This article outlines the differences in processes and production efficiency among various models of twin-screw extruders, classified by screw rotation direction, screw structure, intermeshing degree, purpose, and specification. It discusses the specific applications, characteristics, and production efficiencies of co-rotating and counter-rotating models, parallel and conical designs, and general-purpose versus specialized extruders. The article also highlights the factors affecting production efficiency, such as screw design, rotation speed, material properties, and process parameters, providing a comprehensive guide for selecting the right twin-screw extruder based on material, process, and production scale.

Shear heat release occurs in extrusion as the screw's shearing action generates heat, affecting material temperature. Proper control through screw design, speed regulation, and cooling ensures process efficiency and product quality. It can also be leveraged to enhance material properties in specific applications.

This article discusses how to optimize a single-screw extruder for melt feeding when it follows a twin-screw extruder in a compounding production line. It focuses on the importance of the metering channel depth in the single-screw extruder, as this affects the specific throughput rate and discharge temperature. A deeper metering channel reduces the specific throughput rate and increases the discharge temperature, which can degrade sensitive additives like flame retardants. The article presents a case study of a 15-inch diameter screw with an initial metering channel depth of 1.73 inches, which leads to inefficiencies. It then proposes an optimized screw design with a shallower channel depth of 1.18 inches, improving throughput and reducing discharge temperature. The optimized screw requires additional torque, and its design factors include screw lead length and metering channel depth as a percentage of screw diameter.

Advances in twin screw extruders offer opportunities for processing that is shear sensitive or limited by torque and/or temperature. Regardless of the formulation and/or end product, it is important for processors to understand and employ the latest technology to achieve success.

As the manufacturing and processing technology of twin-screw extruders becomes better and better, it not only has to perform tasks such as feeding and plasticizing, but also has some requirements such as dehydration and drying. In order to better meet the different needs of users, the twin-screw extruder must continuously improve its working efficiency, and also find ways to improve the quality of the products produced.

List of PS modified formulas 1. PS blending 2. Flame retardant reinforced toughened PS/PBT blended alloy material 3. PS flame retardant 4. Halogen-free flame retardant modified HIPS 5. PS foaming 6. Low foaming HIPS plastic paper

Perhaps many people have discovered that most of the extruders used in large-scale product production lines are single-screw structures, and very few are twin-screw structures. Upstream raw material suppliers, especially manufacturers of modified materials, functional masterbatches or color masterbatches, mostly use twin-screw extruders. Why is there such a difference? In this article, the editor will analyze and discuss the difference between single-screw extruders and twin-screw extruders.

The structure of a twin-screw extruder is very similar to that of a single-screw extruder, but its working principle is very different. In a single-screw extruder, material transportation relies on the friction and viscous resistance of the material, so the residence time distribution is wider. In contrast, the material conveying of the twin-screw extruder relies on the positive displacement of the screw, so the residence time distribution is narrower. The raw materials of the twin-screw extruder are fed through the feed port by a metering feeder. Some additives (such as glass fiber) need to be added through the feed port in the middle of the barrel and transported to the die head by the screw. During this process, the movement of the material varies depending on the screw meshing method and the direction of rotation. This article will introduce the specific differences in their working principles from this perspective.

Since its introduction, twin-screw extruders have been widely used in the field of plastic modification and are the core equipment in the field of modification. Every modification factory takes good care of the twin-screw extruder, but in daily work, it is inevitable to encounter equipment loss and repair. So in order to avoid or reduce loss, how to repair it after a failure, the editor will introduce to you some tips on extruder maintenance and repair.

The most notable feature of the co-rotating twin-screw extruder is that both the screw and barrel adopt a "building block" design. By combining various threaded elements, the co-rotating twin-screw extruder has the functions of feeding, melting, mixing, exhausting, pressure holding and conveying, realizing various process such as material conveying, plasticizing, shearing, exhausting, pressure holding and extrusion.