Composite granulation screw extruder

Abstract

The invention relates to a composite granulation screw extruder. The composite granulation screw extruder is composed of a first-stage double screw extruder and a second-stage double screw extruder, the first-stage double screw extruder and the second-stage double screw extruder are arranged in a vertical manner, and the discharge port of the first-stage double screw extruder is connected with the feeding port of the second-stage double screw extruder. A material from the discharge end of the first-stage double screw extruder enters the second-stage double screw extruder from the feeding end of the second-stage double screw extruder, and is basically in plasticizing state, so decomposition caused by the long retention time of an accumulated material can be avoided. The above staged double screw extruder has good devolatilizing, mixing and conveying effects and can be adapted to present blend production high-density filling and coloring systems.

Description

technical field [0001] The invention relates to a compound granulation screw extruder, which is mainly used for mixing and extruding of filling modification, functional masterbatch and color masterbatch characterized by its blending, coloring and removal of residual low molecular matter. It belongs to the technical field of granulation equipment. Background technique [0002] At present, the processing technology of filling modification, functional masterbatch, and color masterbatch is generally: use a high-speed rotary mixer to fully mix the mediator and various additives with inorganic substances, dehydrate and activate to form a semi-dissolved mass, and then use crushing After the extruder is crushed, the granulation process is completed with a single-screw or twin-screw extruder. With the progress of society and people's emphasis on environmental protection, many modification processes are being improved to solvent-free, and modified materials have also put forward stri...

AI Technical Summary

Problems solved by technology

[0003] The currently used single-screw extruder usually compresses the material entering the feeding section according to a certain compression ratio according to the direction of screw rotation, and then mixes and disperses in the mixing section. The devolatilization effect is poor, and it needs to go through two or The dispersion and devolatilization requirements of the final performance can be completed only after three times of repeated processing

The twin-screw extruder used is an effective equipment that can complete the blending and homogenization and devolatilization process of various blending logistics systems, but the co-rotating twin-screw extrusion has a large shearing effect on the material. The period is under high temperature and high pressure, especially after the material has completed various properties, its fluid is still extruded at a very high temperature, which will have an adverse effect on certain properties of the product, and the high temperature extruded product has poor density. , easy to absorb water twice

At the same time, the self-cleaning property of the twin-screw extruder is poor, resulting in a long residence time of the material, poor dispersion and mixing, and extremely high requirements on the production process, thus limiting their respective applications in production.

Images