How is PVC welded?

PVC welding uses high frequency to join materials together, resulting in strong joints comparable to the original material. In high-frequency welding, electromagnetic field energy is crucial, generating heat within the parts to be joined. The technology is based on the specific properties of the polymers and the dielectric loss factor, which determines the efficiency of the process and its application in industry. What specifically does PVC welding involve?

Read more: The most important information about PVC welding

Properties of welding materials

High-frequency (HF) welding is made possible thanks to the specific properties of the materials, which generate heat in an alternating electromagnetic field. Polyvinyl chloride (PVC) and polyurethanes (PU, TPU) dominate due to process efficiency and strong joints. Other polymers, such as PET-G, require special conditions, such as heated electrodes. HF welding is used in a variety of industries and the flexibility of the process allows decorative joints to be created, making it a versatile solution.

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Operation of electrodes in the PVC welding process

In the high-frequency welding process, electrodes play a key role, exerting pressure on the materials to be joined during heating. They act as electromagnetic field conductors, concentrating energy in the seal area. This allows the molecules of polar thermoplastics to oscillate, converting some of the oscillatory motion into thermal energy. The quality of the weld depends on the geometry of the electrodes and the material used. It is also worth paying attention to the type of machine and its design, as this affects radio frequency field emissions and operator safety.

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Types of welder machines

Zemat Technology Group offers a wide range of industrial plastic welder machines to suit different technologies and applications. Among the most commonly used equipment are high-frequency (HF) welder machines, impulse sealer machines and fixed-heat sealer machines. HF welder machines are used in large-format PVC and TPU production – including the manufacture of tarpaulins, tents, medical mattresses, protective covers and advertising items. Impulse welders are mainly used in the sun shading industry for the production of roller blinds, mosquito nets, shutters or film screens. Fixed-heat machines work well with thin films and delicate technical fabrics. In addition, Zemat offers automatic lines and welding process support systems that increase productivity and precision in series production.

In the case of process automation, advanced machines capable of continuous operation are used. By adjusting the parameters of the PVC welder, it is possible to adapt the intensity of the electromagnetic field to the specific characteristics of the material being used, which influences the efficiency of the entire process. Choosing the right equipment is crucial to the quality and durability of the joints achieved.