ECMA B11.02.00.00

Double-Wall Self-Locking Tray

The ECMA B11.02.00.00 is a premium, unglued folding carton tray that uses four double-thick walls to create a highly rigid, clean-edged presentation. By folding the walls over themselves and trapping webbed corners inside, the design hides all raw material edges and locks securely without adhesive.

Because it relies on a large, cross-shaped blank and a multi-step manual folding sequence, this tray is typically reserved for high-end retail, cosmetics, or confectionery where the unboxing experience justifies the extra material and assembly time.

  • Order custom samples, short runs, or production runs.
  • US-based. Nationwide service.
  • Nationally competitive pricing & delivery costs.
  • Available in a wide variety of configurations.

At a glance

  • Four double walls for premium rigidity and clean rolled edges
  • Unglued friction lock with webbed corners to prevent splaying
  • Requires multi-step manual assembly; delivered flat

Common uses

  • Luxury cosmetics inserts
  • Premium confectionery trays
  • High-end electronics presentation

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Premium Presentation and Rigid Containment

High-End Retail Inserts and Base Trays

The four double walls provide a smooth, finished interior with no raw paperboard edges visible from the top. This makes it a strong base tray for luxury cosmetics, electronics, or premium confectionery when paired with a separate lid or sleeve.

Rigid Containment Without Adhesive

The webbed corners and triangular expansion locks create a tray that resists outward bowing much better than a standard single-wall design. It holds its shape well under the weight of dense products, relying entirely on mechanical folds rather than glue.

Presentation Trays for Baked Goods

The clean interior and lack of adhesive make this tray a strong candidate for bakery and confectionery presentations, provided the board choice aligns with direct or indirect food contact requirements.

Component Separation and Kitting

When used as a master tray inside a larger setup, the rigid double walls provide a stable perimeter for internal dividers, molded pulp inserts, or foam cavities, keeping heavy components separated during handling.

Retail and Luxury Packaging Contexts

Manual Fulfillment Operations

This tray is erected entirely by hand. The sequence involves pre-folding the creases, raising the long walls, collapsing the webbed corners, and locking the short walls down with triangular tabs. It requires operator skill and time, making it best suited for hand-packing lines or premium fulfillment operations rather than automated fulfillment.

Luxury Unboxing Experiences

Brands looking to elevate the presentation of their goods often choose this style because the rolled top edges hide the raw material core. The unboxing feels more substantial and deliberate compared to a standard single-wall tray.

Material Reduction Goals

Because the tray relies entirely on friction locks and expansion tabs, it eliminates the need for adhesive. This can simplify the recycling stream and support broader material reduction goals when paired with the right paperboard.

When to Consider Faster or Lighter Trays

Fast-Paced Packing Lines

If your operation requires rapid setup or automated tray forming, the complex manual folding sequence of this unglued tray will cause bottlenecks. Compare preglued double-wall trays that pop open much faster.

Material Efficiency Priorities

The four double walls and webbed corners create a large, sprawling flat blank. For standard shipping or everyday retail, a single-wall tray or a standard roll-end tray uses less board and may be a more practical choice.

Board Choice, Assembly Labor, and Layout

Board Caliper and Cracking Risk

Because all four walls fold 180 degrees over themselves, the thickness of the board is important. Very thick materials will bind and crack during assembly unless the template is specifically adjusted to accommodate the extra bulk.

Secondary Packaging Needs

This is an open tray. It provides excellent side protection but requires a separate lid, sleeve, or master shipper to enclose the product for transit or retail shelving.

Assembly Labor Allocation

The multi-step folding sequence demands dedicated packing time. Buyers should evaluate whether the premium presentation justifies the manual labor required to erect each tray, or if a preglued alternative makes more sense for the packing team.

Print and Finish Layout

The large fold-over panels offer additional printable surface area on the inside of the tray. Buyers should decide if they want to use this space for branding or instructions, which requires careful registration during production.

Structural Adjustments for Thick Materials

Crease Offsets for Thicker Boards

If specifying a thicker board, the template can be adjusted to offset the inner folding lines. This prevents the inner walls from bowing outward and ensures the triangular locks seat properly against the base.

Locking Tab Angle Modifications

The bevel angle of the short inner walls and the corresponding triangular expansion pieces can be adjusted to increase or decrease the friction lock tension, depending on the stiffness of the chosen paperboard.

Fold-Over Panel Height

The height of the inner fold-over panels can be modified to sit flush with the base or leave a slight gap, depending on whether the tray needs to accommodate a specific insert or if material reduction is a priority.

Board and packing details

Blank Sprawl and Material Layout

The cross-shaped flat blank of a four-double-wall tray creates irregular layouts during production. This affects how many trays fit on a single sheet of material compared to simpler tray styles.

Template Variants

B11.02.00.00.a (Thick Board Variant)

A variant specifically configured with default crease offsets and adjusted locking angles to handle thicker materials without binding.

Additional notes

Operator training for manual folding

The folding sequence must be followed correctly: long walls first, then webbed corners, then short walls. Otherwise, the locks will not seat and the tray will spring open.

FAQs

Assembly and Labor

Can this tray be erected on automated machinery?

No. The sequence of collapsing the webbed corners and seating the triangular expansion locks requires manual manipulation. It is classified for manual erection.

Material and Fit

Why does this tray use a larger flat blank than a standard tray?

To achieve the clean, rolled edges and high rigidity, all four side walls are doubled over, and the corners use extra webbing. This creates a cross-shaped flat blank that requires more material per unit.

Can I use thick corrugated board for this design?

It is generally not recommended without careful structural adjustments. The 180-degree folds and complex corner locks will bind or tear on thick board unless specific crease offsets are applied.

Closure and Shipping

Does this tray need adhesive to stay together?

No. The short inner walls fold over the webbed corners and lock into the base using triangular friction tabs, holding the tray together securely without adhesive.

Is this tray ready for parcel shipping?

No. It is an open-top tray. It must be paired with a lid, sleeve, or placed inside a separate shipping box for parcel transit.

Design and Print

Are the raw edges of the paperboard visible?

No. Because all four walls fold over themselves, the top rim of the tray is completely smooth, hiding the raw edges inside the carton for a premium look.

Material and Fit

How do the webbed corners improve the tray?

The webbed corners connect the adjacent walls without gaps, preventing the corners from splitting under pressure and making the base highly resistant to sifting.

Assembly and Labor

What happens if the folding sequence is done out of order?

If the short walls are folded before the long walls, the corner gussets will not be trapped correctly, and the triangular expansion locks will fail to seat, causing the tray to spring open.

For premium presentations that demand high rigidity and clean edges, the double-wall self-locking tray delivers a high-end feel without adhesive.

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