Degree of order in a semi-crystalline fibre is determined by the following equation (where ρc, Sa and ρ1 represent densities of 100%crystlline, 100% amorphous and semi crystalline fibre, respectively) in density gradient measurement principle
- (ρf-ρa)/(ρc-ρa)
- (ρsub>c-ρsub>a)/(ρsub>f-ρsub>a)
- (ρsub>a-ρsub>c)/(ρsub>c-ρsub>f)
- (ρsub>c-ρsub>f)/(ρsub>a-ρsub>f)