DE1905677A1 - Verfahren zum Kristallisieren von Polyestern - Google Patents

Verfahren zum Kristallisieren von Polyestern

Info

Publication number
DE1905677A1
DE1905677A1 DE19691905677 DE1905677A DE1905677A1 DE 1905677 A1 DE1905677 A1 DE 1905677A1 DE 19691905677 DE19691905677 DE 19691905677 DE 1905677 A DE1905677 A DE 1905677A DE 1905677 A1 DE1905677 A1 DE 1905677A1
Authority
DE
Grant status
Application
Patent type
Prior art keywords
method
crystallizing polyesters
crystallizing
polyesters
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.)
Pending
Application number
DE19691905677
Other languages
English (en)
Inventor
Balint Laszlo Joseph
Abos Ramon Luis
Snider Orvil Edward
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.)
Snia Viscosa SpA
Original Assignee
Snia Viscosa SpA
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

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G
    • C08J3/00Processes of treating or compounding macromolecular substances
    • C08J3/12Powdering or granulating
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29BPREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B13/00Conditioning or physical treatment of the material to be shaped
    • B29B13/06Conditioning or physical treatment of the material to be shaped by drying
    • B29B13/065Conditioning or physical treatment of the material to be shaped by drying of powder or pellets
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29BPREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00Making granules
    • B29B9/02Making granules by dividing preformed material
    • B29B9/06Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29BPREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00Making granules
    • B29B9/02Making granules by dividing preformed material
    • B29B9/06Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
    • B29B9/065Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion under-water, e.g. underwater pelletizers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29BPREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00Making granules
    • B29B9/16Auxiliary treatment of granules
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/78Preparation processes
    • C08G63/80Solid-state polycondensation
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/88Post-polymerisation treatment
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B5/00Drying solid materials or objects by processes not involving the application of heat
    • F26B5/08Drying solid materials or objects by processes not involving the application of heat by centrifugal treatment
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29BPREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00Making granules
    • B29B9/16Auxiliary treatment of granules
    • B29B2009/165Crystallizing granules
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29KINDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS
    • B29K2067/00Use of polyesters or derivatives thereof as moulding material
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G
    • C08J2367/00Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2367/02Polyesters derived from dicarboxylic acids and dihydroxy compounds
DE19691905677 1968-03-26 1969-02-05 Verfahren zum Kristallisieren von Polyestern Pending DE1905677A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US71608968 true 1968-03-26 1968-03-26

Publications (1)

Publication Number Publication Date
DE1905677A1 true true DE1905677A1 (de) 1969-10-09

Family

ID=24876698

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19691905677 Pending DE1905677A1 (de) 1968-03-26 1969-02-05 Verfahren zum Kristallisieren von Polyestern

Country Status (6)

Country Link
US (1) US3544525A (de)
BE (1) BE727929A (de)
DE (1) DE1905677A1 (de)
ES (1) ES363300A1 (de)
FR (1) FR2004707A1 (de)
GB (1) GB1257967A (de)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2941645B1 (de) * 1979-10-15 1981-03-19 Basf Ag Verfahren und Vorrichtung zum Heissgranulieren niedrigviskoser Polymerschmelzen mit engem Schmelzebereich
DE3213025A1 (de) * 1982-04-02 1983-10-06 Fischer Karl Ind Gmbh Verfahren und vorrichtung zur nachkondensation von polykondensaten
DE3314149A1 (de) * 1982-04-21 1983-11-03 Inventa Ag Verfahren zur herstellung von hochmolekularem polyester
EP0501274A2 (de) 1991-03-01 1992-09-02 Bayer Ag Verfahren zur Nachkristallisation von teilkristallinen Thermoplasten
WO1994001484A1 (de) * 1992-07-06 1994-01-20 Buehler Ag Verfahren zur reduktion des gelbwertes von nachkondensiertem polyestergranulat
DE4314162C1 (de) * 1993-04-29 1994-04-28 Rieter Automatik Gmbh Verfahren zur gleichzeitigen Trocknung und Kristallisation von kristallisationsfähigem thermoplastischem Kunststoff
EP0712703A3 (de) * 1994-11-21 1996-12-27 Sinco Eng Spa Verfahren zur Kristallisierung von Polyester-Harzen
EP0819716A2 (de) * 1996-07-18 1998-01-21 SINCO ENGINEERING S.p.A. Verbessertes Verfahren zur Produktion von Polyestern
EP0822214A2 (de) * 1996-08-01 1998-02-04 SINCO ENGINEERING S.p.A. Verbessertes Verfahren zur Produktion von Polyestern
WO2000024809A1 (de) * 1998-10-27 2000-05-04 Krupp Uhde Gmbh Verfahren und anlage zum herstellen von granulat aus polyfunktionellen carbonsäuren und alkoholen, insbesondere pet-granulat
FR2786494A1 (fr) * 1998-11-27 2000-06-02 Tergal Fibres Procede de fabrication de copolyesters poly(ethylene terephtalate)-poly(ethylene isophtalate)
WO2001012698A1 (de) * 1999-08-18 2001-02-22 Bühler AG Verfahren und vorrichtung zur herstellung von kristallisationsfähigem kunststoffmaterial
WO2003037588A1 (de) * 2001-10-29 2003-05-08 Markus Fellinger Verfahren und vorrichtung zur erhöhung der grenzviskosität von polyester
WO2004033174A1 (de) * 2002-10-04 2004-04-22 Kreyenborg Verwaltungen Und Beteiligungen Gmbh & Co. Kg Verfahren zur granulierung von kunststoffen
US8324339B2 (en) 2003-10-17 2012-12-04 Eastman Chemical Company Method and apparatus for thermally processing polyester pellets
EP2712881A1 (de) * 2012-09-26 2014-04-02 Bühler Thermal Processes AG Verfahren und Vorrichtung zur Direktkristallisation von Polymeren unter Inertgas
EP2121262B2 (de) 2006-12-12 2017-03-08 Polymetrix AG Verfahren und vorrichtung zur herstellung und behandlung von granulatkörnern
DE102015220887A1 (de) * 2015-10-26 2017-04-27 Coperion Gmbh Verfahren und Vorrichtung zum Trocknen von Kunststoff-Granulat
DE202016105613U1 (de) 2016-10-07 2018-01-09 Erwin Müller GmbH Aufnahme für eine Toilettenpapierrolle

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US4080317A (en) * 1970-10-23 1978-03-21 Ciba-Geigy Ag High molecular weight polycondensates from solid phase condensation
US3960817A (en) * 1970-10-23 1976-06-01 Ciba-Geigy Ag Solid phase polyester polycondensation
US3969324A (en) * 1972-01-13 1976-07-13 Monsanto Company Continuous process for drying, crystallizing and solid state polymerizing polyesters
US3949039A (en) * 1972-04-03 1976-04-06 Japan Steel Works, Ltd. Method for pelletizing synthetic resins having a high melting point
DE2559290B2 (de) * 1975-12-31 1979-08-02 Davy International Ag, 6000 Frankfurt
FR2355863B1 (de) * 1976-06-22 1980-01-18 Neu Ets
DE2642102C3 (de) * 1976-09-18 1984-10-04 Buehler-Miag Gmbh, 3300 Braunschweig, De
US4223128A (en) * 1978-05-16 1980-09-16 Celanese Corporation Process for preparing polyethylene terephthalate useful for beverage containers
US4258178A (en) * 1978-12-01 1981-03-24 Basf Aktiengesellschaft Discharging granular linear polycondensates
US4289871A (en) * 1980-03-27 1981-09-15 Allied Chemical Corporation Method to increase reactor capacity for polycondensation of polyesters
US4379912A (en) * 1982-08-12 1983-04-12 Eastman Kodak Company Method of making polyester prepolymers
US4446303A (en) * 1983-07-26 1984-05-01 Eastman Kodak Company Process for preparing high molecular weight polyesters
DE3522359A1 (de) * 1985-06-22 1987-01-02 Basf Ag Verfahren zum konfektionieren von kristallinen, organischen materialien
GB8712074D0 (en) * 1987-05-21 1987-06-24 Tioxide Group Plc Drying process
EP0379684B1 (de) * 1988-12-23 1993-10-27 Bühler GmbH Verfahren und Vorrichtung zum kontinuierlichen Kristallisieren von Polyestermaterial
US5408035A (en) * 1991-10-16 1995-04-18 Shell Oil Company Solid state polymerization
US5391355A (en) * 1993-07-21 1995-02-21 Eastman Chemical Company Vessel for the treatment of particulate materials
JP3626758B2 (ja) * 1995-01-20 2005-03-09 イー・アイ・デユポン・ドウ・ヌムール・アンド・カンパニー ポリ(エチレンテレフタレート)の製造
US5830982A (en) * 1995-01-20 1998-11-03 E. I. Du Pont De Nemours And Company Production of poly (ethylene terephthalate)
US5510454A (en) * 1995-01-20 1996-04-23 E. I. Du Pont De Nemours And Company Production of poly(ethylene terephthalate)
US5540868A (en) * 1995-01-20 1996-07-30 E. I. Du Pont De Nemours And Company Process for pellet formation from amorphous polyester
US5714262A (en) * 1995-12-22 1998-02-03 E. I. Du Pont De Nemours And Company Production of poly(ethylene terephthalate)
DE19902458A1 (de) * 1999-01-22 2000-07-27 Buehler Ag Vorrichtung und Verfahren zum Behandeln von Kunststoffmaterial
DE10042476A1 (de) * 2000-08-29 2002-03-28 Tessag Ind Anlagen Gmbh Verfahren und Vorrichtung zum Herstellen kugelförmiger Partikel aus einer Polymerschmelze
US20050167876A1 (en) * 2002-10-04 2005-08-04 Jan-Udo Kreyenborg Method for granulating plastics
RU2340634C2 (ru) * 2003-06-12 2008-12-10 Базелль Полиолефин Италия С.Р.Л. Пост-обработка полимерных гранул
EP1522295A3 (de) * 2003-10-08 2005-04-20 Pride Mobility Products, Corporation Antikippvorrichtung für Rollstuhl
US7157032B2 (en) * 2003-11-21 2007-01-02 Gala Industries, Inc. Method and apparatus for making crystalline PET pellets
DE202004002870U1 (de) * 2004-02-25 2004-05-19 Bauerfeind Ag Einlegesohle
DE102004015515A1 (de) * 2004-03-28 2004-09-16 Zimmer Ag Verfahren zur Herstellung von hochkondensiertem Polyestergranulat
EP1671773A1 (de) * 2004-12-20 2006-06-21 Total Petrochemicals Research Feluy Behandlungseinrichtung für Granulat
WO2006127698A3 (en) 2005-05-26 2007-01-18 Gala Inc Method and apparatus for making crystalline polymeric pellets and granules
US9032641B2 (en) 2005-05-26 2015-05-19 Gala Industries, Inc. Method and apparatus for making crystalline polymeric pellets and granules
DE102005026354A1 (de) * 2005-06-01 2006-12-07 Bkg Bruckmann & Kreyenborg Granuliertechnik Gmbh Verfahren zur thermischen Behandlung von Polyesterpellets, um eine Teilkristallisation zu erreichen
CN101495542A (zh) * 2005-08-22 2009-07-29 信赖工业有限公司 制备慢速结晶的聚酯树脂的改进方法
US20070149756A1 (en) * 2005-12-26 2007-06-28 Futura Polyesters Limited Compositions and methods of manufacturing polytrimethylene naphthalate
US20070265429A1 (en) * 2006-05-10 2007-11-15 Hudson Andrew S Use of a vibratory spiral elevator for crystallizing and/or drying of plastic pellets
US7638593B2 (en) 2006-05-24 2009-12-29 Eastman Chemical Company Crystallizer temperature control via fluid control
US7790840B2 (en) * 2006-05-24 2010-09-07 Eastman Chemical Company Crystallizing conveyor
US7638596B2 (en) * 2006-05-24 2009-12-29 Eastman Chemical Company Crystallizer temperature control via jacketing/insulation
DE102007027543A1 (de) * 2006-11-27 2008-05-29 Bühler AG Stranggranulationsverfahren und -vorrichtung sowie daraus hergestellte Granulate
DE102006058642A1 (de) * 2006-12-11 2008-06-12 Bühler AG Verfahren zur Herstellung homogen kristallisierter Polykondensatgranulate
DE102007040135A1 (de) * 2007-08-24 2009-02-26 Bkg Bruckmann & Kreyenborg Granuliertechnik Gmbh Verfahren zur Herstellung von Polyester-Granulaten aus hochviskosen Polyester-Schmelzen sowie Vorrichtung zur Herstellung der Polyester-Granulate
DE102007055242A1 (de) 2007-11-16 2009-05-20 Bühler AG Verfahren zur Kristallisation von kristallisierbaren Polymeren mit hoher Klebeneigung
DE102008062480A1 (de) * 2008-12-16 2010-06-17 Automatik Plastics Machinery Gmbh Verfahren zum Granulieren von Kunststoff mit hoher Erweichungstemperatur
US20110245452A1 (en) * 2010-03-31 2011-10-06 Uop Llc Integrated Underwater Melt Cutting, Solid-State Polymerization Process
CN105556236A (zh) * 2013-07-22 2016-05-04 英尼奥斯欧洲股份公司 用于清洁热交换器的方法

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US2850764A (en) * 1953-09-01 1958-09-09 Ici Ltd Process and apparatus for converting thermoplastic material to granular form
BE592181A (de) * 1955-12-22
US3075952A (en) * 1959-01-21 1963-01-29 Eastman Kodak Co Solid phase process for linear superpolyesters
US2975483A (en) * 1959-02-19 1961-03-21 Du Pont Process for producing polymeric pellets by cutting surface cooled strands
GB1066162A (en) * 1965-04-08 1967-04-19 Ici Ltd Poly(ethylene terephthalate)
US3405098A (en) * 1965-10-29 1968-10-08 Du Pont Process for preparing high viscosity linear condensation polyesters from partially polymerized glycol terephthalates
US3342782A (en) * 1967-01-30 1967-09-19 Eastman Kodak Co Polyester prepolymers and processes for their manufacture

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2941645B1 (de) * 1979-10-15 1981-03-19 Basf Ag Verfahren und Vorrichtung zum Heissgranulieren niedrigviskoser Polymerschmelzen mit engem Schmelzebereich
DE3213025A1 (de) * 1982-04-02 1983-10-06 Fischer Karl Ind Gmbh Verfahren und vorrichtung zur nachkondensation von polykondensaten
DE3314149A1 (de) * 1982-04-21 1983-11-03 Inventa Ag Verfahren zur herstellung von hochmolekularem polyester
EP0501274A2 (de) 1991-03-01 1992-09-02 Bayer Ag Verfahren zur Nachkristallisation von teilkristallinen Thermoplasten
WO1994001484A1 (de) * 1992-07-06 1994-01-20 Buehler Ag Verfahren zur reduktion des gelbwertes von nachkondensiertem polyestergranulat
DE4314162C1 (de) * 1993-04-29 1994-04-28 Rieter Automatik Gmbh Verfahren zur gleichzeitigen Trocknung und Kristallisation von kristallisationsfähigem thermoplastischem Kunststoff
US5714571A (en) * 1994-11-21 1998-02-03 Sinco Engineering S.P.A. Process for the crystallization of polyester resins
EP0712703A3 (de) * 1994-11-21 1996-12-27 Sinco Eng Spa Verfahren zur Kristallisierung von Polyester-Harzen
EP0819716A2 (de) * 1996-07-18 1998-01-21 SINCO ENGINEERING S.p.A. Verbessertes Verfahren zur Produktion von Polyestern
US5902864A (en) * 1996-07-18 1999-05-11 Sinco Engineering S.P.A. Process for the production of polyester resins
EP0819716A3 (de) * 1996-07-18 1998-02-11 SINCO ENGINEERING S.p.A. Verbessertes Verfahren zur Produktion von Polyestern
US6245863B1 (en) 1996-07-18 2001-06-12 Sinco Engineering S.P.A. Process for the production of polyester resins
EP0822214A3 (de) * 1996-08-01 1998-02-25 SINCO ENGINEERING S.p.A. Verbessertes Verfahren zur Produktion von Polyestern
EP0822214A2 (de) * 1996-08-01 1998-02-04 SINCO ENGINEERING S.p.A. Verbessertes Verfahren zur Produktion von Polyestern
WO2000024809A1 (de) * 1998-10-27 2000-05-04 Krupp Uhde Gmbh Verfahren und anlage zum herstellen von granulat aus polyfunktionellen carbonsäuren und alkoholen, insbesondere pet-granulat
WO2000032677A1 (fr) * 1998-11-27 2000-06-08 Tergal Fibres Procede de fabrication de copolyesters poly(ethylene terephtalate)-poly(ethylene isophtalate)
FR2786494A1 (fr) * 1998-11-27 2000-06-02 Tergal Fibres Procede de fabrication de copolyesters poly(ethylene terephtalate)-poly(ethylene isophtalate)
WO2001012698A1 (de) * 1999-08-18 2001-02-22 Bühler AG Verfahren und vorrichtung zur herstellung von kristallisationsfähigem kunststoffmaterial
WO2003037588A1 (de) * 2001-10-29 2003-05-08 Markus Fellinger Verfahren und vorrichtung zur erhöhung der grenzviskosität von polyester
US7828538B2 (en) 2001-10-29 2010-11-09 Markus Fellinger Method and apparatus for increasing an intrinsic viscosity of polyester
WO2004033174A1 (de) * 2002-10-04 2004-04-22 Kreyenborg Verwaltungen Und Beteiligungen Gmbh & Co. Kg Verfahren zur granulierung von kunststoffen
US8324339B2 (en) 2003-10-17 2012-12-04 Eastman Chemical Company Method and apparatus for thermally processing polyester pellets
EP2121262B2 (de) 2006-12-12 2017-03-08 Polymetrix AG Verfahren und vorrichtung zur herstellung und behandlung von granulatkörnern
EP2712881A1 (de) * 2012-09-26 2014-04-02 Bühler Thermal Processes AG Verfahren und Vorrichtung zur Direktkristallisation von Polymeren unter Inertgas
US9943817B2 (en) 2012-09-26 2018-04-17 Polymetrix Ag Process and apparatus for direct crystallization of polymers under inert gas
DE102015220887A1 (de) * 2015-10-26 2017-04-27 Coperion Gmbh Verfahren und Vorrichtung zum Trocknen von Kunststoff-Granulat
DE202016105613U1 (de) 2016-10-07 2018-01-09 Erwin Müller GmbH Aufnahme für eine Toilettenpapierrolle

Also Published As

Publication number Publication date Type
BE727929A (de) 1969-08-05 grant
US3544525A (en) 1970-12-01 grant
GB1257967A (de) 1971-12-22 application
FR2004707A1 (de) 1969-11-28 application
ES363300A1 (es) 1970-12-16 application

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