Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
New technology for in line manufacturing of biaxially oriented poly(vinyl chloride) pipes
Oriented poly(vinyl chloride) pipes have been produced since 1974 and have demonstrated performance characteristics superior to standard poly(vinyl chloride). Molecular orientation enhances tensile strength in the orientation direction, allows higher design stress ratings and material savings, and confers improved resistance to crack initiation and propagation. To achieve circumferential orientation for pressure pipes, an extruded feedstock is stretched diametrally under carefully controlled temperature conditions. Hitherto this has been performed as a secondary 'off line' process in an external mould. The drawback of this process is its high cost. In a joint development programme between Uponor BV and Vinidex Tubemakers, a process has been developed to execute the orientation process 'in line' with the extrusion. The process operates at normal extrusion speeds, requires little energy input, and much lower capital cost. The development work is described together with extensive evaluation testing of the product.
New technology for in line manufacturing of biaxially oriented poly(vinyl chloride) pipes
Oriented poly(vinyl chloride) pipes have been produced since 1974 and have demonstrated performance characteristics superior to standard poly(vinyl chloride). Molecular orientation enhances tensile strength in the orientation direction, allows higher design stress ratings and material savings, and confers improved resistance to crack initiation and propagation. To achieve circumferential orientation for pressure pipes, an extruded feedstock is stretched diametrally under carefully controlled temperature conditions. Hitherto this has been performed as a secondary 'off line' process in an external mould. The drawback of this process is its high cost. In a joint development programme between Uponor BV and Vinidex Tubemakers, a process has been developed to execute the orientation process 'in line' with the extrusion. The process operates at normal extrusion speeds, requires little energy input, and much lower capital cost. The development work is described together with extensive evaluation testing of the product.
New technology for in line manufacturing of biaxially oriented poly(vinyl chloride) pipes
Neue Technologie für Reihenfertigung von biaxial orientierten Polyvinylchlorid-Rohren
Chapman, P.G. (Autor:in) / Agren, L. (Autor:in)
1998
8 Seiten, 10 Bilder, 15 Quellen
Aufsatz (Konferenz)
Englisch
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