Semi-dry pressing (high-quality dry pressing) is an area that needs to be focused on in the recent upgrading of pulp molding process and equipment

The semi-dry pressing process is an important process classification in the field of pulp molding. It combines the characteristics of dry pressing and wet pressing process, when dry pressing, if the product needs to be shaped, the moisture content of the product at this time is generally close to the natural moisture content of the pulp, usually between 6% and 18%, and the wet pressing of the product is heated and shaped in the mold, and the wet embryo moisture content of the product is generally between 60% and 78%. Semi-dry pressing, when the product is shaped (shaping), the moisture content of the wet embryo of the product is generally controlled between 25% and 40%, and there is also a technical point of semi-dry pressing, which is to ensure that the humidity inside the product is small and the humidity outside is large when the product is shaped (shaping), so that the machine can ensure efficiency and obtain the desired surface quality. The advantage of semi-dry pressing (fine dry pressing) process is that it can not only maintain a certain hardness and stability, but also maintain a certain softness and plasticity, suitable for some product performance requirements between hard wet pressing and soft dry pressing applications, at present, semi-dry pressing (fine dry pressing) is mainly in the field of fine wet pressing in the field of work package competition, it is expected that in the future, with the progress of equipment and technology, will be applied in specific products in various existing fields such as fine wet pressing (tableware), fine wet pressing (work package), dry pressing, etc. In recent years, with the continuous development of pulp molding production technology and technology, industry insiders have further subdivided the pulp molding production process. Dry pressing is a traditional production process that separates pulp molding from drying, shaping, and trimming. The main difference between wet pressing and dry pressing is the difference in the moisture content of wet embryo when the product is finalized (shaping), and wet pressing is suitable for the production of food tableware and high-quality industrial packaging products with high precision requirements. The semi-dry pressing process is through drying, drying, drying and other processes, the moisture content is kept at about 20-40%, and then the mold is dried or shaped to obtain a fine paper mold product between the wet pressing process and the dry pressing process, its energy consumption is much lower than the wet pressing process, the efficiency is much higher than the wet pressing process, and the surface quality of the product is far better than that of dry pressing.