US 11,654,598 B2
Method for changing the material in an extrusion device
Ansgar Avermeyer, Georgsmarienhütte (DE); Tobias Kulgemeyer, Hagen a. T. W. (DE); Markus Bussmann, Essen (DE); Jens Minnerup, Emsdetten (DE); and Martin Backmann, Lengerich (DE)
Assigned to Windmöller & Hölscher KG, Lengerich (DE)
Filed by Windmöller & Hölscher KG, Lengerich (DE)
Filed on Dec. 5, 2017, as Appl. No. 15/832,592.
Application 15/832,592 is a continuation of application No. PCT/EP2016/060447, filed on May 10, 2016.
Claims priority of application No. 10 2015 108 978.5 (DE), filed on Jun. 8, 2015.
Prior Publication US 2018/0093395 A1, Apr. 5, 2018
Int. Cl. B29B 7/60 (2006.01); B29C 48/92 (2019.01); B29C 48/27 (2019.01); B29C 48/285 (2019.01); B29C 48/08 (2019.01); B29C 48/10 (2019.01); B29C 48/25 (2019.01)
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
OG exemplary drawing
 
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.