Process for production of inorganic fiber mats

A method of producing an inorganic fiber mat, the method comprising:

• a fiber collection step of applying a binder to inorganic fibers and accumulating in a mat shape on a conveyor line to form an inorganic fiber web;
• a binder-curing step of heat-curing the binder applied to the inorganic fiber web to form an inorganic fiber mat;
• and
• an aldehyde scavenger application step of applying an aldehyde scavenger to the inorganic fiber mat,
• wherein the aldehyde scavenger application step involves spraying the aldehyde scavenger in a form of droplets having an average diameter of 1 to 50 μm on a front side of the inorganic fiber mat,
• wherein the aldehyde scavenger application step involves forming an air curtain by blowing a gas from a discharge opening of an air nozzle leaning towards the direction in which the inorganic fiber mat is forwarded on the front side of the inorganic fiber mat in a downstream side of a site where the aldehyde scavenger is sprayed on the conveyor line for the inorganic fiber mat, and
• wherein the aldehyde scavenger application step involves performing suction from a back side of the inorganic fiber mat just below a site where the air curtain is formed.