Many printing faults often appear in pad printing. This article summarizes the common faults in the pad printing process, and sorts out a comprehensive printing fault summary. One of the common faults: the lines and text of the printed matter are unclear and blurring occurs Possible causes and solutions: Printing head The print head is too soft: use a slightly stiffer print head; Improper selection of print head shape: Try it with a differently shaped print head. Corrosion gravure Intaglio etching is inaccurate: recreating a gravure; The depth of the gravure corrosion is too deep: Re-etch a moderately deep gravure; Inappropriate choice of gravure material type: Use a suitable gravure type (eg replace steel plate with steel plate) Improper use of screen: choose another screen to try it. Ink The ink is too thick: add some thinner to the ink; Ink thinning: Reduce the amount of thinner in the ink; The ink is drying too slowly: Replace the thinner for faster drying. Printing materials The surface of the object is not clean: the surface of the printed object is cleaned in advance; The surface is hard and granular: if possible, replace the material again, or try a stiffer print head; The surface roughness is severe: a special shape of the printing head and the printing head base device. Printed on the edge of the object: The clamp must prevent the print head from sliding. Other possible reasons Workpiece fixture has not reached enough stability: change a new workpiece fixture; High-speed printing causes the print head to deform: reduce the printing speed. If necessary, pause for a while before the ink is ready for transfer in order to restore the printhead deformation. The second common fault: Insufficient adhesion of ink This problem is very common in pad printing, because you do not understand the formula of the ink, it may be that the type of ink used is not correct. Possible causes and solutions Printing head Too much silicone rubber on the print head surface: Clean the new print head with alcohol solvent before using the new print head. Corrosion gravure The gravure erosion is too deep: Re-create a gravure plate with a moderate depth. Ink Inadequate ink type selection: Select the appropriate ink according to the specific conditions of the substrate. Duplicate inks are used: If duplicate inks are used, printing should be done with a stiffer pad Incorrect ratio of ink and hardener (hardener): Ink and hardener quantities are weighed in proportion and the ink is re-mixed. Printing materials The surface is not clean: The surface of the object is cleaned with alcohol solvent before printing. other reasons Inadequate pre-processing work or no pre-processing: Check the pre-processed program. If possible, repeat the preprocessing work; There is no requirement for fixing time: Before the pre-test ink is firmly bonded, the printed product can be fully dried and fixed; Post-processing work is not sufficient: With hot tubing, flame drying equipment is sometimes required. The third common fault: obvious pinholes appear on the printed matter If the small pinhole is large and appears in the same position on the print, check the image on the pad and intaglio. If needed, replace the pad and gravure. Possible causes and solutions Printing head The surface of the print head is damaged: replace the print head, or adjust the position of the print head so that the damaged part does not affect the printed image; The surface of the print head is too flat: replace it with a slightly sharper print head; The hardness of the print head is not enough: for a stiffer print head. Corrosion gravure Improper operation during exposure or dust, so that gravure corrosion results are not ideal: re-plate. Ink The ink is too thick: add some thinner to the ink; Ink is contaminated with silicone rubber or grease: Replace with new ink. Rechargeable Electric Shaver,Electric Foil Shavers Men,Rechargeable Electric Foil Shavers,Mini Electric Shavers Battery ZHEJIANG SHENGFA ELECTRIC APPLIAMNCES CO.,LTD , https://www.sfelectricappliances.com
The pad printing process is very simple, using steel (or copper, thermoplastic plastic) gravure, the use of silicone rubber material curved surface printing head, the ink on the gravure to the surface of the printing head. Pad printing is one of the special printing methods. It can print text, graphics, and images on the surface of irregularly shaped objects, and is now becoming an important special type of printing. For example, the characters and patterns on the surface of the mobile phone use this type of printing method, and the surface printing of many electronic products such as computer keyboards, instruments, meters, etc., is completed by pad printing. After pressing the surface of the desired object, characters, patterns, etc. can be printed.
Source: "Printing Arts" Wang Shouhong
Common problems in printing and solutions