Due to variations in screw design, heat efficiency, etc. according to types of facilities, optimal conditions for each facility may differ. Therefore , the optimal temperature conditions for each facility must be taken into consideration depending on extruding pressure, cooling efficiency, changes in MI of the final product, appearances of the final product, etc.

To meet the impact strength and creep strength required for PP-R pipe, R200P has a very low melt index. Therefore special care is required when deciding on adequate extrusion conditions. Because of the low melt index of R200P, extruding pressure can be substantially increased during extrusion and mixing efficiency of Color M/B may be decreased. In addition, because Random PP has a characteristic of cooling down slowly, cooling conditions must be strengthened for achieving normal production speed. Rheology data of PP-R offers much information about the flow of PP under stress.It is also useful in deciding optimal processing conditions. Hyosung is eager to supply detailed rheology data upon customer request.

Recommended processing condition.

ขน Cylinder feeding zone    170 - 180กษ
ขน Cylinder melting zone    190 - 210กษ
ขน Cylinder metering (mixing) zone 190 - 220กษ
ขน Head    210 - 220กษ
ขน Die       210 - 220กษ
ขน Cooling Bath 20 - 50กษ
ขน Linear shrinkage of pipes Total 3%กญ4.5%

The most important factor in Injection moulding of fitting is to secure the optimal mold design for the flow of PP-R resin, which is characterized by very low MI. Excessive stress applied to melted R200P can result in rough surface areas in the final products or otherwise damaged products. Therefore, it is important to apply as less stress as possible at the optimal temperature

ขน Cylinder / Nozzle 200 - 240กษ
ขน Processing Cycle Time above 50sec
ขน Back Pressure Sink Mark should be set so sink marks do not appear
ขน Mold Cooling Temperature 30 - 50กษ
ขน Mold Shrinkage 1.5 - 2.0%