Plastic Injection Moulding: Work Order & Scrap Tracking Software

Injection moulding looks straightforward from outside: machine, mould, plastic in, parts out. The data demands underneath are anything but. Shot counts that determine mould preventive maintenance. Cycle times that determine costing. Cavity tracking that determines which cavity is producing rejects. Regrind management that determines how much recycled material is going back into virgin runs. None of this fits a generic work-order template.

Here's how to track all of it without commissioning a custom ERP.

Work Orders Tied to Mould + Material + Machine

A moulding work order isn't just "produce 5,000 of part X." It's part X on mould M-12, machine IM-04, with material grade A regrind percentage 15%. All four fields drive cost, quality, and traceability. A work order template missing any of these is a work order you can't audit.

Shot Count Per Mould

Every mould has an OEM-rated shot life — typically 100,000 to 1,000,000 shots depending on material and complexity. Tracking cumulative shots per mould drives preventive maintenance scheduling. Exceeding rated shot life without maintenance is the leading cause of catastrophic mould failures, which can cost ₹2–10 lakh to repair.

Cycle Time vs. Standard

Each part has a standard cycle time. Actual cycle time creeping above standard is a leading indicator: cooling system degrading, machine wearing, operator running sub-optimal parameters. Tracking actual vs. standard cycle time per shift surfaces these problems before they become quality problems.

Cavity-Level Reject Tracking

Most moulds are multi-cavity. Some cavities consistently produce rejects while others produce perfectly — a worn or contaminated cavity, not a process problem. Without cavity-level tracking, you treat a single-cavity issue as a process problem and waste days adjusting parameters. With it, you isolate the bad cavity in 15 minutes.

Regrind Management

Runner waste and rejected parts get ground and re-introduced. The percentage of regrind in any run affects part quality, strength, and appearance. Customer specs often cap regrind percentage. A working system tracks regrind inventory by material grade, computes the regrind percentage per batch, and prevents non-compliant runs.

Scrap Categorized by Cause

Flash, short-shot, sink mark, contamination, colour issue, dimensional out-of-tolerance — each scrap reason points to a different fix. Generic "scrap: 47 units" gives you no fix; tagged scrap reasons over a month surface the dominant causes and direct improvement effort.

How to Implement Without a Custom Build

Most mid-market manufacturing software can be configured for moulding without custom code if it supports: multi-cavity work orders, cumulative shot count fields, machine + mould + material work order linkage, and tagged scrap categories. Ask vendors for screenshots of these specific configurations. If they can't show them, you're being sold a generic tool that will look elegant in demo and fail in operation.