Plastic coloring requires precise and consistent dispersion of pigments, not just polymer melting. Compared with single screw extruders, twin screw extruders provide superior mixing, accurate pigment feeding, and stable process control. This results in uniform color, lower pigment consumption, and reliable batch-to-batch consistency, making twin screw extruders the preferred solution for high-quality plastic coloring applications.

This article introduces four essential screw-cleaning methods used in modified plastic production, especially for twin-screw extruders. It explains the working principles, operating procedures, advantages, and limitations of resin purging, mechanical disassembly cleaning, flame cleaning, and water-based hydrodynamic cleaning. By comparing their effectiveness, risks, and application scenarios, the article helps manufacturers choose the most suitable method for different materials and contamination levels. It also highlights the importance of proper operation, regular maintenance, and standardized cleaning processes to improve product quality, reduce defects, and extend extruder service life.

This article introduces the six key properties of modified flame-retardant polypropylene (PP). It explains PP’s strong mechanical performance, excellent physical characteristics, high chemical stability, and reliable heat resistance with a melting point of 164–170°C. The material also offers improved weatherability and outstanding electrical insulation. Flame-retardant PP uses phosphorus–nitrogen halogen-free systems, achieving UL94 V-0 and meeting GWIT 750°C and GWFI 960°C tests. With low smoke, low density, and minimal mold corrosion, flame-retardant PP is widely used in electrical components, automotive parts, and various extruded or molded plastic applications.

This article shares practical methods to improve and control the melt flow rate (MFR) of TPE (thermoplastic elastomers) during pelletizing and injection molding. Key strategies include adjusting the oil content in SEBS/SBS base resins, optimizing formulations by selecting higher MFI PP/PS and adjusting fillers and lubricants, and fine-tuning processing conditions such as temperature, screw shear rate, injection speed, and holding time. Together, these approaches help achieve better flowability, stable processing, and high-quality TPE products.

Nanjing Haisi Extrusion Equipment is a professional manufacturer of plastic compounding machine. We are well experienced in nylong compounding