Modeling and Optimizing of Producing Recycled PET from Fabrics Waste via Falling Film-Rotating Disk Combined Reactor

Table 5

Main performance indexes of recycled PET staple fiber (6.67 dtex 51 mm).

Performance indexes	Fabrics	Fabrics	Bottle flakes
Polydispersity index (PDI)	2.40	2.16	—
Deviation of linear density (%)	±10	±10	±10
Length deviation (%)	±10	±8.0	±8.0
Curl number (per/25 mm)	7 ± 2.0	7 ± 2.0	8 ± 2.0
Double length fiber (mg/100 g)	≤100	≤30	≤30
Defect content (mg/100 g)	≤2000	≤100	≤80
Filling power (cm^3/g)	—	168 ± 3	175 ± 3
Filling power (cm^3/g)	—	50 ± 2	54 ± 2
Filling power (cm^3/g)	—	145 ± 2	145 ± 2
Compression resilience ratio (%)	—	≥68	≥70
Hollowness (%)	—	18 ± 3	22 ± 3
Breaking strength (cN/dtex)	2.6	3.6	4.2

waste without liquid-phase polymerization. waste with liquid-phase polymerization in the falling film-rotating disk combined reactor. flakes waste without liquid-phase polymerization.