Paperboard materials have many subclass boards for Book Printing and Packaging Printing jobs. Here we would try to introduce the box for folding Box printing jobs.
The boards used for cartons are mainly made on cylinder mould or invertform machines. Only the thinnest boards are made on single and twin wire machines. The two main methods provide many possibilities, as all these boards have a ply structure. All plies may be re-pulped waste as in chipboard. Replacement of the outer ply by better quality pulps gives in succession cream-lined chipboards and second and first quality white-lines chipboards. Duplex boards without any waste pulp are available. Boards made entirely from chemical pulp are produced fro frozen food packaging and other applications where the board must be waxed. The cost of these boards obviously rises with the quality of pulp used.
Where special properties such as moisture resistance or grease resistance are required, coated and laminated boards are employed. These may be wax-laminated where the wax is the moisture barrier, glassine-lined for grease resistance or plastic-coated for special properties, including heat sealing. Paperboard cartons, even if made from plastic-coated boards, unless of special construction, can?．t be expected to give much moisture properties to the contents and are therefore used with inner bags.
The external appearance and the printing quality of carton board are greatly enhanced by the use of coated board. Clay and other mineral are coated on to the lined outer surface of the board. The coating is applied either during the board-making operation or subsequently. A limitation of the boards which are coated on the board-making machine is that the coating must generally be of a somewhat thinner nature and have a less gloosy surface than coatings applied off the machine as a separation. The latter include cast coated boards which have a very high gloss and brightness. In many instances, the extra cost of these boards limits their use to the packaging of comparatively expensive goods, such as cosmetics.
Board Book Printing