Edible Oil Warehouse RFID Pallet Tracking

A high-capacity edible oil refining and packaging plant produces millions of liters annually across 14 to 15 distinct oil varieties (including Mustard, Refined Sunflower, Groundnut, Soybean, Sesame, and Rice Bran oils). On the packaging lines located on the 1st Floor, bottles are filled, capped, and packed into corrugated cardboard shipping cartons containing 10 to 12 bottles per box.

From the 1st Floor packaging hall, packed cartons are loaded onto multi-tier steel trolleys and transported via heavy-duty industrial freight elevators (lifts) down to the Basement storage and buffer distribution warehouse. The facility faced severe material handling challenges: tracking thousands of moving cartons across multiple vertical floors, preventing mixed-SKU batch errors among 15 lookalike oil varieties, and eliminating tedious manual clipboard tally sheets at lift gates.

To ensure seamless operation by shop-floor personnel without software complexity at packing benches, RFID Softwares designed a hybrid visual-and-digital identification protocol:

• 15-Color Variant Coding: Each of the 14–15 edible oil varieties was assigned a designated high-visibility color banner corresponding to carton artwork.
• High-Speed RFID Pre-Encoding: Using the Zebra ZD621R 300DPI RFID Printer, rolls of UHF Inlay Labels were pre-printed and encoded in automated batches. In a single 1-second pass, the printer writes the unique 96-bit EPC serial ID into the internal chip, prints the corresponding oil color stripe, batch number, MRP, manufacturing date, and a 2D QR code on the label face.
• Box Insertion Workflow: At the packaging conveyor, operators simply select the matching color-coded RFID sticker, place it inside the carton box alongside the 10–12 bottles, and tape the box shut.

Zebra Thermal Encoding & QR Code Synchronization: The Zebra ZD621R 300DPI printer is networked directly to the facility’s central packaging server. When a production work order is released for a specific batch (e.g. 5,000 cartons of 1-liter Refined Groundnut Oil), the printer prints the vibrant color band, encodes the unique GS1-compliant SGTIN-96 EPC serial number into the Monza R6 silicon chip, and prints a corresponding 2D QR code. This dual-layer identification allows warehouse operators to perform quick optical smartphone scans if needed while enabling hands-free automated RFID gate sweeps.

To capture carton transit without altering worker routines or stopping trolleys, RFID Softwares deployed an automated vertical checkpoint network using UHF Integrated RFID Readers with built-in 9 dBi circular polarized antennas:

• Reader 1 (1st Floor Gateway): Mounted directly above the 1st Floor freight elevator entrance, covering the packaging hall exit.
• Reader 2 (Basement Gateway): Mounted above the Basement elevator entrance, covering the main storage shed receiving corridor.

Both readers connect over local industrial Ethernet (PoE+) to the on-premise WMS edge gateway controller.

The core innovation lies in the sequential time-of-flight directional algorithm that automatically manages inventory status based on transit path:

1. Inward Stock Addition (Packaging 1st Floor → Basement Storage): When a trolley packed with newly boxed cartons enters the 1st Floor lift, Reader 1 detects the tags first. When the lift descends and the trolley rolls out into the basement, Reader 2 detects the tags second. The middleware identifies the sequence (Reader 1 → Reader 2) as an INWARD STORAGE EVENT, instantly adding the exact carton count, oil SKU types, and batch IDs to the live Basement warehouse inventory.

2. Outward Stock Deduction (Basement Storage → 1st Floor Dispatch): When cartons are pulled from the basement for outbound customer dispatch, Reader 2 detects the tags first, followed by Reader 1 at the 1st Floor exit. The middleware identifies the sequence (Reader 2 → Reader 1) as an OUTWARD DISPATCH EVENT, automatically decrementing stock from the warehouse dashboard and validating the load against the sales order.

All transactions are processed at the edge and reflected on the supervisor’s live web dashboard in sub-second latency.

Trolley Density & Speed Validation: Each custom steel warehouse trolley carries between 40 and 60 packed carton boxes (totaling 400 to 720 individual oil bottles per load). As the trolley moves through the freight elevator door threshold at speeds up to 1.2 m/s, the integrated reader’s circular beam sweeps the entire trolley profile, recording all 40–60 carton tags in under 250 milliseconds with 100% read completeness.

A primary hurdle in liquid FMCG tracking is electromagnetic RF wave absorption. Edible vegetable oils possess high dielectric permittivity, which dampens and refracts 865–867 MHz UHF radio signals if tags are stuck flat onto liquid-filled plastic bottles.

The Engineering Solution: By placing the pre-encoded UHF inlay tag on the inner or outer cardboard carton wall rather than directly onto the PET bottle surface, the system maintains a vital air-dielectric spacing boundary. Combined with 9 dBi circular polarized reader antennas that eliminate tag orientation sensitivity, the lift gateways achieve a consistent 100% read rate across 40+ cartons per trolley moving at normal walking speeds.

Deploying the color-coded RFID pre-encoding system and freight lift directional gateways delivered immediate operational dividends:

• 100% Automated Vertical Inventory Visibility: Completely eliminated manual clipboard recording and tally discrepancies between packaging and storage floors.
• Zero Mixed-SKU Shipping Errors: Foolproof 15-color matching combined with automated RFID verification prevented wrong-oil dispatches across thousands of daily cartons.
• Zero Trolley Bottlenecks: Workers push trolleys freely into and out of elevators without pausing for line-of-sight barcode scanning.
• Rapid 3.2-Month Payback: Reduced audit labor, eliminated stock mismatches, and automated WMS inventory updates paid for the entire hardware and software investment in under 100 days.