| 摘要 |
A method and apparatus for slit sealing thermoplastic materials, primarily linear low density polyethylene, either alone or with coextrusions of other materials. The material is passed over a presealing roll, and the area to be slit is presealed using heated air. Very quickly after the presealing, the material is slit with a heated knife blade, the slit edges being sealed by dragging along the sides of the heated blade. The cutting edge of the blade is angled to roll a bead upwardly on the material, and the slit edges are held taut and separated by an edge holding device.
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