Agitating – Rubber or heavy plastic working – Stirrer is through-pass screw conveyor
Patent
1996-12-20
1998-08-11
Soohoo, Tony G.
Agitating
Rubber or heavy plastic working
Stirrer is through-pass screw conveyor
366300, B01F 708
Patent
active
057917760
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention is one of kneading apparatuses which is hermetically closed and kneads a batch of material in it. In addition, this invention makes productivity improve.
BACKGROUND ART
Rubber used in tire and so on is uniform mixture of a crude rubber and additives such as sulphur, carbon and filler etc. A hermetically closed kneading apparatus is used for kneading the crude rubber and the additives. By using such the hermetically closed kneading apparatus, a plastic degree of the rubber falls down and a dispersion of additives is carried out. By the way, a rubber used for a radial tire of automobile is rigid, therefore, it is difficult to make the dispersion of additives uniform in comparison with any other rubber.
In view of this problem, some prior hermetically closed kneading apparatuses are shown in Patent publications of No.58-4567 and 58-5094, which can carry out the uniform dispersion of additives in comparison with any other prior apparatuses.
One of the prior hermetically closed kneading apparatuses shown in the above Patent publications possesses one pair of rotors in a chamber of which sectional view looks like a shell of a cocoon. The each rotor is arranged in parallel with each other without meshing with each,other and rotates in a contrary direction to each other.
The each rotor has 4 total number of blades to include 2 number of long blades and 2 number of short blades. The each long blade is apart from each other by an equivalent angle in a circumferential direction of the rotor. The each short wing is also apart from each other by an equivalent angle in the circumferential direction of the rotor. Moreover, a thrust ratio, a blade length ratio and so on of the long blade to the short blade are established adequately as for each rotor. In other words, a kneading operation of the prior hermetically closed kneading apparatus is made to improve by means of increasing the total number of the blades from 2 to 4 blades.
Nowadays, a hardness of rubbers tends to become higher in order to make a quality of tires improve. Accordingly, a uniformity concerning the dispersion of the additives is strictly required.
Even though the rotor having 4 total number of blades as mentioned above is used, the additives will not be uniformly dispersed for a desired kneading time. Consequently, a kneading time tends to become long. In case the kneading time is long, temperature of a kneaded rubber rises and vulcanization and so on happen, finally, a quality of rubber changes. For this reason, when the temperature of the kneaded rubber rises to a certain degree, the kneaded rubber is taken out from the chamber and cooled. And then the kneading operation is performed again after the cooling. Thus, the kneading step is achieved over a plurality of alternate performances with respect to the kneading and cooling operation. When the kneading step is achieved over plurality of performances like this, a productivity per unit time of kneading apparatus will fall down drastically.
A hermetically closed kneading apparatus of a sealing type is shown in Patent Publication Number Showa 63-47107 (U.S. Pat. No. 4,871,259), which reduces number of performances concerning the kneading operation and improves a kneading efficiency. This hermetically closed kneading apparatus possesses one pair of rotors in a chamber of which sectional view looks like a shell of a cocoon. Each rotor is arranged in parallel with each other without meshing with each other and rotates in a contrary direction to each other.
The each rotor has 3 number of long blades and 3 number of short blades. The each long blade is apart from each other by an equivalent angle in a circumferential direction,of the rotor. The each short blade is also apart from each other by an equivalent angle in the circumferential direction of the rotor. The long blades and the short blades are joined respectively. In a view of the rotor profile, a rear surface of each blade with respect to a rotation direction is cut off by a line which intersects a tangent line for
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Kurokawa Yoshinori
Takakura Ko
Ureshino Kashiro
Yamada Norifumi
Kabushiki Kaisha Kobe Seiko Sho
Soohoo Tony G.
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