INVESTIGATION OF ADHESIVE LAYER THICKNESS DISTRIBUTION OF PERFECT BOUNDED BROCHURES
Perfect binding has become an economically attractive binding method in the last decades, primarily because of its suitability for mass production of low- and mid-range graphic products, but nowadays, due to the constant development of new adhesives, it is gaining on importance in the field of high quality, short-run products too. There are many influencing factors of perfect binding technique regarding the raw materials` basic properties and the application procedure, as well. Besides the paper and its preparation, the used adhesive and its application directly affect the paper/adhesive interface and the adhesive bond strength of the finished products. In this paper, the uniformity of glue application has been analysed to investigate the effect of book block thickness and gluing system set-up (nominal thickness and length) on the adhesive layer thickness distribution along the spine. The obtained results showed that the adhesive layer became more evenly applied to the block spine by increasing the book block thickness and the nominal adhesive thickness too. In the case of glue length set-up, results showed similar tendency of uniform application, but only for the lower set-up values, i.e. by shortening the glue length.