Research on Printing Process of Pulp Mold Packaging
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The pulp molded products have various structures, many changes in convex and concave, and the printing width is small. It is difficult to meet the requirements by the conventional conventional printing process, and relatively flexible printing methods such as pad printing, inkjet printing, screen printing, letterpress offset printing, etc. should be considered. , complete the multi-color beautiful printing on the concave and convex surface of the paper mold packaging products.
1 surface printing method of paper mold packaging products
The screen printing method is to place the thick ink on the screen plate, then use the squeegee to contact the screen plate and form a certain angle, and move while applying pressure, so that the ink is leaked through the screen plate to the printing plate. On the substrate.
The manual silk screen method uses a squeegee to simultaneously perform both the squeegee and the squeegee. The mechanical silk screen must have two scrapers for squeegee and squeegee. The two squeegees are alternately reciprocating, the squeegee squeegee is pressed and the ink is printed, and the returning squeegee is lifted off the screen. In order to have sufficient ink for the scratching of the squeegee, the squeegee scrapes the ink back to the initial position of the ink to facilitate printing.
The main features of screen printing are simple plate making and printing methods, low equipment investment and low cost. It is suitable for small batch production; it is not limited by the type, size and shape of the substrate, and can be used for printing curved surface, spherical surface and fragile material. The surface printing of paper-mold packaging products with more structural shape changes is also suitable, and its printed ink layer is thick, colorful, three-dimensional and opaque. Therefore, the surface of the paper package product can be printed using a small screen printing device.
2 surface inkjet printing method of paper packaging products
The paper mold packaging product has many irregularities in its structure, and the surface printing and printing can also be completed by inkjet printing. Inkjet printing is a non-contact, non-version imaging printing method that uses a meter to store information without having to store the graphic information on the printing plate. The printing head does not touch any part of the substrate and can be changed in operating conditions. In a wide range, clear text and patterns are reliably printed on the respective concave and convex surfaces of the paper package product.
The principle of inkjet printing is to inject tiny ink dots from one or more jetting heads through the slits onto the surface of each of the paper moldings located on the production line to form a lattice of characters and patterns. The printing machine uses a microprocessor to control the required text pattern, and the speed of the sensor is synchronized with the speed of the production line to ensure that each paper molding can correctly print the graphic materials. The ink is sprayed by pressure or static electricity, and can be printed from the bottom to the top in the horizontal direction, from top to bottom, or from any angle, and is particularly suitable for surface printing of paper mold packaging products having a variety of structural shapes.
3 paper printing methods for surface printing
According to the printing suitability of the paper mold material and the structural characteristics of the paper mold product, the surface printing and printing can be completed by using the pad printing technology. Indirect printing is a printing method in which a silicon carbide-cast hemispherical head is pressed against a copper or steel gravure plate, the graphic ink on the plate is smeared, and then transferred onto a substrate to complete printing. . It can achieve multi-color beautiful printing on irregular concave and convex surfaces.