Parallel twin screw barrel for PVC pipe and profile
1.Hardness after hardening and tempering: HB280-320.
2.Nitrided Hardness: HV920-1000.
3.Nitrided case depth: 0.50-0.80mm.
4.Nitrided brittleness: less than grade 2.
5.Surface roughness: Ra 0.4.
6.Screw straightness: 0.015 mm.
7.Surface chromium-plating's hardness after nitriding: ≥900HV.
8.Chromium-plating depth: 0.025~0.10 mm.
9.Alloy Hardness: HRC50-65.
10.Alloy depth: 0.8~2.0 mm.
Flat twin screw barrels play an important role in the production of PVC pipes and profiles. Its applications in these two fields are listed below: Plasticization and mixing of materials: The screw barrel fully melts and mixes PVC resin and other additives through the rotating screw and heating area. This makes the PVC material soft and easy to process and shape. Extrusion molding: Under the action of the screw barrel, the molten PVC material is extruded through the die to form a tubular or profile-shaped product.
The design and adjustment of the screw barrel enables the production of pipes and profiles of different shapes and sizes. Cooling and solidification: After extrusion, the pipe or profile undergoes rapid cooling through a cooling system to solidify the material and maintain its shape. Cutting and Trimming: Use equipment such as cutting machines and trimming machines to adjust the size and complete the process of extruded pipes and profiles. In short, the flat twin-screw barrel plays a key role in the production process of PVC pipes and profiles, realizing the plasticization, mixing, extrusion molding and subsequent processing of materials, ensuring the quality and performance of the final product.
