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Address: 2nd Floor, No. 13, Lane 1225, Tongpu Road, Shanghai
A common test method for cloth is the "four-point scale"
In this "four-point scale", the highest score for any single defect is four points. Regardless of the number of flaws in a yard (or meter) of cloth, the score for each straight yard (or meter) of flaws must not exceed four points. The inspector is about 3 feet away from the fabric, the fabric is facing up during the inspection, and it is placed on a running cloth inspector with good lighting conditions. For continuous defects, such as: rungs, edge-to-edge color differences, roll-to-roll color differences, narrow or irregular cloth width, creases, uneven finishing, etc., each yard (or meter) of defects should be evaluated. For four points.
The quarter system is actually the number of defects per hundred square yards (or square meters) converted into "standard defects".
01 scoring criteria
1.For defects in latitude and longitude and other directions, the defect score will be evaluated according to the following criteria
2.Scoring principles for defects
A. All warp and weft defects in the same yard shall not be awarded more than 4 points.
B. For serious defects, each defect will be rated as four points.
For example: regardless of the diameter, all holes and holes will be rated as four points.
C. For continuous defects, such as: rungs, edge-to-edge color differences, narrow seals or irregular cloth width, creases, uneven dyeing, etc., each yard of defects should be rated as four points.
D. No points are deducted within 1 ”of the cloth edge.
E. Regardless of the warp or latitudinal direction, no matter what kind of defect, the principle is to see, and correct points will be given according to the defect score.
F. Except for special regulations (such as coated tape), it is usually only necessary to inspect the front of the grey cloth.
1. Sampling procedure
1) AATCC inspection and sampling standards:
A. Number of samples: The square root of the total number of codes multiplied by eight.
B. Number of sampling boxes: the square root of the total number of boxes.
2) Sampling requirements:
The selection of the examination papers is completely random.
The textile mill needs to present the cargo packing list to the inspector when at least 80% of the rolls in a batch of cloth have been packed. The inspector will select the test papers from them.
Once the inspector has selected the papers to be inspected, no adjustments can be made to the number of papers to be inspected or the number of papers that have been selected for inspection. During the inspection, no yardage of cloth shall be intercepted from any roll except for recording and checking the color.
All rolls under inspection are graded and defect scores are assessed.
2. Inspection score
1) Calculation of score
In principle, after each roll of cloth is inspected, the obtained points can be added up. Then the rating is based on the acceptance level, but because different cloth seals must have different acceptance levels, if the following formula is used to calculate the score of each roll of cloth per 100 square yards, only the 100 square yard The specified score below can be used to grade different cloth seals.
A = (Total Score x 3600) / (Number of Codes Checked x Cuttable Fabric Width) = Score per 100 square yards
2) Acceptance level of different cloth types
Different types of cloth are divided into the following four categories:
A single roll of cloth that exceeds the specified score shall be classified as second-class. If the average score of the entire batch of cloth exceeds the specified score level, the batch of cloth shall be deemed to have failed the test.
3. Inspection score: other considerations for assessing cloth grade
1) Any repeated or repeated defects will constitute repeated defects. Repeated defects for every yard of cloth must be awarded four points.
2) Regardless of the defect score, any roll with more than ten yards of cloth containing repeated defects should be deemed unqualified.
Full width defect:
3) Volumes containing more than four full-width defects per 100y2 shall not be rated as first-class products.
4) On average, the volume containing more than one major defect per 10 straight yards will be determined as unqualified, no matter how many defects are contained within 100y.
5). A roll containing a major defect in the cloth head or cloth tail 3y shall be assessed as unqualified. Major defects will be considered as three- or four-point defects.
6) If the cloth has obvious loose or tight threads on a selvedge, or there are ripples, wrinkles, creases or creases on the cloth main body, these conditions cause the cloth to be uneven when the cloth is unfolded in a general way. Such rolls cannot be rated as first-class.
7) When inspecting a roll of cloth, check its width at least three times at the beginning, middle, and end. If the width of a roll of cloth is close to the specified minimum width or the width of the cloth is not uniform, then the number of checks on the width of the roll should be increased.
8) If the roll width is less than the specified minimum purchase width, the roll will be determined as unqualified.
9) For woven fabrics, if the width is 1 inch wider than the specified purchase width, the roll will be determined as unqualified. However, an elastic woven fabric can be determined as acceptable even if it is 2 inches wider than the specified width. For knitted fabrics, if the width is 2 inches wider than the specified purchase width, the roll will be deemed unacceptable. However, for a stretch knitted fabric, even if it is 3 inches wider than the specified width, it can be determined as acceptable.
10) The overall width of the cloth refers to the distance from the outer weaving edge at one end to the outer weaving edge at the other end.
Cuttable cloth width refers to the width measured by removing the cloth weaving edge and / or the pinhole of the setting machine, the unprinted, uncoated or other untreated surface part of the cloth body.
Color difference evaluation:
11) The color difference between rolls and rolls, batches and batches must not be lower than four levels in the AATCC gray scale.
12) In the process of fabric inspection, take 6 ~ 10 inch wide color difference cloth boards from each roll. The inspector will use these cloth covers to compare the color difference in the same roll or the color difference between different rolls.
13). The color difference between edge-to-edge, edge-to-center, or cloth head to cloth end of the same roll must not be lower than four levels in the AATCC gray scale table. For inspected rolls, each yard of cloth with such color defects will be rated as four points.
14) If the fabric under inspection does not match the approved sample provided in advance, the color difference must be lower than 4-5 grade in the gray scale table, otherwise this batch of goods will be determined as unqualified.
15). If the actual length of a single roll deviates by more than 2% from the length indicated on the label, the roll will be determined as unqualified. Defect scores are no longer assessed for rolls with deviations in roll length, but must be noted on the inspection report.
16). If the sum of the lengths of all the spot-checked samples deviates by 1% or more from the length indicated on the label, the whole batch will be determined as unqualified.
17) For woven fabrics, the entire roll of fabric can be connected by multiple parts. Unless otherwise specified in the purchase contract, if a roll of fabric contains a joint with a length less than 40y, the roll will be determined. Failed.
For knitted fabrics, the entire roll of fabric can be made up of multiple parts. Unless otherwise specified in the purchase contract, if a roll of fabric contains a joint that weighs less than 30 pounds, the roll will be considered unqualified .
18) For woven and knitted fabrics, all printed or striped fabrics with greater than 2% bow weft and skewed folds; and all wicked fabrics with greater than 3% skewed rolls cannot be classified as first-class.
19) For woven fabrics, all printed and striped fabrics with a skew greater than 2% and rolls of all wicks with a skew greater than 3% cannot be classified as first-class products.
For knitted fabrics, all wick fabrics and printed fabrics that are skewed by more than 5% cannot be classified as first-class products.
21) 、 All the odorous rolls can not pass the inspection.
22) Through the defects that cause the cloth to be damaged, regardless of the size of the damage, it should be rated as 4 points. An eyelet should include two or more broken yarns.
23) Check the feel of the cloth by comparing it with a reference sample. If there is a significant difference, the cloth will be rated as second-class, with 4 points per yard. If the feel of all the rolls does not reach the level of the reference sample, the inspection will be suspended and the score will not be assessed for the time being.
24). In the full inspection, at least two inspections are allowed, ± 5% is allowed, otherwise it is determined as unqualified (although it is not applicable to the 4-point standard, but it must be recorded).
25). During the full inspection, check at least two places (with temperature and humidity requirements), allow ± 5%, otherwise it will be rated as a non-conforming product (although it is not applicable to the four-point standard, but to be recorded).
4. Reel and packaging requirements
1) No special requirements, about 100 yards in length and no more than 150 pounds.
2), no special requirements, should be rolled, so that the paper tube can not be damaged during transportation.
3). The diameter of paper tube is 1.5 "-2.0".
4). The ends of the cloth shall not exceed 1 ”.
5) Before the cloth is rolled up, fix it at the left, middle, and right positions with adhesive tape less than 4 "long.
6) After the roll, in order to prevent the cloth roll from loosening, apply 12 "adhesive tape to fix 4 places.
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