Pattern making method for pulp molded products

The printing technology of flat paper has become very mature, but as a pulp molded product known as three-dimensional paper, the three-dimensional pulp molded product has a variety of shapes and forms. The uneven surface that appears to match the packaging material brings inconvenience to the surface printing of pulp molded products. But adding logos and various patterns on the surface of pulp molded products can make three-dimensional pulp molded products appear more beautiful and distinctive.

Due to the complexity of the surface of pulp molded products, there are currently several common methods for making logos and patterns on the surface of pulp molded products:

1. Die casting method for producing surface patterns of pulp molded products

Logos and various patterns are engraved on the hot pressing and shaping mold. During the production process of pulp molded products, wet blanks are transferred to the hot pressing and shaping mold for hot pressing and shaping. After drying, the surface of the product naturally has corresponding logos or various patterns.

The logo and pattern produced by the molding and die casting method are relatively simple, with convex and concave shapes on the surface of the product. The side with screen printing on the product is difficult to die cast to form clear and distinct patterns, so pulp molded logos and patterns formed by die casting method often appear on the surface of the product, and the logo and pattern on the product surface are often smooth. Due to the fact that the logo and pattern generated by the die casting method also require a certain amount of pressure to form a clear pattern on the surface of pulp molded products, the logo and pattern of pulp molded products should not be printed on the side of the product but on a flat surface. So, when using the pulp molded product pattern die-casting method, the pattern is generally designed on the flat surface of the product.

2. Method of using laser to produce trademarks and patterns on the surface of pulp molded products

The laser pattern making method for pulp molded products is a pattern making method that uses laser to irradiate a certain part of the pulp molded product, causing the surface material of the pulp molded product to vaporize or undergo color changes, thereby leaving a permanent mark. Laser can create various characters, symbols, and patterns on the surface of pulp molded products. By applying a laser beam to the surface of pulp molded products, a physical and chemical reaction occurs on the surface, which evaporates the shallow fibers on the surface of the pulp molded products and leaves a mark. Therefore, this logo mark is permanent, difficult to tamper with and erase, and generally does not fade.

The progressiveness of the laser production method for the pattern of molded pulp products is that the laser beam acting on the surface of molded pulp products is non-contact processing, which 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. Laser processing is fast, cost-effective, and computer-controlled.

3. Pattern inkjet printing method for pulp molded products

The pattern inkjet printing method for pulp molded products uses charged ink particles and the principle of high-voltage electric field deflection to spray pattern text and numbers on the surface of various pulp molded products. It is a high-tech product that integrates mechanical and electrical integration.

At present, the most successful digital inkjet printer is the UV inkjet printer, also known as the piezoelectric inkjet printer. The integrated nozzle is controlled by hundreds or more piezoelectric crystals to control multiple spray holes on the nozzle plate. Through the processing of the CPU, a series of electrical signals are output to each piezoelectric crystal through the driving board. The piezoelectric crystals deform, and ink is sprayed out of the nozzle and falls on the surface of the moving object, forming a dot matrix, thereby forming text, numbers, or graphics. Then, the piezoelectric crystal returns to its original state, and due to the surface tension of the ink, new ink enters the nozzle. Due to the high density of ink dots per square centimeter, piezoelectric technology can be applied to print high-quality text, complex logos, barcodes, and other information, and connect databases for variable data printing. By adding variable data at the designated location, it can be printed together with the pattern. Variable data spraying not only achieves data variability, but also allows for changes in the appearance color of the data, enabling complex rainbow color printing and non repetitive color printing.

Using the conventional methods mentioned above to create logos and patterns can make the surface of pulp molded products rich and colorful. Molded fiber food packaging and molded pulp industrial packaging, such as pulp molded tableware, pulp molded pallets, molded fiberboards and bowls, pulp molded cup lids, etc., can all have various patterns and logos made on their surfaces.