High-Speed Packing and Two-Piece Box Bases
Automated filling lines
This tray is often used for machine erection. A plunger pushes the flat blank through a die, snapping the glued walls upright in a fraction of a second before the product is loaded.
Base tray for sliding sleeves
When paired with a straight-tuck carton or open sleeve, this tray creates a premium two-piece presentation box often used for cosmetics, electronics, or confectionery.
High-volume manual packing
Even without machinery, packers can open this tray with one hand. It eliminates the time-consuming process of folding and locking friction tabs.
Retail display bases
The open top allows full product visibility on the shelf. It is frequently used as a base for shrink-wrapped multipacks or paired with a clear plastic lid.
Volume Fulfillment and Retail Bakery
Bakery and fast food
The open top allows for quick, direct loading of baked goods or fast food, while the glued corners ensure the tray does not collapse during handling.
Contract packaging and fulfillment
Operations that charge by the hour or piece benefit heavily from the instant setup, easily offsetting the specialized factory gluing.
Cosmetics and electronics presentation
Brands looking for a rigid unboxing experience often use this glued tray as the sturdy bottom half of a two-piece telescopic box.
Conditions That Point to Unglued or Webbed Trays
If packing labor is not the bottleneck
If you are packing short runs or have excess labor capacity, an unglued self-locking tray avoids specialized 4-corner factory gluing.
If packing fine powders or liquids
The standard glued corners leave small gaps. If leak resistance is a priority, a tray with webbed corners provides a continuous barrier.
Board Caliper, Erection Method, and Covers
Board thickness and fold clearance
Because the short walls fold 180 degrees over the corner tabs, the board thickness should be checked carefully. Thicker boards usually take adjusted crease spacing so the material does not crack or bind.
Automated versus manual erection
If you plan to use an automated tray former, the glue bond and board stiffness should be matched to the speed and force of your specific machinery.
Lid or sleeve pairing
Since this is an open tray, decide early if it will be shrink-wrapped, covered with a clear lid, or slid into a carton sleeve for final transit.
Flat delivery storage space
Despite acting like a rigid tray when open, it ships knocked down flat (KDF). This offers excellent pallet density compared to pre-assembled rigid setup boxes.
Wall Height, Tapers, and Crease Adjustments
Corner tab tapers
The internal tabs can be angled (tapered) to ensure they do not collide with the base creases when the tray is folded flat for delivery.
Wall height ratios
The tray can be configured as a shallow display base or a deep containment bin, provided the walls do not overlap when folded flat.
Layer step crease tuning
The distance between the parallel creases on the short walls can be widened to accommodate thicker corrugated flutes, ensuring the double wall lays flat.
Board and packing details
Stacking strength and wall bowing
Vertical stacking strength relies primarily on the double-thickness short walls. The single-thickness long walls provide containment but can bow outward if the tray is overfilled or subjected to heavy top loads without a rigid lid.
Wall-Thickness Variants
Single double-wall (B42.20.00.00)
Reduces board usage by reinforcing only one of the short walls, useful for specific display orientations.
Four double-walls (B48.20.00.00)
Folds all four walls over for maximum tray rigidity and a clean, premium rolled edge on all sides.
Additional notes
Factory gluing capabilities
Because the corners are glued while the blank is folded flat, this tray is typically run on a specialized 4-corner folder-gluer during manufacturing.
Flat delivery and storage space
The flat delivery state makes it much more efficient to store and transport than pre-assembled rigid setup boxes.
FAQs
Packing and Assembly
Is manual assembly involved?
Folding or locking is not necessary. The tray arrives flat and opens into a rigid shape instantly because the corners are pre-glued at the factory.
Can this tray run on automated equipment?
It is widely used on automated tray-forming lines where a plunger pushes the flat blank through a die to erect it at high speeds.
Comparison
Why choose a glued tray over an unglued friction-lock tray?
Speed. An unglued tray involves a packer manually folding and locking the walls into place. A glued tray opens instantly, saving labor time during fulfillment.
Materials and Print
Can I use corrugated board for this tray?
Corrugated board, typically E-flute or F-flute, can be used, but it takes careful adjustment. The short walls fold 180 degrees over the corner tabs, so the crease spacing should be widened to prevent the material from cracking or binding.
Shipping and Route
Is a lid used for shipping?
As an open-top tray, it provides no upper containment. For parcel or retail transit, it is usually paired with a sleeve, a lid, or packed inside a master shipping carton.
How is the tray delivered?
Despite being pre-glued, the trays are delivered knocked down flat (KDF). This offers excellent pallet density and takes up minimal warehouse space before use.
Materials and Print
What happens if I use a thicker board?
The layer step crease will be adjusted. This widens the hinge on the double-thickness walls so they can fold flat over the corner tabs without tearing the material.
Performance
Can this tray hold heavy items?
The double-thickness short walls provide good vertical stacking strength, but the single-thickness long walls can bow outward if the tray is overfilled. Heavy items may benefit from a rigid outer sleeve to keep the walls straight.
