Plastic hollow sheet (also called hollow partition board, universal board, double wall board, corrugated board) adopts modern chemical HDPE and HDPP materials. It is a new material with light weight (hollow structure), non-toxic, no pollution, waterproof, shockproof, anti-aging, corrosion resistance and rich color. Compared with cardboard structure products, Hollow board has moisture-proof, corrosion resistance, more portable and other advantages to replace cardboard. Compared with injection products, hollow board has the advantages of shockproof, flexible structure design, and no need to open injection mold. At the same time, the plate can be flexibly added through the control of raw materials, such as anti-static, conductive master material, etc., to produce a conductive, anti-static function of plastic hollow plate, anti-static plate surface resistivity can be controlled between 103 ~ 1011.
Corrugated plastic hollow sheet is an extruded hollow profile, also called twin wall plastic sheet, coroplast, corflute, cartonplast, PP hollow profile, available in both Polypropylene(PP) and Polyethylene(PE), used in sign printing, packaging, protection and a multitude of other applications.
The raw material for plastic hollow sheet is added into the barrel of injection molding machine by hopper according to the amount of plastic products used for one time, and the rotating screw pushes the raw material forward. At the same time, the raw material is heated outside the receiver barrel. Due to the raw material in the barrel both to heat up, but also because of the screw screw volume gradually reduced and compressed, coupled with a variety of conditions such as rotating screw thread to turn forward material and friction between the material and the barrel, so that the raw material is pushed forward while gradually being molded into molten state. To screw the front end of the molten material, due to the resistance of the nozzle and the screw thread push pressure, with the increment of the screw pushing forward melting, is produced by the reverse thrust pressure melting also gradually increases, when the reverse thrust pressure is greater than the oil cylinder piston thrust and frictional resistance of the screw (the resistance is the back pressure of screw), The screw begins to retreat, and the hopper feeding metering begins at the same time. The backward distance of the screw is determined by the amount of injection material of a molding product and controlled by the travel limit switch adjusted before production. After the backward screw touches the travel switch, it stops rotating and retreating to complete a pre-plasticizing raw material procedure.
The solid molding of the product is completed after the pressure retaining and cooling shaping reaches the preset time. The injection seat is pulled back by the piston of the oil cylinder to start the second pre-plasticizing of the screw. The molding mold is opened and the products are pushed out of the mold cavity to complete the whole process of injection of the plastic hollow plate.