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Inspection Method of Weft And Slope of Denim Fabric

May. 20, 2020

Manufacturers of denim clothing often encounter the weft and slant phenomenon of the fabric. If the corresponding measures are not taken during the production of the garment, the size of the garment is very unstable. Especially after washing, the deformation and distortion will be more prominent, often expressed as " "Twist" seriously affects the appearance and performance of ready-made garments.

China denim fabric supplier believes that the phenomenon of distortion of garments after washing is because the latent stress of the warp and weft yarns before the garment is not removed enough, the angle of interweaving of the warp and weft yarns before washing is greatly changed, and the deformation exceeds the fabric. The range that the elasticity can bear will inevitably cause the distortion of the garment.

Under normal circumstances, the rate of change is controlled within 2% before and after washing, no obvious distortion will occur after the garment is made, and a change rate of more than 3% will produce a significant distortion. The change rate of trousers should be controlled as small as possible. The change rate of trousers should be controlled as small as possible. The longer the material, the smaller the change rate.

Finished Fabric

Finished Fabric

The correct standard for testing whether a finished fabric will cause distortion is not the so-called pull slope or slope, but the rate of change before and after laundering.

The correct inspection method is: in general, take the left, middle and right measurement points on the cloth surface in the direction of the weft yarn. The left and right points can be determined on the left and right sides of the cloth. If the highest point of the latitude arc deviates too far to a certain side, it is better to add a measuring point. When calculating the rate of change, the most accurate data is obtained when the midpoint or the highest point of the latitude arc is used as the measurement reference point.

In short, the maximum rate of change tested with each test point as the reference point is the most accurate data to measure whether the fabric is distorted. The traditional edge-to-edge two test points can only test the correct data when there is no latitude arc. Once the latitude arc appears on the cloth surface, the test results lose their accuracy and reference value.

The test method of weft slope in fabric testing: draw a line perpendicular to the fabric edge, take one end of this line as the starting point, and then draw a line according to the fabric weft pattern. There is a certain distance, assuming this distance is L.

There are 3 ways to express latitude and slant:

Angle: the size of the angle formed by 2 lines;

Length: the length of L;

Percentage: The length of L divided by the width of the fabric.

Factors affecting the rate of change of clothing:

During the weaving process, the warp and weft yarns are interlaced in the vertical direction, but the cloth weft yarns and warp yarns after getting off the machine are in the form of a parabolic shape with a certain inclination angle. Therefore, the weft yarn has two changes after the machine is unloaded: one is that the angle between the weft yarn and the warp yarn is changed from 90 degrees to an angle less than 90 degrees, which is the so-called weft slant phenomenon; the second is that the weft yarn is straight during the change process The stress in the direction is not consistent, often the middle and the two sides are small, so the entire weft yarn presents an inclined arc, which is the so-called weft arc phenomenon.

It is precisely because of the combined effect of the two factors of weft and weft that caused the distortion of the garment, and the weft phenomenon is more serious and more common than the weft arc phenomenon. The emphasis on latitude and slant in China is much higher than that on the latitude arc. The reason for the distortion of garments is that the problem of the latitude arc is much higher than the problem of the weft slope, which is mainly caused by the lack of attention to the latitude arc in actual production.


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