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EVC71041

Corrugated Insert with Raised Floor and Buffers

Available in a wide range of custom configurations & material selection.
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Affordable delivery across North America.
Design support, warehousing, testing, assembly available.
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Product details

Top highlights

Suspends products with a raised internal floor
Overlapping panels create double-thick side walls
Requires a master carton to hold its shape

About this product

This corrugated insert acts as a protective internal chassis, suspending fragile or heavy items away from the bottom and sides of a master shipping carton. By folding into a U-shape with overlapping side panels, it creates a raised floor and double-thick lateral buffers that absorb transit shocks.

Because it has no native locks or glue seams, the insert relies entirely on a snug fit within an outer box to hold its shape. It is a strong choice for electronics, glassware, or industrial components that require high crush resistance without the use of custom foam.

Common uses

Electronics shipping
Glassware and cosmetics
Heavy industrial parts needing bottom clearance

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Protective roles for raised-floor inserts

Drop protection for fragile goods

The extended side panels form legs that elevate the central floor. This bottom clearance allows the insert to absorb vertical impacts if the outer carton is dropped, decelerating the product before it hits the ground.

Lateral crush resistance

The side panels fold inward and overlap, creating two-ply corrugated walls on the left and right. This provides significant side-impact buffering and vertical stacking strength inside the master shipper.

Bottom clearance for protruding components

Products with uneven bases, such as motors or hardware with downward-facing valves, can rest on the raised floor while the protruding parts hang safely in the empty space below.

Centering heavy items

Heavy industrial or electronic items can shift during transit and damage the outer box. The double-thick side walls keep the payload centered and distribute the weight evenly across the master carton.

Industries relying on internal chassis packaging

Electronics and component shipping

Heavy or sensitive devices often need physical separation from the outer box walls. This insert provides a rigid corrugated alternative to foam end-caps, keeping the device centered and buffered.

E-commerce parcel delivery

When shipping through mixed-carrier networks, a standard outer box may dent or puncture. The internal chassis takes the brunt of the force, protecting the primary product presentation inside.

Industrial parts and hardware

Dense metal components require strong lateral support to prevent them from bursting through the side of a standard shipping box. The overlapping side buffers provide the necessary reinforcement.

When to consider different internal protection

Standalone shipping needs

This insert cannot be shipped on its own. If you need a self-contained protective package, look at a die-cut mailer with built-in dust flaps and a secure front lock.

High-speed automated packing

Because the side buffers must be folded and held in place while sliding the insert into the outer box, this design requires manual assembly. For automated lines, consider glued trays or simple scored pads.

Clearance, fit, and material choices

Master carton sizing

The insert must fit tightly inside the outer box. If the master carton is too large, the unglued side buffers will splay outward, reducing the structural integrity and protection.

Board flute and fold allowances

While thicker flutes increase cushioning, they also require larger fold allowances. The overlapping side panels must be carefully calculated so they do not bind or bow when folded inward.

Packing line workflow

This insert is delivered flat and requires manual folding. Packers must fold the base, fold the side buffers inward, and hold the assembly together while sliding it into the master carton.

Top closure requirements

The attached lid secures the product from above. If the outer box flaps already press down tightly on the product, the lid might be unnecessary, and a lidless variant could save material.

Adjusting the buffer dimensions

Bottom leg clearance

The height of the legs can be adjusted based on the product weight and fragility. Heavier items may require taller legs or a stiffer board grade to prevent the floor from sagging or crushing upon impact.

Top lid and thumb notch

The attached lid secures the product from above and includes a thumb cut for easy opening. If the outer box already provides sufficient top compression, the lid can be removed to save material.

Side buffer chamfers

The top corners of the inner side walls can be angled or chamfered. This adjustment helps clear specific product features or makes it easier to load the item into the chassis.

Packing details

Blank sprawl and material efficiency

The double-thick side walls require a large, cross-shaped flat blank. While this provides excellent protection, it consumes more corrugated board than simple perimeter partitions and may affect the number of inserts that fit on a single production sheet.

Insert variations

Lidless buffer inserts

For applications where the master carton top flaps provide enough downward retention, similar inserts can be specified without the top lid to reduce board usage.

Additional notes

Master carton fit tolerances

The effectiveness of this insert depends on friction. If the outer box is too loose, the side buffers can shift, compromising the double-wall protection and allowing the product to move.

FAQs

Does this insert require glue or tape?

No. The insert is delivered flat and folded manually. It relies entirely on the tight internal dimensions of your master carton to keep the overlapping side panels locked in place.

How does the raised floor work?

The side panels are cut longer than the front and back walls. When folded inward, these extensions act as legs, suspending the central floor and your product above the bottom of the outer box.

Can this be made in heavy-duty corrugated board?

Yes, but the fold clearances must be carefully adjusted. Because the side walls overlap to form a double thickness, using a heavy C-flute or double-wall board can cause the panels to bind if the template is not sized correctly.

Can I use this as a standalone shipping box?

No. Without an outer carton, the side walls will unfold and the package will not stay closed. It is designed strictly as an internal protective component.

Is this suitable for automated packing lines?

Generally, no. The unglued, multi-step folding process and the need to hold the panels together while inserting it into a master carton make it a manual packing solution.

How do I determine the right leg height?

The necessary bottom clearance depends on the drop risk of your shipping route and the fragility of the item. A common starting point is 15mm, but heavier items may need taller legs to allow for more deceleration during an impact.

How is the insert delivered to the packing facility?

It is delivered flat. Packers fold the base into a U-shape, fold the side buffers inward, and slide the assembled chassis into the master carton before loading the product.

Why are the side walls double-thick?

The side panels fold inward and overlap each other. This two-ply construction provides extra lateral cushioning and increases the vertical stacking strength of the overall package.