Hello and welcome to a new blog post in which we’re sharing a practical rule of thumb for estimating the maximum injection pressure in plastics injection molding.
It’s straightforward: take the minimum necessary injection pressure of your chosen polymer and simply multiply by 1.2.
The result? Your maximum injection pressure.
Examples applying this rule
Let us look at a few examples with standard parts and medium-viscosity polymers:
- Polyamide: Minimum pressure = 110 MPa → Maximum = 130 MPa
- Polyethylene: Minimum = 100 MPa → Maximum = 120 MPa
- Polycarbonate: Minimum = 120 MPa → Maximum = 150 MPa
- It is a quick and easy way to estimate directly at your machine
- Improves the process stability
- Protects the machine and the mold
This simple approach helps you quickly estimate your injection molding parameters and ensures smoother processing—every time!
More Rules of Thumb can be found in my "start here" section.
Thanks for reading & #findoutaboutplastics
Greetings,
Herwig
Literature:
[1] Natti Rao: https://www.hanser-elibrary.com/doi/pdf/10.3139/9783446431492.fm
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