Polypropylene Pipes Manufacturing

Polypropylene Pipes (PP) pipes and PPR pipes are manufactured by extrusion in the same way as PE pipes. Particularly in the case of PP pipes there are several different molecular structures available on the market. In the simplest case the molecular chain is built up of one and the same repeating unit often the same as the monomer shown within the brackets). The polymer is then called homo-polymer. If instead the molecular chain is built up of two different repeating units( A and B) the polymers  is called co-polymer. In the case of PP the homo-polymer, often designated to PP-h, the repeating unit A is the monomer propylene. In PP co-polymers, designated to PP-c, the unit B is the monomer ethylene. Dependent on how the repeating units A and B are arranged in the molecular chain, distinction is made between alternating, co-polymers, block co-polymer and random co-polymers. In the later case the co-polymer is built up at random by the units A and B.
Industrial Filters
The stiffness of the PP pipe will decline in the order: PP-h-PP-b-PP-r and consequently the impact strength will increase simultaneous. It has also been found that the long-term strength at elevated temperature: (600 C ) will increase when going from PP-h to PP-r most commonly used for PP sewer pipes and for cold water pipes id PP-b . Particularly for sewer pipe purpose new high molecular weight resins have been developed recently. The melt flow rate expressed as MFR 230/2 may be in the range of 0.3g/10min. This value corresponds approximately to 0.6 expressed as MFR 190/5 normally used for PE. The most significant property for these new PP grades from a practical point of view as far as buried pipes is concerned, is the rather high short term E- modulus; i.e. Approximately 50% above corresponding values for the most common PE grades. The density of the PP compound is lower than for corresponding PE resins, or approximately900kg/m3 as compared with 950-960kg/m3 for PE. The designation for these polyethylene resins is PP 80.
Industrial Strainers
By improvement of PP-r grades high temperature resistant hot tap water pipes have been introduced recently. They can compete with PEX and PB for many hot water applications, but are easier to process than PEX and safer than PB as far as strength reproducibility is concerned. Furthermore, the PP pipes can be jointed by welding , which is not the case with PEX.

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