| 摘要 |
The invention is a method and apparatus for making conduit for use in leachi ng systems, and the conduit produced thereby. The conduit has apertures created during i ts formation. The apertures are not cut from the material of the conduit. The material that is perforated is "rolled", and made a part of the inner surface of the conduit. Included is at least on e perforator that is actuatable. The conduit-forming material being perforated (typically a plast ic- type material) is semi-molten, as during formation of the conduit, or after formation of the conduit by heating the perforator, thereby causing the conduit-forming material to be rolled rather than cut in creating a perforation. The apparatus has at least one actuatable perforator or at leas t one multi-tipped sequentially actuatable perforator located in at least one of a plurality of conduit-forming molds. Each of the molds has first and second "mold-halves" which are advanced together in an open position, and then closed, creating a cavity wherein molten conduit-forming material is injected. After injection, the mold body formed by the closed mold halves continues to advance, and while the conduit-forming material is still semi-molten the at least one perforato r is activated, thereby forming a perforation into the soft conduit before the material has complete ly hardened. The perforator tip portion(s) is then withdrawn, leaving a perforation of predetermined geometry and dimension, and having "inwardly rolled" edges. When the conduit is "set", th e mold-halves are opened, allowing the conduit, having apertures therein, to be removed and th e now-open mold halves to return to the beginning of the cycle to be closed again and accept new molten conduit- forming material. Thus, there is a continuous cycle of conduit formation, using the same mold halves. The conduit produced is distinguishable from similar conduit because the perforations are not "cut out" but are created by rolling the material inwardly, thereby improving strength and enhancing functioning of the conduit.
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