Roll die cutting register control should be evaluated on identified print-to-cut samples. A misplaced cut can involve the printed reference, web transport, detection or the cutting setup. The first useful question is how the error behaves: fixed, drifting, intermittent, lane-specific or associated with a defined transition. Preserve that pattern before changing tension or a register setting.
Confirm the roll, artwork and cutting reference
Record the printed roll, material lot, artwork and dieline revisions, tooling and approved job setup. Identify the register marks required by the actual machine process. Do not assume that every mark visible in a design is intended as the machine's detection reference.
Use the artwork registration checklist to compare the printed reference with the approved cut outline. Keep flat samples from the relevant positions. A correctly displayed image file does not establish that the printed roll matches the approved production reference.
Describe direction and repeatability
Mark machine direction, cross-web position and sample order consistently. Identify where the cut lies relative to the graphic or reference feature. Preserve both the acceptable and affected pieces, including their production context.
| Pattern | Evidence to collect | Investigation question |
|---|---|---|
| Fixed offset | Comparable samples at the same job condition | Are reference and setup definitions correct? |
| Gradual drift | Ordered samples and operating state | Does the change follow a transport or roll condition? |
| Intermittent error | Time and event history | Is there a repeatable detection or handling event? |
| One lane affected | Cross-web locations | Is the pattern local or common across the web? |
| Change near a splice | Roll and splice reference | What changed at that material boundary? |
These patterns narrow an investigation; they do not independently identify the cause. Do not report a tension problem solely because the cut moves in the machine direction.
Check the actual web-control arrangement
Use the machine documents to identify unwinding, guidance, detection and register functions actually fitted. Different cutting configurations need different procedures. Obtain permitted setup values and adjustment methods from the responsible supplier rather than adopting a competitor's numerical specification.
Threading, roll access and inspection near cutting or nip points require the approved safe-work procedure. Qualified personnel should establish the required isolated condition before guarded access. Do not reach into a moving web path, hold the web by hand or disable a protective device to observe tracking.
Record relevant condition before intervention. Confirm material and sensor references, and use the authorized procedure to review a suspected component issue. The fan blank inspection guide helps connect cut-part geometry and edge condition with downstream forming suitability.
Verify a controlled blank trial
After authorized work and required protective checks, compare new samples using the same measurement reference. Include the operating conditions agreed for acceptance rather than selecting only an attractive sample from steady operation. Record which conditions were tested and which remain unassessed.
Check cut geometry, artwork placement and delivery condition together. Good register does not independently prove acceptable edges or consistent blank separation. Retain the trial record with material, tooling and setup revisions so a repeat order can use the same reference.
Contact HANNAI with the printed layout, material specification and labeled error samples. Review the die-cutting equipment and Products page with actual forming-line requirements before confirming the conversion route and trial scope.
Frequently asked questions
Does every drifting cut prove a tension fault?
No. Compare printed references, transport conditions, detection and setup using the actual machine procedure.
Should samples be labeled by web direction?
Yes. Consistent orientation and sequence make the error pattern comparable across people, lanes and production stages.
Can another machine's register tolerance be adopted?
Use the requirement agreed for the actual product and equipment. An advertised value from another configuration is not an acceptance specification.
What belongs in the acceptance trial?
Identified material, approved drawings and tooling, defined operating conditions, print-to-cut results and the relevant blank-quality checks.