Plastic bottle UV network printing process

Author: mgg-Plastic bottle manufacturer

   The specific working process of the online print is as follows: The print is positioned on a rotating part of the center of the print. The rear of the bracket has a cone pump head with a container diameter anastomotic tube to prepare for printing the soft plastic container. There is a force that is compensating with the printing pressure. There is a support roller with a container outer diameter. There is a chuck that is opposite the bottom of the container, and there is a positioning pin on the chuck, which matches the position pin groove of the container bottom injection. Cone plugs, support rollers and chucks and printing masters of the printing plate, synchronous line speed transfer, printing a layout, the positioning pin of the chuck is still returning to the positioning point.

Plastic bottle printed   In theory, good printing is obtained in the plastic surface, and the surface tension should be higher than the surface tension of the ink.   PP, PE plastic non-polar polymer materials, stable chemical properties, low surface tension, additional antimoders, antistatic agents, antistatic agents, and aging agents, it is difficult to firmly bond to ink. In order to improve the printing of PP, PE plastic, it must be treated, which is not less than 3.8 × 10-2 N / m.

   (1) Flame treatment   The flame treatment is suitable for surface treatment of small plastic containers, which is to remove the plastic surface by high temperature, and melt the surface of the film on the surface of the ink.   The specific operation is: In the gas flame to be processed, the flame inner core is controlled at 6 to 19 mm, the flame core is 6 to 25 mm from the surface of the container, from 0.1 to 1.0 s, and the rotational speed is 100 to 150 rpm.   The flame contains free radicals such as -OH and -NH in an excitation state, which can be combined with hydrogen surfaces of the high polymer plastic surface, and introduce some polar oxygen-containing groups, a broken chain reaction, so that the wetting of the plastic surface Sex, adhesion is improved.

   (2) Detection of processing effects   The easiest way is to test the surface tension test pen. Select the surface tension test pen with 3.8 × 10-2n / m specification. If the tested pen crossed local liquid traces evenly spread, it does not shrink, it indicates that the processing effect is better; if the liquid marks are contracted, or the liquid marks are partially contracted, a part is not If it is contracted, the process is not sufficient. 2. Plastic bottle UV online printing process   (1) Making of screen version    1 Should choose yellow, high strength, low extension polyester wire mesh for more than 355 mesh / inch.

   2 Net version of the tension control in (1.8 ~ 2.5) × 103n / m.   3 Cleaning the net version of ordinary washing net, use a photosensitive glue direct method or a capillary film-based indirect method to make the screen version, and the film layer is controlled at 15 to 25 μm.   (2) Online printing   1 Print blade.

When printing the hardness, the hardness of the polyurethane double-pointed blade printing scraper should be used, and the hardness of the HS70 should be used.   2 Through the printing ink before printing.   3 Curing conditions.

In the adoption, high pressure mercury lamp, the wavelength range of the transmitted light wave is 280 to 380 nm, the peak value is preferably between 365 nm, the power is 80 to 120 w / cm; the curing speed is adjusted according to the demand of light curing energy. (3) Printing environment   The viscosity of the UV ink is highly affected by temperature. High temperature, the viscosity of the UV ink is low, printed, which is easy to produce faucets and paste.

The temperature is low, the viscosity of the UV ink is high, and the curing is not complete. Therefore, the UV ink needs to be refrigerated in summer, and the temperature of the screen printing cannot be too high. The UV ink should be taken from the cold airborne bin in winter and appropriately reducing the curing speed.

   The temperature of the printing workshop is generally controlled at 15 to 25 ° C.