Nanjing GIANT Machinery Co.,Ltd.

A Twin Screw Extruder is constructed by providing a pair of Single Screw Extruder in a barrel having a chamber extending from one side to the other side, each of the being a combination of kneading segments, such as kneading rotors and kneading disks, and segments. A kneaded product is continuously produced by a series of operations of charging a material to be kneaded, such as rubber and plastic, into the barrel through an inlet at one side, kneading the charged material by the kneading segments while feeding the material toward the other side with the rotation of sheet production extruder, thereby forming a kneaded product in a desired state of kneading, and kneaded product to the outside from a tip end of thegear pump (see FIGS. 1A and 1B for general construction).

The above-mentioned kneading rotors have tip clearances greater than those of the kneading disks, and therefore are advantageous in that a target material of kneading, which comprises a material to be kneaded and a kneaded material, can be kneaded at relatively low temperatures. However, since the greater tip clearances render the target material of kneading to adhere to an inner wall surface of the barrel, the kneading rotors have disadvantages that a trouble, such as a deterioration of the target material of kneading due to residence for a long time in the barrel or a damage of the due to a load partially imposed on the kneading rotors, is more likely to occur.

Recently, in view of the above-mentioned disadvantages, there has been proposed a comprising, as shown in FIG. 11, a pair of kneading rotors and each having kneading blades and that are formed to have contour shapes allowing the kneading rotors and o completely mesh with each other when a pair of left and sets are arranged as shown, particular one a of the kneading blades being formed to provide a smaller tip clearance and the kneading blade having a greater tip clearance serves to knead and disperse the target material of kneading into a satisfactory state, thereby preventing an excessive temperature rise.

With the construction described above, since a flow condition of the material under kneading is changed depending on the twisting direction of the kneading rotors, a filling state of the material under kneading in the rotor segment can be set to any desired degree by forming the rotor segment in a proper combination of three types of kneading rotors having different twisting directions. As a result, the rotor segment can be formed so as to have the mixing and dispersing abilities optimum for properties of the material to be kneaded, or the feeding ability optimum for the material to be kneaded Twin Screw Extruder.