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Tinplate packaging: spray can

Tinplate packaging: the spray can is getting lighter

rasselstein® Solidflex is the latest innovation by Packaging Steel for producing tin can packaging that is lighter, more stable, safer, and more sustainable in the future.

© photo: Shutterstock

Development of the new premium material rasselstein® Solidflex began a few years ago – and it has finally been greenlighted for series production. We have summed up this new material’s primary advantages under three headings:

1. An innovative material

The thyssenkrupp Packaging Steel business unit has developed a quality steel in rasselstein® Solidflex that will transport conventional steel packaging into the future. rasselstein® Solidflex is an extremely strong material that also boasts very good forming properties. Thinner material thicknesses can be used, while stability remains consistent.

Pull-tabs make it possible to open cans without tools.
Who needs a can opener? The practical pull-tab lid makes opening cans by hand a breeze. © Getty Images

This property is particularly important in the production of food cans that are opened using a pull tab. The “rivet” is what is essential here. This component connects the lid to the pull tab and should not detach as soon as you pull it. At the same time, the packaging steel has to be malleable and pliable enough for the rivet to be formed from the very same piece of material as the lid and for the lid to be effortlessly pulled from the can. This means that the material has to be both solid and flexible – or in other words, “Solidflex!”

2. A safe material

Alongside the aforementioned cans for foodstuffs with “easy-open ends,” rasselstein® Solidflex is particularly suitable for manufacturing aerosol cans. The specially designed bottoms and lids of spray cans are ideal applications for this material.

The material rasselstein® Solidflex is especially suitable for the lids of aerosol cans, which are also referred to as “domes.”
rasselstein® Solidflex is particularly suitable for reshaping the lid of aerosol cans, also known as “domes.” © Marco Rothburst

From deodorant and hairspray, to spray bottles for perfume and room scents, right through to spray foam for ovens and acrylic paint for furniture and cars – tinplate packaging is an essential part of everyday life. However, manufacturers may only bring aerosol cans on the market under special conditions according to EU law. Depending on the product that is being sold, it stipulates the exact pressure the spray can has to ensure before it “fails.”

This “deformation pressure” is desirable, as it serves as a warning for the consumer. It can be seen from the lid and bottom of the can slowly – but safely – bulging outward. This means that you don’t have to worry about cans exploding, as the consumer’s safety takes top priority.

Spray cans made from rasselstein® Solidflex are lighter than conventional aerosol cans.
The material rasselstein® Solidflex is especially suitable for the lids of aerosol cans, which are also referred to as “domes.” © Shutterstock

3. A sustainable material

rasselstein® Solidflex is considerably stronger than the material that has been used for spray cans up to this point. Its expansion behavior is different from conventional material. Its incredible strength makes its components more stable and means that they can be produced from thinner material. This allows more cans to be produced using the same quantity of tinplate.

Not only that, but spray cans made from rasselstein® Solidflex are lighter than conventional aerosol cans. This results in a weight reduction of up to 14 percent compared to standard spray cans.

By using rasselstein® Solidflex, the customer doesn’t just reduce material costs, but also minimizes the CO2 footprint for each can. This ecological factor cannot be underestimated. Paired with the high recyclability of 95 percent for tinplate packaging, cans made from rasselstein® Solidflex are environmentally friendly and climate compatible.

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