Polyurethane chemistry for paper-making manufacturer
A challenge from the paper manufacturer to the Notedome technical staff was to increase the polyurethane strength of the stirrer allowing it to manage the intensive high-temperature mixing process. This stirrer is used by an innovative paper manufacturer with their impellor, to grind a composite of minerals and plant-cellulose, adding natural strength and quality to the paper and cardboard, enhancing the characteristics of the finished product. The elastomer engineering company who cast the impellor used Notedome’s Neuthane™ 801 to give excellent visible aesthetic value with little abrasion wear, plus fast cycle production times.
Neuthane™ 801ISO NG's tensile strength was an important factor in its choice. Neuthane™ 801NG and the catalyst 055 were tailored by Notedome’s technicians to be used in the moulding machines for this casting, allowing the production to be at optimum levels. Before using the new formulation quality issues were experienced, but with Neuthane™ 801ISO NG, they have an improved-looking casting and improved abrasion resistance.
Solution for South West Metallurgical Services
South West Metallurgical Services based near Penzance Cornwall (UK) design, manufacture and supply Spiral Concentrators to the coal, mineral and environmental industries. They were looking for a hand-mixable cast polyurethane, Shore A 86, for the high wear components of their Spiral Concentrator.
Spiral wear components are required to withstand a continuous flow of highly aggressive slurries 24 hours a day, seven days a week, over many years of service. SWMS are using high-performance Neuthane™ 801NG – A quasi PTMEG polyether-based MDI system for their Spiral Concentrators. Rob Davies of SWMS says, “We are using the Neuthane™ 801 NG system with the CAT044 catalyst and find that at 35 – 40°C material temperature and 75 – 80°C mould temperature we can pour any of our moulds, and get the required physical properties. Pot life is 8 – 12 min and demould time about 50 minutes – increasing the material temperature from 30°C has helped with mixing, de-gassing and pouring”. Rob added – “We are very pleased with how the Neuthane™ 801NG system has worked and its resistance to the aggressive slurries.”
