An induction heating apparatus for heating a traveling metal plate includes an induction coil for surrounding the metal plate. The induction coil includes an upper induction coil for being located above the metal plate and a lower induction coil for being located below the metal plate. The upper and lower induction coils are spaced from each other in a longitudinal direction of the metal plate a constant distance across a transverse direction of the metal plate. Each of the upper induction coil and the lower induction coil is arranged obliquely at an edge area of the metal plate so as to form an oblique angle with the transverse direction of the metal plate.

Induction heating device for a metal plate

The invention relates to a process for the continuous heat treatment of steel strip material whose thickness d1, d2 periodically varies along its length, more particularly of strip flexibly rolled with a roll gap varying as a function of time, wherein the continuous heat treatment of the strip material takes place while the strip material passes through an induction furnace in which the strip material is induction heated at a constant frequency which can be selected to be such that the mathematical induction depth δ of the induced current up to which the magnetic field has been reduced to 63% of the field strength of the outer field is greater than half the thickness of the strip portions with the smallest thickness d2.

Heat treatment of flexibly rolled strip

An induction heating sealing device (30) for sealing a packaging material comprising an electrically conductive layer and advancing, in use, along a first direction (A), said induction heating sealing device (30) comprising an inductive element (100), said inductive element (100) comprising a first leg (31) extending along said first direction (A) and within which, in use, an alternate currents flows, said first leg (31) facing, in use, an area (44) of said packaging material to be sealed and being configured to induce, in use, an eddy current within said area (44), and a second leg (32) arranged on one side of said first leg (31) and facing a further area (45) of said packaging material, wherein said first leg (31) comprises at least one first portion (41) and at least one second portion (42) spaced apart from one another in a second direction (S) transversal to said first direction (A).

Induction heating sealing device

Dispositif pour tremper et/ou orienter des pièces de façon continue.

Continuous heat treatment involves carrying out a continuous heating of strip material in passage through an induction furnace, in which the strip material is inductively heated at constant frequency. The strip material is selected such that the calculated penetration depth of the induced current is higher than the half thickness of the strip section with narrow thickness.

Heat treatment of flexibly rolled sheet

Induction heater for flat work pieces.. GC-. Particularly for heating continuously travelling strip or sheet, the conductors of a pair carrying current in opposite directions are respectively mounted adjacent to opposite faces of the flat workpiece but offset horizontally, this offset being, however, small relative to the offset between any two conductors on the same side of the workpiece. The offset may be adjustable or the leads rotatable about their long axes. Separate (e.g. hairpin) inductors may be mounted on opposite sides of the workpiece with their corresponding conductors offset, their mean currents being preferably equal and antiphased. The arrangement overcomes the problem of fluxing thin material conventionally requiring high frequency, and accommodates itself to workpieces of different thickness.

Siegfried Szamer

Papers

Induction heater for flat work pieces