Equipment Operation, Cleaning, and Maintenance
This domain tests whether you can run, clean and maintain confectionery equipment without creating safety or quality risk: cookers, depositors, moguls, enrobers, temper units, cooling tunnels, ball mills, conches, wrappers and metal detectors.
Core rules
- Start-up checks: guarding in place, emergency stops tested, jackets and seals sound, calibration in date, water and air supplies at specification.
- Cleaning regimes: CIP for wet, pumpable circuits (caustic ~1.5–2 % at 75–80 °C, adequate flow velocity, rinse to neutral); foam/COP for open surfaces; dry cleaning for dry rooms. Sequence is always coarse debris removal, then detergent, rinse, sanitise, dry.
- Verification: visual, ATP swabs, allergen-specific swabs, and micro swabs on a rotating schedule. Cleaning is not finished until it is verified.
- Lubrication: food-grade H1 for incidental contact, H2 for non-contact; keep a register and never substitute industrial oil.
- Maintenance: condition-based checks on bearings, belts, gaskets and blades; worn depositor seals and blades cause weight drift and metal fragments.
- Metal detection and magnets: test with ferrous, non-ferrous and stainless standards at the start and end of every run; record the result.
- Sugar dust: earth and bond equipment, avoid compressed air, use vacuum or wet methods.
Worked example
Deposited sweets drift from 5.0 g to 5.25 g over a shift, and the checkweigher rejects rise. Reasoning: weight is set by the depositor piston and hopper level. First check hopper temperature and level (viscosity change alters fill), then inspect the piston seals for wear and the nozzle for partial blockage. Adjust the stroke, run five consecutive weight checks within tolerance, and record the change; if seals are worn, raise a maintenance work order rather than continually adjusting stroke.
Traps
- Blowing down equipment with compressed air in a dry room.
- Releasing a line on visual inspection alone.
- Signing a metal-detector log without running test packs.
- Using a food-safe lubricant of the wrong grade on a bearing that contacts product.