With the development of the commodity economy and the increase in the level of new products for packaging and printing, the use of UV wrinkles in the packaging and printing of tobacco, wine, health products, and cosmetics has become more and more frequent in recent years. UV wrinkle ink printed on the metal foil paper or aluminum coated card paper produced by the effect of three-dimensional effect, the product is luxurious and elegant, smooth and flexible and so on. This article briefly introduces the use of UV wrinkle ink process, for reference only.

First, prepress

1, before the selection box stretches the net to choose the net frame first, the semiautomatic screen printing machine or the automatic screen printing machine mostly uses the aluminum alloy net frame, the aluminum alloy net frame's strength is big, the light and durable, should not distort and receive the masses of customers welcome.
2, the election network Machine printing UV ink, generally used in tension, uniform mesh, small scalability polyester screen (commonly known as polyester screen).
3, stretch net Use pneumatic stretch machine or mechanical manual pull machine, stretching tension should be between 18-22N/cm. The angle of the stretch net is between 25°-60°, depending on the accuracy of the print.
4, coating photosensitive adhesive The effect of the printed matter determines the thickness of the photosensitive adhesive, usually 10-40um can be. When UV screen printing inks used for wrinkle inks are printed on the screen, they are usually 2-4 times printed on the back side, 2 times on the back side, and can be completed on both sides at the time of coating, and once in the middle. The same screen, photopolymer thickness, print a strong sense of three-dimensional.
5, printing version The printing time depends on the number of screen mesh, the thickness of the photosensitive film, and the fineness of the film. Such as 200 mesh screen, 3KW iodine lamp, printing time 70-90S can be. The dried screen plate was washed, checked and repaired, and used after drying.

Second, printing

1. Debugging printing Take semi-automatic screen printing as an example: Firstly, fix the dried screen plate on the screen printing machine, check the pressure of the ink blade and the blade and adjust it. Scrapers are generally made of solvent-resistant 70°-80° imported scrapers. They require sharp and smooth scrapers. The pressure is basically the same as the screen tension. The scraper angle is between 40°-60°, depending on the requirements of the prints. The blade angle is low and the pattern is small. On the contrary, the pattern is large. Check the flatness of the platform and the strength of the suction. Adjust the distance between the screen and the platform. The distance between the screen and the platform is about 5-10mm. Adjust the distance from the network.

2, printing and UV light solid UV wrinkle ink to be even before printing, no bubbles, thin consistency to print without ink can easily print. The pattern size of UV wrinkle ink in printing is related to the printing speed. The printing speed is fast and the pattern is small. On the contrary, the pattern is large. UV light solid requires light curing machine to install the crumpling device, the light source is 20-40WUV light, the power is between 60-100W, the distance between the UV crumpling device and the UV light solid light is not less than 1.2 meters, otherwise, The printed product was not UV wrinkle and was not wrinkled by the UV crease device. The pattern could not be drawn and the wrinkle could not be achieved. The power of the UV light-solid lamp is not less than 3KW, and the speed of the conveyor belt depends on the light-curing effect of printing, generally between 18-25m/min. The power of the UV creping device and the distance from the conveyor belt directly affect the pattern of the product. The power of the UV crease lamp is large, and the speed of the conveyor belt is faster. On the contrary, the power of the UV crease lamp is small, and the speed of the conveyor belt is slow. The pattern also has different changes. The specific requirements depend on the printing speed, the power of the UV crumpled lamp, the power and distance of the UV crumpled lamp and the UV light fixture, and the speed of the conveyor, depending on the requirements of the printed product.
In summary, the effects of UV wrinkle printing on the number of mesh screens, screen tension, thickness of emulsion, printing pressure, squeegee angle, printing speed, power of UV crumpled lamps, and UV crumpled lamps The distance between the UV light fixture and the speed of the conveyor belt are closely related. Adjusting the process in each process properly can achieve the desired results.

Author: Zhejiang Pujiang US Adorno Ink Chemical Co., Ltd. Zhou instruments