By J. D. Peel (auth.), M. R. Chamberlain, J. F. Bowler (eds.)
The time period 'converting' is in common use but there isn't any basic contract on its detailed definition and scope. The changing is notoriously diffuse, encompassing huge net coating operations in paper and plastics packaging, trimming, sheeting and the elaborate information of top of the range certain e-book construction. A bewildering array of jargon is in use, a lot of it in line with customs and practices handed down for a number of generations and, more and more, on new phrases originating from the us or mainland Europe. This ebook goals to fulfill the desires of many converters for the standard reference paintings which are used for schooling and as an reduction to verbal exchange. The dictionary offers definitions of phrases that could be encountered in any of the varied workforce of applied sciences that's incorporated below the overall heading 'converting' that is outlined as 'the strategy of reworking a number of preformed uncooked fabrics, often in internet or sheet shape, to a country appropriate for finish use or extra processing'. therefore either calendering and coating are incorporated yet basically with regards to operations that are conducted individually from the paper computer, in a different way referred to as 'off-machine processes'. additionally in cluded are tools of creation of cartons, books, comprehensive and covered papers, forums and laminates, and plenty of different goods of relevance to the paper and board, movie, laminating, packaging and allied industries.
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The time period 'converting' is in frequent use but there is not any normal contract on its detailed definition and scope. The changing is notoriously diffuse, encompassing extensive net coating operations in paper and plastics packaging, trimming, sheeting and the difficult info of top quality sure ebook creation.
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Extra resources for Dictionary of Converting
11 Extrusion coating. hot melt coating. The slot gap is made to close tolerances. Examples of the uses for this process are polythene coating onto paper or board, and adhesive coating. FEP sleeving See PTFE sleeving. Film A variety of films is used in coating machines and are always measured in thickness terms in microns. Fish eyes Small circular coating defects which have the appearance of fish eyes. See defects. Flexographic printing A printing system using profiled shapes of resilient material, known as sterios, to transfer a measured quantity of ink from a gravure roll to the- paper or film.
E. reduced in face width, to coat a width less than full web width. The cut-back may be the applicator roller, or the backing roller may be cut-back for web materials which will curl upwards at the edges. Dancer roller A roller which is free to move and take up or payout web length. Commonly a dancer roller is pivot mounted and moves through a radius but linear travelling dancer roller systems are also used. A dancer roller is conventionally used in conjunction with a displacement transducer (potentiometer) which applies a correction signal to a drive, or to a brake, seeking to return the dancer roller to its original position.
The air knife creates a mist of coating material which is usually extracted from the coating head and separated out. The air knife process is used almost solely for water-based mixes on paper or board, and is capable of high web speed. Air shaft A through shaft used to support unwind and rewind reels because it is a free-fit in the core and is expanded by air pressure to grip the inside of the core. Various types of core gripping system are used: (a) Popular expanding shaft types use round buttons, continuous slats or rubber pads.