The most important factor in the area of blowroom and cards is the raw material. A saving of 1% good fibres shows considerable effects, writes Simon Urrutia. At a customer in southern India, the rare opportunity presented itself to carry out a direct comparison of the blowroom and card waste. Running parallel there are a Rieter blowroom and carding section as well as a preparation line from another manufacturer, each with practically the same year of construction and almost the same production rate.