Fabric Assurance by Simple Testing（F.A.S.T） Essay

IntroductionObjective measurement is a scientific stylus to get a good down the stairsstand about just about base properties of material. In this lab, FAST system can provide the accurate measurement to show compression, ex tension, flexure and st might of theoretical account. The aim of this leaven is to predict how a fabric will per public figure when made up into a garment. For fabric manufactures,finishers and garment manufacturers, they can use the results of this test as a instauration to do fabric specification, product and physical process development, quality assurance and process control(Giorgio M. Pier, 1995).Experimental2.1 Test MethodologyThe F.A.S.T system, which was developed by the Australian supranational Wool Bureau, consists of three simple instruments and a test method. The FAST-1 compression measuring stick gives a accurate measurement of fabric burdensomeness at mixed loading, and hence surface bed thickness can be considerably calculated. With FAST-2, the fabric bending distance can be measured accord to British Standard (Standard No.BS3356-1961). In this test, bending length is converted into bending inflexibility which plays an important role in fabric handle. FAST-3 is testing for fabric extensibility at various loads. According to the results of this part, the ability of a fabric to tolerate buckling can be revealed.2.2 Details of Samples ExaminedThere are 9 fabric samples (A,B,C,D,E,F,G,H,I) which are all made up by plain-woven. According to the various sizes and types, those nine samples were divided into three groups. Table I shows the difference among those fabrics.2.3 tool & ProcedureIn the test, 5 fabric samples (A,B,C,D,E) are pressed at a lower place two different loads of 2g/ and 100 g/ respectively. The fabric thickness is displayed with a micrometer resolution on the screen. wherefore surface layer thickness can be calculated. First of all, put sample A on the reference surface of apparatus and gi ve a load of 2g/ on the fabric. After perceive the beep sound, make unnecessary down the selective information showed on the screen. Then do the same oation with a load of 100g/, write down the data of T100. Repeat the steps with sample B,C,D,E,F.The FAST-2 works on the cantilever principle,which involves pushing a fabric over a erect edge until it has bent to specified angle of 41.5. 6 samples are test in this part ( submit A,B,C and woof D,E,F) light cut off the road, extending the length of the specimen holder is bending length, which can calculate the bending stiffness. At first, put the sample A on the plane of measurement instrument, then place a pressing plate on it and ensure the apparent motion of sample exceeds 10mm than the plate. Secondly, push the plate and sample forward s pocket-sizedly after the screen shows start. Keeping pushing until the green light turn to red, then push it back to make the light turn green again. hold open down the data on the screen. The other five fabric samples are also tested in this way.FAST-3 extension meter measures the fabric extensibility in warp, weft and bias directions under three fixed low loadings (5g/cm, 20 g/cm, 100 g/cm). Firstly, ensure the whole test is did at a stable place. Put all the weight on integrity side of plate and fix the sample on the apparatus. Then fill thefirst weight (75g), and turn the knob clockwise slowly. After hearing beep sound, extension of E5 is displayed on the screen. Next, remove the second weight (400g), so that E20 can be measured. Finally, removing all weights, get the data of E100. Repeat these trading operations with all 9 samples respectively.Discussion of Results & ConclusionsAfter sorting and analyzing the FAST data, ten of them can be shown on the siroFAST CONTROL CHART FOR TAILORABILITY to assess their properties (as shown on the next page). The fingerprint of E100-1,B2 and G are in the shaded zones which means some potential troubles influenced by that prop erty is indicated. The data of F-1 and F-2 which was calculated from FAST-2 shows the good formability of some(prenominal) warp yarn and weft yarn, so that they will not form puckered seams either during or after sewing. Comparing with E100-1 andE100-2, it is easily to find that weft yarn of wood has a lower extensibility than warp yarn. It means warp sample can move around during cutting, but it also causes problem with sizing, pattern matching at the sewing stage, because E100-1 falls into the danger range. As it was said by Jedda, The parameter of bending inflexibleness relates to the difficulty with which a fabric can be deformed by bending.Bending rigidity is particularly critical in tailoring lightweight fabrics.( Jedda.H 2007) According to the chart, both of warp yarn and weft yarn have a low values of Bending Rigidity which indicates problems in cutting, handling and sewing. Shear rigidity which is calculated from the bias extensibility measured on FAST-3 can reveal the a bility of a fabric to resist buckling. For the bias samples in this test, they will be easily distorted in laying-up, marking and cutting, because the data of G is under the standard.