Description and working procedure The scouring process in a J-Box can be divided into four units. Impregnation Box Pre-heater J-box Washing Unit. Standard Recipe: Alkali —————————– 4-6 gm/l Wetting Agent ——————- 4-5 gm/l Pick Up —————————- 90-100 % Impregnation Temperature —— 70-80ºc Impregnation Time ————— 40-90 sec Storing Time in J-Box ———— 1-2 hrs