| 摘要 |
<p>In a method of bookbinding arranged ends of superposed sheets 2 are bonded by friction welding to a thermoplastic inner face of a spine of a cover 1 by means of friction heat generated between the thermoplastic inner face of the spine and the arranged ends of the sheets 2. The sheets 2 may be of a thermoplastic resin. A thermoplastic film may be interposed between the inner face of the spine and the arranged ends of the sheets 2, said thermoplastic film optionally being united with flap sheets which are superposed on either both sides or one side of the sheets 2 and, optionally, being united with one or more supporting sheets interposed between the sheets 2.</p> |
