| 摘要 |
A device for sealing two plies of plastic film together generally includes an electrically conductive heating element and a rotatable support cylinder having an outer, circumferential surface, the cylinder being positioned in abutting relationship with the heating element and capable of rotating against the heating element, which is in fixed position, along a predetermined contact arc such that less than a complete circumference of the outer surface of the cylinder is in contact with the heating element. |
