A very complete list of common plastic injection molding technical parameters, please keep it!
Time：2022-06-08 09:09:21 / Popularity： / Source：
1. Injection pressure
Injection pressure is provided by hydraulic system of injection molding machine. Pressure of hydraulic cylinder is transmitted to injection molding melt through screw of injection molding machine. Plastic melt is driven by pressure and enters main channel of mold from nozzle, is injected into mold cavity through winding mouth. Pressure is to allow melt to be injected into cavity according to process and to ensure complete filling.2. Injection time
A reasonable injection time is helpful for filling of plastic melt, and injection time is generally about 1/10 of cooling time. It depends on different injection molding materials.3. Injection temperature
Injection temperature is an important factor affecting injection pressure. Injection temperature must be controlled within a reasonable range. If temperature is too low, plasticization of raw materials will be poor; if temperature is too high, raw materials will be easily decomposed. Therefore, temperature control needs to be reasonably controlled by experienced masters.4. Holding pressure and time
When injection molding is about to end, screw stops rotating, just pushes forward and enters pressure-holding stage. During pressure-holding process, nozzle constantly fills cavity with raw material melt to ensure integrity of product after molding. Holding pressure is generally about 80% of maximum filling pressure, which is determined according to requirements of actual raw materials and products.5. Back pressure
Back pressure refers to pressure that screw needs to overcome when screw is reversed and withdrawn to store material. High back pressure facilitates dispersion of pigments and melting of plastics.
Injection molding parameters of common plastics
PP injection molding technical parameters
| Drying temperature (℃) | 65～75 | Drying time about (hr) | 0.5～1 |
| Mold temperature (℃) | 35～65 | Residual material amount (mm) | 3 to 10 |
| Melting temperature (℃) | 200～250 | Back pressure (MPa) | 9 to 17 |
| Injection pressure (MPa) | 80～130 | Clamping force about (ton/in2) | 2 |
| Injection speed | medium | Return speed (rpm) | 60～90 |
| Screw category | Standard screw (straight-through nozzle) | ||
| Downtime | Just close gate and beer | Recycled scraps (%) | 15～30 |
Technical parameters of PE injection molding
| Drying temperature (℃) | 65～75 | Drying time about (hr) | 0.5 (do not need to dry) |
| Mold temperature (℃) | 40～70 | Residual material amount (mm) | 3 to 10 |
| Melting temperature (℃) | 180～220 | Back pressure (MPa) | 7～18 |
| Injection pressure (MPa) | 80～130 | Clamping force about (ton/in2) | 2 |
| Injection speed | medium | Return speed (rpm) | 60～100 |
| Screw category | Standard screw (straight-through nozzle) | ||
| Downtime | Just close gate and beer | Recycled scraps (%) | 20～40 |
Technical parameters of PVC injection molding
| Drying temperature (℃) | Do not need to dry, if it is wet, it needs to be dried below 70 ℃ for 1 hour. | ||
| Mold temperature (℃) | 30～50 | Residual material amount (mm) | 2 to 6 |
| Melting temperature (℃) | 160～185 | Back pressure (MPa) | 4 to 8 |
| Injection pressure (MPa) | 70～110 | Clamping force about (ton/in2) | 2 |
| Injection speed | Slow or medium | Return speed (rpm) | 50～80 |
| Screw category | Standard screw (straight-through nozzle) | ||
| Downtime | Cleaning with HDPE/PS | Recycled scraps (%) | 15～25 |
ABS injection molding technical parameters
| Drying temperature (℃) | 80 | Drying time about (hr) | 1.5 |
| Mold temperature (℃) | 45～80 | Residual material amount (mm) | 2 to 8 |
| Melting temperature (℃) | 190～235 | Back pressure (MPa) | 9 to 18 |
| Injection pressure (MPa) | 90～140 | Clamping force about (ton/in2) | 2～2.5 |
| Injection speed | medium | Return speed (rpm) | 70～100 |
| Screw category | Standard screw (straight-through nozzle) | ||
| downtime | Just close gate and beer | Recycled scraps (%) | 20～30 |
PMMA injection molding technical parameters
| Drying temperature (℃) | 80 | Drying time about (hr) | 2 to 3 |
| Mold temperature (℃) | 40～70 | Residual material amount (mm) | 2 to 6 |
| Melting temperature (℃) | 215～240 | Back pressure (MPa) | 13 to 28 (higher) |
| Injection pressure (MPa) | 100～170 | Clamping force about (ton/in2) | 4 |
| Injection speed | low speed | Return speed (rpm) | 60～80 |
| Screw category | Standard screw (if a larger injection pressure is required, a small screw can be used) | ||
| Downtime | Need to use PP material to clean | Recycled scraps (%) | 0 |
PC injection molding technical parameters
| Drying temperature (℃) | 90～110 | Drying time about (hr) | more than 2 hours |
| Mold temperature (℃) | 80～110 | Residual material amount (mm) | 2 to 8 |
| Melting temperature (℃) | 280～320 | Back pressure (MPa) | 6 to 15 |
| Injection pressure (MPa) | 130～180 | Clamping force about (ton/in2) | 4 to 6 |
| Injection speed | Medium or high speed | Return speed (rpm) | 60～80 |
| Screw category | Standard, thin (do not use dehumidifying screw and slingshot nozzle) | ||
| Downtime | Clean with HDPE | Recycled scraps (%) | 10～25 |
PA66 injection molding technical parameters
| Drying temperature (℃) | 80 | Drying time about (hr) | 2 to 3 |
| Mold temperature (℃) | 50～90 | Residual material amount (mm) | 3 to 8 |
| Melting temperature (℃) | 260～290 | Back pressure (MPa) | 2 to 6 |
| Injection pressure (MPa) | 90～140 | Clamping force about (ton/in2) | 4 to 8 |
| Injection speed | High speed especially thin wall | Return speed (rpm) | 70～90 |
| Screw category | Standard screw (do not use dehumidifying screw), needle valve nozzle. | ||
| Downtime | Just close gate and beer | Recycled scraps (%) | 5～15 |
| Remarks: For nylon nozzle material decomposed due to high moisture content, its performance cannot be restored, and it is difficult to use again even if it is re-dried. | |||
POM injection molding technical parameters
| Drying temperature (℃) | without drying | If wet, dry below 100℃ for 2 hours | |
| Mold temperature (℃) | 40～90 | Residual material amount (mm) | 2 to 6 |
| Melting temperature (℃) | 190～215 | Back pressure (MPa) | 5 to 10 |
| Injection pressure (MPa) | 80～140 | Clamping force about (ton/in2) | 2 to 4 |
| Injection speed | medium speed | Return speed (rpm) | 50～70 |
| Screw category | Standard screw (straight-through nozzle) | ||
| Downtime | Need to clean with PP/PE/PS material | Recycled scraps (%) | 30 |
PPS injection molding technical parameters
| Drying temperature (℃) | 120～130 | Drying time about (hr) | 2 to 3 |
| Mold temperature (℃) | 85～140 (plus heat insulation board) | Residual material amount (mm) | 3 to 10 |
| Melting temperature (℃) | 300～340 | Back pressure (MPa) | 5～12 |
| Injection pressure (MPa) | 100～150 | Clamping force about (ton/in2) | 4 to 5 |
| Injection speed | Medium to high speed | Return speed (rpm) | 60～80 |
| Screw category | Standard screw (straight-through nozzle) | ||
| Downtime | Just close gate and beer | Recycled scraps (%) | 20～30 |
PC/ABS injection molding technical parameters
| Drying temperature (℃) | 80 | Drying time about (hr) | 2 to 3 |
| Mold temperature (℃) | 60～80 | Residual material amount (mm) | 3 to 6 |
| Melting temperature (℃) | 250～280 | Back pressure (MPa) | 5～12 |
| Injection pressure (MPa) | 80～140 | Clamping force about (ton/in2) | 3 to 4 |
| Injection speed | medium speed | Return speed (rpm) | 60～90 |
| Screw category | Standard screw diameter is 50mm, and it is better to use a screw with a low compression ratio for a large screw | ||
| Downtime | Close gate to cool down injection | Recycled scraps (%) | 10～25 |
PBT injection molding technical parameters
| Drying temperature (℃) | 110～120 | Drying time about (hr) | 2 to 3 |
| Mold temperature (℃) | 50～75 | Residual material amount (mm) | 2 to 6 |
| Melting temperature (℃) | 250～270 | Back pressure (MPa) | 5 to 10 |
| Injection pressure (MPa) | 100～140 | Clamping force about (ton/in2) | 3 to 4 |
| Injection speed | high speed | Return speed (rpm) | 70～90 |
| Screw category | Standard screw (straight-through nozzle) | ||
| Downtime | Just close gate and beer | Recycled scraps (%) | 15～25 |
| Remarks: Fireproof PBT needs to use PE material to pass gun, and nozzle material should not be recycled. | |||
PET injection molding technical parameters
| Drying temperature (℃) | 100～120 | Drying time about (hr) | 3 to 4 |
| Mold temperature (℃) | 120～140 | Residual material amount (mm) | 3 to 8 |
| Melting temperature (℃) | 260～295 | Back pressure (MPa) | 5 to 10 |
| Injection pressure (MPa) | 100～140 | Clamping force about (ton/in2) | 3 to 4 |
| Injection speed | high speed | Return speed (rpm) | 60～90 |
| Screw category | Standard screw (straight-through nozzle) | ||
| Downtime | Need to use PE or PP material to clean barrel | Recycled scraps (%) | 10～20 |
PS injection molding technical parameters
| Drying temperature (℃) | 80 | Drying time about (hr) | 1 hour (usually without drying) |
| Mold temperature (℃) | 40～60 | Residual material amount (mm) | 3 to 12 |
| Melting temperature (℃) | 180～220 | Back pressure (MPa) | 5 to 10 |
| Injection pressure (MPa) | 70～120 | Clamping force about (ton/in2) | 2 |
| Injection speed | fast | Return speed (rpm) | 60～100 |
| Screw category | Standard screw (straight-through nozzle) | ||
| Downtime | Just close gate and beer | Recycled scraps (%) | 0 |
HIPS injection molding technical parameters
| Drying temperature (℃) | 80 | Drying time about (hr) | 1 hour (usually without drying) |
| Mold temperature (℃) | 30～75 | Residual material amount (mm) | 4 to 10 |
| Melting temperature (℃) | 175～230 | Back pressure (MPa) | 5 to 10 |
| Injection pressure (MPa) | 60～110 | Clamping force about (ton/in2) | 2 |
| Injection speed | medium | Return speed (rpm) | 60～100 |
| Screw category | Standard screw (straight-through nozzle) | ||
| Downtime | Just close gate and beer | Recycled scraps (%) | 15～30 |
K plastic injection molding technical parameters
| Drying temperature (℃) | Generally do not need to dry | If wet, it needs to be dried at below 65℃ for about 1 hour. | |
| Mold temperature (℃) | 20～60 | Residual material amount (mm) | 3 to 8 |
| Melting temperature (℃) | 170～250 | Back pressure (MPa) | 3 to 10 |
| Injection pressure (MPa) | 60～100 | Clamping force about (ton/in2) | 2～2.5 |
| Injection speed | medium | Return speed (rpm) | 70～100 |
| Screw category | Ordinary standard type (when transparency requirement is high, choose a special screw) | ||
| Downtime | Just close gate and beer | Recycled scraps (%) | 20～40 |
AS injection molding technical parameters
| Drying temperature (℃) | 80 | Drying time about (hr) | 1 to 2 |
| Mold temperature (℃) | 40～80 | Residual material amount (mm) | 3 to 10 |
| Melting temperature (℃) | 210～250 | Back pressure (MPa) | 5～15 |
| Injection pressure (MPa) | 100～140 | Clamping force about (ton/in2) | 2～2.5 |
| Injection speed | medium | Return speed (rpm) | 70～100 |
| Screw category | Standard screw (straight-through nozzle) | ||
| Downtime | Just close gate and beer | Recycled scraps (%) | 0 |
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