Key points of textile fabric inspection
2022-11-11
A. Fabric inspection process:
including inspection cut piece, checking color and light, checking the total quantity of mass production, sampling of fabric rolls, retaining various colors, and filling in inspection report.
B. Operation key points of each process:
Check the cut piece:
1. Provide a clean and tidy inspection area with good lighting conditions.
2. The factory provides the mass production code sheet and the real cut piece of each roll, and divides it into different fading colors according to different colors of light.
3. Check whether the number of cut pieces is consistent with the number of volumes shown on the code sheet.
4. Check the color and light difference between each fading color and the same fading color, and make appropriate adjustments. Those who do not meet the standards will reject this volume.
5. Check the left, middle and right color difference of each cut piece and cut piece defects. Reject the volume if it does not meet the standard or specify the volume to be called out for inspection.
Check the color and light: select the representative cut piece of each fading color, check the color and feel under the standard light box and the specified light source, print/yarn-dyed jacquard fabric in addition to the color and check the pattern/cycle size/overall style, reject those that do not meet the standard.
Check the total quantity: Led by factory staff to the warehouse, check the outer packing and stacking of mass production, and check the total volume.
Sampling and inspection of cloth roll:
1. The factory shall provide a code inspection machine with good operation and staff to assist in the inspection of the extracted cloth rolls.
2. Randomly select the cloth rolls to be inspected, and the cloth rolls should include all fading colors. At least 10% of each fading color should be randomly checked. If there is a high rate of disputed or unacceptable defects, the proportion of inspection should be increased.
3. Check whether the outer packing of the cloth roll meets the requirements and whether the shipping mark is correct and complete.
4. Check the fabric defects on the code inspection machine and score with a four-point scale.
5. The effective width of the cloth head/middle/tail shall be randomly measured and recorded, and checked with relevant PDM. If the actual width exceeds the tolerance range, the whole batch of fabrics shall be stretched, fixed and repaired.
6. cut piece at the end of each volume and check whether the color light at the end is the same as well as the color difference between left, middle and right. Compare this cut piece with the corresponding cut piece left by the factory to check whether the cut piece is real. Then send the cut piece to the experiment to measure the gram weight.
Sampling test: When inspecting cloth surface, random sampling of mass production samples, after signing, will be sent to the designated testing institution for internal index test.
Keep each color sample and test report: Provide each color sample, which should be representative, on A4 paper, and label the bill number, product name, date and each color name. The supplier keeps internal laboratory test reports for all production batches for subsequent review.
Fill in the inspection report: fill in the inspection report truthfully according to the above inspection conditions.
C. Fabric inspection guidelines:
Color and light control:
1. The inspector shall cut the cloth sample of the whole width at the distance of 10cm from the head end of each roll (usually called the head cloth), and evaluate the color difference from edge to edge and from edge to center.
2. In the inspection process, the inspector shall check the color light deviation from edge to edge, edge to center, head and tail, and the color light deviation must be within the AATCC gray grading card 4.5.
3. During the inspection, the inspector shall check the color and light deviation between volumes in each dyeing lot and between each dyeing lot (cylinder to cylinder). mass production is required to be divided into different fading colors according to color light, and the following requirements should be met:
a. The color difference between each fading color is within level 4.
b. The color difference of each cut piece between the same setting is within 4.5 levels.
c. The color difference between the intra-segment and inter-segment of the spliced volume is allowed to be within class 4.5.
Four-point scale evaluation criteria:
1. In the process of fabric inspection, evaluate all defects according to the following four-point scale:
The evaluation of the defects in 0-3 "is 1 point. The evaluation of the defects in 3-6" is 2 points. The evaluation of the defects in 6-9 "is 3 points
2. A defect within a yard, no matter how large or small, is punishable by up to 4 points.
3. All holes, no matter how big or small, are penalized 4 points.
4. A seam is four points.
Calculation of cloth fraction: Based on the above score, the fraction per 100 square yards of single volume and whole lot can be calculated using the following formula.
Acceptance Criteria:
1. Determine whether each roll of fabric and mass production is acceptable according to the score of fabric surface inspection, taking into consideration the following three aspects: the score of 100 square yards per roll of fabric shall not exceed 15 points; The score of 100 square yards of mass production shall not exceed 13 points; The number of defects in a cloth should not exceed 8 per 100 square yards.
2. The length of each piece of cloth in a roll shall not be less than 40 yards or as stipulated in PDM.
Other requirements for fabric defects:
1. Fabric defects affecting the appearance and performance of clothing are unacceptable. For obvious defects, the edges of the fabric must be marked with plastic pins or colored thread in the same place.
2. Unless the fabric is required to have the fabric style, thick section and detail yarn is not acceptable.
3. Repeated or continuous defects are regarded as continuous defects. If continuous defects occur, the length of the defect is between 1y and 3y, and the number of the defect codes should be larger than the length of the defect. If the length exceeds 3y, it must be cut.
4. Do not allow 4 minutes of defect within 3y of seam or fabric head.
5. Holes larger than 0.5cm in diameter must be cut.
Other requirements for fabric appearance:
1. It is unacceptable for every roll of fabric/shipment to have an unpleasant odor.
2. The usable front of the fabric shall be placed on the inside of each roll and clearly marked on each roll. 6.3 The roll will not be considered first class where the appearance of significant looseness or tightness along one or both sides of the fabric would make it difficult to pave conventional lay-out.
3. The weight of fabric must be randomly checked at least once during inspection. The weight must be within the tolerance of PDM.
4. Weft slant/arc is not allowed to exceed 3% of fabric width.
5. The length marked on each volume must be checked against the actual length. The difference between the actual code length and the marked code length cannot exceed 0.5% (in principle, the actual code length cannot be smaller than the marked code length). Any significant discrepancy will cause the volume to be rejected.
6. Code length of each volume refer to the specific requirements of the PDM. Only one segment of each volume is allowed to be spliced. The length of the segment shall not be less than 40 yards.
7. The feel of the fabric must be consistent with the confirmed feel standard sample.
Rejection of goods:
1. Any roll that does not conform to the above requirements will be rejected.
2.mass production has serious missed inspection, the missed inspection rate is 10%, and all goods are rejected.
3. If the inspection defects exist in large quantities, all the goods will be rejected regardless of the inspection rate.