In many bottling lines, capsuling is considered a “simple” process - until it stops being one.
Folding defects, perforation, slight aesthetic inconsistencies: issues that over time lead to waste, rework, and, if not corrected, a perceived loss of product quality.
The reality is that most capsuling defects do not originate from the capsule itself, but from a combination of interacting factors across the bottling line, equipment and bottle specifications.

We asked our wine and spirits Field Technical Services team what types of troubleshooting they encounter in the field.

Here are the 4 most common (and often invisible) causes of capsuling issues they see.

1. Wire cages and capsule positioning

Wire cages can significantly influence hood positioning during application, especially with short-skirt hoods. Improper alignment may lead to off-center capsules, wrinkles or even breakages.

When these issues occur, the root cause is frequently related to how the wire cage is positioned on the bottle.

Key insight: If capsule issues occur, check for misalignment between the cage and bottle to first rule this out as a root cause. Pre-crimping for short hoods helps stabilize placement and improves centering consistency.

2. Bottle variability

Not all bottles are identical. Even minor variations in neck diameter, glass finish, or concentricity can lead to irregular wrinkling, poor adhesion and off-center capsules.
When defects appear intermittently, the root cause is often unnoticed variation in the glass itself rather than the capsule or machine.

Key insight: The hood must be always be matched to the bottle dimensions. If you are considering a bottle change, reach out to our team beforehand to learn how your capsule should adjust.

3. Non-optimized machine parameters

Capsuling performance is highly sensitive to machine settings such as speed and centering. Even small deviations can compromise final results, leading to uneven folds or inconsistent application.

Key insight: Any increase in bottling line speed requires process adjustments. The production rate also depends on the type of head used in the crimping process. For example, pneumatic bad heads allow a faster bottling speed than pneumatic jaw heads. Check that the machine settings comply with the technical specifications for the capsule. If you are unsure if the machine settings are correct, our team can help.

4. Component wear and tear

Mechanical elements on the bottling line, such as heads (rubber pocket) and guides degrade over time. This can result in uneven pressure distribution, inconsistent contact during application and recurring unexplained defects.

Key insight: The machine parts most likely to negatively impact hood application are the guides and application heads (pouch and rubber jaw). Check high-wear components on your bottling line before the bottling process, following the maintenance schedule recommended by the manufacturer.

Technical support from design to shelf – why it matters

Great capsuling is not the result of a single perfect component, but of a system working in balance - where materials, machinery, and process parameters are fully aligned.

This is where the difference between a packaging supplier and a true technical partner becomes clear: anticipating issues, identifying risks early, and solving problems before they impact your production.

With Amcor, you gain access to our global Field Technical Service team of specialists, ready to support your wine capsuling operations both remotely and on-site, from line set-up and optimization to troubleshooting, spare parts supply and training.

Planning your next production run?

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