7/7/2015 NPTEL::TextileEngineeringTextileTesting

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SAMPLING

Sampling:

Itisnotpossibleordesirabletotestalltherawmaterialorallthefinaloutputfromaproductionprocessbecauseoftimeandcostconstraints.

Manytestsaredestructivesothattherewouldnotbeanymaterialleftafterithadbeentested.Becauseofthis,representativesamplesofthematerialaretested.

Termsusedinsampling:

Consignment:

Thisisthequantityofmaterialdeliveredatthesametime.Eachconsignmentmayconsistofoneorseverallots.

Testlotorbatch:

Thisconsistsofallthecontainersofatextilematerialofonedefinedtypeandquality,deliveredtoonecustomeraccordingtoonedispatchnote.Thematerialispresumedtobeuniformsothatthisisthewholeofthematerialwhose properties are to be characterised by one set of tests. It can be considered to be equivalent to thestatisticalpopulation.

Laboratorysample:

This is thematerial thatwill be used as a basis for carrying out themeasurement in the laboratory. This isderivedbyappropriaterandomsamplingmethodsfromthetestlot.

Testspecimen:

Thisistheonethatisactuallyusedfortheindividualmeasurementandisderivedfromthelaboratorysample.Normally,measurementsaremadefromseveraltestspecimens.

Package:

Elementaryunits(whichcanbeunwound)withineachcontainerintheconsignment.Theymightbebumptop,hanks,skeins,bobbins,conesorothersupportontowhichhavebeenwoundtow,top,sliver,rovingoryarn.

Containerorcase:

Ashippingunitidentifiedonthedispatchnote,usuallyacarton,box,baleorothercontainerwhichmayormaynotcontainpackages.

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