Microbubble creating method using a forming machine

A microbubble creating method for creating microbubbles in a polymer using a forming machine, said forming machine comprising a feed screw and a microbubble generator, said microbubble generator comprising a locating ring, a microbubble generating member, a holder member, and a static mixer, said locating ring being mounted at a front end of said feed screw, said microbubble generating member being mounted at said locating ring, said microbubble generating member comprising a perforated tip protruded over a surface of said feed screw, said holder member comprising a runner disposed in communication between said feed screw and a mold, said static mixer mounted in front of said runner of said holder member and away from said front end of said feed screw, the microbubble creating method comprising the steps of:

• a) driving said feed screw to propel a fluid polymer, enabling said perforated tip of said microbubble generating member to be immersed in the fluid polymer and be surrounded by said fluid polymer;
• b) starting up said microbubble generator to fill a gas into an air passage in said feed screw, enabling said gas to be heated when flowing through said air passage;
• and
• c) enabling the heated said gas to flow from said air passage of said feed screw into, said microbubble generating member for creating microbubbles after passed through said perforated tip of said microbubble generating member so that the created said microbubbles are mixed with said fluid polymer subject to rotation of said feed screw, and the created said microbubbles are mixed with said fluid polymer subject of said static mixer again, and said fluid polymer passed through by said runner of said holder member into said mold.