To produce a heat-resistant composite nonwoven fabric having flame retardance and heat resistance and further excellent flexibility, bulkiness and dimensional stability in combination.
This heat-resistant composite nonwoven fabric is obtained by carrying out the hot pressure welding treatment in a continuous filament nonwoven web, thereby forming a continuous filament nonwoven web layer having hot pressure welded points, then laminating staple fiber nonwoven web layers having the flame retardance imparted thereto to both surfaces of the resultant continuous filament nonwoven web layer, performing the pressurized liquid treatment of the formed laminate, thereby forming three-dimensional tangles among the constituent filaments of the continuous filament nonwoven web layer and the constituent staple fibers of the staple fiber nonwoven web layers and the mutual constituent staple fibers of the staple fiber nonwoven web layers, and integrating the filaments with staple fibers as a whole. The resultant heat-resistant composite nonwoven fabric has ≥0.01 and <0.1g/cm3 bulk density.
MATSUNAGA ATSUSHI
IIMI MICHIYO
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