| 摘要 |
The invention relates to a method and an apparatus for induction sealing of a packaging material (2) which includes a layer of aluminium foil. The apparatus includes an inductor (1) with two parallel slightly spaced apart conductors (3) which are disposed in an electrically insulated carrier portion (4). The conductors are connected to one another and to a high frequency current source by means of two transverse conductors (6, 7). The transverse conductors (6, 7) are placed in the upper surface (8) of the inductor (1) and coincide with the outer defining lines (13) of the flat-laid material tube (2). Hereby, the current is led in a controlled fashion from the one conductor (3) to the other and a power output requirement is obtained for sealing the central zone of the packaging material (2) which is of the same magnitude as for the sealing of the edge zones of the packaging material (2). The inductor (1) of the above-described type is particularly adapted for sealing packaging material (2) which encloses products that are viscous, for example, tomato paste or fibrous products. <IMAGE> |
