Function
How the system works
| Two laser-drilled circular-shaped screen discs are located parallel to each other in a casing. Between them rotates a “scraper disc“ with spiral scraper rows on each side. The surface of the smooth, hardened screen discs is continuously scraped clean of impurities b the scrapers pressing down on them. Thanks to the spiral form, the scrapers transport the impurities to the centre of the screen disk. The now compressed impurities are transferred to coaxially located discharge screws and removed with precision. |
The continuous of the impurities from the screen surface ensures the auto-matic removal of even very high levels of contamination from plastic melt. The scraper disc speed depends on the level of impurity of the melt to be filtered, and therefore on the pressure increase before the filter, and can be carried out automatically depending on the pressure (“pressure constant operation“).
Field of application
| The filter system is ideal for the separation of so-called “soft“ impurities such as paper, wood, aluminium, copper etc; not, however, for filtering thermally unstable melts or melts containing high amounts of instable printing ink as well as not for the filtration of larger quantities of hard impurities such as sand, glass, grinding dust, etc. The type and quantity of impurities to be removed have a major influence on the working life of the wear parts of the filtering system, screen discs and scrapers. Hardened, laser-drilled screen disc |
