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Dowell Materials > Molding Conditions
Molding Conditions and Trouble Shootings
Basically, there are two kinds of plastic, thermoplastic and thermosetting plastic. To perform molding for these two types of plastic, different machines has to be used. And it will need two different molding conditions and manual to operate the thermoplastic and thermosetting injection machine.
We have prepared the molding conditions for some of the thermosetting and thermoplastic molding compound for your reference.
Molding Condition for Phenolic Molding Compound
- Machine used: Thermosetting injection molding machine
- Chang Chun Phenolic Molding Compound.
Flow
Weight (g) / Shot
Mold Temperature
Cylinder Temperature Screw Revolution Front Rear Stiff - Medium under 300 160-180oC 85-95oC 60-80oC 40-60 rpm Soft above 300 165-190oC 85-95oC 55-75oC 40-60 rpm Curing Time: Allow 6-10 seconds per 1 mm of molding thickness - Sumidurez Phenolid Molding Compound
Parameter Suggested Range Mold Surface Temperature Fixed 170 - 190 oC Movable 170 - 190 oC Barrel Temperature Front 85-95 oC Back 40-50 oC Material Purge Temperature 100 - 110 oC Injection Pressure 1000 - 1500 kgf/cm2 Back Pressure 5 - 20 kgf/cm2 Screw Speed 40 - 80 rpm Curing Time (per 1 mm molding thickness) 6 - 10 Seconds - Molding Conditions for PBT molding compound
Machine used: Thermoplastic injection molding machine
- Chang Chun PBT molding compound (2000 - 4000 Series)
Parameter 2000 Series 3000 Series 4000 Series Barrel Temperature (oC) Rear 230-235 230-240 230-245 Middle 240-245 20-250 240-260 Front 245-255 250-260 255-270 Nozzle 245-250 250-255 255-270 Mold Temperature ( oC ) 20-70 30-80 30-80 Injection Speed Medium Medium-Fast Medium-Fast Injection Pressure (kg/cm2)
Injection Pressure 500-1000 500-1200 500-1200 Second Pressure 300-700 300-800 300-800 Back Pressure 0-3 0-3 0-3 Screw speed (rpm) 60-120 60-100 60-100 If you are experiencing difficulty during the molding process, here are some Troubleshooting which may help you in a flash. Back to top 
