Cover or enclose for book, has side piece and one of side piece has double layer bar, where first side and second side is formed by double wall type halves of material web

摘要

Cover or enclose has side piece and one of the side piece has double layer bar, where the first side and the second side is formed by double wall type halves of material web (14). Further both the side pieces are made of a single wall type half of material web. The double wall types of material web and single wall type half of material web are arranged at a distance from each other about spacing. The gap between the first of both the layers of the double layer bar and single wall types halves of material web is bridged by first material web and the gap between the second of both the layers of the double layer bar and single wall types half of material web is bridged by an other material web. Independent claims are included for following: (1) Device for production of cover; and (2) Method for production of cover or enclose for a book.