Conical Twin Screw Extruder

Model SJZ series twin conical screws extruder is a kind of special equipment for extruding of PVC powder. With different sorts of molds and auxiliary machines, it can produce all sorts of PVC plastic pipe material, profiled material, plate material, sliced material, bar material and granulation.

The screw has applied oil cooling system. Barrel is cooled by special wind cooling system. The system has applied special computer control. According to customer's requirements, most reasonable screw can be made so as to achieve best plasticity state and material quality. The screw is made by high precision special digital screw miller, extruding property can be highly harmonized. It has firstly introduced advanced technique of producing screws with variable pitch and depth, so that the material can be more softly sheared and cut. The distribution box is specially designed, pull force bearing is fully imported, the drive life span can be prolonged. It can bear larger extruding pressure. The electrical system has mainly applied imported parts, it has multiple alarm system, there are few problems which can be easily eliminated. The cooling system has applied special design, heat emission area is enlarged, the cooling is rapid, temperature control tolerance can be ±1℃.

Why does a twin scratch extractor mix better than a single scratch extractor?

Strong shearing force and extrusion force: the twin-screw extruder has two screws rotating synchronously, and the high efficient shearing force and extrusion force formed between them help to mix the raw materials better. The synergistic effect of the twin-screw can mix the raw materials of different components more fully in the extrusion process.

Larger surface area: the twin-screw extruder has a larger surface area than the single-screw extruder because the space between the twin-screw allows more feed to pass through. This means that more raw materials can come into contact with the barrel wall, increasing the mixing opportunity and helping to improve the mixing uniformity.

Adjustable pitch and screw speed: twin-screw extruder usually has adjustable pitch and screw speed, and operators can adjust these parameters according to production needs. By flexible adjustment of screw pitch and screw speed, it can better adapt to different materials and production requirements and achieve more accurate mixing effect.

Parallel screw motion: the screw of twin-screw extruder is usually in parallel motion, which helps to reduce the shear heat generated in the extrusion process, so as to better maintain the temperature stability of raw materials. Stable temperature helps prevent uneven melting of raw materials in the mixing process and improves the mixing consistency.