1. Different raw materials: PVC raw material is PVC, PPR raw material is polypropylene III, and PE raw material is polyethylene.

2. Different bending degrees: PVC can't bend, and PPR can bend 20 times the pipe diameter.

3, different uses: PVC pipe fittings with the same material are connected with glue, which are mostly used for drainage pipes. PPR homogeneous pipe fittings, hot welded, can be used for hot and cold water supply pipelines. PE has a large caliber and is used for cold water supply pipes.

Extended data:

The production process of PP-R pipe is extrusion molding process. Firstly, the PP-R raw material in the hopper enters the extruder by its own weight, is heated and extruded and mixed in the extruder barrel, and is fully plasticized and then extruded from the extruder head to enter the forming table. The sizing tube is pulled by tractor, fixed length is determined, cut by cutter, and put into storage after inspection. The corresponding pipe fittings are produced by injection molding.

Tubing production process: PP-R raw materials → vacuum suction → hopper storage → feeding → extrusion molding → cooling setting → traction → cutting → inspection → warehousing Tubing production process: PP-R raw materials → conveying and feeding → hopper storage → heating and melting → extrusion injection molding → cooling setting → mold opening → inspection → warehousing.

Tube extrusion parameters: screw speed 5 ~ 38r/min, barrel temperature distribution 1 ~ 2 zone 180 ~ 190℃ 3 ~ 4 zone 200 ~ 2 10℃ die temperature 200℃ traction speed 2 ~ 20m/min.

(1) temperature distribution in the back of barrel 160 ~ 170℃ in the middle and 200 ~ 230℃ in the front 180 ~ 200℃.

(2) Nozzle 170 ~ 190℃

(3) The defective products produced in the production process of PP-R pipe at 40 ~ 80℃ can be reused after being crushed, which improves the utilization rate of raw materials, reduces the production cost and improves the economic benefits.

References:

Baidu encyclopedia -PPR