| 摘要 |
A device (42) for heating of a layer of heat-sealable plastic in a first edge portion (52) of a sheet (44) of packaging material, the first edge portion being arranged to, after heating, form a sealed, overlapping joint with an opposite second edge portion (54) of the sheet for forming of a tube (46), is provided. The device comprises a heat rail (10) having a heat surface (12) along which the heat rail is arranged to heat the first edge portion. The device further comprises a counter rail (34) having a counter surface (36) which is arranged to face the first edge portion. The rails are arranged to be positioned opposite each other on an inner side (48) and an outer side (50), respectively, of the first edge portion during heating. The device is characterized in that it further comprises a projecting positioning flange (16) which is arranged along the heat rail and arranged to be inserted on the inner side of the first edge portion to facilitate subsequent positioning of the rails for heating. The positioning flange is inclined in relation to the heat surface of the heat rail so that a material contact surface (22) of the positioning flange leans away from the counter surface of the counter rail. |
