| 摘要 |
<p>PURPOSE:To form a joint easily and integrally in a rigid and uniform manner by a method wherein two or more members formed from olefinic polymers are joined together and such a joint is covered or sealed with the norbornene resins obtained by reactive injection molding. CONSTITUTION:When a butt joint is formed between two polyethylene pipes 1, the outer peripheral faces of their ends are sandpapered and cleaned with methanol to remove residue and fat and oil therefrom and thereafter the pipe ends are aligned. After the pipe connecting part is sealed with a cloth-made pressure-sensitive adhesive tape 2, the connecting part is secured by two-piece dies 3a and 3b which are fastened together with bolts. Two reactive raw liquids are sent into a mixing chamber by using a gear pump to impinge the liquids against each other so as to mix them together and the resin mixture thus obtained (norbornene resin) is injected from an injection opening 4 and filled in a spacing 11 between the dies 3a and 3b. After the resin hardening, the dies 3a and 3b are taken apart and burrs are removed, thereby completing the joining operation.</p> |
