The term 'converting' is in widespread use yet there is no general agreement on its precise definition and scope. The converting industry is notoriously diffuse, encompassing wide web coating operations in paper and plastics packaging, trimming, sheeting and the intricate details of high quality bound book production. A bewildering array of jargon is in use, much of it based on customs and practices passed down for several generations and, increasingly, on new terms originating from the USA or mainland Europe. This book aims to satisfy the wishes of many converters for a standard reference work which can be used for education and as an aid to communication. The dictionary gives definitions of terms which may be encountered in any of the diverse group of technologies that is included under the general heading 'converting' which is defined as 'the process of transforming one or more preformed raw materials, usually in web or sheet form, to a state suitable for end use or further processing'. Thus both calendering and coating are included but only with reference to operations which are carried out separately from the paper machine, otherwise known as 'off-machine processes'. Also in­ cluded are methods of production of cartons, books, finished and coated papers, boards and laminates, and many other items of relevance to the paper and board, film, laminating, packaging and allied industries.