Raw material + color masterbatch → mixing → vacuum feeding → raw material drying → single screw extruder → color line extruder → spiral mold → sizing sleeve → spray vacuum setting box → spray cooling water tank → inkjet printer → Crawler tractor → finished product inspection packaging PPR pipe specifications.
Ppr pipe PPR pipe specification pipe series S, nominal outer diameter dn × nominal wall thickness en
Example: PPR pipe series S5, PPR nominal outer diameter dn25mm, PPR nominal wall thickness en2.5mm
Expressed as S5, dn25×en2.5mm
PPR pipe series S: is a dimensionless numerical series used to indicate the specification of ppr pipe, with the following relationship S = (dn-en) / 2 en
Where: dn - PPR nominal outer diameter, in mm
En——PPR nominal wall thickness in mm
Commonly used PP-R pipe specifications are 5, 4, 3.2, 2.5, 2 five series
PPR pipe specifications PPR pipes are divided into five series of 11, 9, 7.4, 6, and 5 according to the standard size ratio SDR value.
PPR pipe specification PPR standard size ratio SDR: is the ratio of the nominal outer diameter dn of the PPR pipe to the nominal wall thickness en.
The relationship between the PPR pipe specification SDR and the PPR pipe series is as follows: SDR=2S+1
Representation of PPR pipe fitting specifications:
The nominal outer diameter dn of the PPR pipe is the nominal outer diameter of the PPR pipe connected to the PPR pipe. The wall thickness of the PPR pipe is not to be less than the wall thickness of the PPR pipe of the same PPR pipe series S.
Most of the company's PPR pipe fittings only have the highest standard S2 series, all trials of hot and cold water.
PPR pipe specification S5 series --------------1.25 MPa (12.5 kg)
PPR pipe specification S4 series -------------- 1.6 MPa (16 kg)
PPR pipe specification S3.2 series ------------ 2.0 MPa (20 kg)
PPR pipe specification S2 series -------------- 2.5 MPa (25 kg)
Industrial production process
Traditionally, the most representative of the three manufacturing processes has been used to produce polypropylene. Hydrocarbon slurry or suspension A liquid inert inert diluent used in the reactor to transfer propylene to the catalyst, heat removed from the system, deactivated/removed catalyst, and dissolved atactic polymer. The range in which the grades can be produced is very limited. (This technology is no longer used).
Bulk (or large amount of pulp): An inert hydrocarbon diluent that uses liquid propylene instead of liquid. The polymer is insoluble in the diluent but rides in liquid propylene. The formed polymer was withdrawn and any unreacted monomer was flashed off.
Gas phase: The use of gaseous propylene in contact with a solid catalyst results in a fluidized bed medium.
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