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  2. Kraft paper - Wikipedia

    en.wikipedia.org/wiki/Kraft_paper

    A roll of kraft paper. Kraft paper or kraft 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.

  3. Paper bag - Wikipedia

    en.wikipedia.org/wiki/Paper_bag

    Kraft paper bags Bag of sugar 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. They carry a ...

  4. Grammage - Wikipedia

    en.wikipedia.org/wiki/Grammage

    Newsprint was used as wrapping paper, and the first paper bags were made from newsprint. The newsprint ream standard also became the standard for packaging papers, even though in packaging papers kraft pulp, rather than ground wood, was used for greater strength. Paper weight is sometimes stated using the "#" symbol. For example, "20#" means ...

  5. Paper chemicals - Wikipedia

    en.wikipedia.org/wiki/Paper_chemicals

    Paper Coating 1) The paper or board 2) The first layer of coating to even out the surface 3) A second layer for an even smoother and whiter surface. Pigments that absorb in the yellow and red part of the visible spectrum can be added. As the dye absorbs light, the brightness of the paper will decrease, unlike the effect of an optical ...

  6. Paper density - Wikipedia

    en.wikipedia.org/wiki/Paper_density

    The density can be calculated by dividing the grammage of paper (in grams per square metre or "gsm") by its caliper (usually in micrometres, occasionally in mils). [1] The "ISO 534:2011, Paper and board — Determination of thickness, density and specific volume" indicates that the paper density is expressed in grams per cubic centimeter (g/cm ...

  7. Kraft process - Wikipedia

    en.wikipedia.org/wiki/Kraft_process

    The kraft process (also known as kraft pulping or sulfate process) is a process for conversion of wood into wood pulp, which consists of almost pure cellulose fibres, the main component of paper. 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 ...

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