Changeover time is machine time you are paying for and not producing with. Here is what labeler change parts actually do, where the minutes really go during a size change, and how to build a kit and a routine that gets the line back to speed faster.
Labeler change parts are the format-specific components that have to be swapped when you run a different container or a different label: infeed worms, starwheels, centering bells, container plates, guide rails, and the label-station tooling that matches the new format. A size change is not a repair, so it rarely gets the same attention. That is exactly why it quietly eats production hours. Most of the time lost in a changeover is not spent turning wrenches; it is spent looking for parts, guessing at settings, and running the line at reduced speed afterward while somebody dials it back in.
What Change Parts Actually Do
Every format-specific part on a labeling machine exists to hold the container in a known position at a known time. Get that wrong and the label station is placing a label onto a target that is not where the machine thinks it is.
The container path
- Infeed worm. Sets the pitch and separates containers so they arrive at the starwheel one at a time, evenly spaced. Wrong pitch and everything downstream is fighting it.
- Starwheels and guide curves. Hand the container into the carousel. Worn pockets here are a leading cause of off-register label placement. A worn or mismatched pocket lets the container rock, which shows up later as a crooked label nobody can explain.
- Container plates and centering bells. Hold and rotate the container through the label application. These wear, and worn ones cause slip that looks like a timing fault.
The label path
- Label station tooling. On a Contiroll the cutting and transfer components are matched to label length and material. On a hot melt CanMatic the gluing and transfer geometry changes with the label.
- Magazines and pallets. Sized to the label. Running a label that is close but not correct is one of the most common causes of skewed application after a changeover.
If you are unsure which parts on your machine are format-specific and which are wear items that happen to get replaced during changeovers, that distinction is worth documenting once. It changes what you stock and what you inspect.
Where Changeover Time Actually Goes
When plants time their own changeovers honestly, the wrench time is usually the smallest piece. The larger blocks are these.
Hunting for parts
Change parts that live in a crate in a corner, unlabeled, mixed between formats, cost more time than any single mechanical step. This is the cheapest problem on the list to fix and the most commonly ignored.
Rediscovering settings
If the correct heights, timing marks and pressure settings for each format live in one operator’s memory, every changeover is a re-derivation. When that person is on vacation, the changeover takes twice as long and the first pallet is scrap.
The ramp back to speed
The line is “changed over” long before it is running at rate. Time spent creeping the speed up while adjusting is real changeover time, and it is where worn replacement parts punish you. Parts that are inside tolerance at low speed can be out of tolerance at production speed.
Finding out a part is wrong or worn
The worst version: the format is assembled, the line starts, and the labels are wrong. Now you are troubleshooting under pressure with the line down. Inspecting change parts when they come off, not when they go on, moves this discovery to a moment when it costs nothing.
Building a Change-Part Kit That Holds Up
None of this is complicated. It is just rarely anyone’s job until it becomes a problem.
- One kit per format, physically separated. Not one bin of parts for three formats. Separate, and stored so a part cannot migrate between kits.
- Mark everything with the format, not a part number alone. The person doing the changeover at 2 a.m. is looking for “500 mL round,” not a ten-digit number.
- Store the kit at the machine. Every trip to a storeroom is minutes, and the trips multiply when something is missing.
- Put the settings in the kit. A laminated card with the heights, timing references and speeds for that format, kept with the parts, ends the re-derivation problem permanently.
- Inspect on removal. When a part comes off, check it for wear and either return it to the kit or flag it for replacement. Never put a questionable part back in a kit for a future shift to discover.
- Know your lead times. A worn starwheel you can order in advance is a scheduling item. The same starwheel discovered mid-changeover is a line-down event.
If your change parts have been in service long enough that nobody remembers replacing them, an exchange or remanufacture is usually cheaper than absorbing the downtime they are already costing you.
Changeover Faults and What They Point To
Problems that appear right after a size change almost always trace back to the change itself. Work backward from the symptom.
- Labels crooked or skewed, consistently in one direction. Look at container support and rotation first: centering bell, container plate, and whether the container is fully seated.
- Labels placed at the wrong height. Usually a height setting that was not returned to the format value, or a plate stack that is not correct for this container.
- Intermittent placement errors at speed, clean at low speed. Suspect wear and play. A worn pocket or bearing behaves at 20% of rate and fails at 100%.
- Containers jamming at the infeed. Wrong worm pitch, wrong starwheel, or upstream spacing that no longer suits the new format.
- Glue or transfer faults after a label change. Label material and length changed, so the station geometry, and on glue machines the temperature and application window, need to change with it.
If the same fault returns after you have corrected the obvious causes, stop swapping parts and start diagnosing the machine. Our labeler troubleshooting guide works through faults that are not changeover-related, and repeated failures across formats point to something in the drive or timing rather than the tooling.
When to Bring In a Technician
Some changeover problems are not going to be solved from the plant floor, and the cost of continuing to try is the line staying slow.
- Changeovers that keep getting slower. A creeping changeover time is usually cumulative wear, not operators getting worse at their jobs.
- A format that has never run right. If one format has always been a problem, the tooling for it may never have been correct for your machine’s configuration.
- New format, new tooling. Bringing on a container or label the machine has not run before is worth doing with someone who has commissioned that platform.
- Crew turnover. Changeover is a skill. When the people who knew the machine leave, operator and maintenance training recovers more time than any single part.
Regular inspection catches most of this before it becomes downtime. A preventive maintenance program that includes change-part wear, rather than only the machine’s running components, is what keeps changeover times from drifting year over year. When a change requires hands on the machine, we provide on-site labeling system service and repair across every Krones labeling platform.
Change Part Questions We Get Asked
How long should a labeler changeover take?
There is no universal number. It depends on the platform, how different the two formats are, and how many parts have to move. The useful measure is your own baseline: time your changeovers, and treat an upward trend as a maintenance signal rather than a staffing one.
Do I need OEM change parts, or will aftermarket work?
Change parts are dimensional components, so tolerance matters more here than on many other items. A part that is close but not correct produces placement problems that are difficult to diagnose because the machine reports no fault. We cover the trade-offs in more detail in our comparison of OEM and aftermarket labeler parts.
How do I know when a change part is worn out?
Inspect on removal rather than on installation, and compare against a known-good part from the same kit. Play, egg-shaped pockets, scoring on contact surfaces and any part that needs more force than it used to are all reasons to replace before the next run rather than after a failure.
Can I add a new container format to an existing labeler?
Usually, within the machine’s mechanical range. The answer depends on your specific platform and configuration, so it is worth confirming before you commit to the container. Send us the machine details and the format you want to run and we can tell you what tooling it would take.
Need change parts or help with a format that will not run right? Call 800-391-4867 or request on-site service — parts, rebuilds and repairs on every Krones labeling platform.