Electrofusion (EF) fittings are used in the joining of polyethylene (PE) gas pipes. However, the cost of fittings for large diameter pipes is high compared with that for small diameter pipes. Accordingly, a multilayer moulding method has been developed, with the aim of reducing the cost of EF fitting for large diameter pipes. In this method, the wall thickness of the fitting is divided into a number of stages (injections). Hence the wall part formed at each stage is thinner, allowing a reduction of the time required for cooling inside the mould. In this way, production efficiency of fitting could be increased. The method involves the formation of a resin layer at each injection, which leads to concerns regarding the reliability of the adhesive strength between layers. From tensile tests and the full notch creep test carried out on the part between resin layers, it has beenveri fied that performance is the same as that for a single layer article.
Multilayer moulding technology for electrofusion fittings
Mehrschicht-Spritzgiesstechnologie für Elektrofusions-Rohrverbindungen
1998
6 Seiten, 10 Bilder, 4 Tabellen, 3 Quellen
Aufsatz (Konferenz)
Englisch
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