This article explains the key process and equipment requirements for producing PVA modified compound pellets used in biodegradable film applications. Due to its thermal sensitivity and strong hydrogen bonding, PVA must be compounded with plasticizers and additives before extrusion processing. The twin screw extruder plays a critical role by ensuring proper mixing, plasticization, and dispersion. Key factors include precise temperature control, efficient vacuum venting, high L/D screw configuration, and a stable liquid injection system for adding plasticizers. The article also outlines the typical compounding workflow, common production issues such as fisheyes and moisture, and practical solutions. Overall, selecting the right equipment and optimizing process parameters are essential to achieving high-quality, stable PVA pellets for film production.

This article discusses how different TPE pelletizing methods, such as cold cutting and hot cutting, influence product quality. It highlights key extrusion parameters including melt temperature, pressure, and conveying speed, which directly affect pellet consistency and final product performance. Common pellet quality issues—such as black spots, discoloration, poor plasticization, or excess moisture—are analyzed with corresponding solutions to ensure stable extrusion, improved material properties, and higher product reliability.

This article explores common causes of die hole blockage in underwater pelletizing systems—especially when processing engineering polymers like PET, nylon, and polycarbonate—and outlines three key strategies to reduce cleaning frequency: automating the startup sequence to avoid premature cooling or smearing, optimizing die heating and insulation to prevent uneven temperature distribution, and maintaining stable extrusion conditions using melt pumps and continuous screen changers. These solutions help ensure consistent pellet quality, reduce downtime, and improve overall production efficiency.

The article discusses essential equipment for TPE pellet production, including extruders, pelletizers, and auxiliary systems. Equipment choice depends on production scale, with larger setups requiring more advanced automation. Contract manufacturing is an alternative for companies with limited capacity.

Compared with strand pelletizing, underwater pelletizing has the advantages of better pellet quality, higher degree of automation and lower cost. However, compared with less sensitive commodity resins such as polyethylene, polypropylene or polystyrene, the risk of mold freezing is greater when producing engineering resins such as those mentioned in the previous paragraph.

But how to choose a suitable plastic pelletizing machine? In this article, we will walk you through the process of choosing a suitable plastic pelletizing machine, providing expert advice and practical tips.

Before processing and granulating, a complete set of granulation equipment is required, which is the TPE/TPR granulation production line. The basic components include mixing equipment, plasticizing equipment, cooling equipment, granulating equipment, and batch mixing equipment. Common TPE/TPR pelletizing production lines include "strand pelletizing", "underwater pelletizing" and "water ring pelletizing".

The twin screw extruder has a wide range of applications, and can process and produce a variety of products. We need to choose different auxiliary machines to adapt or improve the material characteristics, and make products perfect.

Based on the two processes of strand pelletizing and underwater pelletizing, we try to analyze seven common granulation problems and the corresponding solutions, and provide some suggestions for continuous mass production of quality products.