Patent ID: 8632058

Claim:
A micro-bubble generating device disposed in water and configured to generate micro-bubbles and eject and disperse the micro-bubbles into the water, the micro-bubble generating device comprising: a micro-bubble generating sleeve wherein a cylindrical body of a gas-permeable film formed by generating crazes in a high molecular weight resin film is fitted on an outer circumferential surface of a cylindrical substrate having a gas flow hole formed through its cylindrical wall and open in the outer circumferential surface, and wherein a hydrophilic unwoven fabric layer is formed on an outer circumferential surface of the cylindrical body, whereby a gas fed from the gas inlet hole of the cylindrical substrate changes into the micro-bubbles during permeation of the gas through the cylindrical body and the unwoven fabric layer; rotary driving means for rotating the micro-bubble generating sleeve about its axis, to eject the micro-bubbles from an outer surface portion of the unwoven fabric layer into the water, during rotation of the micro-bubble generating sleeve; and a gas introducing mechanism for introducing the gas from an external source into a space within a sleeve of the cylindrical substrate, during the rotation of the micro-bubble generating device by the rotary driving means.