How much do you know about air-jet looms? (1)

There are many classifications of looms. According to the weaving method of weft insertion, they can be divided into shuttle looms and shuttleless looms.
The weft insertion of a shuttle loom is a loom that uses traditional wooden shuttles or plastic shuttles for weft insertion. Due to the large size and heavy weight of the shuttle, the shuttle is repeatedly projected back and forth, which causes the machine to vibrate, noise, energy consumption, vehicle speed is slow, and efficiency is low.
There are also various weft insertion methods for shuttleless looms, such as rapier, air jet, water jet, projectile and multi-shed (multiphase).
Today we will talk about the air jet loom in the shuttleless loom
Air jet loom
The air-jet loom is a new type of loom that uses the high-speed airflow generated by the release of compressed air to draw the weft through the weaving opening to complete the weft insertion. It is currently the fastest growing type of shuttleless loom.
1. Historical development
1949
Czechoslovakia first made an air-jet loom, and the woven fabric was only 45cm wide due to the lack of control measures for the diffusion of airflow.
1956
The combined piping sheet was developed to limit the diffusion of airflow, which made a breakthrough in jet technology.
1963
The Netherlands has developed auxiliary nozzle weft insertion technology, which greatly increases the width and speed of the loom.
1970s
The advent of a new form of restricting air diffusion-shaped buckles, is a new development in the range and quality of fabrics woven by air-jet looms.
recent years
The new development trend of air-jet looms is energy saving, intelligence, networking, expansion of variety adaptability, high speed and low vibration, etc.
2. The principle of weft insertion
Air jet weft insertion is to use air as the weft insertion medium to draw the weft yarn with the compressed air jets to generate frictional traction, take the weft yarn through the shed, and achieve the purpose of weft insertion through the jet generated by the air jet.
Features of jet weft insertion
The characteristics of air-jet weft insertion are high speed, large tension, small shed, and high requirements for raw yarn and semi-finished products.
Air-jet weft insertion is a passive weft insertion method. The tension of the weft yarn is small when flying over the shed, and there is no control. Therefore, it lacks sufficient traction for the weft yarns with high linear density or fancy yarns. At the same time, the warp yarn shedding state has a great influence on the quality of weft insertion, and it is easy to produce fabric defects such as weft shrinkage and weft return.
3. Main structure and characteristics
The air-jet loom is mainly composed of frame, transmission and braking system, shedding mechanism, weft insertion mechanism, beating-up mechanism, warp let-off mechanism, winding mechanism, selvedge mechanism, scissors mechanism, edge catching device, centralized oil supply and automatic Control system and other components.