Лако-красочные материалы — производство

In unsewn binding, adhesives are needed not only for the bonding ofthe back, but also for gluing the side of the cover to fix it on the first page (side glues). To this end, either dispersion adhesives or hot melts can be employed. Dispersion adhesives used for side gluing are commonly based on plasticized polyvinyl […]

For process improvement in unsewn binding, two or rarely three different adhesives can be applied one after the other (multilayer binding) [41]. Here, one popular technique is the so-called ‘two-shot system’, which uses two adhesives. The applica­tion of two different dispersions for primer and topcoat has a long tradition; they are frequently derived from the […]

In the 1980s, the development of reactive polyurethane hot-melt adhesives for unsewn binding was an important innovation for the graphics industry and enabled the print finishers to use unsewn binding techniques for products that hitherto had been ‘impossible to bond’ [40]. Reactive polyurethane hot melts are the adhesive of choice whenever using papers that are […]

Hot melts have gained ground because they provide for high production speeds. EVA copolymer-based hot melts are commonly used for the unsewn binding of magazines and catalogs, although other thermoplastic polymers are also used on occasion. In order to adjust the hot melts to specific properties they are mixed with resins and waxes. As with […]

The dispersion adhesives used for unsewn binding are commonly based on plasti­cized polyvinyl homopolymers. They are used, for example, when excellent lay-flat behavior is required, or when the risk of printing inks influencing the bond is very high. They are usually applied via rollers. Dispersion adhesives set by absorption or evaporation of water; however, as […]

In terms of quantity, the most important application in the graphic industry is that of unsewn binding (‘perfect binding’) by means of dispersion adhesives, thermoplastic hot melts, or reactive polyurethane hot melts, depending on the requirements [38]. Previously, animal glue protein was used in this role, but is no longer important in unsewn binding. The […]

Products of the print finishing and bookbinding industries have become an integral part of our daily life, and today life without them is simply inconceivable. Books, catalogs, magazines and other graphic products such as advertising mail fulfill our need for information. This situation becomes even more obvious from the fact that, despite the presence ofcomputers […]

Tail tie adhesives bond tissue paper to tissue paper in order to prevent unwinding during transportation to the packager. They are designed to rapidly wet the paper, to penetrate many tissue plies, and to hold the last sheet securely in place on the roll through the cutting process. Tail tie adhesives also enable the consumer […]

Pick-up adhesives, which sometimes are referred to as ‘transfer adhesives’, start the laminated tissue paper winding onto the paper core. To provide for reliable transfer at high line speeds, they are designed to have a high wet bonding capacity and good processability. Furthermore, they stain neither the core nor the tissue, and are designed to […]

The lamination process (ply bonding) is crucial for the quality of the finished tissue product. Lamination adhesives join two or three (or even more) tissue plies together. There are several ways in which the plies of embossed products are brought together; one way is to apply the adhesive to the tips of the raised elements […]