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A roll of kraft paper. Kraft paper or kraft [1] is paper or paperboard (cardboard) produced from chemical pulp produced in the kraft process . Sack kraft paper (or just sack paper) is a porous kraft paper with high elasticity and high tear resistance, designed for packaging products with high demands for strength and durability.
The kraft process involves treatment of wood chips with a hot mixture of water, sodium hydroxide (NaOH), and sodium sulfide (Na 2 S), known as white liquor, that breaks the bonds that link lignin, hemicellulose, and cellulose. The technology entails several steps, both mechanical and chemical. It is the dominant method for producing paper.
Pulping. Chemical pulping involves dissolving lignin in order to extract the cellulose from the wood fiber. The different processes of chemical pulping include the Kraft process, which uses caustic soda and sodium sulfide and is the most common; alternatively, the use of sulfurous acid is known as the sulfite process, the neutral sulfite semichemical is treated as a third process separate from ...
Paper bag. Traditional paper bags made from reused newspaper in India. A paper bag is a bag made of paper, usually kraft paper. Paper bags can be made either with virgin or recycled fibres to meet customers' demands. Paper bags are commonly used as shopping carrier bags and for packaging of some consumer goods.
International Paper is the world's largest pulp and paper maker. Paper mill Mondi in Ružomberok, Slovakia. The pulp and paper industry comprises companies that use wood, specifically pulpwood, as raw material and produce pulp, paper, paperboard, and other cellulose-based products. Diagram showing the sections of the Fourdrinier machine.
Paperboard is a thick paper -based material. While there is no rigid differentiation between paper and paperboard, paperboard is generally thicker (usually over 0.30 mm, 0.012 in, or 12 points) than paper and has certain superior attributes such as foldability and rigidity. According to ISO standards, paperboard is a paper with a grammage above ...
Wood-free paper is made from a variety of raw materials, including Tissue pulp: This is the most common type of wood-free paper. It is made from wood pulp that has been treated with chemicals to remove the lignin. Balsa pulp: This is a type of wood pulp that is made from balsa trees.
Tree-free paper. Tree-free paper, also known as no tree paper, offers an alternative to traditional wood-pulp paper [1] due to its unique raw material [2] composition. This type of paper is considered more eco-friendly especially when evaluating its entire life cycle . Sources of fiber for tree-free paper [3] [4] [5]