Quality control department plays an important role in all types of manufacturing unit. In textile; it has great importance. In knitting, four point system is used to measure the quality of the knit fabric. Quality assurance system consists of two types; they are-
- On line quality assurance system
- Off line quality assurance system
Off line quality assurance system: This type of system consists of quality measuring system when production process is completed. Here, I have described about the quality assurance system of dyeing and finishing unit. All the Off-Line tests for finished fabrics can be grouped as follows:
- Physical tests
- Chemical tests
Physical Tests: Following physical tests are carried out in off line quality assurance system.
- Threads per inch
- Fabric weight
- Width test
- Tensile strength
- Tear strength
- Seam slippage
- Abrasion resistance
- Pilling resistance
- Thermal stability
- Crease resistance
- Stretch ability & growth recovery
- Smoothness appearance
Chemical Tests: Following chemical tests are performed in dyeing and finishing unit of a textile mill.
- Fastness to washing.
- Fastness to light
- Fastness to heat
- Fastness to actual laundering
- Fastness to sea water
- Fastness to Chlorinated water
- Fastness to water spotting
- Fastness to perspiration
Equipments used for test: Various types of machineries and equipment are used during testing. Following equipments are the main instruments for testing. All of the equipments are not manufactured by same manufacturing companies. Various machine manufacturing companies are responsible to provide such types of equipments to the textile mill.
- Spectrophotometer with software (Data color)
- Martindale Abrasion Tester
- Day light box
- Sample dyeing machine (2)
- Iron
- Electric Balance
- Crock meter
- Data color
- Washing m/c
- GSM Tester
- PH meter
So, we should perform off line quality assurance with great care.
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