Comparison of extrusion and injection molding process of plastic hollow board
Comparison of plastic hollow board extrusion and injection molding process
1. Plastic hollow board extrusion molding
Extrusion molding is used in plastic processing. It is called extrusion, and it is extruded by hydraulic pressure on the die itself in the processing of non-rubber extruders. It refers to a processing method in which the material passes through the extruder barrel and the screw, while being plasticized by heat, is pushed forward by the screw, and continuously passes through the die to make various cross-sectional products or semi-products. In plastic processing, it is also called extrusion. In the processing of non-rubber extruders, it is extruded by hydraulic pressure on the mold itself. It refers to a processing method in which materials pass through the action between the barrel and screw of the extruder, while being heated and plasticized, and pushed forward by the screw, and continuously pass through the die to make various cross-section products or semi-products
The injection molding machine uses the property of plastic to melt into a liquid after being heated to a certain temperature, and the molten liquid is injected into a closed mold cavity under high pressure. Cool and shape, and eject the desired plastic product after opening the mold
2, principle and process
Principle of plastic hollow plate extrusion: the material enters the barrel from the hopper, and is transported forward to the feeding section (glass state) through the friction and shear action of the inner wall of the barrel and the surface of the screw under the action of the screw rotation, where it is loose The solid is conveyed forward and compacted at the same time; in the compression section (high elasticity), the depth of the screw groove becomes shallower, and further compaction, while heating outside the barrel and frictional shear between the screw and the inner wall of the barrel, the material temperature rises and begins to melt , The compression section ends; the homogenization sectionu003dmetering section (viscous flow state) makes the material uniform, extrudes the melt at a constant temperature, quantitative, and constant pressure, and forms after reaching the machine head, and the product is obtained after finalization.
Injection molding: The plastic injection molding machine uses the thrust of the screw (or plunger) to plasticize the molten state (that is, viscous flow). The process of injecting the plastic into the closed mold cavity, and obtaining the product after solidification and shaping. Injection molding is a cyclic process, each cycle mainly includes: quantitative feeding-melting and plasticizing-pressure injection-filling and cooling-mold opening and taking parts. After taking out the plastic part, the mold is closed again for the next cycle.
Guangzhou Qusheng Plastic Products Co., Ltd. is mainly engaged in a series of products such as hollow board, hollow board knife card, hollow board turnover box and so on. The thickness can be 2-12mm, the hole width of the hollow plate can reach 2400mm, and the length is not limited. Welcome to call 137 6420 8183, or visit the website www.cnpalletbox.com. We are looking forward to your visit!