Constantia Flexibles partners Watttron to introduce versatile sealing system for PP cups

AUSTRIA – Constantia Flexibles has teamed up with Watttron to launch a new sealing technology that allows both polypropylene and aluminum lids to secure onto PP cups using one unified setup.

This development extends the company’s existing PPCover, a single-material PP lidding option designed for easier recycling.

The collaboration tackles a key hurdle in production lines: achieving reliable seals across varied lid types without compromising speed or quality. 

Earlier methods often heated the full sealing area, risking lid distortion from uneven temperatures. Constantia Flexibles sought a more controlled process to handle these variations while keeping operations smooth.

Watttron’s solution centers on ring-heating, which directs warmth solely to the lid’s outer edge. This approach cuts down on unnecessary heat exposure and boosts overall efficiency. 

The system ramps up or down temperatures quickly, at 10 to 20 degrees Celsius per second, and holds steady within one degree of the target.

According to Constantia Flexibles, this precision ensures uniform seals every time and lets operators shut off power during pauses, slashing energy use by as much as 50 percent over standard techniques. 

The setup also meshes with full inspection tools to spot and eject flawed cups on the spot, minimizing waste.

Marcus Stein, CEO of Watttron, commented, “We developed our ring-heating technology to deliver precise energy exactly where it’s needed, no more, no less.” He added that it enhances quality and adaptability in packaging workflows.

The partnership aims to streamline factories by ditching the need for multiple machines tailored to lid materials. 

Operators can switch between PP and aluminum options seamlessly, cutting setup times and maintenance demands. 

This could lead to faster throughput and lower costs for food and dairy packagers relying on PP containers.

In a statement, Constantia Flexibles noted the system’s compatibility with mono-material designs supports broader recycling goals, as PP components sort more easily in waste streams.

Early tests show it handles high-volume runs without downtime, making it suitable for large-scale producers.

This innovation arrives amid growing demand for flexible, eco-friendly packaging tools.

Just last week, Siegwerk joined forces with Borouge and TPN to release a recyclable mono-material pouch that upholds strong seal performance for food items, highlighting a wave of similar advances in the sector. 

Meanwhile, Henkel rolled out a fully recyclable heat-seal coating in March, free of mineral oils, to aid direct food contact applications.

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