Agitating – Rubber or heavy plastic working – Stationary mixing chamber
Patent
1995-01-06
1996-05-28
Cooley, Charles E.
Agitating
Rubber or heavy plastic working
Stationary mixing chamber
366300, 366301, B29B 720
Patent
active
055204554
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a meshing blade type batch kneader used in mixing polymeric materials, e.g., rubber materials.
RELATED STATEMENT
A batch type kneader is generally used in a so-called master batch process for making the physical properties of different types of materials even, in which compounding agents such as carbon, and oil are mixed with polymeric materials which are raw materials of tire products and general industrial products.
Tangential type kneaders and meshing type kneaders, examples of which are shown in FIGS. 19 through 22, are known as this type of batch kneader.
A kneader shown in FIG. 19 will be hereinafter referred to as a first conventional example. This first conventional example is disclosed in Unexamined Japanese Utility Model Publication No. SHO 63-136908. In this example, a kneading chamber 22 is formed in a closed interior enclosed by a casing 21 and an end frame, not shown. A pair of wing rotors 23 are disposed in the chamber 22 parallel to each other in such a way as to rotate in opposite directions. A communicating path 24 is formed between the rotors 23 so as to extend over almost the entire length of the chamber 22. A hopper 25 for feeding materials is formed at an upper part of the chamber 22 along the center line of the chamber 22 that corresponds to the communicating path 24. A ram 26 for forcing materials is removably fitted to an upper part of the hopper 25, and an exhaust port 27 for mixed materials is formed at a lower part of the chamber 22. A door 28 is removably fitted to the exhaust port 27.
A main wing and an aileron, neither shown, are attached to each of the rotors 23, and the aileron is arranged in such a manner as to be synchronized with the main wing of the respective rotor at the center of the rotor.
A kneader shown in FIG. 20 (a second conventional example) is disclosed in Unexamined Japanese Patent Publication No. SHO 63-306006. The main construction of this kneader is the same as that of the first example shown in FIG. 19, but a plurality of pins 29 are provided around barrel wings of both rotors 28. This increases the capacity for taking materials into the chamber 22.
A kneader (a third conventional example) shown in FIGS. 21 and 22 is disclosed in Examined Japanese Patent Publication No. SHO 63-1093. The main construction of this kneader is the same as that of the first conventional example shown in FIG. 19. A ratio of the length L of the rotor 23 to an inner diameter D of the chamber is set to 1.25.+-.0.1; a ratio l/L of the length l of a main wing 30 to the length L of the rotor is set to 0.5-0.7; a ratio a/L of a length a of a part of the rotor without the wing to the length L of the rotor is set to 0.15-0.35; an angle .theta. of torsion is set to 55.degree..+-.5.degree.; and a ratio S/D of a tip clearance S to the inner diameter D of the chamber is set to 0.0275.+-.0.0075. The object of this kneader is to make the distribution of temperatures even so as to speed up the transfer of heat by increasing the speed of movement of the materials.
Here, it is said that the meshing type batch kneader is inferior in productivity to the tangential type kneader. Moreover, the meshing type batch kneader is designed on the basis of the ratio S/D of the tip clearance S to the inner diameter D of the chamber, and hence, materials shearing force between the rotors 23 is limited by the ratio S/D.
The previously mentioned prior art is inferior to the tangential type kneader in terms of the capacity for biting materials. This is attributable to a small space between the rotors. When the time required for biting materials, in other words, a ram sheet time, is increased, the time for mixing all introduced materials is reduced, which in turn results in increased variations for each batch. To eliminate this problem, it is necessary to fractionize materials into small pieces at higher speed between the rotors and the chamber, or between the rotors.
In the first conventional example, the rotors have only a few teeth which rotate with clearanc
REFERENCES:
patent: 4184773 (1980-01-01), Ellwood
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patent: 4456381 (1984-06-01), Inoue et al.
patent: 4718771 (1988-01-01), Asai et al.
patent: 4859074 (1989-08-01), Asai et al.
Hagiwara Katsunobu
Hayashida Sumio
Nakamoto Norihiko
Tanaka Tatsuya
Yamada Norifumi
Cooley Charles E.
Kabushiki Kaisha Kobeseikosho
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