Statistical Profile
A graphic or numerical representation of the distribution of fibre lengths within a sample provides a detailed look at material quality. The staple length array shows the proportion of long, medium and short fibres in a batch of flax tow. This data is more useful than a single average length measurement.
Laboratory Method
Technicians use a comb sorter to align the fibres and arrange them in descending order of length on a velvet board. To create a staple length array, the sorted fibres are weighed in groups at five-millimetre intervals. This process is repeated several times to ensure the results are statistically valid.
The resulting curve indicates the uniformity of the harvest. A steep curve suggests a consistent crop, while a flat curve reveals a high degree of variation. Computerized imaging systems now automate this task by scanning the spread fibres and calculating the distribution instantly.
This analysis helps determine the waste potential of the lot.
Spinning Performance
Draft settings on the spinning frame are adjusted based on these findings. A staple length array helps the mill manager predict the amount of waste that will be generated during hackling. It also indicates the potential strength of the finished yarn.
