| 摘要 |
<p>The invention relates to a method and apparatus for manufacturing ribbed pipes, wherein a formable mass in a plastic state is extruded into a substantially cylindrical forming space of a corrugator (12), said forming space being delimited by forming means, i.e. moulds (17), movable in the production direction of the apparatus and having grooves on the inner surface thereof for forming rib flanges (10), and a stationary kernel (16) forming the inner surface of the pipe, and wherein the mass formed as a pipe (18) in the forming space is cooled. In accordance with the invention, the ribbed pipe (18) is cooled from the inner surface of the pipe with the kernel (16) which extends an essential length externally of the forming space constituted by the forming means (17) of the corrugator (12).</p> |
