heftad book with soft permar and still for its manufacture

摘要

A soft-cover paperback book comprising a block consisting of a plurality of leaves as well as a soft cover fastened to the block. The back of the block is fastened to a flexible, firm support layer over the entire surface of the back and the soft cover is fastened to said block only at the front and rear cover to the first and the last leaf of the block respectively. Thereby the spine portion of the soft cover is loose from the back of the block, so that the spine portion of the soft cover does not resist opening of the block.