Impact performance Plastic pipelines may encounter external impact loads during transportation, use, and especially construction and installation. The evaluation methods of impact resistance are mainly the drop hammer impact of the pipe, the simple supported beam impact, and the drop test of the pipe fittings. The problem of PVC-U drainage pipes is the most prominent in the drop hammer impact test. In addition to the unreasonable formula and low processing level, the main reason is that the filler is filled too much. This has been a legacy of such products.
In recent years, new drainage products such as core foam pipes, inner wall spiral pipes, and corrugated pipes have occupied a considerable portion of the market share with their respective characteristics. In this type of light-structure wall pipes, the body strength of the foam layer of the core foam pipe is relatively low The angle between the convex structure of the spiral tube and the corrugated tube and the wall of the tube is likely to form stress concentration when subjected to impact. The structure of the wall tube of the same raw material formula is broken when the ordinary solid wall tube is intact, so the structural wall tube In addition to a reasonable structural design, the material should also be more demanding than solid-walled tubes, so light-structured walled tubes cannot be understood unilaterally as a cost reduction.
The impact of simply supported beams is currently only for PP pipes. Among them, PPR and PPB pipes are hot products. Due to fierce competition, it is often the case that homopolymerized PP resins are used in the name of copolymerized PP pipes or low-level physical blending modified materials. It was found in the arbitration inspection and supervision and random inspection of engineering quality disputes, which was reflected in the crack of the simply supported beam conditional impact test.
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