Color Fastness To Crocking is the ability to resist color transfer from the surface of a colored fabric to a surface of a test or colorless test fabric due to rubbing effects that may be in dry and wet conditions.
The colored fabric here is a color fastness test piece and the colorless fabric is the fabric specified as a standard fabric used for the evaluation method.
Two common standards for testing Color Fastness To Crocking:
Standard: AATCC- 08
Color Fastness To Crocking is assessed in two dry and wet conditions called dry friction fastness and wet friction fastness.
To test the strength of wet friction, the fabric is wetted with distilled water before friction on the test fabric.
In ISO-105-X12 standard the level of wetting of the test cloth is 100% (Wet pick-up). Whereas according to AATCC-08, the level of soaking in the fabric is 65%. Then evaluate the level of the color transferred from the test fabric to the test cloth or the color of the wire by comparing with the gray scale (Gray scale) mentioned in the previous article.
Likewise for dry friction fastness, the test fabric is rubbed against the dry-proofed test fabric and a comparison of the color gauge with a gray ruler for evaluation.
Color Fastness To Crocking is a staple and always requires performance for all dyed or printed fabrics.
Color Fastness To Crocking depends on the following factors:
The nature of the dye.
The intensity of the dye.
The structure of the textile material also affects frictional strength.
Process of bleaching, dyeing, finishing fabric.
Depending on the respective dye in the fabric, Color Fastness To Crocking will be different. For example, reactive, reconstituted, disperse dyes give very good color fastness, while other dyes such as direct, indigo and pigment give the lowest friction strength. This is due to the different binding mechanisms between dyes and strong fibers. Some colors such as Black, Red, Navy have poor color characteristics because of their chemical structure, the dye molecules are rough, bulky, the molecular size is large compared to the color molecular structure. other colors.
Therefore, to enhance Color Fastness To Crocking, we can use additional color retention agents for some dark colors, in addition to enhancing washing steps and using good surface-active detergents.
On the other hand, fabric structure factors also affect these friction durability properties. The rougher the fabric is, the lower the friction strength (if the same dyeing behavior is the same).
For example: If the friction resistance on a fabric with a structure of 100 x 80/40 x 40 is grade 3.0, it will be grade 2-3 if the fabric structure is 50 x 50/20 x 20.
Therefore, always remember the necessary fabric parameters when negotiating fabric specifications with customers regarding this color fastness.
Color Fastness To Crocking can be achieved under normal conditions:
Dark color: Dry friction resistance: Grade 3-4; Wet friction resistance: 2.0 – 2.5
Average color: Dry friction resistance: grade 4.0 Wet friction resistance: 3.0
Color: Dry color fastness: 4-5; Wet Friction: 3.5 – 4.0