Fabric Testing || Particulars || Cotton Fabric Sampling

Fabric Testing basics

Need for fabric testing:
For the survival of mankind, there are three essential needs i.e., food, shelter and clothing. Clothing undoubtedly is an important need as it was basically developed to protect humans against harsh weather conditions. Of course, in this modern era appearance and trends play a significant role and the quality is also taken in account. For checking the suitability of the fabric for different end applications such as industrial use or for clothing, it should posses some desirable properties. Therefore, testing of the fabric plays a vital role in the interest of the consumer.
Let us see how fabric is tested for the following quality particulars:

  • Tensile strength
  • Bursting strength
  • Tearing strength
Dimensional characteristics:
  • Length
  • Width
  • Thickness
  • Warp crimp
  • Weft crimp

Threads/ inch:
  • Ends/inch
  • Picks/inch

  • Warp count
  • Weft count

Weight of the fabric:
  • Weight per unit area
  • Weight per unit length

Abrasion resistance and handle:
Handle includes:
  • Stiffness
  • Drape and crease resistance and recovery

Sampling of cotton fabrics:
The objective of sampling of cotton fabric is to notes is physical properties as there is significant increase in the production and export of cotton fabrics. The quality of the fabric depends upon various factors which include type of weave, the properties of the yarn used, and the finishing treatment given. In a fabric the properties of the warp yarn may completely differ from the properties of weft yarn, also the number of threads/inch in weft and warp ways will also differ. Hence, for obtaining accurate and reliable results and to note the brief idea of the fabric which represents both warp and weft ways sampling of cotton is carried out.

Number of tests:
The minimum number of test to be concluded for determination of various properties of fabric depends upon the accuracy with which the properties are to be determined. ISI has also fixed limits of error. For instance, 3% error for 10 ends, picks, length and width is taken. For breaking strength and bursting strength 5 number of tests corresponding to 8% error are taken. For weight determination 10 number of test corresponding to 6% error are taken.
For determination of the physical properties the pieces shall be samples from each lot. The number of bales taken for testing depends upon the size of lot and ISI suggests. The bales shall be selected at random from the lot. From each selected bale, approximately equal number of pieces shall be chosen at random. From each of the piece selected one test specimen shall be taken for determining the various characteristic. While drawing the test specimen care should be taken to exclude a suitable length from both ends of the fabric. The test specimen thus selected shall be subjected to relevant test for determining the different characteristic.

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