Method for manufacturing inorganic particle composite fiber sheet

A method for manufacturing an inorganic particle composite fiber sheet, said method comprising:

• a composite fiber generating step of generating composite fibers composed of cellulosic fibers and inorganic particles by synthesizing the inorganic particles in slurry containing the cellulosic fibers;
• and
• a sheet generating step of continuously generating a sheet by supplying composite-fiber containing slurry including the composite fibers to a continuous paper machine,
• the composite fiber generating step being carried out while using slurry in which (i) cellulosic fibers having a length of 1.2 mm to 2.0 mm are contained in an amount of 16% or more in terms of length-weighted fiber length distribution (%) and (ii) cellulosic fibers having a length of 1.2 mm to 3.2 mm are contained in an amount of 30% or more in terms of length-weighted fiber length distribution (%),
• wherein the method further comprises, before the composite fiber generating step, a slurry preparing step of preparing the slurry by beating the cellulosic fibers and mixing, with a raw material for synthesizing the inorganic particles, the cellulosic fibers which have been beaten.