CORRECT MAINTENANCE PLANNING
With its “Lab Trend”, MillMaster TOP offers a comprehensive analysis tool for determining fluctuating yarn properties and their causes. Deviations in the yarn quality produced may result from the following factors:
- Raw material change
- Settings changes
- Wear and tear
- Climate change
Here is an example of how spinning mills can use the “Lab Trend” analysis to determine whether their maintenance intervals are correctly scheduled and executed.
The trend shows several increases of events in the classes D1 and F. You can see how the number of errors increases several times, up to 39 events. It is also interesting that these peaks recur at regular intervals of time.
Solutions & benefits
Now it is important to find out what caused this regular pattern and initiate countermeasures. The information provided by “Lab Trend” about changes in the classes D1 and F (Fig. 2) can be localized and progressively narrowed down by selecting delimitations in the online yarn classification table.
The online yarn classification table shows possible causes for an increased number of events in the classes D1 and F:
worn out rings in RF
incorrect settings DF
very high hairiness
piecing in DF
incorrect settings and more sliver breaks in SF
improper maintenance of spinning machines
insufficient house keeping
insufficient air conditioning
humidity control and return air
This list demonstrates that the reason for the strong increase in the number of events is most likely due to a dirty drawing device of a ring frame. The regularity of the peaks also shows that the cleaning intervals of the spinning frame need to be adjusted.
The "Lab Trend" information not only enables targeted interventions but also helps to achieve consistent yarn quality and allows optimal planning of the maintenance intervals for production machines, which ultimately results in a reduction of maintenance costs.