Plastic strip extruder

Model SJ-30 SJ-65 SJ-80 SJ-90 SJ-105 Screw Diameter (mm) 30 65 80 90 105 L/D Ratio 25:1 25:1 25/30:1 25/30:1 25/30:1 Motor Power (kW) 2.2 7.5 11–15 15–18.5 22 Machine Center Height (mm) 850 850 850 1000 1100 Screw Speed (r/min) 60 60 60 60 60 Production Rate (kg/h) 5–8 40–80 80–150 150–250 220–330 Thermoplastic elastomer materials are a type of modified plastic whose physical properties closely resemble those of conventional plastics. Therefore, during production, we typically use plastic extruders to carry out extrusion processes. However, the extrusion pressure and plasticization performance required for these materials differ somewhat from those of standard plastics. Consequently, specialized equipment must be custom-designed for their processing. Common Issues in Thermoplastic Elastomer Extrusion and Their Solutions 1. Rough Surface on Extruded Products When the surface of an extruded product appears rough rather than smooth, this is usually caused by inadequate plasticization. To address this issue, selecting an appropriate extruder is essential; additionally, setting proper process parameters such as temperature, screw speed, and filter mesh type plays a critical role. Furthermore, using higher temperatures and finer mesh filters can enhance plasticization efficiency. Some thermoplastic elastomer raw materials inherently contain high levels of hygroscopic components or fillers, making pre-drying prior to molding crucial. Failure to dry the material before extrusion may result in problems like foaming or a rough surface. 2. Unstable Extrusion Output Fluctuations in extrusion output represent an unstable condition. The primary cause often lies in variations at the feed zone or compression section of the screw, where melting points fluctuate irregularly, leading to unpredictable changes in extrusion volume and cycle times. These issues can arise due to mismatched screw geometry or unsuitable processing conditions. Thus, adjusting processing parameters and replacing the screw with one having different geometry is vital. Additionally, significant temperature fluctuations within the extruder can also destabilize material flow. Lastly, slippage between the screw and pellets at the feeding zone may further contribute to unstable extrusion.