Packaging failure investigation

What the Symptom Checker Does

The Packaging Symptom Checker is a troubleshooting checklist. You select the symptom you have observed, identify the affected lot or sample, and state whether the problem reaches across multiple lots. It returns three rows: possible causes, next evidence, and investigation scope. It does not inspect samples, score severity, or name a root cause. Use the output to decide what to record before anyone adjusts a process or changes a material.

Selecting the Observed Symptom

The Observed symptom field is a select with five choices: Label edges lifting, Pouch seal leaking, Carton crushing, Print color mismatch, and Barcode unreadable. Pick the physical observation, not the suspected cause. If label edges are lifting, select that symptom even if you suspect the adhesive; the tool lists adhesive and facestock compatibility among possible causes but does not confirm it. One symptom is routed at a time. If several defects appear together, run the checker separately for each and keep the same lot reference.

Recording the Lot Reference and Filing the Output

The Affected lot or sample reference field is free text and defaults to Unassigned. It accepts a lot code, batch number, sample ID, or any label your team uses to trace the material. The value identifies the case but does not change the causes, evidence step, or scope row. Use a consistent format so the checklist attaches to the correct manufacturing record. If you leave it as Unassigned, the output still routes correctly, but the saved result is harder to file.

Save the three rows with the lot reference and the spread answer so the path taken is visible. If the investigation later moves to a different symptom, record that second run rather than overwriting the first. That keeps the sequence of evidence requests auditable and makes the retained-sample comparison easier to reconstruct.

Single Lot and Multi-Lot Scope

The spread field asks whether the problem affects multiple lots, with No and Yes options. With No, the investigation scope reads Start with the affected lot and a retained control, directing attention to a known-good retained sample. With Yes, the scope reads Compare common material and process conditions across lots. A multi-lot symptom points away from a one-off deviation in a single batch and toward shared inputs: incoming material, process settings, handling, or storage conditions common to the lots. Do not assign fault before comparing the approved specification, retained samples and manufacturing records.

Reading the Possible Causes Row

The Possible causes row lists mechanisms plausible for the selected symptom. These are prompts for what to examine, not findings. For Pouch seal leaking, the list covers seal contamination, incompatible seal settings, film damage, and channel formation. Those point toward seal-area inspection, setting records, film handling, and seal geometry rather than an automatic verdict. Read the row as hypotheses to eliminate in order. Where a cause can be checked with existing records, such as seal temperature, pressure and dwell, check there first.

Collecting the Next Evidence

The Next evidence row names the record or sample to collect next. For label edges lifting, it asks for substrate resin, application temperature, cleaning, pressure and dwell, plus a material sample test. For pouch seal leaking, it asks you to quarantine affected stock, preserve samples, and log temperature, pressure, dwell and filling conditions. Collect evidence before changing settings. Once a process is adjusted, the original condition is lost and the comparison weakens. The tool does not specify test standards, sampling plans, or acceptance limits.

Two Worked Cases

Case one: symptom Label edges lifting, spread No. The causes row lists adhesive or facestock incompatibility, curvature, contamination or application conditions. The evidence row directs you to record substrate resin, application temperature, cleaning, pressure and dwell. The scope row sends you to the affected lot plus a retained control. Case two: symptom Pouch seal leaking, spread Yes. The causes become seal contamination, incompatible seal settings, film damage or channel formation. The evidence step is to quarantine affected stock, preserve samples, and log temperature, pressure, dwell and filling conditions. Because spread is Yes, the scope row compares common material and process conditions across lots.

An Edge Case and Limits

Suppose a crushed carton appears on one lot, but the pallet was stored wet and overhung the base. As an investigation example, collect case weight and stack duration before simply increasing board grade. This is practical context, not a quotation of the checker's returned evidence row. A wet or overhanging pallet can defeat a stronger dry-board specification, so a board upgrade alone may not address the failure. The checker is a troubleshooting checklist, not a root-cause determination. Suspected food-safety or product-contamination issues require the responsible quality team. Nothing here certifies a pack, sets a safe load, or provides a legal determination.

Questions about packaging failure investigation