ODMN - Optimized Design for weaving machine Main Nozzles (2013 - 2016)

The project deals with the optimized design for weaving machine main nozzles.

In air-jet looms, the weft thread is brought from one side to the other side (=insertion) by accelerating the yarn in the main nozzles by means of compressed air. For an optimum insertion, the main nozzle should have the following properties:

  1. A sufficient performance is of primary importance: it means that the main nozzle should be able to obtain a high thread speed.
  2. The thread speed and traction should be realized without thread damage, which can occur in multiple forms and strongly depends on the yarn type. Thread damage may not occur in any phase, neither in the transient phase, not during insertion at constant speed, nor in the pressure run-down phase at the end of the insertion.
  3. When waiting for a next insertion, the weft thread should be able to rest in the main nozzle without being damaged. Generally, the thread is kept in the main nozzle at a low air current.
  4. When the machine is at rest, the weaver should be able to apply the weft thread in the main nozzle in a simple way before the weaving process is started. This is also done by means of a low air current resulting in a slight effect of suction at the main nozzle entrance. This property is called  “threadability”.

In order to realize these properties, the project wants to simulate through CFD the air current in the main nozzle duct. Through thread simuation by means of the air current profile, it should be possible to simulate and analyse the thread behaviour. Testing positions will further measure air currents in order to validate the CFD simulations and will determine air friction coefficients for thread simulations. The aim is to obtain a new, practically producable main nozzle design by means of an automized optimisation procedure which meets the qualities described above.
Our department is mainly involved in thread simulations.

Supported by: IWT
Duration: 2013 - 2016
Contact: Prof. Dr. ir. Lieva Van Langenhove