Design of pulp molded products
The design of pulp molded products actually includes the structural design of the pulp mold itself and the design of the processing mold, and the two are interdependent and related. Often the two need to be designed synchronously. There are three general design steps and points:
First Design pulp molded products structure
First design the product structure, and then design the mold according to the product structure. This is because the product is used to protect and fix the product, so its internal size should match the overall size of the product.
Secondly, the mold design should first design the integral mold, and then design the forming mold. Because the product is in the later stage of production, the shaping process has higher requirements for size control, so the size control in the shaping process must be ensured first, which requires the size of the shaping mold to be designed first. At this time, the pulp molded product needs to be fully considered. thickness. At the same time, it is also necessary to consider the demoulding problem after shaping, and it is necessary to reserve a certain size gap for demoulding. Moreover, the shaping process will further pressurize the formed product, especially in terms of thickness, so the forming mold is redesigned on the basis of the size of the shaping mold. Usually, the size will take into account the characteristics of the forming mold and the process, such as the thickness of the covering wire of the forming mold, the dimensional shrinkage rate after shaping and heating, etc.
Finally, in the mold design, the lower mold should be designed first, and then the upper mold should be designed. Usually the forming lower mold is designed based on the size of the integral upper mold, and the forming upper mold is made by epoxy resin inversion molding through the forming lower mold. Moreover, there is a problem of matching the appearance size of the pulp molded product with the inner size of the carton, which makes it more beneficial to design the lower mold first.