Device for filtering impurities in the extruding process of PVC resin

Abstract

The invention discloses a device for filtering in the extruding process of PVC resin. The device is arranged between a connection body of an extruding machine and a die head and has compact structure,small volume and convenient installation and disassembly; the internal diameters of a molten material passage of the device and the connection body of the extruding machine are the same, the molten material passage is a straight flow passage without an internal cavity, and a net exchange piston which is controlled by a hydraulic device and can move up and down is cylindrical; and two passages arearranged on the piston, wherein one passage is provided with a porous plate, and the other passage is a straight flow passage. The invention does not have the hiding dead angle of the PVC molten material, reduces the accumulation of impurities and scorched materials, removes a little small particles which exist in the molten material and are difficult to plasticize, avoids the phenomena of blackspots, fish eyes and the like existing at the surface of a product, and enhances the performance of the product, especially the performance of the products, such as PVC threading tubes and the like, which need to be processed by cold bending.

Description

technical field [0001] The invention belongs to the field of plastic extrusion molding processing, and in particular relates to an impurity filtering device for PVC resin extrusion processing. Background technique [0002] In the field of plastic molding processing, PVC is relatively difficult to process. It needs to add stabilizers, processing aids, lubricants, anti-impact agents and other additives to produce a mixture through a high-temperature mixer before it can be sent to the extruder for processing. In addition, each In order to reduce production costs, manufacturers will add a large amount of fillers and recycled materials to the mixture, so there must be a small amount of small particles that are difficult to plasticize in the mixture, and these small particles will eventually hide in the formed product, and the surface of the product will Impurities such as black spots and fish eyes appear, which seriously affect the appearance and performance of the product. Espec...

AI Technical Summary

Problems solved by technology

As attached to the manual figure 1 As shown, a perforated plate 3 is placed between the extruder connecting body 1 and the die head 2, but as the use time increases, the perforated plate 3 will block and accumulate miscellaneous materials, and the accumulated miscellaneous materials need to be cleaned frequently, resulting in more waste

Images