| 摘要 |
<p>The aim of the invention is to simplify the production of books with rounded book blocks. According to the invention, a UV-reactive hot-melt-type adhesive on the basis of a humidity-cross-linking polyurethane is used for the in-line binding of book blocks after the adhesive has been applied. The adhesives to be used contain olefinically unsaturated double bonds, such as present in the derivatives of acrylic acid or styrene for instance, and NCO groups. The processing conditions for the binding have to be chosen in such a way that said conditions result in characteristics in the following areas when a corresponding adhesive film is used: expansion > 100 %, yield stress > 0.5 N/mm2 and preferably tearing strength > 1N/mm2.</p> |
