The structure is diverse, the convex and concave changes are many, and the printing format is small. It is difficult to meet its requirements using traditional conventional printing processes. More flexible printing methods such as pad printing, inkjet printing, screen printing, and letterpress offset printing should be considered. The uneven surface of the paper-molded packaging products can realize multi-color exquisite printing.
1. Surface screen printing method of paper-molded packaging products
The screen printing method is to place the thick ink on the screen plate, and then use the scraper to contact the screen plate and form a certain angle, and move while applying pressure, so that the printing ink is missed through the screen plate On the substrate.
The manual screen printing method uses a squeegee, which can be used to complete both printing and ink scraping. The mechanical screen printing must have two scrapers for scraping and ink scraping. The two scrapers alternately move back and forth. The scraping scraper squeezes the ink for printing. The return scraping scraper is lifted off the screen. In order to have enough ink when the scraping scraper scrapes again, the scraping scraper scrapes the ink back to the initial position of the ink, so as to continue printing.
The main features of screen printing are simple plate-making and printing methods, low equipment investment, low cost, suitable for small batch production; it is not limited by the type, size, and shape of the substrate, and can be printed on curved surfaces, spherical surfaces, and fragile objects. It is also suitable for the surface printing of paper mold packaging products whose structure and shape change a lot, and its printed ink layer is thick, colorful, colorful and strong in hiding. Therefore, small screen printing equipment can be used to print on the surface of paper-molded packaging products.
2. Surface inkjet printing method of paper mold packaging products
Paper-molded packaging products have a lot of uneven changes in their structure, and inkjet printing can also be used to complete the decoration printing on their surfaces. Inkjet printing is a non-contact plateless imaging printing method. It uses a computer to store information without storing graphic information on the printing plate. The print head does not touch any part of the substrate and can change in operating conditions. In the case of a wide range, clear characters and patterns are reliably printed on each uneven surface of the paper-molded packaging product.
The principle of inkjet printing is to eject tiny ink dots from one or more print heads through the gap to the surface of each paper molded product located on the production line to form letters and patterns composed of dot matrix. The printing machine uses a microprocessor to control the required text patterns, and keeps pace with the speed of the production line through the role of the sensor to ensure that each paper-molded product can be printed with graphic information correctly. Ink jetting is done by pressure or static electricity, and can be printed horizontally from bottom to top, top to bottom, or from any angle. It is especially suitable for surface printing of paper mold packaging products with many shapes and shapes.
3. Surface printing method of paper-molded packaging products
According to the printability of the paper mold material and the structural characteristics of the paper mold product, the printing technology can be used to complete the decoration and printing of its surface. Pad printing is an indirect printing method. It uses a silicone rubber cast hemispherical printing head to press against a copper or steel gravure layout. The graphic ink on the layout is stained and then transferred to the substrate to complete the printing. . It can complete multi-color exquisite printing on irregular concave and convex surfaces.
Pad printing is ideal for small printed products such as paper-molded packaging products with small graphic area and changeable geometry. It is ideal from the consideration of equipment investment, cost accounting, and easy operation.
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