Question

The wet expression for a padding mangle is set at 80 %. If the add-on of a flame retardant chemical required on the fabric is 2 %, then the concentration (g/L) of the chemical in the pad bath is \(\underline{\hspace{2cm}}\).

Hint:

To calculate the concentration of a chemical in a pad bath, divide the chemical add-on percentage by the wet expression of the mangle.

Answer 1

Correct Answer: 25

The wet expression for a padding mangle is given by: \[ \text{Wet Expression} = \frac{\text{Weight of Fabric after Padding}}{\text{Weight of Fabric before Padding}}. \] Given: - Wet Expression = 80% = 0.80. - Add-on of flame retardant chemical = 2% = 0.02. The concentration of the chemical in the pad bath can be calculated using the formula: \[ \text{Concentration} = \frac{\text{Add-on of Chemical}}{\text{Wet Expression}} = \frac{0.02}{0.80} = 0.025 \, \text{g/L}. \] Thus, the concentration of the chemical in the pad bath is 25 g/L.