Causes of Poor Plasticization in Plastic Extruders
Time：
2018-11-14
When using a plastic extruder for plastic processing, the occurrence of poor plasticization can be quite troublesome. So what causes this phenomenon, and how should we address it? I. The manifestations of poor plasticization in a plastic extruder include: 1. A “toad‑skin” appearance on the surface of the plastic layer; 2. Low temperature control—indicated by a low reading on the thermometer and confirmed by actual measurements; 3. Darkening of the plastic surface, accompanied by fine cracks or small particles that have not been properly plasticized; 4. Poor sealing at the weld lines, leaving a distinct visible mark. II. Causes of poor plasticization in a plastic extruder: 1. Temperature…
When using a plastic extruder for plastic processing, poor plasticization is a particularly troublesome issue during production. So what causes this phenomenon, and how should we address it?
I. When a plastic extruder experiences poor plasticization, the manifestations include:
1. The surface of the plastic layer exhibits a toad-skin-like texture;
2. The temperature control is set too low; the instrument pointer indicates a low temperature, and the actual measured temperature is also low.
3. The plastic surface has turned black and exhibits tiny cracks or small particles that have not been properly plasticized;
4. The plastic joint was poorly glued, leaving a noticeable seam.
II. Causes of Poor Plasticization in Plastic Extruders
1. The temperature control is too low or improperly set;
2. The plastic contains resin particles that are difficult to mold;
3. Improper operating procedures—such as excessive screw and traction speeds—result in incomplete plasticization.
4. During pelletizing, the plastic may be unevenly blended, or the plastic itself may have quality issues.
III. Shuangda Machinery teaches you how to troubleshoot poor plasticization.
1. Maintain the temperature in accordance with process specifications; if the temperature is too low, adjust it upward as needed.
2. Appropriately reduce the screw and traction speeds to extend the plastic’s heating and plasticizing time, thereby enhancing the plasticization effect.
3. Utilize the screw cooling water to enhance plastic plasticization and density;
4. When selecting a mold, choose one with a slightly smaller die sleeve to increase the pressure at the glue outlet.
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