AATCC 8 pdf free download

AATCC 8 pdf free download.Colorfastness to Crocking: AATCC Crockmeter Method.
1. Purpose and Scope
1. I This test method is designed to determine the amount of color transferred from the surface of colored textile materials to other surfaces by rubbing It is applicable to textiles made from all fibers in the form of yarn or fabric whether dyed. printed or othenvise colored. It is not recommended for use for carpets or for prints where the singling out of areas may be too small using this method.
I .2 Test procedures employing white test cloth squares. both dry and wet with water, are given.
1 .3 As washing. drycleaning. shrinkage. ironing, finishing. etc.. may affect the degree of color transfer from a material, the test may be made before, after, or before and after any such treatment.
2. Principle
2.1 A colored test specimen is rubbed with white crock test cloth under controlled conditions.
2.2 Color transferred to the white test cloth is assessed by a comparison with the Gray Scale for Staining or the Chromatic Transference Scale and a grade is assigned
3. Terminology
3.1 colorfastness. n.—the resistance of a material to change in any of its color characteristics, to transfer of its colorant(s) to adjacent materials, or both, as a result of the exposure of the material to any environment that might be encountered during the processing. testing. storage or use of the material
3.2 crocking, n—a transfer of colorant from the surface of a colored yarn or fabric to another surface or to an adjacent area of the same fabric principally by rubbing.
4. Safety Precautions
NOTE: These satety precautions are for inforniation purposes only. The precautions are ancillary to the testing procedures and are not intended to be all inclu• sive. It is the user’s responsibility to use safe and proper techniques in handling materials in this test method. Manufacturers MUSt be consulted for specific details such as material safety data sheets and other manufacturer’s recommendations. All OSHA standards and rules must also be consulted and followed
4. 1 Good laboratory praCtices should be tbllowed Vear safety glasses in all laboratory areas.
5. Apparatus and Materials
5.1 AATCC Crockmeter (see 13.2,
13.3 and Fig. I )
5.2 Test Cloth, cut in 50 mm squares (see 13.4).
5.3 AATCC Chromatic transference Scale (see 13.5).
5.4 Gray Scale for Staining (see 13.5).
5 5 White AATCC Textile Blotting Paper (see 13.5).
5.6 Specimen Holder for Crockmeter (see 13.3).
6. Verification
6.1 Verification checks on the opera- Lion of the test and the apparatus should be made routinely and the results kept in a log The following observations and corrective actions are extremely important to avoid incorrect test results where abnormal crock images can result and influence the rating process
6.2 Use an in-house poor crock ing fabric as a calibration specimen and conduct three dry crock tests.
6.2.1 A poor circular image with uneven dye pick-up may indicate the crocking finger needs resurfacing (see 13.6).
6.2.2 A double. elongated image may indicate a loose clip (see 13.6).
6.2.3 A stretched and streaked crock image may be due to mounting the crock square diagonally.
6.14 Scuff marks to the sides of the specimen indicate the loops to the wire clips are positioned downwards and are not high enough to prevent rubbing the specimen surface.
6.15 A streak in the center of the crock cloth image and in the direction of rubbimz may mean the top of the metal base is warped and not flat This will require a brace insert to square up the tester base.
6.2.6 If specimen holders are used. place the holder over the specimen on the tester base. Move the crocking finger on the crocking arm to the mos forward position and observe whether i hits the inside edge of the holder. If this occurs. move the holder slightly forward for all tests Without correction. this problem will cause a dark area on one side of the crocking image.AATCC 8  pdf download.