Grade Classification
Multi-ply containerboards manufactured from selected recycled paper stocks provide reliable structural strength and moderate print surfaces for corrugated packaging applications. The testliner 2 grade defines a standardized European class of recycled linerboard characterized by defined bursting strength and short-span compression metrics. The top ply consists of sorted recovered paper, such as clean corrugated clippings or selected deinked pulp, providing a uniform, continuous surface for flexographic printing.
The lower base plies incorporate mixed recovered paper fibers enriched with native or modified starch to deliver target compression resistance. This grade occupies an intermediate performance tier, positioned between premium virgin kraftliner and lower-specification recycled testliner 3.
Physical Capability
Multi-ply sheet formation enables this containerboard to achieve high internal ply bonding and balanced dimensional stability during corrugated board conversion. Standard specifications for the testliner 2 grade mandate bursting strengths typically ranging between 2.0 and 2.5 kilopascals per grammage unit, alongside established short-span compression test thresholds. Surface sizing applied at the paper machine size press seals surface pores, limiting excessive absorption of water-based flexographic inks and starch corrugating adhesives.
The controlled surface porosity prevents adhesive strike-through and maintains crisp ink transfer during direct post-print operations. The grade demonstrates stable runnability across high-speed corrugators, resisting edge tears and blistering under heated corrugating rolls.
Packaging Utility
Box plants specify this liner grade for outer and inner liners in secondary transit cases, shelf-ready packaging, and industrial shipping containers. The testliner 2 grade delivers dependable stacking strength under moderate warehousing conditions while supporting corporate packaging recyclability targets. When exposed to continuous high humidity or maritime shipping environments, the recycled fibers absorb moisture faster than virgin kraftliner, reducing overall top-to-bottom box compression performance.
Packaging engineers account for these atmospheric limitations by adjusting board grammages or pairing the liner with heavy-duty fluting media. The grade remains a staple raw material for cost-effective, sustainable corrugated box manufacturing.
