Textiles Part 41

The light weight cla.s.s generally consists of covert cloths in lighter colors for spring, and cloths usually of the undressed finish from worsted or woolen stock for fall.

The heavy weight cla.s.s generally consists of heavily fulled goods, such as meltons, beavers, naps, etc., which give a heavier and warmer coat for winter use only, and where an exceptionally heavy coat is required, double and treble cloths are occasionally employed.

Examine different kinds of suitings and cla.s.sify them.

TROUSERINGS.--Trouserings are more firmly woven than suitings and are heavier. They invariably have a stripe. The ground shade of the better grade of men's wear fabrics is generally composed of twist warp yarns, ranging from dark slate gray to light lavender gray. An endless variety of broad and narrow fine line effects is produced by expert manipulation and combination of weave and silk decorations, producing the pleasing effect required for this cla.s.s of goods. The filling is nearly always black; but sometimes a dark slate is used.

The cheaper grades are generally made of wool and cotton mixtures and twists, down to all cotton, in imitation of the better grades.

OVERCOATINGS.--Overcoatings are heavy woolen or worsted fabrics and heavily teaseled or gigged, giving a rough, hairy appearance. Whether thick or thin, coa.r.s.e or fine, they should always be elastic fabrics, that is, as much so as well fulled woolen goods can be. When hard or stiff they never make a graceful garment. The special goods made for overcoats are nearly all soft goods.

Examine different fabrics and cla.s.sify them into either suitings, overcoatings, trouserings, etc.

=Experiment 59--Characteristics of a Good Silk Fabric=

Materials: Samples of different cheap silk fabrics.

Reference: _Textiles_, pages 203-218.

There are cheap and expensive silk fabrics on the market. The consumer is often tempted to buy the cheaper fabric and wonders why there is such a difference in price. The difference in price is due to the cost of raw material and additional cost is due to the care in manufacturing. For example, raw silk costs from $1.35 to $5 a pound according to its nature, quality, and the country from which it comes.

The cost of throwing silks preparatory to dyeing also varies, the average being 55 cents a pound for organzine or warp, and 33 cents a pound for tram and filling. The prices here also vary according to the nature of the twist imparted to the silk, which is regulated by the kind of cloth it is to enter into. The cost of dyeing varies from 55 cents a pound upwards to perhaps $1.50 a pound, according to the dye and the treatment which the silk is to receive in the process of dyeing. The cost of winding, quilling, and sundry labor items necessary with soft silk prior to its being woven, will perhaps average about a cent per yard of woven goods for the cheapest cloths and range upwards according to the grade of the fabric. The cost of weaving also varies with the cloth, and may be 9 cents for one fabric and 25 cents or more per yard for the more expensive.

Weavers are paid from 2 cents to 60 cents per yard for weaving the different fabrics, and other operations vary greatly in cost; for instance, the cost of printing is entirely dependent upon the work and the number of colors used, whether it is blotch printing, discharge work, or block printing. Different processes in finishing have widely varied costs. At the present time moire work is done which costs as high as 25 cents per yard. There are also other materials which can be finished for as little as 1/2 cent per yard. Some goods have to be finished over and over again in the dyeing and finishing while others are very simply done. Many printed goods are handled 150 times after they come from the loom.

When it comes to relative values of similar goods produced by different manufacturers there are a few general principles by which good construction can easily be determined. Most pure dye fabrics when burned will rather shrivel and boil than burn, while those which are weighted heavily with metallic salts will simply char and turn white without losing the structure of the fabric.

A fabric in which the quant.i.ty of warp and filling are of equal weight gives the maximum strength for the amount of material used. For the same weight and material, that having the most bindings of warp and filling will give the greater service. Fabrics with an insufficient number of warp or filling threads slide easily and do not give good service, though sometimes fashionable. A fabric having a twist in the warp and filling will last longer than one using the same amount of silk and the same binding with less twist.

All of these things may be taught to women many times over, but if the fashion demands an article which breaks all of the above laws and is everything that it should not be, they will buy it in preference to a serviceable fabric. As a general rule, the consumer will be safest in buying goods produced by houses of good reputation and whose products are well known.

A large part of the retail value of silk goods is their fashion demand and is quite independent of their cost of production. For instance, at the present time crepe fabrics, brocades, and prints are commanding a premium while such goods as plain taffetas could not be sold for the cost of production.

The advantages of the better kinds of silks over the cheap ones are pure dye, long wear, and more expensive manufacturing.

=Experiment 60--How to Determine the Count of Yarn in Cloth=

Apparatus: Scales, ruler.

Material: Samples of fabrics.

Reference: _Textiles_, pages 144-146.

The United States Government imposes a tax on certain imported fabrics and yarn. In the case of cotton, the rates of duty are to be ascertained according to the average number of the yarns in the condition in which it is imported.

The length of the yarn is to be counted as equal to the distance covered by it in the cloth, all clipped threads to be measured as if continuous and all ply yarns to be separated into singles and the count taken of the total singles; any excessive sizing is to be removed by boiling or other suitable processes. The number of the yarn is the English number of 840 yd. to a lb. for a No. 1 yarn.

The average number of yarn may be found without unraveling the fabric, and is the quotient of the total thread length, by the weight in the proportion of 840 yd. of yarn equaling 8-1/3 grains, which is equivalent to a No. 1 yarn.

The following simple formula may be used:

Multiply the count of threads per square inch by the number of square inches in the sample used, this product to be multiplied by 100; then divide the product thus obtained by the weight of the sample in grains multiplied by 432. The quotient will give the number of the yarn.

For example, take a sample of cotton cloth 4 in. square, which equals 16 sq. in., having 28 warp and 28 woof threads, a total of 56 threads to the square inch, and weighing 8.6 grains. The formula applied would be as follows:

56 16 100 8.6 432 = 24, the number of the yarn.

The formula may be further simplified by weighing a square yard of the cloth and dividing the number of threads per square inch by 1/300 of the weight per square yard in grains.

Find the number of yarn in several cotton fabrics.

=Experiment 61--Study of Fabrics=

A great deal of time should be devoted to the study of standard fabrics so that pupils may be able to recognize them by inspection and know how to test them for adulterants.

This may be done by having the pupils study the fabrics one by one, placing a sample of each in a note-book. Underneath the sample should be written the use of the fabric, the width, the different grades, with prices, wearing qualities, and how the fabric is made. In connection with this work special effort should be made to develop a textile vocabulary so as to be able to discriminate between the different fabrics, to know the types of weaves, and the different kinds of finish, etc. In this way develop the ability to know what materials and colors weave best, the prices which should be paid for strong materials, the amount of material necessary, and the trade names of fabrics which can be depended upon for substantial goods.

Occasional tests in recognizing fabrics should be given by the teacher by placing before the pupils unlabeled fabrics that they have previously studied and have them give the name, approximate price or grade, weave, qualities, etc.

Remnants or small pieces of standard fabrics may be obtained from the leading dry goods stores of the country. Teachers should have on exhibition in cabinets a large display of standard fabrics with a card attached giving the name and use of each.

=Experiment 62--How to Examine a Fabric=

The first thing a buyer of cloth notices in examining the fabrics is the finish. The finish is tested by feeling and seeing. To ill.u.s.trate: broadcloth should have a smooth face and a nap evenly laid. If the finish is in keeping with the character of the cloth, he next examines the fiber of the yarn to see whether it is composed of pure wool or two or more fibers in combination.

Then test the strength of the cloth to see if it will meet the requirements.

A test should be made to tell whether it is poorly dyed or well dyed.

There is no test that can be applied to all colors to ascertain this, neither is it possible to judge by the eye. The best way is to take a small sample of the goods and submit it to the washing and light test.

FOOTNOTES:

[21] Dissecting pin may be made by placing head of pin or needle in a pen holder.

[22] A hand loom consisting of simply a square frame, may be obtained from Hammett & Co., Devonshire Street, Boston, Ma.s.s.

[23] In the case of linen the short fibers separated by combing are called _tow_, and the long fibers _line_.

[24] Absorbents are substances that will absorb readily excess of liquids; they include varieties of chalk, paste of chalk, or fullers'

earth, rough surface of a visiting card, buckwheat flour, crumbs of bread, powdered soapstone, pumice, whiting. These substances are used to great advantage in a.s.sisting to remove stains from delicate fabrics. They absorb the excess of solvent and thus prevent it from spreading.

[25] Alum in this case is called a mordant, which is a substance that will impregnate the cloth with something which will hold the coloring matter. Other mordants are oxides, hydroxides, and basic salts of aluminum, iron, tin, and chromium.

[26] Place a piece of sulphur on a deflagrating spoon and light it by placing it in the flame and allow it to burn. Cover the bottle by means of a gla.s.s plate.

[27] Bleaching powder is prepared by pa.s.sing chlorine gas over layers of slaked lime (lime to which a slight amount of water has been added). Bleaching powder bleaches by having its hypochlorous acid set free, which in turn gives up oxygen, being converted into hydrochloric acid. The French use solutions containing chloride and hypochlorite of soda. They are called Labarraque's disinfecting fluid. A similar solution of a mixture of chloride and hypochlorite is called Eau de Javelle.