What’s The Best Way To Heat Seal Foil Liners on Jars?

Content Menu

● Introduction to Heat Sealing

>> Induction Sealing

>> Heat Tunnel Sealing

● Types of Foil Liners for Jars

>> One-Piece Liners

>> Two-Piece Liners

● The Sealing Process

>> Induction Sealing Process

>> Heat Tunnel Sealing Process

● Troubleshooting Common Issues

● Conclusion

● FAQ

>> 1. What is the purpose of using foil liners on jars?

>> 2. How do induction liners work?

>> 3. What are the differences between one-piece and two-piece liners?

>> 4. Can foil liners be used with glass containers?

>> 5. Are foil liners recyclable?

● Citations:

Heat sealing foil liners on jars is a crucial process in packaging, particularly for products requiring airtight seals to maintain freshness and prevent contamination. This method is widely used in industries such as food, beverages, and pharmaceuticals. In this article, we will explore the best practices for heat sealing foil liners on jars, including the types of liners available, the sealing process, and troubleshooting common issues.

Introduction to Heat Sealing

Heat sealing involves using heat to melt a layer of material, typically a wax or polymer, which then bonds with the container, creating a hermetic seal. This process can be achieved through different methods, including induction sealing and heat tunnel sealing.

Induction Sealing

Induction sealing is a popular method for heat sealing foil liners. It uses an electromagnetic field to heat the aluminum foil in the liner, activating the seal layer and bonding it to the container. This method is efficient and provides a tamper-evident seal, which is essential for ensuring product integrity.

Heat Tunnel Sealing

Heat tunnel sealing involves passing the container through a heated tunnel, where the liner is melted and adheres to the container. This method is commonly used for products that require a simple, cost-effective sealing solution.

Types of Foil Liners for Jars

Foil liners come in various types, each designed for specific applications:

One-Piece Liners

One-piece liners consist of a foam-backed or paper-backed foil laminate. They are suitable for single-use products or dry goods. Once sealed, the entire liner is removed from the cap.

Two-Piece Liners

Two-piece liners include additional layers such as wax and pulp board. During the sealing process, the wax melts and is absorbed into the pulp board, allowing the foil to adhere to the container while the pulp board remains in the cap. This type is ideal for resealable containers.

The Sealing Process

Induction Sealing Process

1. Prepare the Container: Ensure the jar is clean and dry.

2. Apply the Cap: Place a cap with an induction liner onto the jar.

3. Use an Induction Sealer: Hold the induction sealer over the cap until the seal is formed.

Heat Tunnel Sealing Process

1. Fill and Cap the Jar: Fill the jar with the product and apply a cap with a heat seal liner.

2. Pass Through the Heat Tunnel: The liner will melt and adhere to the jar.

Troubleshooting Common Issues

- Weak Seals: Check the induction coil distance and ensure proper alignment.

- Scorched Seals: Adjust the power setting on the induction equipment.

Conclusion

Heat sealing foil liners on jars is a precise process that requires the right equipment and technique. By understanding the types of liners available and the sealing methods, manufacturers can ensure their products are properly sealed, maintaining freshness and preventing tampering. Whether using induction sealing or heat tunnel sealing, the goal is to achieve a hermetic seal that protects the product and meets regulatory standards.

FAQ

1. What is the purpose of using foil liners on jars?

Foil liners are used to create a hermetic seal, preventing moisture and air from entering the container, thus extending the product's shelf life and ensuring tamper evidence.

2. How do induction liners work?

Induction liners use an electromagnetic field to heat the aluminum foil, activating the seal layer and bonding it to the container, creating a tamper-evident seal.

3. What are the differences between one-piece and two-piece liners?

One-piece liners are suitable for single-use products and are removed entirely after sealing. Two-piece liners allow for resealing as the pulp board remains in the cap after the foil is removed.

4. Can foil liners be used with glass containers?

Yes, foil liners can be used with glass containers, but special heat seal layers like GlassFuze™ may be required for optimal performance.

5. Are foil liners recyclable?

Currently, liners are not part of standard recyclability schemes, but there are options available for producers aiming to facilitate closed-loop recycling.

Citations:

[1] https://www.mjspackaging.com/blog/cool-ways-to-use-heat-seal-liners/

[2] https://www.seliggroup.com/overcoming-induction-heat-sealing-pain-points/

[3] https://www.paramountglobal.com/knowledge/cap-liners-and-seals-guide/

[4] https://aaronpackaging.com/blogs/news/how-to-install-heat-induction-seal-his-liners-onto-your-bottle

[5] https://www.sks-bottle.com/InductionSealing.html

[6] https://parkwayjars.com/liners-101/

[7] https://www.seliggroup.com/resources/pht-guide-for-induction-sealing/

[8] https://www.containerandpackaging.com/resources/heat-induction-seals-the-mystery-explained