| 摘要 |
<p>The instant invention is directed to an injection nozzle for mixheads for the production of foams or solids from at least two flowable reaction components, comprising a nozzle housing with a nozzle needle guided in it which is provided with a positive control and cooperates with a nozzle opening, wherein a feed pipe and a return pipe end upstream of the nozzle opening in said nozzle housing and wherein said nozzle needle in its closed position connects said feed pipe and said return pipe to each other via a connecting channel, characterized in that said nozzle needle is divided into a needle core and a needle sleeve which surrounds said needle core and is guided on it, wherein said needle core cooperates with said nozzle opening and is pin-less in design and wherein said needle sleeve is provided with said connecting channel; and in that, when switching over from injection to return, said needle core is located in the closed position sooner than said needle sleeve in the return position, and when switching over from return to injection, said needle sleeve adopts the interruption position before said needle core occupies the open position.</p> |
