One aspect of packaging that often gets overlooked is sealing. You can have the perfect design and label for your product but if your package isn’t sealed correctly, it will all be for nothing.
One way to seal your plastic bottles is through a process known as induction sealing. In this blog, we’ll talk about what you need to know about induction seals, the various benefits and how they work.
What are induction seals?
Induction seals play an important role when it comes to a product’s packaging. Induction sealing creates a hermetic seal through a closure that is lined with a heat-seal foil cover. The hermetic seal ensures the package is airtight and preserves the materials by keeping any contaminants from entering.
Induction seals can be used in any industry that has a jar or bottle involved. They are used to ensure that a bottle does not leak or be tampered with.
Recently, there has been a heavy emphasis on using induction seals for products that are being sold and shipped across large expanses of land. This is because an induction seal does not only rely upon the cap to keep the contents of a bottle from spilling. Many distribution companies are now encouraging retailers to use induction seals on their products to help safeguard them during shipping. However, ensuring safer shipping is just one example of the benefits induction seals provide.
The benefits of using induction seals
The use of induction seals offers numerous benefits to companies for their products’ packaging. First and foremost, induction seals provide tamper evidence. The only way to access the contents of a bottle that has been induction sealed is to break the seal itself, which often leaves residue on the lip of the bottle. Because there is a heat seal that offers a layer of protection, the process provides a secure seal that allows tampering to easily be identified.
Secondly, they preserve the contents inside the packaging by preventing oxygen and moisture from entering the package. This extends a product’s shelf life and quality from production to consumption or use.
As mentioned previously, another benefit of using induction seals is the prevention of leaks with packages that contain a liquid content. The seal provides extra strength and security to the package’s opening to prevent leaking whether it is being shipped or transported from the store to a consumer’s home.
How induction seals work
The anatomy of an induction seal is really quite simple – it’s the process of using an electromagnetic field when applying the seal to the package is where it gets complicated.
Induction seals, in their most basic form, are made of three main layers:
- Heat seal
The layer closest to the opening is the heat seal that is attached to the package. Next, there is a layer of foil placed over the seal, which is followed by a backing that provides structure to the liner.
Since induction sealing is a non-contact process, it is important to understand how the process works without an individual actually touching the package. For this process to be successful, there are three key principles that need to take place: pressure, heat, and time.
To ensure the integrity of the induction sealing process, there has to be adequate cap application torque. This torque allows caps to be put on with enough pressure to complete the seal of the liner to the container. Without the correct amount of pressure, the cap will not seal correctly and this will result in leaks and other issues.
Using an induction sealing machine generates heat through an electromagnetic field, which interacts with and heats up the foil layer within the liner. This in turn melts the connected heat seal layer to bind the liner to the container. The heating stage in the induction seal process is what allows this to be done with no contact.
The last remaining factor for the induction sealing process is time. For this process, time is dictated by the speed at which the conveyor is moving. The amount of time that a package spends in the induction sealing machine is dependent on the speed at which the conveyor can send packages.
How B&I Polycontainers helps
B&I Polycontainers has working relationships with the most reliable and effective induction heat-sealing solutions. As South African plastic bottle experts, we can help guide you on which solution would be ideal for you and your product.
If you have plastic packaging needs, or would just like more information on the process, contact us today.