HIgh Frequency welding machines for
crystal clear PVC and invisible welds

CRYSTAL high frequency welder is created for the production of crystal clear PVC windows and cinema and projection screens with Invisible Seam technology. With the use of special tools, the CRYSTAL HF welder creates a strong and very thin linear weld to join crystal clear PVC film.

CRYSTAL ECO is an economical version of a high-frequency welding machine designed for making invisible welds for example in transparent foil. A manually sliding table of any dimensions facilitates working with wide rolls.





Durable, invisible weld

The machine has a 6 m work table. A special back and front trough configuration and fabric layout during welding provides effective and an automatic weld/cut/press cycle to make the thin-line weld virtually invisible. The final pressing (if needed) is achieved with a separate, independent welding bar, which can be used for omega profiles and standard linear welds as well.

Fully advanced programming functionality, including ATS™ auto-tuning and WCS™ systems, is achieved thanks to an onboard PLC integrated with a 10″ touch screen HMI. CRYSTAL machines have smooth HF power output 1-4 kW with high precision down stroke mechanism and a pressure control.

The vacuum section of the work table with special magnetic attachments allow for easy positioning of films/fabrics and welding of zippers with the use of optional tools. The CRYSTAL high frequency welder machine is a ready to use solution. There is no need for assembly and special installation.

CRYSTAL ECO High Frequency welding machine

Crystal Eco HF Welder 7a

Efficient machine for crystal clear PVC and invisible welds

CRYSTAL ECO HF WELDER was created for the simple and economic production of CRYSTAL Clear PVC windows with Invisible Seam technology.

With the use of special welding tools (electrodes) CRYSTAL ECO HF welder creates a strong and very thin linear weld to bond the Crystal Clear PVC film and flatten the seam.

Crystal Eco HF Welder 6

Crystal Eco


Our special tooling is dedicated specifically to handle the unique demands of welding zippers and keders with PVC crystal clear film. The result is a streamlined production process that delivers exceptional results every time.

Crystal Eco HF Welder 10


Manual locking system to setup the exact depth of the weld depending on the thickness of the PVC clear film.

The actuator gives great control over the welding process and ensures an aesthetic, straight and STRONG weld as well preventing the uncontrollable flow of melted material.

Crystal Eco HF Welder 11


  • Standard 4.2 m long Magnetic Stainless Steel table with 8.6 m overall length in footprint
  • Easy table leveling with height adjustable legs.
  • Machine work table anchored to the floor during installation.

Why is our technology unique?

WCS™ Weld Check System
Verifying and signaling the HF/RF weld preset parameters / end cycle process. Collects all data pertaining to each weld cycle for remote diagnosis of any issues or problems with machine setup or power output.
QuickGrip™ System
System for quick and easy replacement of electrodes. The electrodes are attached with pneumatic clamps activated from the control panel.
AntiFlash™ System
Ultra-fast Solid-State ARC sensor & full output overload protection.
ZTG iCOM™ System
Built-in VPN client and VNC server making up the internet interface allowing remote control of machine parameters, weld cycle and diagnostics or software upgrade.
Safety guards
Special guards with safety limit switches designed for protection against electromagnetic radiation (compliance with EN and EMC standards).


ZEMAT TG High Frequency welding machines are designed and built to very strict European Environmental and Safety regulations and have custom design solutions for weld and safety control.

ECO-Friendly HF Technology incorporated in the High Frequency machines contains:

Low energy consumption

| Energy efficient ECO HF generators with microprocessor control of output power
| Low power consumption and real time power output recognition
| 90% less power consumption than with traditional heat powered welding systems

AutoTuning System™

| Dynamic High-performance HF impedance matching
| Dynamic Auto Tuning and Arc protection unit
| Ultra-fast reflected power control

Highly efficient and stable HF generators

| RF power output efficiency at 70-90%
| Harmonic distortions eliminated by frequency band filters
| Very limited heat dissipation preventing overheating