The paper pulp molded products adopts wasted newspaper, carton box, etc, together with some chemical agents to re-shape or re-molded certain kind of product after hydration and hot press. The products can be oil-proof and water-proof, and most importantly, recycled. It’s an excellent alternation for foam made package product. Apart from that, during the production, such as egg tray machine operation, the water is recirculated within a close loop, making no pollution to the environment.
The technique of paper pulp product, such as egg tray, egg box, had been stabilized after years of innovation. Now in China, the cost to produce pulp molded products almost equals of that for foam products, some are even cheaper. Technical speaking, the pulp has advantages in shock absorption, and oil/water proof, in terms of environmental protection, pulp has much more signification.
During production, the virgin pulp, water paper, carton box, cardboard are shred and milled into fibers and float inside the water. Base on exact requirement of different product, the pulp consistency can be controlled for different production. Dye and chemicals are also added, if needed.
Majorly, there are several ways for the pulp production: Vacuum suction solution is the most common way. Based on different structure, there are rotary suction, flip suction and reciprocating suction.
Rotary suction solution has higher efficiency as the production is continuous with higher accuracy. For such production, the initial investment is higher, such as mold, which requires higher accuracy, costs higher and needs larger quantity. It’s suitable for large quantity production of standard sized products, such as egg tray, tableware, bottle tray, etc.
Flip suction solution is lower in speed, normally, it’s adopted for special production for non-standard products. However, since the mold is specially designed, the mold cost is also not cheap.
Reciprocating suction is similar in speed as that from flip one. Since there is only one mold (male part and female part), the cost is much more cheaper and it’s very common in small business that only needs lower capacity.