PURPOSE: To obtain a nonwoven fabric having excellent uniformity, etc., and soft feeling and useful as medical and sanitary materials, etc., by introducing plural specific conjugated filaments into an air sucker, depositing the fibers on a collection face to form a web and developing the crimps simultaneous to the heat-welding of the web.
CONSTITUTION: A plural number of conjugated filaments (having crimp number of 15-150/25mm and lateral crimping property free from three-dimensional entanglement) of side-by-side type, etc., composed of different or same kind of thermoplastic polymers having different viscosities are continuously introduced into an air sucker and deposited on a moving collection face by the action of an air jet to form a web. The latent crimps are developed simultaneous to e.g. heat-welding by pressing with an emboss roll (heated at a temperature lower than the melting point of the low-melting polymer or the conjugated filament by 15-30°C) at a pressure-welding areal ratio of 4-40% to obtain the objective nonwoven fabric having a bulk density of ≤0.1g/cm3.
MIYAHARA YOSHIMOTO
KASEYA SATOSHI
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