6 kinds of flexible packaging common film substrate printing points

1, BOPP printing points

BOPP is the most commonly used printing substrate. The production process is a typical plastic gravure production process; it is printed with polyamide or chlorinated polypropylene ink, with appropriate tension and embossing force, and the drying temperature is controlled below 80 °C.

2, BOPET printing points

Because PET is usually thin, it is easy to wrinkle, requires a large tension during printing, has a certain selectivity to the ink, is easy to separate from the layer with a general printing ink, the film is electrostatically large, and it is prone to blockage (not online), fluffing and Scraper marks (knife wire) phenomenon, the humidity of the workshop is good when printing.

3, BOPA printing points

BOPA is a film that is easily absorbed by moisture. Therefore, the printing machine must ensure that the ambient humidity of the printing machine should not be too high (if the environment with high humidity without dehumidification measures is not suitable for printing nylon film); the unprinted film can not destroy the original aluminum film packaging film, and should be printed immediately after opening. The nylon film should be preheated during printing (if the machine does not have a preheating device, the printing plate can be installed in the second color, and the first color is used for preheating), and the preheating temperature is 50 to 80 ° C; The printing tension should be appropriately reduced; the pressure should be moderate; the ink adaptability is strong, depending on the product structure selection, if it is a retort pouch, the cooking ink must be selected; after printing, the product must be sealed and placed in the dry and ripening room for storage, as soon as possible. complex.

4, K coating film (KOP, KPA, KPET) printing points

Because the K coating film is either roll-coated or spray-coated, its thickness uniformity is not very good, the surface is not flat, and the PVDC is just brittle. The printing tension and embossing pressure cannot be too large during printing, and the overprinting is difficult. The ink transferability is poor, and it is easy to take a flower when printing a shallow screen (some of the dots are lost), and it is necessary to use a higher hardness press roller for printing.

In addition, it is selective for the solvent. If the solvent is used improperly, the coating may be dissolved, the solvent of the printing film is large, and it is easy to stick, so special attention should be paid to drying and cooling. The printing of the matte film can be printed on the smooth surface by the OPP process, but the matte layer on the surface cannot withstand high temperatures, and the drying temperature needs to be controlled.

5, pearl film printing points

Print with surface-printed ink and use a good transparency ink. Heat shrink film printing should use a very low drying temperature, choose a special heat shrinkable ink (printed ink layer should be able to shrink by heat without falling), if it is a PVC heat shrinkable film, consider the solvent to dissolve the film. Sex.

6, unstretched PP, PE film printing points

The tension during printing is small, and the overprinting is difficult. The design of the pattern should fully consider the amount of deformation of the printing.