Tank Collapse at Longview Paper Mill Disrupts Liquid Packaging Supplies
A major plant halt at Longview tightens liquid paperboard supply and pushes beverage carton buyers to alternative suppliers.
Liquid Packaging Board
Barrier Substrate
Multi-ply virgin paperboard engineered with high structural rigidity and food-contact polymer barriers securely holds aseptic and fresh liquid perishables such as milk, juices and broths. Specialized chemical and mechanical processing gives liquid packaging board the wet strength, puncture resistance and scoreline creasability required for high-speed filling lines. Unbleached chemical pulp delivers stiffness in internal plies, while bleached outer layers receive direct printing and extrusion coatings.
The technical grade ceases to apply where non-barrier cartons, corrugated boxes or plain solid bleached boards are employed.
Extrusion Processing
Manufacturing facilities apply thin films of low-density polyethylene and functional barrier materials such as aluminium foil or ethylene vinyl alcohol to the raw baseboard through high-temperature extrusion lamination. The polymer layers prevent moisture penetration, product leakage and external oxygen ingress, while the paperboard matrix provides mechanical stacking strength for filled cartons. Baseboard surfaces undergo corona treatment to enhance polymer adhesion, preventing delamination along fold creases during converting.
Precise thickness profiles, moisture levels and grammage control ensure uniform performance through carton form-fill-seal machinery. High-speed flexographic or rotogravure presses print graphic branding onto outer surfaces before reels undergo precision slitting and creasing. Hydrostatic testing, dye stain penetration tests and tensile edge wicking trials confirm that barrier properties remain intact across all converting steps.
Converting Performance
Aseptic carton formers score, fold and heat-seal the laminated board under sterile conditions at rates exceeding thousands of containers per hour. Structural failures, misaligned creases or micro-pinholes in the inner barrier film result in spoilage, leakages and costly product recalls across cold and ambient distribution channels. Premium board grades must withstand refrigeration humidity and drop impacts throughout distribution networks without softening or bursting.
Recycling processes require hydrapulpers to separate the high-value virgin cellulose fibres from the residual plastic and aluminium composite layers. Converter acceptance rests entirely on meeting strict stiffness parameters and gas transmission resistance.