Abstract: The invention relates to a method for producing polyolefin recyclates, in particular HDPE recyclates. In a specified sequence, color-mixed polyolefin-containing groups are washed at a low temperature, washed at an increased temperature in an alkaline medium, flake-sorted, and treated at an increased temperature in order to remove migration materials. By virtue of the aforementioned method, polyolefin recyclates can be obtained with a substantially improved degree of purity compared to hitherto commercially available recyclates, said recyclates being usable in the production of novel consumer product packaging. Additionally, unpleasant odors connected to known polyolefin recyclates due to the decomposition products of migration materials formed during the extrusion process are largely prevented.

Abstract: The invention relates to a method for producing polyolefin recyclates, in particular HDPE recyclates. In a specified sequence, color-mixed polyolefin-containing groups are washed at a low temperature, washed at an increased temperature in an alkaline medium, flake-sorted, and treated at an increased temperature in order to remove migration materials. By virtue of the aforementioned method, polyolefin recyclates can be obtained with a substantially improved degree of purity compared to hitherto commercially available recyclates, said recyclates being usable in the production of novel consumer product packaging. Additionally, unpleasant odors connected to known polyolefin recyclates due to the decomposition products of migration materials formed during the extrusion process are largely prevented.

Abstract: In situ lehr-roll cleaning apparatus includes a carriage supported within the space between first and second adjacent rolls, the carriage having a first set of elements contacting the surface of the first roll and a second set of elements contacting the surface of the second roll, whereby the carriage is movable back and forth along a path parallel to the rolls. A mechanism such as a rotating wire wheel disposed on the carriage is used to clean at least one of the first and second rolls as the carriage moves along the path and in between the adjacent rolls. The invention further including means for forcing the carriage away from an adjacent roll toward the one being cleaned so that the elements contacting the surface of the roll being cleaned are forced thereagainst to precisely position the cleaning mechanism relative to the surface. Means are preferably further provided for fine-adjusting the distance of the cleaning mechanism relative to the surface of the roll being cleaned.