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FR2434023A1 - PROCESS FOR APPLYING SYNTHETIC RESIN COATINGS TO POLYCARBONATE SHEETS AND PANELS - Google Patents

PROCESS FOR APPLYING SYNTHETIC RESIN COATINGS TO POLYCARBONATE SHEETS AND PANELS

Info

Publication number
FR2434023A1
FR2434023A1 FR7918901A FR7918901A FR2434023A1 FR 2434023 A1 FR2434023 A1 FR 2434023A1 FR 7918901 A FR7918901 A FR 7918901A FR 7918901 A FR7918901 A FR 7918901A FR 2434023 A1 FR2434023 A1 FR 2434023A1
Authority
FR
France
Prior art keywords
synthetic resin
panels
resin coatings
polycarbonate sheets
exploited
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
Application number
FR7918901A
Other languages
French (fr)
Other versions
FR2434023B1 (en
Inventor
Peter Kaube
Franz Wenzel
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.)
Roehm GmbH Darmstadt
Original Assignee
Roehm GmbH Darmstadt
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 Roehm GmbH Darmstadt filed Critical Roehm GmbH Darmstadt
Publication of FR2434023A1 publication Critical patent/FR2434023A1/en
Application granted granted Critical
Publication of FR2434023B1 publication Critical patent/FR2434023B1/fr
Granted 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
    • 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
    • B29C48/255—Flow control means, e.g. valves
    • B29C48/2556—Flow control means, e.g. valves provided in or in the proximity of dies
    • 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
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/305—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets
    • B29C48/31—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets being adjustable, i.e. having adjustable exit sections
    • 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
    • B29C48/31—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets being adjustable, i.e. having adjustable exit sections
    • B29C48/313—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets being adjustable, i.e. having adjustable exit sections by positioning the die lips
    • 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
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • B32B27/283—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polysiloxanes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B32B27/365—Layered products comprising a layer of synthetic resin comprising polyesters comprising polycarbonates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • B29C2948/92609—Dimensions
    • B29C2948/92647—Thickness
    • 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
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/584—Scratch resistance
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2333/00—Polymers of unsaturated acids or derivatives thereof
    • B32B2333/04—Polymers of esters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2383/00—Polysiloxanes

Landscapes

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

Abstract

On forme simultanément le panneau ou feuille de polycarbonate et la couche de résine synthétique de revêtement par co-extrusion dans un appareil équipé d'une filière à plusieurs matières (voir sur la figure les canaux d'écoulement 3 à 16), l'adhérence de la couche de résine synthétique sur le panneau ou feuille de polycarbonate étant réalisée au cours de l'opération d'extrusion. La résine synthétique est notamment un polymère ou copolymère d'acrylate ou méthacrylate et l'on peut en outre procéder à un calandrage et appliquer en couche finale ou revêtement résistant à l'éraflage. Le procédé selon l'invention peut être exploité en particulier Le procédé selon l'invention peut être exploité en particulier pour appliquer sur des panneaux de polycarbonate transparent des revêtements qui résistant mieux aux influences climatiques et à l'éraflage, en vue de la fabrication d'éléments d'appareils d'éclairage, de lanternes, de vitrages et similaires.The polycarbonate panel or sheet and the synthetic resin coating layer are simultaneously formed by co-extrusion in an apparatus equipped with a multi-material die (see in the figure the flow channels 3 to 16), the adhesion of the synthetic resin layer on the polycarbonate panel or sheet being produced during the extrusion operation. The synthetic resin is in particular an acrylate or methacrylate polymer or copolymer and it is also possible to proceed with calendering and to apply as a final layer or coating resistant to scratching. The process according to the invention can be exploited in particular The process according to the invention can be exploited in particular to apply to transparent polycarbonate panels coatings which are more resistant to climatic influences and to scuffing, with a view to the manufacture of 'elements of lighting fixtures, lanterns, glazing and the like.

FR7918901A 1978-07-26 1979-07-23 PROCESS FOR APPLYING SYNTHETIC RESIN COATINGS TO POLYCARBONATE SHEETS AND PANELS Granted FR2434023A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19782832676 DE2832676A1 (en) 1978-07-26 1978-07-26 COATING PROCESS

Publications (2)

Publication Number Publication Date
FR2434023A1 true FR2434023A1 (en) 1980-03-21
FR2434023B1 FR2434023B1 (en) 1982-09-17

Family

ID=6045358

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7918901A Granted FR2434023A1 (en) 1978-07-26 1979-07-23 PROCESS FOR APPLYING SYNTHETIC RESIN COATINGS TO POLYCARBONATE SHEETS AND PANELS

Country Status (6)

Country Link
JP (1) JPS5559929A (en)
DE (1) DE2832676A1 (en)
FR (1) FR2434023A1 (en)
GB (1) GB2028228B (en)
IT (1) IT1121001B (en)
NL (1) NL7905450A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3605323A1 (en) * 1985-03-04 1986-09-04 COEXPAN, S.A., San Fernando de Henares, Madrid MACHINE FOR EXTRUDING PLASTIC

Families Citing this family (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8233007U1 (en) * 1982-11-25 1983-03-24 Röhm GmbH, 6100 Darmstadt POLYCARBONATE PLASTIC PANEL
DE3244953C2 (en) * 1982-12-04 1984-11-29 Röhm GmbH, 6100 Darmstadt Process for the production of a hollow plastic sheet
DE8302842U1 (en) * 1983-02-03 1983-07-07 Röhm GmbH, 6100 Darmstadt MULTI-LAYER PLATE
DE3312611A1 (en) * 1983-04-08 1984-10-11 Röhm GmbH, 6100 Darmstadt METHOD FOR PRODUCING UV-PROTECTED MULTILAYERED PLASTIC MOLDED BODIES
AT383991B (en) * 1985-11-14 1987-09-10 Klepsch Senoplast METHOD FOR PRODUCING COMPOSITE PANELS
JPH0655451B2 (en) * 1986-02-06 1994-07-27 ヤマトエスロン株式会社 Synthetic resin food container and manufacturing method thereof
DE3739765A1 (en) * 1987-11-24 1989-06-08 Bayer Ag COATED SHAPED BODIES AND A METHOD FOR THEIR PRODUCTION
US4948666A (en) * 1988-04-22 1990-08-14 Mobay Corporation Stain resistant polycarbonate panels
DE3837589A1 (en) * 1988-11-05 1990-05-10 Roehm Gmbh UV-ABSORBENT METHACRYLATE PROTECTIVE LAYER FOR POLYCARBONATE
FR2636005B1 (en) * 1988-09-07 1990-10-19 Kaysersberg Sa MULTI-LAYER PLATE BASED ON POLYCARBONATE PROTECTED AGAINST UV RADIATION
DE3837588A1 (en) * 1988-11-05 1990-05-10 Roehm Gmbh IMPACT TOE, METHACRYLATE PROTECTIVE LAYER WITH UV ABSORBER FOR POLYCARBONATE
NL9001264A (en) * 1990-06-05 1992-01-02 Gen Electric METHOD FOR COEXTRUDING A PLATE-SHAPED PRODUCT AND PRODUCTS SO OBTAINED.
US5258215A (en) * 1990-06-05 1993-11-02 General Electric Company Method of coextruding a plate-shaped product and the products thus obtained
CA2070079C (en) * 1992-05-29 1997-06-10 Vittorio De Zen Thermoplastic structural system and components therefor and method of making same
US5856012A (en) * 1993-10-18 1999-01-05 Bayer Ag Process for the production of multilayer plastic sheets
US5679383B1 (en) * 1994-02-04 1999-01-05 Extrusion Dies Inc Dual flexible lip extrusion apparatus
GB2290745A (en) * 1994-07-01 1996-01-10 Ciba Geigy Ag Coextruded stabilised laminated thermolastics
US5484828A (en) * 1994-11-18 1996-01-16 Bayer Corporation Color-stable polycarbonate composition and articles molded therefrom
US6004678A (en) * 1996-08-16 1999-12-21 General Electric Company Low plate out polycarbonate compositions
ATE261033T1 (en) * 1997-04-23 2004-03-15 Rodeca Gmbh PANEL-SHAPED WALL OR ROOF ELEMENT AND METHOD AND DEVICE FOR PRODUCING SAME
TWI284092B (en) 2000-02-01 2007-07-21 Sumitomo Chemical Co Recycled plastic product
US6663375B1 (en) 2000-06-19 2003-12-16 Extrusion Dies, Inc. Dual flexible lip extrusion apparatus with pivoting actuation member
EP1516722B1 (en) * 2002-06-21 2015-09-02 Teijin Chemicals, Ltd. Acrylic resin composition, organosiloxane resin composition and laminates made by using them
DE10331670A1 (en) * 2003-07-14 2005-03-03 Bayer Materialscience Ag Multi-layered product with improved visibility of the coextruded side
DE102006060163A1 (en) * 2006-12-18 2008-06-19 Evonik Röhm Gmbh film composite
JP5267488B2 (en) * 2010-03-11 2013-08-21 信越化学工業株式会社 Polycarbonate resin laminate
WO2021100661A1 (en) 2019-11-18 2021-05-27 三菱瓦斯化学株式会社 Resin composition, flat molded body, multilayer body, and anti-reflection molded body

Citations (3)

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Publication number Priority date Publication date Assignee Title
DE1963278A1 (en) * 1968-12-18 1970-07-09 Du Pont Hexa- (alkoxymethyl) melamine-modified, hydroxylated fluoropolymer coating compositions and processes for their production and use
US3582398A (en) * 1965-05-18 1971-06-01 Gen Electric Polycarbonate substrate with an acrylate coating thereon
US3933964A (en) * 1971-04-26 1976-01-20 Brooks Bernard W Resin laminate and method of making

Family Cites Families (4)

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JPS5513907B2 (en) * 1973-04-14 1980-04-12
JPS5051582A (en) * 1973-09-08 1975-05-08
JPS6015464B2 (en) * 1976-04-15 1985-04-19 三井化学株式会社 Multilayer laminated structure
JPS5943306B2 (en) * 1976-05-26 1984-10-20 住友化学工業株式会社 Flame retardant resin composite

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
US3582398A (en) * 1965-05-18 1971-06-01 Gen Electric Polycarbonate substrate with an acrylate coating thereon
DE1963278A1 (en) * 1968-12-18 1970-07-09 Du Pont Hexa- (alkoxymethyl) melamine-modified, hydroxylated fluoropolymer coating compositions and processes for their production and use
US3933964A (en) * 1971-04-26 1976-01-20 Brooks Bernard W Resin laminate and method of making

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3605323A1 (en) * 1985-03-04 1986-09-04 COEXPAN, S.A., San Fernando de Henares, Madrid MACHINE FOR EXTRUDING PLASTIC

Also Published As

Publication number Publication date
JPS5559929A (en) 1980-05-06
IT1121001B (en) 1986-03-26
DE2832676A1 (en) 1980-02-07
IT7968462A0 (en) 1979-07-12
GB2028228A (en) 1980-03-05
GB2028228B (en) 1983-03-23
NL7905450A (en) 1980-01-29
FR2434023B1 (en) 1982-09-17

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