The printing technology of flat paper has been very mature, but the pulp molded products called three-dimensional paper have ever-changing shapes and expressions. The uneven surface in order to fit the packaged object brings inconvenience to the surface printing of molded pulp products. However, adding logo and various patterns on the surface of the molded pulp products can make the three-dimensional pulp molding product appear more beautiful and distinctive.
At present, due to the complexity of the surface of pulp molded products, the common methods for making logos and patterns on the surface of molded pulp products are as follows:
Logo and various patterns are engraved on the hot-pressing setting mold, and then 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. Because it is difficult to die-cast to form clear and obvious patterns on the screen-printed side of the product, the molded paper pulp logo and pattern formed by die-casting are often on the smooth side.
Since the logo and pattern produced by die casting also require a certain pressure to form a clear pattern on the surface of the molded pulp products, the logo and pattern of the pulp molded product should not be printed on the side of the product but on the plane. The pattern is generally designed on the flat surface of the product if the pattern die-casting method of molded pulp products is used.
Pulp molding product pattern laser manufacturing method is to use laser to irradiate a certain part of pulp molding product to vaporize or color change the surface material of molded pulp products, 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 of molded pulp products is that the laser beam acts on the surface of molded pulp products for non-contact processing, and does not produce mechanical extrusion or mechanical stress, so it will not damage the processed items.
Some processes that cannot be achieved by conventional methods can be completed due to the small size of the laser after focusing, the small heat affected area and the fine processing. Moreover, the laser processing speed is fast, the cost is low, and computer automatic control can also be realized.
The pattern inkjet printing method of molded pulp 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.
By using the above-mentioned conventional methods to make signs and patterns, the surface of the molded pulp products can be colorful.
Molded fiber food packaging and molded paper pulp industrial packaging. For example, pulp molded tableware, pulp molded trays, molded fiberboard, pulp molded cup lids, etc., all above can be made with various patterns and logos on their surfaces.