Fabric Shrinkage Test Procedure

 

Fabric dimensional stability refers to the shortening or elongation of fabric length during wearing, washing, storage, etc. Among them, shrinkage is one of the most concerning phenomena. The shrinkage of the fabric not only affects the appearance of the fabric, but may also cause a decrease in performance. Only in this way can it be possible to sew clothes that fit well and are not deformed.

Definition

Shrinkage is a phenomenon in which the length or width of textiles changes after washing, dehydration, drying and other processes in a certain state. The shrinkage of fabric refers to the percentage of fabric shrinkage after washing or soaking in water.
The smallest shrinkage rate is for synthetic fibers and blended fabrics, followed by woolen fabrics, linen fabrics, and cotton fabrics in the middle. Silk fabrics have a greater shrinkage, and the largest shrinkage rates are viscose fiber, artificial cotton, and artificial wool fabrics.

Fabric shrinkage test process (depends on ISO 5077)

Principle
The specimens are conditioned and sized in a specified standard atmosphere before undergoing appropriate washing and drying procedures. After the drying process, rehumidify and measure the dimensions again to calculate the dimensional changes.
Equipment and reagents
Fabric shrinkage tester: Washing shrinkage tester is used for accelerated washing equipment of knitted and woven fabrics. It evaluates the shrinkage rate according to international test methods. It also has 5 washing modes unique to Nike and Adidas brands. The MCU program controller has built-in ten sets of washing programs required by ISO, as well as operator program capabilities; the non-contact capacitive water level meter measures the water level accurately and reliably.
Get more details about fabric shrinkage tester
Precision Tumble Dryer: It is used to drying after washing. And then to check the fabric quality. A standard domestic tumble dryer recommended by many fabric specifiers ,120 minute timer, 5kg load, reversing action, 2 heat settings and 10 minute cooling time. Precision Tumble Dryer with Digital Controller, A standard domestic tumble dryer which has been modified with the addition of an accurate electronic controller to control exhaust temperature to +/-1 degree C and cycle time within one second. Capacity 5kg, reversing action, 10 minute cooling time.
Detergents: Detergents based on ISO 6330.
Measuring platform: A flat measuring platform large enough to accommodate the entire specimen.
Measuring tape or steel tape or fiberglass tape: scaled in mm, should be longer than the longest dimension measured.
Tools that can accurately mark reference points, such as:
a) Colorfast ink, if necessary, use a template with measuring grid;
b) It can produce thin threads of contrasting colors and sew them into the fabric for marking;
c) Hot wire, used to make small holes and mark thermoplastic materials;
d) Staples, (applicable to specimens that are not stirred during testing, such as soaked in water).

More details can be found in https://fyitester.com/.

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