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PVC tarpaulin machine, PVC tarpaulins welder principle of work: Using high-frequency (HF) equipment tubes self-excited oscillator high frequency magnetic field, making plastic parts within molecules is polarized between the electrodes and internal friction, moments of friction generates heat; use external mould under pressure to achieve the effect of weld shape. Using high-frequency welding of two or more plastic products, through this method of welding products, strength and solidity of the material itself is the same. Plastic heat sealing device of choice