| 摘要 |
<p>Superimposed laminar workpieces are joined along a desired seam line by passing them together between anvil means such as a roller (which may be plain surfaced or engraved as with a pattern of lines or dots) extending transversely to the direction of travel of the workpieces relative thereto, and at least one workhead traversable across said anvil means selectively to heat said workpieces along said desired seam line to heat join them together.</p> |
