The printing technology of flat paper has been very mature, but the pulp molding products called three-dimensional paper, the three-dimensional pulp molding products, have ever-changing shapes and various poses, and the surface is uneven in order to match the packaging. The surface printing of plastic products brings inconvenience. However, adding Logo and various patterns on the surface of the pulp molding product can make the three-dimensional pulp molding product appear more beautiful and distinctive.

Due to the complexity of the surface of pulp molded products, at present, the common methods for making Logos and patterns on the surface of pulp molded products are as follows:

1. Manufacturing method of die-casting surface pattern of pulp molded products

Logos and various patterns are engraved on the hot-pressing setting mold. During the production process of pulp molded products, the wet blank is transferred to the hot-pressing setting mold for hot-pressing setting, and the surface of the dried product will naturally have the corresponding Logo. or various patterns.

The logo and pattern produced by the molding die-casting method are relatively simple, and the logo and pattern are convex and concave on the surface of the product. On the screen-printed side of the product, it is difficult to die-cast to form a clear and obvious pattern, so the pulp-molded Logo and pattern formed by die-casting are often on the smooth surface of the product. Since the logo and pattern produced by die casting also require a certain pressure to form a clear pattern on the surface of the pulp molded product, the logo and pattern of the pulp molded product should not be printed on the side of the product but on the plane. Therefore, if the pattern die-casting method of the pulp molded product is used, the pattern is generally designed on the flat surface of the product.

2. The method of using laser to make trademarks and patterns on the surface of pulp molded products

Pulp molding product pattern laser manufacturing method is to use laser to irradiate a certain part of pulp molding product to vaporize or change color of the surface material of pulp molding product, thereby leaving a permanent mark. Laser can print various characters, symbols and patterns on the surface of pulp molding products. The laser beam acts on the surface of the pulp molded product, causing a physical and chemical reaction on the surface of the pulp molded product, evaporating the shallow fibers on the surface of the pulp molded product and leaving traces, so the logo mark is permanent and difficult to tamper with. Wear, and generally will not fade.

The advanced nature of the pattern laser manufacturing method for pulp molded products lies in the fact that the laser beam acts on the surface of pulp molded products for non-contact processing, and does not produce mechanical extrusion or mechanical stress, so it will not damage the processed items. Due to the small size of the laser after focusing, the small heat affected area and the fine processing, some processes that cannot be achieved by conventional methods can be completed. The laser processing speed is fast, the cost is low, and the computer is automatically controlled.

3. Pattern inkjet printing method for pulp molded products

The pattern inkjet printing method of pulp molded products uses the principle of charged ink particles deflected by a high-voltage electric field to print pattern characters and numbers on the surface of various pulp molded products. It is a high-tech product integrating mechatronics. .

At present, the more successful digital inkjet printers are UV inkjet printers. UV inkjet printers are also called piezoelectric inkjet printers. On the integrated nozzle, hundreds or more piezoelectric crystals are used to control the nozzle plate. Through the processing of the CPU, a series of electrical signals are output to each piezoelectric crystal through the drive board, and the piezoelectric crystal is deformed, so that the ink is ejected from the nozzle and falls on the surface of the moving object, forming a Dot matrix to form text, numbers or graphics. Then, the piezoelectric crystal returns to its original shape, and new ink enters the nozzle due to the surface tension of the ink. Because the density of ink dots per square centimeter is very high, the application of piezoelectric technology can print high-quality text, complex logos and barcodes and other information, and connect to the database for variable data printing. Adding variable data to the designated position can be printed together with the pattern. While variable data printing can realize variable data, the appearance color of the data can also be changed, and complex rainbow color printing can be realized without repeating colors. print.

By using the above-mentioned conventional methods to make signs and patterns, the surface of the molded products of pulp molded products can be colorful. Molded fiber food packaging and molded pulp industrial packaging, such as pulp molded tableware, pulp molded trays, molded fiberboards and bowls, pulp molded cup lids, etc., can be made with various patterns and logos on their surfaces.