Four Corner Boxes
A four-corner glued tray that folds up square for bakery, produce, and gift presentation.
Structural & Engineering Details
How This Structure Works
A four-corner box folds up from a flat blank with glued corners so the walls stand square, giving a clean tray-style enclosure for bakery, produce, or gift use. The four corner glue points hold the walls upright, forming a firm well with a tidy interior. The geometry favors open presentation and easy loading, and the glued corners keep the walls from splaying under fill. It can suit items meant to be seen and lifted out, presenting contents neatly while the squared base sits stable on a shelf. Because it ships flat and erects with the corners set, it balances a firm structure with efficient storage.
Good Fit For
- Bakery, produce, and confectionery
- Gift trays and hampers
- Open presentation of grouped items
Key Advantages
- Glued corners hold the walls square
- Open form eases loading and display
- Ships flat and erects into a firm tray
Assembly & Construction
Corner flaps are glued during converting so the flat blank folds up into a squared tray with the four corners holding the walls upright. The open top keeps assembly to erecting the walls, which stand firm once the glued corners set. Packers square the tray and load from above, so the box gains its shape from the corner glue points and holds a tidy interior under an even fill.
Materials & Board Options
A firm paperboard suits lighter four-corner trays where clean folds and print matter, while heavier contents can point to a corrugated grade for wall strength. Final caliper, any flute, and coating typically depend on the load, tray size, print coverage, filling method, and handling in distribution, so a loaded sample usually confirms that the glued corners hold under the intended fill.
Pre-Production Planning Checklist
- Confirm the glued corners hold the walls square under fill
- Check the interior footprint suits the product
- Verify glue tab placement stays clear of visible artwork
