Focus on Stretch Film, Paper Doilies manufacture for 10 years.

About Printing

    Plate printing is to transfer the image and text dots on the original plate of color separation plate making pictures to the printing plate in a photosensitive way. For lithography, it is also necessary to make the image and text dots of the printing plate have the performance of Pro ink and the blank part have the performance of hydrophilic rejection of ink. Improve The Printing Resistance Of Gravure Plate  In Production

     This image transfer procedure is lithography plate printing. Only by drying the original pictures into a printing plate, forming inked pictures and texts, and then transferring them to paper through printing, can the reproduction of pictures and texts be completed.About Printing

Improve The Printing Resistance Of Gravure Plate In Production

        Plate printing is a bridge process between plate making and printing. For color separation plate making, it is required to transfer the graphics and text of the original image without deformation. For printing, it is required that the ink affinity of the graphic part and the hydrophilicity of the blank part should be clear. At the same time, it should be able to withstand tens of thousands of embossing friction without changing its inking and hydrophilicity.Improve The Printing Resistance Of Gravure Plate  In Production

      However, since it is an intermediate transfer process, changes are bound to occur. In order to ensure its stability and less changes, it is necessary to control the photosensitive performance of the plate, the printing operation process, the image transfer data, and the adaptability to printing in the overall standard data of the plate making and printing process, so as to ensure the smooth and good completion of reproduction.Improve The Printing Resistance Of Gravure Plate  In Production

      Plate printing should go through twice in the whole reproduction process, one for proofing and one for printing. Therefore, plate printing is very important in the whole reproduction process. Its quality directly affects the print quality and printing efficiency. Improve The Printing Resistance Of Gravure Plate  In Production

     However, there are many problems in the current printing process. For example, most of the proofing and printing use different plates, and their dot changes are very different; About Printing

     The dot expansion of proofing and printing is inconsistent, which needs to be reasonably adjusted through printing; The quality of the drying version is unstable, resulting in more rework. Therefore, it is an urgent and important work to strengthen the standardized and data-based quality management of plate printing process to stabilize and optimize the quality of plate printing.About Printing

       According to the production order and process design sheet, conduct a comprehensive inspection on the original plate to be dried, whether the pictures, graphics, text, shading and other contents in the layout are complete, whether the color number of the color plate is complete, Improve The Printing Resistance Of Gravure Plate  In Production

     whether the space of each color plate is accurate, whether the picture direction is correct, whether the pasting is firm, and the adhesive tape should be more than 7mm away from the graphics, otherwise it will affect the reality of the printing dot.Improve The Printing Resistance Of Gravure Plate  In Production

      Whether the auxiliary contents of the layout, such as overprint cross gauge line, corner line, center line and cutting line, as well as color code and control strip, are pasted completely and accurately. The covering mask that needs to be exposed in several times, the table paper mask and its positioning of the set of picture collage and printing, and the layout arrangement of the repeated distribution and continuous printing shall be checked.Improve The Printing Resistance Of Gravure Plate  In Production

      Then check whether the original graphics are clean, and whether the blackness and reality of dot and text meet the printing requirements. For the inferior quality original that has to be used, the data shall be adjusted and remedied during printing according to the virtual reality and density of its dot.Improve The Printing Resistance Of Gravure Plate  In Production.About Printing

      Clarify the production instructions and process design arrangements, and decide to adopt printing methods such as single drawing printing, composition printing, set drawing printing or continuous printing. Determine the way, order and number of layout according to the process design requirements of printing, cutting and binding.Improve The Printing Resistance Of Gravure Plate  In Production.When printing a single picture, the compositor or printer shall make a covering mask (also known as falling sun mask) for positioning with the picture, so as to make a positioning secondary exposure after (or before) printing the picture, and expose the unnecessary stains outside the picture.Improve The Printing Resistance Of Gravure Plate  In Production.About Printing

      When it is necessary to manually double (or multiple) assemble and print the original picture, the shading composite paper with exposure and cross lines shall be made according to the layout, so that the cross lines can be exposed before printing, and the single picture plate can be assembled and dried one by one. And prepare shading materials to protect the parts that are not exposed temporarily.Improve The Printing Resistance Of Gravure Plate  In Production

      When making a set of drawings for printing, the process method is basically the same as that of the set of drawings for copying. According to the set of drawings layout, generally, the compositor shall make the set of drawings for positioning with the pictures, position with the plates, and make a covering mask for exposing the stains outside the drawings.Improve The Printing Resistance Of Gravure Plate  In Production.About Printing

      When using the continuous drying machine for continuous printing, the number, form, position and spacing of graphic layout, as well as the vertical and horizontal moving sequence and moving size of pictures shall be calculated and designed according to the printing layout. Based on the layout, make the original shading frame or paste the shading red tape outside the original drawing, and paste the original on the printing frame according to the accurate position. And make a falling sun mask that covers the whole layout graphics.IAbout Printing

      Determine the plate, plate size and jaw size according to the production order. Make positioning and punching (it is better to use a unified positioning system for making up, printing and printing), arrange the original in a designed way according to the requirements of the original and printing layout, review the person who needs shading, prepare the backlight materials, and start the printing operation when everything is ready.Improve The Printing Resistance Of Gravure Plate  In Production

     The printing process of positive PS plate mainly includes printing, development, dirt removal, plate baking, application of developing ink and other processes. There are two main ways to do a good job in the standardized quality management of printing process:Improve The Printing Resistance Of Gravure Plate  In Production

      first, find out the main factors affecting the quality of each link in the printing process; Second, do everything possible to stabilize these factors.Improve The Printing Resistance Of Gravure Plate  In Production.About Printing

     The determination of print quality specification data should ensure two points: first, correctly reproduce the image and text tone of the original; The second is to make the dried version easy to print, that is, the layout has a stable printing foundation, the oil and water repellency of the graphic part is good, and the hydrophilic and oil repellency of the blank part is good.Improve The Printing Resistance Of Gravure Plate  In Production

      The printing process should completely transfer the image tone and dot on the original plate to the printing plate. Theoretically, the more faithful the transferred image tone and dot, the better. According to the principle of equal geometric position, Improve The Printing Resistance Of Gravure Plate  In Production

     the plate corresponding to 1% and 99% is qualified. When 1% – 2% bright dots are not exposed, it means that the printing time is too long, while 98% – 99% dark dots are pasted, it means that the printing time is not enough.Improve The Printing Resistance Of Gravure Plate  In Production.About Printing

        Only 1% and 99% or 2% and 98% black and white dots can be correctly exposed, which is the ideal printing quality. However, in the actual production, due to the influence of various conditions, it is very difficult to completely and faithfully correspond to the printing, Improve The Printing Resistance Of Gravure Plate  In Production

      and there will always be some changes. The standardized quality management is to make the smaller the range of this change, the better, so as to stabilize the printing quality and optimize the printing quality.Improve The Printing Resistance Of Gravure Plate  In Production.About Printing

The main factors affecting the printing quality are as follows.Improve The Printing Resistance Of Gravure Plate  In Production

       There are two important indicators for the quality of the original dot as follows: the dot density should be high. In order to achieve effective exposure, the part covered by the dot should not be allowed to pass through. Therefore, the dot must have sufficient density. The density of a single dot should be more than 3.0 and the field density should be more than 4.5. Improve The Printing Resistance Of Gravure Plate  In Production.About Printing

     The common problems in actual production are: first, the dot density is insufficient, especially 1% – 2% small black spots are gray; Second, improper plate repair corrosion, resulting in gray and yellow dots, affecting the quality of printing. Improve The Printing Resistance Of Gravure Plate  In Production.The dot should be smooth without virtual halo. Each dot requires its center density to be consistent with the edge density, so as to expand the tolerance of exposure time and achieve faithful transfer.Improve The Printing Resistance Of Gravure Plate  In Production.About Printing.About Printing

 

     The correct exposure should be matched by the correct development. The development conditions include the chemical composition of the developer, temperature, development time and mechanical stirring. Before using the automatic developer for development, the developer shall be stirred circularly to keep the drug solution uniform and constant temperature. The temperature of the developer is generally 20-25 ℃, and improper temperature will cause incomplete or incomplete display. Accurately control the developer concentration. Different developing solutions should be selected according to different types of plates. Improve The Printing Resistance Of Gravure Plate  In Production

     Now most of them use cheap strong bases such as sodium hydroxide as the main agent, and the dosage proportion is large and the drug power is strong. The general formula is 10000ml water, 50g. Although the developing solution is fast, About Printing

     it has the disadvantages of etching and dissolving the oxide layer and photosensitive layer on the surface of the plate base, and also destroys the hydrophilic property of the surface of the plate base. At present, many weak bases such as sodium silicate are used as the main agents at home and abroad.Improve The Printing Resistance Of Gravure Plate  In Production

      Although the price is high, it has fast development speed, long service life, and can increase the hydrophilicity of the layout and the printing resistance of the printing plate.Improve The Printing Resistance Of Gravure Plate  In Production.About Printing

     The standard for accurately controlling the developer concentration should be tested with a test strip. It should be exposed and developed according to the normal time. After development, the hollow spots are relatively clear and the corresponding small black spots are relatively firm, which proves that the developer concentration is standard.Improve The Printing Resistance Of Gravure Plate  In Production.About Printing

      If the small black spots are lost too much, it means that the concentration is too high. If the hollow spots are pasted, it means that the concentration is too low. The main agent content of the developer shall be increased or decreased according to this.About Printing