| 摘要 |
PURPOSE: To provide a mixing head for surely avoiding the blockage of the cleaning piston. CONSTITUTION: The blockage of a cleaning piston 2 in a mixing head for producing a flowable reactive mixture which forms a massive or foamy plastic material is avoided in that depressions 7 in the form of annular grooves 7 alternating with lands 8 are provided in the wall 6 of a mixing chamber borehole 3, the reactive mixture curing to a resilient mass 9. |
