Evenness Defects Per KM Counter

Count contiguous thin/thick yarn episodes rather than every sample, normalizing by inspected length and reporting out-of-band length; thresholds are caller method definitions.

Description

Consecutive thin or thick yarn samples can represent one defect episode.

Consecutive thin or thick yarn samples can represent one defect episode. Counting every sample would depend on sampling resolution.

Count contiguous thin/thick yarn episodes rather than every sample, normalizing by inspected length and reporting out-of-band length; thresholds are caller method definitions.

When to use Evenness Defects Per KM Counter

Use this tool to count contiguous thin/thick yarn episodes rather than every sample, normalizing by inspected length and reporting out-of-band length; thresholds are caller method definitions.

Prepare cocoon, larval, leaf or reeling measurements on a consistent batch and moisture basis. Use the declared mass, length and time units.

How to use Evenness Defects Per KM Counter and understand its results

Prepare cocoon, larval, leaf or reeling measurements on a consistent batch and moisture basis. Use the declared mass, length and time units.
Enter segmentLengthsM, relativeLinearDensities, thinThresholdRatio, thickThresholdRatio using the field table and calculation rules, then run the tool.
Read thinEventCount, thickEventCount, thinEventsPerKm, thickEventsPerKm, outOfBandLengthFraction. The explanation below defines the units, signs, ordering and any flags or placeholder values.
If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.

Input field	Meaning	Value type; see rules below	Requirement
segmentLengthsM	Segment lengths m	list of number	Required
relativeLinearDensities	Relative linear densities	list of number	Required
thinThresholdRatio	Thin threshold ratio	number	Required
thickThresholdRatio	Thick threshold ratio	number	Required

Align positive segment lengths with nonnegative relative densities. Require a positive thin threshold below one and thick threshold above one. Strict crossings form classes; a class change starts a new event. Return episode counts, rates and out-of-band length fraction.^[1]

Paired lists must be nonempty and have equal lengths.

defects/km = contiguous class episodes × 1000/inspected meters

Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.

Output field	Meaning	Value type
thinEventCount	Thin event count	number
thickEventCount	Thick event count	number
thinEventsPerKm	Thin events per km	number
thickEventsPerKm	Thick events per km	number
outOfBandLengthFraction	Out of band length fraction	number

json

{
  "input": {
    "segmentLengthsM": [
      100,
      200,
      100
    ],
    "relativeLinearDensities": [
      0.7,
      0.8,
      1.3
    ],
    "thinThresholdRatio": 0.9,
    "thickThresholdRatio": 1.2
  },
  "output": {
    "thinEventCount": 1,
    "thickEventCount": 1,
    "thinEventsPerKm": 2.5,
    "thickEventsPerKm": 2.5,
    "outOfBandLengthFraction": 1
  }
}

Limitations and assumptions

Thresholds define the caller method; no universal grade is assigned.

Numbers and computed results must be finite; overflow produces an error. Numeric lists are limited to 100,000 entries; the rules above may require smaller limits. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.

Alternative or Complementary methods

Use Tenacity From Breaking Force: Normalize matched yarn breaking force to cN/tex and audit a caller threshold; force is not fabric strength and method conditioning is external. For a complementary task, use Denier From Length Weight: Infer filament denier as grams per 9000 meters, returning sample values and length-weighted pooled linear density; redundant denier/tex conversion aliases excluded.

References

Evenness Defects Per KM Counter — tool.io

Similar or alternative tools

Tenacity From Breaking Force
Normalize matched yarn breaking force to cN/tex and audit a caller threshold; force is not fabric strength and method conditioning is external.
Denier From Length Weight
Infer filament denier as grams per 9000 meters, returning sample values and length-weighted pooled linear density; redundant denier/tex conversion aliases excluded.