- All
- Product Name
- Product Keyword
- Product Model
- Product Summary
- Product Description
- Multi Field Search
Views: 222 Author: Lake Publish Time: 2025-03-24 Origin: Site
Content Menu
● Introduction to Seal Induction Liners
>> Components of a Seal Induction Liner
● The Induction Sealing Process
● Steps to Properly Apply a Seal Induction Liner
● Considerations for Different Container Types
>> Plastic Containers (PE, PET, PVC)
● Important Factors for a Successful Seal
>> Pressure
>> Heat
>> Time
● Potential Problems and Solutions
>> Overheating
● Types of Induction Seal Liners
● Importance of Material Compatibility
>> 1. What is an induction seal liner?
>> 2. How does induction sealing work?
>> 3. What materials can induction seal liners bond to?
>> 4. Why is torque important in induction sealing?
>> 5. What are the key benefits of using induction seal liners?
Applying a seal induction liner correctly is critical for ensuring product safety, extending shelf life, and preventing leaks in both plastic and glass containers. This process, also known as induction sealing, involves using electromagnetic induction to bond a multi-layered liner to the lip of a container, creating a hermetic seal. In this article, we will explore the steps and considerations for properly applying a seal induction liner to plastic and glass containers.
A seal induction liner is a multi-layered component inserted into a bottle cap. When exposed to electromagnetic induction, it bonds to the container's lip, creating an airtight barrier[6]. These liners typically consist of several layers, including a heat seal, a foil middle, and a backing piece[4]. The heat seal adheres to the lip of the container, the foil helps heat the seal, and the backing provides even pressure as well as heat insulation during the induction process[4].
A typical induction seal liner includes the following layers[1][4]:
- Pulpboard (Backing Layer): Glued to the cap, provides structure[3].
- Wax Layer: Bonds the foil to the pulpboard, melts during sealing[3].
- Aluminum Foil Layer: Conducts heat from the induction process[3].
- Polymer Layer (Heat Seal): Bonds to the container lip (made of PE, PET, etc.)[3].
The induction sealing process involves several key steps to ensure a proper seal[2]:
1. Cap Application: The cap with the induction liner is applied to the filled container.
2. Torque Control: The cap is torqued to a specific setting to ensure adequate pressure[2].
3. Induction Heating: The container passes under an induction coil, which emits an electromagnetic field[3].
4. Seal Formation: The aluminum foil heats up, melting the wax and polymer layers. The polymer bonds to the container lip[3].
5. Cooling: The polymer cools and creates a hermetic seal[3].
1. Select the Correct Liner: Choose a liner compatible with your container material (PE, PET, PVC, or glass)[4].
2. Cap the Container: Apply the cap to the filled container.
3. Torque Application: Every cap should be torqued to a certain setting depending on its container[2]. Cap manufacturers will have their own torque recommendations, but you can check out our application torque value chart for a general idea of what you'll need[2].
4. Induction Sealing: Run the container through an induction tunnel or handheld sealing unit[2].
5. Cooling: Allow the container to cool down to set the seal[2].
Plastic containers with plastic caps create the easiest and most consistent seal[7]. Select heat induction liners that are compatible with polyethylene (PE), low-density polyethylene (LDPE), high-density polyethylene (HDPE), polyethylene terephthalate (PET), or polyvinyl chloride (PVC) containers[4]. Make sure a Polyester (PET) heat seal liner is matched with a PET bottle resin and a PE based heat seal layer is best matched with a HDPE bottle[5].
It is possible to seal induction liner to glass containers with plastic caps, but some of the containers may need to be treated in order to achieve a proper seal[7].
Adequate cap application torque ensures enough pressure to complete the seal of the liner to the container[8].
Heat helps soften and melt the heat seal surface of the liner[5].
The time the foil is exposed to the induction heating process is controlled by the speed of the conveyor[5].
Overheating the foil can damage the seal layer and any protective barriers, resulting in faulty seals[3]. Proper sizing of the induction sealing is vital to determine the exact system necessary to run a particular product[3].
A consistent application of torque can help ensure that you have a proper seal on every container, which is important whether you sell hazardous material or food products that may spoil[2]. If someone caps your products manually, there's a good chance he or she will apply different pounds of torque every time without that knowledge[2].
A one-piece induction liner combines all three layers into one liner which performs as a complete seal that adheres to the lip of the container when applied with an induction machine[4]. One-piece induction liners are used for products in almost every industry[4]. This type of liner is commonly used with dispensing closures due to the closure's orifice needing to be clear for product dispensing once the seal is broken[4]. Products using one-piece induction liners include condiments, sauces, shampoo, lotions, supplements, and a variety of other consumer products[4].
Two-piece induction liners are made with a backing, wax layer, foil, and heat seal[4]. Two-piece induction liners are used in a variety of industries, including nutraceuticals, pharmaceuticals, and chemicals[4]. Product examples using two-piece induction liners include supplements, automotive products, and more[4].
Heat seal layers are dependent on the container material it needs to bond to[5]. A Polyester (PET) heat seal liner should be matched with a PET bottle resin and a PE based heat seal layer is best matched with a HDPE bottle[5].
Properly applying a seal induction liner to plastic and glass containers involves several key steps and considerations. Understanding the components of the liner, the induction sealing process, and the specific requirements for different container types is essential for achieving a secure, hermetic seal. By following the guidelines outlined in this article, manufacturers can ensure product integrity, extend shelf life, and maintain consumer confidence.
An induction seal liner is a multi-layered material inserted into a cap that, when heated, bonds to the container's lip to create a hermetic seal[1].
The process involves applying electromagnetic energy to heat the aluminum foil layer of the liner, melting the polymer layer and bonding it to the container[3].
Induction seal liners can bond to a variety of materials, including PE, PET, PVC, and glass, but they require specific heat seal layers compatible with each material[4][7].
Adequate cap application torque ensures enough pressure to complete the seal of the liner to the container, preventing leaks and maintaining product integrity[8].
The benefits include leak prevention, preservation of perishable products, and tamper evidence, ensuring product safety and extending shelf life[2].
[1] https://www.levapack.com/what-is-induction-sealing/
[2] https://www.pipelinepackaging.com/induction-liners-what-they-are-how-they-work-and-why-you-need-them
[3] https://en.wikipedia.org/wiki/Induction_sealing
[4] https://www.paramountglobal.com/knowledge/cap-liners-and-seals-guide/
[5] https://www.kaufmancontainer.com/our-solutions/induction-liners-101/
[6] https://www.enerconind.com/sealing/library-resource/induction-cap-sealing-basics/
[7] https://www.sks-bottle.com/info/understanding_induction_liners.html
[8] https://www.mjspackaging.com/blog/induction-seals-101/
[9] https://www.containerandpackaging.com/resources/heat-induction-seals-the-mystery-explained
[10] https://www.liquidbottles.com/blog/15/Down-to-the-Liners
[11] https://www.sks-bottle.com/InductionSealing.html