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The OLM2NYQ monitors: Node Count / Node Space & Yarn Quality 'online'

The system uses a dual axis infra red sensor to measure the profile of the yarn. The two infra red beams eliminate the need for presentation of the yarn and eliminate the need for yarn contact in the sensing area. The sensors optical system is self-checking and will show an alarm if the optics become contaminated (dirty). All sensors connect to signal processing units (SPU's). These units condition the sensor signals and provide a number of ways in which the sensor data can be accessed. Each SPU will handle up to 8 sensors and the number of units required, per machine or group, will be the machines total number of positions divide by 8. (There are '4' sensor SPU's available.)


The OLM2NYQ is a Yarn Quality Monitor that is capable of measuring the On-Line quality of yarn during production. The OLM2NYQ monitors for changes in the following characteristics of the yarn:

  • Node Count
  • Tension Change (Introduced by friction on discs & guides)
  • Denier (Average yarn size)
  • Spin Finish (Increase or decrease)
The Node Count and Nodes/Metre are shown as an absolute count, the Node Spacing is shown as an absolute value in mm, calculated from the time between Nodes & machine speed.

Tension, Denier & Spin Finish are all shown in a Yarn Quality Index, where a number represents the index. The number representing the Yarn Quality will change if there is any change in the Tension, Denier or Spin Finish of the yarn being monitored.

The OLM2NYQ will monitor changes in the yarn quality during production and will highlight problem thread lines. The efficiency and correct function of the air jet will be monitored in both the Node Count and the Yarn Quality Index. Tension, Denier (average yarn size) and Spin Finish will be monitored with the Yarn Quality Index, all characteristics are monitored at the same time and a change in any will change the displayed and recorded values.

The effects on the Yarn Quality Index caused by a change in any of the monitored characteristics are as follows:

Node Count: - A decrease in node count causes a decrease in the Yarn Quality Index.

Tension: - An increase in yarn tension will cause a decrease in the Yarn Quality Index and a decrease in tension will cause an increase in the Yarn Quality Index.

Denier: - An increase in Denier (average yarn size) will cause an increase in the Yarn Quality Index and a decrease in denier will cause a decrease in the Yarn Quality Index.

Spin Finish: - A reduction in spin finish will cause a decrease in the Yarn Quality Index and an increase in Spin Finish will cause an increase in the Yarn Quality Index.

The Yarn Quality Index is used because to separate the effects of changes in Tension, Denier and Spin Finish on the yarn during production is not possible due to there being too many variables having an effect on the absolute denier of the yarn. What the OLM2NYQ is capable of doing is to monitor all the variables at the same time and to warn of Quality Problems during production thus reducing the costs of wasted production and improving overall quality of produced yarn.


Example Yarn Profiles Monitored by the OLM2NYQ
Yarn Node / Node Spacing & Yarn Quality Node / Node Spacing, Ply Drop Out & Yarn Quality