The cloth edge plays an extremely important role throughout the grey fabric production process. In the weaving process, the cloth edge must firmly hold both ends of the weft yarns, and withstand the strength of the temples, so that the fabric surface will not produce too much weft shrinkage, reduce warping of the edge yarns, and improve the friction degree of the warp yarns and dents on the edges. The warp breaking rate of the edge part increases the strength of the edge part, maintains the flatness of the cloth surface, the width is uniform, and is easy to wind and form well, which facilitates the processing of the subsequent process.
In the process of dyeing and finishing, the cloth edge is also subjected to the tensile force of the fabric or needle punch, especially the cellulose fiber fabrics such as cotton and hemp, in the stereotyped tentering process after mercerizing, it needs to withstand a great pulling force. Therefore, a firm, smooth, elastic and appropriate side organization is a necessary condition for finishing. The unreasonable design of the fabric will cause the fabrics to be loosened, broken, tight, curled, etc., and a large number of edge breakages will occur. Even the post-finishing process will not be able to proceed, causing huge losses.
In a shuttle weaving machine, the weft yarns are formed on the two sides alternately weftwise by the shuttle to form light edges; on rapier weaving machines and air jet weaving machines, the weft yarns are unwound at high speed by the bobbin, and the weft yarns are unidirectionally weft-inserted. Both sides of the weft yarns are free ends. Flash formation. In the middle of the fabric, the weft yarns have a relatively large and uniform degree of flexion, and the two sides of the fabric are free ends, which are mainly held by the selvage and false edges. If the design is not reasonable, the tension of the weft yarns at the edges will be better than that of the fabrics. The weft yarn tension is much smaller, and the weft yarn is loose, which will cause the weft shrinkage. The warp yarn weaving rate at the edge of the warp yarn and the cloth body will differ greatly, which will bring hidden trouble to the subsequent process.
Twill and wrought lining are generally used to borrow the edge, that is, a single piece and a ground weave. The pattern board must be reversed. For example, the 4/1 side is matched with the ground organization 1/4, the organization point is opposite, the jacquard organization, the joint organization, etc. are customarily used. Repinning, Fang Ping doing the edge, considering from the following four aspects:
The edge organization is too narrow and strong enough to withstand the pulling force and it is easy to tear the edges and do not provide protection. Too wide, increasing the cost of the fabric, affecting the fabric's cuttable area under certain width conditions. In general, simple fabrics can be as small as a small width, but the lengths of fabrics on the same side, on the other side, and on stretch fabrics with long floats are appropriately increased.
The edge thickness should be consistent with the cloth body, so that it is easy to maintain the fabric flat, winding, beautiful, uniform force.
The cloth is usually slightly tighter than the cloth, but it must not be too tight. Too tight will affect the finishing process, because the cloth will not be able to withstand a large deformation in a short period of time. It will even tear the cloth edge and make the entire cloth obsolete. Too loose can not work, on the one hand will form a weft, forming a lotus leaf edge, easy to break in the finishing. Therefore, the density of the edge tissue is greater than that of the ground.
4) Wearing and wearing
The number of edges to be used should be as small as possible. It is better to organize the heald frame to make edges. Usually, up to two pages of heald are added, otherwise the weaving difficulty and cost are increased. The overall structure of the hemming and weaving is mainly based on the organizational structure of the edge and it The required role is designed to meet the requirements and functions of the edge, and the number of wearable edges of the organization is usually not less than the number of wearable tissues. It is best to place the first two pages of the brocade with more than 8 pages of the brocade, ensuring that the edges of the rim are clear and reduce the number of latitude stops.
Do 4/1 stretch fabric, if you use a dobby, it is recommended to use 2/2 square, the most stable, with a bicycle recommended 2/3+3/2 single wear, compared to 1/4+4/1 easy roll Edges can also be added to the "2/3+3/2" edges to help overcome curling caused by the large differences between the latitude and longitude points on both sides.
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