| 摘要 |
A binder has a spine (3) which is provided with housings (9) for receiving rods 13 and articulated to covers provided on both sides with a PVC foil. The housings (9) comprises a flat base (10) integral with a perforated portion (11), moulded from a rigid synthetics material which may be welded by ultrasonics. The spine 3 is made of the same material as that of the housings 9. A cut-out section is provided in the PVC foil of the internal face of the spine 3 at locations receiving the housings 9 which are welded to the spine at the cut-out sections by ultrasonics. The spine and housings may be made of polypropylene. <IMAGE> |
