USRE37681E1 - Filter member and screen changer for use in resin extruder - Google Patents

Filter member and screen changer for use in resin extruder Download PDF

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Publication number
USRE37681E1
USRE37681E1 US09/579,438 US57943800A USRE37681E US RE37681 E1 USRE37681 E1 US RE37681E1 US 57943800 A US57943800 A US 57943800A US RE37681 E USRE37681 E US RE37681E
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United States
Prior art keywords
resin
screen
plate
extruder
breaker
Prior art date
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Expired - Lifetime
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US09/579,438
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English (en)
Inventor
Yasuo Yoshii
Nobuki Nagami
Nobuhiro Yamasaki
Yoshiaki Nakata
Shinichi Fukumizu
Osamu Ikeda
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Kobe Steel Ltd
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Kobe Steel Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP6151243A external-priority patent/JP2892282B2/ja
Priority claimed from JP6152496A external-priority patent/JP2778914B2/ja
Application filed by Kobe Steel Ltd filed Critical Kobe Steel Ltd
Priority to US09/579,438 priority Critical patent/USRE37681E1/en
Assigned to GENERAL ELECTRIC CAPITAL CORPORATION, AS AGENT reassignment GENERAL ELECTRIC CAPITAL CORPORATION, AS AGENT SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: RAWLINGS SPORTING GOODS COMPANY, INC.
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Publication of USRE37681E1 publication Critical patent/USRE37681E1/en
Anticipated expiration legal-status Critical
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/69—Filters or screens for the moulding material
    • B29C48/694—Cylindrical or conical filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/69—Filters or screens for the moulding material
    • B29C48/691—Arrangements for replacing filters, e.g. with two parallel filters for alternate use
    • B29C48/6912—Arrangements for replacing filters, e.g. with two parallel filters for alternate use the filters being fitted on a single rectilinearly reciprocating slide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/69—Filters or screens for the moulding material
    • B29C48/693—Substantially flat filters mounted at the end of an extruder screw perpendicular to the feed axis

Definitions

  • 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.
  • 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 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.
  • the filter member has a decreased effective filtering area within a limited area and hence tends to have a larger diameter.
  • 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 67 A and 67 B respectively provided in a pair of resin passageways 66 A and 66 B extending as intersecting the moving direction of the slide bar 65 , and screens 68 A and 68 B inserted through the breaker plates, each of the screens comprising seven bottomed cylindrical screens.
  • the slide bar 65 is made to slide so as to expose the screen 68 A 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 68 B 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 68 A 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 71 A and 71 B and through-holes 72 A and 72 B extending as orthogonally crossing the resin passages 71 A and 71 B, respectively, slide bars 73 A and 73 B slidably installed in the through-holes 72 A and 72 B, respectively, breaker plates 75 A and 75 B fitted in resin passage holes 74 A and 74 B defined in the bars 73 A and 73 B, respectively, and screens 76 A and 76 B.
  • the slide bar 73 A is made to slide so as to close the resin passage 71 A and expose the screen 76 A.
  • the slide bar 73 A is made to slide back so as to open the resin passage 71 A.
  • the other slide bar 73 B is made to slide for the screen 76 B to be changed for a new one.
  • the resin filtering area can be increased by increasing the number of bottomed cylindrical screens 68 A and 68 B, 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 67 A or 67 B because the number of the screens is large. Furthermore, the breaker plates 67 A and 67 B, if in a large plant are heavy and hot, resulting in troublesome changing operations and in difficulty in cleaning.
  • the latter conventional changer 70 has advantages that the flow of resin is never interrupted in changing the screens 76 A and 76 B because the resin passage is branched into two and that the changer facilitates the changing operations.
  • the slide bars 73 A and 73 B are shaped like logs, and the breaker plates 75 A and 75 B are shaped circular for the ease of fabrication. With such circular breaker plates, if the filtering area is desired to be enlarged, the slide bars must be also enlarged in diameter, resulting in the body enlarged, hence, in the overall device enlarged. This raises critical problems in terms of space and cost.
  • a first object of the present invention to provide a filter member having an increased effective filtering area in a limited area and hence allowing for minimization of the size thereof by forming slit-like resin passageways in a breaker plate so as to ensure an increased ratio of opening (70% to 80%) without any deterioration in the back-up capability.
  • the present invention provides the following technical means in a filter member comprising in combination a screen for filtering off impurities contained in a resin material flowing in an extruder and a breaker plate having a multiplicity of resin passageways and attached to the rear side of the screen for backing up the screen.
  • the present invention is characterized in that the resin passageways of the breaker plate are configured into elongated slits extending in a direction intersecting the flow direction of resin.
  • the breaker plate comprise a first plate on the upstream side thereof and a second plate on the downstream side thereof which are mated to each other, the slits of one of the first and second plates being larger in width than those of the other plate and extending as intersecting those of the other plate.
  • the breaker plate comprise a first plate on the upstream side thereof and a second plate on the downstream side thereof which are mated to each other, the resin passageways of the first plate being configured into elongated slits, and those of the second plate being configured into circular holes.
  • the face of the breaker plate defining the resin passageways may be configured circular or rectangular, and it is desired that the screen and the breaker plate respectively comprise curved surfaces having a single curvature which protrude in the extrusion direction or the direction opposite thereto.
  • a resin material extruded from an extruder is filtered for its impurities by the screen of the filter member in the course of its flowing in the direction indicated by the arrow in FIG. 1 (A).
  • the resin passageways of the breaker plate in the filter member are configured into elongated slits extending as intersecting the direction of the arrow, the back-up capability of the breaker plate can be sufficiently ensured even when the ratio of opening of the slits is increased relative to that of circular holes.
  • the present invention provides the following technical means.
  • the present invention provides a screen changer for use in a resin molding machine which is adapted to change a screen disposed at a resin melt outlet of an extruder or the like to filter off impurities contained in a resin melt
  • the screen changer comprising: an changer body in which a resin passage is divided into divided passages juxtaposed to each other in the middle of a course of the resin passage from a resin melt inlet to a resin melt outlet and in which a screen holding bar receiving bore is provided extending through the changer body as generally orthogonally intersecting each of the divided passages; a screen holding bar slidably fitted through the bore; and a screen including a bottomed cylindrical strainer and a screen mesh and mounted in one or two resin melt passage holes defined in the bar, the resin melt passage holes being capable of communicating with each of the divided passages and extending as orthogonally intersecting the axis of the bar.
  • the screen mesh of the screen be removably attached to the strainer.
  • the present invention further provides a screen changer comprising: an changer body in which a resin passage is divided into divided passages juxtaposed to each other in the middle of a course of the resin passage from a resin melt inlet to a resin melt outlet and in which a screen holding bar receiving bore is provided extending through the changer body as generally orthogonally intersecting each of the divided passages; a screen holding bar slidably fitted through the bore; a screen changeably mounted in one or two resin melt passage holes defined in the bar, the resin melt passage holes being capable of communicating with each of the divided passages and extending as orthogonally intersecting the axis of the bar; and a breaker plate having a multiplicity of through holes and attached to the resin flow-out side of the screen, wherein each of the resin melt passage holes are configured square in section at least on the resin flow-in side thereof, and the screen and the breaker plate, which are configured square, are disposed on the resin flow-in side of each of the resin melt passage holes.
  • the breaker plate or each of the resin melt passage holes of the screen holding bar be provided therein with a scaling wall.
  • the other screen holding bar is slid to expose the screen thereof and to close the other divided passage.
  • the soiled screen mesh of the thus exposed screen is changed for a new one while the resin melt is allowed to pass through the other screen previously changed.
  • the screen holding bar of interest is slid in the opposite direction to return the screen thereof into the divided passage to permit resin melt to pass therethrough.
  • a sealing wall in the breaker plate or in each of the resin passage holes along with the breaker plate in square configuration prevents resin melt from flowing out of the screen changer and makes it possible to shorten a sealing portion between the changer body and the screen holding bars, thereby reducing the size of the changer body, assuring the screen changer worked with improved precision, and reducing the working cost.
  • FIG. 1 illustrates a first embodiment of a filter member according to the present invention, in which FIG. 1 (A) is a sectional view of an extruder, and FIG. 1 (B) is a front elevation of a breaker plate;
  • FIG. 2 illustrates a second embodiment of a filter member according to the present invention, in which FIG. 2 (A) is a front elevation thereof, and FIG. 2 (B) is a sectional view thereof;
  • FIG. 3 illustrates a third embodiment of a filter member according to the present invention, in which FIG. 3 (A) is a front elevation of a first plate.
  • FIG. 3 (B) is a sectional view of the filter member, and
  • FIG. 3 (C) is a front elevation of a second plate;
  • FIG. 4 illustrates a fourth embodiment of a filter member according to the present invention, in which FIG. 4 (A) is a front elevation of a first plate.
  • FIG. 4 (B) is a sectional view of the filter member, and
  • FIG. 4 (C) is a front elevation of a second plate;
  • FIG. 5 illustrates a fifth embodiment of a filter member according to the present invention, in which FIG. 5 (A) is a front elevation of a first plate.
  • FIG. 5 (B) is a sectional view of the filter member, and
  • FIG. 5 (C) is a front elevation of a second plate;
  • FIG. 6 is a sectional view of an extruder incorporating a filter member having a convex surface according to an embodiment of the present invention
  • FIG. 7 is a sectional view taken along line A—A of FIG. 6;
  • FIG. 8 is a sectional view of an extruder incorporating a filter member having a concave surface according to an embodiment of the present invention
  • FIG. 9 is an enlarged sectional view, taken along line A—A of FIG. 10, showing a first embodiment of a screen changer according to the present invention.
  • FIG. 10 is a partially cut-away front elevational view of the embodiment
  • FIG. 11 is a partially cut-away plan view of FIG. 10;
  • FIG. 12 is an enlarged perspective view showing a screen of the embodiment
  • FIG. 13 is an explanatory view for illustrating a screen changing procedure in respect of a screen changer according to the present invention.
  • FIG. 14 is a sectional view showing a principal portion of a second embodiment of a screen changer according to the present invention (corresponding to a sectional view taken along line A—A of FIG. 10 );
  • FIG. 15 is a partially cut-away elevational view showing another embodiment of a screen changer according to the present invention.
  • FIG. 16 is an enlarged sectional view taken along line B—B of FIG. 15;
  • FIG. 17 is a sectional view showing a variation of the above embodiment of a screen changer, corresponding to a sectional view taken along line C—C of FIG. 15;
  • FIG. 18 is a comparative explanatory view of the above variation (corresponding to the sectional view taken along line C—C of FIG. 15 );
  • FIG. 19 is a partially cut-away elevational view showing another variation of the above embodiment.
  • FIG. 20 is a sectional view taken along line D—D of FIG. 19;
  • FIG. 21 is a sectional view showing a conventional screen changer 60 .
  • FIG. 22 is a sectional view showing a conventional screen changer 70 .
  • an extruder 1 (hereby meant to include a kneader and a molding machine) for extruding a resin material such as a polyolefin or a compound comprises an elongated cylindrical barrel 2 and a screw 3 inserted into the barrel 2 which, by its rotation, causes the resin material to flow in the direction indicated by an arrow T and extrudes it into a molding die (not shown) or the like.
  • a filter device 4 including a first body 5 defining a passage 5 A, a second body 6 defining a passage 6 A which are mated together at their mating surfaces 7 and fastened with a plurality of bolts 8 , and a filter member 9 disposed in the passage 6 A of the second body 6 .
  • the filter member 9 comprises, in combination, a screen 10 made of a mesh material for filtering off the impurities of the resin material, and a breaker plate 11 attached to the rear side of the screen 10 for backing up the same.
  • the screen 10 includes a plurality of mesh material layers superposed one on another.
  • the breaker plate 11 has a multiplicity of resin passageways 12 in a passageway defining face 13 shaped circular.
  • the passageways are in the form of elongated slits 14 extending as intersecting the resin flow direction T. Rib portions 15 separating the slits 14 from each other ensure sufficient back-up capability even when they are formed very thin and this allows the resin passageways to have a ratio of opening of 70 to 80% relative to the passageway defining face 13 .
  • FIGS. 2 (A) and 2 (B) show the second embodiment of a filter member according to the present invention.
  • those of the second embodiment are shaped rectangular. By shaping them rectangular it is possible to increase the effective filtering area as compared with the circular configuration.
  • FIGS. 3 (A), 3 (B) and 3 (C) show the third embodiment of a filter member according to the present invention in which breaker plate 11 attached to the rear side of screen 10 includes a first plate 111 and a second plate 211 which are mated together and assembled by means of a bolt 16 .
  • Slits 214 of the second plate 211 are made wider than slits 114 of the first plate 111 , the slits 114 and 214 extending as intersecting each other.
  • the width relation between the slits 114 and 214 may be converse to that shown in the drawings; i.e., the slits 114 may be made wider than the slits 214 .
  • FIGS. 4 (A), 4 (B) and 4 (C) show the fourth embodiment of a filter member according to the present invention which is basically the same as the third embodiment in arrangement.
  • the fourth embodiment differs from the third embodiment in that, in contrast to the screen 10 and breaker plate 11 shaped circular in the third embodiment, those in the fourth embodiment are shaped rectangular to ensure a larger effective filtering area.
  • like reference characters designate corresponding parts throughout the third and fourth embodiments.
  • the third and fourth embodiments ensure a low pressure loss property by making the slits 214 of the second plate 211 wider than the slits 114 of the first plate 111 .
  • FIGS. 5 (A), 5 (B) and 5 (C) show the fifth embodiment of a filter member according to the present invention in which breaker plate 11 attached to the rear side of screen 10 includes first plate 111 and second plate 211 which are mated together and assembled by means of bolt 16 .
  • the first plate 111 defines slits 114
  • the second plate 211 defines circular holes 314 , whereby the breaker plate 11 enjoys a low pressure loss property.
  • the circular holes have different sizes and are arranged in rows parallel to the sides of the plate.
  • the slits 114 of the first plate 111 centrally have a partition wall 414 which is recessed on both the front side and rear side thereof to increase the net filtering area of the screen 10 and to ensure an sufficient passage area between the first plate 111 and the second plate 211 .
  • FIGS. 5 (A), 5 (B) and 5 (C) are shaped rectangular, these may be shaped circular. Also, the partition wall 414 may be recessed on either one of the front and rear sides thereof.
  • FIGS. 6 and 7 show an embodiment with a screen change function wherein second body 6 defines a circular bore 6 B extending as intersecting the extrusion direction into which is fitted a slide member 6 C provided with a pair of juxtaposed filter members 9 according to any one of the foregoing embodiments so that the pair of filter members 9 are alternately usable by means of cylinder 6 D.
  • any one of the first to fifth embodiments as the filter members 9 of the embodiment shown in FIGS. 6 and 7, the provision of screen 10 and breaker plate 11 respectively having convex curved surfaces of a single curvature makes it possible to provide a further increased filtering area as compared with the flat-type ones.
  • the convex curved surfaces may be protruded in either the opposite direction of the extrusion direction as shown in FIGS. 6 and 7 or the extrusion direction as shown in FIG. 8 .
  • the filter member according to the present invention it is possible to increase the ratio of opening of resin passageways in the breaker plate without any deterioration in the screen back-up capability and hence increase the effective filtering area within a limited area.
  • FIGS. 9 to 13 show a first embodiment of a screen changer according to the present invention and wherein screen changer 20 is disposed intermediate between a resin melt outlet 21 A of a plastic molding machine, or specifically an extruder 21 and a resin melt inlet 22 A of a mold 22 .
  • the screen changer 20 includes a changer body 23 shaped rectangular parallelepiped, screens 24 , screen holding bars 25 and 26 , cylinder mounting members 27 and supporting rods 28 which are secured to the changer body 23 , and cylinders 29 and 30 as means for slidably driving the bars 25 and 26 .
  • the screens 24 each comprise a bottomed cylindrical strainer 31 made of a plate having a multiplicity of perforations 314 , a bottomed cylindrical screen mesh 32 fitted in the strainer 31 , and a mesh set ring 33 . This arrangement requires a change of only the screen mesh 32 for a new one.
  • the resin passage is divided into two juxtaposed passages 35 and 36 in the middle of the resin passage from resin melt inlet 33 to resin melt outlet 34 ; screen holding bar receiving bores 37 and 38 extend through the divided passages 35 and 36 , respectively, in a direction intersecting the divided passages 35 and 36 ; and the aforementioned screen holding bars 25 and 26 are slidably inserted through the corresponding receiving bores 37 and 38 .
  • the screen holding bars 25 and 26 are each in the form of a log and about twice as long as the length of each of the screen holding bar receiving bores 37 and 38 .
  • In respective forward end portions of the screen holding bars 25 and 26 are defined pairs of resin melt passage holes 39 and 40 , and 41 and 42 , each pair of resin melt passage holes being located adjacent to each other and extending as intersecting the axis of each of the bars 25 and 26 .
  • Screens 24 A, 24 B, 24 C and 24 D are removably fitted in the passage holes 39 to 42 , respectively, which holes are capable of communicating with the corresponding divided passages 35 and 36 .
  • the screens 24 A and 24 B are to be first changed for new ones by, as shown in FIG. 13 (II), actuating the upper cylinder 29 (or one cylinder) to advance the screen holding bar 25 thereby exposing the screens 24 A and 24 B from the changer body 23 while closing the upper divided passage 35 with the bar base portion 25 A.
  • resin melt passes through the lower divided passage 36 (or the other divided passage) and screens 24 C and 24 D and is fed to the inlet 22 A of the mold 22 without any interruption.
  • respective set rings 33 of the screens 24 A and 24 B thus exposed are removed from the corresponding strainers 31 , and then only the soiled screen meshes 32 are removed from the strainers 31 .
  • new screen meshes 32 are fitted into the respective strainers 31 , and the set rings 33 are attached to the strainers 31 to fix the screen meshes 32 .
  • the upper screen holding bar 25 is retracted by means of the cylinder 29 , so that the condition shown in FIG. 13 (III) is assumed.
  • the lower cylinder 30 (or the other cylinder) is actuated to advance the screen holding bar 26 thereby exposing the screens 24 C and 24 D from the changer body 23 while closing the lower divided passage 36 with the bar base portion 26 A.
  • resin melt passes through the upper divided passage 35 (or one divided passage) and screens 24 A and 24 B and is fed to the inlet 22 A of the mold 22 without any interruption.
  • the screen holding bars 25 and 26 respectively have the pairs of resin passage holes 39 to 42 to which the corresponding screens 24 are attached and, hence, it is possible to significantly increase the filtering area for resin melt and reduce the pressure loss. Moreover, such an arrangement permits the screen meshes 32 themselves to be readily changed without any interruption of the resin melt flow, thereby shortening the time required for screen changing operations and improving the operability. Additionally, since the screen meshes 32 can be changed without the need of removing the strainers 31 , the removal and cleaning of the strainers 31 can be dispensed with, resulting in elimination of the time and labor therefor.
  • FIG. 14 shows the principal part of the second embodiment of a screen changer according to the present invention.
  • the second embodiment differs from the first embodiment in that screens 24 are disposed in respective passages 39 to 42 as facing opposite the resin melt flow and each fitted over the corresponding strainer 31 .
  • the second embodiment requires a change of only the screen meshes 32 in the same manner as the first embodiment and ensures functions and effects comparable to those of the first embodiment. Therefore, like reference characters are given to corresponding parts throughout FIGS. 9 and 14 so as to omit description thereof. With the above second embodiment, it is required in changing the screen meshes 32 to merely remove resin adhering to the outside of the screen meshes 32 , and this provides for improved operability as compared with the first embodiment since the amount of resin to be removed is relatively small.
  • FIGS. 15 and 16 show another embodiment of screen changer 20 according to the present invention.
  • the subject embodiment is disposed intermediate between the resin melt outlet 21 A of extruder 21 and the resin melt inlet 22 A of mold 22 .
  • parts of the screen changer 20 corresponding to those of the first embodiment are denoted by like reference characters throughout FIGS. 9-13 and FIGS. 15 and 16 so as to omit description thereof.
  • the screen holding bars 25 and 26 of the screen changer 20 have resin melt passage holes 43 and 44 , respectively, which are shaped square in section at resin flow-in sides 43 A and 44 A thereof and circular in section at resin flow-out sides 43 B and 44 B thereof.
  • the sectional areas of the resin flow-in sides 43 A and 44 A are made sufficiently larger than those of the resin flow-out sides 43 B and 44 B.
  • a square breaker plate 45 having multiple perforations and a sectional area generally equal to the sectional area of each of the resin flow-in sides 43 A and 44 A.
  • a square screen 46 is changeably disposed upstream of the breaker plate 45 .
  • the breaker plate 45 thus shaped square offers a significantly increased resin filtering area while reducing the pressure loss as compared with a circular breaker plate depicted by double-dotted broken line R in FIG. 15, provided that these breaker plates are used in screen holding bars of equal diameter.
  • this embodiment requires an easy change of only the screen 46 without any interruption of the resin melt flow.
  • seal sleeve 48 of a relatively short length causes resin melt to flow out of the passage holes 43 , 44 to the exterior as indicated by S 1 when the screen holding bars 25 , 26 are slid in the direction indicated by arrow S for screen changing.
  • seal sleeve 48 is required to be sufficiently long.
  • the seating wall 47 as shown in FIG. 17, however, even when the resin flow-in side 43 A of the passage hole is in communication with the divided passage 35 , resin melt is blocked by the sealing wall 47 as soon as the seating wall 47 leaves the divided passage 35 whereby the resin melt never flows out of the changer body 23 .
  • sealing wall 47 which is otherwise provided to the breaker plate 45 , in the center of each of the resin passage holes 43 , 44 of the screen holding bars in such a manner that each resin passage hole is divided into two.
  • the sealing wall 47 is formed integrally with each of the bars 25 , 26 and each half of the passage hole thus divided is provided with breaker plate 45 and screen 46 so that only the screen 46 can be changed.
  • the respective resin passage holes 43 , 44 of the screen holding bars 25 , 26 may each comprise a pair of resin passage holes. Such a changer can be operated in the same manner as the first embodiment. Furthermore, in the first and second embodiments the screen holding bars 25 , 26 may each define only one resin passage hole and each have only one screen if the extruder of interest requires only a small filtering area.
  • the screen changer of the present invention enables an efficient change of the screen for a new one with improved operability and without any interruption of resin melt flow since only the screen mesh is required to be changed. Moreover, the screen changer allows for easy cleaning and enjoys an increased filtering area for resin melt with the pressure loss alleviated.
  • the provision of the sealing wall in the breaker plate or the resin passage hole of the screen holding bar makes it possible to shorten the sealing portion needed between the changer body and the screen holding bar thereby to reduce the size of the changer body. This leads to the screen changer having improved working precision and requiring reduced working cost.
  • the present invention is useful in filtering off impurities in apparatus for extruding resin materials such as kneaders and molding machines and provides for high practicality since a filter member can be assuredly changed when occluded with the impurities.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
US09/579,438 1994-07-01 1995-06-28 Filter member and screen changer for use in resin extruder Expired - Lifetime USRE37681E1 (en)

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Application Number Priority Date Filing Date Title
US09/579,438 USRE37681E1 (en) 1994-07-01 1995-06-28 Filter member and screen changer for use in resin extruder

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
JP6151243A JP2892282B2 (ja) 1994-07-01 1994-07-01 樹脂押出機の濾過体
JP6-151243 1994-07-01
JP6-152496 1994-07-04
JP6152496A JP2778914B2 (ja) 1994-07-04 1994-07-04 樹脂成形機におけるスクリーン交換装置
US09/579,438 USRE37681E1 (en) 1994-07-01 1995-06-28 Filter member and screen changer for use in resin extruder
PCT/JP1995/001283 WO1996001178A1 (en) 1994-07-01 1995-06-28 Filter medium for resin extruders and screen exchanger for resin extruders
US08/600,930 US5756129A (en) 1994-07-01 1995-06-28 Filter member and screen changer for use in resin extruder

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Application Number Title Priority Date Filing Date
US08/600,930 Reissue US5756129A (en) 1994-07-01 1995-06-28 Filter member and screen changer for use in resin extruder

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USRE37681E1 true USRE37681E1 (en) 2002-04-30

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US09/579,438 Expired - Lifetime USRE37681E1 (en) 1994-07-01 1995-06-28 Filter member and screen changer for use in resin extruder
US08/600,930 Ceased US5756129A (en) 1994-07-01 1995-06-28 Filter member and screen changer for use in resin extruder

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US (2) USRE37681E1 (OSRAM)
EP (2) EP0744271B1 (OSRAM)
DE (2) DE69524210T2 (OSRAM)
WO (1) WO1996001178A1 (OSRAM)

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US20040200784A1 (en) * 2003-04-10 2004-10-14 Psi-Polymer Systems Inc. Filtration apparatus for polymer processing and method
KR20180028494A (ko) * 2015-07-16 2018-03-16 니혼 스핀들 세이조 가부시키가이샤 스트레이닝 기구 및 그 스트레이닝 기구를 구비한 스크루 압출기
US20210162324A1 (en) * 2016-10-17 2021-06-03 Next Generation Analytics Gmbh Filter system for viscous or highly viscous liquids, in particular plastic melts and method for filtering viscous or highly viscous liquids
US11260570B2 (en) * 2018-05-07 2022-03-01 PSI-Polymer Systems, Inc. Filtration apparatuses and screen changer devices for polymer processing and related methods

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DE19844366A1 (de) * 1997-10-01 1999-04-22 Wil Man Polymer Filtration Gmb Fluidfiltervorrichtung
AT411161B (de) * 1999-09-22 2003-10-27 Bacher Helmut Verfahren und vorrichtung zum recyclen von pet-gut
DE10234229B4 (de) * 2002-07-27 2005-09-01 Berstorff Gmbh Granuliervorrichtung
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DE102012104939A1 (de) * 2012-06-06 2013-12-12 Kreyenborg Verwaltungen Und Beteiligungen Gmbh & Co. Kg Filtriervorrichtung für Fluide
DE102016113979B3 (de) * 2016-07-28 2017-11-23 Gneuss Gmbh Filtriervorrichtung für eine Kunststoffschmelze oder ein anderes hochviskoses Fluid
US11724431B2 (en) * 2019-02-08 2023-08-15 PSI-Polymer Systems, Inc. Modular fluid processing apparatuses, modular components and related methods
US20220355530A1 (en) * 2021-05-05 2022-11-10 Yih Sin Liu Non-continuous rotation backwashing filter apparatus for rubber/plastic extrusion/injection machine

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US4755290A (en) * 1986-11-13 1988-07-05 Neuman Clayton L Apparatus for continuously filtering plastic melt with noninterruptive purge
JPS6448221A (en) * 1987-08-19 1989-02-22 Showa Denko Kk Magnetic disk and its production
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040200784A1 (en) * 2003-04-10 2004-10-14 Psi-Polymer Systems Inc. Filtration apparatus for polymer processing and method
US7147774B2 (en) * 2003-04-10 2006-12-12 Polymer Systems, Inc. Sliding plate filter with segmented sealing ring
KR20180028494A (ko) * 2015-07-16 2018-03-16 니혼 스핀들 세이조 가부시키가이샤 스트레이닝 기구 및 그 스트레이닝 기구를 구비한 스크루 압출기
US20210162324A1 (en) * 2016-10-17 2021-06-03 Next Generation Analytics Gmbh Filter system for viscous or highly viscous liquids, in particular plastic melts and method for filtering viscous or highly viscous liquids
US11260570B2 (en) * 2018-05-07 2022-03-01 PSI-Polymer Systems, Inc. Filtration apparatuses and screen changer devices for polymer processing and related methods
US20220355531A1 (en) * 2018-05-07 2022-11-10 PSI-Polymer Systems, Inc. Filtration apparatuses and screen changer devices for polymer processing and related methods
US12214536B2 (en) * 2018-05-07 2025-02-04 PSI-Polymer Systems, Inc. Filtration apparatuses and screen changer devices for polymer processing and related methods

Also Published As

Publication number Publication date
DE69534435D1 (de) 2005-10-13
EP0744271B1 (en) 2001-11-28
EP0744271A1 (en) 1996-11-27
DE69524210T2 (de) 2002-06-27
EP1125713A3 (en) 2001-11-21
EP0744271A4 (OSRAM) 1996-12-04
EP1125713A2 (en) 2001-08-22
EP1125713B1 (en) 2005-09-07
DE69534435T2 (de) 2006-06-14
DE69524210D1 (de) 2002-01-10
WO1996001178A1 (en) 1996-01-18
US5756129A (en) 1998-05-26

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