| 摘要 |
<p>The invention relates to a method for introducing additives into flowing or fluidised media. The spatially predetermined position of the additives in th e flowing material, also called fluid bed, is obtained by controlling the pulsating injection. The introduction and exact dosing of additives, that is hardeners, dyes, gas producers and softeners for instance, into a liquid plastic stream or metal stream (10) for instance or the fluid bed of bulk material, such as powder, granules and pellets, is carried out by means of a n injector. The invention is used in melting units, in hot channel systems, in tools, components of tools and injection moulding machines, extruder-, injection moulding-, pelleting-, burner- and injection arrangements. The nozzle needle (3) of at least one nozzle (2) respectively is variably and highly precisely moved for the introduction by means of a device and in such a way that the additive (17) is dosed exactly in relation to the volume flow o f the medium and that a pulsating stream (18, 36) is injected into the medium flowing past, by means of at least one well-aimed nozzle opening (4). The additives are dosed by means of a pressure that can be adjusted variably, pulse width and pulse frequency. The desired homogenous distribution is obtained by the penetrating injection jet (37) during compounding for instan ce.</p> |
