PITMAN’S COMMON COMMODITIES AND INDUSTRIES
CARPETS
BY R. S. BRINTON
London Sir Isaac Pitman & Sons, Ltd., 1 Amen Corner, E.C.4 Bath, Melbourne and New York
In treating of carpet manufacture, which involves the employment of looms and other machinery of a complicated nature, I was confronted with the problem, how far it was necessary or desirable to explain and illustrate mechanical devices. Upon consideration, it seemed advisable, having regard to the scope of the book, to avoid as far as possible both descriptions and diagrams of a mechanical nature. A certain standard of mechanical intelligence is assumed in the reader; but this work, like the rest of the series, is intended for the layman; and it is impossible to describe and explain detailed mechanical movements except at considerable length and with the aid of elaborate diagrams. Those who wish to study the technique of the subject in detail are referred to Mr. Fred Bradbury’s book, Carpet Manufacture (F. King & Sons, Ltd., Halifax, 1904), which, though it has not been brought up to date, is a classic for the trade, as all experts are aware. I am indebted to him for the use of several blocks. I have also to acknowledge the courtesy of the Gresham Publishing Co., Ltd., of Chandos Street, Covent Garden, for permission to use a number of blocks from their Textile Industries, which contains some admirable chapters on Carpet Manufacture. My thanks are further due to The Times for permission to utilise some contributions I made to their “Textile Supplement,” published in 1913; while I have received information and helpful criticism from Messrs. Woodward, Grosvenor & Co., Ltd., Messrs. T. & A. Naylor, Ltd., The Victoria Carpet Co., not to mention colleagues and foremen of my own Company, Brintons Limited. For the historical chapter I am indebted to Mr. A. C. Parry, and for particulars of Carpet Trades Unions to Mr. E. Stradling, Mr. Ellis Crowther, and Mr. T. Lindsay. I am conscious of the possibility of errors and omissions, and I should be grateful for any intimation of such, with the view of making the necessary corrections, if a further edition should be required. R. S. BRINTON. Croft House, Kidderminster, 1919.
CARPETS Before the mechanical processes involved in the manufacture of carpets to-day are described, a short sketch of the history of the fabric and the story of its introduction into this country may be of interest. The origin of the weaver’s loom, like that of the potter’s wheel, dates back to the prehistoric times. A loom with its workers is shown in an ancient Egyptian fresco, the date of which is reckoned by antiquarians to be about 3,000 years before the Christian Era. In the grottoes of Benihassan, both spinners and weavers are shown, the weavers working on cloths both plain and of a checked pattern; and both perpendicular and horizontal looms are represented. There were, however, other civilisations beside the Egyptian; and the origin of the carpet must be sought still further to the East, in places where, in spite of the ebb and flow of conquests, it is still made at the present day. Mention is frequently found in ancient records of history of rich hangings, coverings, fine cloths and tapestries, generally the booty of some conqueror; but it is difficult to tell whether some fabric used exclusively as the carpet of to-day is used is included in these lists. The ancient equivalent of the modern carpet or rug was known to the Babylonians, who were, according to Pliny, skilful weavers; and its manufacture was carried on at an early date among the Assyrians and Persians, in China and India, and among the Arabs. The original purpose of the carpet in the East was probably the same in the beginning as it is there, now, at the present day. It was used to give colour to the temple, as a hanging for the tents, a trapping for the saddle, a sitting place for the guest, for a covering of the ground on which to sleep or pray; and its manufacture in any district implied a certain degree of civilisation and luxury. The use of a woven floor-covering seems to be indicated in passages in Homer; and the well-known authority, Sir George Birdwood, cites an account of a banquet given at Alexandria in the third century before the Christian Era by Ptolemy Philadelphus, at which Persian rugs were spread in the King’s tent. Persian carpets were highly valued, and were exported to Greece, and at a later date to Rome. Themistocles, according to Plutarch, “likened a man’s discourse to a rich Persian carpet, the beautiful figures and patterns of which can be shown only by spreading and extending it out; when it is contracted and folded up, they are obscured and lost.” The conquests of Alexander the Great, which extended as far as India, seem to have made the use of the products of the Eastern looms familiar among the Greeks. At a later date the conquests made by the Roman Consuls spread the arts of the East still further into Europe. At a later period still the taking of Constantinople by the Turks drove many skilful artificers to take up their residence in Italy at Venice, Genoa, and Florence, and at some towns in France; and from these centres carpets were still further distributed over Europe. The Crusades brought England into touch with the East; and specimens of carpet were probably introduced by returning knights and their followers; but it is through Spain, a country which acquired the art from the Moors, that they are first known to have come, Queen Eleanor of Castille and her suite introducing them into this country on her marriage to Edward I. Illustrations of carpets are shown in pictures of the time of Henry VIII; and in the time of Elizabeth they were probably in more general use in England than most writers on the subject are accustomed to allow; for direct communication with the East had been opened up by the fearless and enterprising traders and adventurers of those times. In Hakluyt’s Voyages there are the following instructions to a trader about to journey to Persia— “In Persia you shall finde carpets of course thrummed wooll, the best of the world, and excellently coloured; those cities and townes you most repaire to, and you must use meanes to learne all the order of the dying of those thrummes, which are so died as neither raine, wine, nor yet vinegar can staine; and if you may attaine to that cunning you shall not need to feare dying of clothe. For if the colour holde in yarne and thrumme, it will holde much better in cloth. Learne you there to fixe and make sure the colour to be given by logge wood; so shall we not need to buy wood so deare to the enriching of our enemies. Enquire the price of leckar, and all other things belonging to dying. If before you returne you could procure a single good workeman in the arte of Turkish carpet making you should bringe the arte into this Realme, and also thereby increase worke to your company.” Hakluyt’s praise of the Persian carpets was not undeserved, for their manufacture in his time had reached a period of excellence as regards design and workmanship which it has been from time to time the aim of modern manufacturers to reproduce, as far as the conditions and requirements of the present day permit. Many of the best specimens in the museums and collections of New York, London, Vienna, and Paris are attributed to the fifteenth and sixteenth centuries. When Hakluyt wrote there was in existence a carpet at the Mosque of Ardebil, in North-West Persia, which is now in the Victoria and Albert Museum. The date of this carpet is 1540, and experts agree that it belongs to the best period of Persian carpet weaving. There is, unfortunately, no record whether the efforts of Hakluyt and the merchant adventurers of his time to obtain weavers from Turkey or Persia were successful. Carpets do not find a place among the goods to be especially sought after by their agents. As far back as the reign of Henry VIII we read of Cardinal Wolsey obtaining carpets through the Venetian Ambassador; and in that reign Richard Sheldon lent his house to a weaver named Richard Hicks, who produced among other fabrics woven maps of Worcestershire and Oxfordshire, specimens of which are still in existence. In France, Henry IV gave assistance for the manufacture of carpets, and in 1604 there was a strong guild of carpet weavers; but it was not until the reign of Louis XIV that the manufacture was revived at Aubusson and established at Beauvais. The industry had the direct patronage of the French King, and some celebrated fabrics were made. The Revocation, in 1685, of the Edict of Nantes, which for a time had given protection to the Protestants of France, drove a large number of French and Walloon artisans into England and Germany; and the spinning and weaving were among the many industries in this country to be benefited by this influx of skilful workers. In 1701 the carpet weavers of Wilton and Axminster received a charter; but even at an earlier date the manufacture of carpets had been carried on at these places. Both these towns have given their names to distinct fabrics that are now made in many places and countries. Carpet manufacture is no longer carried on at Axminster, where it flourished for about a century; and other places, like Fulham, Moorfields, Exeter, and Frome, where early attempts were made to establish the industry, have long ceased to have any connection with carpet making. About the year 1740, the Earl of Pembroke brought over weavers from France and introduced into Wilton the making of loop-pile or Brussels carpeting. This was followed in due course by the development of the cut-pile fabric which took its name from the place. About the year 1736 the weaving of carpets seems to have been established at Kidderminster, a town which had been connected with the weaving of broadcloth and “flowered stuff” from as far back as the reign of Henry VIII. When the art was first introduced, what is now called Scotch or Kidderminster carpet was made on the old hand-loom; the process of weaving was slow and laborious, and required a man and a boy to each loom. In 1745, Mr. Broom started the manufacture of Wilton and Brussels carpets in the town, bringing over weavers from Tournai. In 1772 the number of carpet looms in the town was 250, and the trade extended to other places in the North of England and Scotland. In 1830 there were nearly 1,100 looms in Kidderminster, and a considerable home and foreign trade had been established. A Parliamentary Paper of that date gave the consumption of wool in the weaving of carpets as one twenty-eighth of the whole quantity of wool produced in the Kingdom. In 1757, Mr. Thomas Moore started the manufacture of carpets in London, and obtained a premium from the Society of Arts for the best imitation of Turkey carpets. As far back as 1778 there was a trade to some extent at Kilmarnock. The original fabric was the two-ply Scotch or Kidderminster carpet. In 1824, an engineer of Kilmarnock introduced the three-ply Scotch carpet, a fabric of three layers of different colours, each of which is brought to the surface according to design; while about the same time Brussels and Velvet pile were also introduced into Scotland. In 1831, the Trustees for Manufactures in Scotland awarded the prize for four Turkey carpets, the first of that type made in Scotland. In the last quarter of the eighteenth century the inventions of Arkwright had been applied to the woollen and worsted industries. Boulton and Watts had put their steam engine on a practical footing, while Cartwright had made a power-loom for the weaving of calico, and had also patented a wool-combing machine. In France, Jacquard was perfecting a device which, when adapted to the carpet loom, was to play an important part in the development of the industry. From the beginning of the nineteenth century, progress, in spite of occasional checks due to general economic conditions, was well maintained; and by the year 1825 the Jacquard mechanism was beginning to replace, both in England and Scotland, the old and complicated harness of the hand-loom. A great increase of trade followed its adoption. Two other important inventions, which had a great influence in extending the scope of the trade, were developed in the thirties of the last century. The one was the development of the tapestry process of printing and weaving carpets by Mr. Whytock, of Edinburgh and Glasgow. This process enabled a greater range of colours to be used than was previously possible, and also allowed a cheaper fabric to be produced. After initial opposition, the process was developed in Scotland; and finally, about the year 1842, Halifax became the centre of the Tapestry weaving. Firms in other towns were licensed, and the process was so widely taken up that in 1850 there were 1,299 Tapestry hand-looms at work in England and Scotland, as against 2,500 hand Brussels looms. The other notable invention was that of Mr. James Templeton, of Glasgow, who in 1839 patented a novel device for the manufacture of patent Axminster carpets by a two-fold process. This also admitted of a large range of shades. The invention has since been considerably developed, and has contributed largely to the extension of the carpet industry. From small beginnings, early in the nineteenth century the manufacture of carpets had grown in the course of 50 years to an important industry in the United States, and was well established in Philadelphia and other centres. Both in England and America the most able inventors had turned their attention to the problem of weaving by power. Mr. Collier, who had been successful in weaving linen by power, produced, in conjunction with Messrs. Crossley, of Halifax, a loom for the weaving of Tapestry and Brussels. The problem had, however, been solved by Mr. E. P. Bigelow, in America, and the Bigelow patent was acquired by Messrs. Crossley. The introduction of the power-loom created a great change in the industry. The transition period from hand-weaving to power-weaving was a period of anxiety to manufacturers and of privation to the old hand-loom weavers; but the situation was everywhere faced, and from the first introduction of power-loom weaving ever-increasing quantities of carpets have been woven, both for home consumption and for export. In the seventies of the last century another step forward was the remarkable invention of the Moquette or Royal Axminster loom by Alexander Smith & Sons, of Yonkers, N.Y. This loom was introduced to England by Messrs. Tomkinson & Adam, of Kidderminster; and the invention has caused a still further extension of the carpet trade both at home and abroad. Carpet manufacture is a complicated matter, and involves the use both of various ingenious machines and of a diversity of materials, such as wool, cotton, jute, twine, oil, paper, wire, colours, size, etc. We need only concern ourselves, however, with the more important of these materials, which are yarns made of wool, in the form of worsted or woollen, which are almost invariably used for the surface of a carpet; and yarns made of other fibres, which are used for warp and weft. The wool used for carpet yarns is different from that required for either cloth or hosiery. It need not be so fine and soft, but it should be strong, and in the case of worsted yarn, of fairly long staple, while natural lustre adds to the value. A recent estimate of the sources of wool consumed by the carpet trade allotted 9 per cent. to the British Empire, as much as 40 per cent. to Russia, and the remainder to other countries. Strong British wools, and the coarser stapled fibres from Australia and New Zealand, form the bulk of the first category, while Egyptian and East Indian wools, which are in especial demand for woollen yarns, are responsible for a large proportion of the last. Of other materials that can be and are used for the surface of carpets, mention should first be made of silk. Hand-tufted carpets are sometimes made of silk both in Asia and in Europe, and beautiful effects are obtained; but the cost on the one hand, and the nature of the yarn on the other militate against its being a very suitable material for a floor covering. Carpets made with a silk pile possess a wonderful sheen, especially if hand-woven, so that the tufts lie over at a considerable angle; but the pile possesses no resilience and suffers more from soiling in wear than a wool-pile carpet of a corresponding quality. Mohair is used occasionally for hand-tufted carpets with excellent effect, and it is often employed to great advantage in self-coloured hearth rugs, for which there is a regular demand. The extreme stiffness of the fibre and its disinclination to felt, however, cause the yarn to be a rather intractable material for carpet manufacture. It possesses, moreover, the special characteristic of considerable density. In other words, it is heavy for its volume, so that a yarn of a given thickness will weigh much more than a similar yarn of another fibre, with the result that all mohair fabrics are expensive compared with those made of wool or other yarns. Jute is employed for the surface as well as for the rest of the carpet at Dundee; and horse-hair Brussels carpets are made, which are extremely durable, but somewhat harsh, and not very decorative. Yarn spun from cow-hair is utilised sometimes for the surface of carpets of the Brussels or Dutch type, but perhaps more often for filling warps; while cotton has been tried for the former purpose also, but without very satisfactory results, owing to the lack of resilience in its fibre. If to the cobbler there is nothing like leather, so to the carpet manufacturer there is nothing like wool. Yarn made of wool seems to be the ideal material for the surface of a carpet. Wool is capable of being spun easily into yarn of any required count or thickness; and such yarn can be dyed to any shade, and woven into any fabric. When woven, it will retain its appearance and stand reasonably hard wear better than most similar textile materials. Its liability to the attacks of moths may be urged; but, after all, carpets are made as much for use as for ornament, and it is well known that the clothes moth only works when he is undisturbed. Of subsidiary yarns, perhaps cotton is the most important. This is used for a large proportion of the chain warps of all kinds of carpeting. It is also occasionally used for weft, and in its lowest qualities for stuffers. Flax yarn, more generally known in the trade as linen, is used in considerable quantities, especially as chains for Axminster, and as weft for Wilton and Brussels carpets. Its combined strength and pliancy, coupled with a certain degree of stiffness, make it a most useful fibre. Jute and hemp, having regard to the total production of all kinds of carpet, are probably used in greater quantities than any other yarn. Jute is cheap and strong, and is invaluable as a filling to give weight and handle to a fabric. It has the disadvantage of being liable to decay if it becomes wet, and in this state, if used in too large a proportion, of causing the disintegration of a carpet. Of other materials that are sometimes used for the backing of carpets, mention must be made of ramie, which has been tried as a substitute for linen yarn, which it resembles a good deal in character, being strong and pliant, but inelastic. The cost, however, has proved to be prohibitive. Various mixtures of jute and wool, or of cotton and wool, have been tried, and have their values as combining weight with resilience. Paper yarn, though seldom as a matter of fact under its own name, has been tried as a substitute for linen, cotton, and jute, as weft, chain, and stuffer. It can be spun or twisted into a presentable yarn in a variety of counts; and a yarn that will weave and weave well. During the war, owing to their shortage of other fibres, the Germans used considerable quantities of paper yarn for weaving cloths, webbing, harness, equipment, and even carpets, which no doubt served their purposes tolerably well. It was, however, a development pursued rather from necessity than from choice. They had plenty of wood, which we have not; and they lacked the wool, cotton, and jute. Paper yarn cannot seriously compete in price with jute, nor in value with cotton, for use in carpets. It is, moreover, particularly liable to deterioration from dampness. All worsted and woollen yarns used for the surface of carpets, with the exception of those whereon the colours are printed, as in Tapestry carpets, are dyed; and fast and accurate dyeing is of cardinal importance in carpet manufacture. Practically all worsted yarns, and some woollen yarns, however, are supplied to carpet manufacturers by the spinners in oil or in grease; that is to say, still impregnated with the oil which has been put into them in the process of spinning. The freeing of the yarn from this oil by washing is a necessary preliminary to dyeing, inasmuch as the presence of oil would prevent the dye liquor permeating the wool fibres. Scouring is effected by soap and hot water, generally by machines of one type or another. The yarn in skeins is sometimes thrown upon swifts, which revolve over a vat of suds. The skeins are carried through the liquor and well rinsed by the rotation of the swifts. Another method employed is to pass the skeins, tied together in a long chain, through vats in which they are steeped in the suds, and through rollers which squeeze them more or less dry. Or the skeins may travel along a series of aprons, underneath a shower, between rollers, or through bowls of suds. The precise method adopted is not of great importance provided that the scouring solution has full opportunity to operate upon the wool fibres, so that the yarn is delivered ultimately free of oil and of soap. For this reason, a final bath of pure water is desirable. The solvents principally used are ammonia, alkali, and an alkaline soap of some kind. Cotton-seed oil soap is generally regarded as one of the most suitable. The scoured yarn is now ready for dyeing, and passes, without being fully dried, to the sticks or frames of the hand-vat or dyeing machine. The three main considerations to be kept in view in the dyeing of worsted and woollen yarns for carpets are levelness of colour, accuracy of matching, and fastness of colour to light. The second and third are matters which concern the skill of the head dyer and the quality of the dyestuffs which he employs; the first depends upon the handling of the yarn by the operative in the hand vat or dyeing machine; and the essential factor, apart from the proper temperature of the dye-liquor, is motion. Dyeing by hand, although superseded almost entirely by machine-dyeing, is still employed in some cases, particularly where only small quantities are required. The dye-vat is of wood, and should be a well-made piece of joinery to withstand the wear and tear incidental to its use. Round the bottom on the inside is fitted a tube of copper or some acid-resisting metal, perforated with small holes, through which steam is passed to heat up the water. The head dyer weighs out the dyestuffs estimated to produce a shade a fraction below the required shade, so as to admit of final adjustment after testing. This, of course, applies equally to hand or machine-dyeing. For hand vats, the skeins of scoured yarn are hung on a set of poles, which, when filled, are placed on brackets above the vat. When the dyestuff has been put in, and the water brought to the required temperature, a pair of workmen, each holding one end of the poles, standing on each side, sets them on the edge of the vat and lets the free ends of the skeins sink down into the liquor. When all the poles are in place, the operators start on the pole at one end, and, raising each skein in turn, draw it over a few inches, so that the part which has hitherto remained outside the liquor is now immersed. When the skeins on one stick are finished, that stick is pushed a little way along and the next is treated similarly. When the whole set is done, the operation is repeated. The essence of the treatment is to keep the yarn moving. If the skeins were allowed to remain in the same place, even after the first moving, there would be “stick marks” at the point where the skein rested on the pole, because the liquor would not have had as much access to this place as to the rest of the skeins. After an hour or so, or when sufficient time has been allowed for the dyestuffs to permeate the yarn fibres, the poles are lifted on to the brackets, and a skein is taken out and submitted to the head dyer for matching. The head dyer will compare it with his standard, and, in the case of dyeing to match a cut-pile or tufted fabric such as Wilton or Axminster, he will probably make a tuft from a thread of the sample skein, so as to compare the shade of the cut ends as well as of the outside of the thread. He will then make the necessary corrections or additions to the dye-bath if the exact shade has not been reached, and the operation will be continued until he is satisfied. The poles are then finally lifted, removed from above the vat to a horse; the yarn is then stripped from the poles and passed to the hydro-extractor prior to going on to the stove or drying machine. The object of dyeing machines, of course, is to effect the same treatment of the yarn as is done by hand as just described, but in a more expeditious way. A machine can, in fact, do nearly twice as much as a man, and in a more regular manner. That is to say, one man can mind a machine of the same capacity as a hand vat which requires two men; but it is desirable, if not, indeed, necessary, that he should have assistance in loading and unloading. Given the necessity for keeping the yarn in motion while immersed in the dye liquor, the problem of the designer of dye machines has been to find the most simple and effective way of doing this, keeping in view the need for convenience in preparing the yarn for the bath, dropping it in, and removing it. Dyeing machines are of two main types: those which move the yarn through the liquor, and those which move the liquor through the yarn. Each type has in common a frame of some kind to carry the dye-sticks on which the yarn is hung; and practically every type of frame is provided with sticks to support the skeins at one or both ends. Of the former and earlier type the movement of the frame carrying the yarn in the liquor may be effected in various ways. The frame in one machine is revolved in the vat upon a circular axis; in another the revolution is combined with a rocking motion; in a third a vertical movement is obtained by means of a hydraulic pump fitted with an automatic reversing mechanism. In each case the problem of moving the yarn in the liquor is complicated by the minor problems of moving the yarn on the sticks so as to avoid stick marks, and of raising and lowering the frame, or of stripping it in position, if irremovable. The former is solved by some worm or ratchet contrivance for automatically turning the dye-sticks, and the latter by cranes or tackle, or, as in one of the makes just mentioned, by a hydraulic pump. All the machines of this main type have their advantages and disadvantages, as they have their supporters and critics; but there can be little doubt that the balance of opinion among carpet yarn dyers is growing preponderatingly towards the second type of machine; that in which the liquor is moved through the yarn. In this type, the frame carrying the yarn is dropped into the vat, which is then covered with a lid. The liquor is then caused to circulate in a strong stream throughout the vat by propellers fixed at the head. The motion of the propellers can be reversed if desired. If both top and bottom sticks are used in the frame, they are placed at a less distance apart than the length of the skein, so that, the skein being completely immersed, the yarn is carried free of the stick by the flow of the liquor, access is given to all the wool fibres, and the danger of stick marks is avoided. The chief merit of this machine, however, is the considerable economy that is effected in steam consumption by the reduced size of the vat, as well as by the lid. The vat need only be made just large enough to contain the skeins dropped into it, whereas in the other type of machine it must be made large enough to allow for the skeins to be moved about in it. There is, therefore, less water to be heated for a given weight of yarn. The lid avoids loss of heat by radiation, which is inevitable with the open top types. The chemistry and the science of dyeing worsted and woollen yarns is a subject that can only be dealt with adequately at considerable length. Here a brief reference must suffice. Wool fibre is a substance similar in nature to horn, with a scaly surface. It is hygroscopic, being capable of taking up a large amount of water compared to its own bulk, and when moistened and heated it tends to soften and swell. These characteristics make wool very susceptible of being dyed. It is said to have an affinity for certain colouring matters, but this phrase serves to cover a want of agreement among chemists, as to whether dyeing is actually of a chemical or a mechanical nature. It is probably both. In any case, wool is easy to dye compared with silk, cotton, or other fibres. Natural dyestuffs, such as logwood, madder, fustic, cochineal, and indigo, are practically obsolete so far as dyeing for carpet yarns is concerned; and the modern dyer has a large range of aniline and alizarine colours to choose from. As is pretty generally known, the production of dyestuff from coal tar was originally a British invention, but its development passed into the hands of the Germans, upon whom, before the war, the dye consumers of the carpet trade, as of other trades, were very largely dependent. Necessity and enterprise have remedied this deplorable state of affairs, which need never recur. The coal tar dyes now being produced by British dye manufacturers are trustworthy and satisfactory, and they should improve both in quality and quantity as time goes on. For the purposes of the carpet yarn dyer, at any rate, the anilines and alizarines now obtainable are infinitely preferable to any natural or vegetable dyes, being easier to use, more reliable, and faster to light. The ordinary method of preparing the dye-bath into which the worsted or woollen yarn is to be dipped in the manner that has been described, is as follows. The water, in which from 2 to 4 per cent. of sulphuric acid and from 5 to 10 per cent. of Glauber’s Salts is mixed, is brought up to about 170°F.; the dyestuff is added, about 1 to 5 per cent., according to the depth of shade required. The percentages are reckoned upon the weight of the yarn to be dyed. The yarn is then entered, and the water is brought to the boil, and kept lightly boiling as long as required to obtain the shade. There are some delicate shades, however, and some sensitive dyestuffs, for which the yarn requires to be entered cool, and the water to be brought slowly to the boil. The dyed yarn passes from the vat to the hydro-extractor, a large copper pan with perforated sides, which, revolving at a great speed, causes the wet skeins by centrifugal force to press against the circumference and squeeze out a large proportion of the water they contain. The skeins are then taken out, bundled roughly together, and are ready for conveying to the drying room or drying machine. Drying the yarn can be effected simply by hanging the skeins on poles in a room through which strong currents of air are forced by revolving fans. This method, however, depends too much upon the weather, even if the air is caused to pass over steam-heated coils on entering the room. A better alternative is to expose the yarn hung on poles in a heated chamber. The most certain and satisfactory method, however, is a drying machine of some type, which enables the skeins to be fed into it at one end, to pass through a current of heated air, and to be delivered dry at the other. The factors in this case, the heat of the steam coils and the speed of the machine, are known and can be controlled; so that the dyer can rely upon getting a certain quantity of yarn satisfactorily dried in a certain time. In the ordinary type of machine, the skeins are carried horizontally between two wire aprons; but alternatively they can be carried vertically upon hooks or poles. The yarn, coloured and dried, is now ready to go to the yarn store, or direct to the winding-room. |