A machine for drying and forming presspan and pressboard insulation components used in medium- and high-voltage transformers.
PRESA was designed for processes in which an insulation component must be formed and dried simultaneously under controlled conditions. The machine uses high-frequency technology to heat the material throughout its volume, rather than only from the surface.
In the PRESA process, HF/RF energy acts directly within the material, helping reduce drying time compared with conventional external heating. This is particularly important for moist or thicker components, or components formed in a mould.
The process can include placing the material in a mould, applying pressure, dielectric drying and setting the shape of the insulation component.
PRESA is ideal for manufacturing insulation components that require forming, drying and a stable shape after processing.
Zemat high frequency welding machines use systems designed to support operator safety, protect key machine components and maintain process stability. These solutions help protect the electrode, material, generator and work area, while process monitoring systems enable fast detection of irregularities and help maintain repeatable welding parameters.
For machines manufactured by Zemat, mandatory electromagnetic field (EMF) emission measurements are carried out in the working environment. The tests are performed by the Mobilab laboratory operating within Zemat Technology Group. The measurement laboratory works in accordance with ISO/IEC 17025 and holds PCA accreditation, confirming the quality of its services and the reliability of measurement results.
Zemat HF welding machines are designed in accordance with European requirements for machinery safety and energy efficiency. The applied solutions support process stability, reduce energy losses and help maintain repeatable production parameters.
HF Smart Control™ includes:
When purchasing a Zemat machine, customers also gain direct access to the team that knows its design, configuration and welding process. Zemat machines are supported by our own technical service team, so there is no need to rely on third-party providers or explain the machine and process from the beginning.
We support customers during installation and commissioning, train operators and maintenance teams, and provide technical service worldwide. In many cases, issues can also be diagnosed and resolved remotely by checking machine settings, recipes, process parameters or system messages without waiting for an on-site service visit.
Every welding process has different requirements, so the machine configuration is selected according to the specific product, material, component dimensions and planned production conditions.
Tell us what you need to weld and how your process works. Based on this information, we can help select the right machine model, generator power, working area, operating method, tooling and any additional equipment required.
PRESA forms and dries insulation components used in medium- and high-voltage transformers. Typical applications include yoke collars, corner collars and presspan components.
The machine is designed for presspan and pressboard used to manufacture transformer insulation components.
PRESA can produce yoke collars, corner collars and other insulation components that require forming, drying and a stable shape.
In the high-frequency process, the material is heated throughout its volume, rather than only from the surface. This can make drying and forming faster than in a conventional heated press or oven.
Yes. The machine allows a component to be formed in a tool while the material is simultaneously dried using high-frequency energy.
Yes. Moulds and working components can be designed for a specific collar type, radius, orientation and process requirements. Zemat's in-house tooling department can tailor the tool to the customer's product.
The thickness range depends on the component and material. The machine can handle thin corner collars as well as thicker yoke collars made of presspan or insulation board.
Yes. The HMI panel with PLC control allows recipes to be saved for different components. This makes it easier to repeat the process and change settings more quickly between products.
Yes. The machine allows control of parameters including process time, temperature, HF power and pressing force. ATS™ and WCS™ systems help maintain stable operating parameters and check that the process remains within the set range.
