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1 papermaking
papermaking /ˈpeɪpəmeɪkɪŋ/n. [u]● papermaking industry, industria cartaria □ papermaking materials, materie prime per fabbricare la carta. -
2 papermaking raw materials
The English-Russian dictionary of the Pulp and Paper Industry > papermaking raw materials
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3 материалы mpl сырьевые бумажного производства
Словарь по целлюлозно-бумажному производству > материалы mpl сырьевые бумажного производства
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4 Cai Lun (Tsai Lun)
SUBJECT AREA: Paper and printing[br]b. c.57 AD Chinad. c.121 AD China[br]Chinese Director of Imperial Workshops who is usually credited with the invention of paper.[br]He was a confidential secretary to the Emperor. He became Director of the Imperial Workshops and he is said to have invented, or sponsored the invention of, paper around the year 105 AD. Recent studies, however, suggest that paper was already known in China two centuries earlier. The method of making it has hardly varied in principle since that time. The raw materials, then usually old fishing nets and clothing rags, were boiled with water, to which alkali in the form of wood ash was sometimes added. The resulting pulp was then beaten in a stone mortar with a stone or a wooden mallet. The pulp was then mixed and stirred with a large amount of water, and a sieve or mould (formed on a wooden frame carrying a mat of thin reeds sewn together) was dipped into it and was shaken to help the fibres in the layer of pulp to interlock and thus form a sheet of paper. The rest of the process consisted, then as now, of getting rid of the water: the sheets of paper were dried and bleached by leaving them to lie in the sun.Some of China's many inventions were achieved independently in Western Europe, but it seems that Europe's knowledge of papermaking stems from the Chinese. It was not until the eighth century that it passed into the Islamic world and so, first by contact with the Moors in Spain in the twelfth century, into Western Europe.Cai Lun was later made a marquis. Further promotion followed when he was regarded as the god of papermaking.[br]Further ReadingJ.Needham, 1985, Science and Civilisation in China, Cambridge: Cambridge University Press, Vol. V (1): Clerks and Craftsmen in China and the West, 1970.LRD -
5 Crompton, Thomas Bonsor
SUBJECT AREA: Paper and printing[br]b. 1791/2 d. 1858[br]English papermaker and inventor of a, drying machine.[br]The papermaking machine developed by the Fourdrinier brothers in 1807 produced a reel of paper which was cut into sheets, which were then hung up to dry in a loft. The paper often became badly cockled as a result, and ways were sought to improve the drying part of the process. Drying cylinders were introduced, but the first real benefit came from the use of dry felt in Crompton's drying machine. Various materials could be used, but Crompton found that felt made from linen wrap and a woollen weft was best. In 1820 he took out a patent for steam-heated drying cylinders, and in the following year a patent for a cutter to cut the paper reel into sheets. With Crompton's improvements, the papermaking machine assumed its modern form in essentials. In 1839 Crompton installed centrifugal air fans for reciprocating suction pumps in the suction boxes to extract water from the paper on the continuous wire mould. Crompton owned and operated a successful paper mill at Farnworth in Lancashire, supplying the principal merchants and newspaper publishers in London. He was also a cotton manufacturer and, for a time, owned the Morning Post and other newspapers. By the time he died in 1858 he had amassed a considerable fortune.[br]Further ReadingR.H.Clapperton, 1967, The Paper-making Machine, London: Pergamon Press.LRDBiographical history of technology > Crompton, Thomas Bonsor
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6 Bevan, Edward John
[br]b. 11 December 1856 Birkenhead, Englandd. 17 October 1921 London, England[br]English co-inventor of the " viscose rayon " process for making artificial silk.[br]Bevan began his working life as a chemist in a soap works at Runcorn, but later studied chemistry at Owens College, Manchester. It was there that he met and formed a friendship with C.F. Cross, with whom he started to work on cellulose. Bevan moved to a paper mill in Scotland but then went south to London, where he and Cross set up a partnership in 1885 as consulting and analytical chemists. Their work was mainly concerned with the industrial utilization of cellulose, and with the problems of the paper and jute industries. Their joint publication, A Text-book of Paper-making, which first appeared in 1888 and went into several editions, became the standard reference and textbook on the subject. The book has a long introductory chapter on cellulose.In 1892 Cross, Bevan and Clayton Beadle discovered viscose, or sodium cellulose xanthate, and took out the patent which was to be the foundation of the "viscose rayon" industry. They had their own laboratory at Station Avenue, Kew Gardens, where they carried out much work that eventually resulted in viscose: cellulose, usually in the form of wood pulp, was treated first with caustic soda and then with carbon disulphide to form the xanthate, which was then dissolved in a solution of dilute caustic soda to produce a viscous liquid. After being aged, the viscose was extruded through fine holes in a spinneret and coagulated in a dilute acid to regenerate the cellulose as spinnable fibres. At first there was no suggestion of spinning it into fibre, but the hope was to use it for filaments in incandescent electric light bulbs. The sheen on the fibres suggested their possible use in textiles and the term "artificial silk" was later introduced. Cross and Bevan also discovered the acetate "Celanese", which was cellulose triacetate dissolved in acetone and spun in air, but both inventions needed much development before they could be produced commercially.In 1892 Bevan turned from cellulose to food and drugs and left the partnership to become Public Analyst to Middlesex County Council, a post he held until his death, although in 1895 he and Cross published their important work Cellulose. He was prominent in the affairs of the Society of Public Analysts and became one of its officials.[br]Bibliography1888, with C.F.Cross, A Text-book of Papermaking.1892, with C.F.Cross and C.Beadle, British patent no. 8,700 (viscose). 1895, with C.F.Cross, Cellulose.Further ReadingObituary, 1921, Journal of the Chemical Society.Obituary, 1921, Journal of the Society of Chemical Industry.Edwin J.Beer, 1962–3, "The birth of viscose rayon", Transactions of the Newcomen Society 35 (an account of the problems of developing viscose rayon; Beer worked under Cross in the Kew laboratories).RLH -
7 Cross, Charles Frederick
[br]b. 11 December 1855 Brentwood, Middlesex, Englandd. 15 April 1935 Hove, England[br]English chemist who contributed to the development of viscose rayon from cellulose.[br]Cross was educated at the universities of London, Zurich and Manchester. It was at Owens College, Manchester, that Cross first met E.J. Bevan and where these two first worked together on the nature of cellulose. After gaining some industrial experience, Cross joined Bevan to set up a partnership in London as analytical and consulting chemists, specializing in the chemistry and technology of cellulose and lignin. They were at the Jodrell laboratory, Kew Gardens, for a time and then set up their own laboratory at Station Avenue, Kew Gardens. In 1888, the first edition of their joint publication A Textbook of Paper-making, appeared. It went into several editions and became the standard reference and textbook on the subject. The long introductory chapter is a discourse on cellulose.In 1892, Cross, Bevan and Clayton Beadle took out their historic patent on the solution and regeneration of cellulose. The modern artificial-fibre industry stems from this patent. They made their discovery at New Court, Carey Street, London: wood-pulp (or another cheap form of cellulose) was dissolved in a mixture of carbon disulphide and aqueous alkali to produce sodium xanthate. After maturing, it was squirted through fine holes into dilute acid, which set the liquid to give spinnable fibres of "viscose". However, it was many years before the process became a commercial operation, partly because the use of a natural raw material such as wood involved variations in chemical content and each batch might react differently. At first it was thought that viscose might be suitable for incandescent lamp filaments, and C.H.Stearn, a collaborator with Cross, continued to investigate this possibility, but the sheen on the fibres suggested that viscose might be made into artificial silk. The original Viscose Spinning Syndicate was formed in 1894 and a place was rented at Erith in Kent. However, it was not until some skeins of artificial silk (a term to which Cross himself objected) were displayed in Paris that textile manufacturers began to take an interest in it. It was then that Courtaulds decided to investigate this new fibre, although it was not until 1904 that they bought the English patents and developed the first artificial silk that was later called "rayon". Cross was also concerned with the development of viscose films and of cellulose acetate, which became a rival to rayon in the form of "Celanese". He retained his interest in the paper industry and in publishing, in 1895 again collaborating with Bevan and publishing a book on Cellulose and other technical articles. He was a cultured man and a good musician. He was elected a Fellow of the Royal Society in 1917.[br]Principal Honours and DistinctionsFRS 1917.Bibliography1888, with E.J.Bevan, A Text-book of Papermaking. 1892, British patent no. 8,700 (cellulose).Further ReadingObituary Notices of the Royal Society, 1935, London. Obituary, 1935, Journal of the Chemical Society 1,337. Chambers Concise Dictionary of Scientists, 1989, Cambridge.Edwin J.Beer, 1962–3, "The birth of viscose rayon", Transactions of the Newcomen Society 35 (an account of the problems of developing viscose rayon; Beer worked under Cross in the Kew laboratories).C.Singer (ed.), 1978, A History of Technology, Vol. VI, Oxford: Clarendon Press.RLHBiographical history of technology > Cross, Charles Frederick
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8 Mitscherlich, Alexander
SUBJECT AREA: Paper and printing[br]b. 28 May 1836 Berlin, Germanyd. 31 May 1918 Oberstdorf, Germany[br]German inventor of sulphite wood pulp for papermaking.[br]Mitscherlich had an impeccable scientific background; his father was the celebrated chemist Eilhardt Mitscherlich, discoverer of the law of isomorphism, and his godfather was Alexander von Humboldt. At first his progress at school failed to live up to this auspicious beginning and his father would only sanction higher studies if he first qualified as a teacher so as to assure a means of livelihood. Alexander rose to the occasion and went on to gain his doctorate at the age of 25 in the field of mineralogical chemistry. He worked for a few years as Assistant to the distinguished chemists Wöhler in Göttingen and Wurtz in Paris. On his father's death in 1863, he succeeded him as teacher of chemistry in the University of Berlin. In 1868 he accepted a post in the newly established Forest Academy in Hannoversch-Munden, teaching chemistry, physics and geology. The post offered little financial advantage, but it left him more time for research. It was there that he invented the process for producing sulphite wood pulp.The paper industry was seeking new raw materials. Since the 1840s pulp had been produced mechanically from wood, but it was unsuitable for making fine papers. From the mid-1860s several chemists began tackling the problem of separating the cellulose fibres from the other constituents of wood by chemical means. The American Benjamin C.Tilghman was granted patents in several countries for the treatment of wood with acid or bisulphite. Carl Daniel Ekman in Sweden and Karl Kellner in Austria also made sulphite pulp, but the credit for devising the process that came into general use belongs to Mitscherlich. His brother Oskar came to him at the Academy with plans for producing pulp by the action of soda, but the results were inferior, so Mitscherlich substituted calcium bisulphite and in the laboratory obtained good results. To extend this to a large-scale process, he was forced to set up his own mill, where he devised the characteristic towers for making the calcium bisulphite, in which water trickling down through packed lime met a rising current of sulphur dioxide. He was granted a patent in Luxembourg in 1874 and a German one four years later. The sulphite process did not make him rich, for there was considerable opposition to it; government objected to the smell of sulphur dioxide, forestry authorities were anxious about the inroads that might be made into the forests and his patents were contested. In 1883, with the support of an inheritance from his mother, Mitscherlich resigned his post at the Academy to devote more time to promoting his invention. In 1897 he at last succeeded in settling the patent disputes and achieving recognition as the inventor of sulphite pulp. Without this raw material, the paper industry could never have satisfied the insatiable appetite of the newspaper presses.[br]Further ReadingH.Voorn "Alexander Mitscherlich, inventor of sulphite wood pulp", Paper Maker 23(1): 41–4.LRDBiographical history of technology > Mitscherlich, Alexander
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9 Theophilus Presbyter
[br]fl. late eleventh/early twelfth century[br]German author of the most detailed medieval treatise relating to technology.[br]The little that is known of Theophilus is what can be inferred from his great work, De diversis artibus. He was a Benedictine monk and priest living in north-west Germany, probably near an important art centre. He was an educated man, conversant with scholastic philosophy and at the same time a skilled, practising craftsman. Even his identity is obscure: Theophilus is a pseudonym, possibly for Roger of Helmarshausen, for the little that is known of both is in agreement.Evidence in De diversis suggests that it was probably composed during 1110 to 1140. White (see Further Reading) goes on to suggest late 1122 or early 1123, on the grounds that Theophilus only learned of St Bernard of Clairvaulx's diatribe against lavish church ornamentation during the writing of the work, for it is only in the preface to Book 3 that Theophilus seeks to justify his craft. St Bernard's Apologia can be dated late 1122. No other medieval work on art combines the comprehensive range, orderly presentation and attention to detail as does De diversis. It has been described as an encyclopedia of medieval skills and crafts. It also offers the best and often the only description of medieval technology, including the first direct reference to papermaking in the West, the earliest medieval account of bell-founding and the most complete account of organ building. Many metallurgical techniques are described in detail, such as the making of a crucible furnace and bloomery hearth.The treatise is divided into three books, the first on the materials and art of painting, the second on glassmaking, including stained glass, glass vessels and the blown-cylinder method for flat glass, and the final and longest book on metalwork, including working in iron, copper, gold and silver for church use, such as chalices and censers. The main texts are no mere compilations, but reveal the firsthand knowledge that can only be gained by a skilled craftsman. The prefaces to each book present perhaps the only medieval expression of an artist's ideals and how he sees his art in relation to the general scheme of things. For Theophilus, his art is a gift from God and every skill an act of praise and piety. Theophilus is thus an indispensable source for medieval crafts and technology, but there are indications that the work was also well known at the time of its composition and afterwards.[br]BibliographyThe Wolfenbuttel and Vienna manuscripts of De diversis are the earliest, both dating from the first half of the twelfth century, while the British Library copy, in an early thirteenth-century hand, is the most complete. Two incomplete copies from the thirteenth century held at Cambridge and Leipzig offer help in arriving at a definitive edition.There are several references to De diversis in sixteenth-century printed works, such as Cornelius Agrippa (1530) and Josias Simmler (1585). The earliest printed edition ofDe diversis was prepared by G.H.Lessing in 1781 with the title, much used since, Diversarium artium schedula.There are two good recent editions: Theophilus: De diversis artibus. The Various Arts, 1964, trans. with introd. by C.R.Dodwell, London: Thomas Nelson, and On Diverse Arts. The Treatise of Theophilus, 1963, trans. with introd. and notes by J.G.Harthorne and C.S.Smith, Chicago University Press.Further ReadingLynn White, 1962, "Theophilus redivivus", Technology and Culture 5:224–33 (a comparative review of Theophilus (op. cit.) and On Diverse Arts (op. cit.)).LRD
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