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What Induction Sealing Can Tell Us About Innovation in Manufacturing

Plastic and foil seals are a vital part of keeping essential goods fresh, from milk to medicines. For the last 35 years, manufacturers have fixed these lids on with induction sealing: the process of bonding thermoplastic/foil laminate materials through induction heating. Historically, this process has been limited to induction cap sealing: relying on a screwcap to keep the lid in place while using electromagnetic induction to heat an electrically conductive foil from a distance, through the plastic. This in turn melts the polymer resin in the lid onto the neck of the container to form a hermetic seal. It’s incredibly effective for containers with screw caps, as the cap holds the lid in place with the right amount of pressure for it to bond to the container neck.

This approach to induction sealing was “good enough” for many years. The fact that it worked perfectly well at it’s designated task meant that improvement was not particularly sought after or requested. But as with any technology that stagnates, this lack of innovation began to show its weaknesses and holding the industry back.  

Many containers that require hermetic seals do not or cannot accommodate screwcaps – square containers are one example. And rigid materials, such as glass, do not offer an even contact surface, making them difficult to hermetically seal with a cap alone. Most importantly here, many applications in life sciences require a simple, hermetically sealed lid that can be easily punctured, or torn off by someone wearing gloves – so any kind of screwcap is unsatisfactory.

Over time, these limitations became more pressing – particularly as consumers began demanding more easily transportable products in lighter packaging and different shapes. At Relco we realised there needed to be a more efficient and versatile option that didn’t require screw caps, without sacrificing the productivity of this tried-and-tested technology.

The catalysts for innovation

The need to go beyond what traditional induction sealing methods could offer might sound like a problem. But these kinds of drivers are essential to move innovation forward – in any industry. The demand for greater productivity, sustainability and efficiency often lead to new ideas and different ways of approaching new problems – which, in turn, can have new, unforeseen applications further down the line. Nowhere is this more vital than in manufacturing, where customer demands are devoloping at unprecedented pace, there is a growing need for flexibility and sophistication in assembly lines and supply chains.

Let’s look back at the induction cap sealing issue. Seeing the growing need in many industries for hermetically sealing without a screw cap, we decided to try something new. So we began working on a solution that autonomously positions lids with the correct amount of pressure, without the need for a screw cap, and developed our direct contact induction sealing solution.

Our partners can use this technology to seal all kinds of containers, without the need for screwcaps or a completely even contact surface. This isn’t a trivial advantage. It allows businesses and manufacturers to rapidly protect perishable or spillable products, with a soft peelable lid that can be quickly and easily removed by hand, without the need for any great dexterity. The direct heating solution can melt a foil seal in 200 miliseconds, enabling faster sealing times for much quicker throughput. The solution is also more sustainable; the heating element for direct induction sealing remains at ambient temperature, saving power, while reducing wear and tear, and the risk of accidents.

This is particularly vital when producing diagnostic tests, where moisture- or oxygen-sensitive chemicals and re-agents need to be transported in small, measured doses that are easy to open. Over the years, since developing our direct-induction sealing solutions, many of our clients in life sciences have begun to rely heavily on our ability to seal and protect these vulnerable materials.

Enter COVID-19: meeting unpredicted needs

Any crisis will amplify the strengths and weaknesses of any industry and company. The COVID-19 pandemic has sent a shockwave through manufacturing as medical and healthcare workers were under increasing pressure to scale up the creation of new diagnosis tests for the virus. The need for large volumes at speed increased the pressure for our partners to rapidly measure, seal and transport incredibly large numbers of reagent doses.

Fortunately, we’d been working with one client to create a flexible, integrated assembly line for re-agents, using Rockwell MagneMotion solution to create highly customised individualised treatments. This enables complete traceability over each individual package, and allows us to easily add and remove different stages to the assembly line, such as gas flushing, for a truly customised output. This kind of flexibility has been vital to help the client pivot to providing COVID-19 tests.

We were also keen to do our bit to help other clients meet their targets more quickly in this time of crisis. So, to enable our partners to reach the required sealing and production speeds, we decided to take a more active role in their supply chains. Previously, we would ship out the sealing heads and other component parts for our partners to assemble. But this complicated process could take weeks before they were ready. So we simplified the process, pre-wiring the components into a Rockwell point I/O monitoring system. All the client has to do is provide electricity, and ethernet, saving around 7-10 days engineering time onsite, so these vital tests can be ready sooner.

The importance of flexibility

Continuous innovation, particularly that which builds flexibility into your products, processes and supply chains, is vital for manufacturers to adapt to sudden changes and stay ahead. It’s becoming clearer than ever that manufacturers with the right technology and solutions can rapidly adapt to solve unanticipated problems. And by working with the right partner, they can ensure that they are making the right decisions and future-proofing their company for years to come. 

Even when a technology appears to do its job perfectly, it’s crucial to keep innovating. You never know what hidden potential you could be missing, or what future problems you might be helping to solve.

Join us at Interpack 2021 and see Relco machines in action, first hand.


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