Polyurethane Short fibres

E Polyurethane Roving for thermoplastics - short-fibre moulding compounds (e.g. nylon)... 

RRIM machines can handle fibre-filled systems with viscosities up to 6000m Pas, which is much higher than the conventional RIM material viscosities of up to only 2000 m Pa s. The limitation to the present RRIM technology is that the process is only successful for milled glass of 0-8-6 mm screen size (average filament length of 01-0-3 mm and approximate filament diameter 0-01 mm) or other short fillers. Comparative properties of RRIM versus other structural materials are shown in Table 6.7 and a comparison of RIM versus RRIM polyurethanes is given in Table 6.8. This makes it possible to identify the features of RIM and RRIM urethanes,... 

RRIM polyurethanes are an extension to Reaction Injection Moulding (RIM) which is a relatively recent, but now established, plastics processing technique. Simplified, RRIM is the inclusion of a reinforcement - short glass fibres - into one of the components used in the RIM process. However, the inclusion of glass reinforcement into one of the reactive components, usually the polyol, has meant that certain processing equipment modifications were necessary in order to handle the... 

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