Effective Methods to Extend the Service Life of Conical Twin-Screw Barrel Assemblies

Compared to standard screws, conical twin-screw barrel assemblies offer advantages such as a larger feeding area and a higher compression ratio. They provide superior material shearing and mixing efficiency, resulting in higher-quality plasticization. Consequently, they are ideally suited for manufacturing plastic products using high-calcium-filled PVC powder. Today, we will focus on effective methods to extend their service life, which we hope will be helpful to you.

The conical twin-screw barrel assembly is a core component of the injection molding machine; proper use and maintenance not only boost production efficiency but also prolong the assembly's lifespan. Effectively extending this lifespan hinges on proper cleaning and operational practices.

I. Use a Barrel Purging Agent
If raw materials are changed frequently during production, or if there is a significant difference in plasticization temperatures between the residual material in the barrel and the new material, a barrel purging agent can be used to improve plasticization efficiency and reduce material waste.

Specialized purging agents consist of a rubber-like material that does not melt-even at high temperatures-but instead softens into a cohesive mass within the screw flights. As the screw advances, this mass sweeps away residual material, effectively cleaning the barrel.

II. Use the Material Displacement (Purging) Method
If the plasticization temperature range of the new material is higher than that of the old material remaining in the barrel, heat the barrel and nozzle to the lower end of the new material's plasticization temperature range. Then, feed in the new material and perform continuous air shots until all residual material has been purged from the barrel.

Additionally, proper operational practices can extend the service life of the barrel and screw. When starting the injection molding machine, allow it to preheat thoroughly. Once the machine reaches the preset temperature, maintain that temperature for 15 minutes before commencing operations.

The raw materials used must be compatible with the conical twin-screw barrel assembly. Special care is required when handling corrosive or rigid materials; in such cases, a specialized screw must be used rather than a standard one.