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Welding of plastic geomembranes for sealing tunnels
Versatile and reliable

TWINNY T

Tunnel geomembranes are utilized in surface mining or deep mining. Once the concrete casing is complete, a plastic sealing system made from HD-PE, PP, PVC or TPO is usually used to provide protection from any penetrating moisture. The individual sheets are laid perpendicular to the direction of the tunnel. Lightweight and flexible welding machines are required for this "overhead welding". Leister offers several suitable machines in the form of the TWINNY, COMET, and UNIDRIVE 500. Details can be welded easily and ergonomically with the hand extruders, hand welding tools, and matching accessories.

Overlap welding of geomembranes in tunnel construction
Welding seam quality which can be inspected
Overhead welding
Welding of details

Leister has the solution
Leister offers various hot-wedge and combi-wedge machines for welding HD-PE, PP, PVC or TPO materials. Welding seam tensiometers improve safety. A broad spectrum of different hand extruders and hand welding tools completes the range.

Efficient welding with machines for lap welding, plus "overhead welding"
Welds with test channel
Hand extruders for the extrusion welding of connections and details
Tensiometers for checking the tensile load and integrity
Recording of data with a USB memory system
Wide range of hand welding tools and accessories

Hot-air hand tools

TRIAC AT

The TRIAC AT is an intelligent hot-air hand tool for welding and shrinking plastics that is suitable for on-site use.

TRIAC ST

Handiness, reliability and versatility are the key arguments in favor of the TRIAC ST.

Extrusion Welders

FUSION 2

The FUSION 2 convinces with its ergonomic design. The simple operation and first-class welding quality have helped it to become the break...

FUSION 3

With its long and narrow shape, the FUSION 3 enables comfortable work, even on the floor.

WELDPLAST S2

The WELDPLAST S2 is a compact, ergonomically designed workhorse. The handy size extruder puts out two kilograms per hour without difficulty.

WELDPLAST S2 PVC

The WELSDPLAST S2 PVC has integrated corrosion protection and has been especially designed to satisfy the high requirements of PVC extrus...

WELDPLAST S2 TPO

The WELDPLAST S2 TPO is a compact, ergonomically designed workhorse. The handy size extruder puts out two kilograms per hour an can even ...

Hot-wedge Welders

COMET

The small powerhouse COMET is specially designed for the demands of landfills sites, mines and tunnels.

COMET USB

COMET USB's memory system is designed for use on construction sites. Because this compact hot-wedge welding machine records all relevant ...

Combi-wedge Welders

TWINNY S

This lightweight tool TWINNY S is optimized for overhead welding and is ideal for thin materials used in civil engineering and tunnel con...

TWINNY T

The TWINNY T is excellent for welding PVC and other thin or soft membranes.

TWINNY T USB

TWINNY T USB makes data storage and is excellent for welding PVC and other thin or soft membranes

Semiautomatic hot-air tools

UNIDRIVE 500

The UNIDRIVE 500 combines manual and automatic welding in a 4.5 kg lightweight and easy-to-handle automatic welder. Thanks to its overlap technology, it is ideal for welding all thermoplastic single ply membranes such as PVC and TPO.

Testing instruments

Test needle (tapered)

Air pressure test manometer used in civil engineering for proving the tightness of double welding seams.

Test needle

Air pressure test manometer used in civil engineering for proving the tightness of double welding seams.

COUPON CUTTER

Robust weld test cutter for use in civil engineering.

EXAMO USB

EXAMO USB performs tests at the construction site – quick, reliable and uncomplicated.

VACUUM PUMP

Pump to generate a vacuum in the VACUUM BOX

VACUUM BELL

Testing bell for proving the tightness of double overlap welding seams in civil engineering