English foundation paper

english foundation paper

Guide to Grammar and Writing

The weight of a ream therefore depends on the dimensions of the paper and its thickness. Most commercial paper sold in North America is cut to standard paper sizes based on customary units and is defined by the length and width of a sheet of paper. The iso 216 system used in most other countries is based on the surface area of a sheet of paper, not on a sheet's width and length. It was first adopted in Germany in 1922 and generally spread as nations adopted the metric system. The largest standard size paper is A0 (a zero measuring one square meter (approx. A1 is half the size of a sheet of A0 (i.e., 594 mm 841 mm such that two sheets of A1 placed side by side are equal to one sheet. A2 is half the size of a sheet of A1, and so forth.

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14 Types, thickness and weight main articles: Paper size, grammage, and Paper density card and paper stock for crafts use comes in a fitness wide variety of textures and colors. The thickness of paper is often measured by caliper, which is typically given in thousandths of an inch in the United States and in micrometers (µm) in the rest of the world. 15 Paper may be between.07 and.18 millimetres (0.0028 and.0071 in) thick. 16 Paper is often characterized by weight. In the United States, the weight assigned to a paper is the weight of a ream, 500 sheets, of varying "basic sizes before the paper is cut into the size it is sold to end customers. For example, a ream of 20 lb,.5 in 11 in (216 mm 279 mm) paper weighs 5 pounds, because it has been cut from a larger sheet into four pieces. 17 In the United States, printing paper is generally 20 lb, 24 lb, or 32 lb at most. Cover stock is generally 68 lb, and 110 lb or more is considered card stock. In Europe, and other regions using the iso 216 paper sizing system, the weight is expressed in grammes per square metre (g/m2 or usually just g) of the paper. Printing paper is generally between 60 g and 120. Anything heavier than 160 g is considered card.

Laidlines are very close together. They run perpendicular to the "chainlines which are further apart. Handmade paper similarly exhibits "deckle edges or rough and feathery borders. 13 Applications Paper can be produced with a wide variety of properties, depending on its intended use. For representing value: paper money, bank note, cheque, security (see security paper voucher and ticket For storing information : book, notebook, graph paper, magazine, newspaper, art, zine, letter For personal use : diary, note to remind oneself, etc.; for temporary personal use: scratch paper For. For packaging: corrugated box, paper bag, margaret envelope, packing wrapping Paper, paper string, charta emporetica and wallpaper For cleaning: toilet paper, handkerchiefs, paper towels, facial tissue and cat litter For construction: papier-mâché, origami, paper planes, quilling, paper honeycomb, used as a core material in composite materials. 14 It is estimated that in 1986 paper-based postal letters represented less than.05 of the world's telecommunication capacity, with sharply decreasing tendency after the massive introduction of digital technologies.

english foundation paper

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Sheets are usually cut "long-grain. With the grain parallel to the longer dimension of the sheet. Continuous form paper (or continuous stationery) is cut to width with holes punched at the edges, and folded into stacks. Paper grain All paper produced by paper machines as the fourdrinier Machine are wove paper,. The wire mesh that transports the web leaves a pattern that has the same density along the paper grain and across the grain. Textured finishes, watermarks and wire patterns imitating hand-made laid paper can be created by the use of appropriate rollers in the later stages of the machine. Wove paper does not exhibit "laidlines which are small regular lines left behind on paper when it was handmade in a mould made from rows of metal wires or bamboo.

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english foundation paper

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Pressing the sheet removes the water by force; once the water is forced from the sheet, a special kind of felt, which is not to be confused with the traditional one, is used to collect the water; whereas when making paper by hand, a blotter. Drying involves using air or heat to remove water from the paper sheets. In the earliest days of paper making, this was done by hanging the sheets like laundry; in more modern times, various forms of heated drying mechanisms are used. On the paper machine, the most common is the steam-heated can dryer. These can reach temperatures above 200 F (93 C) and are used in long sequences of more than forty cans where the heat produced by these can easily dry the paper to less than six percent moisture. Finishing The paper may then undergo sizing to alter its physical properties for use in various applications. Paper at this point is uncoated.

Coated paper has a thin layer of material such as calcium carbonate or china clay applied to one or both sides in order to create a surface more suitable for high-resolution halftone screens. (Uncoated papers are rarely suitable for screens above 150 lpi.) coated or uncoated papers may have their surfaces polished by calendering. Coated papers are divided into matte, semi-matte or silk, and gloss. Gloss papers give the highest optical density in the printed image. The paper is then fed onto reels if it is to be used on web printing presses, or cut into sheets for other printing processes or other purposes. The fibres in the paper basically run in the machine direction.

Although large amounts of electrical energy are required to produce mechanical pulp, it costs less than the chemical kind. De-inked pulp Paper recycling processes can use either chemically or mechanically produced pulp; by mixing it with water and applying mechanical action the hydrogen bonds in the paper can be broken and fibres separated again. Most recycled paper contains a proportion of virgin fibre for the sake of quality; generally speaking, de-inked pulp is of the same quality or lower than the collected paper it was made from. There are three main classifications of recycled fibre. Mill broke or internal mill waste  This incorporates any substandard or grade-change paper made within the paper mill itself, which then goes back into the manufacturing system to be re-pulped back into paper. Such out-of-specification paper is not sold and is therefore often not classified as genuine reclaimed recycled fibre, however most paper mills have been reusing their own waste fibre for many years, long before recycling became popular.


Preconsumer waste  This is offcut and processing waste, such as guillotine trims and envelope blank waste; it is generated outside the paper mill and could potentially go to landfill, and is a genuine recycled fibre source; it includes de-inked preconsumer (recycled material that has been. 10 Postconsumer waste  This is fibre from paper that has been used for its intended end use and includes office waste, magazine papers and newsprint. As the vast majority of this material has been printed  either digitally or by more conventional means such as lithography or rotogravure  it will either be recycled as printed paper or go through a de-inking process first. Recycled papers can be made from 100 recycled materials or blended with virgin pulp, although they are (generally) not as strong nor as bright as papers made from the latter. Additives Besides the fibres, pulps may contain fillers such as chalk or china clay, 11 which improve its characteristics for printing or writing. 12 Additives for sizing purposes may be mixed with it or applied to the paper web later in the manufacturing process; the purpose of such sizing is to establish the correct level of surface absorbency to suit ink or paint. Producing paper main articles: Paper machine and papermaking The pulp is fed to a paper machine where it is formed as a paper web and the water is removed from it by pressing and drying.

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Most pulping summary operations using the kraft process are net contributors to the electricity grid or use the electricity to run an adjacent paper mill. Another advantage is that this process recovers and reuses all inorganic chemical reagents. Soda pulping is another specialty process used to pulp straws, bagasse and hardwoods with high silicate content. Mechanical pulping There are two major mechanical pulps: thermomechanical pulp (TMP) and groundwood pulp (GW). In the tmp process, wood is chipped and then fed into steam heated refiners, where the chips are squeezed and converted to fibres between two steel discs. In the groundwood process, debarked logs are fed into grinders where they are pressed against rotating stones to be made into fibres. Mechanical pulping does not remove the lignin, so the yield is very high, 95, however it causes the paper thus produced to turn yellow and become brittle over time. Mechanical pulps have rather short fibres, thus producing weak paper.

english foundation paper

Papyrus is a lamination of natural plant fibres, while paper is manufactured from fibres whose properties have been changed by maceration. 2 Papermaking main article: Papermaking Chemical pulping main articles: kraft process, sulfite process, and soda pulping to make pulp from wood, a chemical pulping process separates lignin from cellulose fibres. This is accomplished by dissolving lignin in a cooking liquor, so that it may be washed from the cellulose ; this preserves the length of the cellulose fibres. Paper made from chemical pulps are also known as wood-free papers not to be confused with tree-free paper ; this is because they do not contain lignin, which deteriorates over time. The pulp can also be bleached to produce white paper, but this consumes 5 for of the fibres; chemical pulping processes are not used to make paper made from cotton, which is already 90 cellulose. The microscopic structure of paper: Micrograph of paper autofluorescing under ultraviolet illumination. The individual fibres in this sample are around 10 µm in diameter. There are three main chemical pulping processes: the sulfite process dates back to the 1840s and it was the dominant method extent before the second world war. The kraft process, invented in the 1870s and first used in the 1890s, is now the most commonly practiced strategy, one of its advantages is the chemical reaction with lignin, that produces heat, which can be used to run a generator.

the most common fibre source was recycled fibres from used textiles, called rags. The rags were from hemp, linen and cotton. 6 A process for removing printing inks from recycled paper was invented by german jurist Justus Claproth in 1774. 6 Today this method is called deinking. It was not until the introduction of wood pulp in 1843 that paper production was not dependent on recycled materials from ragpickers. 6 Etymology further information: Papyrus The word "paper" is etymologically derived from Latin papyrus, which comes from the Greek πάπυρος ( papuros the word for the cyperus papyrus plant. 7 8 Papyrus is a thick, paper-like material produced from the pith of the cyperus papyrus plant, which was used in ancient Egypt and other Mediterranean cultures for writing before the introduction of paper into the middle east and Europe. 9 Although the word paper is etymologically derived from papyrus, the two are produced very differently and the development of the first is distinct from the development of the second.

The oldest known archaeological fragments of the immediate precursor to reviews modern paper date to the 2nd century bce. The pulp paper-making process is ascribed. Cai lun, a 2nd-century ce, han court eunuch. 2, in the 13th century, the knowledge and uses of paper spread from China through the middle east to medieval Europe, where the first water powered paper mills were built. 3 Because paper was introduced to the west through the city of Baghdad, it was first called bagdatikos. 4 In the 19th century, industrialization greatly reduced the cost of manufacturing paper. In 1844, the canadian inventor Charles Fenerty and the german. Keller independently developed processes for pulping wood fibres.

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For other uses, see, paper (disambiguation). Paper is a thin material produced by pressing together moist fibres of cellulose pulp derived from wood, rags or grasses, and drying them into flexible sheets. It is a versatile material with many uses, including writing, printing, packaging, cleaning, and a number of industrial and construction processes. The pulp papermaking process is said to have been developed. China during the london early 2nd century ce, possibly as early as the year 105 ce, 1 by the, han court eunuch, cai lun, although the earliest archaeological fragments of paper derive from the 2nd century bce in China. 2, the modern pulp and paper industry is global, with China leading its production and the United States right behind. Contents, history, main article: History of paper.


English foundation paper
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