Define what can change
List the product features that could soften, deform, discolour, migrate, release pressure, lose adhesion or move. Include any quality limit that may not be visible immediately at the tunnel exit.
Application guide
Can heat-sensitive products be shrink wrapped?
A product-specific framework for deciding whether the pack, contents, labels, closures and film can tolerate a controlled shrink process.
Product assessment
Heat-sensitive products require a pack-level trial, not a temperature guess
A heat-sensitive product may still be suitable for shrink wrapping, but the product, contents, container, closure, label, adhesive, coating and film must remain acceptable through sealing, heating, cooling and downstream handling. Lower indicated temperature is not automatically safer if it requires longer exposure.
Use production-condition samples
Filled and empty containers can behave differently in weight, stability and heat response. Use the condition that will be sold or handled, plus the highest-risk variants.
Control exposure, not one set point
Assess indicated temperature, actual speed, airflow, pack spacing, product starting condition and the number of packs in the heated zone together.
Approve cooling and later checks
Define the condition at discharge and any delayed inspection needed for labels, adhesives, coatings, closures, contents or pack shape.
Evidence to include in a heat-sensitivity trial
- Product and container specification, fill condition, closure and label construction.
- Known temperature or handling restrictions supplied by the product, container, label and film providers.
- Smallest, largest, lightest, heaviest and most sensitive variants.
- Production film identity, seal method, actual conveyor speed, airflow and product spacing.
- Immediate pack inspection and any agreed delayed product or adhesion check.
- Accepted sample, reject limits and the person authorised to release the result.
Common questions
Questions about shrink wrapping heat-sensitive products
The answer depends on the complete pack and exposure, so representative evidence is more useful than a generic material name.
Can a heat-sensitive product be shrink wrapped?
Possibly, but suitability must be demonstrated with the actual product, pack components, film and proposed machine process. The accepted result may depend on a short controlled exposure, airflow distribution, product orientation and rapid cooling.
Where the product or packaging supplier states a limit, use that information as an input to the trial rather than assuming the film setting is the only constraint.
Is a lower shrink-tunnel temperature always safer for the product?
No. A lower set point may require slower travel or longer exposure to activate the film, which can increase total heat absorbed by the product. Conversely, a high short exposure can create surface damage or uneven shrink.
Assess the combined time, temperature, airflow, loading and cooling condition with the real pack.
Should heat-sensitive container trials use filled or empty samples?
Use the production condition that creates the real weight, centre of gravity, pressure, heat capacity and stability. If both empty and filled containers will be processed, test both because they may need different presentation or recipes.
Use safe and authorised sample contents and identify any product-specific handling requirements before the trial.
Can labels, inks or adhesives be affected by shrink heat?
Yes, they can be part of the heat-sensitive pack even when the product itself is stable. Possible effects include movement, lifting, print distortion, softening or surface marking. The exact response depends on the materials and exposure.
Include the production label, print and adhesive in the trial and inspect after the pack has cooled, not only at tunnel exit.
How should product condition be accepted after shrink wrapping?
Write measurable or observable acceptance criteria before the trial. These may include shape, closure position, label adhesion, surface finish, contents condition, pack dimensions and performance at the next handling stage.
Where a change may be delayed, agree an inspection interval and retain controlled samples from the trial.
What samples are needed for a heat-sensitive shrink-wrapping trial?
Provide the most sensitive production-condition variants, complete with real containers, closures, labels, adhesives, contents or safe equivalents and the intended film. Include supplier information for any known heat restriction.
Supply enough samples to establish the process and then run a representative sequence after the machine has reached its stable production condition.
When is another packaging method more suitable than shrink wrapping?
Another method should be considered when the product or pack cannot tolerate the heat exposure needed to activate the film, when the accepted barrier cannot be created by the selected seal pattern, or when the required format cannot be presented safely and repeatably.
A controlled trial can establish that boundary before equipment is committed.
Product trial
Send the complete heat-sensitive pack, not only the outer dimensions
Provide the product, contents condition, container, closure, label, adhesive, film and known material limits so the proposed process can be tested against the real risk.