Interfibrillar Swelling Stress Redistribution Analysis for Coated Recycled Fiber Boards
Interfibrillar swelling in recycled board plies generates interface shear stresses that fracture coatings and degrade stacking strength under cyclic humidity.
Recycled Fiberboard
Material Classification
Cellulose packaging materials made predominantly from recovered paper and cardboard represent a major category of industrial packaging. Standard recycled fiberboard is produced by refining, cleaning, and forming secondary fibers into thick, rigid sheets on multicylinder board machines. It is used extensively for shipping boxes, protective partitions, and partition dividers.
Environmental Contribution
Environmental contribution of utilizing recovered fibers is a key driver for the adoption of this board grade in retail logistics. By converting waste paper into recycled fiberboard, manufacturing loops are closed and the demand for virgin wood pulp is reduced. This circular process keeps valuable paper materials out of landfills.
Converting Application
Converting applications for this grade must account for the shorter fiber lengths inherent in recycled feedstocks, which affect the sheet’s tensile and burst strength. Although recycled fiberboard exhibits lower tear resistance than virgin kraft board, its compressibility and stiffness make it highly effective for protective packaging inserts and edge protectors. Multi-ply constructions allow mills to place cleaner, higher-grade fibers on the surface plies to improve printability and glue adhesion.
Standard starch adhesives bond quickly to the porous recycled surface, facilitating high speed laminating and box assembly. By optimizing the refining process, mills can produce durable boards that meet strict stacking strength requirements in transport.