Optical precision

Yarn buyers such as weaving mills heavily depend on the performance of the yarn during production. As only smoothly running looms achieve high production efficiency, any deviation in the yarn quality can lead to an increased number of thread breaks and thus to undesired machine stops. Such incidents have a huge impact on the efficiency and profitability of the weaving mill and are immediately reported to the yarn suppliers, the spinning mills.

A large number of factors influence yarn quality, starting with the raw material, the various process steps and as well as the maintenance and cleaning intervals of machines and components. In addition, there are also short-term influences, such as the climate. In countries with extended periods of rain (monsoon), a significant increase in humidity in the spinning room can occur frequently and spontaneously. Since most winding workshops are not air-conditioned, this change in ambient conditions can lead to a very fast and extreme increase in the cutting rate at the winding stage, which is often compensated by loosening the yarn clearer settings. As the humidity slowly returns to normal, many objectionable yarn faults will pass the yarn clearer and eventually end up in the package before the settings are corrected again. This leads to an inferior, substandard yarn quality, which in due course gives reason for complaints from the weaving mills.

2. Loepfe solution

Yarn clearers are an important and integral part of automatic winding machines. While an increasing moisture content in the yarn leads to a changed assessment of the mass, it does not explicitly lead to a change of the holistic yarn profile. Optical sensors used for yarn quality control remain unaffected by suddenly changing ambient conditions and ensure precise and constant measurement at all times. With Loepfe YarnMaster yarn clearers, spinning mills that work and are exposed to such suddenly changing environmental conditions can rely on unvarying monitoring of the yarn quality and do not have to worry about possible complaints.

3. Resulting benefits

Loepfe’s YarnMaster yarn clearers, no matter whether in winding or in rotor spinning, make no compromises when it comes to yarn quality control, ensuring consistent winding efficiency irrespective of changing ambient conditions!

Furthermore, spinners are free to produce different yarns with different requirements, e.g. compact or core yarns that require wet-splicing to achieve adequate tensile strength. The water spray applied during splicing has an effect similar to the increasing humidity caused by heavy rain and can likewise influence the mass of the splice.
Loepfe’s well proven technology confidently and reliably masters these challenges and gives spinners a reassuring peace of mind – saving efforts and manpower – and ultimately helps maintaining overall production efficiency and profitability of the spinning mill.