Scenario summary
A restaurant group commissary serving 15-50 outlets produces portioned meal components on standardized trays for distribution: cold-side components (salads, sauce ramekins, dessert plates), portioned proteins (steaks, fish fillets), and prepped vegetables. A medium commissary cycles 800-2,500 meal tray wash events per day, peaking during the morning prep window before delivery routes leave.
Manual washing of a meal tray with set-on residue (cream sauces, vinaigrettes, dessert glazes) takes 25-40 seconds per tray. The PTW-1900 handles 45 meal trays per 6-min cycle = 8 seconds per tray equivalent, with documented 82°C HACCP-aligned sanitization and PLC cycle logging.
Why commissary tray washing has distinct pressures
- Delivery-window timing — commissary outputs hit the morning delivery window; the wash bay is on the critical path
- Outlet-specific dietary segregation — restaurant groups with allergen-aware menus need documented segregation per outlet’s risk profile
- HACCP critical control point — cook-chill cycle wash between batches is a CCP requiring documented evidence
- Cross-flavor prevention — same trays cycle between Italian outlet (tomato/cheese) and Asian outlet (soy/sesame). Residual flavor transfer is a brand-quality issue
Recommended PTW-1900 configuration
- Electric 70 kW version — typical commissary infrastructure
- Tray rack accessory — holds 45 standard meal trays (typical 600 × 400 mm or 480 × 330 mm) per cycle in vertical orientation
- Standard cycle PLC profile — 6-min cycle, 68°C wash, 82°C final rinse
- Stored “Outlet Segregation” PLC profile — 90-second 85°C clean rinse between outlet batches
- Barcode scanner — scan delivery batch ID before loading; PLC logs batch + cycle parameters for HACCP traceability
- MES integration — Modbus RTU output of cycle data into commissary’s production-planning system
Throughput sizing
| Commissary scale | Daily tray events | Single PTW-1900 |
|---|---|---|
| Small (5-10 outlets) | 200-500 | Easy headroom |
| Medium (15-30 outlets) | 800-2,200 | Comfortable single machine |
| Large (30-50 outlets) | 2,200-4,500 | Single + peak buffer |
| Very large (>50 outlets) | 4,500+ | Dual machines |
ROI for a 30-outlet restaurant group commissary
- Labour displaced: 6 hours/day at USD 20 × 312 = USD 37,400/year
- Tray inventory amortization — PC tray life extended 50% by PTW-1900 thermal vs chemical = USD 8,500/year
- Sanitizer chemical elimination = USD 4,800/year
- HACCP audit defensibility — PLC log auto-generates documentation = USD 8,000/year management
- Delivery-window compliance — eliminating wash bottleneck protects on-time outlet delivery; estimated USD 25K/year avoided expediting
Combined with GN + sheet pan + trolley workflows on the same PTW-1900, payback in 13-16 months.
Common commissary FAQ
Q: Our 30 outlets have different dietary risk profiles — some serve allergen-aware menus, others don’t. How segregate? A: Use “Outlet Segregation” profile — 90-second 85°C clean rinse between outlet batches. Document per-outlet cycle in PLC log. Standard practice for groups with mixed risk profiles.
Q: Polycarbonate vs stainless trays — wash differently? A: Same PTW-1900 chamber, different rack accessories. PC trays: pH 8-10 detergent, 82°C max rinse with 15-sec dwell (avoid PC softening). Stainless trays: any pH detergent, full 82-90°C rinse with longer dwell.
Q: 5 AM delivery window — wash throughput? A: 3-hour overnight prep × 10 cycles/hour × 45 trays = 1,350 trays. For commissaries with morning throughput exceeding 1,350 trays, plan staggered prep or install dual machines.
Q: Group expanding from 30 to 50 outlets — single machine adequate? A: At 50 outlets, daily tray events ~3,500-4,000. Single PTW-1900 at full utilization handles ~10,000/day theoretical max but practical limit is 4,500 with peak buffer. Dual machines recommended for the 50-outlet group.