Knowledge Center

HVI Princple

Length Testing: Optical Principle
Strength Testing: Constant Rate of Elongation
Fineness Testing: Air Flow Method
Trash: Image Analysis

Parameters

Fiber Length :
2.5% Span Length, 50% Span length, Upper Half Mean Length, Mean Length,Short Fiber Index
Fiber Length Uniformity:
Uniformity Index (%); Uniformity Ratio (%)

Fiber Fineness: Micronaire
Fiber Strength: g/tex
Fiber Color: Rd (Reflectance); +b (Yellowness); Color Grade

Micronaire

Mic Description
Less than 3.0 Very Fine
3.0 to 3.6 Fine
3.7 to 4.7 Medium
4.8 to 5.4 Coarse
5.5 and Higher Very Coarse

Fiber Bundle Strength

Fiber Strength (g/tex) Description
Less than 21 Very Weak
22 to 24 Weak
25 to 27 Medium
28 to 30 Strong
31 and Higher Very Strong

Uniformity Index

UI% Description
Below 77 Very Low
77 to 79 Low
80 to 82 Intermediate
83 to 85 High
85 and Higher Very High

Short Fiber Index

SFI% Description
Below 6 Very Low
6 to 9 Low
10 to 13 Intermediate
14 to 17 High
18 and Higher Very High