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Your location: Home > Related Articles > Method of Measuring Color Fastness to Rubbing/Crumbling

Method of Measuring Color Fastness to Rubbing/Crumbling

Author:QINSUN Released in:2023-07 Click:137

Color fastness to rubbing refers to the degree of color fading of dyed fabrics after rubbing, which is divided into color fastness to dry rubbing and color fastness to wet rubbing. It is also referred to as color fastness when rubbed. The Test Method for Textile Color Fastness to Rubbing is one of the methods for measuring the color fastness of textiles and is an important evaluation index for the color fastness of textiles.

The color fastness to rubbing is used to evaluate the resistance of dyes to mechanical Friction. The principle is to rub the textile sample with a dry rubbing cloth and a wet rubbing cloth to assess the degree of soiling of the rubbing cloth.

Contents

1 How to test the rub fastness (depending on ISO 105 x12)1.1 Purpose1.2 Preparation1.3 Sampling1.4 Steps1.5 Evaluation2 The medium for measuring the rubightness2.1 Crockmeter2.2 Rubfastness Tester2.3 Rubfastness Tester3 How to improve colorsor rubfastness?

How to test rubfastness (depending on ISO 105 x12)?Purpose

To measure the resistance of the color of textiles to rubbing and staining on others Materials and representation of the color quality Rub fastness of textiles based on the color difference assessment of staining.

Preparation: Rub fastness tester: rotatable. Contains a friction finger with a diameter of 25±0.1mm, which can rotate 405±3 degrees, and the vertical pressure is 11.1±0.5N. The diameter of the other friction finger is 16±0.1mm and the vertical pressure is the same. Cotton cloth for rubbing: After desizing and bleaching, the cotton fabric does not contain any finishing agent. Cut it into a 50mm x 50mm ± 2mm square. Waterproof sandpaper or a drip net with a stainless steel wire diameter of 1 mm and a mesh sizeof approximately 20mm.

NOTE: When using stainless steel wire or sandpaper, be aware that these may leave marks on the fabric that will affect the final gradation. Sandpaper is best Used when testing textiles.

Gray scale: Used to assess staining and should conform to ISO 105-A03. Sampling If the textile being tested is fabric, the sample size should not be smaller than 25mm x 25mm. If the accuracy of the test is where the required value needs to be high, another sample can be taken for testing. If the textile to be tested is yarn, weave it into a fabric and ensure the size of the sample is no smaller than 25mm x 25mm. Or wrap the yarn in parallel on a cardboard the same size as the sample to form a layer. Place the sample and rubbing cloth at least 4 hours before testinglong in an atmosphere with a temperature of 20 ± 2 °C and a relative humidity of 65 ± 2 %. When conditioning, place the sample and rubbing cloth on a flat mesh or perforated tray, respectively. Certain fabrics like cotton or wool take longer to condition. Preferably also the test is performed under standard atmospheric conditions for textile testing (see ISO). 139).Operating StepsGeneral

Tip the top half of the Open Crock Tester to reveal the rotating rubbing fingers. Mount the sample on the tester base plate next to the vertical rod and place the rubbing area on the rubbing finger. Bring the top of the instrument back to the start of operation position. Rub the cloth at the end of the shaft in contact with the sample. The downward pressure of the vertical axis is 11.1 ± 0.5N. Make sure the length direction of the sample coincides with the stroke direction of the instrument. Linterpose a mesh or waterproof sandpaper The base plate of the tester and the sample were fixed to reduce movement of the sample. The prepared samples were tested in both wet and dry methods.

When testing fabrics of multiple colors, the sampling location should be chosen carefully so that all colors are rubbed off during the test. If the size of each color is large enough, multiple samples must be taken to independently assess the color change. If small areas of color are tested together, the equipment described in ISO 105-X16 can optionally be used.

Dry rubbing

Place the conditioned rubbing cloth on the tester\'s rubbing head, rotate the handle 20 revolutions and the vertical axis 40 turns turns. Rotate the handle at 1 turn/second. Remove the test coupon and condition.

Wet Rub

Weigh the conditioned rubcloth, soak it thoroughly in distilled water and weigh it again. The water content is guaranteed to be 95% to 100%. Follow the dry rub procedure to rub.

Note: The moisture content of the rubbing cloth has a major impact on the result, a different moisture content can be used. For example: A commonly used moisture content is 65 ± 5%.

Drying

Air dry the test cloth.

Scoring Remove excess loose fibers from the sample so as not to affect the score. Apply three coats when evaluating Place a piece of unrubbed white cotton cloth behind the rubbing cloth being tested. Under the standard light source, use the staining gray scale (4.4) to assess the discoloration of the cotton rubbing cloth. The medium for measuring rubbing fastness. Crockmeter

Different crock test methods with different standards. There are electronic crockmeter conforming to ISO 105×12/D02 and Y571M manual crockmeters conforming to AATCC 8/165.

Y571D Electronic Crockmeter

Electronic Crockmeter
Brush loading pressure and size9 ±0.2NCircularΦ16mmSquare19×25.4mmGrinding finger movement range104±3mmShuttle times1-9,999Winch rotation speed60rpm
Manual Crockmeter Y571M
Maximum head travel: 104 mmHead pressurs9NHead dimensionsround : ¢16mmcount range1~99999timesinstrument size700×240×340mmweight15KG
Manual Crockmeter

Rubbing Tester

The JIS Color Fastness Rub Tester Y571J is a Japanese standard that which is mainly used to evaluate and determine the rub fastness of dyed fiber products. This device is compliant with both JIS L0801 and JIS L0849 standards.

Rubbing Tester
Test head weight 2N(200g) Range of motion100mmRecipeROCATING SPEED30RPMPOWER SUPPLYAC220V ± 10% 50Hz 40WInstrument dimensions660×670×640mm (L× W × H) Instrument weight 28kg

Rubbing fastness tester

Y571A-II Electric Aatcc rotary crockmeter for determining the color fastness of textiles for dry and wet rubbing, especially for printer fabrics. Puts 1134g of pressure on a 16mm finger and rotates 1.125 turns clockwise then counterclockwise. The finger is powered electrically. ATCC 116 and ISO 105 X16.

Rub Fastness Tester Y571A

Weight1134gReaming head diameter16±0.1mmTurning the vertical rod after turning1.125 circles, then reverseDimensions250×150×250mmNet weight10KG
 
Y571A Rub Fastness Tester

Rubbing Fastness Tester Y571A-II

Y571A -II Rub Fastness Tester
compression weight 1134g (11.2N) diameter Finger/Rubber HeadФ16±1mmDrive ModeElectric Dimensions 360×180×320mmWeight 10kg

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