The glue container may be too full so that the scraper gets dirty at the backside. A good scraper and the correct supply (may be automatic filling) are important. It could also be that the glue is not designed for wheel applications. Please refer to the technical or application datasheet of your adhesive.
With my wheel application, I notice that an excessive amount of glue is used, how can I reduce the adhesive consumption?
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Carton manufacturing