Integrated line vs stand-alone machines: when integration pays

Stand-alone machines: when they are the right choice

Stand-alone machines (chambers, autonomous tray sealers, non-integrated thermoformers) are the optimal choice for production up to 200-400 packs/hour, highly variable product mix, multi-product manufacturing with small batches, and when the operator must intervene frequently in the process (high-value products requiring visual inspection).

The main advantage is flexibility: each machine can be dedicated to a specific product or moved to different points in the line. Initial investment is lower and ROI is faster for small-medium production.

• Volumes: < 400 packs/hour per product type
• Variable mix: > 10 SKUs with batches < 500 pieces
• Manual control needed for high-value products
• Initial investment: €20,000-100,000 per machine
• Flexibility: easy relocation and reconfiguration

Integrated line: when it is the right investment

An integrated line connects weighing/portioning, packaging, labelling, weight checking and metal detection in a single automatic flow governed by a central PLC. It is the right choice when volumes exceed 500-600 packs/hour per product, mix is stable (5-10 recurring SKUs), and headcount reduction is desired.

Integration allows reaching 80-90% OEE, complete traceability of every piece, statistical process control (SPC) and MES integration. Cost is significantly higher (€500,000-2,000,000) but ROI is achieved through headcount reduction and productivity increase.

• Volumes: > 500 packs/hour for main product
• Stable mix: 5-10 SKUs with long production runs
• Headcount reduction: from 3-5 operators to 1-2 supervisors
• Investment: €500,000-2,000,000 for complete line
• Achievable OEE: 80-90% with optimal maintenance

Cost-benefit analysis: the decision model

The critical threshold is labour cost: when the annual cost of operators (€30,000-45,000/year/person including charges) multiplied by the number of operators exceeds the financing cost of the integrated line, the investment is justified. With 4 operators at €40,000/year = €160,000/year labour cost: an €800,000 line pays back in 5 years from headcount reduction alone, without counting the productivity increase.

• Calculate the annual cost of operators dedicated to the line
• Calculate the annual financing cost (leasing instalment × 12)
• If operator cost > financing cost: integration pays
• Add the value of productivity increase (packs/hour × margin)
• Consider the value of overtime hours avoided

The middle ground: semi-automation and modularity

Between full stand-alone and integrated line there is a widely-practised middle ground: the modular semi-automatic line. Starting from a main machine (thermoformer or automatic tray sealer) with automatic product feeding and exit conveyor, without integrating weighing and labelling. Second step adds weight checking; third step adds automatic labelling. Each step is justified by volumes reached.

• Step 1: automatic thermoformer/tray sealer + exit conveyor
• Step 2: adding automatic weigher with automatic rejection
• Step 3: integrated automatic labelling
• Step 4: metal detection and shrink tunnel in-line
• Each step is an incremental investment justified by volumes