PURGING COMPOUNDS | PROCESSING


stubborn burnt-on resins as effectively as glass fibres but there is no risk of agglomeration. In addition, because the mineral has a particle size of 45 microns (345 mesh) the purging compound grades are safe for use with screen packs.


Strong demand Strong market demand for purging compounds is also reported by Asahi Kasei Asaclean Americas. “While the pandemic brought some expected slowdowns in the automotive and aerospace market, we have more than made up for that in the medical, packaging and consumer goods markets,” says Phani Nagaraj, Vice-President. “From compounders, end-users are increasingly looking for more complicated resins that meet certain end-product qualifications. Many suppliers need additives, colorants and fillers that complicate the cleaning process. Many of these additives and resins have properties that lead them to burn more easily, causing carbon contamination/black specks. This puts a premium on purging compounds that are easy to use, clean better than what was needed before, and are easy to displace,” he says. Nagaraj says that Asaclean’s main area of


interest is addressing difficult applications that do not have effective solutions already available on the market. The company recently introduced Asaclean PLUS Grade, which is a purging concen- trate that boosts the compounder’s own processing resin to enable it to clean the extruder more effectively. In extrusion processes PLUS is claimed to excel in low-flow/low pressure environments. It is said to effectively fill and clean out the die and is particu-


Above: Twin screw extruders often run formulations that are


challenging to clean


Discover our Black FCP NIR sortable range of Pigments for plastics in contact with food


pNUBIFER NB-803K FCP PBk33 - Manganese Ferrite Black Oxide


p24-3950 FCP IR BLACK PBr29 - Chrome Iron Brown Hematite


FDA APPROVED - 21 CFR 178.3297 Maximum ≤5% by weight in all type of food contact polymers


IMAGE: ASACLEAN


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