METHOD AND DEVICE FOR MANUFACTURING PACKAGES Russian patent published in 2008 - IPC B29C65/36 

FIELD: transportation.

SUBSTANCE: invention relates to induction method and devices for sealing tubular package seams. The proposed method consists in making the first tubular part of the package from a sheet made from a thermo plastically coated packing material containing, at least, one layer of induction-heated material. Here, the package first part has sealed first joint between two opposite edge sheet sections. Then, of first and second parts the package are jointed together by forming the second joint between the package first and second parts so that both said joint intersect. Additionally, a means for induction heating is arranged including, at least, two conductors running parallel along the second joint to seal the said second joint by feeding induction current from the induction heating means. Note here, that induction current runs in the conductor along the second joint in one direction, while in the other conductor the said current runs in opposite direction along the said second joint. Note also that every of the aforesaid, at least, two conductors seal one intermediate joint of the second joint.

EFFECT: induced heating current runs all along the entire joint without dispersion of induced current to allow sealed and durable joint.

31 cl, 40 dwg