Pulp molding is a three – dimensional paper – making technique. It uses waste paper as raw material and forms paper products with special shapes through special molds on a mold machine.

The role of pulp molding products is: packaging products so that articles are packaged and protected, convenient and practical.

Packaging products Packaging and protection of articles is the main function of pulp molding products. The pulp molded paper support products shall be able to be packed reliably, and the packaged products shall not be damaged during transportation, handling and use, and shall have the strength, stiffness and stability requirements. The materials used in pulp molding products are also safe for packaging products and do not interact with each other.

Easy to use, that is, the structure of pulp molding products should be humanized. The structure and shape of the pulp molding products should not harm the human body, and should adapt to the operation and handling of the human body.

In addition, pulp molding products can be extended through their special structure, absorb external energy, thereby reducing the impact and vibration of packaging materials. It is different from the buffer mechanism of foam plastic packaging products, because foam products, with a large number of compressible materials due to the internal distribution of bubble hole, no matter why the product shape, has a good buffer performance, if you use the pulp plastic membrane materials and foam respectively made a big plane, the former is obviously buffer, while the latter is no buffer, so for the paper pulp, plastic film products, Good structural design is in its complete protection range, improve the damping capacity in the transport and handling process of the basic guarantee. The structural properties of the design directly affect the strength, stiffness, stability and practicability of the packaging, that is, the structure of the pulp molding products will directly affect the realization of its packaging function.

The design of pulp molding products actually includes the structure design of pulp mold itself and the design of processing mold, which are interdependent and related. It is often necessary to complete the design synchronously between the two. The general design steps and key points are as follows:

(1) Design the product structure first, and then design the mold according to the product structure. This is because the product is used to protect and fix the product, so the internal size of the product should match the external size of the product.

(2) In the mold design, the whole mold should be designed first, and then the molding mold should be designed. Because in the later stage of product reproduction, the molding process has higher requirements for size control, so it is necessary to ensure the size control in the process of shaping process, which requires the design of the molding mold size first, and then the thickness of pulp molding products needs to be fully considered. At the same time, the demoulding problem after molding should be considered, and a certain size gap should be reserved for demoulding. And the molding process will be formed after the product, especially in the thickness of the further pressure process, so the molding mold is based on the size of the integral mold design. Usually, the characteristics of the molding die and process will be taken into account in the size, such as the coating wire thickness of the molding die, the size shrinkage rate after heating.

(3) In the mold design, the lower die should be designed first, then the upper die should be designed. Usually the molding die is designed based on the size of the integral die, and the molding die is made of epoxy resin inverted die through the molding die. Moreover, the appearance size of the pulp molding paper support products matches the size of the carton, which makes it more advantageous to design the mold first.