| 摘要 |
This device blocks a melt, esp. of plastic in a tube, by the novel use of a cooling zone through which the melt flows. This is established by cooling pipes (12, 35) so spaced and directed, that on cooling the melt, it bridges (14, 15) solidly, to form a complete blockage transverse to the flow. Pref. on the side of approaching flow the cooling pipes are developed with a roof shape, where the solidified bridges (14, 15) wedge themselves. On the downstream side they may have a similar shape. To allow melt flow, a heating medium is supplied to the cooling pipes. The arrangement immediately precedes the nozzle plate, the nozzle of which may be closed by their own slide. |
