Framed 4-Corner Glued Tray

No. The geometry of the inward-folding top flanges and the lack of diagonal wall creases mean the tray remains rigid once glued. It must be formed from a flat blank at the packing site.

While possible for very small prototype runs, hand-folding and gluing the four corners and four top flanges is very inefficient. This design is intended for automated tray-forming equipment.

Solid bleached board (SBS) or folding boxboard (FBB) are strong choices. Heavy corrugated boards can cause the mitered corners of the top flange to bind or crush during folding, requiring special relief cuts.

As an open base, it requires a secondary component. It is typically paired with a clear plastic sleeve, a separate paperboard lid, or shrink wrap for retail presentation.

Inserts are highly recommended. Beyond holding the product, a well-designed insert supports the underside of the top flanges, preventing them from sagging or crushing under top pressure.

Yes. The four corners must be glued during the tray-forming process to hold the walls upright and keep the top frame under tension.

Yes, the flange width can be adjusted to change the visual border or hide more of the internal insert, though wider flanges require careful tuning to stay flat.

This folding carton alternative ships as flat blanks, saving freight volume compared to pre-erected rigid boxes, provided you have the equipment to form them on-site.