| 摘要 |
A gas jet emitter (20) emits, through a series of orifices (21), a row of gas jets which are diverted and spread by a deflecting plate (40). The spreading of the jets is however limited by impact with the adjacent jets, which gives rise in each jet to counter-rotatary vortices (45, 48) surrounding a laminar flow zone (44) at low pressure, into which a thin stream (S) of molten thermoplastic material is sent. The jets are directed against a main gaseous flow (18) into which they penetrate, forming interaction zones. The thin streams are thus stretched successively in two steps, but the second step may be omitted. The method applies in particular to manufacturing glass fibres. <IMAGE> |
