CA2120165A1 - Device for plasticating unidirectionally fiber-reinforced thermoplastic granules - Google Patents
Device for plasticating unidirectionally fiber-reinforced thermoplastic granulesInfo
- Publication number
- CA2120165A1 CA2120165A1 CA002120165A CA2120165A CA2120165A1 CA 2120165 A1 CA2120165 A1 CA 2120165A1 CA 002120165 A CA002120165 A CA 002120165A CA 2120165 A CA2120165 A CA 2120165A CA 2120165 A1 CA2120165 A1 CA 2120165A1
- Authority
- CA
- Canada
- Prior art keywords
- plastication
- screw
- barrel
- plasticating
- thermoplastic granules
- 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.)
- Abandoned
Links
- 239000008187 granular material Substances 0.000 title claims abstract description 10
- 229920001169 thermoplastic Polymers 0.000 title claims abstract description 7
- 239000004416 thermosoftening plastic Substances 0.000 title claims abstract description 7
- 239000000835 fiber Substances 0.000 claims abstract description 7
- 238000006073 displacement reaction Methods 0.000 claims abstract description 5
- 238000007493 shaping process Methods 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 description 6
- 238000001816 cooling Methods 0.000 description 1
- CEJLBZWIKQJOAT-UHFFFAOYSA-N dichloroisocyanuric acid Chemical compound ClN1C(=O)NC(=O)N(Cl)C1=O CEJLBZWIKQJOAT-UHFFFAOYSA-N 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000003685 thermal hair damage Effects 0.000 description 1
Classifications
-
- 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
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
- B29C48/397—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using a single screw
-
- 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
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
- B29C48/45—Axially movable screws
-
- 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
-
- 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
- B29C48/30—Extrusion nozzles or dies
- B29C48/301—Extrusion nozzles or dies having reciprocating, oscillating or rotating parts
-
- 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
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
-
- 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
- B29C48/68—Barrels or cylinders
- B29C48/681—Barrels or cylinders for single screws
-
- 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
- B29C48/92—Measuring, controlling or regulating
-
- 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
- B29C48/04—Particle-shaped
-
- 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
- B29C48/05—Filamentary, e.g. strands
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
- B29K2105/08—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
- B29K2105/12—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of short lengths, e.g. chopped filaments, staple fibres or bristles
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
Abstract of the Disclosure Device for the plastication of unidirectionally fiber-reinforced thermoplastic granules In the device for the plastication of thermoplastic granules reinforced with long fibers, a plastication screw is arranged in the conical feed part and cylindrical discharge part of the plastication barrel.
The discharge part (5) is provided with a shaping, closable die (8) and the plastication screw (3) has an apparatus (6) for the axial displacement of the screw (3) with respect to the plastication barrel.
The discharge part (5) is provided with a shaping, closable die (8) and the plastication screw (3) has an apparatus (6) for the axial displacement of the screw (3) with respect to the plastication barrel.
Description
HOECHST ~;TIENGESELLSC~FT HOE 93/F 092 DPh.HS/we Device for plasticating unidirectionally fiber-rein~orced thermoplastic granules The invention relate~ to a device for plasticating unidirectionally fiber-reinforced thermoplaatic granule~, compri~ing a plastication barrel in the conical eed part and cylindrical discharge part of which a plastication ~crew i~ arranged.
The po~sible applications of thermoplastics can be extended by incorporating reinforcing fiber3. By the addition of long fibers (fiber length ~ 4 mm), all mechanical characteristic values of thermoplastics c~n be signi~icantly improved. Whereas the production of pla~tic granule~ with the addition of long-fiber~ haa been largely accomplished, the plastication and premolding of such granules still causes difficultie~, since the fibers are damaged when the known plastication apparatus is u~ed. They are mechanically comminuted. The invention intends to remedy thi~ situation.
The object i~ achieved by a device of ~he type mentioned at the outset, in which the discharge part i~ provided wlth a clo~able ~haping die and ~he pla~tication ~craw ha~ an apparatu~ for axial displacement of the Rcr~w with re~pect to the plastication barrel.
The apparatu~ for the axial displacement o~ the pla~tication ~crew may co~pri~e controllable hydraulic cylinder~. The hydrau~ic cylinder~ may be attach0d to the pla~tication barrcl and the cloRure of the die may comprise a guillotine knife.
During ~he plastication proce~s, the pla~ticakion screw yields under the adjustable back pre~sure. After ~ill3ng and opening o the die, the 6crew tra~elg in the opposite direc ion towards the die and force~ out the pla~ticated ., - , :-:: : :
i, :: : : , 6 ~
The po~sible applications of thermoplastics can be extended by incorporating reinforcing fiber3. By the addition of long fibers (fiber length ~ 4 mm), all mechanical characteristic values of thermoplastics c~n be signi~icantly improved. Whereas the production of pla~tic granule~ with the addition of long-fiber~ haa been largely accomplished, the plastication and premolding of such granules still causes difficultie~, since the fibers are damaged when the known plastication apparatus is u~ed. They are mechanically comminuted. The invention intends to remedy thi~ situation.
The object i~ achieved by a device of ~he type mentioned at the outset, in which the discharge part i~ provided wlth a clo~able ~haping die and ~he pla~tication ~craw ha~ an apparatu~ for axial displacement of the Rcr~w with re~pect to the plastication barrel.
The apparatu~ for the axial displacement o~ the pla~tication ~crew may co~pri~e controllable hydraulic cylinder~. The hydrau~ic cylinder~ may be attach0d to the pla~tication barrcl and the cloRure of the die may comprise a guillotine knife.
During ~he plastication proce~s, the pla~ticakion screw yields under the adjustable back pre~sure. After ~ill3ng and opening o the die, the 6crew tra~elg in the opposite direc ion towards the die and force~ out the pla~ticated ., - , :-:: : :
i, :: : : , 6 ~
material.
The device essentially provides the advantage that the fiber-reinforced granules with a length of 10 to 100 mm and a thickness of 0.1 to 50 mm with fiber~ with a length of 10 to 100 mm a~d a thickness of 5 to 30 ~m are drawn in gently, that iB to Ray without mechanical comminution, into the pla_tication part of the device, are plastlcated with minimum shear stre~sing and are di~charged in a preformed state after the plastication. Since the dsvice ha~ no dead spot~, thermal damage to the plasticated material iR avoided.
The invention i~ explained in greater detail below with reference to the figures, in which Figure 1 ~how~ a lateral, partly ~eetional view of the device during filling with material and Figure 2 ~hows the device according to Figure 1 during di~charge of the plasticated material.
The device for plastication consi~ts of a plastication barrel 1, in th~ conical feed part 2 and cylindrical discharge part 5 of which a pla~tication s¢rew 3 i~
arranged. The device may be mounted 80 aB to be pivot-able, vertically, horizo~tally or perpe~dicularly to the ~crew axi~, a~out the axis 10. On the discharge part 5, thexe is axranged a shaping die 8 which i~ ~ollow~d by a cloaure el~mont 9. The clo~ure element 9 may comprise a guillotlne knife. The p}a~tication screw 3 i~
rotationally driven by means of dri~e 7 on which an apparatu~ 6 for the axial di placement o$ the c~rew 3 with re~pect to the plastication barrel is arranged. The apparatus 6, ~or example controll~bl2 hydraulic cyli~ders, i~ ~upported together with the plasticati3 barrel 1 on a co~mon machine bed 11 or, ~s illu~trated, is ~upported on the plastication barrel 1. The ~iber-reinforced granules 15 pass ~ia opening 4 into the ~,: , , . . , ~ , ;. . ''. :
- ~ .
. ~ . , .. .. :
. :
~ .. . .:
~: 1. 2! 0 ~ ^` J
conical feed part 2 and from there are driven by means of a plastication screw 3 towards the closure ~lement 9, during which they are plasticated. During thi~ proce~ a back pressure builds up, l~nder which the ~crew 3 yields S in a direction opposite to the material flow direction, as is indicated by arrow 12. After the clo~ure element 9 is opened, the screw 3 moves towards opening 16 of the discharge part 5 (arrow 13) and discharge~ the plasti-cated material via the Rhaping die 8. The cros3 ~ection of the die opening may be delimited by any contour, depending on what ~hape thP molding i8 intended to have.
4 indicates a temperature-control apparatu~ (heating or cooling apparatus) for the plastication barrel. 17 indicates a support for the closure element 9, and 18 indicates a hydraulic drive apparatus for said closure element 9.
.. ~ . . .: . .
:. : : ~ ~ . . .
.
The device essentially provides the advantage that the fiber-reinforced granules with a length of 10 to 100 mm and a thickness of 0.1 to 50 mm with fiber~ with a length of 10 to 100 mm a~d a thickness of 5 to 30 ~m are drawn in gently, that iB to Ray without mechanical comminution, into the pla_tication part of the device, are plastlcated with minimum shear stre~sing and are di~charged in a preformed state after the plastication. Since the dsvice ha~ no dead spot~, thermal damage to the plasticated material iR avoided.
The invention i~ explained in greater detail below with reference to the figures, in which Figure 1 ~how~ a lateral, partly ~eetional view of the device during filling with material and Figure 2 ~hows the device according to Figure 1 during di~charge of the plasticated material.
The device for plastication consi~ts of a plastication barrel 1, in th~ conical feed part 2 and cylindrical discharge part 5 of which a pla~tication s¢rew 3 i~
arranged. The device may be mounted 80 aB to be pivot-able, vertically, horizo~tally or perpe~dicularly to the ~crew axi~, a~out the axis 10. On the discharge part 5, thexe is axranged a shaping die 8 which i~ ~ollow~d by a cloaure el~mont 9. The clo~ure element 9 may comprise a guillotlne knife. The p}a~tication screw 3 i~
rotationally driven by means of dri~e 7 on which an apparatu~ 6 for the axial di placement o$ the c~rew 3 with re~pect to the plastication barrel is arranged. The apparatus 6, ~or example controll~bl2 hydraulic cyli~ders, i~ ~upported together with the plasticati3 barrel 1 on a co~mon machine bed 11 or, ~s illu~trated, is ~upported on the plastication barrel 1. The ~iber-reinforced granules 15 pass ~ia opening 4 into the ~,: , , . . , ~ , ;. . ''. :
- ~ .
. ~ . , .. .. :
. :
~ .. . .:
~: 1. 2! 0 ~ ^` J
conical feed part 2 and from there are driven by means of a plastication screw 3 towards the closure ~lement 9, during which they are plasticated. During thi~ proce~ a back pressure builds up, l~nder which the ~crew 3 yields S in a direction opposite to the material flow direction, as is indicated by arrow 12. After the clo~ure element 9 is opened, the screw 3 moves towards opening 16 of the discharge part 5 (arrow 13) and discharge~ the plasti-cated material via the Rhaping die 8. The cros3 ~ection of the die opening may be delimited by any contour, depending on what ~hape thP molding i8 intended to have.
4 indicates a temperature-control apparatu~ (heating or cooling apparatus) for the plastication barrel. 17 indicates a support for the closure element 9, and 18 indicates a hydraulic drive apparatus for said closure element 9.
.. ~ . . .: . .
:. : : ~ ~ . . .
.
Claims (4)
1. A device for plasticating thermoplastic granules reinforced with long fibers, comprising a plastication barrel in the conical feed part and cylindrical discharge part of which a plastication screw is arranged, wherein the discharge part (5) is provided with closable shaping die (8) and the plastication screw (3) has an apparatus (6) for the axial displacement of the screw (3) with respect to the plastication barrel.
2. The device as claimed in claim 1, wherein the device (6) for the axial displacement of the plastication screw (3) comprises controllable hydraulic cylinders.
3. The device as claimed in claim 2, wherein the hydraulic cylinders are attached to the plastication barrel.
4. The device as claimed in claim 1, wherein the closure element (9) of the die (8) comprises a guillotine knife.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4310253A DE4310253A1 (en) | 1993-03-30 | 1993-03-30 | Device for plasticizing unidirectional fiber-reinforced thermoplastic granules |
| DEP4310253.0 | 1993-03-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2120165A1 true CA2120165A1 (en) | 1994-10-01 |
Family
ID=6484187
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002120165A Abandoned CA2120165A1 (en) | 1993-03-30 | 1994-03-29 | Device for plasticating unidirectionally fiber-reinforced thermoplastic granules |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0618060A1 (en) |
| JP (1) | JPH06297455A (en) |
| KR (1) | KR940021216A (en) |
| CA (1) | CA2120165A1 (en) |
| DE (1) | DE4310253A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5591384A (en) * | 1994-03-31 | 1997-01-07 | Modern Technologies Corp. | Method for molding parts |
| US5800757A (en) * | 1994-03-31 | 1998-09-01 | Modern Technologies Corp. | System and method for molding a basketball backboard |
| CN111372748A (en) | 2017-11-01 | 2020-07-03 | 株式会社日本制钢所 | Extruder and die of extruder |
| DE102019213381A1 (en) * | 2019-09-04 | 2021-03-04 | Guangdong Yizumi Precision Machinery Co., Ltd. | Extruder of a machine tool for additive manufacturing |
| DE102019213384A1 (en) * | 2019-09-04 | 2021-03-04 | Guangdong Yizumi Precision Machinery Co., Ltd. | Machine tool for additive manufacturing with an extruder |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL256540A (en) * | 1960-05-27 | 1900-01-01 | ||
| GB983440A (en) * | 1963-02-07 | 1965-02-17 | Harold Verity Smith | Improvements in blow-moulding machines |
| CH423082A (en) * | 1963-03-29 | 1966-10-31 | Lilon Establishment | Device, consisting of a screw press and a subsequent gear spinning pump, for the production of threads or thread bundles |
| DE1496386B2 (en) * | 1963-10-02 | 1973-03-01 | Alpine Ag, 8900 Augsburg | APPLICATION OF A SCREW PRESS TO FEED A SPINNER NOZZLE |
| US3427639A (en) * | 1966-07-25 | 1969-02-11 | Pennsalt Chemicals Corp | Injection molding apparatus |
| US3550201A (en) * | 1968-01-22 | 1970-12-29 | Baker Perkins Inc | Vertical mixer,kneader and reactor for plastic materials and the like |
| US3729280A (en) * | 1969-12-10 | 1973-04-24 | Hehl Karl | Injection molding unit |
| FI95217C (en) * | 1989-09-05 | 1996-01-10 | Composite Prod Inc | Apparatus and method for mixing reinforcing fibers with a thermoplastic resin |
-
1993
- 1993-03-30 DE DE4310253A patent/DE4310253A1/en not_active Withdrawn
-
1994
- 1994-03-16 EP EP94104080A patent/EP0618060A1/en not_active Withdrawn
- 1994-03-28 KR KR1019940006180A patent/KR940021216A/en not_active Application Discontinuation
- 1994-03-28 JP JP6056507A patent/JPH06297455A/en active Pending
- 1994-03-29 CA CA002120165A patent/CA2120165A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| KR940021216A (en) | 1994-10-17 |
| EP0618060A1 (en) | 1994-10-05 |
| JPH06297455A (en) | 1994-10-25 |
| DE4310253A1 (en) | 1994-10-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |