US 12,441,039 B2
Method and device for producing marbled molded parts and method for producing the device
Reinhard Jakobi, Ludwigshafen (DE); Angelika Homes, Ludwigshafen (DE); Susanne Zeiher, Ludwigshafen (DE); Daniel Leutz, Ludwigshafen (DE); Natascha Manuela Meierhoefer, Ludwigshafen (DE); Rafael Gimenez Casat, Ludwigshafen (DE); Marcus Imo, Ludwigshafen (DE); Sascha Tim Schwendy, Ludwigshafen (DE); and Leonhard Ullrich, Ludwigshafen (DE)
Assigned to BASF SE, Ludwigshafen am Rhein (DE)
Appl. No. 17/768,500
Filed by BASF SE, Ludwigshafen am Rhein (DE)
PCT Filed Oct. 13, 2020, PCT No. PCT/EP2020/078776
§ 371(c)(1), (2) Date Apr. 13, 2022,
PCT Pub. No. WO2021/074150, PCT Pub. Date Apr. 22, 2021.
Claims priority of application No. 19203163 (EP), filed on Oct. 15, 2019; and application No. 20172936 (EP), filed on May 5, 2020.
Prior Publication US 2024/0092000 A1, Mar. 21, 2024
Int. Cl. B29C 45/16 (2006.01); B29C 33/38 (2006.01); B29C 45/00 (2006.01); B29C 45/20 (2006.01); B29C 45/30 (2006.01); B29C 45/50 (2006.01); B33Y 10/00 (2015.01); B33Y 80/00 (2015.01); B29K 67/00 (2006.01); B29K 105/00 (2006.01); B29L 31/00 (2006.01)
CPC B29C 45/1634 (2013.01) [B29C 45/0046 (2013.01); B29C 45/16 (2013.01); B29C 45/20 (2013.01); B29C 45/30 (2013.01); B29C 45/50 (2013.01); B33Y 80/00 (2014.12); B29C 33/3842 (2013.01); B29C 2045/1698 (2013.01); B29C 2045/308 (2013.01); B29K 2067/006 (2013.01); B29K 2105/0032 (2013.01); B29K 2995/0021 (2013.01); B29L 2031/7132 (2013.01); B33Y 10/00 (2014.12)] 9 Claims
OG exemplary drawing
 
1. A process for producing marbled moldings, wherein a first molding compound and at least one further molding compound are injected from an injection unit of a screw injection molding machine into an injection mold, wherein the injection unit comprises a hollow barrel, a screw having a screw tip and a nozzle, and the screw is rotatable and is disposed in the hollow barrel so as to be movable in the direction of the longitudinal axis of the hollow barrel between a forward position and a backward position, with a smaller distance between the screw tip and the nozzle in the forward position than in the backward position, and wherein the first molding compound comprises a first polymer compound and a first colorant, and the at least one further molding compound comprises a further polymer compound and optionally at least one further colorant, comprising the following steps:
a) optionally feeding a first amount of the first molding compound onto the screw when the screw is in the backward position,
b) advancing the screw from the backward position into the forward position,
c) feeding a second amount of the at least one further molding compound onto the screw,
d) plastifying the first molding compound and the at least one further molding compound in the hollow barrel of the screw, with rotation of the screw and conveying of at least a portion of the first molding compound and at least a portion of the at least one further molding compound into a clear space in the hollow barrel between the nozzle and the screw tip, and with the screw moving from the forward position into the backward position,
e) feeding a new first amount of the first molding compound onto the screw when the screw is in the backward position,
f) injecting the first molding compound and the at least one further molding compound from the clear space in the hollow barrel into the cavity of the injection mold, with the screw advancing from the backward position into the forward position,
g) cooling the first molding compound and the at least one further molding compound in the injection mold, so as to give a marbled molding, and
h) removing the marbled molding from the injection mold,
wherein steps c) to h) are repeated, step c) is conducted before step f), and step a) is optionally conducted before step b), and
wherein the feeding of the new first amount of the first molding compound in step e) and optionally the feeding of the first amount of the first molding compound in step a) is conducted separately in time or space from the feeding of the second amount of the at least one further molding compound in step c), and wherein the feeding of the second amount of the at least one further molding compound in step c) is conducted after the advancing in step b).