Common Uses for Flanged Webbed Trays
Top-Sealed Food and Ready Meals
The continuous flange provides a consistent surface for heat-sealing films or gluing flat lids, helping maintain freshness and security during transit.
Crumb and Powder Containment
Because the corners are webbed rather than slotted, there are no gaps at the base. This helps contain fine materials, powders, or bakery crumbs.
Modified Atmosphere Packaging (MAP)
When paired with the right barrier coatings and sealing films, the gapless design helps maintain specific internal environments for perishable goods.
Medical and Sterile Barrier Packaging
The continuous flange allows for a secure, peelable seal, which is often necessary for medical devices or components that require a sterile barrier.
Industry and Packing Contexts
Automated Packing Lines
This tray is usually erected by machine. The equipment forms the webbed corners and supports the flange while the product is loaded and the seal is applied.
Cold Chain and Freezer Storage
For frozen foods, the board and coating can be specified to withstand low temperatures and condensation without compromising the top seal.
High-Speed Retail Food Production
The flat delivery and rapid automated erection make this tray suitable for high-volume food processing where speed and consistent sealing are priorities.
When to Consider Alternative Trays
Manual Packing Operations
Folding webbed corners and sealing a flange by hand is slow and inconsistent. If you pack manually, a standard crash-lock or four-corner glued tray is usually a better choice.
No Top Seal Required
If the product does not need a film seal or flat lid, the flange adds unnecessary footprint. A standard straight-sided tray will save material and pallet space.
Key Decisions for Flanged Trays
Flange Width and Equipment Fit
The width of the top flange should match your sealing equipment's tolerances. Too narrow, and the seal may fail; too wide, and it wastes board.
Board and Coating Selection
Leak resistance depends on the board's coating. You should specify whether the tray needs to resist grease, moisture, or freezing temperatures, and ensure the coating accepts your sealing method.
Corner Radius and Lid Fit
The curve of the rounded corners can be adjusted to match specific drop-in lids or to fit existing outer master cartons.
Web Fold Direction
Depending on the machinery and aesthetic preference, the webbed corner material can be designed to fold flat against the interior or exterior of the side walls.
Flange and Corner Adjustments
Flange Width
The flange can be widened or narrowed to accommodate different sealing heads or lid gluing requirements.
Corner Radius
The rounded corners can be tightened or relaxed to change the internal volume or match a specific lid profile.
Web Fold Direction
The excess material in the webbed corner can be folded inward or outward, depending on product clearance and machinery handling.
Board and packing details
Stacking and Master Shippers
Flanged trays take up a specific footprint. When planning the outer master carton, remember to calculate based on the outer edge of the flange, not the base of the tray.
Lid and Sealing Variations
Separate Flat Lid
The tray can be supplied with a matching flat paperboard lid designed to glue or lock onto the flange.
