Low & High Speed Haul-Off Units for Precise Tension – PP Strap Extrusion Line

Tension control is a critical factor affecting product thickness uniformity, stretching orientation effectiveness, and final winding quality in PP strapping production. This production line features a multi-stage haul-off system consisting of a low-speed three-roller haul-off unit (0-40 m/min, 5.5KW) and a high-speed five-roller haul-off unit (0-250 m/min, 15KW), as well as multiple high-speed three-roller units (0-250 m/min, 5.5KW), forming a stepped speed and tension control network. The low-speed unit stabilizes the nascent tape after extrusion, while the high-speed units provide precise tension adjustment after stretching and setting. Multi-stage haul-off combined with closed-loop speed control ensures constant, fluctuation-free tension across all sections, providing a solid foundation for high-precision, high-speed production.

• Low-speed unit: Gentle traction of nascent tape prevents stretching deformation
• High-speed units: Precise tension control after stretching and setting
• Speed accuracy: ±1 m/min, full-line closed-loop synchronization
• Chrome-plated rollers: HRC58-60 hardness, wear-resistant and non-damaging
• Stable tension: Multi-stage traction eliminates cumulative tension fluctuations
• Fast response: Inverter/servo drives for instant tension adjustment
• Reduced scrap: Stable tension ensures uniform thickness, reducing dimensional rejections
• High-speed compatible: High-speed units support 250 m/min line speed
• Coordinated control: PLC unified coordination for easy operation
• Quality enhancement: Constant tension ensures consistent product performance