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Laboratory Tranning For
Color Fastness to Crocking
AATCC Crockmeter Method
1 Specimen Preparation
1.1 Pre-condition test sample & crockmeter cloth.
1.2 Condition test specimen & crockmeter cloth for at least 4 hours by laying each test specimen separately on a perforated shelf.
2 Test Procedure
2.1 Dry crocking:
2.1.1 Prepare specimens >= 50 x 130 mm with long dimension oblique to warp & filling or Wales & courses.
2.1.2 Place test specimen on base of crockmeter with its long dimension along rubbing direction.
2.1.3 Place specimen holder over test specimen.
2.1.4 Mount a crockmeter cloth over the finger in which the weave is parallel to rubbing direction.
2.1.5 Position clip with loops upward.
2.1.6 Lower the covered finger onto the specimen at front end.
2.1.7 Crank it in 10 complete turns at 1 turn/sec.
2.1.8 Remove the crockmeter cloth for conditioning & evaluation.
2.2 Wet crocking:
2.2.1 Wet a crockmeter cloth to 65%.
188.8.131.52 Weigh dry crock square.
184.108.40.206 Using a syringe tube, draw up water in mL to 0.65times weight of crocking square, lay crocking square on white plastic mesh over a dish.
220.127.116.11 Apply water evenly over crocking square and weigh the wet square.
18.104.22.168 Calculate wet pickup. If needed, adjust the amount of water and using a new square, when 65%pickup is achieved, record the amount water used.
22.214.171.124 Apply the recorded amount of water for other square, repeat this process each day.
2.2.2 Proceed step 2.1.1 to 2.1.8
3.1 Conditioning the specimen
3.2 Remove extraneous fibrous material.
3.3 Back the test cloth with 3 layers of crockmeter cloth.
3.4 Rate dry & wet crocking fastness by Grey Scale for Staining.
4. Trainee’s Performance & Assessment Result
4.1 Performance Excellent Average Poor
4.1.1 Understanding of principle & technique
4.1.2 Application of techniques&use of equipment
4.1.3 Efficiency in performing job
4.1.4 Capability of interpret test results
4.1.5 Capability of work independently
4.1.6 Others:( )
4.2 Assessment Result
Proficient, can train others
Competent, can perform independently
Intermediate, can perform under supervision
Inadequate, further training required