Von Roll USA, Inc.

Electrical stress control measures are an essential component of any high-voltage machine. Von Roll has developed conductive and semi-conductive tapes under the trade names CoronaShield® C and CoronaShield® SC. These tapes can be applied as: External corona protection - within the slot End corona protection - outside the slot

By developing and producing state-of-the-art Cablosam® tapes for the manufacture of fire-resistant cables, Von Roll is making an important contribution to disaster prevention. Our Cablosam® mica products have a worldwide reputation and have been specifically developed for use with our customer’s taping technologies, while complying with the most stringent international standards. Cablosam® tapes are also free from halogens and do not create hazardous fumes. Von Roll offers tape widths from 4mm upwards delivered as pads or cross-wound spools. The tape on a cross-wound spool may be up to 20 km in lenght, depending on the width and dimensions of the spool. Von Roll also offers wires fully taped with Cablosam® tapes according to our customer wishes.

Mica is a mineral raw material with outstanding dielectric, thermal and physical properties. Von Roll developed the technique of converting mica scraps from the mine into mica paper registered under the trade name Samica® based either on muscovite or phlogopite. Samica® is then impregnated with an appropriate bonding resin and heat-pressed to be consolidated into Samicanite® laminates. The various types of paper and the different resins and fillers enable Von Roll to achieve the particular properties of mica paper laminates, which are characterized by excellent, electrical, mechanical and thermal properties. Typical applications include electrical engineering, induction ovens, the automotive industry and the household applications industries such as microwave ovens, hair dryer etc..

Mica mastic is used as a filler in conductor strands of Roebel bars at the points where conductors cross over. The material contains mainly mica powder and epoxy resin.

Von Roll is able to supply an extensive range of top-quality tubes made from Samica® papers, which are impregnated with appropriate resin systems in order to meet the characteristics requested for the specific applications.. The mica tubes can be supplied varnished or unvarnished. We deliver mica cylinders in a very wide range of diameters and lengths, in standard sizes or tailored to customer specifications.

Assuring optimum quality of main wall insulation requires careful selection of micaceous tape and detailed attention to the way the tape is applied and processed. We offer a complete range of resin-rich (RR) main wall insulation tapes and systems under the name Samicatherm® for both conventional and hydrostatic pressing and Filosam® and Samicaflex® for the overhang areas. The advantages of these tapes are that they: » Have high dielectric strength » Resist corona discharge » Can be applied smoothly without creasing » Can be applied by fast-running machines or manually » Have short cutting times