| 摘要 |
A cooling device, for a continuous prodn. unit for synthetic internal annular parts, made from at least one tubular blank (13) exiting from an extruder (10), forming at least two parallel mould chains (15a, 15b) each part of an endless chain and defining between them an impression (5) in the form of a tunnel, and an inner cylinder (22) gauging the inner face of the annular part (6). A nozzle (24) is situated at the end of the gauging cylinder (22) and is fed with compressed air which exits longitudinally as a thin annular blade of air (41) of low output but high speed driving the air contained in the annular part (6) and from the axial tube (25) extending into the part and so upstream. This forms the closed cooling current at least over the greater length of the tunnel form impression (5). |
