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US 11,433,578 B2Granted
Mixing device for producing a plastic melt loaded with a propellant
AssigneeEngel Austria GmbH
InventorClemens Kastner
Life of this patent
Estimating the term…
Abstract
A mixing device for producing a plastic melt loaded with propellant, from which a foamed plastic part is producible in a molding machine, includes a mixing chamber, at least one propellant inlet device for feeding propellant into the mixing chamber, an inlet channel for plastic melt, and an output channel for dispensing plastic melt loaded with propellant. A first gas-tight shutoff device is provided for closing the inlet channel, and a second gas-tight shutoff device is provided for closing the output channel.
Claims19
An injection device for a molding machine, the injection device comprising:
- a mixing device for producing a plastic melt loaded with a propellant, from which a foamed plastic part is producible in the molding machine;
- and
- a plasticizing aggregate for melting a plastic starting product, for melting plastic and for conveying the plastic melt in an injection direction into an inlet channel of the mixing device,
- wherein the mixing device includes:
- a mixing chamber;
- at least one propellant inlet device for feeding the propellant into the mixing chamber;
- the inlet channel for the plastic melt;
- an output channel for dispensing the plastic melt loaded with the propellant;
- a first gas-tight shutoff device configured to close the inlet channel such that gas does not exit the mixing chamber through the inlet channel;
- and
- a second gas-tight shutoff device configured to close the output channel such that gas does not exit the mixing chamber through the output channel,
- wherein:
- the at least one propellant inlet device comprises a piston injector for forced injection;
- the plasticizing aggregate has a plasticizing cylinder, a rotatable plasticizing screw, and a drive device for the rotatable plasticizing screw;
- the rotatable plasticizing screw is rotatable and linearly displaceable;
- and
- the first gas-tight shutoff device is arranged between the rotatable plasticizing screw and the mixing chamber.
14 more elements
An injection device for a molding machine, the injection device comprising:
- a mixing device for producing a plastic melt loaded with a propellant, from which a foamed plastic part is producible in the molding machine;
- and
- a plasticizing aggregate for melting a plastic starting product, for melting plastic and for conveying the plastic melt in an injection direction into an inlet channel of the mixing device,
- wherein the mixing device includes:
- a mixing chamber;
- at least one propellant inlet device for feeding the propellant into the mixing chamber;
- the inlet channel for the plastic melt;
- an output channel for dispensing the plastic melt loaded with the propellant;
- a first gas-tight shutoff device configured to close the inlet channel such that gas does not exit the mixing chamber through the inlet channel;
- and
- a second gas-tight shutoff device configured to close the output channel such that gas does not exit the mixing chamber through the output channel,
- wherein:
- the at least one propellant inlet device comprises a piston injector for forced injection;
- the second gas-tight shutoff device, the output channel, the mixing chamber, the inlet channel, the first gas-tight shutoff device and the plasticizing aggregate are arranged along a longitudinal axis;
- the mixing chamber has an elongated shape with longitudinal walls that are parallel to the longitudinal axis;
- and
- the first gas-tight shutoff device is arranged between the plasticizing aggregate and the mixing chamber.
14 more elements
An injection device for a molding machine, the injection device comprising:
- a mixing device for producing a plastic melt loaded with a propellant, from which a foamed plastic part is producible in the molding machine;
- and
- a plasticizing aggregate for melting a plastic starting product, for melting plastic and for conveying the plastic melt in an injection direction into an inlet channel of the mixing device,
- wherein the mixing device includes:
- a mixing chamber;
- at least one propellant inlet device for feeding the propellant into the mixing chamber;
- the inlet channel for the plastic melt;
- an output channel for dispensing the plastic melt loaded with the propellant;
- a first gas-tight shutoff device configured to close the inlet channel such that gas does not exit the mixing chamber through the inlet channel;
- and
- a second gas-tight shutoff device configured to close the output channel such that gas does not exit the mixing chamber through the output channel,
- wherein:
- the at least one propellant inlet device comprises a piston injector for forced injection;
- the mixing chamber has a static mixer defined by a plurality of stationary mixing elements mounted on a wall of the mixing chamber, the plurality of stationary mixing elements being oblique with respect to a longitudinal axis of the mixing chamber;
- and
- the first gas-tight shutoff device is arranged between the plasticizing aggregate and the mixing chamber.
13 more elements
Dependencies are inferred from the claim text.