Downgauging Folding Boxboard without Losing Compression Strength
Downgauging folding boxboard demands increasing core bulk and outer ply elastic modulus to preserve caliper and bending stiffness under McKee formula laws.
Paperboard Yield
Area Coverage
The surface area of usable paperboard obtained per unit of weight determines the material cost efficiency for a given thickness. The calculation of paperboard yield is the inverse of the basis weight, expressed as square metres per metric ton of board. This parameter tells a converter how many carton blanks can be produced from a ton of paperboard of a specific caliper.
It does not measure the strength of the board or its printability, but focuses purely on the physical coverage of the material. Consequently, it is a key metric for comparison.
Bulk Relationship
Basis weight and thickness are linked by the density of the board. A higher paperboard yield is achieved when mills produce a bulkier sheet that has a low density. This allows the sheet to maintain its thickness and stiffness while weighing less.
It requires specific pulp types and light calendering.
Economic Value
Buyers evaluate different board options by comparing the area yield rather than just the price per ton. A premium board with a high paperboard yield can cost less per square metre than a cheaper, denser board. This comparison helps converters choose the most cost-effective substrate for a job.
It is standard practice in packaging procurement.