Effect of tableting conditions on the sticking of tablet using ibuprofen

Influence of tableting conditions on sticking was investigated using two formulations, the one formulation containing ibuprofen (formulation A) and the other being the standard formulation (formulation B). Sticking was observed on formulation A, and was not observed on formulation B. The degree of sticking was decreased with increase in compression pressure, and increased with compression speed. The shape of punch face was influenced the degree of sticking (sugar concave < bebel < flat). It was thought that sticking was observed when the adhesion between tablet and punch was larger than that among tableting granules. We investigated the pressure placed on a scraper (SCR), the adhesion between granules and metal, and boring hardness of tablet. The results showed that sticking was not observed when the SCR and/or the adhesion were small enough or boring hardness of tablet was high enough. Furthermore, it was suggested that boring hardness distribution would influence sticking.