Attrition and abrasion resistance of particles coated with pre-mixed polymer coating systems

Nowadays many particulate products are coated to avoid dust formation and breakage when subjected to forces with different magnitude and direction. In order to distinguish the influence of each force, different testers are needed. In this work Purox-S and Cellets 1000 core particles were coated in a top spray fluid bed coater by three different pre-mixed polymer coating systems (Opadry®, Kollicoat® IR and Instacoat AQUA). The repeated impact tester (RIT) was used to measure their strength toward attrition caused by low magnitude normal forces. Tangential forces may also cause rupture to the particles, so an abrasion tester was used to measure this amount of damage caused to the particles. This work provides information on the resistance of the core particles coated with different mixed polymers against attrition and abrasion.

Higher the frequency of the arm and the box of the abrasion tester is higher the abrasion rate. This leads to stronger force pushing the particles toward the wall of the box resulting in higher damage on the coating. Similarly the higher the rotation frequency of the particle box, the faster the removal of the sharp edges on the surface.Figure optionsDownload as PowerPoint slideHighlights
► Higher the frequency of the main arm and the box higher the abrasion rate.
► Rotation frequency of the box is directly related to the removal of sharp edges.
► Abrasion follows the same trend as attrition in terms of transferred energy.
► None of the premixed coatings tested shows failure when applied on Cellets 1000.