1.Why is there a concave diagonal fold on the front of the mesh? Does the direction of the fold run opposite to the mesh pattern?
When a right slanting net loses tension during carding, it will naturally tilt and the lower left corner of the net will have excess length. The excess length will cause the left side of the net to bounce back and contract as it rolls onto the net roller. When the tension of the net becomes negative, the surface net and second layer net rolled onto the net roller will become loose and separated, creating a gap between the net and net roller.
After carding, when the steel box leaves the weaving mouth, the net surface, under the tension of the warp threads, moves from its tilted position without tension to a normal position, causing the upper left corner of the net surface to produce greater tension. At the location of the net surface with greater tension, the gap in the second layer of net rolled onto the net roller is partially tightened, and the net surface will form a slanted groove with a direction opposite to that of the right slanting net.
2.Why is the spacing period length of the blind crease approximately 600mm?
The circumference of the roller of the mesh is 600mm. When the tension of the mesh is inconsistent, periodic inconsistencies also occur on the locally relaxed surface of the mesh. This locally relaxed surface also undergoes periodic changes in length along the circumference of the roller.
3. Why does changing the loom prevent diagonal print defects when using the same warp thread?
The process parameters of the loom play a role in the formation of diagonal print defects, and the flexibility of the warp tension rotation on different looms is also different.
4. Does changing the speed of the loom have any effect on diagonal print defects?
It has minimal impact.
5. What are the conditions that can lead to the formation of dark diagonal print defects in a twill weave?
Dark diagonal print defects may occur during the twill weave process when the following conditions exist simultaneously:
1. The tension on the surface of the fabric is inconsistent, with a maximum warp tension of at least 0.6p during warp sizing.
2. The surface of the fabric experiences local relaxation or vibration during warp sizing, resulting in zero or negative tension in certain areas of the fabric.
6. Why do diagonal lines often appear on the surface of the net after it reaches a length of 20m?
In square mesh nets woven under inconsistent tension, the thickness of each part of the net is also inconsistent. Parts with lower tension have a thicker net, and the difference in thickness between the various parts of the net on the net roller increases the more it is rolled. This exacerbates the inconsistency of the net tension, making it more likely to form diagonal lines. In summary, the significant differences in the mechanical properties of the warp threads are the key factor in the appearance of diagonal lines on the net.
1. The significant differences in the tensile strength p value of the warp threads are caused by fluctuations in their diameter size and yield strength ∂ value.
2. The significant differences in the yield strength ∂ value of the warp threads are caused by the instability of annealing processes and drawing processes, as well as differences in the chemical composition and smelting quality of the metal material.
3. The significant differences in the elastic strain ∈ value of the warp threads are caused by the instability of annealing processes and fluctuations in local chemical composition.
7. Does the pressure of the compression roller affect the dark oblique crease imprinting?
Increasing the pressure of the compression roller can help overcome dark oblique creases. Tightening the mesh of the square hole net on the roller can make the thickness of the net on the roller more uniform, and also reduce the chance of the second layer of metal mesh forming loose loops during the weft insertion moment. However, it is important to note that the pressure of the compression roller must be evenly applied to the entire width of the metal mesh.
