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ECMA B31.04.00.00

Pre-Glued Webbed-Corner Tray

  • 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

  • Pre-glued side walls for rapid pop-up assembly
  • Webbed corners prevent dry particulate leakage
  • Double-wall interior hides raw board edges

About this product

The B31.04.00.00 is a premium folding carton tray designed for fast assembly and clean presentation. Delivered flat with its long side walls already glued by the converter, the tray pops open quickly on the packing line. The short ends feature webbed, bellows-style corners that fold inward and are locked in place by a fold-over flap, creating a continuous base that prevents crumbs or powders from escaping.

Because the side walls are pre-glued and the end walls fold over, the final tray features clean, rolled top edges and a double-wall interior. This makes it a strong choice for high-end retail displays, bakery assortments, and cosmetic inserts where raw board edges would detract from the product.

Common uses

  • Bakery and pastry assortments
  • Cosmetics and skincare inserts
  • High-end electronics presentation
  • Small hardware or loose parts kitting

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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Primary Packaging and Retail Presentation

Bakery and confectionery

The continuous webbed corners keep crumbs, sugar, and fine powders contained, making this an excellent primary tray for baked goods.

Premium retail inserts

The double walls hide the unprinted side of the board, providing a clean, finished frame for cosmetics, skincare, or electronics.

Small hardware and loose parts

Because the base corners have no open slots, small fasteners, beads, or loose components will not sift out during handling.

Medical and cleanroom kitting

The lack of open corner gaps reduces the chance of external dust entering the base of the tray before it is sealed in a pouch or sleeve.

Bakery, Cosmetics, and Premium Kitting

High-volume manual fulfillment

The pre-glued side walls reduce the time it takes an operator to square the tray compared to fully unglued four-corner designs, speeding up hand-packing lines.

Premium unboxing experiences

The fold-over end walls and pre-glued side walls create rolled top edges all the way around the tray, removing sharp paperboard edges from the customer's view.

Space-constrained packing floors

While delivered flat, the pre-glued format allows operators to pop the trays open quickly without needing complex folding jigs or automated erectors.

When to Consider Unglued or Standard Trays

Heavy transit without an outer box

This is an open tray. It requires a custom sleeve, a separate lid, or placement inside a master shipper to handle parcel or courier networks safely.

Strictly budget-driven manual runs

The pre-gluing stage adds a manufacturing step. If packing labor is abundant or volumes are low, a fully unglued tray might be a more practical choice.

Board Thickness and Assembly Planning

Board caliper and corner binding

Thick boards can cause the webbed corners to bulge, making the end flaps difficult to lock. Crease offsets must be planned carefully if using heavier materials.

Delivery format and storage

Confirm that your facility has the space for knocked-down-flat (KDF) pre-glued trays, which are slightly thicker in the stack than completely unglued flat blanks.

Outer packaging requirements

Determine how the tray will be sealed for transit. As an open-top design, it must be paired with a sleeve, a lid, or a master carton.

Print surface and interior branding

Because the inner walls fold over, they display the printed side of the board on the inside of the tray, allowing for continuous branding without requiring two-sided printing.

Adjusting Lock Friction and Corner Clearance

Locking tab angles

The friction fit of the end walls can be adjusted by changing the bevel angle of the locking tabs, ensuring they hold securely without tearing the board.

Webbed flap offset

The depth of the corner relief cuts can be tuned to accommodate different material thicknesses, preventing the bellows fold from binding.

Wall height proportions

The height of the tray dictates the size of the webbed corners. Very tall trays may require modified corner geometry to ensure the gussets fold flat against the end walls.

Board and packing details

Grain direction planning

To prevent cracking during the 180-degree fold-overs, the paperboard grain direction should typically run parallel to the main fold-over hinges.

Template Variants

B31.04.00.00.a

Features minor geometric adjustments to the locking tabs and corner relief cuts, often used to optimize automated erecting equipment or specific board calipers.

Additional notes

Machine erection compatibility

While this tray is very efficient for hand packing, it is also compatible with plunger-style automated erecting machines. The locking tab clearances can be tuned to match specific equipment tolerances.

Related Tray Styles

FAQs

Assembly and Packing

Does this tray require gluing on the packing line?

No. The side walls are pre-glued by the manufacturer before delivery. Your team simply pops the tray open and folds the end walls over the corners to lock it.

Product Fit and Containment

Will the webbed corners hold liquids?

No. While the continuous webbed corners are excellent for preventing dry powders, crumbs, or small parts from sifting out, the folded board will absorb moisture unless a specific barrier coating is applied.

Board and Material

Can this tray be made from corrugated board?

It is generally a poor fit for corrugated material. The 180-degree folds on the side walls and the complex bellows fold in the webbed corners tend to crush or bind when using thicker flutes. It performs reliably in standard folding carton paperboards.

Shipping and Route

Is this tray ready for parcel shipping?

Not on its own. As an open-top tray, it requires a custom sleeve, a separate lid, or placement inside a secure outer shipping box to handle transit.

Print and Finish

Do I need two-sided printing to have a branded interior?

Often, no. Because the side and end walls fold 180 degrees inward, the primary printed side of the board becomes the visible interior wall, giving a premium look with standard one-sided printing.

Production Route

Why choose a pre-glued tray over an unglued one?

Pre-glued trays require a folder-gluer process during manufacturing, but they greatly reduce the time and labor required for your team to assemble them on the floor.

Storage and Delivery

How is this tray delivered?

It is delivered knocked-down flat (KDF). The long side walls are already glued and folded flat, so the tray takes up slightly more vertical space on a pallet than a completely unglued blank.

Assembly and Packing

How do the end walls stay closed?

The inner end walls feature small locking tabs that friction-fit into slots at the base of the tray. Once folded over the webbed corners, these tabs wedge into place to hold the structure rigid.