Pulp molding is 3D papermaking technology, which uses pulp as raw material, and a mold with a filter screen under pressure (negative pressure or positive pressure) to dehydrate the pulp and form fibers to produce the desired products. The pulp molding process mainly includes pulping , adsorption molding, drying, and shaping. Die forming has vacuum forming method and extrusion forming method. At present, the vacuum forming method is widely used in my country’s pulp molding industry.
1.Process: Raw material (waste paper) → beating → pulp mixing & storage & pulp supply → forming machine → drying → packing and storage
2.Raw materials and fuels: Raw materials: waste book paper, waste newspaper, waste paper box, waste white edge paper, and paper tailing pulp. Drying fuel: coal, wood, diesel, natural gas, liquefied petroleum gas, etc.
3.Mold: Mold materials include plastic molds and aluminum abrasives. The mold is divided into two types: forming mold and transfer mold.
4.Mixing: Under normal circumstances, the pulp concentration after pulping is about 5%, while the pulp concentration required for paper and plastic production is generally required to be about 1% (adjusted according to the characteristics of the produced products). Add waterproof glue, pigment, sand, and other additives due to product characteristics. The process of adjusting the pulp concentration and adding auxiliaries according to the product characteristics is called pulping.
The moisture content of the wet egg tray after molding is about 71%.