By J. D. Peel (auth.), M. R. Chamberlain, J. F. Bowler (eds.)

The time period 'converting' is in frequent use but there's no common contract on its detailed definition and scope. The changing is notoriously diffuse, encompassing extensive internet coating operations in paper and plastics packaging, trimming, sheeting and the complex information of top of the range sure ebook construction. A bewildering array of jargon is in use, a lot of it according to customs and practices handed down for a number of generations and, more and more, on new phrases originating from the united states or mainland Europe. This ebook goals to meet the needs of many converters for the standard reference paintings which might be used for schooling and as an reduction to conversation. The dictionary provides definitions of phrases that could be encountered in any of the varied staff of applied sciences that's integrated less than the final heading 'converting' that's outlined as 'the technique of reworking a number of preformed uncooked fabrics, frequently in internet or sheet shape, to a nation appropriate for finish use or extra processing'. hence either calendering and coating are integrated yet purely near to operations that are performed individually from the paper computing device, differently referred to as 'off-machine processes'. additionally in­ cluded are tools of creation of cartons, books, complete 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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Core plug A plug used to hold cores which is usually expanded by pneumatic pressure to grip the core and clamped to a through shaft or to stub shafts for shaftless core holding. Depending upon the application, two or more plugs are used (a wide core may need a central plug) and for low torque applications one plug only may be air inflating. Where more than one air inflating core plug is used on a shaft, it is usual to interconnect the plugs by a tube coiled around the shaft such that only one inflating point need be used to blow-up all plugs.

There is a gap between web and applicator roll in the order of 75 ~m, and both rollers are of steel or other non-resilient material. The applicator roll is commonly narrower than web width (cut-back) to leave an uncoated margin on the web. Alternatively, a reduced width backing roller may be used when upward curvature of the web margins leaves uncoated edges. The viscosity required is low, hence the solids content is typically 10%. This is a low speed process suitable for 25 m/min maximum. Dry coat weight control is almost entirely by control of the solids content in the coating mix .

1 Accumulator. e. levelling, to set a gap, or to bring rollers into nip. Many methods are available to adjust rollers, set gaps, or set nip pressure. See eccentric, pneumatic, screw, taper wedge, throw-off Air bars These are used to minimise or eliminate contact between a web and a support member. Air bars are usually tubular and small in diameter, and supplied with compressed air which exits through holes, slots, or porous elements to maintain an air cushion which floats the web clear of the bar.

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