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Perhaps you have stood a copper stretch wrapping machine out of the blue lose power only to begin their work a few days later, or had your armature bar stick with the copper coils or perhaps the contact screw and turn into stuck? The problem may have resolved itself randomly, or possibly your stretch wrapping machine may have were built with a mindset adjustment following a few quick slams against a desktop or other hard surface… or it could have lately eliminate altogether. Why this happen? It’s typically due to poor hysteresis, that’s a delay involving the electromagnetic field breaking as well as the coils’ magnetic condition dissipating mid cycle, when the machine is turned off, or else dissipating whatsoever. Usually this issue is because of poor material in the copper coil’s core that forestalls its domains from returning to some random condition when the electromagnetic field is broken. An amount of residual magnetism–that’s typically an issue with inexpensively-made coil stretch wrapping machines–prevents the domains in the coils’ metal cores from returning for their natural, uncharged states. Sometimes giving your machine an excellent smack can realign the domains and demagnetize the cores. Degassing can be a less distressing, but furthermore much pricier, other option for fixing this issue that involves demagnetizing by usage of electric coils.
Overall, the best option yet would be to begin getting an excellent horizontal stretch copper coil wrapping machine and steer obvious from the problem of residual magnetism altogether!