kraftliners

Kraftliners are a type of kraft paper used primarily in the manufacture of corrugated cardboard. Kraft paper itself is known for its strength, achieved through the kraft process, which involves the chemical pulping of wood. This process breaks down lignin, the substance that binds wood fibers together, resulting in a stronger, more durable paper. Kraftliners are typically made from virgin wood pulp, contributing to their superior tear resistance and rigidity compared to papers made from recycled fibers.

There are two main types of kraftliner: brown kraftliner and white kraftliner. Brown kraftliner is the natural color of the kraft paper and is commonly used as the outer facing of corrugated boxes, providing a sturdy surface for printing and handling. White kraftliner is produced by bleaching the brown kraft paper and can be coated for enhanced printability and aesthetic appeal, often used for premium packaging or when a clean, bright appearance is desired.

The primary function of kraftliners in corrugated cardboard is to provide the flat outer surfaces that sandwich the fluted medium. This multi-layered structure, consisting of linerboard and fluting, creates a strong yet lightweight packaging material. The robust nature of kraftliners ensures that corrugated boxes can withstand significant pressure, protect their contents during transit, and are stackable. Their strength and durability make them a fundamental component in the packaging industry for a wide range of products.