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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

Troubleshooting

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

Troubleshooting

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.
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