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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.
Butcher paper is a type of kraft paper originally sold to butchers for the purpose of wrapping meat and fish. It is now used for a wide variety of purposes, notably in primary education where it is used for arts and crafts, such as hanging artwork. [1] Many high schools use butchers' paper for posters of clubs, and upcoming events.
A calender is a series of hard pressure rollers used to finish or smooth a sheet of material such as paper, textiles, rubber, or plastics. Calender rolls are also used to form some types of plastic films and to apply coatings. [1] Some calender rolls are heated or cooled as needed. [2] Calenders are sometimes misspelled calendars .
A Fourdrinier paper machine. A paper machine (or paper-making machine) is an industrial machine which is used in the pulp and paper industry to create paper in large quantities at high speed. Modern paper-making machines are based on the principles of the Fourdrinier Machine, which uses a moving woven mesh to create a continuous paper web by ...
Tar paper is a heavy-duty paper used in construction. Tar paper is made by impregnating paper with tar, producing a waterproof material useful for roof construction. Tar paper is similar to roofing felt, [1] historically a felt -like fabric made from recycled rags impregnated with melted asphalt, and today evolving into a more complex ...
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