EP0408704A1 - Arrangement for applying substances to a web of material. - Google Patents
Arrangement for applying substances to a web of material.Info
- Publication number
- EP0408704A1 EP0408704A1 EP90901724A EP90901724A EP0408704A1 EP 0408704 A1 EP0408704 A1 EP 0408704A1 EP 90901724 A EP90901724 A EP 90901724A EP 90901724 A EP90901724 A EP 90901724A EP 0408704 A1 EP0408704 A1 EP 0408704A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- arrangement according
- doctor
- gekenn
- application
- working
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F15/00—Screen printers
- B41F15/14—Details
- B41F15/40—Inking units
- B41F15/42—Inking units comprising squeegees or doctors
- B41F15/426—Inking units comprising squeegees or doctors the squeegees or doctors being magnetically attracted
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F15/00—Screen printers
- B41F15/14—Details
- B41F15/44—Squeegees or doctors
- B41F15/46—Squeegees or doctors with two or more operative parts
Definitions
- the invention relates to an arrangement for applying substances to web-shaped material, a doctor blade being magnetically pressed against the material or a template by means of a working magnet and being in contact with a profiled strip in the working position. It is already known to arrange a magnetic table or a magnetic roller opposite a doctor blade roller, which presses the roller doctor blade made of magnetizable material against the web or a stencil and, in the event of further movement of the stencil or the product web, in front of the roller doctor blade brings lying material into the web.
- a support strip behind the roll doctor In order to prevent the roll doctor from migrating, it has also already been proposed to arrange a support strip behind the roll doctor; this is of particular interest in the case of small-diameter roller skates, since this can prevent the substance to be applied from flowing over the upper area of the roller doctor and thus also reaching the web behind the roller doctor.
- a so-called ink jam bar seen in the direction of movement of the material web, is arranged in front of the roller squeegee and this ink jam bar is influenced depending on the dimension and location, i.e. Distance to the application level, the application process.
- a disadvantage of this prior art is that in the event of an interruption in operation, the doctor element and the profiled strip have to be handled separately, which requires a greater amount of work and that there is a risk when using doctor rollers, in which the ratio between diameter and length is very large that the doctor blades are bent and then can no longer be used.
- the invention now seeks to eliminate this disadvantage of the prior art and to create an arrangement which can be handled as a functional unit and in which the risk of bending doctor blades with a small diameter is largely avoided.
- the invention is characterized in that min- at least one holding magnet is arranged, which holds the doctor blade on the professional bar in a rolling or sliding manner when the working magnet is switched off and lifts it off the application surface or template.
- the invention has made it possible to handle doctor element and professional bar as a functional unit. Furthermore, it is no longer necessary to either interrupt the stencil movement in the event of a production interruption or to remove the doctor elements from the stencils, but rather by lifting the squeegee element when production is interrupted, the templates can be rotated further without this having negative consequences.
- the ProfiUeiste and thus the squeegee element self-position and it is now possible to use the most varied types of squeegee elements and also optionally to work with roller squeegees of the most varied diameters.
- FIGS. 1 and 2 show two exemplary embodiments of the device according to the invention. 3 shows a detail, in particular of the embodiment according to FIG. 1.
- FIGS. And 5 to 8 are further embodiments of the invention, as are FIGS. 9 to 14.
- a professional bar 6 is pivotably arranged above a flat magnetic table 2, over which a material web 4 is guided in the direction of movement 3.
- a magnetic holding bar 7 or, if appropriate, a plurality of holding magnets arranged in series are used.
- the magnetic holding bar 7 or the row of holding magnets are preferably completely surrounded by the material of the profile bar 6.
- the ProfiUeiste 6 is fastened to a tube 10 designed as a material feed and the pivoting can take place about the axis 12 of the tube.
- the professional bar 6 ends in front of a template 5 or at a distance from the web 4.
- the magnetic bar 7 comes into operation 5 and the doctor blade 9 is lifted off the template 5 or web 4 and, in this raised state, is held on the surface 8 by the magnetic bar 7 on the surface 8, ie Doctor roller 9 is pressed against the surface 8 both in the operating state (solid lines) and in the switched-off state (drawn in broken lines), regardless of the size of the diameter of the doctor blade, so that this diameter can be selected down to 3 mm .
- a doctor element 13 is also provided on the rear side 11 in the direction of movement 3, so that the device can also be used as a storage or sealing strip. Because the ProfiUeiste 6 is pivotable, the substance jamming angle in front of the doctor roller 9 and thus the order result can be changed during the operating state.
- a stop bracket 16 may also be present. This is indicated by dashed lines in FIG. 1, whereas FIG. 3 shows such an embodiment in more detail.
- the end part of the professional bar 6 is designed as a nose 17 and provided with a curve.
- FIG. 2 it is possible to additionally press in the substance applied with the roller 9 with the roller 13 or, if the roller 13 is designed as a coating rod similar to FIG. 4 or 8, to spread.
- FIG. 4 shows a further advantageous arrangement that is made possible by the present invention. This is because the invention makes it possible to also use non-rotating, round and / or differently profiled, bend-sensitive doctor elements, which opens up new possibilities for application technology. According to the prior art, it was impossible to loosely insert and use coating sticks.
- a support 18 is attached to the professional bar 6. This attachment can be carried out mechanically, for example by means of a screw , or else by means of the holding magnet 7.
- a rod 19 is inserted in the carrier 18, which carries the actual doctor element 9 in a rotationally fixed but movable manner in the vertical direction squeegee element that can be agnetisable material is pulled down and pressed against the web 4 or the stencil 5. When the operation is switched off, the magnetic holding bar lifts the doctor element 9 into the dashed, ie lifted, position.
- the stopping of round bars, which is prevented from rotating, is an inventive measure which has a surprising effect.
- the stopping of the roll that is to say the functional conversion of a doctor blade into a coating rod, results in a measurable change in the application quantity, depending on the substance, so that the technologically high-quality doctor blade application technique is thereby even more flexible and varied in its applicability, without this a significant cost arises.
- Another possibility is to connect a round professional bar, preferably with a very small diameter, in a rotationally fixed manner to a professional bar with a rectangular cross section, which is loosely arranged in a holder and secured against tipping. 5 shows a further embodiment.
- a profile body 20 is also attached to the profile bar 6.
- This carries a doctor blade 21 which is pressed against the template 5 or the web 4.
- a groove 22 is present in the profile body 20, which forms the receiving space for a doctor roller 9.
- the substance is introduced into this space via openings 23.
- the application quantity and quality can be controlled by the doctor blade 21 made of steel or plastic.
- This device is particularly advantageous for low-viscosity substances and for small quantities.
- the exit slot is designated 24.
- FIG. Another embodiment is shown in FIG.
- two magnetic strips or rows of magnetic magnets 7 and 25 are present.
- a doctor element 13 can also be held in a groove 26 on the rear side 11 of the professional bar 6.
- the individual holding magnets can be made narrower than in the embodiments of FIGS. 1 and 2 and thus can be seen closer to the corresponding contact surfaces 8 and 11, respectively. This makes the magnets work better.
- the contact surfaces in the contact area of the doctor element 9 or 13 to be curved.
- in addition to the main feed 27 there is also a width distribution pipe 28. which is fed in the middle and releases the substance via the outlets 14. When dismantling, the ProfiUeiste is pivoted through 180 ° so that substance residues can then flow into the channel 29.
- Figure 7 is another embodiment of the invention.
- a recess 31 is incorporated in the professional bar 6, in which a doctor blade 13 is also located.
- the holding magnet 7 between the recess 31 and the front surface 8 causes both the squeegee on the surface 8 and the squeegee in the recess 31 to be pressed against the respective adjacent surface when the working magnet is switched off and to be pressed away from the stencil 5 or the web 4 is lifted off.
- the recess 31 can also be designed like a plain bearing.
- a second holding magnet 30 can also be present above the recess 31, which then additionally acts on the doctor blade 13.
- FIG 8 shows an embodiment in which the professional bar 6 is provided with an additional bar 33 which carries a blade 34 at its lower end and thus delimits a color space 32.
- a rotationally fixed rod doctor blade 35 is provided in the color space.
- the lower surface 36 of the profile bar 6 can be used as a storage surface. This can be seen particularly clearly in FIG. 3. A pressure is exerted on the material to be applied located in the space between the storage surface 36 and the template 5 or the web 4, which supports the application process. The effect of the storage surface 36 becomes stronger the closer the professional bar 6 is placed in relation to the application surface or stencil. Due to the pivotability of the profile bar 6, the substance dust angle in front of the doctor element, i.e. the area 36 and thus the application result can be changed, since the pressure exerted on the material can be controlled by this substance jam angle and thus the amount of material applied per unit area can be controlled.
- the magnet in the magnetic table 2 can act on the doctor elements 9 and 13 on both sides of the profile bar 6 and it is then possible to use the doctor elements 9 and 13 on both sides of the profile bar 6 to keep in work or rest position.
- the invention also has the advantage that the stencils can be rotated further by lifting the squeegee when production is interrupted.
- the professional tool 6 and thus the squeegee occur. You can choose to work with doctor blades of various diameters and cleaning and handling is practically the same as with a "one-piece" device.
- Fig. 9 shows one. Overall cross section through an application device 1 according to the invention in a simple embodiment constructed with few components.
- a stable cross member or support bar 42 with a rectangular cross-section is mounted on both sides of the machine and can also be pivoted if necessary.
- two profile strips 43 and 44 which are designed to be as rigid as possible, are connected to the cross member 42 by, for example, screw connections 45 to the cross member 42 to form a bar-shaped U-beam which is open with respect to the application surface 4.
- screw connections 45 to the cross member 42 to form a bar-shaped U-beam which is open with respect to the application surface 4.
- a stowage profile 6 which is height-adjustable by means of adjusting devices 57, which are arranged, for example, in FIG. and sealing strip can be formed - arranged such that their surface 49 lying against the profile strip 43 lies sealingly against the sealing surface area 50 of the professional strip 43.
- the bar 44 is a professional bar designed over the full working width, then the surface 51 of the substance resting on the professional bar 44 of the substance on the baffle bar or stowage and sealing profile 6 can also be made sealing, since it is conceivable that application substance could rise along surface 51 at high web or application speed.
- the direction of movement of the web 4 is shown by an arrow 3. However, it is also possible for the web 4 "to be fixed and for the entire application device 1 to be moved in the direction 3 opposite the surface to be applied.
- the area in front of the application device which is connected to the application substance 41 has the reference number 45 when used with the doctor roller 9 of the small diameter shown in FIG. 9 and the roller 13 with the large diameter shown in broken lines in FIG the reference number 47 marked.
- the area assigned to the above-described examples after the doctor element or its contact line or zone on the application surface is identified by 48 and 48 '.
- doctor element 9 has a narrow free movement space 52 and a relatively wide substance storage area 36 and that the wider doctor element or the roller 13 has a free movement space 52 which is chosen in accordance with its dimensions and a narrower, but therefore is allocated closer or more effectively to the application area sufficient storage area 36.
- Fig. 10 shows that the doctor element pressed by means of magnetic force is not necessarily a doctor blade, but e.g. can also be a profiled scraper strip 40 with an approximately rectangular or trapezoidal cross-section, which is to be regarded as a doctor element with the same function or in accordance with the invention both in terms of magnetically acting contact pressure and in terms of its sealing contact with the sealing region 50 of the strip 43.
- the height adjustment possibility of the professional bars 6, which is again shown in FIG. 10, is functionally the same, as shown in FIG. 9 and also in the other figures.
- the profiled scraper bar 40 shown in Fig. 10 is cut several times over its entire length corresponding to the application width in the area 40a, so that only the hatched part 40b of the professional bar 40 facing the application area and provided with the squeegee profile is undivided, i.e. Solid throughout the entire length of the profile, remains.
- This measure according to the invention makes it possible to eliminate any bending or risk of bending that impairs the uniformity of application due to excessive inherent rigidity.
- FIG. 11 shows a detail from FIG. 9 with the greater freedom of movement 52 for the doctor element. 11 shows a doctor blade roller whose diameter is greater than 14 and less than 16.
- doctor element depending on Machine setting - or setting of the application device which is the responsibility of the user - can rest either on the contact and sealing area 50 of the bar 43 or on the opposite surface 39 of the bar 6.
- This surface 39 can thus also be designed as a contact and sealing strip, like the area 50 of the strip 43.
- a profile bar 35 with a circular cross section - thus equal to a doctor roller - is shown as the doctor element.
- This round profile coating rod 35 is, however, secured against rotation by means of a plug connection 37 on a professional bar 38.
- the strip 38 - which can optionally be made of magnetizable material - is connected to a strip 53 which fills the free movement space 52 up to the surface 54, so that the professional squeegee strip extended by the above-described additional strips - which in this cross-sectional shape is of course only or could be made in two parts - on this surface 54 sliding and optionally also sealing or additionally sealing.
- FIG. 13 shows a doctor blade profile strip 20 which is provided with a flexurally elastic coating edge 34 which can thus be deformed depending on the doctor pressure.
- a permanent magnetic bar 7 or, with the same function, a series of holding magnets arranged side by side was inserted into the bar 43. This measure, which favors handling, has the effect that the bar 20 is magnetically attached to the surface 50 outside the operating state.
- the strip 20 cannot fall out during installation and removal and during transport of the device; the application auxiliary device and the doctor element can be handled together as a one-piece device by this measure.
- FIG. 14 shows a combination of the representations of FIGS. 1U and FIG. 13.
- a doctor blade roller of small diameter is inserted, which - denoted by 9 - shows the application operating state and - denoted by 9 '- the magnetically attached from the application level or template Position 9 'shows.
- the magnet arrangement is similar or similar or at least functionally the same as in bar 43 in bar 6 is also possible.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Coating Apparatus (AREA)
- Treatment Of Fiber Materials (AREA)
- Paper (AREA)
- Unwinding Webs (AREA)
- Seal Device For Vehicle (AREA)
- Machines For Laying And Maintaining Railways (AREA)
- Packaging Of Annular Or Rod-Shaped Articles, Wearing Apparel, Cassettes, Or The Like (AREA)
Abstract
Description
Claims
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT33/89 | 1989-01-09 | ||
AT3389A AT392925B (en) | 1989-01-09 | 1989-01-09 | Applicator machine or device for the coating, impregnation or patterning of web-like material |
AT2112/89 | 1989-09-08 | ||
AT211289A AT392746B (en) | 1989-09-08 | 1989-09-08 | Arrangement for applying substances to web-like material |
PCT/AT1990/000002 WO1990007387A2 (en) | 1989-01-09 | 1990-01-05 | Arrangement for applying substances to a web of material |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0408704A1 true EP0408704A1 (en) | 1991-01-23 |
EP0408704B1 EP0408704B1 (en) | 1993-06-16 |
EP0408704B2 EP0408704B2 (en) | 1998-07-15 |
Family
ID=25591186
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90901724A Expired - Lifetime EP0408704B2 (en) | 1989-01-09 | 1990-01-05 | Arrangement for applying substances to a web of material |
Country Status (9)
Country | Link |
---|---|
US (1) | US5151132A (en) |
EP (1) | EP0408704B2 (en) |
AT (1) | ATE90595T1 (en) |
BR (1) | BR9004513A (en) |
CZ (1) | CZ280958B6 (en) |
DD (2) | DD291508A5 (en) |
DE (2) | DE59001764D1 (en) |
ES (1) | ES2041524T5 (en) |
WO (1) | WO1990007387A2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2259262A (en) * | 1991-09-03 | 1993-03-10 | Univ Hull | Blade control system |
NL1011992C2 (en) | 1999-05-07 | 2000-11-09 | Stork Brabant Bv | Squeegee. |
CN113140403A (en) * | 2021-04-23 | 2021-07-20 | 黄奕展 | Neodymium iron boron production is with sizing machine convenient to arrangement |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE59106731D1 (en) * | 1991-03-21 | 1995-11-23 | Johannes Zimmer | Squeegee. |
DE9103570U1 (en) * | 1991-03-21 | 1992-07-23 | Zimmer, Johannes, Klagenfurt, Kärnten | Squeegee device |
DE9103571U1 (en) * | 1991-03-21 | 1992-07-23 | Zimmer, Johannes, Klagenfurt, Kärnten | Squeegee device |
JP3345653B2 (en) * | 1993-05-12 | 2002-11-18 | 谷電機工業株式会社 | Screen plate cleaning device |
NL9301820A (en) * | 1993-10-20 | 1995-05-16 | Stork Screens Bv | Squeegee assembly. |
DE29517098U1 (en) * | 1995-10-17 | 1997-02-13 | Zimmer, Johannes, Klagenfurt | Application device |
US5925187A (en) * | 1996-02-08 | 1999-07-20 | Speedline Technologies, Inc. | Apparatus for dispensing flowable material |
US5938106A (en) * | 1996-08-01 | 1999-08-17 | International Business Machines Corporation | Method and apparatus for applying solder and forming solder balls on a substrate |
US6066206A (en) * | 1997-02-21 | 2000-05-23 | Speedline Technologies, Inc. | Dual track stenciling system with solder gathering head |
DE19735026C1 (en) * | 1997-08-13 | 1999-05-27 | Freudenberg Carl Fa | Device for coating a material web with a paste |
JP4365479B2 (en) * | 1999-05-18 | 2009-11-18 | 東北リコー株式会社 | Stencil printing machine |
US20090308270A1 (en) * | 2006-08-29 | 2009-12-17 | Daetwyler Swisstec Ag | Doctor blade |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2437006A1 (en) † | 1974-08-01 | 1976-02-19 | Zimmer Johannes | Magnetic roller system with variable contact pressure - has magnetisable counter rollers acting on circumference of magnetic roller |
NL155759B (en) † | 1967-05-26 | 1978-02-15 | Zimmer Johannes | DEVICE FOR CYLINDER TEMPLATES WITH A ROLLABLE MAGNETIZABLE MATERIAL CONTAINING DIPPER OVER THE INNER WALL OF THE TEMPLATE. |
DE3416029A1 (en) † | 1983-05-24 | 1984-11-29 | Zimmer, Johannes, Klagenfurt, Kärnten | Squeegee device for flat stencils with two squeegee strips arranged at a distance from one another |
EP0311728A1 (en) † | 1987-10-10 | 1989-04-19 | Johannes Zimmer | Doctoring device |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3216349A (en) * | 1963-02-21 | 1965-11-09 | Johannes Zimmer Maschf | Apparatus for treating sheet material |
AT289157B (en) * | 1967-06-23 | 1971-04-13 | Peter Zimmer | Squeegee device for screen printing machines |
US3988986A (en) * | 1972-04-10 | 1976-11-02 | Peter Zimmer | Anti-drooling device for screen-printing machine |
DE2302084B2 (en) * | 1973-01-17 | 1975-01-16 | Kuesters, Eduard, 4150 Krefeld | Squeegee device for screen printing |
AT349419B (en) * | 1974-09-12 | 1979-04-10 | Zimmer Johannes | MAGNETIC BEAM FOR TREATMENT OF TRACKS |
DE2544784C2 (en) * | 1974-10-15 | 1986-01-23 | Johannes Klagenfurt Kärnten Zimmer | Squeegee device |
DE3001073B1 (en) * | 1980-01-14 | 1981-06-04 | Jagenberg-Werke AG, 4000 Düsseldorf | Device for applying a coating to a material web |
JPS63121537U (en) * | 1987-01-31 | 1988-08-08 | ||
DE8709028U1 (en) * | 1987-06-30 | 1988-11-03 | Zimmer, Johannes, Klagenfurt, Kärnten | Device for guiding a roller when applying a substance to a web |
US5134958A (en) * | 1987-10-10 | 1992-08-04 | Johannes Zimmer | Doctor apparatus for applying fluid material to a substrate |
-
1990
- 1990-01-05 EP EP90901724A patent/EP0408704B2/en not_active Expired - Lifetime
- 1990-01-05 US US07/474,838 patent/US5151132A/en not_active Expired - Lifetime
- 1990-01-05 WO PCT/AT1990/000002 patent/WO1990007387A2/en active IP Right Grant
- 1990-01-05 AT AT90901724T patent/ATE90595T1/en not_active IP Right Cessation
- 1990-01-05 DE DE9090901724T patent/DE59001764D1/en not_active Expired - Fee Related
- 1990-01-05 ES ES90901724T patent/ES2041524T5/en not_active Expired - Lifetime
- 1990-01-05 BR BR909004513A patent/BR9004513A/en not_active IP Right Cessation
- 1990-01-08 CZ CS9098A patent/CZ280958B6/en not_active IP Right Cessation
- 1990-01-08 DE DE9000148U patent/DE9000148U1/en not_active Expired - Lifetime
- 1990-01-09 DD DD90337017A patent/DD291508A5/en not_active IP Right Cessation
- 1990-01-09 DD DD90344379A patent/DD298491A5/en not_active IP Right Cessation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL155759B (en) † | 1967-05-26 | 1978-02-15 | Zimmer Johannes | DEVICE FOR CYLINDER TEMPLATES WITH A ROLLABLE MAGNETIZABLE MATERIAL CONTAINING DIPPER OVER THE INNER WALL OF THE TEMPLATE. |
DE2437006A1 (en) † | 1974-08-01 | 1976-02-19 | Zimmer Johannes | Magnetic roller system with variable contact pressure - has magnetisable counter rollers acting on circumference of magnetic roller |
DE3416029A1 (en) † | 1983-05-24 | 1984-11-29 | Zimmer, Johannes, Klagenfurt, Kärnten | Squeegee device for flat stencils with two squeegee strips arranged at a distance from one another |
EP0311728A1 (en) † | 1987-10-10 | 1989-04-19 | Johannes Zimmer | Doctoring device |
Non-Patent Citations (3)
Title |
---|
Melliand Textilberichte 68 (1987) Seiten 351-352 † |
Prospekt "KOMBI-RAKEL", Johannes Zimmer, 1975 † |
See also references of WO9007387A2 † |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2259262A (en) * | 1991-09-03 | 1993-03-10 | Univ Hull | Blade control system |
GB2259262B (en) * | 1991-09-03 | 1995-04-12 | Univ Hull | Blade control system |
NL1011992C2 (en) | 1999-05-07 | 2000-11-09 | Stork Brabant Bv | Squeegee. |
WO2000068012A1 (en) * | 1999-05-07 | 2000-11-16 | Stork Brabant B.V. | Squeegee device |
CN113140403A (en) * | 2021-04-23 | 2021-07-20 | 黄奕展 | Neodymium iron boron production is with sizing machine convenient to arrangement |
CN113140403B (en) * | 2021-04-23 | 2023-03-10 | 江西粤磁稀土新材料科技有限公司 | Neodymium iron boron production is with sizing machine convenient to arrangement |
Also Published As
Publication number | Publication date |
---|---|
ES2041524T5 (en) | 1998-10-16 |
EP0408704B2 (en) | 1998-07-15 |
ES2041524T3 (en) | 1993-11-16 |
BR9004513A (en) | 1991-07-30 |
DD298491A5 (en) | 1992-02-27 |
DE59001764D1 (en) | 1993-07-22 |
EP0408704B1 (en) | 1993-06-16 |
CZ280958B6 (en) | 1996-05-15 |
DE9000148U1 (en) | 1990-04-12 |
WO1990007387A2 (en) | 1990-07-12 |
US5151132A (en) | 1992-09-29 |
ATE90595T1 (en) | 1993-07-15 |
DD291508A5 (en) | 1991-07-04 |
WO1990007387A3 (en) | 1990-11-01 |
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