Self-locking pulling clamp

Positioning, tensioning and dragging heavy HDPE geomembrane sheets during installation —without your hand slipping off the edge of the liner or damaging the material with makeshift fixes— calls for a mechanical grip that bites the liner firmly and won't let go under load. This pulling clamp —also called a puller, grip or jaw for geomembrane— is a KORWINS tool with a self-locking structure and knurled pressure rollers that firmly hold sheets up to 10 mm thick, with a self-locking mechanism designed for a highly reliable grip while the material is pulled.

Key benefits

• Self-locking grip: the harder you pull, the more it bites; the self-locking mechanism keeps the liner from slipping out under load.
• Knurled pressure rollers: the knurling spreads the pressure and grips firmly without piercing or tearing the edge of the membrane.
• Compatible up to 10 mm thick: works for thin and heavy-gauge geomembranes, as well as geotextiles and composite sheets within range.
• Precise tensioning and alignment: lets you pull sheets to align the overlaps before welding, improving joint quality.
• More safety and less fatigue: replaces the hand grip —slippery and injury-prone— with a firm, repeatable mechanical hold.

Applications and typical uses

• Dragging and positioning HDPE/LLDPE geomembrane sheets in ponds, reservoirs and landfills.
• Tensioning and aligning overlaps before wedge or extrusion welding.
• Handling geotextile and geocomposites during deployment.
• Support on slopes to hold and reposition the liner without it sliding.

Quality and durability

A cheap puller fails when the knurling wears down and starts slipping, when the locking mechanism gives way under tension, or when a poorly designed jaw leaves the liner marked or perforated. This clamp is fitted with knurled pressure rollers and a calibrated self-locking system to hold firmly without damaging the material, conditions for repeated jobsite use with safety for the crew and for the integrity of the membrane.