| 摘要 |
<p>The side seam of a can is coated and heated inductively by passing it through a medium frequency, oscillating magnetic field generated by an induction coil wound around a core. The core is shaped and oriented so as to have two magnetically opposite poles direct magnetic flux in a concentrated manner from the coil into the side seams of cans traveling along a path of travel. The cores are constructed using individual laminations of high frequency core material, each less than about .006 inches thick, individually insulated from each other and bound together to form a U- or E-shaped core directing flux toward the workpiece. The induction coil is constructed using a form of Litz wire and the coil and core are air-cooled. In one embodiment, the core has a plurality of pole pieces each directed toward the path of travel. The induction coil is wound on the core such that sequential ones of the pole pieces along the path of travel have alternatingly magnetically opposite polarities. In one embodiment, the inductive heating apparatus is used as a pre-curing stage, downstream of a side seam inside coat applicator and upstream of a curing oven, but located in close enough proximity to the side seam inside coat applicator to heat the coating sufficiently to bind it in place so that it does not fall off the seam and onto the conveyor before it reaches the curing oven. <IMAGE></p> |
