Dedicated or Shared Allergen Lines: What It Does to OEE

Key takeaways

• A shared line loses time to allergen cleans. A dedicated line can lose time to low demand.
• OEE alone favours the dedicated line, because it never counts the hours the line is not planned.
• Compare options in good output time against the demand for each product family.
• The demand split decides which option makes more product.
• The food safety team weighs cross-contact risk. This guide covers the capacity side only.

Dedicating a line to one allergen family removes the heavy cleans between families, but that line can then only make its own products. Sharing lines keeps them busy, but every switch between families costs a validated clean. Which option makes more product depends on the demand split, and OEE alone will not tell you.

Fabrico, OEE and light MES software with AI cameras, measures OEE live by line and shift and prices each loss in money. The decision to dedicate a line stays with your planning, operations and food safety teams.

What changes when an allergen line is dedicated?

• No allergen cleans between families on that line, only ordinary changeovers within the family.
• A simpler changeover matrix and fewer validated cleans to run and check.
• Less flexibility: spare time on one line cannot be used to make the other family.

Each validated allergen clean cannot be shortened without revalidation. So on a shared line, the only way to save those hours is fewer switches between families, or fewer families on the line.

Why can OEE mislead this decision?

OEE is measured against planned production time. A dedicated line with little demand is simply planned for fewer hours, so its OEE can look excellent while it stands idle. TEEP measures against all time instead, and TEEP = loading x OEE, where loading is the share of time planned for production.

A shared line carries its allergen cleans inside planned time, so its OEE looks worse. It can still make more product. Our guide to TEEP explains the loading side.

Worked example: two lines, two product families

Sample line (illustrative numbers, not a customer). Two lines each have 4,800 planned minutes a week. Without allergen cleans, each runs at 80% OEE. When shared, each line needs 2 allergen cleans a day of 90 minutes, which is 900 minutes a week per line.

Family X has no allergens; family Y contains milk. Demand is measured in minutes of good output time a week.

The shared lines' OEE is (4,800 minus 900) / 4,800 x 0.80 = 65.0%. The dedicated lines show 80.0%. On OEE, dedicating wins by 15 points in both cases.

On output, it depends. In case 1, dedicated lines are short by 1,160 minutes against 1,760 for shared: dedicating wins by 600 minutes a week. In case 2, dedicated lines are short by 2,160: sharing wins by 400 minutes, because the milk line's spare time cannot make family X.

At an illustrative USD 30 of margin per minute of good output time, 600 minutes are worth USD 18,000 a week (about EUR 16,600). The OEE gap would have pointed the same way in both cases, and been wrong in one.

What else should the decision weigh?

• Cross-contact risk, which your food safety team assesses.
• How stable the demand split is, because the answer flips when it moves.
• New products planned for each family.
• Staffing, since fewer cleans can free a crew for other work.
• Label and packaging complexity on each line.

For the clean itself, read our guide to allergen changeover validation.

How should you present the choice to management?

1. Show good output time against demand per family, for each option.
2. Show TEEP and loading next to OEE, so idle hours are visible.
3. Test two or three demand splits, so the board sees where the answer changes.
4. Price the gap in money, per week and per year.
5. Add the food safety view from your food safety team, alongside the numbers.

Measure the clean minutes on the real lines first. Our guide to changeover time shows how to time them from last good unit to first good unit.

Which mistakes skew a dedicated vs shared comparison?

• Comparing OEE only, so the idle hours on a dedicated line never show.
• Using guessed clean times instead of measured ones from the real lines.
• Testing one demand split, when next year's mix may flip the answer.
• Booking allergen cleans as planned time on the shared lines, which hides their cost.

Where does Fabrico fit?

Fabrico is a computer vision enabled Manufacturing Performance Platform. OEE and light MES come first, so every option is judged on measured data.

• Automatic downtime logging, so allergen cleans are timed by the machine.
• The operator confirms the reason in one tap, so cleans get their own codes.
• Every loss priced in money, so the cost of each option is clear.
• One view across plants, where the same choice is made on several sites.

It is the OEE layer of a light MES. You start on one line, with a baseline and a decision date agreed in advance. There is no free plan and there are no tiers: each plant gets a quote.

Frequently asked questions

Is a dedicated allergen line better for OEE?

Usually its OEE looks better, because it has no allergen cleans inside planned time. But OEE does not count the hours a dedicated line is not planned. Compare good output time against demand for each product family before you decide.

How do allergen cleans affect a shared line's OEE?

Each clean sits inside planned production time, so it lowers Availability. Two cleans of 90 minutes a day on a line with 960 planned minutes take almost a fifth of its time. Track them under their own code, and against a standard per product switch.

What is the best way to compare line options?

Use good output time against demand, per product family, for each option. Add TEEP and loading next to OEE, test a few demand splits and price the difference in money. One OEE number per line is not enough to decide.

When does a dedicated allergen line make sense?

On capacity alone, when each family's demand roughly fills its own line, so little time sits idle. It may also make sense for food safety reasons, which your food safety team weighs. If demand moves a lot, shared lines keep more flexibility.

Who should decide whether to dedicate a line?

Planning, operations and food safety together. Planning and operations bring the demand split and the capacity numbers. The food safety team brings the cross-contact risk and the cleaning plan. The OEE data shows what each option really costs.

Compare your own line options

Bring your demand by product family and last month's cleans. We will show what each option makes and costs.

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