartons is booming, and customers have increasingly higher requirements for product quality. How to avoid production problems and improve product quality have become the pursuit of enterprises. Printing is a systematic project and a dynamic process. Equipment conditions, technical personnel level, ink and printing materials are all factors that affect product quality. There are three main ways of carton printing: offset printing before mounting, flexographic direct printing, pre-printing and offset printing. With the improvement of printing technology, flexographic printing has been adopted by carton companies with its high quality and high efficiency. This requires companies to start small and improve printing problems.
Printing equipment is one of the five major elements of printing. Good printing equipment is a prerequisite for producing high-quality products. The use status, precision adjustment, and good maintenance of printing equipment directly affect product quality. Pay attention to the pressure adjustment. The ink transmission and printing parts of the flexographic printing machine have four cylinders, an inking roller, an anilox roller, a plate cylinder, and an impression cylinder. The following figure shows the schematic diagram of the ink transfer part of the flexographic printing machine. The appropriateness of the pressure between the four directly affects the ink transmission, which in turn affects the product quality.
The printing pressure is the pressure between the plate cylinder and the impression cylinder. Its main function is to evenly transfer the ink on the plate to the substrate. Many problems in the printing process are caused by improper pressure adjustment, such as too large or too small ink. If the printing pressure is too heavy, on the one hand, it is easy to make the lines thicker on the printing material, the dots are expanded, and the accuracy of the graphics and text is reduced. In addition, excessive embossing force will also deform the ribs and reduce the strength of the cardboard. If the pressure is too light, the appropriate amount of ink cannot be transferred on the substrate, the ability to reproduce graphics and text is poor, the lines are prone to broken lines, and the defects of imprinting are prone to occur on the ground, which directly affects the printing effect. In serious cases, the printing cannot be performed . The adjustment of the printing pressure is suitable for the ink to be uniform and moderate, the ink trace is clear, the ridge surface of the tile is not depressed, flat and not deformed.
Once the pressure is determined, do not adjust it casually. n Printing inking pressure Printing inking pressure is the pressure between the anilox roller and the printing plate. Its main function is to evenly transfer the ink from the anilox roller to the printing plate. In actual operation, the influence of the printing plate inking pressure on the printing quality is very important. If the inking pressure is too heavy, the printing plate is easy to insert ink, which affects the quality of the product and also affects the printing durability of the printing plate. , The printing plate can not be printed without ink. Therefore, attention should be paid to the adjustment in the printing process to ensure that the printing can be carried out smoothly.
This pressure is the pressure between the inking roller and the anilox roller, which controls the thickness of the ink, that is, the amount of ink, and evenly transfers the ink. The pressure is inversely proportional to the thickness of the ink layer. Will make the ink layer too thin, otherwise it will make the ink layer too thick. If the amount of ink changes during the printing process, you should first check whether the pressure has changed and adjust it carefully. These three pressures are related to the entire ink transfer process from the ink tank to the cardboard, and are the key to the amount of ink on the cardboard and whether the printing is uniform. Pay attention to the adjustment of equipment accuracy. In the printing process, the printing plate cylinder, impression cylinder, anilox roller, inking roller and various transmission gears, etc., due to various factors, may have their own accuracy and adjustment accuracy Changes occur, which affect the accuracy and quality of printed images. In the printing process, you should check carefully to find the problem and solve it in time.
The precision adjustment between the rollers mainly has the problems of concentricity and parallelism. The concentricity mainly includes the concentricity between the roller body and the supporting journal and between the rollers. These two concentricity must be adjusted. When the printing machine is in normal operation, the vibration error cannot exceed 0.01mm, otherwise there will be failures in ink transmission and dot printing. The idea is to expand the idea, but the image dots are not clear or not printed. Gear accuracy is the basis to ensure the concentricity of the rollers. The change of the transmission gear accuracy will cause mechanical defects such as micro-vibration, which will bring certain difficulties to screen printing and make it impossible to obtain an ideal pressure for the entire printing. Mechanical vibration will also damage the anilox roller and the printing plate, affecting the service life and product quality. Parallelism mainly means that the relative positions of the axes between the two rollers are parallel.
If the axes of the two rollers are not parallel, the gap between the two ends will be different, resulting in a difference in pressure between the rollers and affecting the amount of ink transfer. Taking the impression cylinder and the plate cylinder as an example, the end with a small gap has a high pressure and sufficient ink for the printed matter; the end with a large gap has a small printing pressure and a small amount of ink transfer, making the printing ink light.
Corner desk is a type of desk specifically designed to fit into the corner of a room. It is a space-efficient solution that maximizes the use of corner areas, making it a popular choice for home offices, bedrooms, or any room where space is limited. Here are some key features and aspects of a corner desk:
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Shape and Configuration: Corner desks are typically L-shaped or sometimes even U-shaped, with one side of the desk extending along each wall of the corner. The L-shape provides ample workspace, allowing you to have separate areas for different tasks, such as computer work, writing, or organizing.
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Space-Efficient Design: The primary advantage of a corner desk is its space-efficient design. By utilizing the corner of a room, it makes the most of the available space and provides a large work surface while minimizing the footprint of the desk. This is particularly beneficial in smaller rooms or home offices.
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Work Surface: Corner desks offer a generous amount of work surface area. The size and dimensions of the desk can vary, so you can choose one that suits your specific needs and available space. The work surface can accommodate a computer, monitor, keyboard, and other work essentials, providing ample room to spread out and work comfortably.
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Storage Options: Many corner desks come with built-in storage features to help keep your workspace organized. These can include drawers, shelves, or cabinets for storing office supplies, files, books, or other items. Consider your storage needs and the available storage options when selecting a corner desk.
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Versatility: Corner desks are versatile and can be used in various settings. They are commonly used as home office desks but can also be placed in bedrooms, living rooms, or any room where a workspace is desired. They can be used as a dedicated workstation or as a multifunctional surface for various tasks.
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Ergonomics: Consider the ergonomic design of the corner desk, such as the height of the work surface and the placement of keyboard trays, to ensure a comfortable and productive workspace. Adjustability features, such as height-adjustable desks, can further enhance ergonomic support.
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Style and Material: Corner desks are available in a wide range of styles, designs, and materials. You can choose from various finishes, such as wood, metal, glass, or a combination, to match your existing decor and personal style preferences.
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