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ECMA C10.10.20.20

Triangular Prism Carton

  • 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.
  • Widest machinery capability in America via 30+ specialist partner plants.
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Product details

Top highlights

  • Three-sided retail presentation profile
  • Ships flat and opens for manual loading
  • Friction-fit twin tuck closures at both ends

About this product

The Triangular Prism Carton is a three-sided folding carton designed for high-visibility retail presentation. It is an excellent fit for specialty foods, confectionery, cosmetics, and promotional items that benefit from a unique shelf profile.

Delivered flat, the carton opens into a rigid triangular tube. The ends are secured by triangular flaps featuring twin tuck tabs that friction-fit inside the side walls, allowing for quick manual loading without tape or adhesive.

Common uses

  • Confectionery
  • Cosmetics
  • Triangular sandwiches
  • Cake slices
  • Promotional items

Get a quote

Share what you know. We'll take it from there. Or email us at info@herculeindustrial.com

Best Price Guarantee

Already have a packaging quote? Let us beat it.

Send us the quote you have. We will beat it for the same specifications, quantity, and delivery requirements.

Upload a competing quote

Free quote review. No obligation.

30+specialist partner plants

We supply through the plant best suited to your price, material, production, and delivery requirements.

Why we can beat a lower quote

30+ plants give us more ways to lower the price.

Each plant has different machinery, material costs, order minimums, and freight rates. Our buying volume helps us secure better pricing. We then quote through the plant that gives you the lowest total price for your requirements.

Send us your current quote. Watch us beat it.

Attach it to the quote form or email it to us. We'll review it free and send you our price.

Upload a competing quoteinfo@herculeindustrial.com
Best Price Guarantee terms

To qualify, send a written supplier quote dated within the past 30 days and addressed to your company. It must cover the same dimensions, construction, material, print, finish, quantity, tooling, freight, delivery date, and delivery location. The guarantee does not cover taxes, expired quotes, liquidation or clearance sales, or obvious pricing errors.

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Retail And Specialty Product Fit

Specialty Food And Confectionery

Naturally suited for triangular items like single-piece premium chocolates or specialty treats. The shape matches the product, reducing the need for internal inserts.

Cosmetics And Promotional Items

Provides a distinct, eye-catching footprint on retail shelves compared to square boxes. The three flat panels offer unique continuous graphic opportunities.

Triangular Sandwiches And Baked Goods

An excellent fit for cake slices, pie slices, or triangular sandwiches. The carton holds the food securely while presenting a wide front face for branding.

Long, Narrow Retail Products

Useful for items like rolled posters, umbrellas, or specialty toys. The triangular tube provides rigidity along its length while standing out from standard rectangular packaging.

Common Packing Situations

Manual Kitting And Fulfillment

Because the carton ships flat and opens with a quick squeeze, it is efficient for hand-packing lines. The twin tuck tabs are intuitive for operators to close.

Retail Display

The triangular shape stands out, but it does not stack horizontally as efficiently as rectangular boxes. It is often used standing upright or placed in custom retail display trays.

Premium Unboxing Experiences

The three-sided opening motion and unique tuck flaps offer a different unboxing experience than standard cartons, making it popular for gift sets and limited-edition items.

When To Consider A Rectangular Carton

Heavy Or Dense Products

The bottom closure relies entirely on the friction of the twin tuck tabs. Heavy items can push the bottom open. For heavier goods, a rectangular carton with a crash-lock or sealed bottom is a safer choice.

High-Speed Automated Loading

Most automated cartoning equipment is built for rectangular profiles. If you require high-speed automated loading, a reverse-tuck or straight-tuck carton will avoid the need for specialized triangular fixtures.

Direct Parcel Shipping

The non-rectangular shape and friction-fit closures are vulnerable to crushing and opening during rough handling. This carton should be placed inside a sturdy rectangular master shipper for parcel transit.

Board, Fit, And Production Choices

Board Thickness And Closure Friction

The twin tuck tabs must slide smoothly into the tube while maintaining enough friction to stay closed. The board thickness directly affects this fit. A physical sample helps verify the closure feel before a full production run.

Grain Direction And Panel Bowing

To prevent the long side panels from bowing and to ensure the longitudinal creases fold cleanly, the board's grain direction should run parallel to the height of the carton.

Flat-Fold Production Setup

While the carton ships flat, achieving that flat state requires a specific collapsing crease on one side panel. This asymmetric fold requires proper folder-gluer setup by the manufacturer.

Surface Graphics And Crease Placement

One of the side panels features a longitudinal collapsing crease that allows the three-sided tube to fold flat. When designing graphics, avoid placing critical text or fine details directly over this crease.

Template Adjustments

Base Dimensions And Flap Angles

Changing the width of the base or side panels alters the internal angles of the triangle. The twin tuck tabs must be carefully recalculated to match these new angles so the friction fit continues to work.

Tube Length Adjustments

The height of the carton can be scaled easily to accommodate longer items, provided the board maintains enough column strength to resist bowing.

Tuck Tab Clearances

The depth of the slit locks and the height of the twin tuck tabs can be adjusted to increase or decrease the friction hold, depending on the chosen board material.

Board and packing details

Storage and handling of flat cartons

Because the carton relies on a collapsing crease to lay flat, the knocked-down tubes should be stored flat and protected from high humidity to prevent the board from warping before assembly.

Variants

C10.10.20.20.a

A variant with specific default parameter adjustments for the tuck tab rounding and clearances, mechanically identical in function to the base template.

Additional notes

Insert clearance for small parts

If packing multiple small items, consider how they will settle into the pointed corners of the triangle. Custom inserts may be needed to keep items centered.

Related Packaging

C10.10.90.20: Triangular Carton With Rosette Closure

A better choice if you want a decorative, interlocking top closure for premium gifting instead of a standard tuck flap.

FAQs

Assembly and Closure

How does a three-sided carton ship flat?

One of the side panels includes a longitudinal collapsing crease. The manufacturer glues the long seam and folds the carton along this crease and one main corner, allowing it to lay completely flat for shipping.

Do the end flaps require tape or glue?

The triangular end flaps feature twin tuck tabs that slide inside the side walls. The friction between the tabs and the walls holds the carton closed. However, clear wafer seals can be added for tamper evidence.

Product Fit

Is this carton suitable for heavy items?

It is a poor fit for heavy products. Because the bottom closure relies on friction, excessive weight can push the bottom flap open. It is a better fit for lightweight specialty items.

Shipping and Route

Is this carton suitable for direct parcel shipping?

The triangular shape and friction closures are not designed for direct parcel shipping. It should be placed inside a rectangular corrugated outer box for transit.

Production

Does the triangular shape affect production?

It is die-cut and glued on folder-gluer machines, but the asymmetric flat-fold profile requires specific belt and guide setups compared to a four-corner box.

Samples

What should be tested with a physical sample?

A sample verifies that the twin tuck tabs have the right amount of friction for your chosen board thickness. If the tabs are too tight, they will crush during insertion; if too loose, the carton will open.

Materials

Can corrugated board be used for this design?

Corrugated board is generally a poor fit. The collapsing crease and sharp triangular corners will crush and bind, preventing the carton from folding flat cleanly.

How does grain direction affect this carton?

Grain direction should run parallel to the height of the carton. This provides column strength and prevents the long side panels from bowing outward.