Flexible Packaging Failures: Common Causes and How Converters Can Prevent Them
Flexible packaging continues to grow across industries, but with that growth comes increased complexity. As materials evolve and performance expectations rise, failures are rarely caused by a single issue. More often, they stem from misalignment across materials, adhesives, equipment, and process conditions. For converters, even small inconsistencies can lead to downtime, rejected product, and missed timelines.
As the exclusive U.S. distributor of Henkel’s flexible packaging adhesives and coatings, APPLIED Adhesives helps converters optimize performance across the entire packaging system, from material selection through production scale-up. Below, we break down the most common causes of flexible packaging failure and how to prevent them.
Material and Structure Mismatch
Packaging structures must align with product requirements, barrier needs, and processing conditions. Different substrates respond differently to heat, tension, and adhesive systems, and those differences matter.
Common signs of mismatch include:
- Poor barrier performance
- Curling or distortion
- Inconsistent sealing
A common issue is running new materials on legacy machine settings. Without adjusting tension profiles, seal temperatures, or adhesive selection, even well-designed materials can underperform.
Printing and Surface Defects
Surface quality affects both appearance and performance.
Common flexible packaging defects include:
- Ink smearing or scuffing
- Color inconsistency
- Pinholes or halos
- Ink transfer issues
These issues are often tied to:
- Low film surface energy
- Poor viscosity or pH control
- Contamination
- Inadequate drying
- Incompatible primers or coatings
- Excessive line speeds
As films become more specialized, tighter control over pretreatment and printing processes is essential.
Adhesive and Lamination Failures
Lamination performance depends on both adhesive chemistry and process control. When bonding fails, converters may experience:
- Low bond strength
- Layer separation
- Full delamination
These failures are typically linked to incorrect adhesive selection, improper mix ratios, insufficient cure time, or inconsistent coat weights.
Heat or Cold Seal Coating Integrity Issues
Seal integrity is one of the most critical areas in flexible packaging. As films evolve, seal windows are becoming tighter, leaving less room for variation, especially at higher line speeds.
Heat or cold seal failures are often caused by:
- Incorrect temperature or pressure
- Inadequate dwell time
- Uneven heat distribution
- Improper web tension
- Material incompatibility
Seal integrity issues directly impact product protection, shelf life, and customer confidence.
Gaps in Trialing and Scale-Up
Many packaging failures begin during development, not production.
A typical pattern:
- New material is introduced
- Minimal process changes are made
- Performance falls short
- The material is replaced
The issue is often incomplete optimization under real-world conditions. Without structured trial protocols, this cycle continues and can slow innovation and increase costs.
Compliance and Regulatory Gaps
Regulatory requirements add complexity, especially in food-contact applications.
Common compliance-related failures include:
- Incomplete compliance reviews
- Missing documentation
- Insufficient validation
These issues can delay launches, increase liability, and lead to potential recalls.
Supplier Misalignment
Flexible packaging is a multi-supplier ecosystem. Success depends on coordination between film suppliers, adhesive providers, coating manufacturers, equipment OEMs, and converters.
Misalignment in expectations or capabilities increases the risk of failure.
Early supplier collaboration leads to faster, more stable production outcomes.
How to Prevent Flexible Packaging Failures
Most flexible packaging issues are preventable with a structured, system-wide approach.
1. Define Requirements Early
Establish clarity around:
- Product and application needs
- Barrier requirements
- Filling and sealing conditions
- Storage and distribution environments
- Regulatory considerations
2. Design as a System
Flexible packaging performance depends on compatibility across all components, including films, adhesives, coatings, and inks. They all must work together under real operating conditions.
3. Validate Under Real Conditions
Testing should reflect actual production environments, including line speed, environmental exposure, and process variability. Evaluate:
- Seal strength
- Bond integrity
- Print adhesion
- Overall package performance
4. Optimize Process Parameters
Even the best materials require precise processing. Focus on:
- Temperature
- Pressure
- Dwell time
- Web tension
- Line speed
Fine-tuning these variables ensures consistent, reliable performance.
5. Test Before Scale-Up
Before full production, confirm:
- Seal integrity
- Bond durability
- Environmental resistance
Skipping this step often leads to costly issues at scale.
A Smarter Approach to Flexible Packaging
Flexible packaging failures aren’t inevitable, but avoiding them requires the right combination of materials, expertise, and process optimization.
Through our partnership with Henkel, APPLIED Adhesives supports converters with adhesive and coating solutions, technical troubleshooting, structured trial support, and process optimization. The result is faster scale-up, fewer failures, and more consistent production.
Need Help Troubleshooting Flexible Packaging Issues?
Whether you’re evaluating new materials or optimizing an existing process, our team can help you reduce risk and improve performance.
Contact APPLIED Adhesives today to get started.
FAQs
What is the most common cause of flexible packaging failure?
Flexible packaging mistakes and failures can occur for multiple reasons. A common cause is a mismatch between the materials and the processing conditions. When systems aren’t optimized together, failure is common.
How can seal integrity issues in flexible packaging be reduced?
Seal integrity problems can often be reduced by controlling temperature, pressure, dwell time, and material compatibility while maintaining consistent machine settings throughout production.
Why do sustainable materials fail more often during trials?
Many sustainable materials have narrower processing windows and require tighter control and validation.
When should testing occur in a packaging project?
For best results, testing should occur throughout the lifecycle, including during material selection, development, process optimization, and pre-production.
How can converters improve trial success rates?
Converters can improve trial success by using structured testing procedures, involving suppliers early, validating under real-world conditions, and adjusting process variables systematically.