What Is Cold Seal Film? Cold Seal vs. Heat Seal Packaging

As your bar or snack brand grows and starts looking at larger production runs, you may eventually hear your co-packer or packaging equipment provider mention cold seal film.

So what exactly is it?

From the outside, cold-seal packaging may not look dramatically different from other flexible wrappers. The big difference is how the package is sealed and how it performs on the packaging line.

Cold seal is commonly associated with high-speed packaging applications, particularly for products such as bars, chocolate, candy and other snacks where production speed or sensitivity to heat can matter.

And there's an important distinction before we go any further:

The Pouch House does not currently manufacture cold-seal film as part of our standard product offering.

So why are we talking about it?

Because our customers ask about it. And if you're growing a bar brand, understanding the difference between cold seal and heat seal can help you have a much better conversation with your co-packer before you choose your packaging.

What Is Cold Seal Film?

Cold-seal packaging uses a specially applied adhesive system that allows areas of the packaging web to bond together through pressure rather than requiring the sealing jaws to apply the heat normally used with heat-seal packaging.

That makes cold seal particularly useful on certain high-speed packaging lines and for products where minimizing exposure to heat is important.

For a growing brand, however, the bigger consideration is often equipment compatibility.

Your co-packer may have equipment specifically configured for cold-seal material. If that's the case, it's important to know that before choosing your packaging structure.

Cold Seal vs. Heat Seal Film

Both can be used to create flexible packaging for bars and snacks, but they work differently.

Sealing Process

Cold Seal Film:
Uses a cold-seal coating that bonds under pressure, allowing the package to be sealed without applying heat at the sealing point.

Heat Seal Film:
Uses a heat-sealable layer that bonds when the packaging equipment applies the appropriate combination of heat, pressure and dwell time.

Heat-Sensitive Products

Cold Seal Film:
Can be useful for products that are sensitive to heat, including certain chocolate-coated bars, candies and snacks.

Heat Seal Film:
Works across a wide range of snack and bar applications, but the appropriate sealing conditions need to be considered when the product itself is particularly heat sensitive.

Production Speed

Cold Seal Film:
One of its biggest advantages is its suitability for very fast packaging lines. Eliminating the need to heat and cool the seal can support higher production speeds on equipment designed for cold seal.

Heat Seal Film:
Production speed depends on the film structure, equipment and required sealing conditions. For many growing brands and production environments, heat seal remains a very practical option.

Equipment Compatibility

This may be the most important point for a growing brand.

Cold Seal Film:
Requires packaging equipment configured to run the appropriate cold-seal material.

Heat Seal Film:
Requires equipment capable of applying and controlling the heat needed to create the seal.

Neither is automatically the "better" choice. The right choice has to work with your product, packaging material and the equipment that will actually fill and seal it.

Your Co-Packer May Make the Decision for You

This is where we see brands get tripped up.

You may find a co-packer that looks like a perfect fit — only to learn that its bar-wrapping equipment is configured specifically for cold seal.

That's a conversation worth having before you order packaging.

Ask your co-packer:

• What type of packaging film does your equipment require?
• Does the line run cold seal, heat seal or both?
• Are there specific film structures or specifications you require?
• What roll dimensions and core specifications does the equipment need?
• What production volumes make sense for the line?

Getting those answers early can save a lot of headaches later.

When Does Cold Seal Make Sense?

Cold seal tends to become more relevant as production volumes increase and brands move toward highly automated packaging.

For a brand producing millions of units, small improvements in line speed and efficiency can become extremely important.

But that's a very different production environment from a company launching its first bar or testing a handful of new flavors.

And that's why hearing “cold seal” doesn't necessarily mean you've reached the wrong packaging solution. It may simply mean you need to understand what your co-packer's equipment requires.

What If You're Not Ready For That Kind Of Volume?

You have options.

Many emerging brands start with shorter production runs, manually fill pre-made wrappers or pouches, and move into automated roll-stock packaging as volume grows.

That allows you to test flavors, build distribution and learn what customers actually buy before committing to the production volumes associated with larger automated programs.

That's the part of the journey where The Pouch House can help.

We offer custom printed bar wrappers with low minimums for growing brands, along with roll-stock solutions as production needs evolve.

[Explore Custom Printed Bar Wrappers →]