Qisheng Thermoforming Machinery Co.,Ltd services

As the first stage of paper pulp molding process, collection of raw material is so important. Actually apart from a few of molded pulp products that are used for food or high-grade packaging (such as disposable tableware), most are made from recycled paper or market pulp.

As an common method in pulp molding industry, vacuum forming is achieved by vacuum filtration technology. Place dies  (also called molds) into approximate 1% concentrated pulp solution, and make sure negative pressure is generated inside the cavity with the help of vacuum. Fiber contained in pulp slurry deposits evenly on the surface of mesh of molds, and finally huge amounts of moisture content is drained off while vacuum suctioning. When required thickness of product is fulfilled, forming mold transfer from pulp and proceed with squeezing and dehydration until moisture of wet product reaches at 75%~80%, and then wet product falls off by the action of compressed air inside cavity of mold.

During all egg carton manufacturing process, 3.5~4 kg moisture content is dehydrated from every kilogram of finished product and lowered to 10%~12%. Therefore, drying process covers the major ratio in production cost and improvement of dry efficiency is the key measure to benefit.