# Machine Clamp Tonnage Calculator For Polypropylene.

## Correct Clamp Tonnage

Using a clamp tonnage calculator is a requirement for machine selection.

But what is the right clamp tonnage for producing a particular part?

In injection molding, finding the right tonnage can be tricky. Just because a moulding machine can produce a clean looking part without flash it doesn’t mean the clamp is enough.

For any particular part, there are a range of clamp tonnages than can produce parts that appear to be ok.

The correct tonnage will produce parts to the target weight consistently over an extended period of time. This is assuming that the process parameters have been setup correctly and optimized so that consistent fill times are maintained and hold pressure is not excessive.

If process parameters are not optimized then tonnage will need to be higher than is necessary. This uses extra electrical energy and increases the rate of wear in the mould and machine.

## Clamp Tonnage Calculator

Use the following calculator to get an estimate of the tonnage required to mould a rectangular or round part. This calculator is to be used as a guide and the results are not guaranteed. For a more accurate calculation contact your moulding machine supplier.

 Square & Rectangular Parts:(mm) Round Parts:(mm) Length: Diameter: Width: Max Flow Length From Gate: Max Flow Length From Gate: Wall Thickness: 0.40 0.50 0.60 0.70 0.80 0.90 1.00 1.10 1.20 1.30 1.40 1.50 1.60 1.70 1.80 1.90 2.00 Wall Thickness: 0.40 0.50 0.60 0.70 0.80 0.90 1.00 1.10 1.20 1.30 1.40 1.50 1.60 1.70 1.80 1.90 2.00 Number of Mold Cavities: Number of Mold Cavities: Material Flow Index (MFI): 15 25 35 Material Flow Index (MFI): 15 25 35 Answer: Metric Tons Answer: Metric Tons