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EVF13045

Auto-Erecting Triangular Cake Box

Available in a wide range of custom configurations & material selection.
Order 1 sample. Or order 100K+ units. Or anything in between.
Affordable delivery across North America.
Design support, warehousing, testing, assembly available.
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Product details

Top highlights

Opens from a flat-folded state
Back-loading tuck closure with corner dust flaps
Dual side windows for retail display

About this product

The EVF13045 is a pre-glued, flat-shipping triangular carton designed for fast service at retail bakery counters. By squeezing the folded edges, the top and bottom panels snap into place, creating a rigid triangular prism that loads from the back.

This auto-erecting design eliminates manual folding at the point of sale, making it practical for single slices of cake, pie, or sandwiches. Two large side windows provide clear product visibility, while a tuck-in back lid secures the slice.

Common uses

Retail bakery counters
Cafe grab-and-go displays
Sandwich packaging
Event catering

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Size and quantity

Detailed dimensions

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Length (tip to back)

Width (across the back crust)

Height (tallest point)

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Materials and print

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Print and artwork

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Do you need clear display windows on the sides?

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Retail Bakery and Cafe Applications

Retail bakery counters

The auto-erecting mechanism allows staff to open and load the box in seconds. The slice slides in crust-first through the back opening, keeping the delicate tip protected against the front fold.

Cafe grab-and-go displays

The dual side windows offer clear visibility in refrigerated or ambient display cases. The flat-bottom orientation keeps the slice stable, while the triangular shape naturally resists side-to-side crushing.

Event catering and boxed lunches

For large events, the flat-shipping delivery saves space during transport, and the fast assembly helps catering staff portion and pack triangular items quickly.

Food truck and pop-up service

When operating in tight spaces, pre-glued auto-erecting cartons take up minimal room until the moment of service, keeping the workflow organized and fast.

Service Speed and Display Needs

High-volume counter service

When counter space is limited and service speed matters, pre-glued auto-erecting cartons outperform flat, unassembled trays. The boxes store flat under the counter and take shape only when needed.

Local food delivery

While the tuck closure secures the slice for hand-carry, delivery orders often benefit from a tamper-evident sticker over the back lid. The carton should be placed inside a larger delivery bag or rigid outer box to prevent crushing during transit.

Refrigerated retail display

For items stored in coolers, the board and window film should be selected to handle moisture. The large windows allow customers to inspect the product without opening the package.

When to Consider Manual-Fold Trays

Heavy vertical stacking

The large display windows and the collapsing scores on the top and bottom panels reduce the vertical strength of the side walls. If the boxes will be stacked high in a warehouse or delivery cooler, a solid-board triangular box or a rigid tray may perform better.

Short-run or manual-gluing programs

The auto-erecting action relies on precise machine gluing during manufacturing. For very short runs where automated folder-gluer setup is impractical, a manually folded snap-lock tray avoids the gluing step entirely.

Window Film, Coatings, and Board Choice

Window film and food contact

The template features open apertures on the side walls. For bakery applications, these cutouts usually involve a clear film patch to retain moisture and protect the food. This adds a window-patching step during production.

Grease-resistant coatings

Cake butter and oils can quickly stain standard paperboard. Specifying a grease-resistant internal coating keeps the presentation clean, though the converter should leave the internal glue flaps uncoated to ensure the box stays together.

Board caliper and fold behavior

Folding boxboard (FBB) offers a good balance of rigidity and clean folding. Thicker boards can cause the collapsing scores that enable the auto-erecting action to bind or tear during assembly.

Print surface and branding

The exterior panels offer ample space for branding. If the inside of the box will also be printed, the ink and coating choices should be evaluated for direct food contact safety.

Adjusting Dimensions and Window Profiles

Window resizing and removal

The side windows can be reshaped, reduced, or removed entirely. Removing the windows increases the rigidity of the carton and eliminates the need for film patching, which can lower production costs for fully printed or frozen applications.

Clearance for overfilling

The internal dimensions should allow slight clearance around the slice. If the cake is too tall, it will push against the collapsing scores, causing the top and bottom panels to bow outward and potentially pushing the back lid open.

Tuck flap friction locks

The slit locks on the back tuck flap can be adjusted in depth and angle. This helps tune the friction fit based on the chosen board caliper, ensuring the lid stays closed during handling.

Packing details

Flat delivery and storage

Because the triangular ends are glued to the side walls during manufacturing, the entire carton ships knocked-down (KD) flat. This provides excellent transport efficiency and minimizes the storage footprint at the retail location.

Windowless and Solid-Board Options

Windowless configuration

The side apertures can be removed for frozen goods or applications relying entirely on exterior printed graphics.

Additional notes

Folder-gluer setup and run size

The automated gluing process that makes this box open involves specific machine plows and hooks. Because of this setup time, the design is often more practical for repeat programs rather than very short trials.

FAQs

How does the box open from its flat state?

The top and bottom panels feature bisecting scores. During manufacturing, the box is glued flat along these lines. When you squeeze the folded edges, the scores straighten out, forcing the box into a rigid 3D shape.

Does the box come with clear windows?

The template includes the cutouts. To cover them, a clear film patch is usually specified and applied during manufacturing. This is often recommended for fresh food.

Can this box hold greasy or buttery items?

Yes, provided the paperboard is treated with a grease-resistant coating. The manufacturer will need to leave the internal glue areas uncoated so the box maintains its auto-erecting tension.

Can I ship this box through a parcel network?

This package is designed for retail hand-carry or local delivery. Parcel shipping usually involves an outer corrugated shipper to protect the carton and the product inside.

What happens if the cake slice is slightly too large?

If the slice is too tall, it will press against the top and bottom panels, causing them to bow outward along their folding scores. If it is too long, it will cause the back tuck lid to bulge.

What production methods fit this box?

It is practical at scale, but the 180-degree collapsing fold often involves specific folder-gluer setups. It is generally better suited for medium to high-volume runs where the setup time is absorbed.

How are these boxes delivered to the store?

They are delivered knocked-down flat. The gluing is done at the factory, so they take up very little space in the back room and are only opened when a customer orders a slice.

Can we print on the inside of the box?

Yes, the inside can be printed, but any inks and coatings used on the interior should be evaluated for direct food contact safety, especially for bakery items.