What is the effect of adjusting the heald frame of an air jet loom on weaving
2023-09-04
chinaredflag
1. What effect does the height of the heald frame have on weaving
① When it is too high, it can cause weft filling at the upper part of the air guide part of the reed or even the upper jaw, causing cracks and holes in the fabric surface;
② When it is too low, the upper warp yarn will relax, causing unclear opening and shorter opening angle, which may cause an increase in weft stop.
The setting of the height of the heald frame should, in principle, ensure that the weaving mouth is in the air guide part of the steel reed to avoid causing holes in the fabric surface. The setting of the height of the heald frame includes clear weaving mouth, semi clear weaving mouth, and unclear weaving mouth, which should be selected based on the warp density of the fabric. High density fabrics and fabrics with poor hairiness generally use semi clear weaving mouth or unclear weaving mouth to make the warp yarn more layered and reduce warp yarn adhesion; For fabrics with twill and complex weave, there is a distinction between the front and back positions of the edge yarn heald frame and the ground weave heald frame. The setting should pay attention to the height of the heald frame to avoid excessive looseness of the edge yarn and reduce weft stop.
3. The influence of heald frame on weaving mouth
The heald frame is slightly higher from front to back, so that the upper warp yarns are all in the same layer, forming a clear weave.
The height of the heald frame is consistent, causing the upper warp yarn to be slightly staggered, resulting in a semi clear weave.
The heald frame is lowered sequentially from front to back, and the upper warp yarns are completely staggered, resulting in an unclear weave.
