Stretching orientation is the core process for imparting high strength to PP strapping. The pressure extension unit and extension box of this production line provide a wide draw ratio adjustment range from 1.5 to 12 times.

By precisely controlling the speed ratio between the extension rollers and haul-off rollers, PP molecular chains are highly oriented along the stretching direction, increasing the longitudinal tensile strength of the product several times over its unoriented state.

Users can flexibly select the optimal draw ratio according to the final application (light bundling, heavy-duty packaging), achieving flexible production from standard to ultra-high strength strapping to meet diverse customer requirements.

• Draw Ratio Range: 1.5 - 12 : 1 (continuously adjustable)
• Extension Box Length: 4m + 2.5m (total 6.5m)
• Extension Roller Diameter: φ200mm, surface hardness HRC60
• Pressure Extension Roller: φ156mm, face width 500mm
• Pressure Extension Motor: 7.5KW
• Extension Box Heating Power: 41.6KW
• Mold Temperature Controller Power: 6KW
• Temperature Range: 50-250℃
• Insulation Thickness: 100mm