Delamination or Peeling:
This defect occurs when foreign materials are mixed into the raw material, the mold temperature is too low, or the material compatibility is poor. Excessive shear stress during melt flow along the mold surface causes the material to separate into thin layers, resulting in peeling or delamination.
| 5.1 Causes | 5.2 Solutions |
|---|---|
| 5.1.1 Material not properly dried. | 5.2.1 Dry the material thoroughly. |
| 5.1.2 Mixing of different types of plastics. | 5.2.2 Use qualified and uniform raw materials. |
| 5.1.3 Mixing materials of different grades of the same plastic. | 5.2.3 Use materials of the same grade. |
| 5.1.4 Uneven plasticization. | 5.2.4 Adjust processing parameters to ensure uniform plasticization. |
| 5.1.5 Contamination with foreign substances. | 5.2.5 Use clean and qualified materials; label and manage remaining materials properly. |
| 5.1.6 Low melt temperature or low mold temperature; screw speed too high. | 5.2.6 Increase melt and mold temperatures, reduce shear stress during flow, and lower screw speed. |
| 5.1.7 Small cold slug well, poor flowability, and rapid cooling. | 5.2.7 Enlarge the cold slug well, increase melt flow speed, and slow down the cooling rate. |
| 5.1.8 Improper ratio of new to recycled material. | 5.2.8 Mix materials according to specified requirements. |
| 5.1.9 Severe silver streak phenomenon. | 5.2.9 Dry the material to meet the required moisture content. |
| 5.1.10 Low holding pressure and low back pressure. | 5.2.10 Increase holding pressure and back pressure. |
follow us :
-- get updates with latest topics
e-mail
English
français
Deutsch
русский
italiano
español
português
العربية
日本語
한국의
中文