How to Reduce Changeover Time Between Product SKUs

Why Changeover Time Matters More Than You Think

Most production planning models assume changeovers take a fixed time based on past averages. The actual cost is usually underestimated for two reasons: changeover duration increases as machines age (worn adjustments become harder to set precisely) and frequency increases with SKU proliferation (more product variants = more switches per week).

The compound effect: a line that spent 8% of its time on changeovers in year one may spend 15% by year three as SKU count grows and machines require more fettling. This directly reduces effective production capacity without appearing in equipment utilisation reports — because the machine is technically running during the slow start-up and settle period that follows each changeover.

Common Changeover Bottlenecks

A structured time study of your existing changeovers will reveal which activities consume the most time. The most common bottlenecks are:

• Fill head adjustment: Setting and verifying fill volume on each head after a volume change. On machines without servo adjustment, this requires manual screw adjustment on each head followed by a fill-weight verification run. A 16-head filler may require 2–3 fill-weight check runs before all heads are in specification.
• Nozzle and format part changes: Swapping filling nozzles, capping heads, conveyor lane guides, and starwheels for a different container format. Each involves tool use, adjustment, and re-verification.
• CIP (Cleaning-in-Place) cycle: The cleaning cycle between products (especially between allergen or flavour variants) is non-negotiable in terms of hygiene, but duration is often dictated by machine design rather than cleaning science. Automated CIP with validated cycle times is significantly faster and more reliable than manual cleaning.
• Flushing and product changeover: Removing the previous product from supply lines, tanks, and nozzles before the next product can enter.

What to Look for in Machine Specifications

When buying new equipment, these design features directly determine changeover time:

• Servo-driven fill volume adjustment: Recipe-based, operator-interface controlled. Change fill volume for all heads simultaneously from the HMI panel — no manual adjustments, no verification runs.
• Tool-less format parts: Quick-release starwheels, clip-on lane guides, and snap-fit infeed components that change without wrenches. Verify this claim during FAT — some suppliers call something "tool-less" when it still requires loosening a clamp bolt.
• Dedicated format sets: Each SKU family has a named, numbered set of format parts stored together. Operators retrieve the set, not individual components. This eliminates assembly errors and reduces search time.
• Automated CIP: Programmed cleaning cycles with verified temperature and detergent concentration monitoring. Faster, safer, and auditable compared to manual cleaning.

Practical Targets

What is achievable? For a modern filling and capping line with servo adjustment, tool-less format parts, and automated CIP:

• Volume change only (same container): Under 5 minutes to stable production
• Container and volume change (same product family): 15–25 minutes including format part swap and first-article verification
• Full product change with CIP: 45–90 minutes depending on line complexity and cleaning cycle validated time

If your current changeovers are significantly longer than these benchmarks, the gap is almost always recoverable through machine upgrade or operational process improvement — not by expecting operators to work faster.

The most cost-effective sequence is: first, measure actual changeover time by activity (video your next three changeovers and categorise every minute). Then, attack the two or three activities that account for the majority of time. In most cases, that points to either servo fill adjustment upgrade or automated CIP implementation.