Film KPIs

Film Converting KPIs and Benchmarks: OEE, Yield, Gauge, and Web Break Targets

Typical versus world class numbers for film and converting plants across ten KPIs, with the specific levers that move each one.

A film or converting plant needs about ten numbers on the wall: OEE, door to door material yield, scrap rate, gauge 2 sigma, coat weight capability, web breaks per 100 roll changes, changeover time, first pass barrier pass rate, energy per kg, and solvent recovery efficiency. Typical and world class plants differ by a factor of 2 to 4 on most of them. Measurement method matters as much as the target: a plant reporting 97 percent yield measured only at the slitter is usually an 85 to 88 percent plant when measured from resin receipt to shipped roll.

OEE for cast and blown film lines typically runs 55 to 70 percent; world class is 80 to 85 percent. Coating and lamination lines run lower, 45 to 60 percent typical and 70 to 75 percent world class, because changeovers and drying limited speeds punish both availability and performance. Score performance against a demonstrated rate per structure, not nameplate; the Extrusion Throughput calculator sets that standard so a 40 micron nylon structure is not judged against LDPE speeds. The single biggest OEE lever in converting is changeover: plants that cut job changes from 90 minutes to 35 minutes typically gain 5 to 8 OEE points at normal run lengths.

Door to door material yield, salable kg shipped over raw material kg consumed, runs 82 to 90 percent at typical converters and 93 to 96 percent at the best. Track it by structure with the Lamination Yield and Roll Scrap Cost calculators. Edge trim should stay under 4 percent of web width, and startup scrap under 2 percent of run weight on jobs over 5,000 kg. Set scrap targets in kg per changeover rather than percent, or short runs always look bad while long runs hide waste. World class plants regrind or resell more than 70 percent of unavoidable scrap; typical plants manage under 40 percent.

Quality capability benchmarks: gauge 2 sigma of 5 to 8 percent is typical for blown film, 3 to 4 percent for modern cast lines with automatic dies, and under 2 percent is world class. Every point of gauge variation is roughly a point of resin giveaway, so a 2 point improvement on a 10,000 tonne per year line saves about 200 tonnes of resin. Coat weight should hold a Cpk of at least 1.33 against spec limits; the best stations hold 1.67 with sigma under 3 percent of target. The Film Gauge Variation and Coating Weight Yield calculators turn weekly scanner and cut and weigh data into these capability numbers.

Web breaks: typical converters see 1 break per 5 to 10 rolls on thin gauge or high tension products, while world class operations run below 1 per 50 rolls. Log every break with web position and suspected cause; 60 to 70 percent usually trace back to splice quality and slit edge defects, both fixable within a quarter. Use the Web Break Cost calculator to rank products by break cost so maintenance effort follows the money. Changeover benchmarks: 60 to 120 minutes is typical for a coating job change, 20 to 40 minutes is world class with staged tooling and premixed adhesive, and slitter set changes should finish in under 15 minutes.

For barrier products, track first pass barrier pass rate, meaning lots that meet OTR and WVTR spec on the first test. Typical plants pass 92 to 96 percent first time; world class holds above 99 percent by controlling the upstream drivers, EVOH layer uniformity and bond strength above 2.5 N per 15 mm. Instrument time is a hard constraint because an OTR cell needs 4 to 24 hours per specimen, so plan lab capacity with the Barrier Performance Test Load calculator and hold release turnaround under 48 hours. Plants that let turnaround drift to a week end up either shipping at risk or sitting on 100 tonnes of unreleased inventory.

Energy intensity: blown film plants typically run 0.9 to 1.4 kWh per kg of film, while efficient plants get under 0.75 kWh/kg with variable speed drives, insulated barrels, and optimized cooling. Coating lines should track MJ per kg of solvent evaporated using the Drying Energy calculator; below 6 MJ/kg is strong with heat recovery, above 12 signals air leaks or excessive exhaust volume. Solvent capture should exceed 95 percent for carbon bed systems, with 98 to 99 percent world class, and the Solvent Recovery calculator converts that gap into dollars and VOC compliance margin. Retained solvent in finished laminate must stay under 5 mg/m2 for food contact work.

An improvement sequence that works: instrument first, meaning automatic scrap weighing, break logging, and per structure rate standards, and collect 8 to 12 weeks of data before setting targets. Then attack only the top two losses. Most converting plants find changeover time and gauge giveaway are worth 3 to 5 margin points combined, more than any capital project under $1 million. Review KPIs weekly at the line and monthly by structure. Benchmark against your own best demonstrated performance: the best week in the last 26 defines what the equipment can actually do, and closing half the gap to it within a year is a realistic target. Costing methods and formulas live in the companion guides.

Published 2026-07-02.