Problem |
Caused |
Solution |
|
Low tension resistance |
Low denier |
Control the denier |
| Thickness variations |
Increase the rpm |
| Low stretching relation |
Increase the stretching relation |
| Inadequate cooling |
Check water dragging |
| |
Check the chute feeding of the extruder |
| |
Adjust the lips of the header |
| |
Improve cooling |
| |
Add loads as CaCO 3 |
|
Low ribbon elongation |
High stretching relation |
Decrease stretching relationship |
| Inadequate formulation |
Lower the temperature in the water bath or in the cooling rollers |
| Low cooling (high crystalline level) |
Decrease percentage of CaCO 3 |
| Low Denier |
low dimensions (thickness and width) |
Increase flow of the extruder |
| |
Decrease stretching relation |
| High Denier |
High dimensions (thickness and width) |
Decrease flow of the extruder |
| |
Increase stretching relation |
| Color variations |
Variations in the dosage of additives |
Use automatic dosage equipment |
| Material degradation of the |
Check grain size distribution of components |
| Polluted material |
Maintain mixture with continuous agitation |
| |
Lower melting temperature |
| |
Use pigments with higher thermal resistance |
| Thickness variations |
Feeding raw material feeding inconsistence |
Use load feeders or vibrators |
| Water crawl |
Decrease the production speed |
| inadequate adjustment of the lips of the nozzle |
Adjust the lips of the nozzle |
| Breakage of raffia during process |
Low denier |
Increase the denier |
| Excessive stretching relation |
Decrease the production speed |
| Water crawl |
Check the vacuuming system and water gliding |
| |
Lower stretching relation |
| Excessive water carry over |
High speed production |
Lower production speed |
| Inadequate formulation |
Modify formulation |
| Adherence of fine particles |
Accumulated static |
Use anti-static agents |
| Faulty reel |
Inadequate tension of the tape |
Revise the coil system |
| Excessive fibrillation |
Relación de estiramiento alta |
Lower the stretching relation |
| Inadequate formulation |
Mix with other polymers such as PEBD |
| Excessive Parison blowing |
Extremely low temperature profile in the header |
Increase the melting temperature |
| low residence time in the nozzle |
Decrease the extrusion speed |
