This case study covers an anonymized food manufacturer with decades of operating history in canned goods, processed meat, and prepared meal kits, distributing nationally. The plant’s dosing stage consumes dozens of powder and granular minor ingredients — starch, sugar, compound spice blends, and various food additives — with widely varying physical properties and dosing quantities. The building’s fixed structural layout and compact floor plan ruled out large-scale civil construction, while rising HACCP and downstream customer quality-assurance requirements were exposing the limits of manual dosing. Wijay Systems was engaged to evaluate the constraints and design a dosing automation retrofit that worked within the existing building rather than around it.
Core Operational Challenges
| Challenge | Description |
|---|---|
| Manual dosing labor and uncontrolled error risk | Bulk ingredient handling and platform-scale weighing relied on manual transport and unpacking, with no system-level check against operator fatigue or scale drift |
| Dust from open feeding | Manual unpacking and open dosing generated dust that settled on equipment and floors, increased cleaning workload, contributed to material loss, and raised occupational exposure concerns with certain irritant spice powders |
| Operator variance driving batch-to-batch flavor drift | Different shifts and operators weighed ingredients with different habits, and weighing deviations passed directly into the next process step with no interception mechanism |
| Paper-based traceability shortfall | Dosing records were kept on handwritten paper documents that were prone to alteration, damage, and slow retrieval, limiting the ability to trace operator, material batch, or weighing data during a quality complaint or audit |
| Weak batch and expiry control | Minor ingredients were stored across the workshop floor with batch and expiry tracked by memory and paper labels, creating risk of material mix-ups or expired ingredients entering production |
Custom-Engineered Bulk-Material Handling Solution
Rather than pursuing a fully unmanned dosing line, the design followed a pragmatic path: digital verification and process control layered onto retained manual work for low-volume, high-variability ingredients, combined with automated conveying only where ingredient volume justified it. The resulting architecture has four modules working together over a shared industrial communication layer —at the workstation, partial pneumatic conveying for bulk powders, material batch/inventory verification, and full-process data traceability.
High-usage ingredients such as bulk sugar and starch move through a partially enclosed pneumatic conveying unit that automates feeding and removes manual carrying and unpacking from the workflow, suppressing dust at the source. Lower-volume, specialty ingredients — spice blends and compound additives with diverse specifications — remain on manual dosing at the workstations, where an HMI screen guides the operator through the recipe and cross-checks the weighing data in real time. A deviation beyond the configured tolerance triggers a visual/audio alert and locks the process step until corrected.
Key System Components
| Module | Function |
| Smart-assisted dosing workstations | HMI-guided manual dosing with real-time weight verification and deviation lockout for low-volume ingredients |
| Partial pneumatic conveying unit | Enclosed automated feeding for high-volume bulk sugar and starch, replacing manual transport and unpacking |
| Material batch verification & inventory module | Cross-checks incoming material batch number and expiry date at the point of dosing; blocks expired or unverified material |
| Full-process traceability module | Archives operator ID, material batch, dosing time, weighing data, and equipment alarm history per production run |
Project-Specific Engineering Difficulties
| Engineering Difficulty | Design Response |
|---|---|
| Retrofitting a fixed, space-constrained structure without civil work | Equipment layout sized to reuse existing floor space, interfaces, and workflow rather than requiring new construction |
| Managing dozens of ingredients with widely different physical properties and dosing ranges under one verification system | Recipe-specific, configurable tolerance thresholds set per ingredient rather than a single fixed system-wide parameter |
| Deciding which ingredients justify automated conveying versus manual dosing | Segmented by usage volume — bulk sugar/starch routed to pneumatic conveying; low-volume specialty spices kept on smart-assisted manual stations to preserve adaptability and control capital cost |
| Integrating batch/expiry verification without duplicating existing inventory records | Bound to the plant’s existing incoming-material ledger rather than run as a separate parallel system |
FAQ
Why not implement a fully automated, unmanned dosing system in an older plant?
Full automation for dosing dozens of low-volume, highly variable ingredients typically requires more equipment footprint and capital than a fixed, space-constrained building can accommodate. A smart-assisted approach adds verification and error-proofing to manual work instead, which is often a better fit for cost and material adaptability.
How does a smart-assisted dosing workstation catch errors a manual platform scale would miss?
The workstation cross-checks live weighing data against the recipe’s target value as the operator dispenses. If the reading falls outside a configured tolerance, it triggers a visual and audio alert and locks the process step, which a standalone platform scale has no way to do on its own.
Can pneumatic conveying be added for only some ingredients while others stay on manual dosing?
Yes. It’s common to route high-volume bulk ingredients like sugar or starch through pneumatic conveying while keeping low-volume, specialty ingredients — such as spice blends with diverse specifications — on manual dosing stations, balancing automation cost against material variety.
How is expired or incorrect-batch material intercepted before it reaches production?
Batch number and expiry data are checked against the incoming-material ledger at the point of dosing. If the material is expired or unverified, the system blocks that dosing step, rather than relying on staff to catch it from memory or paper labels.
What does a retrofit like this typically require in terms of civil work?
Where the plant’s structure and floor space are treated as fixed constraints, the equipment and workflow are sized to fit the existing layout, avoiding new construction. The tradeoff is that equipment placement and material routing are planned around what’s already there rather than an open floor plan.
