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Shrink Sleeve Distortion: Film, Artwork and Tunnel Review
Separate sleeve-placement errors from shrink-process distortion and verify final appearance, information readability and bottle condition.
What to establish first
Review sleeve material, artwork compensation, container geometry and the actual tunnel process as one system. Distortion can begin at sleeve placement or develop during shrinking, so compare both stages before changing the tunnel.
Three checks before a change
- Confirm film, layflat dimensions, cut length, artwork and approved container sample. Record supplier revision and trial conditions.
- Compare sleeve position before shrinking with the final result. Observe material and container behaviour under the normal guarded procedure.
- Ask the sleeve and tunnel specialists to assess the approved process window. Verify placement, appearance and package behaviour across the intended formats after any supported change.
Interpret the observed pattern
| Observed pattern | Next review |
|---|---|
| Position is already wrong before shrinking | Review sleeve placement and orientation with the approved format. Keep this separate from tunnel changes so a pre-existing position fault is not masked. |
| Distortion develops in the tunnel | Compare material lot and actual shrink/conveying records with the first affected samples. Let the material and equipment owners define the supported trial. |
| Graphic looks acceptable but code cannot be read | Treat readability as a separate acceptance result. Verify the final package and the required information, not only the sleeve’s overall appearance. |
Evidence to record
Use these fields as a worksheet. Keep individual results and comparison samples; an overall average alone may hide the affected condition.
| Record item | Required evidence |
|---|---|
| Film and artwork revision | Identify the exact format, lot and document revision; attach a representative sample or record. |
| Container and sleeve dimensions | State the location, method, instrument and operating condition so a comparison can be repeated. |
| Pre-shrink position | Link the observation to an individual sample and a common timestamp; retain both normal and affected cases. |
| Tunnel trial and final samples | Record the approved assessment, action, verification result and responsible person; keep unresolved items visible. |
Controlled trial and acceptance
Agree the observation, affected boundary and acceptance method before starting a trial. Identify the product-package combination, approved settings and responsible equipment or quality owner. A test must have a clear question and a controlled disposition for trial material.
Compare the existing and proposed condition with identified samples using the same measurement basis. Change only what the responsible owner has authorised. Include the relevant steady-running, stop or restart case; one passing sample does not establish repeatable operation.
Keep results, samples and configuration revisions together. Record what passed, what remains open and the exact approved scope. If a correction moves the defect to another process step or compromises another acceptance requirement, retain that result and continue the assessment.
Common question
Can tunnel adjustment correct every artwork distortion?
Not necessarily. Material characteristics, artwork and placement need their own review. Correcting the process cannot automatically compensate for an unsuitable sleeve design.
Technical reading
The linked manufacturer material provides engineering context. This worksheet is an independently written diagnostic framework; the installed equipment’s approved instructions and the site’s product acceptance determine the actual procedure and limits.
China Beverage Machinery is operated by Allot Tech (Suzhou) Co., Ltd. for machinery sourcing, configuration planning and export project coordination.