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Technical developments The industry has adopted fluted paper filtration cartridge systems in preference to flat paper or flat fluted systems due to the lack of space in process environments. It has proved cheaper to increase the density of filter medium in a confined space than to expand the size of the filtration surface. The use of replaceable cartridges also improves service conditions, making it easier to access the filters and replace them. This is truer of wet filtration systems in the dairy industry, water purification plants and paint booth operators.
Thermo coatings are a mix of colourless leuco dye, stabiliser, developer, adhesive, clay and binder. Varying these ingredients can alter paper performance. A top coating can change the static sensitivity (resistance to heat) but can change the dynamic thermal response, which adds to cost. Most thermal paper can work up to 60°C but specialty grades have been developed that can withstand up to 100°C. Page 35 © Copyright Pira International Ltd 2006 Developments in Specialty Papers Selected specialty grades Image durability A disadvantage of direct thermal paper is that exposure to UV light causes fading.
Direct thermal paper enjoyed a revival in the mid 1990s from non-office uses such as labels, air tickets, receipts, tags, admission tickets, fast-food receipts, courier labels, manufacturer labels and automatic teller printouts, still on a roll but in a narrower paper format. The driving force behind the growth of thermal paper is the thermal printer. It offers several advantages, including compact design, robust and simple technology, constant image quality, adequate speed, reliable and proven operation, simple loading and paper feed, complete flexibility and mobility.