| 摘要 |
A ring binder and method of making the same. According to a preferred embodiment, the ring binder includes a front cover stiffening member (13-1), a spine stiffening member (13-2) and a rear cover stiffening member (13-3), all of which are appropriately positioned between a matching pair of woven sheets (15-1, 15-2). The woven sheets are made of a synthetic fiber or thread, such as polyvinyl chloride, polypropylene, polyethylene, nylon, orlon, rayon and combinations thereof, that is ultrasonically weldable. The woven sheets are ultrasonically welded together around their respective peripheries and on opposite sides of the spine stiffening member to define, together with three stiffening members, a front cover, a spine and a rear cover. The binder further includes a paper-retaining ring mechanism (21), which is secured to the spine or to one of the front or rear covers.
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