Agitating – Rubber or heavy plastic working – With specified vent means
Patent
1995-11-30
1997-09-30
Soohoo, Tony G.
Agitating
Rubber or heavy plastic working
With specified vent means
366 79, 366 80, 366 82, B29B 738, B01F 708
Patent
active
056720050
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to kneaders (including kneading extruders) with vent function which are adapted to plasticize and homogeneously knead material containing rubber or resin and, admixed therewith, additives such as pigment and reinforcing materials such as glass fiber, and more particularly, to the rotor configuration of such kneaders.
2. Discussion of the Background
Known kneaders of this type include one illustrated in FIGS. 12 to 15 (refer to Japanese Unexamined Patent Publication No. HEI 4-28505).
In FIG. 12, the kneader 1 includes an elongated barrel (casing) 2 laid on a base 8 through support legs 9, the barrel 2 having at one axial end thereof a supply inlet 13 for material to be kneaded (rubber, resin or the like) and at the other axial end thereof a discharge outlet 15 kneading chambers 6 and 7 axially extending from the supply inlet 13 to the discharge outlet 15 and a rotor inserted into the kneading chambers 6 and 7 which is rotatable about the axis by rotor drive means 4.
A gating device 5 is provided intermediate the axis of the barrel 2, and a dam portion 12 in the form of ring, corresponding to the gating device 5, is provided to the rotor 3 and divides the kneading chamber in terms of the axis into first kneading chamber (first kneading stage) 6 and second stage kneading chamber (second kneading stage) 7. A vent port 14 communicating with the second stage kneading chamber 7 is formed in the barrel 2 at a location adjacent the gating device 5.
The kneading chambers 6 and 7 are shaped like eyeglasses in cross section, each eyeglass portion radially communicating with the other. A pair of rotors 3 are inserted into respective eyeglass portions and adapted to rotate inward with respect to each other as indicated by arrows in FIG. 15.
The pair of rotors 3 each has, on the periphery thereof along the axis, a feed portion 10A comprising screw tip 19 and a kneading portion 11A comprising kneading wing within the first kneading chamber 6, and a feed portion 10B comprising screw tip 19 and a kneading portion 11B comprising kneading wing within the second kneading chamber 7.
The feed portion 10A within the first stage kneading chamber 6 is adapted to plasticize and transport the material to be kneaded which is introduced through the supply inlet 13, while the feed portion 10B within the second stage kneading chamber 7 is adapted to transport the material in melted state.
The gating device 5 includes a pair of upper and lower gating members 16 and 17 fittedly inserted into corresponding slide guide portions 16A and 17A formed in upper and lower portions of the barrel 2 for movement toward and away from the dam portion 12. The gating members 16 and 17 respectively have gating portions 16B and 17B in tapered configuration as shown in FIG. 13, so as to be capable of regulating resin channel 21 by way of drive means 18.
As shown in FIG. 9, the first kneading portion 11A and second feed portion 10B of the rotor 3 inserted in the kneading chambers 6 and 7 of the same diameter D have substantially the same outer diameter, while the dam portion 12 situated between these portions is smaller than them in outer diameter, whereby impulsive spaces S1, S2 and S3 are transversely defined between right and left dam portions 12,12 and between the dam portion 12 and the internal surface of the barrel 2 as shown in FIG. 15. The screw tip 19 of the feed portion 10B, when viewed in section in FIG. 14, has a material feed surface 19B on one side thereof and a material feed back surface 19C on the other side which are both flat and upright and extend from inwardly rounded surfaces 20 formed in the base portion of the tip. Thus, when the rotor 3 is rotated, the material to be kneaded is fed (or pushed forward) by the material feed surface 19B.
To prevent short pass conventionally, the art described in Japanese Unexamined Patent Publication No. HEI 4-28505 allows the upper and lower gating members 16 and 17 to shut the impulsive spaces S1, S2 and S3 as shown in
REFERENCES:
patent: 2765490 (1956-10-01), Zona
patent: 3667733 (1972-06-01), Fritsch
patent: 4131368 (1978-12-01), Iddon
patent: 4431311 (1984-02-01), Kolossow
patent: 4519712 (1985-05-01), Barr
patent: 4542992 (1985-09-01), Markhart
patent: 4558954 (1985-12-01), Barr
patent: 4746220 (1988-05-01), Sukai et al.
Fukui Tsugushi
Inoue Kimio
Kashiwa Masahiko
Kuroda Yoshinori
Ueda Hiroshi
Kabushiki Kaisha Kobeseikosho
Soohoo Tony G.
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