| 摘要 |
Method and apparatus for sealing the end of a thermoplastic tube wherein a tapered mandrel is heated to a temperature above the melting point of the tube and is inserted into the tube to force direct contact of the tube with the mandrel. After the contacted surface has fused, the mandrel is raised and a heated jet of air expands the tube, allowing the mandrel to be withdrawn. Jaws clamp the mandrel surfaces together to form the seal.
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