high frequency plastic seam welder machinery 1)double side sealing 2) ... cardbard,automobile ornaments,sunshade,trademarks,garments,shoe and cap embossing,leather embossing;gas mattress,boat,life ... current protection device.At emergency it can cut off high volyage automatically to protect electron tube ... current which can bring spark and cut it off,meanwhile alert the operator3.Vibrate current setting: ...