Induction sealing machine is the process of bonding thermoplastic materials by induction heating. This involves controlled heating an electrically conducting object (usually aluminum foil) by electromagnetic induction, through heat generated in the object by eddy currents.
Induction sealing is used in many types of manufacturing. In packaging it is used for package fabrication such as forming tubes from flexible materials, attaching plastic closures to package forms, etc. Probably the most common use of induction sealing is cap sealing, a non-contact method of heating an inner seal to hermetically seal the top of plastic and glass containers. This sealing process takes place after the container has been filled and capped.
Induction aluminum foil sealing machine is used for PP, PE, PET, PS, ABS, HDPE,LDPE and glass bottles, which utilizes electromagnetic principle to produce instant high heat to melt aluminum foil that then adheres to the opening of the bottles, reaching the aim of wet-proof, leakage-proof, mildew-proof and extending preservation time.
1. Digital display for working voltage and current, clear and intuitive
2. Over-voltage, over-current automatic protection, safe and reliable
3. Air cooling self-circulation systems, high sealing power, high quality, stable performance
4. Can used in production line or work independently
5. Full 304 stainless steel with surface finishing and special treatment which ensure good quality and artistic appearance
1) Sealing for PET bottles, PP bottles, PVC bottles, PE bottles, HDPE bottles, plastic bottles, glass bottles, etc
2) Widely used in cosmetic, drinks, chemical, medical, food industry etc, which can highly improve productivity and product quality.
|Voltage||AC 220V 50HZ 110V 60HZ|
|Capacity||2.4-18m/min (180 bottles/min for 30mm diameter PET bottle|
|Bottle height||30-260mm (special size for designing )|
|Machine size||Main Engine: 600mm*450mm*1200mm|
Conveyor Table: 1800mm*180mm*1300mm
|Machine Weight||Main Engine:90Kg|
What is Induction Sealing?
Induction sealing is a non-contact method of bonding materials made from thermoplastics through electromagnetic induction which generates eddy currents to heat the materials. In the packaging industry, this process is used to hermetically seal a container cap having a foil laminate sealable by heat. In the case of our Aluminum Foil Induction Sealer Equipment, the foil laminate is an aluminum heat induction liner.
What is an Aluminum Heat Induction Liner?
You’ve seen these things covering bottle and jar containers when you open a packaged product such as peanut butter or bottled medicines. An aluminum heat induction liner is a silver foil at the opening of a container that proves that the packaged product is tamper-evident. They require an aluminum foil induction can sealing equipment to properly seal these liners to the can.
Moreover, a typical aluminum heat induction liner inside a cap is a multi-layered seal made up of the following strategically situated and designed layers:
- A pulp paperboard layer
- A wax layer
- An aluminum foil layer
- A polymer layer
The topmost layer, which is the pulp paperboard layer, nests against the lid’s inside part and is spot-glued to it. Followed by a layer of wax used to bind the pulp paperboard layer to the third layer, the aluminum foil, which is the layer that adheres to the container. The last layer at the bottom is the polymer layer which looks like a plastic film.
These four layers work together in order to achieve the necessary dynamics for a successful induction process to produce an airtight seal.
Best Material in Foil Sealing Process
1. Paper Board
Paper boards are three-dimensional polymer coatings with higher weight per unit area that you can use to seal jars and bottles.
Advantages of Using Paper Board
The material is leak-proof thus protecting the container from leaking and retains the microbiological quality of the content.
Apart from that, it is readily available in different grades for you to choose from depending on your sealing choices.
Paper board also blocks light (not entirely), and other impurities that may affect the integrity of the content.
Disadvantages of Using Paper Board
The sealing process is quite challenging as it leads to the formation of wrinkles and creases.
The wrinkles and creases act as capillary channels that may cause leaks and affect the integrity of the package.
2. Aluminum Foil
Aluminum foil has physical and thermal properties that make it a suitable material for foil sealing.
It is a common sealing material for plastic containers such as yogurt cans.
Advantages of Using Aluminum Foil
The main advantages that make aluminum foil more suitable for sealing include:
- High machinability thus increasing its compatibility with different sealing machines.
- Relatively high strength and hardens over time hence less susceptible to damages.
- Cost effective and easy to acquire
- Corrosion resistant with high thermal conductivity
- Has wonderful printing effects
- It is waterproof and nontoxic thus increasing the safety of consumable materials such as food.
Disadvantages of Using Aluminum Foil
The major disadvantages of using aluminum foil include:
- Pure aluminum foils are easy to wrinkle and may affect the integrity of the seal.
- It is more expensive in comparison to other sealing products.
3. Heat Sealing Layer
The heat sealing layers are types of sealing polymers that you can trigger by pressing the sealing bars closer.
It often consists of a silicone seal that is capable of withstanding extreme temperatures.
The sealing bar presses on the film and wire until it melts thereby forming a seal over the containers.
Advantages of the Heat Sealing Layer
The main advantages of the heat sealing layer include:
- It is strong, thick, and tamper proof thus keeping the external environmental effects at bay. Round wire heat sealing layers make thin and less visible seals.
- Forming a heat sealing layer is a quick and straightforward process.
- You can easily incorporate it on different products such as foil, plastic materials, and poly coated Kraft paper bags.
- The heat sealing layers are available in different designs and sizes.
Disadvantages of Heat Sealing Layers
The major demerits of the heat sealing layer include:
- It requires a special type of machine which is expensive to acquire.
- Making a printing effect on the heat sealing layer is difficult.
You should note that the seal can either incorporate one or all of the above sealing materials on to the container.
How Aluminum Foil Induction Sealing Machines Work
The induction sealing process starts by supplying an already product-filled cap-container combination to the aluminum foil induction bottle seaming machine. The lid has already an aluminum foil heat induction liner inserted in it before it is capped to the container.
The cap-container combination passes under the seamer head, which is emitting an oscillating electromagnetic field, via a moving conveyor. As the bottle passes under the seamer head, the aluminum foil heat induction liner starts to heat because of the eddy currents. The wax layer, which is the second layer of the induction liner, melts and is absorbed by the topmost layer - the pulp paperboard layer.
When the wax layer melts completely, the third layer (the aluminum foil layer) is released from the lid. The last liner layer, the polymer layer, also heats and melts onto the plastic container’s lip. Once the polymer cools down, the created bond between the polymer and the container produces a hermetically sealed product.
The whole sealing process does not negatively affect the product inside the container. Though it is possible for foil overheating to happen which causes damages to the layer of seal resulting in faulty seals. To avoid this, VKPAK performs strick quality inspection through the whole manufacturing process of your customized aluminum foil induction can seamer equipment.