Offset experience: adhere to the "three Qin" in the printing process
We are a big printing company in Shenzhen China . We offer all book publications, hardcover book printing, papercover book printing, hardcover notebook, sprial book printing, saddle stiching book printing, booklet printing,packaging box, calendars, all kinds of PVC, product brochures, notes, Children's book, stickers, all kinds of special paper color printing products, game cardand so on.
For more information please visit
http://www.joyful-printing.com. ENG only
http://www.joyful-printing.net
http://www.joyful-printing.org
email: 860681365@qq.com
1, diligently check the printed sheets
Diligent inspection of the printed sheets means that the quality of the products is constantly checked during the printing process. During the lithographic offset printing process, various conditions may occur, which may affect the quality of the product, resulting in a large number of defective products or even waste products. Therefore, in the printing operation, it is indispensable to check the printed sheets.
Checking the printed sheets includes the following: check the overprinting accuracy, check the ink color, check the quality of the dots, check for dirty spots, white spots, pastes, and patterns.
2, mixing the ink fountain
Diligent mixing of the ink fountain means that the ink in the ink fountain is stirred at intervals during the printing process. Stirring the ink fountains in a timely manner ensures the continuous underground ink, which is the prerequisite for ensuring uniform ink color before and after the print.
The ink is a plastic fluid having a thixotropic property in which the fluidity gradually changes with the action of an external force. That is, when the temperature is kept constant, the ink is gradually weakened and softened by applying a certain external force to the stationary ink, and the rheology becomes good. When the external force stops stirring, the ink gradually becomes thick and hard, and the fluidity changes. difference. If the ink fountain is not stirred for a long time, the ink fluidity is deteriorated, the ink in the ink fountain is poor, and the ink is blocked or not inked. The ink roller is difficult to disperse ink and the ink is difficult to be inked. The intermediate breakage of the ink causes the remaining ink layer to protect the layout and cause the release. An ink agitator can be installed in the ink fountain to stir the ink at a constant speed to increase the fluidity of the ink. The ink in the fountain can also be agitated with an ink knife.
3, check the layout moisture
Diligently viewing the moisture in the layout means constantly checking the moisture content of the printing plate during the printing process. In the process of printing operation, correctly grasping and controlling the moisture of the layout to achieve the balance of ink and water in the printing process, and correctly identifying the moisture of the layout is an important prerequisite. Identification method of the moisture content of the layout during production:
1 visual method. In daily production, visual inspection is usually carried out based on the operator's experience. The method is to use the illumination lamp to slant the layout, and judge the size of the moisture according to the intensity of the reflection of the layout; the thicker the water film, the stronger the reflection, the thinner the water film is. The light is weaker.
2 According to the phenomenon of print defects. If there is a paste plate or dirty plate, please pay attention to whether the moisture of the plate is too small; if the print is dull, stenciled, curled, and the paper is not properly received, the moisture of the plate may be too large.
In the printing process, if you can adhere to the "three flat, three diligent, two small" process measures, you can stabilize and improve the output and quality of offset printing products.