Plastic article or earthenware shaping or treating: apparatus – With apparatus assembly or dismantling means or with idle part – Means permitting removal or substitution of elements during...
Patent
1996-02-29
1998-05-26
Mackey, James P.
Plastic article or earthenware shaping or treating: apparatus
With apparatus assembly or dismantling means or with idle part
Means permitting removal or substitution of elements during...
210236, 210447, 210489, 210498, 425197, 425199, B29C 4768
Patent
active
057561290
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to filter members for use in resin extruders (inclusive of kneaders and molding machines) and to screen changers for use in such resin extruders.
2. Discussion of the Background
A filter member for filtering off impurities contained in a resin material is incorporated in the resin passage of resin extruders (inclusive of kneaders and molding machines) adapted to extrude resin materials such as polyolefins and compounds.
A flat-type filter member is known comprising a screen for filtering off impurities and a breaker plate attached to the rear side of the screen for backing up the screen, as disclosed in Japanese Examined Patent Publication No. SHO 59-27698.
Conventional breaker plates have a multiplicity of circular resin passageways, and the ratio of opening thereof is set to about 50% to maintain a strength sufficient to back-up the screen.
For this reason, the filter member has a decreased effective filtering area within a limited area and hence tends to have a larger diameter.
It is a general practice to provide a screen between the resin melt outlet of an extruder or the like and the inlet of a mold (hereby meant to include a granulating die) to filter off impurities contained in resin melt, and to provide a device for changing the used screen soiled by much accumulation of the impurities and the like on the mesh of the screen for a new screen without the need of stopping the operation of the extruder or the like.
Conventionally known ones of this type of screen changer are described in Japanese Unexamined Patent Publication No. SHO 47-39160 and Japanese Examined Patent Publication No. SHO 59-27698. FIG. 21 shows a screen changer 60 as described in Japanese Unexamined Patent Publication No. SHO 47-39160 which includes a slide bar 65 slidably interposed between resin melt outlet 62 of an extruder 61 and inlet 64 of a molding die 63, breaker plates 67A and 67B respectively provided in a pair of resin passageways 66A and 66B extending as intersecting the moving direction of the slide bar 65, and screens 68A and 68B inserted through the breaker plates, each of the screens comprising seven bottomed cylindrical screens.
In changing the screen 68A or 68B for a new one by the screen changer 60, the slide bar 65 is made to slide so as to expose the screen 68A from between the resin melt outlet 62 of the extruder 61 and the inlet 64 of the molding die 63 and to move the other screen 68B to a position between the resin melt outlet 62 of the extruder 61 and the inlet 64 of the molding die 63, and in this condition the screen 68A is changed for a new one.
FIG. 22 shows a screen changer 70 as described in Japanese Examined Patent Publication No. SHO 59-27698 which includes a body 72 having two branched resin passages 71A and 71B and through-holes 72A and 72B extending as orthogonally crossing the resin passages 71A and 71B, respectively, slide bars 73A and 73B slidably installed in the through-holes 72A and 72B, respectively, breaker plates 75A and 75B fitted in resin passage holes 74A and 74B defined in the bars 73A and 73B, respectively, and screens 76A and 76B.
In changing the screens 76A and 76B for new ones by the screen changer 70, the slide bar 73A is made to slide so as to close the resin passage 71A and expose the screen 76A. After changing the screen 76A for a new one while allowing resin to pass through the other screen 76B, the slide bar 73A is made to slide back so as to open the resin passage 71A. Subsequently the other slide bar 73B is made to slide for the screen 76B to be changed for a new one.
With the former conventional changer 60, though the resin filtering area can be increased by increasing the number of bottomed cylindrical screens 68A and 68B, the flow of the resin melt is interrupted during the changing operation and, in addition, the screens has to be changed together with the breaker plate 67A or 67B because the number of the screens is large. Furthermore, the breaker plates 67A and 67B, if in a large pl
REFERENCES:
patent: 2661497 (1953-12-01), Birmingham
patent: 3584355 (1971-06-01), Fischer
patent: 3801248 (1974-04-01), Fischer
patent: 3811659 (1974-05-01), Taylor et al.
patent: 3817377 (1974-06-01), Piggott
patent: 3863001 (1975-01-01), Thumudo, Jr.
patent: 3965010 (1976-06-01), Phillips, Jr. et al.
patent: 4019987 (1977-04-01), Krasnow
patent: 4167384 (1979-09-01), Shirato et al.
patent: 4416605 (1983-11-01), Konno et al.
patent: 4755290 (1988-07-01), Neuman et al.
patent: 5439589 (1995-08-01), Whitman
Kunststoffberater, vol. 37, No. 5, pp. 42-45, May 1, 1992, H. Koching, "Folien/Fasern--Verdichten Scmelze--Filtrierung".
Fukumizu Shin'ichi
Ikeda Osamu
Nagami Nobuki
Nakata Yoshiaki
Yamasaki Nobuhiro
Kabushiki Kaisha Kobe Seiko Sho
Mackey James P.
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