 Cover
Material Development
Over the last 2 years, RHL has concentrated its R & D efforts on
the development and improvement of conventional supercalender roll cover
materials.
Working in conjunction with the University of Manchester (U.M.I.S.T.)
and the world's manufacturers of calender roll paper, significant improvements
in cover material quality have been made.
As a result of this research, RHL today have a better understanding
of the ideal specification of supercalender roll paper than ever before.
RHL are now demanding an improved specification of cover material from
all their suppliers. The improved specification of material is now in
use for all RHL's conventional supercalender roll recovering.
This R & D project was undertaken in response to the increasingly
demanding conditions of today's supercalenders. An approximate trend
in the world today is that paper mills are attempting to increase production
volume through their supercalenders. This increase in speed often requires
compensating increases in line pressure and temperature in the supercalender
in order to maintain paper quality. These increases represent more demanding
running conditions for the rolls and improvement in the performance
of the rolls was a logical goal for RHL.
RHL's improved cover materials are keeping pace with progress in the
supercalendering industry, enabling increased running conditions and
improved roll performance and life.
RHL's current experience of the supercalendering industry is that conventional
cotton supercalender rolls are enjoying something of a renaissance.
Over the last ten years many new technologies have been trialled with
mixed results. The present trend represents a realisation that cotton
rolls continue to offer the most cost effective solution for the majority
of supercalendering applications.
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