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Industrial filters Paper filters are a traditional medium for air-conditioning systems. Applications tend to have increasing temperature requirements, so paper systems are approaching their technical limits. Non-woven polyester in Europe and fibreglass in the US compete strongly with paper in the low-cost segment. In higher-temperature segments, paper is unable to compete with Teflon or Aramid. Most development is in fibre technology to optimise particle capture and extend the life of filters. The industry is mainly concerned with depth filter systems where paper can play a role but membrane technology is also used in wet process systems, which are unsuitable for paper.
Retailers’ emphasis on lower primary pack weight is a double-edged sword. The outer carton typically has to be reinforced to accommodate the weaker walls of the flexible paper wrap, so there is a shift in emphasis towards less primary packaging but more corrugated board. Much recent development has been in the use of integrated packaging design to match the primary pack with a display stiffener within a larger transport pack. Tea bags For export, tea is packed in large natural fibre bags, while for retail it is packed in tea bags or as loose tea in a pouch, with a small outer carton.
This would not be acceptable in price tags for example, so pre-printed thermal transfer tags are used. A top coating of UV filter can increase the life of the paper by months. Thermal paper is not just sensitive to fading, but also to oils, plasticisers, alcohol and moisture. The main improvements have been in coatings to offer UV and thermal resistance, not in the paper substrate. Multicolour capability Direct thermal printing cannot be done in colour without a donor and receptor. The first dual-colour PoS receipt printer was introduced in the US in 2001 and several printer manufacturers now offer it.
Advances in Specialty Papers by Pira International Ltd