Artificial silk

“ Artificial Silk from Silk. On account of the low value of the artificial and the high value of genuine silk, there is a tendency to offer the artificial instead of the pure article. Test: When artificial silk is boiled in 4 per cent potassium hydrate solution it produces a yellow solution, while pure silk gives a colorless solution. ”

“ They feel more like the harsh, loaded silks made from thread which has been chemically weighted. But they are coming into demand more and more for such purposes as the warp and filling of various sorts of fabrics, rugs, silk stockings, and upholstery materials. Here in this country, where electricity is in general use, artificial silk is a blessing, for it serves as a substitute in the insulating of electric light wires, and the manufacture of mantles for lights. ”

“ In fabrics every class of fibre has been called into requisition. Flax, wool, silk, and cotton have been supplemented with the fibres of metal, of glass, of cocoanut, pine needles, ramie, wood-pulp, and of many other plants, leaves and grasses.
Artificial silk is made out of a chemically prepared composition, and the fibres are spun by processes simulating not only the act of the silkworm, but its product in quality. Vandura silk was spun from an aqueous solution of gelatine by forcing it through a fine capillary tube, but it attained little or no practical value. ”

“ Or if silk were preferred, the silks of past centuries were at once thick, firm, soft and pure, quite free from the dress or artificial thickening, by whose aid a silk nowadays tries to look rich when it is not. The oatmeal cloth, diagonal cloth, cotton-backed satin, velveteen and plush, so much used now, are very inferior materials as grounds for needlework to the hand-loom linens and silks on which so large a part of the old embroidery remaining to us was worked. ”

“ If it is a question of the 89fancy stitches, it is required to bring out the features of these with yarns clear in surface and neat in structure so that the eye may follow the intersections of the yarns in the fabric. The silk and artificial silk productions belong to the most highly valued of the ornamental branches of the knitting industry, and these may be utilized to bring out in the clearest effect stitches such as shogged patterns, rib varieties and lace designs where definiteness of stitch and brilliance of colour combine to give results of a high value for elegant garments. ”

“ This product, known as artificial silk, prepared by the three competing processes, was in 1908 an established textile with a total production in Europe of about 5000 tons a year, a quantity which bids fair to be very largely increased by the advent of the viscose process, which will effect a very considerable lowering in the cost of production. ”

“ The history of the artificial silk industry, since its foundation about the year 1890, illustrates curiously the rapidity with which isolated facts, of apparently merely academic interest, are seized upon and adapted to the needs of modern civilisation. ”

“ Silk weavers mostly work in attics, where they can have the best light to distinguish shades of colors, and where the silk, which moisture would damage, can be kept perfectly dry. In Spitalfields, the silk manufacture is mostly carried on by the workmen at their homes, their families assisting. Each child has his own branch, and the wife hers. It is the same case in the making of lace, artificial flowers, embroidery, straw braiding, &c. The strength of silk is greater than that of cotton, flax, or wool. ”

“ The product is not more inflammable than natural silk.
Artificial Ageing Of Silk Fabrics.—To give silk goods the appearance of age, exposure to the sun is the simplest way, but as this requires time it cannot always be employed. A quicker method consists in preparing a dirty-greenish liquor of weak soap water, with addition of a little blacking and gamboge solution. Wash the silk fabric in this liquor and dry as usual, without rinsing in clean water, and calender.
Bleaching Silk.—The Lyons process of bleaching skeins of silk is to draw them rapidly through a sort of aqua regia bath. ”

“ When artificially weighted, silk may have its weight increased to almost any desired extent—from 80 to 200 per cent. increase in weight can be obtained without creating suspicion. When such weighted silk is burnt, instead of forming itself into small black beads or knobs, it burns leaving a distinct ash, which retains somewhat the shape of the original material. Artificial or cellulose silk burns readily and in burning does not give off any odour. ”

“ Blacks on silks are produced both from natural and artificial coloring matters, the former having, so far, retained their pre-eminence despite the recent discoveries of chemists. For various reasons coal-tar colors have never proved successful in dyeing black on silk. ”

“ If the thread breaks, a tiny "faller," such as are used in cotton mills, falls down and stops the machine. The silk must now be twisted, subjected to two or three processes to increase its luster, and dyed,—and if you would like to feel as if you were paying a visit to a rainbow, go into a mill and watch the looms with their smooth, brilliant silks of all the colors that can be imagined. After the silk is woven, it is polished on lustering machines, singed to destroy all bits of free fibers or lint, freed of all threads that may project, and scoured if it is of a light color ”

“ Sewing silk is made by winding and doubling the raw product, then twisting into tram, giving it a slack twist, doubling and twisting in the reverse direction under tension. Machine twist is similar, but three ply.
The principal fabrics made of silk are: silk, satin, plush, chenille, crêpe, crepon, gauze, damask, brocade, pongee, and ribbons. Silk thread and cord are also extensively used. The United States is among the leaders in the manufacture of silk fabrics. ”

“ If silk is employed for the entire fabric, much of it is lost by intersecting on the back, only a tithe of the material being visible on the face. There is no real advantage in having silk on the back of the texture, and fuller effectiveness and greater comfort and weight are attained by bringing a heavier material on to the back, preferably a woollen thread with the silk showing on the face only. The back woollen thread by its bulk gives greater proportional weight and at the same time pushes the silk yarn prominently on to the surface and enables it to exhibit its full lustre. ”

“ Generally speaking there are two large classes into which silk goods may be divided, those in which the threads are colored before weaving and called yarn-dyed goods, and those dyed or printed after weaving and called piece-dyed or printed goods. In dyeing yarns, the silk is first ungummed and cleaned by boiling in soap and water, then washed in cold water. If the thread is to be weighted, as is frequently done, tin salts, iron, or other heavy material is deposited on the fiber. If carried far, this is injurious, making the silk tender and weak. Sometimes there is more weighting than silk. ”

“ After colour in draperies come texture and quality, and these need hardly be discussed in the case of silken fabrics, because silk fibre has inherent qualities of tenacity of tint and flexibility of substance. Pure silk, that is silk unstiffened with gums, no matter how thickly and heavily it is woven, is soft and yielding and will fall into folds without sharp angles. This quality of softness is in its very substance. Even a single unwoven thread of silk will drop gracefully into loops, where a cotton or linen or even a woollen thread will show stiffness. ”

“ Besides, there is the same old problem of the lack of cheap labor. You see, reeling silk is often slow work. Different breeds of silkworm turn out, as you know, different qualities of thread. You wouldn't believe how it varies as to size, cleanliness, lustre, and perfection of filament. The Americans cannot afford to pay people to classify all these varieties; nor stop their machinery at irregular intervals to pick out the imperfections, or slugs, as we call them ”

“ Like other silken textiles, satin seems to have been, in some few instances, interwoven with flat gold thread, so as to make it a tissue: for example, Lincoln had of the gift of one of its bishops, eighteen copes of red tinsel sattin with orphreys of gold. [131]
Though not often, yet sometimes do we read of a silken stuff called, cadas, carda, carduus, and used for inferior purposes. The outside silk on the cocoon is of a poor quality compared with the inner filaments, from which it is kept quite apart in reeling, and set aside for other uses ”

“ For hangings it can be chosen of a loose large texture, and covered with bold work executed in silk, linen thread, or wool, or it can be chosen of the finest thread, and covered with minute delicate stitches; it can be worked equally well in the hand, or in a frame, and usually the more it is handled the better it looks. A thick twisted silk is excellent for big and coarse work on linen, the stitches used being on the same scale, big and bold, and finer silk used sparingly if needed. ”

“ If the old workers could use a pure untwisted floss, surely we can take the trouble to conquer this difficulty and do the same. Twisted silk, if used on a silk ground, should, I think, be rather fine; if thick and much twisted, it stands out in relief against the ground and gives a hard and ropy appearance. I am, in fact, assuming that work on so costly a material as pure thick silk is to be rather fine than coarse. Gold and silver thread is much used with silk, but it is almost impossible to keep the silver from tarnishing. ”

“ Many do not understand the great difference in embroidery silks, and often inferior kinds are sold them by unscrupulous clerks. Corticelli Silk is smooth working, of high luster, and is free from imperfections in stock or finish, while the dyes used are remarkable for brilliancy and absolute fastness of color. Magnificent mills, modern machinery, and sixty years experience in manufacturing silk enable the Nonotuck Silk Company to produce as perfect embroidery silk and floss as can be made. ”

“ If we depended for this upon European mills, the color desired would be out of fashion before the thread arrived.
As to the weaving of silk, it is said that we are obliged to import the very best raw silk, owing to the high price of labor here—poor silk requiring great cost in labor. "It costs five times as much to tic a knot here as in France." In the best silk, the thread is not lumpy; but, in weaving the lumpy thread of poor silk, the weaver is constantly busy picking off the imperfections. ”

“ Throwing. The manufacture in the United States begins with raw silk. We import our raw silk chiefly from Italy, China, and Japan. It is handled here first by the “throwster,” who winds it from the skein and makes various kinds of thread for different purposes.
Raw silk wound on spools in a single thread, and [Pg 207] called singles is often used to make warps (that is, the threads running lengthwise of a piece of cloth) for piece-dyed goods, or cloth which is woven with the gum in the silk, and afterward boiled out and dyed. ”

“ Silk is characterised by its fibres appearing perfectly smooth and cylindrical, without depressions, even under a magnifying power of 160. Its fibres (even when dyed) acquire a permanent straw-yellow colour when steeped in nitric acid of the sp. gr. 1·20 to 1·30. The fibres of white or light-coloured silk are similarly stained by a solution of picric acid. A thread of silk, when inflamed, shrivels and burns with difficulty, evolves a peculiar odour, and leaves a bulky charcoal. By these properties silk is distinguished from cotton and linen. ”

“ A company with large capital has been formed in Paris to work up an invention for coating thread with silk. The invention embraces, according to the "Bulletin des Soies," a chemical process for covering linen or other vegetable threads with amesh of silken matter in a manner similar to that in which metallic objects are plated with gold or silver. The process is dependent on the fact, which has long been known, that silk is soluble in several strong acid preparations. ”

“ Some materials that are to be woven require heavy, loosely twisted thread; others, that which is fine and tightly twisted. And in addition to these differences some thread is not made from pure silk, or even from silk of the best quality; raw silk which is imperfect can just as well be used for certain purposes, or silk that is twisted with a strand of cotton or some other filling. There are a great many qualities and kinds of thread and each one has to be specified. ”

“ The principal use of spun silk is in mixed fabrics, in conjunction with wool, cotton, or raw silk, the spun silk thread generally being used as filling rather than warp. The better grades are made into velvet and plush and various types of knit goods. Although high quality spun silk often has the strength and wearing quality of thrown silk, it never can compete with the latter in regard to lustre. ”

“ Pierre opened his eyes.
"Organzine, for example, is used for the warp of woven silk materials and is generally spun from the best quality raw silk, the threads being firm and strong. Tram, on the other hand, is silk of a second grade and is composed of a greater number [149] of fibres. Many of the mills manufacturing woven silks prefer not to own throwing mills. Often their plants are in large cities where land is expensive and they must economize space; or the manufacturers estimate that they can get thread thrown for them cheaper than they can do it themselves. ”