A lap seal is a specific packaging technique used to create the vertical seam on a stick pack by overlapping the film edges. Unlike other methods that pinch the film together, a lap seal bonds the outer side of one film edge directly to the inner side of the opposite edge. This technique, also known as an overlapped seam, creates a flat, sleek profile on the back of the package.
The lap seal is defined by its flat, overlapping construction, joining the exterior of the film to the interior, distinct from the protruding "fin" found on standard packaging.
The Mechanics of the Lap Seal
How the Bond is Formed
The defining characteristic of a lap seal is the "Outer on Inner" connection.
Instead of folding the film so the insides touch, one edge is laid flat over the other. This creates a seam that lies flush against the back of the stick pack.
Variations in Configuration
According to industry standards, there are two specific variations of this sealing method.
You may encounter either a standard lap seal or a reverse lap seal. Both utilize the same overlapping principle but differ in how the film is fed or oriented during the sealing process.
Comparing Lap Seals to Fin Seals
The Fin Seal Alternative
To understand the lap seal, you must understand its primary alternative: the Fin Seal.
As noted in technical documentation, a fin seal (or T-seal) joins the two interior sides of the packaging material together. This results in a fin-like fold that protrudes from the back of the stick pack.
Structural Differences
The choice between these two creates a fundamental difference in the package's geometry.
The fin seal creates a "tail" or handle on the back, while the lap seal remains aerodynamic and flat.
Understanding the Trade-offs
Film Compatibility
The most critical consideration with a lap seal is the composition of your packaging film.
Because you are sealing the outer face to the inner face, both sides of the web must be chemically compatible for sealing. In contrast, a fin seal only requires the inner layer to seal to itself.
Aesthetic Profile
Lap seals are often chosen for branding and aesthetics.
Because the seal lies flat, it does not obscure text or graphics as much as a protruding fin seal might. It offers a cleaner, more continuous canvas for your artwork.
Making the Right Choice for Your Project
Choosing the correct seal type depends on your specific material constraints and aesthetic goals.
- If your primary focus is a sleek, seamless appearance: Choose a Lap Seal to ensure the seam lays flat against the back of the pack.
- If your primary focus is using standard barrier films with non-sealable outer layers: Choose a Fin Seal, as it only requires the inner sealant layers to bond together.
Select the seal that aligns with your film technology to ensure a secure, durable package.
Summary Table:
| Feature | Lap Seal | Fin Seal |
|---|---|---|
| Sealing Method | Outer surface to Inner surface | Inner surface to Inner surface |
| Visual Profile | Flat and sleek (flush) | Protruding "tail" or "fin" |
| Graphic Space | Minimizes obstruction of artwork | Can obscure graphics on the back |
| Film Requirement | Both sides must be heat-sealable | Only the inner layer must be sealable |
| Common Use | Premium aesthetics, low-bulk packs | Standard barrier films, easy-open packs |
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