Pahvi

Pahvi is a rigid sheet material made from cellulose fibers, typically produced by pressing pulp into a thick, flat sheet. In everyday language it is usually called cardboard and comes in several varieties designed for different applications. The term covers both solid board, often referred to as chipboard, and corrugated board, which consists of a fluted middle layer bonded between two liner sheets. Cardboard sheets vary in thickness, commonly from about 0.3 mm to several millimeters, depending on grade and use. Coatings and surfaces may be untreated, coated, waxed, or laminated to improve moisture resistance and printability.

Manufacturing starts with pulp derived from wood fibers or recycled paper. The pulp is refined, formed into a sheet, and then dried and calendered to achieve a smooth, flat surface. For corrugated board, a corrugated medium is formed and glued between two outer liners, creating added rigidity and cushioning.

Uses and applications include packaging, printing substrates, displays, signage, and various crafts. Cardboard is widely used for shipping boxes, cartons, and product packaging because of its combination of light weight, strength, and recyclability. It can be printed, die-cut, or laminated to meet specific design and protection needs.

Recycling and environmental aspects are central to its profile. Cardboard is highly recyclable and is among the most widely collected packaging materials. Reprocessing typically involves pulping and de-inking to produce new paper fibers. The sustainability of cardboard depends on fiber sourcing, coatings, and contaminants; coatings and certain laminates may complicate recycling. Responsible sourcing schemes, such as FSC or PEFC, indicate sustainable fiber origins.