TL;DR
Torque variation means closures are not being applied consistently. Inspect spindle clutch, closure guides, and calibrate the torque sensor before re-running.
What you might see
- closure torque values scattered outside specification
- caps loosening in the distribution chain
- capper spindle not engaging closure fully
- torque sensor readings erratic
Likely causes
Spindle clutch wear or contamination causing torque slip
Closure guide misalignment causing the cap to feed off-center to the spindle
Torque sensor drift or damage from cleaning chemical ingress
Closure batch inconsistency, dimensional variation from the supplier
Required tools
- Calibrated torque gauge
- LOTO kit
- Replacement spindle insert
- Calibration standard
Safety first
- Capper spindles and star wheels have pinch points. Lock out the drive before inspecting or adjusting any spindle component.
- Closures from the supply hopper may be contaminated. Do not return closures dropped on the floor to the infeed hopper.
Procedure
- 1
Collect a sample of 20 closed containers and measure final torque with a calibrated torque gauge.[1]
- 2
Lock out the capper drive and product supply.[1]
- 3
Inspect the spindle rubber insert or clutch for wear, cracking, or product contamination. Replace if worn.
- 4
Check the closure infeed chute for skewed or deformed closures from the supply hopper.
- 5
Verify the closure guide height and position. A misset guide causes the cap to be off-center when the spindle engages.
- 6
Calibrate the torque sensor using a certified torque standard. Document calibration per site quality procedure.
- 7
Run a 20-closure torque audit after any correction. Release production only after the audit passes.
Sources
Krones Krones Modulfill / Volumetic Filler / Capper general technical documentation, Krones
Krones Modulfill / Volumetic capper general torque control and spindle maintenance procedures (general)
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