Sealing critical points in HDPE geomembranes—pipe outlets, angled corners, repair patches, and perimeter reinforcements—with filler welding rod that restores full structural integrity, without the limitations of hot air without added material, requires a hand-held extrusion welding gun with a powerful motor and integrated air preheating. This extrusion welding machine—also called a hand extruder, extrusion welder, or extrusion welding gun—is manufactured by MOLTEXO with 3400 W of power, designed for professional geosynthetic installers, chemical tank manufacturers, structural plastic ducts, and critical repairs in civil engineering works.
Main benefits
- Independent dual heating system: hot air prepares the surface of the base material while the filler rod melts simultaneously, ensuring molecular fusion in both areas and eliminating thermal stresses that compromise joint impermeability.
- 360° rotating head with adjustable shoe: allows welding at any angle and orientation, a critical condition for tank corners, pipe outlets on the plant floor, and restricted access areas where the operator cannot maneuver freely.
- 3400 W motor for constant flow: the designed power allows continuous extrusion of filler rod without flow drops during long sessions, a condition for heavy industrial work with multi-meter seams without stopping.
- Safe cold start system: the motor does not activate until the melting chamber reaches temperature, preventing internal damage to the polymer and the motor itself, a condition that ruins generic extruders in a few months of careless use.
- Interchangeable Teflon shoes: different geometries (angle, overlap, fillet) according to the project's joint type, expanding versatility without investing in multiple tools.
Typical applications and uses
- Sealing critical details in geomembrane installation: pipe outlets, corners, perimeter reinforcements, structural interfaces.
- Manufacturing and repair of chemical tanks, water reservoirs, and structural plastic ducts made of HDPE or PP.
- Repair of cracks and damage in installed geomembranes with filler rod that restores full structural integrity.
- Construction of special elements on-site: containment ponds, sumps, sub-grade tanks, and custom non-standard elements.
Quality and durability
An economical extruder fails in two points: the motor cannot withstand continuous extrusion of several meters of rod (it burns out or loses torque within a few weeks) and the cold start system is missing or deficient (which leads to activations with unmelted material that break the motor). MOLTEXO works with a dimensioned 3400 W motor and a safe cold start, which distinguishes an extrusion gun for serious industrial work from a generic tool that fails in critical applications.
Equivalences
Equivalent to these other-brand references:
- 3400 W
- Leister FUSION 2RBK Builds Geomembrane Welding Machines – extrusion (RD family)
Brands and references mentioned belong to their respective owners; cited only for comparison and compatibility.
What filler rod should be used with this extruder?
Why is integrated air preheating necessary?
Can the bead geometry be changed for different joints?
Can it repair cracks and leaks in installed plastic tanks?
Still have questions?
Ask us and we will gladly help you with whatever you need.
| Dimensions and format | |
|---|---|
| Dimensions | 64 x 53 x 20 cm (25.2 x 20.9 x 7.9 in) |
| Welding rod diameter | 3.0 mm - 4.0 mm (0.12 in - 0.16 in) |
| Gross weight | 18 kg (39.7 lb) |
| Net weight | 6.5 kg (14.3 lb) |
| Strength and performance | |
| Structural resistances | High/low temperature, acids, and corrosion |
| Durability and protection | |
| Protection | Dust shield |
| Electrical system and motor | |
| Voltage | 220V |
| Frequency | 50/60Hz |
| Integrated controls | Temperature regulation knob and power switch |
| Extrusion motor | Metabo (Germany) 1300W |
| Heating system | Bipolar (dual system for preheating and melting) |
| Hot air blower | Weldy (Switzerland) 3400W |
| Plastic melting temperature | 200 - 300°C (392 - 572°F) |
| Air temperature | 20 - 600°C (68 - 1112°F) |
| Welding speed | 1.8 kg/h (4.0 lb/h) |
| Operation and ergonomics | |
| Material inlet | Dual feed-hole design |
| Nozzle / shoe type | Rotating 360°, made of Teflon |
| Compatibility and use | |
| Compatible materials | PP / PE |
| Machine: Width | 64.0 cm (25.2 in) |
|---|---|
| Machine: Height | 53.0 cm (20.87 in) |
| Machine: Depth | 20.0 cm (7.87 in) |
| Machine: Weight | 18.0 kg |
Official KORWINS warranty
What's covered
Confirmed defect: replacement or refund of the amount paid.
What's not covered
Payment & Security
