Fiber Classification and the Influence of Average Air Humidity

Figures & data

FIG. 1 Schematic of fiber classification system.

TABLE 1 JM-475 Glass chemical composition (wt%)

SiO2	A12O3	Fe2O3	MgO	CaO	Na2O	K2O	B2O3	F	BaO	ZrO2	ZnO
58.4	5.95	0.05	0.18	1.77	9.6	3.03	11.04	0.56	4.88	0.03	4.88

FIG. 2 Schematic of water adsorption experiment.

TABLE 2 Glass fiber classification under different conditions

Fiber length (μm)	Measured length range (μm)	Applied voltage (kV)	Inner/Outer Sheath flow (LPM)	Fiber aerosol flow rate (LPM)	Sheath flow relative humidity (%)
5	4–6 ^a	6.56	4.0/4.0	0.5	75
10	9–12 ^b	4.00	4.0/4.0	0.5	75
30	25–33 ^c	1.52	4.0/4.0	0.5	75

TABLE 3 Carbon fiber classification under different conditions

Fiber length (μm)	Measured length range (μm)	Applied voltage (kV)	Inner/Outer Sheath flow (LPM)	Fiber aerosol flow rate (LPM)	Sheath flow relative humidity (%)
155	150–160 ^a	0.25	2.0/2.0	1.25	< 5
70	65–75 ^b	0.50	2.0/2.0	1.25	< 5

FIG. 3 Humidity of medium air vs classification percentage.

FIG. 4 The weight of a glass fiber block under different humidity of medium air.

TABLE 4 Water extraction analysis

	Water extraction of glass fiber block			Water extraction of glass beads beads			Water
	pH	Conductance (μS/cm)	S/V, × 10^4	pH	Conductance (μS/cm)	S/V, × 10^4	pH	Conductance (μS/cm)
1	8.93	35.9	1.40	9.42	85.6	1.27	6.71	0.581
2	8.77	22.2	0.42	9.16	31.4	0.50	6.97	0.500