Cross-wrap packing and structural void fill
Capturing flat rigid products
Screens, glass panels, and framed artwork fit this design. The packer squeezes the flat tube into an oval, slides the item inside, and pushes the corners square. Both ends snap shut around the product in one motion.
Instant structural void fill
Empty space inside large master cartons requires rigid support to prevent crushing. This tube erects instantly into a sealed column that blocks and braces the primary payload.
Edge protection for shallow panels
When shipping wide, thin materials, the dual crash-lock acts as a protective bumper. The enclosed ends keep the panel suspended away from the outer edges of a larger shipper.
Rapid kitting for flat components
Packing manuals, flat brackets, or shallow trays alongside main products. The slide-in loading method allows operators to group flat items quickly before the final squaring motion locks them in place.
Fulfillment, master packing, and electronics shipping
High-speed assembly lines
The double crash-lock eliminates flap folding and taping. It serves a narrow role on the packing floor but drastically reduces handling time for specific flat profiles.
Master carton packing
Operations shipping heavy industrial goods use these empty sealed tubes to fill gaps. They deploy faster than folding complex corrugated inserts.
Electronics and display shipping
Monitors and framed screens require packaging that wraps the edges without applying pressure to the center face. The cross-wrap motion achieves this without secondary tape.
When to choose a standard top-loading base
Top-loading standard products
If the packing team drops multiple items into a box, adds loose void fill, or includes paperwork, the simultaneous closure of this tube blocks them. Compare a standard crash-lock base (FEFCO 0700).
Retail presentation with reclosable lids
The 0722 locks permanently upon erection. If the end user needs to open and reclose the package, compare an auto-bottom with a friction tuck top (FEFCO 0713).
Board thickness, loading workflow, and route planning
Board thickness and flute choice
This mechanism relies on eight separate flaps swinging and interlocking at the exact same time. Heavy single-wall or double-wall boards create too much friction, causing the box to bind. Specify fine flutes, such as E or F flute.
Loading workflow compatibility
Packers cannot load this box vertically. They must slide the product into the partially opened tube before pushing it square. Test this specific motion with physical samples to confirm it actually saves time on the bench.
Production routing and order maturity
Manufacturing this box requires a flatbed die-cutter and a multi-point folder-gluer capable of handling leading and trailing crash-locks simultaneously. This specialized routing makes the package better suited for established repeat programs rather than early prototypes.
Outer sealing for parcel transit
While the ends lock mechanically, severe drops in a courier network can cause the tabs to slip and the ends to open. Physical drop testing determines if the package requires an outer seal or a master shipper.
Clearance, print placement, and sizing
Locking tab clearance
The hooks and notches on both ends tie directly to the exact thickness of the corrugated board. Changing the board grade later requires recalculating the dieline, or the dual locks will jam.
Print placement around diagonal scores
The diagonal creases on the top and bottom flaps do heavy mechanical work during assembly. Heavy, continuous ink coverage directly over these folds can crack under tension.
Length-to-width ratios
The flat tube must be comfortable for one operator to squeeze open. Extreme lengths or widths can make the initial oval-forming step ergonomically difficult on the pack bench.
Board and packing details
Packing trial with the real product
A sample or short packing trial helps check product fit, board behavior, closure feel, insert clearance, and how the package sits at the packing station before repeat ordering.
Additional notes
Reopening the locked ends
The crash-lock tabs are designed for permanent closure upon erection. Reopening the box usually requires tearing the board or destroying the locks, making it unsuitable for products that need to be accessed and re-closed.
Related auto-bottom packaging
FAQs
Packing and Assembly
How do you put a product inside if both ends close automatically?
The packer squeezes the flat tube slightly to form an oval, slides the product in, and then pushes the corners to a full 90-degree square. The ends snap shut around the item in one motion.
Material and Board
Can we use heavy double-wall board for extra protection?
No. The simultaneous movement of the top and bottom crash-locks creates significant friction. Heavy boards cause the mechanism to bind, making the box nearly impossible to square up by hand.
Shipping and Route
Does this box require tape for shipping?
The ends lock mechanically, but severe shocks in a mixed-carrier network can cause the tabs to slip. Standalone parcel shipping usually requires drop testing to see if an outer seal is necessary.
Comparison
How does this differ from a standard auto-bottom box?
A standard auto-bottom (like the 0700) leaves the top open for vertical loading. The 0722 mirrors the crash-lock mechanism on the top, sealing both ends the moment the box is squared.
Packing and Assembly
Can the customer open and reclose the package?
The crash-lock tabs are designed for permanent closure. Reopening the box usually requires tearing the board or destroying the locks, making it unsuitable for reclosable retail use.
Samples and Testing
What should we test before ordering a full run?
Request unprinted structural samples in the exact production board grade. Have the packing team test the physical pop-up force and the slide-in loading workflow.
Packing and Assembly
Why is this package used for void fill?
When shipped flat, it takes up minimal space. On the packing floor, it erects instantly into a rigid, sealed empty column that can block and brace heavy items inside a larger master carton.
Design and Print
Are there restrictions on artwork placement?
Keep heavy ink coverage away from the 45-degree diagonal creases on the end flaps. These folds undergo high tension when the box snaps open, which can crack thick layers of ink.
