Download PDF by Pira International Ltd: Advances in Specialty Papers

By Pira International Ltd

ISBN-10: 1847358047

ISBN-13: 9781847358042

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Page 27 © Copyright Pira International Ltd 2006 Developments in Specialty Papers Selected specialty grades Technical developments Most media are used more for separation than for filtration and are mostly made in diaphragm format. Some filter makers are experimenting with nano- and ultra-filtration to capture molecule-sized particles. Electrical paper Electrical papers are used in specialty applications such as separator tissues for transformers and capacitors, cable insulation and battery separators.

Paper is traditional in this market as it is a proven technology. A small number of converters supply formed parts to the electrical industry. Electrical insulating paper is a strong, pore free paper. It is impregnated with synthetic resins and made from unbleached kraft pulp. ), salts or acids. Lava stone bars are used on rotor and stator to avoid any metal contamination. Some key requirements for paper in this application are: ᮣ High resistivity ᮣ Water and moisture repellence ᮣ High flexural strength ᮣ High temperature resistance ᮣ Light weight ᮣ Low conductivity ᮣ Low porosity ᮣ Freedom from pinholes ᮣ Uniform calliper.

The trend is away from traditional loose leaf to tea bags. Tea bags are universally made of the same proven materials, namely, wood pulp mixed with abaca fibres and using polypropylene (PP) as a hot-melt binder. Research and development mainly addresses issues such as permeability, wet tear resistance, heat resistance, appearance and texture. The traditional method of tea preparation is to pour boiling water over leaf tea in a teapot and strain out the leaves using a metal mesh or colander filter before serving.

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Advances in Specialty Papers by Pira International Ltd

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