Krones Contiroll Parts, Rebuilds and Service

The vacuum drum is the heart of the machine

Everything the Contiroll does depends on the drum holding the web exactly where it is supposed to be, from pickup through cut through transfer. When vacuum goes soft or uneven, labels drop, the cut lands in the wrong place, and placement wanders. Operators tend to blame the label stock first. It is usually the drum.

What goes wrong

• Blocked or partially blocked ports. Adhesive, paper dust and film debris accumulate in the vacuum path. Partial blockage is worse than total blockage because the fault becomes intermittent and speed-dependent.
• Surface wear and scoring. A drum face that is no longer flat and true does not seal against the web, so vacuum bleeds off where it should hold.
• Seal and bearing wear. Internal wear lets vacuum leak inside the assembly, which shows up as a drum that reads fine at rest and fails under load.
• Pump and line condition. Before condemning the drum, verify the vacuum source. A tired pump or a collapsed hose produces identical symptoms and costs far less to fix.

Rebuild rather than replace

A worn vacuum drum is a rebuild candidate in most cases. Ports get cleared, the surface gets brought back true, and seals and bearings are replaced. A rebuilt drum typically costs a fraction of a new assembly and holds the same tolerances.

Cut quality determines seam quality

The Contiroll cuts each label from a continuous web, so the cut is not a finishing step, it is the step that defines the label. A dull or nicked blade, or a cutting drum that has drifted out of clearance, produces ragged edges, feathering, and vertical seams that will not lie flat no matter what you do to the glue.

Symptoms that point at the cutter

• Torn, feathered or fibrous leading and trailing edges
• Labels cut long or short by a consistent amount
• A seam that opens on one side of the container but not the other
• Cut quality that degrades as the shift goes on and the machine warms

Blades are consumables. Cutting drums are rebuildable, and the rebuild is largely a clearance and surface job. If the blade has been changed and the cut is still poor, the clearance has moved.

Glue rollers, pots and temperature control

Roll-fed hot melt is unforgiving about film consistency. Too little adhesive at the leading edge and the label never anchors. Too much anywhere and it squeezes out, contaminates the drum, and starts the vacuum problem described above. A glazed, grooved or hardened glue roller cannot lay down an even film regardless of what the temperature controller says.

Glue pots are one of our core exchange items. Pots come back with new heating elements and precision surfacing, so you get consistent viscosity instead of the slow drift that produces stringing. The same wear pattern and the same fix apply on Canmatic and other hot melt aggregates.

Reel handling, splice units and web tension

A roll-fed machine only runs continuously if the splice works. Splice failures and tension faults tend to be dismissed as operator error, and sometimes they are, but worn reel holders, tired dancer components and slipping tension control produce the same result far more reliably than people do.

• Failed splices at reel change. Check the splice unit clamping surfaces and the tape or bonding method before retraining the operator.
• Tension that varies through the reel. A web that is tight at the start and loose at the core will cut inconsistently at both ends.
• Weaving or tracking off-center. Guide roller wear and shaft alignment, usually. This puts the label on the container crooked, which is often mistaken for a centering problem downstream.