Pulverization of PP Copolymer without any cooling nitrogen

For the first time pulverization of the difficult-to-pulverize PP copolymer is possible without the addition of nitrogen as a cooling agent. The PolyGrinder pulverizing system, type PKMM accomplishes this task under ambient temperature. A more economical pulverization and the protection of important resources are the result. The quality requirements of the powder so-produced with regards to particle size distribution, flowability and bulk density are completely met.

In the rotomoulding markets, new applications, end products and materials are increasingly in demand. The PP Copolymer is a result of these efforts. This type of material is used during the production of parts which must perform their services under difficult conditions. Parts made of PP Copolymer are mire impact-resistant in extreme cold conditions, very heat-resistant and dimensionally stable.

These characteristics allow them to be used in vehicle engine compartments and during the manufacture of pressure containers. These moulded parts are also optimally suited for utilization in extreme climatic conditions or for installation below ground level.

In order to produce these products in the rotomoulding process, the PP Copolymer must first be pulverized. Only the production of a high quality powder allows for a defined distribution in rotational moulds. Pallmann, in close cooperation with its customers, optimized a process to prepare this difficult-to-pulverize material, without the addition of liquid nitrogen

Pulverization is performed under ambient temperature. The pulverizing system, type PKMM thereby achieves a high and continuous throughput rate. The evaluation of the results from these trials and comparisons between powder quality, capacity and energy consumption attest the efficiency of the Pallmann process when compared to established cryogenic grinding process. Similar good results are also achieved when pulverizing materials such as PS, PMMA, PC and polyester.