Professional Polymer Technology
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Polyurethane or "PUR adhesive" appeared in the late 198 […]
Polyurethane or "PUR adhesive" appeared in the late 1980s and was used in other industries such as furniture and automobiles, and was found to be useful in book binding applications. Its main advantages, lower freezing points and higher melting points have significant advantages, especially for publishers who publish books worldwide. Simply put, PUR is the most durable adhesive that is available for all perfect binding works, regardless of the type of paper or ink used.
Today, PUR adhesives are gaining more and more attention in the marketplace because publishers and consumers want to bundle the pages more securely during the life of the book. In fact, since installing the PUR binding organization three years ago, PG now uses PUR to glue about 40% of books - hardcover and soft book.
PUR adhesives have lower freezing points and higher melting points than any other binder on the market. Books bound by PUR do not fail at extreme temperatures - even if they exceed 200 ° F or -40 ° F. These attributes are particularly important for customers who send books of extreme temperature around the world. The use of standard hot melt adhesive stripes causes considerable wrinkles in the groove area of the book. However, the lower operating temperature of the PUR does not remove paper moisture from the trunk. PUR can also cure, so that the paper fiber to restore the original direction.
Since the PUR is applied over half of the standard thickness of the hot melt, the material is much less likely to accumulate on the trimmer during pruning and covers the material. Since only a small amount of PUR is required for stapling, fewer adhesives are extruded when the capping and side grippers attach the cover and form the back. One of the most important reasons for considering PUR adhesion is cost savings. According to a study in Europe, adhesives can be folded by folding the backbone of the signature, and then blended with PUR to achieve a 30% to 40% cost savings.