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    • 8. 发明申请
    • MULTILAYER PIPES OF RECYCLED MICRONIZED PVC AND PROCESS OF OBTAINING THE SAME
    • WO2019035728A3
    • 2019-02-21
    • PCT/RO2018/000015
    • 2018-08-14
    • PETRI ZOSIN, Sergiu
    • PETRI ZOSIN, Sergiu
    • B29C48/00B29C48/09B29C48/18B32B1/08B29K27/06B29K105/26
    • The invention relates to micronized recycled PVC multilayer pipes obtained by the extrusion process which are formed of three layers, two of which are densely compact and are placed one on the inside, having a virgin PVC K 64-64 or micronized recycled PVC, the other on the outside of the pipe, having a virgin K-64-68 PVC composition, and a middle layer of lower density, expanded and having a micronized recycled PVC composition, these pipes are used in sewage installations, both inside and outside the buildings, and the invention also relates to the process of obtaining these pipes by extrusion, using manufacturing compositions with different compositions, a composition for the compact layer the density of which ranges between 1.45-1.9 g/cm3 and the other for the expanded layer whose density value is between 0.55-0.9 g/cm3. The compositions are made by means of metering devices for mixing the components, the mixed mixture of the proportions is introduced into the mixer, it is mixed up to a temperature of 110-130°C and then cooled to a temperature of 40-50°C in a cooler. Pipes may have different characteristics necessary and useful for their use, which, for example, but not limited to, -by the value of the flow - by the outer diameter and the annular rigidity - by the thickness of the walls. The admixture of PVC mass gives a thermal stability of PVC (virgin or micronized recycled), better machining, a reduction in pipe weight, a lower price due to reduced cost of raw material based on micronized recycled PVC and a positive impact on the environment by reintroducing micronized recycled PVC into compositions.