| 摘要 |
In the production of multi-component plastics, in particular those with solids as additive to at least one of the components, said multi-component plastics are transported with the aid of a piston-cylinder unit consisting of a metering cylinder and a drive cylinder. The variation of the component flow rate in the metering cylinder is brought about by varying the conveying rate of a hydraulic pressure medium which can act on the drive cylinder. To relieve the sealing elements, in particular to relieve the roof-type sleeve seal sealing off the components in the metering cylinder, the space between the sealing elements arranged at a distance from one another is acted on by a sealing liquid which is chemically neutral with respect to the material of the sealing elements. In this manner, penetration of abrasive solid particles into roof-type sleeve seals is prevented and the plastic component and the sealing liquid are always under proportionally the same pressure difference in temporal sequence.
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