Increasingly more plastics are being produced around the world. For a large part of these plastics, the ultimate goal is to be recycled as effectively and efficiently as possible, particularly in the case of polymers PET, PP, PS, LDPE and HDPE. Not only does the demand for plastics increase every year, but ever stricter regulations and requirements are also being imposed by governments. For businesseconomic reasons, one of the main goals for the recycling business is to efficiently and effectively avoid and keep control of foam. Furthermore, food safety can also be an important issue in the process to avoid and control foam.