Commonly Plastic Injection Molding Process Parameters

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What is Injection Molding Parameters?

Injection molding

Injection molding parameters are the set of controllable variables that govern the injection molding process. These parameters dictate how the molten plastic material is heated, injected, and cooled within the mold to create a finished part. Properly managing these settings ensures consistent quality, efficient production, and minimal defects.

What Are the Commonly Plastic Injection Molding Parameters?

Below is a table of common technical parameters for various plastics. These values are general guidelines and should be optimized for specific applications.

Parameter
Description
Material Name
The type of plastic material used (e.g., ABS, PP, PC).
Melting Temperature
The temperature at which the plastic becomes molten, allowing it to flow into the mold.
Mold Temperature
The optimal temperature of the mold cavity to control cooling and prevent defects.
Injection Temperature
The temperature at which the plastic is injected into the mold cavity.
Drying Temperature
The temperature required to remove moisture from hygroscopic materials like PA or PET before molding.
Drying Time
The duration required for effective moisture removal.
Injection Pressure
The pressure applied to push the molten plastic into the mold.
Holding Pressure
The pressure applied during the solidification phase to reduce shrinkage and maintain shape.
Injection Speed
The rate at which the molten material is injected into the mold.
Screw Rotation Speed
The speed of the screw responsible for melting and mixing the material.
Cooling Time
The time required for the part to cool and solidify inside the mold.
Cycle Time
The total time taken for one complete molding cycle, including injection, cooling, and demolding.
Demolding Temperature
The temperature at which the part can be safely removed from the mold without deformation.
Shrinkage Rate
The percentage of dimensional reduction as the part cools and solidifies.

Injection Molding Parameters of Common Plastics

PP Injection Molding Parameters

Parameter
Description
Drying Temperature(℃)
65~75
Mold Temperature(℃)
35~65
Melt Temperature(℃)
200~250
Injection Pressure(MPa)
130~180
Injection Speed
Medium
Cooling Time(S)
20~60
Drying Time(hr)
0.5~1
Scrap Quantity(mm)
3~10
Back Pressure(MPa)
9~17
Clamping Force(ton/in2)
2
Return Speed (rpm)
60~90
Shrinkage
1-2%

ABS Injection Molding Parameters

Parameter
Description
Drying Temperature(℃)
80
Mold Temperature(℃)
45~80
Melt Temperature(℃)
190~235
Injection Pressure(MPa)
90~140
Injection Speed
Medium
Cooling Time(S)
10~60
Drying Time(hr)
1.5
Scrap Quantity(mm)
2~8
Back Pressure(MPa)
9~18
Clamping Force(ton/in2)
2~2.5
Return Speed (rpm)
70~100
Shrinkage
0.4% to 0.9%

PMMA Injection Molding Parameters

Parameter
Description
Drying Temperature(℃)
80
Mold Temperature(℃)
40~70
Melt Temperature(℃)
215~240
Injection Pressure(MPa)
100~170
Injection Speed
Low
Cooling Time(S)
20~30
Drying Time(hr)
2~3
Scrap Quantity(mm)
2~6
Back Pressure(MPa)
13~28
Clamping Force(ton/in2)
4
Return Speed (rpm)
60~80
Shrinkage
0.2-0.8%

PE Injection Molding Parameters

Parameter
Description
Drying Temperature(℃)
65~75
Mold Temperature(℃)
40~70
Melt Temperature(℃)
180~220
Injection Pressure(MPa)
80~130
Injection Speed
Medium
Cooling Time(S)
10~30
Drying Time(hr)
0.5
Scrap Quantity(mm)
3~10
Back Pressure(MPa)
7~18
Clamping Force(ton/in2)
2
Return Speed (rpm)
60~100
Shrinkage
1.5% to 5%

PVC Injection Molding Parameters

Parameter
Description
Drying Temperature(℃)
Do not dry, if wet, need to dry below 70℃ for 1 hour
Mold Temperature(℃)
30~50
Melt Temperature(℃)
160~185
Injection Pressure(MPa)
70~110
Injection Speed
Low Or Medium
Cooling Time(S)
30~120
Drying Time(hr)
1.5 – 2.5
Scrap Quantity(mm)
2~6
Back Pressure(MPa)
4~8
Clamping Force(ton/in2)
2
Return Speed (rpm)
50~80
Shrinkage
0.2% to 0.5%

PC Injection Molding Parameters

Parameter
Description
Drying Temperature(℃)
80
Mold Temperature(℃)
50~90
Melt Temperature(℃)
260~290
Injection Pressure(MPa)
90~140
Injection Speed
HIgh
Cooling Time(S)
20~60
Drying Time(hr)
2-3
Scrap Quantity(mm)
3~8
Back Pressure(MPa)
2~6
Clamping Force(ton/in2)
4~8
Return Speed (rpm)
70~90
Shrinkage
0.6%

PA66 Injection Molding Parameters

Parameter
Description
Drying Temperature(℃)
80
Mold Temperature(℃)
50~90
Melt Temperature(℃)
260~290
Injection Pressure(MPa)
90~140
Injection Speed
HIgh
Cooling Time(S)
20~60
Drying Time(hr)
2-3
Scrap Quantity(mm)
3~8
Back Pressure(MPa)
2~6
Clamping Force(ton/in2)
4~8
Return Speed (rpm)
70~90
Shrinkage
0.6%

POM Injection Molding Parameters

Parameter
Description
Drying Temperature(℃)
No need to dry
Mold Temperature(℃)
40~90
Melt Temperature(℃)
190~215
Injection Pressure(MPa)
80~140
Injection Speed
Medium
Cooling Time(S)
10~30
Drying Time(hr)
If damp, dry below 100℃ for 2 hours
Scrap Quantity(mm)
2~6
Back Pressure(MPa)
5~10
Clamping Force(ton/in2)
2~4
Return Speed (rpm)
50~70
Shrinkage
2% and 3.5%

PPS Injection Molding Parameters

Parameter
Description
Drying Temperature(℃)
120~130
Mold Temperature(℃)
85~140
Melt Temperature(℃)
300~340
Injection Pressure(MPa)
100~150
Injection Speed
Medium Or High
Cooling Time(S)
15~30
Drying Time(hr)
2~3
Scrap Quantity(mm)
3~10
Back Pressure(MPa)
5~12
Clamping Force(ton/in2)
4~5
Return Speed (rpm)
60~80
Shrinkage
0.4–0.8%

PC/ABS Injection Molding Parameters

Parameter
Description
Drying Temperature(℃)
80
Mold Temperature(℃)
60~80
Melt Temperature(℃)
250~280
Injection Pressure(MPa)
80~140
Injection Speed
Medium
Cooling Time(S)
30~120
Drying Time(hr)
2~3
Scrap Quantity(mm)
3~6
Back Pressure(MPa)
5~12
Clamping Force(ton/in2)
3~4
Return Speed (rpm)
60~90
Shrinkage
0.5–0.8%

PBT Injection Molding Parameters

Parameter
Description
Drying Temperature(℃)
110~120
Mold Temperature(℃)
50~75
Melt Temperature(℃)
250~270
Injection Pressure(MPa)
100~140
Injection Speed
High
Cooling Time(S)
15~60
Drying Time(hr)
2~3
Scrap Quantity(mm)
2~6
Back Pressure(MPa)
5~10
Clamping Force(ton/in2)
3~4
Return Speed (rpm)
70~90
Shrinkage
0.5% and 2.2%

PS Injection Molding Parameters

Parameter
Description
Drying Temperature(℃)
80
Mold Temperature(℃)
40~60
Melt Temperature(℃)
180~220
Injection Pressure(MPa)
70~120
Injection Speed
High
Cooling Time(S)
40~60
Drying Time(hr)
1
Scrap Quantity(mm)
3~12
Back Pressure(MPa)
5~10
Clamping Force(ton/in2)
2
Return Speed (rpm)
60~100
Shrinkage
0.4% and 0.7%

HIPS Injection Molding Parameters

Parameter
Description
Drying Temperature(℃)
80
Mold Temperature(℃)
30~75
Melt Temperature(℃)
175~230
Injection Pressure(MPa)
60~110
Injection Speed
Medium
Cooling Time(S)
10~80
Drying Time(hr)
1
Scrap Quantity(mm)
4~10
Back Pressure(MPa)
5~10
Clamping Force(ton/in2)
2
Return Speed (rpm)
60~100
Shrinkage
0.4% and 0.7%
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