Device and method for the production of plastic parts with drying and dessicant feed devices
A device ( 1 ) and method for the production of plastic parts ( 2 ), having a first plastic feed device ( 3 a) for feeding a first liquid plastic starting component (K 1 ); a second plastic feed device ( 3 b) for feeding a second liquid plastic starting component (K 2 ); a mixing device ( 5 ) with a mixing chamber ( 6 ), wherein in the mixing chamber the liquid plastic starting components that can be fed by the plastic feed devices can be mixed to form a plastic mixture (KG); a discharge nozzle ( 7 ) for discharging the plastic mixture; and a cooling device ( 8 ) for the mixing device, wherein a drying device ( 9 ) surrounding the mixing device at least in regions is provided, wherein the drying device has a separating device ( 10 ), a drying chamber (T) formed between the separating device and the mixing device, and a desiccant feeding device ( 11 ) opening into the drying chamber are disclosed.
1. A device ( 1 ) for producing plastics parts ( 2 ), comprising
a first plastics feed device ( 3 a ) for feeding a first liquid plastics starting component (K 1 ),
a second plastics feed device ( 3 b ) for feeding a second liquid plastics starting component (K 2 ),
a mixing device ( 5 ) having a mixing chamber ( 6 ), the liquid plastics starting components (K 1 , K 2 ) which can be fed by the plastics feed devices ( 3 a , 3 b ) being mixable in the mixing chamber ( 6 ) to form a plastics mixture (KG) from the mixing device ( 5 ),
a discharge nozzle ( 7 ) for discharging the plastics mixture (KG), and
a cooling device ( 8 ) for the mixing device ( 5 ), characterized by
a drying device ( 9 ) surrounding the mixing device ( 5 ) at least in regions, the drying device ( 9 ) comprising a separating device ( 10 ), a drying chamber (T) formed between the separating device ( 10 ) and the mixing device ( 5 ), and a desiccant feed device ( 11 ) for feeding a desiccant opening into the drying chamber (T),
wherein the desiccant feed device ( 11 ) has a desiccant source ( 12 ), a compressed air generating device, and a tubular or pipe-shaped feed element ( 13 ) which is connected to the desiccant source ( 12 ), and
the tubular or pipe-shaped feed element ( 13 ) is directed toward the discharge nozzle ( 7 ).
2. The device according to claim 1 , characterized in that compressed air (L) is introduced continuously by the desiccant feed device ( 11 ).
3. The device according to claim 1 , characterized in that the desiccant, in the form of compressed air (L) or in the form of a protective gas, has a dew point of below 10° C.
4. The device according to claim 1 , characterized in that the separating device ( 10 ) has a base region ( 10 a ) that has an opening ( 10 d ) which is arranged centrally in the base region ( 10 a ), through which opening the discharge nozzle ( 7 ) projects.
5. The device according to claim 1 , characterized in that the cooling device ( 8 ) has at least one cooling duct ( 14 ) which is undulating and formed in a housing ( 15 ) of the mixing device ( 5 ).
6. The device according to claim 1 , characterized in that the separating device ( 10 ) is made of a fiber-reinforced plastics material or a rigid plastics material.
7. The device according to claim 6 , characterized in that the fiber-reinforced plastics material or the rigid plastics material of the separating device ( 10 ) contains polyamide, polyethylene or polypropylene.
8. The device according to claim 1 , characterized by a gas feed device ( 4 ) for feeding gas (G) to the first liquid plastics starting component (K 1 ), to the second liquid plastics starting component (K 2 ) or to the plastics mixture (KG).
9. A device ( 1 ) for producing plastics parts ( 2 ), comprising
a first plastics feed device ( 3 a ) for feeding a first liquid plastics starting component (K 1 ),
a second plastics feed device ( 3 b ) for feeding a second liquid plastics starting component (K 2 ),
a mixing device ( 5 ) having a mixing chamber ( 6 ), the liquid plastics starting components (K 1 , K 2 ) which can be fed by the plastics feed devices ( 3 a , 3 b ) being mixable in the mixing chamber ( 6 ) to form a plastics mixture (KG) from the mixing device ( 5 ),
a discharge nozzle ( 7 ) for discharging the plastics mixture (KG), and
a cooling device ( 8 ) for the mixing device ( 5 ),
wherein the device has a longitudinal axis (X);
characterized
by a drying device ( 9 ) surrounding the mixing device ( 5 ) at least in regions, the drying device ( 9 ) comprising a separating device ( 10 ), a drying chamber (T) formed between the separating device ( 10 ) and the mixing device ( 5 ), and a desiccant feed device ( 11 ) opening into the drying chamber (T),
wherein the separating device ( 10 ) has a base region ( 10 a ) which separates the drying chamber (T) from a surrounding area (U) in the axial direction, and a lateral region ( 10 b ) connected to the base region ( 10 a ), which separates the drying chamber (T) from the surrounding area (U) in the radial direction and the separating device ( 10 ) is open to the surrounding area (U) in an opposing region ( 10 c ) facing away from the base region ( 10 a ), and
the lateral region ( 10 b ) surrounds the mixing device ( 5 ) in the radial direction.