Influence of pleat geometry on filter cleaning in PTFE/glass composite filter

Figures & data

Figure 1. SEM image and pore size distribution of PTFE/glass composite filter.

Figure 2. Pleating process with knife pleater.

Figure 3. Geometry of a pleated cartridge filter.

Figure 4. Experimental apparatus for the filtration test.

Figure 5. Filtration area of pleated cartridge filters with different pleat pitch and pleat height.

Table 1. Relationships Among Pleating Parameters

	Pleat angle, θ			Pleatlength,
	15.6°	18.6°	23.0°	PL (mm)
Number of pleats, N [each]	65	54	44	15
	43	36	29	20
	30	25	20	25
Pleat pitch, PP [mm]	5.6	6.7	8.2	15
	8.4	10.0	12.5	20
	12.0	14.5	18.1	25
Filtration area, A [m^2]	2.6	1.8	1.5	15
	1.9	1.6	1.3	20
	1.7	1.4	1.1	25

Figure 6. Change in pressure drop at different P_L and θ (v = 3 m/min, jet pressure = 4 kg_f/cm², C_i  = 5.7 g/m³).

Figure 7. Cleaning efficiency of a pleated cartridge filter with various pleat geometries.

Table 2. Dimensionless Parameter, α, at Various Pleat Geometries

	Pleat angle, θ			Pleat length,
	15.6°	18.6°	23.0°	PL (mm)
Dimensionless parameter, α [—]	2.67	2.21	1.79	15
	1.77	1.48	1.18	20
	1.23	1.02	0.81	25

Figure 8. Filter cleaning interval as a function of α.