End of Stone Age, 2016 International Mechanical Pulping (IMPC) Conference

Name “Pulp stone” has served for 150 years as a description for the central process element of GW and PGW machines. This name also describes the element very well because it is primarily made of concrete and other “stony” materials. For decades, there has been a need to bring to market a replacement for pulp stone technology as it has been a major limiting factor for GW and PGW technology development.

Long term research has been focused on the alternatives which can be described as single layer grinding surfaces (SLGS). After several years of basic research and product development, an alternative and replacement for pulp stones has now been launched. Valmet has brought new grinding technology to the market, which can be integrated with the existing PGW and GW machines. This technology is based on an all-steel construction and replaceable steel segments with only one layer of high quality industrial diamonds on top of them. These facts makes it possible to say that “Stone Age” grinding technology is finally over. This new mechanical defibration technology is named “Galileo technology”. It will be referred to as single layer grinding surface (SLGS) later in the paper. 

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