Abstract
The production of compressed materials, such as tablets, is often jeopadized by capping. Special phenomenalistic studies were made of the factors of capping, and the method to prevent capping was devised.
Using a tableting machine and a compression testing instrument, the capping tendency under various compressing and ejecting conditions was studied. As the result of the investigation the following conclusion was reached. Capping occurs mainly within the range of about 3mm from the starting point of ejection. Application of suitable pressure within that range is effective for prevention of capping, and the magnitude of pressure is calculated from the quantity of the wall friction between the compressed material and the die in the ejecting process.
