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ECMA F40.02.00.00.22

Triangular Carton with Rounded Back Corners

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

Top highlights

Distinctive triangular footprint with a sharp front point
Smooth, rounded back corners formed by internal webbed flaps
Hinged full-cover lid with a secure front tuck-and-slit lock

About this product

The F40.02.00.00.22 is a specialty folding carton defined by its distinctive triangular footprint. It features a hinged full-cover lid, a sharp front point secured by a tuck lock, and two rounded back corners that give the package a softer profile on the retail shelf.

Delivered flat for manual assembly, this carton relies on internal webbed corner flaps to create its curved rear profile. It is a strong choice for cosmetics, confectionery, gift items, or sliced products that naturally fit a three-cornered shape, though the sharp front point requires careful handling during transit.

Common uses

Cosmetics
Premium confectionery
Pie or cake slices
Specialty gifts

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Size and quantity

Detailed dimensions

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Width across the flat back edge

Length from the back edge to the front point

Internal height

Size notes

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Materials and print

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Custom changes or unusual needs

How will these boxes be assembled and packed?

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Premium Retail and Sliced Food Presentation

Premium Retail Presentation

The non-rectangular shape stands out immediately on crowded retail shelves. The large, uninterrupted triangular lid provides a broad panel for premium graphics, foil stamping, or embossing.

Sliced Food and Confectionery

The three-cornered base naturally accommodates pie slices, cake portions, or specialty chocolates. When used for food, the board must be specified with appropriate food-contact coatings or paired with a primary wrapper.

Limited-Edition Kitting

The hinged lid and front lock create a deliberate unboxing experience. The internal webbed corners keep the side walls tensioned, providing a clean presentation when the lid is lifted.

Point-of-Purchase Display

The distinctive footprint draws attention in point-of-purchase environments. The flat base provides stability for countertop display, while the angled side walls offer unique branding surfaces.

Cosmetics, Gifts, and Specialty Foods

Cosmetics and Fragrance

Beauty brands use this shape to differentiate limited-edition items or uniquely shaped bottles. The rounded back corners offer a softer aesthetic compared to rigid geometric boxes.

Specialty Foods and Bakeries

Bakeries and gourmet food producers use this carton to package individual slices without forcing them into oversized square boxes, reducing internal movement.

Corporate Gifting and Promotions

Promotional campaigns benefit from the unusual shape, which signals a premium or exclusive item before the package is even opened.

High-Speed Lines and Parcel Shipping

High-Speed Automated Packing

The webbed corners and triangular footprint typically require manual erection or specialized multi-point folder-gluers. If your line relies on automated case erectors, a conventional rectangular carton is a safer choice.

Loose Parcel Shipping

The sharp front point is vulnerable to crushing if shipped individually through courier networks. If the primary package must handle parcel transit without an outer shipper, consider a more durable corrugated mailer.

Fully Rounded Profiles

If the sharp front point poses a risk to your product or handling process, a variant with three rounded corners may be a better fit.

Board Grade, Assembly Labor, and Master Packing

Board Grade and Corner Radius

The rounded back corners require a board that can crease and curve without cracking the outer liner. High-quality virgin fibers, such as solid bleached board (SBB) or folding boxboard (FBB), are strongly recommended over recycled grades or micro-flutes.

Assembly Labor

Because the blank is usually supplied flat, packers must manually fold the webbed corners inward and raise the side walls before loading. Discuss whether your fulfillment team can absorb this assembly time or if your converter can pre-glue the corners.

Master Packing Efficiency

Triangular boxes leave empty voids when packed into standard rectangular corrugated shippers. This reduces pallet efficiency and may require custom inserts to prevent the cartons from shifting during transit.

Closure Security

The tuck tongue features a small locking tab that catches inside a slit. The board thickness affects how tightly this lock engages, so prototypes should be tested with the actual production material.

Triangle Angles and Corner Radius

Adjusting the Triangle Angles

The angles of the side walls can be modified to fit wider or narrower products. However, the lid and base angles must remain identical to ensure the front tuck tongue aligns perfectly with the locking slit.

Corner Radius Sizing

The radius of the back corners can be adjusted. A very tight radius increases the risk of board cracking, while a very large radius may reduce the internal clearance for your product.

Window Additions

A window can be die-cut into the lid to display the product. It should be kept well away from the back hinge and the front tuck tongue to maintain the cover's strength.

Board and packing details

Front lock security and slit length

The tuck tongue features a small locking tab that catches inside a slit at the front point of the tray. The length of this cut must be precisely matched to the board thickness to prevent tearing during repeated opening.

Additional notes

Grain direction

Grain direction should ideally run parallel to the back wall hinge to ensure the lid opens and closes smoothly, though this may conflict with nesting optimization during printing.

FAQs

Assembly and Packing

Does this carton require glue?

It depends on your converter's setup. The webbed back corners can be glued in-line on specialty equipment to create a collapsible tray, or the carton can be supplied entirely flat for manual folding and friction-locking by your packing team.

Material and Finish

Can I use corrugated board for this shape?

Micro-flutes are often unsuitable. The material is usually too thick to fold the intricate webbed corners cleanly, and the fluting may crack when rolled around the back corner radius.

Shipping and Route

Is this box safe for ecommerce shipping?

Not on its own. The sharp front point is vulnerable to impact damage in mixed-carrier parcel networks. It should be placed inside a protective corrugated outer shipper for ecommerce fulfillment.

Product Fit

How do I measure my product for this box?

You need to confirm the overall length from the back wall to the front point, the maximum width across the back, and the height. Ensure your product clears the internal webbed flaps that fold inward at the rear corners.

Design and Print

Can I add a window to the lid?

Yes, a window can be die-cut into the lid to display the product. It should be kept well away from the back hinge and the front tuck tongue to maintain the cover's strength.

Production

Why might this cost more than a standard carton?

Triangular blanks do not nest efficiently on a rectangular sheet of board, leading to higher offcut waste. Additionally, if the corners are pre-glued, it requires specialized folder-gluer setups.

Closure

How does the front lock work?

The tuck tongue has a small locking tab that inserts into a slit at the front point of the tray, holding the lid closed via friction without requiring tape or adhesive.

Modifications

Can I change the angle of the front point?

Yes, the side wall angles can be adjusted to make the triangle wider or narrower, as long as the lid and base geometry remain identical so the lock aligns properly.