The production principle of jacquard knitted fabric

The jacquard principle of jacquard, there are two differences in the production of jacquard fabrics and small jacquard fabrics. One is that the jacquard does not use a brown frame, but uses a more complicated combination of faucet + harness + mesh board + brown silk; Jacquard pattern curtains are generally very long. If there are N wefts in a jacquard back position, N pattern boards must be equipped. There must be a special bracket for hanging the pattern board curtains. There is a particular need to wear the pattern board. Which pattern board If the front and back sides are wrong or the left and right sides are adjusted, the pattern will be woven in the wrong shape. It is also very troublesome to find the wrong pattern board. The bracket of the hanging pattern curtain is usually arranged on the top of the loom together with the jacquard faucet. A small jacquard pattern board generally has up to 24 pits, which are used to control the lifting and weft selection of the brown frame. A large jacquard pattern board has thousands of pits, which correspond to the number of stitches of the jacquard machine faucet. The hole position is aligned with a pattern needle, and whether the hole position is perforated is used to control whether the brown is lifted. A pattern hole controls the movement of several warp yarns. These warp yarns are one or several of each flower in the open cloth surface. The principle is that warp yarns with the same trajectory can be hung on a dragon hook through their respective harnesses. If the number of roots exceeds the load-bearing capacity of the dragon hook, you can consider several more hooks to share it. In many cases, one hook The number of harnesses hung on is the number of flowers in the whole cloth. Their information transmission process is the pattern board-pattern needle-dragon hook-through wire-heddle-warp yarn.

The advanced computerized jacquard faucet jacquard machine can save the trouble of making pattern boards and arranging a pile of pattern boards to run. At the same time, the time from design to start-up is greatly shortened, and it is easy to modify, and the efficiency is greatly improved, but the equipment investment is much higher, often ten times or more than that of ordinary machines.

Jacquard fabrics are the same as general fabrics, only limited yarn count and density can be made, and not all fancy patterns can be lifted. Because it is jacquard, the warp yarns have many different weaving structures and may have different weaving tightness. , So that the warp tension unevenness occurs during the weaving process. If the tension unevenness is slight, it can be produced, and the cloth surface has some unevenness, or it is easy to have star jumps. If it is serious, it is impossible to weave, or the weaving efficiency is very low, and there are many defects. This requires full consideration of the feasibility of production when designing the jacquard process, which mainly depends on the organization of its flower and ground, the size of the jacquard part, and whether the flowers are evenly distributed on the cloth surface. The craftsman of the factory will estimate the production difficulty of a variety based on these factors, for reference by the business department when quoting and receiving orders. When encountering a variety that is too difficult to produce, the factory will often give up. The more common jacquard method is to make the positive and negative organization of flower and ground separately, or similar organization, such as direct tribute ground Henggong flower, 3/1 ground 1/3 flower, 3/1 ground 2/2 flower, 2/1 ground 1 /2 Flower, or exchange of flowers and ground organization. When the tightness of the structure of the flower and the ground is not the same, such as the jacquard fabric of the plain weave, the line-shaped pattern is best, and it is evenly distributed on the cloth surface. Try to make the number of interweaving points experienced by each warp the same or similar. If this is not possible, consider double warp beams or three warp beams, arrange warp yarns with similar tension on the same warp beam, and draw warp yarns of different lengths respectively.