By answering the W questions : why do we textile testing ? What dowel textile testing? When do we test? Who does the test Textile testing? The remaining part of this introductory chapter will deal briefly with the first question why do we test ? It is difficult to classify the reasons for testing because of overlapping > Never the less, some form of classification is a help in getting a broad view of the subject.
The objectives of Textile testing
The objectives of testing: the road along which the research worker travels is characterized by cross roads, bridges, and culs de dax . At each stage there is a choice of direction. The results of testing in research will help the scientist to decide which route to follow next.
What appears to be sound theory is often disproved by experience, and other lines of reasoning must then be pursued.
Selection of raw materials: Raw materials are a relative term; the raw material of the raw material of the spinner is the fiber, the raw material of the weaver is yarn and that of the finisher is cloth. One attribute common to most textile raw materials is their variation in quality. Fibers vary in length color , and fineness ; yarns vary in count , strength and twist ; fabrics vary in threads per inch , freedom from faults and shrinkage . Since prevention is better than cure it is sound policy to test the available raw materials to ensure the smooth running of production processes. Unsuitable material can be rejected or perhaps put to another use .The standards by which raw a material are accepted or rejected must be realistic , otherwise much will be rejected which in fact is good enough , or else large amounts of inferior material will find its way into the flow of production and cues trouble . The testing of fibers is generally not so important when dealing with manmade fibers and manmade continuous filament yarns, because they are supplied to customers requirements and their properties, including length , color and fineness are determined and controlled during their manufacture .
Process control: When processing goes out of control the amount of waste and the number of seconds increase, costs go up, and very often tempers tool. Higher end breakages in spinning and winding departments and excessive loom stops due toward or weft breaks affect the operatives as well as production. A plan of production requires certain standard level to which materials in process must conform. It is impossible to maintain a chosen standard absolutely. Limits on either side of the standard level are calculated and materials whose characteristics fall within these limits are allowed to pass forward to the next process . In a spinning mill the most common characteristic measured is the weight per unit length of the lap. Sliver, roving, or yarn. The nominal bank or cont 5 is decided upon and control limits are calculated from test results. In brief, a quality control scheme is operated.