flexible packaging stand up pouch bagPrinting Procedure
Plastic bags, generally printed on a variety of plastic film, and then combined with the barrier layer and hot seal layer into a composite film, cut, bag formation packaging products. Among them, printing is the first line of production, but also the most important process, to measure a packaging product grade, printing quality is the first. Therefore, understanding and controlling the printing process and quality is the key to flexible packaging production.
We normally has three printing procedure.
Letter press ink
Advantages: The high quality printing, thick ink layer, bright colors, clear and bright patterns, rich screen level, moderate contrast, realistic image, three-dimensional sense
Disadvantages:press plate making process complex, high cost, long cycle.
2.Letter press ink
Advantage: simple equipment, low cost, small printing pressure, plate simple and low cost. Suitable for small quantity:
Disadvantage: printing quality is not clearer than Gravure printing. Only print small area.
Printing through the scraper squeeze, so that the ink through the mesh section of the graphic to transfer to the substrate, forming the same picture as the original.
Screen printing products rich ink layer, bright color, full of color, strong cover, ink variety selection range, adaptability, printing pressure is small, easy to operate, plate-making process is simple, equipment investment is less, so low cost, good economic benefits, a wide range of printing materials.