Packaging Troubleshooting: Diagnosing Common Failures

Step 1: Classify the Symptom Before You Change Anything

The fastest way to waste money on packaging is to guess at a fix. A crushed corner, a scanner rejection and a leaking bottle have completely different root causes, and swapping board grade to solve a print problem just delays the real answer. Before contacting any supplier, write down exactly what failed, where in the journey it failed, and how often.

A one-line symptom statement like 'bottom panel deforms on pallets above three high' helps a packaging engineer reproduce the issue instead of debating it.

• Structural: dents, corner crush, panel bow, compression failure on the pallet.
• Print and code: barcode scan failures, color drift, smearing, missing panels.
• Closure and containment: leaks, seal peeling, cap back-off, pouch delamination.
• Labeling and compliance: missing required statements, ingredient order questions, net content placement.
• Transit: damage that only appears after carrier handling, not in your warehouse.

Structural Failures: Boxes, Corners and Compression

When a box fails, review its strength rating and packed weight, the internal packing method, and the pallet pattern. UPS publishes box strength guidance listing gross weight, bursting test and edge crush values, and says not to exceed the maximum gross weight on the Box Maker's Certificate, found on the bottom flap of most boxes. Exceeding that limit is a problem to correct, but staying below it does not establish adequate stacking performance or identify the cause of damage. Bursting test and edge crush test measure different properties and are not interchangeable conversions.

Also check whether boxes were reused. UPS packaging guidance advises avoiding reused boxes. FedEx guidance says to remove old labels from reused boxes and make sure the outer box has no holes, tears or corner dents. A box that survived one shipment is not evidence it will survive the next, so we recommend using new boxes when diagnosing damage.

Consider compression, impact and combinations of handling stresses as possible causes. Buckling, punctures and corner dents can help form hypotheses, but appearance alone does not establish the cause. Review stacking conditions, box condition, internal support and cushioning, then use representative testing to evaluate the proposed fix.

• Compare packed gross weight to the Box Maker's Certificate value.
• Confirm the box is undamaged, and preferably new, per carrier guidance.
• For fragile items, the cited carrier guidance recommends double boxing with an outer box about 6 inches larger in each dimension and 3 inches of cushioning around the inner box. Check actual internal clearance against the inner box's external dimensions so box walls and tolerances do not reduce the cushioning space.
• Verify void fill limits item movement; a shifting load turns a strong box into a weak one.
• Change one variable at a time so you can attribute the fix.

Barcode and Print Failures

GS1's troubleshooting guidance identifies several possible causes of barcode reading problems: check digit errors, barcode construction, quiet zone size, bar and background contrast, color choice, symbol size, bar height reduction, wrapping or sealing obstructions, deteriorated code surfaces, and unsuitable positioning, especially on cylindrical packaging.

Work through them visually before reprinting anything. Is there clear space to the left and right of the bars? Did the design reduce bar height to fit a layout? Is the code placed over a curved surface or a sealing weld? Is a shrink wrap or printed border crossing the code? Each of these has a different fix. Many are design or placement changes, though deteriorated print such as flecks or blots may need to be discussed with your printer. A visual check is not a formal barcode verification grade.

A visually dark code is not proof of readability or barcode quality. Contrast, print quality, quiet zones, symbol construction and placement can all matter. If failures happen only at one retail chain, request its barcode specifications and rejection details, including the scanning environment, before redesigning. This guide does not supply that retailer's exact requirements.

• Check quiet zones on both sides of the symbol.
• Confirm bar height was not reduced to squeeze the code into a layout.
• Verify the code is not crossed by shrink wrap seams, welds or printed borders.
• On bottles and tubes, review symbol orientation, size and placement for the curvature and intended scanning process, using the applicable GS1 and retailer specifications.
• Inspect printed samples for flecks, blotches or wrinkling in the code area.

Leaks and Closure Failures

For liquid products, carrier guidance is direct: position bottles upright, use an inner seal and perforated breakaway cap, and make sure the inner packaging can contain leaks. If a leak complaint arrives, check whether the inner seal was applied at the correct temperature and dwell time, whether the cap torque was consistent, and whether the secondary packaging would actually contain a leak if one occurred.

For pouches and flexible packaging, common areas to review with your converter are heat, pressure and dwell settings at the sealing station, and contamination in the seal area such as product residue. As a practical recommendation, test sample seals from each production run using a method agreed with your supplier, and keep the samples.

If the product is regulated for child-resistant packaging, note that CPSC does not approve, certify or endorse any specific packaging, manufacturer or testing firm, and it is the finished product manufacturer's responsibility to select packaging suitable for their substance and ensure compliance. A closure that tests well in isolation can still fail compliance if applied incorrectly on your filling line, so build a verification step into your own process rather than assuming the supplier's data transfers to your line.

Labeling and Compliance Symptoms

Label problems often surface as retailer rejections or customer complaints rather than physical failures. The required elements, such as responsible party, net contents, ingredient statements and prominence rules, depend on the product category, market and channel. This guide does not cite the governing regulations for any category, so confirm the specific requirements from the regulator's own guidance or with your regulatory advisor.

One frequent confusion is which container must carry the required information, for example an outer carton versus the bottle or jar inside it. When troubleshooting a labeling rejection, first confirm with your advisor which container counts for your product under the applicable rules, then check each required element against it.

Because labeling obligations vary by product category and channel, treat this as a review workflow: list every required element, confirm the governing rules for your specific product with your regulatory advisor, and verify placement on the actual printed proof, not the design file.

A Worked Diagnostic Example

Consider a purely hypothetical scenario. A candle shipper receives damage complaints on about one in twenty parcels. Each parcel has external shipping dimensions of 12 by 12 by 10 inches and holds four small glass jar candles arranged two by two, with bubble wrap between jars. Jar dimensions, usable box dimensions and cushioning thicknesses have not yet been measured, so this layout is not a validated packing design.

First, estimate the chargeable weight to understand the shipping context. Multiply 12 by 12 by 10 to get 1,440 cubic inches. Divide by 139, the divisor in FedEx's published general guidance, to get a dimensional weight of about 10.4 pounds. If the actual packed weight is 9 pounds, the dimensional weight is the greater of the two and sets the chargeable weight. Rounding rules and divisors can vary by carrier, service and account, so confirm them in your own agreement. This is an arithmetic estimate for cost planning only, not a validation of anything physical.

Now investigate the damage. The hypothetical packed parcel weighs 9 pounds in a single-wall box. Chipped or cracked glass on adjacent jars makes item movement or contact worth investigating, but does not rule out compression or other causes. Measure the jars, usable box interior and cushioning in the packed sample. UPS recommends at least two inches of appropriate cushioning between items and between items and the container's corners, sides, top and bottom. For two cylindrical jars across a row, a hypothetical layout allowing those clearances needs at least two jar diameters plus six inches of usable width; repeat the check for depth and allow cushioning above and below the jars. Dividers may help separate jars but do not by themselves establish adequate cushioning. If the layout lacks room, evaluate a larger box or another packing design, including the cited fragile-item double-box guidance. Select and test changes based on the evidence, changing one variable at a time where practical.

These numbers are illustrative for the exercise only, not a quote, market benchmark or test result.

Decision Table: Symptom to First Check

Use this table to route a symptom to its most likely first check. It is Teal Packaging's editorial troubleshooting framework, not a substitute for testing.

Troubleshooting Checklist

This checklist is Teal Packaging's editorial planning framework. The cited sources cover only specific underlying principles such as carrier packing guidance, GS1 barcode checks and CPSC's description of its own role, not the checklist itself.

• Write a one-line symptom statement before changing anything.
• Note where in the journey the failure appears: production, warehouse, transit or retail.
• Compare packed weight to the box certificate rating.
• Confirm boxes are new, with no dents, tears or old labels.
• Verify cushioning thickness and void fill on a packed sample, not the spec sheet.
• Scan-test barcodes from a printed sample at the intended angle.
• Check quiet zones and confirm bar height was not reduced.
• For liquids, confirm upright orientation, inner seals and leak containment.
• List required label elements and confirm with your advisor which container must carry them.
• Change one variable at a time and record the result.
• Distinguish your own arithmetic estimates from actual validation or testing.

Scope and Limits

This guide covers diagnostic method for common packaging failures. It does not determine regulatory compliance for any specific product, does not certify child-resistant performance, and does not replace transit testing, seal testing or a formal barcode verification grade. Carrier rules cited here reflect published general guidance; confirm the specific requirements in your own carrier agreement and retail channel agreement, since surcharges, size limits and labeling rules can differ by service and account. For hazardous materials, cold chain or restricted products, work with qualified advisors rather than general troubleshooting articles. Product pricing is quoted per project; Teal Packaging's standard minimum is 50 units, or 100 for specialty rigid, and Teal does not charge setup, plate or tooling fees.

Questions about packaging troubleshooting