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In the daily process of dressing, the most troublesome thing is picking up the clothes when I am anxious to go out in the morning. I often have this trouble. I don't know if you will. Ironing is time-consuming when it is too late. Wrinkle of clothing fabric directly affects its beauty and wearing effect. So, why do clothes wrinkle, and how should we deal with wrinkle prevention in daily life?
So what exactly causes the fabric to wrinkle?
Wrinkling: The phenomenon of creases or wrinkles caused by external forces such as rubbing, squeezing, twisting, and twisting of fabrics in the process of wearing and washing care is called wrinkling.
1. Micro perspective
Under the action of external force, the fibers constituting the fabric are deformed. After the external force is removed, the deformation cannot disappear, cannot be restored to its original state, or can only be partially restored.
2. Macro perspective
Wrinkle formation can be divided into two stages: crease generation and crease recovery after external force removal.
1) Crease generation: Under the action of external force, the fabric is bent and deformed. Since the external force is far greater than the resistance of the fabric due to bending, the fabric is forced to bend and deform, that is, beyond the bending elastic deformation range of the fabric, yielding deformation.
2) Crease recovery
After the external force is removed, the crease bending of the fabric begins to recover under the elastic recovery force generated by the internal stress, that is, the angle of crease recovery starts to increase. With the extension of time, the crease recovery angle increases, and its change is similar to the material creep law.
In this process, in addition to the elastic recovery force of the fabric, it is also affected by the friction resistance, which is generated by the relative slippage between the yarns and between the fibers of the yarn, and its direction is opposite to the elastic recovery force. When the elastic recovery force and friction resistance of the fabric are balanced, the fabric reaches the maximum recovery effect. At this time, the fabric folding angle is the crease recovery angle of the fabric.
Crease resistance of fabrics:
The ability of fabric to resist wrinkling and deformation is called wrinkle resistance, that is, the fabric can be folded and pressurized under specified conditions. After the load is removed, the crease of the fabric can return to the original state to a certain extent, which is also called the crease recovery of the fabric.
It can be seen from the causes of fabric wrinkling that to overcome the shortcomings of fabric wrinkling, it is necessary to reduce the opportunity for fiber to generate relative displacement between macromolecules under external force, or prevent the formation of hydrogen bonds at new positions when macromolecules have relative displacement, so that macromolecules can quickly return to their original positions after the removal of external force.
Crease resistance test
The crease recovery is an important index to evaluate the appearance and wearability of fabrics, which is usually characterized by the crease recovery angle. Under the specified conditions, when the force folded sample is unloaded, after a certain period of time, the angle formed by the two folded surfaces is called the crease recovery angle. The larger the angle, the better the crease resistance of the fabric.
Test principle
Specimens of certain shape and size shall be folded and pressurized for a certain time under specified conditions. After unloading the load, let the sample pass through a certain recovery time, and then measure the crease recovery angle to indicate the crease recovery ability of the fabric.
Instrument used for testing:
AG16-Crease Recovery Tester & Loading Device
AG16-2 AATCC Wrinkle Recovery Tester
The test methods refer to the standards used:
ISO 2313, AATCC 66, BS EN 22313, M&S P22.
AATCC 128, ISO 9867
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