Installation for the treatment and further processing of thermoplastics and method for the operation thereof
View Patent ↗An installation for the treatment and further processing of thermoplastics comprises a screw-type compounding unit, downstream of which is disposed an intermittently drivable processing unit. Provision is made for a control unit which is connected with a drive of the screw-type compounding unit and with the drive of a metering device and with a drive of the processing unit. The control unit is designed for triggering the drives by the cycle time of the processing unit, the drives having identical run-up times and identical deceleration times.
1. An installation for the treatment and further processing of thermoplastics, comprising
an extruder ( 1 ), which has
a housing ( 2 ),
at least one screw ( 5 , 5 ′) disposed in the housing ( 2 ),
an electric motor ( 6 ) coupled with the at least one screw ( 5 , 5 ′), said electric motor having a run-up time t H and a deceleration time t B , wherein said electric motor is coupled to said screw in a manner to drive said screw when said electric motor is running
at least one metering device ( 10 , 14 ) with a metering motor ( 12 , 15 ), said metering motor having a run-up time t H and a deceleration time t B ,
a processing unit ( 26 , 30 ) directly downstream of the extruder ( 1 ), said processing unit having a drive ( 28 ), said processing unit having cycle time t T ,
a control unit ( 29 ), electronically interfaced with the electric motor ( 6 ), the metering motor ( 12 , 15 ), and the drive ( 28 ) of the processing unit ( 26 , 30 ), and
wherein said control unit is configured and interfaced to: control said drive of said processing unit to intermittently operate for said cycle time t T , control said electric motor and said metering motor so as to trigger their operation in accordance with the cycle time t T , and only trigger the operation of the electric motor and metering motor when a melt strand is ready to be extruded to the processing unit, and
wherein said metering motor and electric motor have identical run-up and deceleration times.
2. An installation according to claim 1 , wherein t T ≦5 mm. applies to the cycle time t T .
3. An installation according to claim 2 , wherein t T ≦2 min. applies to the cycle time t T .
4. An installation according to claim 3 , wherein t T ≦40 sec. applies to the cycle time t T .
5. An installation according to claim 1 , wherein the extruder ( 1 ) comprises a first metering device ( 10 ) and a second metering device ( 14 ).
6. An installation according to claim 1 , wherein the extruder ( 1 ) comprises an inlet ( 16 ) for rovings ( 17 ).
7. An installation according to claim 1 , wherein the processing unit is a plunger-injection molding machine ( 30 ).
8. An installation according to claim 1 , wherein the extruder ( 1 ) is a twin-screw machine.
9. An installation according to claim 1 , wherein the extruder ( 1 ) is a twin-screw extruder.