CPC B29B 7/603 (2013.01) [B29C 48/08 (2019.02); B29C 48/10 (2019.02); B29C 48/2692 (2019.02); B29C 48/271 (2019.02); B29C 48/286 (2019.02); B29C 48/288 (2019.02); B29C 48/92 (2019.02); B29C 2948/9298 (2019.02); B29C 2948/92333 (2019.02)] | 8 Claims |
1. A method for changing material in at least four extrusion devices, each comprising at least two supply devices for supplying feedstock for an extruder, comprising the following steps:
identifying a change request for changing the material in at least one of the at least four extrusion devices,
preparing the supply devices for changing the material by lowering a filling level of the at least two supply devices of the at least one of the at least four extrusion devices, wherein the filling level is lowered to a changing filling level which is held fluctuating to not fall below the changing filling level,
separating the at least two supply devices of the at least one of the at least four extrusion devices from a feed of feedstock to the extruder,
discharging feedstock from the separated supply devices to empty the at least two supply devices of the at least one of the at least four extrusion devices,
filling subsequent material into the empty supply devices, wherein a discharge container is cleaned to prepare the supply devices, wherein the discharge container is removable from the respective supply device after the discharge container is filled with discharged feedstock,
wherein the steps are carried out in a production machine comprising the at least four extrusion devices, wherein each of the at least four extrusion devices produces one layer of a plastic film.
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