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ECMA B15.07.82.00

Unglued Claw-Lock 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

  • Glue-free mechanical corner locks
  • Ships flat to maximize storage density
  • Compatible with automated tray-forming lines

About this product

This single-wall folding carton tray ships flat and locks into shape without adhesive. The end walls fold over internal dust flaps, using a wavy claw-cut profile to hook the panels together under tension.

Because it uses no gluing, it moves directly from die-cutting to flat delivery. It is widely used in bakery, food service, and lightweight retail environments where trays are formed on demand, either by hand or through automated tray-forming equipment.

Common uses

  • Bakery and fast-food service
  • Lightweight retail assortment
  • Automated tray-forming operations

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 Food Service Tray Applications

Bakery and fast-food service

The open-top format and glue-free construction make this a practical choice for lightweight food items. The flat blanks take up minimal space behind a counter and can be erected quickly as needed.

Lightweight retail assortment

Useful for grouping small, lightweight products on a shelf. The clean interior, free of glue seams, provides an unobstructed presentation for the packed goods.

Confectionery and loose-item grouping

Provides a clean boundary for loose items that do not exert heavy outward pressure on the walls. The single-wall design keeps material usage low while maintaining a neat display.

Component kitting for assembly lines

Can be used to organize lightweight parts for internal manufacturing steps. The trays can be formed on demand and recycled easily without dealing with glued joints.

Fulfillment and Packing Line Setup

Automated tray-forming operations

While it can be folded by hand, this specific lock geometry is frequently run on automated lines where a mandrel plunges the flat blank through a forming cavity, seating the claw locks instantly.

Short-run manual fulfillment

For lower volumes, operators can fold the dust flaps inward and roll the end walls over them to engage the locks. This takes slightly more precision than a standard friction-lock tray to ensure the wavy cuts hook fully.

Flat-storage retail environments

Stores with limited backroom space benefit from receiving these trays completely flat. Staff can assemble them as inventory moves to the floor, avoiding the bulk of pre-glued or nested rigid trays.

When to Consider Double Walls or Lidded Cartons

Heavy products causing base sag

Because the load is carried by four single-thickness walls and a flat base, heavy items can cause the base to bow, which may pull the corner locks out of alignment. Double-wall trays offer better rigidity for heavier payloads.

Parcel and courier transit

This is an open tray. If the product ships through a mixed-carrier network, the tray should be placed inside a master shipper or replaced with a fully enclosed mailer.

Board Choice and Lock Tolerances

Board tear strength and caliper

The wavy claw cuts bend slightly to engage and hold tension without snapping. The chosen paperboard should have sufficient tear resistance, and the lock clearances should be matched to the exact board thickness to prevent binding.

Erection method and packing speed

Knowing whether the trays will be formed by hand or by machine helps determine the required lock tolerances and whether the packing line setup matches the order size.

Print surface and interior visibility

Since the tray is folded from a single unglued sheet, both the inside and outside surfaces are fully accessible during printing. This allows for continuous branding across the base and inner walls.

Outer shipping and master carton fit

If these trays are grouped for distribution, their external dimensions dictate the master carton size. The single-wall construction keeps the overall footprint close to the internal volume, saving space on the pallet.

Lock Profile and Dust Flap Adjustments

Locking flap depth and cut offset

The depth of the fold-over flap and the exact position of the wavy cut can be adjusted to change how tightly the tray locks, accommodating different board grades or machine forming requirements.

Dust flap height adjustments

The internal dust flaps provide the anchor for the claw locks. Their height can be modified to ensure the wavy cuts have enough material to hook under, especially if the overall tray depth changes.

Claw cut profile and wave depth

The specific curve of the wavy cut can be tuned. A deeper wave provides a stronger mechanical hold but demands higher tear resistance from the paperboard during assembly.

Board and packing details

Die-cutting precision for lock engagement

The wavy profile of the claw lock involves precise rule bending during die-cutting. Consistent manufacturing ensures the locks engage smoothly without tearing the dust flaps.

Claw Lock Style Variants

Rounded tongue locks (B15.07.82.00.b)

Instead of a continuous wavy cut, this variant uses distinct rounded tabs that fold around the corners and insert into receiving slots on the adjacent walls.

Additional notes

Tear resistance at the locking cuts

The mechanical lock places tension directly on the wavy cuts. Using highly recycled board with low tear strength increases the risk of the locks failing during assembly or handling.

Related Tray and Carton Styles

B15.06.00.55: Cover Closure with Claw Lock

Provides a similar glue-free tray base but includes an integrated cover for full enclosure.

B15.07.82.50: Tuck-In Flap Cover System

Adds a hinged lid with a tuck flap to the basic unglued tray, offering top protection for the contents.

FAQs

Assembly and Packing

Does this tray use glue or tape to hold its shape?

No. The tray relies entirely on mechanical friction. The end walls fold over the internal dust flaps, and the wavy cuts hook underneath them to lock the corners in place.

Can this tray be erected by hand?

Yes. While it is often used on automated tray-forming machines, operators can manually fold the dust flaps and engage the locking panels for short runs or in-store use.

Materials and Print

What type of board works well for this lock style?

Folding boxboard or solid bleached sulphate provides a good balance of stiffness and flexibility. Thicker corrugated boards may cause the intricate claw locks to bind or crush.

Can the inside of the tray be printed?

Yes. Because the tray is formed from a single flat blank without glued seams, both the inside and outside surfaces are easily accessible for printing.

Shipping and Route

Is this tray suitable for shipping products directly to customers?

Not on its own. As an open-top tray, it provides no top protection and relies on friction locks. It should be placed inside a secure outer carton for parcel delivery.

Modifications

Can the height of the tray walls be changed?

Yes, the length, width, and height can be scaled. However, changing the height involves proportional adjustments to the dust flaps and locking cuts to ensure the corners still engage correctly.

Materials and Print

How does board thickness affect the claw lock?

The lock relies on precise clearances to slide over the dust flaps. If the board is too thick, the wavy cuts will bind; if it is too thin, the lock may slip out under tension.

Shipping and Route

How are these trays delivered?

They are delivered completely flat. Since there are no glued seams, they stack densely on pallets, which minimizes shipping volume and storage space.