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Inspection Method for Weft Skew of Denim Fabric

Sep. 12, 2020

Authentic denim fabric supplier shares this article for you.

Denim clothing manufacturers often encounter the phenomenon of weft skew of the fabric. If no corresponding measures are taken during the production of the garment, the size of the garment will be very unstable, especially after washing, the deformation and aliasing will be more prominent, often expressed as " "Twisting" seriously affects the appearance and performance of the garment.

To put it simply, the phenomenon of distortion after washing the clothes is because the potential stress of the warp and weft yarns of Broken Twill Denim Fabric before the clothes is not relieved enough. The angle of the warp and weft yarns before washing changes greatly, 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 change rate before and after washing is controlled within 2%, and there will be no obvious distortion after the garment is finished, and the change rate of more than 3% will produce obvious distortion. The change rate of trousers material than clothing material should be controlled as small as possible, and the change rate of trousers material should be controlled as small as possible than that of shorts. The longer the material, the smaller the rate of change.

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

The correct inspection method is: Generally, take the left, middle and right three measuring points along the weft direction on the cloth surface, and the left and right two points can be determined on the left and right sides of the cloth respectively. If the highest point of the arc of latitude is too far to one side, it is better to add a measuring point. When calculating the rate of change, the data obtained is the most accurate when the middle or the highest point of the arc of latitude 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 twisted. 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 accuracy and reference value.

Broken Twill Denim Fabric

Broken Twill Denim Fabric

The test method of the weft skew in the fabric test: draw a line perpendicular to the edge of the fabric, take one end of this line as the starting point, and then draw a line according to the weft pattern of the fabric. These two lines will be between the ends of the other side of the fabric. There is a certain distance, suppose this distance is L.

There are 3 ways to express weft skew:

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 garments:

In the weaving process, the warp and weft yarns are interlaced in the vertical direction, but the weft and warp yarns on the cloth surface after the machine are off are in the form of a parabolic shape with a certain inclined angle. Therefore, the weft yarn undergoes two changes after the machine is off: one is that the angle between the weft and the warp changes from 90 degrees to an angle less than 90 degrees, which is the so-called weft skew phenomenon; the other is the straight line of the weft during the change process. The stress in the direction is not consistent, and it is often larger in the middle and smaller on the two sides. Therefore, the entire weft yarn presents an inclined arc, which is the so-called weft arc phenomenon.

It is the combination of weft skew and weft arc that causes the distortion of the garment. The woof skew phenomenon is more serious and common than the weft arc phenomenon. The phenomenon of weft skew during the production process is also more intuitive, so the actual production The emphasis on the latitude oblique is much higher than that on the arc of latitude.

The reason for the distortion of the garment is that the problem of the weft arc is much higher than the problem of the weft skew. This is mainly caused by the lack of attention to the weft arc in actual production.

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