How to improve the problem of UV printing plate dropping

After using UV car wash to scrub the printing plate, blanket and ink roller, and then continue to print, the image information on the printing plate cannot be transferred and copied to the substrate completely, showing the printing phenomenon that the printed image is partially lost or the dots are lost. . Since the final printed image shows that the percentage of dots on the substrate is lower than the percentage of image dots on the corresponding printing plate, it is commonly known in the industry that the printing plate "drops the screen".

The reason for the "plate-off" phenomenon of the printing plate may theoretically be the bad ink transferred from the ink roller to the printing plate, which makes the ink on the image dots on the printing plate poor; or it may be the bad ink on the blanket transfer printing plate, The ink transferred to the substrate is not good; it may also be due to the abrasion of the image on the printing plate, which can not effectively transfer the ink. The main reason for the general "plate-off" problem of the printing plate is that the ink roller and the blanket have poor ink transfer, and the printing suitability of the rubber material has changed due to the corrosion of the UV ink. The connecting material of UV offset printing ink is composed of unsaturated acrylic monomers or prepolymers. It has different properties from the connecting material of traditional oxidized conjunctive drying inks (mainly alkyds). The unsaturated acrylic monomer of UV offset printing ink has strong erosion, will cause the erosion and expansion of synthetic rubbers such as ink rollers and blankets, resulting in the dimensions, elasticity and resilience of the ink rollers and blankets The drop makes UV ink transfer poor. The consequence of poor printing ink transfer is necessarily the loss of some dots in the printed image, which results in the loss of image tone gradation and color deviations.

To avoid the use of UV car wash water to wash the ink roller and blanket after printing plate "off the screen" problem, the solution is to choose UV car wash water suitable for UV ink cleaning, to achieve thorough cleaning of residual ink on the ink roller and blanket, to avoid The erosion of the unsaturated acrylic monomer in UV ink to the ink roller and blanket. If the selected UV car washing water is not suitable, it will not only cause continuous damage to the rubber tissue structure of the residual UV ink on the ink roller and blanket, but also cause a lot of waste of cleaning materials, which will adversely affect the printing quality and printing efficiency. .

In recent years, due to the better printability of UV inks than ordinary offset inks, the application of UV inks in the offset printing process has become more and more widespread. However, the characteristics of UV inks different from ordinary offset printing inks have not been fully understood by printers, and various UV printing failures have occurred. Only by fully understanding the printing suitability of the ink rollers and blankets used in UV printing, and the UV car wash water suitable for its use, can the problem of printing plate "off the net" be avoided. At present, there are many brands of UV car wash water on the market, but their performance and price are different. Printers should understand through research and choose high-quality brand UV car wash water suitable for the ink rollers and blankets used by the company.

Product categories of Sports Duffel Bag, we are professional China manufacturer of all kinds of Sports Duffel Bags, Nylon Sports Duffel Bag, Light Weight Sports Duffel Bag for people who like do sports. This sports duffel bag is super soft and lightweight, and have a good quality which is durable. It is a nice Duffle Bag for sports, travel, workout, hiking, camping, overnight activity, suitable for both adults and kids. We have cooperated with many famous brands allover the world. We can do OEM or ODM for our customers. We have the perfect after-sales service and technical support. Contact us today to establishing new and goods business relationship.

Sports Duffel Bag

Sports Duffel Bag,Basketball Duffle Bags,Gym Duffle Bag,Large Duffel Bags

Panway Industries Co., Ltd. , https://www.panwaybags.com

Posted on