| 摘要 |
The open end of each tube section is continuously moved by retaining tools past a stationary source of radiant heat. The fused bead is then consolidated by the application of pressure. In this process, those end portions where the tube sections are to be closed by heat sealing are arranged one behind the other in planes which are at right angles to the direction of movement of said ends past the source of radiant heat. The tube sections are held in such a manner by the platelike holding tools that said end portions protrude from the holding tools toward the source of radiant heat. The tube sections are subsequently pulled to move the fused bead between the holding plates, which are slightly spaced apart. The holding plates are then pressed against the heat-sealed seams to consolidate the same.
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