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EVF11120

Snap-Lock Carton with Tongue Lock Top

Available in a wide range of custom configurations & material selection.
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Product details

Top highlights

Tongue lock top resists accidental opening
1-2-3 snap-lock base for manual assembly
Delivered flat with a pre-glued side seam

About this product

This folding carton combines a secure, positive-locking top with a sturdy 1-2-3 snap-lock base. Designed for retail shelves, the top lid features a distinct tongue that snaps into a slot on the front wall, preventing the carton from springing open or being easily disturbed.

Because the snap-lock bottom is folded manually at the packing station, this package is a strong choice for hand-kitted products where top-closure security is a priority, but the volume does not justify a pre-glued auto-bottom.

Common uses

Retail cosmetics
Light electronics
Pharmaceuticals
Manual kitting

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Retail and Presentation Packing

Retail display

The tongue lock keeps the lid firmly seated, maintaining a clean presentation on the shelf without relying on clear wafer seals or tape.

Manual kitting

The 1-2-3 bottom is straightforward to fold by hand, making it practical for fulfillment centers packing cosmetics, light electronics, or pharmaceuticals.

High-touch consumer goods

Products that encourage unboxing interaction benefit from the tactile snap of the tongue lock, which feels more deliberate than a standard friction tuck.

Light electronics packaging

The interlocking base provides a rigid floor that supports moderate weight better than a standard tuck bottom, keeping devices secure during handling.

Product and Channel Fit

High-touch retail

Brands that want a premium unboxing experience benefit from the tactile snap of the tongue lock, which feels more deliberate than a standard friction tuck.

Light consumer goods

The interlocking base provides a rigid floor that supports moderate weight better than a standard tuck bottom, keeping products secure during handling.

Fulfillment centers

Operations relying on hand-packing can use the 1-2-3 bottom without needing specialized erecting machinery, balancing labor time with a simpler flat-delivery format.

When to Consider Alternative Cartons

High-speed automated packing

If your fulfillment line uses automated erecting equipment, consider a crash-lock (auto-bottom) carton, which opens in one motion without manual flap folding.

Heavy or parcel-shipped goods

For direct courier shipping or heavy items, the snap-lock base can disengage under stress. Consider a corrugated mailer or an outer master shipper.

Board, Assembly, and Layout Choices

Board caliper and lock fit

The thickness of the paperboard directly affects how tightly the tongue lock and slit locks engage. Standard folding boxboard (FBB) or solid bleached sulfate (SBS) usually provides the best balance of stiffness and clean die-cutting for these small tabs.

Assembly labor

The 1-2-3 bottom involves an operator folding four flaps in sequence. This labor should be factored into the overall packing strategy when evaluating pre-glued bases.

Print and finish routing

The single side seam relies on adhesive, so any UV coatings or laminations should be kept clear of the glue flap to ensure a strong bond.

Order volume and layout

For larger runs, a paired (2-up) layout can nest two carton blanks together, improving sheet utilization and material yield.

Template Adjustments

Tongue and slot clearances

The width of the locking tongue and the depth of the receiving slot can be adjusted to match the chosen material, ensuring the lock is secure but not too difficult to open.

Snap-lock geometry

The interlocking base flaps can be modified with different tapers or bevels to ease manual assembly or tighten the final fit.

Slit lock depth

The small notches on the tuck flap can be deepened or offset depending on the board thickness, adding a second layer of friction against the dust flaps.

Packing details

Side seam gluing and delivery

These cartons are processed through a straight-line folder-gluer, which seals the single side seam. They are delivered knocked down (flat) to maximize pallet efficiency and storage space before use.

Layout Variants

EVF11120#2P (Paired Layout)

A 2-up nested layout that interlocks two carton blanks on the die-cutting sheet. This reduces material waste and improves material yield for repeat production runs.

Additional notes

Slit locks on the top closure

In addition to the main tongue lock, the top tuck flap features small side notches (slit locks) that catch on the internal dust flaps, adding a second layer of friction to keep the lid closed.

FAQs

Does the 1-2-3 bottom use tape or glue?

No. The four bottom flaps interlock mechanically to form a rigid base. The only adhesive used is the side seam, which is applied by the manufacturer before delivery.

How does the packing speed of a snap-lock bottom compare to a crash-lock?

A snap-lock involves an operator folding and pushing the bottom flaps into place, which takes a few seconds per carton. A crash-lock opens in one motion. The choice depends on whether the simpler production route offsets the extra seconds on the packing line.

Is the tongue lock tamper-evident?

While the tongue lock provides strong resistance against accidental opening and deters casual tampering on a retail shelf, it is not formally tamper-evident. If tamper evidence is necessary, a destructible label or seal should be added.

Can this carton be made from corrugated board?

It is generally a poor fit. The intricate cuts of the tongue lock and the tight folds of the snap-lock base are suited for paperboard. Corrugated material is usually too thick and can cause the locks to bind or crush.

Can this carton be shipped directly in the mail?

No. The snap-lock base and tuck top are designed for retail presentation and primary packaging. For parcel networks, this carton should be placed inside a corrugated outer shipper.

What is the benefit of the paired layout?

The paired layout nests two carton blanks together during die-cutting. This maximizes the use of the paperboard sheet and reduces waste, which can improve material yield for larger orders.

Can the tongue lock be opened and closed multiple times?

Yes, the tongue lock is designed for repeated use. However, because it relies on a small paperboard tab, excessive force or very frequent opening may eventually wear or tear the tongue.

Does the side seam interfere with artwork?

The side seam is glued on the inside of the carton, so it does not disrupt the exterior graphics. However, the glue flap area itself should remain free of coatings or varnishes to ensure proper adhesion.