GB2220164A - Equipment for extrusion of laminated extrudates of thermoplasticised synthetic materials - Google Patents

Equipment for extrusion of laminated extrudates of thermoplasticised synthetic materials Download PDF

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Publication number
GB2220164A
GB2220164A GB8911886A GB8911886A GB2220164A GB 2220164 A GB2220164 A GB 2220164A GB 8911886 A GB8911886 A GB 8911886A GB 8911886 A GB8911886 A GB 8911886A GB 2220164 A GB2220164 A GB 2220164A
Authority
GB
United Kingdom
Prior art keywords
distribution
block
channels
equipment
extrusion
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.)
Withdrawn
Application number
GB8911886A
Other versions
GB8911886D0 (en
Inventor
Heinz Beisemann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Reifenhaeuser GmbH and Co KG Maschinenenfabrik
Original Assignee
Reifenhaeuser GmbH and Co KG Maschinenenfabrik
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
Application filed by Reifenhaeuser GmbH and Co KG Maschinenenfabrik filed Critical Reifenhaeuser GmbH and Co KG Maschinenenfabrik
Publication of GB8911886D0 publication Critical patent/GB8911886D0/en
Publication of GB2220164A publication Critical patent/GB2220164A/en
Withdrawn legal-status Critical Current

Links

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
    • B29C48/03—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
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • 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
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • 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
    • B29C48/305—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets
    • B29C48/307—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets specially adapted for bringing together components, e.g. melts within the die
    • 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
    • B29C48/49—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using two or more extruders to feed one die or nozzle
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92009—Measured parameter
    • B29C2948/92085—Velocity
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92323—Location or phase of measurement
    • B29C2948/92361—Extrusion unit
    • B29C2948/92409—Die; Nozzle zone
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/9258—Velocity
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92904—Die; Nozzle zone
    • 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
    • B29C48/07—Flat, e.g. panels
    • 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
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Description

1 2220164 EQUIPMENT FOR EXTRUSION OF LAMINATED RIBBONS OF
THERMOPLASTICISED SYNTHETIC MATERIALS The invention relates to equipment for the extrusion of a laminated ribbon of thermoplasticised synthetic materialss, having an extruder and at least one co-extruderf, an entry blockr a co-extrusion block and an exit nozzle tools, in which device the entry block has entry channels and the coextrusion block has a lamination channel together with control channels feeding into the lamination channel and control members for the various streams of thermoplasticised material, the exit nozzle tool being connected to the lamination channel and formed as a single-channel tool. The lamination channel gathers the various materical streams into a composite laminar system, which is formed by the exit nozzle tool into a single laminated material stream and extruded as a ribbon.
In the context of the invention, the term "ribbon" embraces solid and hollow prof ile sections, including tubes, and also slabs and foils.
In known equipment of this type, the entry block is connected directly to the co-extrusion block. Consequently, the laminar stream system and the laminated ribbon consist of laminae prescribed in both sequence and number. The entire equipment is designed to produce this single sequence of laminae. In order to alter the sequence, costly modifications are required and seriously lengthy stoppages must be accepted.
The object of the invention is to modify and improve equipment of the type initially described, in such a manner that the sequence and number of the laminae in the extruded ribbon can be altered by simple means without involving seriously lengthy stoppages.
According to the present invention,, a distribution block is interchangeably interposed between the entry block and the co-extrusion blocki, the distribution block in use is one of a set of interchangeable distribution blocks,, and each i ndiv idual di st r i but i on bl ock conta i ns f eed ch annel s registering with the entry channels and distribution channels registering with the control channels, the connections between the feed channels and the distribution chanriels differing from one distribution block to another distribution block, thereby enabling ribbons with different lamination patterns to be produced.
Preferably, the di stri bution blocks are interchangeably mounted in a distribution block housing. it is self-evident that to avoid temperature disturbances the interchangeable distribution blocks can be preheated before insertion in the equipment or the distribution block housing thereof.
The distribution blocks themselves can be assembled from a plurality of plates having channel-forming bores. More particularlyr an arrangement can be adopted whereby individual plates can be interchanged between different distributor blocks so that distribution blocks having different distribution channels can be assembled together. They can be interchanged as individuals or in groups#, for example in pairs. With distribution blocks of this design, individual plates can f orm parts of all the distribution blocks and be used as required in different distribution blocks.
The construction of an embodiment of the inventiony its mode of functioning and the accruing advantages will now be described, purely by way of exampler with reference to the accompanying drawings, in which:Figure 1 is a schematic view in pespective of equipment in accordance with the invention; Figure 2 shows a set of differing distribution blocks f or the equipment shown in Figure 1; and Figure 3 is an exploded view of a distribution block assembled from a plurality of plates.
The equipment shown in Figure 1 is intended for the extrusion of a laminated ribbon 1 of thermoplasticised synthetic materials. Its basic construction comprises an extruder 2 and two co-extruders 3, an entry block 4j, a coextrusion block 5 and an exit nozzle tool 6. The entry block has entry channels 7. The co-extrusion block 5 has a lamination channel 8 together with control channels 9 feeding into the lamination channel 8 and control members 10 for the various streams of thermoplasticised material. The exit nozzle tool 6 is connected to the lamination channel P and is formed as a single-channel tool,, the connection being made through an elbow connector 11.
Between the entry block 4 and the co-extrusion block 5 there is interposed a distribution block 12. It is interchangeably interposed. The distribution block 12 in use is one of a set of numerous interchangeable distribution blocks distinguished in Figure 2 by the letters a,, b and c.
Each individual distribution block 12 contains feed channels 13 registering with the entry channels 7 and distribution channels 14 registering with the control channels 9, the connections between the feed channels 13 and the distribution channels differing as between examples a,, b and cr and therefore forming different lamination patterns in the ribbon 1.
The equipment of Figure 1 may be used f or the production of laminated plastics foils by the co-extrusion method. The ribbon 1 is a f ive-ply plastics foil. The laminae have been drawn with thick lines in Figure 1, for cl ari ty. In this case, the distribution block 12 shown in Figure 2a has been mounted in the distribution block housing 15. One could equally well select either of the other distribution blocks 12 shown in Figures 2b and 2c. Referring to Figure 2a, the distribution block in use has three feed channels 13 and f ive distribution channels 14. The coextrusion block 5 has five control channels 9, four of which are fitted with control members 10 in the form of sliders. Figure 2b shows a distribution block 12 having only two feed channels 13 and three distribution channels 14,, so that when it is used in equipment in accordance with the invention it will only produce a three-ply ribbon 1. In this caser only one of the coextruders 3 is connected up and/or used. The distribution block 12 shown in Figure 2c is like that shown in Figure 2a, except that the lamination sequence has been chan ge d. The distribution blocks 12 are all interchangeable. Figure 2a also shows that the distribution blocks 12 can be assembled from plates 16. Details of the assembly of distribution blocks 12 from a plurality of plates 16 are shown in Figures 3a to 3e. The plates 16 can be stacked to form a distribution block 12,, and mounted for example in a suitable housing not shown. They can also be paired with other plates,, not shown. to form a different distribution block.

Claims (6)

1. Equipment for the extrusion of a laminated ribbon of thermoplasticised synthetic materials, having an extruder and at least one co-extruderg, an entry blocky a co-extrusion block, and an exit nozzle tool#, in which device the entry block has entry channels and the co-extrusion block has a lamination channel together with control channels feeding into the lamination channel and control members for the various streams of thermoplasticised materiali the exit nozzle tool being connected to the lamination channel and formed as a single-channel tool, and wherein a distribution block is interchangeably interposed between the entry block and the coextrusion block, the distribution block in use is one of a set of interchangeable distribution blocks and each individual distribution block contains feed channels registering with the entry channels and distribution channels registering with the control channels,, the connections between the feed channels and the distribution channels differing from one distribution block to another distribution block, thereby enabling ribbons with different lamination patterns to be produced.
2. Equipment as in Claim 1, wherein the distribution blocks are interchangeably mounted in a distribution block housing.
3. Equipment as in either of Claims 1 and 2r wherein the distribution blocks are assembled from a plurality of plates having channel-forming bores.
4. Equipment as in Claim 3, wherein individual plates can be interchanged between different distributor 0 - 7 blocks so that distribution blocks having different distribution channels can be assembled together.
5. Equipment as in either of Claims 3 and 4r wherein individual plates form parts of all the distribution blocks.
6. Equipment for the extrusion of a laminated ribbon of thermoplasticised synthetic materials substantially as hereinbefore described with reference to the accompanying drawings.
Published 1989 at The Patent Office, State House, 88/71 High Holborn. London WClR 4TP. Further copies May be obtained from The Patent Ofnee. Sales Branch, St Mary Cray, Orpington, Kent BR5 3RD. Printed by Multiplex techniques ltd, St Mary Cray, Kent, Con. 1/87
GB8911886A 1988-06-29 1989-05-24 Equipment for extrusion of laminated extrudates of thermoplasticised synthetic materials Withdrawn GB2220164A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE3821902A DE3821902A1 (en) 1988-06-29 1988-06-29 PLANT FOR EXTRUDING A MULTILAYERED STRAND OF THERMOPLASTIFIED PLASTICS

Publications (2)

Publication Number Publication Date
GB8911886D0 GB8911886D0 (en) 1989-07-12
GB2220164A true GB2220164A (en) 1990-01-04

Family

ID=6357502

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8911886A Withdrawn GB2220164A (en) 1988-06-29 1989-05-24 Equipment for extrusion of laminated extrudates of thermoplasticised synthetic materials

Country Status (5)

Country Link
JP (1) JPH0753409B2 (en)
DE (2) DE3821902A1 (en)
FR (1) FR2633555A1 (en)
GB (1) GB2220164A (en)
IT (1) IT1230870B (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5110530A (en) * 1990-09-07 1992-05-05 W. R. Grace & Co.-Conn. Striped film method
EP0653285A1 (en) * 1993-11-15 1995-05-17 United Biscuits (Uk) Limited Coextrusion of multilayered food products
FR2744949A1 (en) * 1996-02-16 1997-08-22 Togum Adjustable closure module for co-extruder
EP1136229A2 (en) * 2000-03-21 2001-09-26 Cloeren Incorporated Layer sequence selecting device
WO2009034591A1 (en) * 2007-09-13 2009-03-19 S.I.M.A. Societa' Industrie Meccaniche Affini S.R.L. Extrusion head for plastic materials
US7754124B2 (en) * 2006-04-21 2010-07-13 Southwire Company Method and apparatus for multi-stream metered extrusion

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4020950A1 (en) * 1990-06-30 1992-01-02 Berstorff Gmbh Masch Hermann Extruder for multilayer plastics - has package of plates in molten material distribution units with different geometries to form flow channels
DE10119066A1 (en) * 2001-04-18 2002-10-31 Topf Kunststofftechnik Gmbh Ki Device for producing an extruded profile strand
CN1251854C (en) * 2003-01-10 2006-04-19 曼夫瑞德·A·A·鲁波克 Flow distributor for mould of pipe moulding device with distance extruder
CN104002459B (en) * 2014-05-26 2016-03-30 安徽中意胶带有限责任公司 A kind of two-sided four layers of unitary-core flame-resistant conveying belt composite co-extruding coating die
FR3079772B1 (en) * 2018-04-06 2020-03-27 Compagnie Generale Des Etablissements Michelin EXTRUSION PLANT FOR TAPE OF PROFILES MADE FROM ELASTOMERIC MIXTURES

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB374147A (en) * 1931-03-06 1932-06-06 Erinoid Ltd Improvements in or relating to apparatus for extruding plastic materials
GB1067908A (en) * 1964-10-02 1967-05-03 Dow Chemical Co Extrusion die
GB1408622A (en) * 1971-10-01 1975-10-01 Dow Chemical Co Method and apparatus for multilayer coextrusion
GB1410777A (en) * 1971-09-27 1975-10-22 Dow Chemical Co Coextrusion apparatus
EP0050476A2 (en) * 1980-10-20 1982-04-28 The Standard Oil Company Coextrusion device and method
GB2161745A (en) * 1984-07-19 1986-01-22 Nisshin Dca Foods Inc Food material extrusion machine

Family Cites Families (8)

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JPS55222A (en) * 1978-06-07 1980-01-05 Fuji Photo Film Co Ltd Marking with powder
US4483669A (en) * 1982-08-16 1984-11-20 Cosden Technology, Inc. Multiple-layered sheeting apparatus
US4443397A (en) * 1982-08-16 1984-04-17 Cosden Technology, Inc. Multiple-layered sheeting apparatus and process therefor
DE3605323A1 (en) * 1985-03-04 1986-09-04 COEXPAN, S.A., San Fernando de Henares, Madrid MACHINE FOR EXTRUDING PLASTIC
FR2579516B1 (en) * 1985-04-01 1987-06-12 Solvay POWER SUPPLY FOR FLAT COEXTRUSION SECTOR
FR2593111B1 (en) * 1986-01-17 1988-07-22 Ono THERMOPLASTIC MATERIAL DISTRIBUTION DEVICE FOR THE EXTRUSION OF MULTILAYERED SHEETS.
JPH0655402B2 (en) * 1986-02-19 1994-07-27 東芝機械株式会社 Coextrusion equipment
JPH066325B2 (en) * 1986-05-13 1994-01-26 三菱重工業株式会社 Composite adapter for extrusion

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB374147A (en) * 1931-03-06 1932-06-06 Erinoid Ltd Improvements in or relating to apparatus for extruding plastic materials
GB1067908A (en) * 1964-10-02 1967-05-03 Dow Chemical Co Extrusion die
GB1410777A (en) * 1971-09-27 1975-10-22 Dow Chemical Co Coextrusion apparatus
GB1408622A (en) * 1971-10-01 1975-10-01 Dow Chemical Co Method and apparatus for multilayer coextrusion
EP0050476A2 (en) * 1980-10-20 1982-04-28 The Standard Oil Company Coextrusion device and method
GB2161745A (en) * 1984-07-19 1986-01-22 Nisshin Dca Foods Inc Food material extrusion machine

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5110530A (en) * 1990-09-07 1992-05-05 W. R. Grace & Co.-Conn. Striped film method
EP0653285A1 (en) * 1993-11-15 1995-05-17 United Biscuits (Uk) Limited Coextrusion of multilayered food products
GB2283699B (en) * 1993-11-15 1998-01-14 United Biscuits Ltd Improvements in and relating to the production of food products
FR2744949A1 (en) * 1996-02-16 1997-08-22 Togum Adjustable closure module for co-extruder
EP1136229A2 (en) * 2000-03-21 2001-09-26 Cloeren Incorporated Layer sequence selecting device
US6398535B1 (en) 2000-03-21 2002-06-04 Cloeren Incorporated Layer sequence selecting device
EP1136229A3 (en) * 2000-03-21 2002-07-17 Cloeren Incorporated Layer sequence selecting device
US7754124B2 (en) * 2006-04-21 2010-07-13 Southwire Company Method and apparatus for multi-stream metered extrusion
WO2009034591A1 (en) * 2007-09-13 2009-03-19 S.I.M.A. Societa' Industrie Meccaniche Affini S.R.L. Extrusion head for plastic materials

Also Published As

Publication number Publication date
JPH02175124A (en) 1990-07-06
GB8911886D0 (en) 1989-07-12
DE3821902A1 (en) 1990-01-04
IT1230870B (en) 1991-11-08
DE8816689U1 (en) 1990-04-05
FR2633555A1 (en) 1990-01-05
DE3821902C2 (en) 1990-04-05
IT8920912A0 (en) 1989-06-19
JPH0753409B2 (en) 1995-06-07

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