Injection Molding worked example
Regrind Percentage with regrind weight blended per shot of 6 g: a worked example
Suppose regrind weight blended per shot falls to 6 g. This page works the full calculation at that level so you can see exactly which result moves and by how much. Calculate the regrind content as a percentage of total shot weight to stay within resin supplier and quality limits.
The inputs for this scenario
- Regrind weight blended per shot: 6 g (the input this scenario stresses; the baseline uses 12)
- Total shot weight (virgin plus regrind): 56 g (held at the documented default)
Working through the calculation
- The calculation starts from the formula this tool documents: Regrind percentage = (Regrind weight / Total shot weight) x 100.
- Rate works out to 10.71 % at these inputs, and this is the headline figure for the scenario.
- Gap to target works out to -10.71 points at these inputs.
- Affected count works out to 6 count at these inputs.
- Total count works out to 56 count at these inputs.
How this compares with the baseline
- Against the tool's baseline example, where regrind weight blended per shot sits at 12 g and the headline result is 21.43 %, this scenario comes in 50% below the baseline at 10.71 %.
- It computes the percentage of a shot made up of regrind by dividing regrind weight by total shot weight and multiplying by 100. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.
Results at a glance
- Rate: 10.71 % (headline result)
- Gap to target: -10.71 points
- Affected count: 6 count
- Total count: 56 count
Run it with your numbers
- To rerun this with your own numbers, open the live Regrind Percentage calculator, set regrind weight blended per shot to your actual value, and adjust the remaining inputs to match your operation.
Last reviewed 2026-05-12.