ES423632A1 - Process for producing polytetrafluorethylene tubes - Google Patents

Process for producing polytetrafluorethylene tubes

Info

Publication number
ES423632A1
ES423632A1 ES423632A ES423632A ES423632A1 ES 423632 A1 ES423632 A1 ES 423632A1 ES 423632 A ES423632 A ES 423632A ES 423632 A ES423632 A ES 423632A ES 423632 A1 ES423632 A1 ES 423632A1
Authority
ES
Spain
Prior art keywords
mandrel
ptfe
tube
polytetrafluorethylene
tubes
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.)
Expired
Application number
ES423632A
Other languages
Spanish (es)
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.)
STEIGER ENGINEERING AG
Original Assignee
STEIGER ENGINEERING AG
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 STEIGER ENGINEERING AG filed Critical STEIGER ENGINEERING AG
Publication of ES423632A1 publication Critical patent/ES423632A1/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F16L9/16—Rigid pipes wound from sheets or strips, with or without reinforcement
    • 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
    • B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
    • 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
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/56—Winding and joining, e.g. winding spirally
    • B29C53/58—Winding and joining, e.g. winding spirally helically
    • B29C53/581—Winding and joining, e.g. winding spirally helically using sheets or strips consisting principally of plastics material
    • 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
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/56—Winding and joining, e.g. winding spirally
    • B29C53/58—Winding and joining, e.g. winding spirally helically
    • B29C53/583—Winding and joining, e.g. winding spirally helically for making tubular articles with particular features
    • 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
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/56—Winding and joining, e.g. winding spirally
    • B29C53/58—Winding and joining, e.g. winding spirally helically
    • B29C53/583—Winding and joining, e.g. winding spirally helically for making tubular articles with particular features
    • B29C53/585—Winding and joining, e.g. winding spirally helically for making tubular articles with particular features the cross-section varying along their axis, e.g. tapered, with ribs, or threads, with socket-ends
    • 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
    • B29C57/00—Shaping of tube ends, e.g. flanging, belling or closing; Apparatus therefor, e.g. collapsible mandrels
    • 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
    • B29C57/00—Shaping of tube ends, e.g. flanging, belling or closing; Apparatus therefor, e.g. collapsible mandrels
    • B29C57/005—Shaping of tube ends, e.g. flanging, belling or closing; Apparatus therefor, e.g. collapsible mandrels the end of an internal lining
    • 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
    • B29C48/001—Combinations of extrusion moulding with other shaping 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
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
    • 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
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0021—Combinations of extrusion moulding with other shaping operations combined with joining, lining or laminating
    • 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
    • B29C48/07—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
    • B29C48/03—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
    • 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
    • B29C48/13—Articles with a cross-section varying in the longitudinal direction, e.g. corrugated pipes
    • 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
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • B29C48/151—Coating hollow articles
    • 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
    • B29C48/19—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their edges
    • 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
    • B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
    • B29C71/02—Thermal after-treatment
    • 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
    • B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
    • B29K2027/12—Use of polyvinylhalogenides or derivatives thereof as moulding material containing fluorine
    • B29K2027/18—PTFE, i.e. polytetrafluorethene, e.g. ePTFE, i.e. expanded polytetrafluorethene
    • 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
    • B29K2105/25—Solid
    • B29K2105/251—Particles, powder or granules
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/22—Tubes or pipes, i.e. rigid

Abstract

Procedure for making a polytetrafluoroethylene (PTFE) tube that can be deformed in a collar at least one of its ends, a procedure in which a raw PTFE tape is wound on a mandrel, characterized in that: approximately 10 to 100 layers of PTFE tape obtained by thick pasting and calendering and having a thickness of about 5 to 20/100 of a millimeter; The tape thus wound on the mandrel is brought to a temperature above its gelling temperature and below about 380 to 400ºC, for a time sufficient to cause the PTFE gelation; the tube and mandrel are cooled; and the mandrel located inside the tube is removed. (Machine-translation by Google Translate, not legally binding)
ES423632A 1973-02-27 1974-02-26 Process for producing polytetrafluorethylene tubes Expired ES423632A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH282973A CH562098A5 (en) 1973-02-27 1973-02-27

Publications (1)

Publication Number Publication Date
ES423632A1 true ES423632A1 (en) 1977-01-01

Family

ID=4242528

Family Applications (1)

Application Number Title Priority Date Filing Date
ES423632A Expired ES423632A1 (en) 1973-02-27 1974-02-26 Process for producing polytetrafluorethylene tubes

Country Status (9)

Country Link
JP (1) JPS5925647B2 (en)
BE (1) BE811436A (en)
CH (1) CH562098A5 (en)
DE (1) DE2409178C2 (en)
ES (1) ES423632A1 (en)
FR (1) FR2218987B1 (en)
GB (1) GB1466183A (en)
IT (1) IT1008971B (en)
NL (1) NL183230C (en)

Families Citing this family (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4478665A (en) * 1980-11-06 1984-10-23 W. L. Gore & Associates, Inc. Method for manufacturing highly porous, high strength PTFE articles
EP0059619A1 (en) * 1981-02-27 1982-09-08 Junkosha Co. Ltd. Method of manufacturing porous tetrafluoroethylene tubes
DE3214447C2 (en) * 1982-04-20 1994-05-11 Eilentropp Hew Kabel Unsintered wrapping tape of polytetrafluoroethylene
US4478898A (en) * 1982-06-04 1984-10-23 Junkosha Co., Ltd. Laminated porous polytetrafluoroethylene tube and its process of manufacture
CA1198973A (en) * 1982-08-23 1986-01-07 The Dow Chemical Company Preparation of flanged plastic lined pipe and apparatus therefor
GB8918702D0 (en) * 1989-08-16 1989-09-27 Shell Int Research Process for the preparation of random solution copolymers of conjugated dienes and vinyl aromatic compounds
FR2662632B1 (en) * 1990-05-30 1992-10-30 Plastic Omnium Cie PROCESS FOR PRODUCING THIN TUBES IN FLUORINATED RESIN, IN PARTICULAR IN POLYTETRAFLUORETHYLENE.
JPH0641167B2 (en) * 1990-06-23 1994-06-01 ニチアス株式会社 Manufacturing method of tetrafluoroethylene resin pipe
DE4103540C2 (en) * 1991-02-06 1995-03-09 Eilentropp Hew Kabel Method and device for producing a winding tape from sinterable plastics
FR2679484B1 (en) * 1991-07-26 1995-02-17 Plastic Omnium Cie PROCESS FOR THE PRODUCTION OF FLUORINATED RESIN TUBES, IN PARTICULAR POLYTETRAFLUORETHYLENE.
FR2711090B1 (en) * 1993-10-15 1996-01-05 Plastic Omnium Cie Process for manufacturing fluorinated resin tubes incorporating fibers.
DE4341859A1 (en) * 1993-12-08 1995-06-29 Plastic Omnium Gmbh Process and device for the production of diffusion-proof multilayer plastic pipes
DE19546511A1 (en) 1995-12-13 1997-06-19 Eilentropp Kg Polymer mixture and its use for high temperature resistant fasteners and sealing elements
DE19547031A1 (en) 1995-12-15 1997-06-19 Eilentropp Kg Elongated tubular shell
IT1284066B1 (en) * 1996-06-25 1998-05-08 Camillo Scotto PROCEDURE AND SYSTEM FOR THE PRODUCTION OF RECYCLED THERMOPLASTIC RESIN TUBES
EP0990506A1 (en) * 1998-09-29 2000-04-05 O'Connell, Michael Production of lined pipes
DE10152604A1 (en) * 2001-10-25 2003-05-08 Drossbach Gmbh & Co Kg Method and device for producing a reinforced sleeve on an extruded plastic pipe made of thermoplastic material
DE10201833B4 (en) * 2002-01-18 2012-06-21 Hew-Kabel Gmbh Process for producing a winding tape of unsintered polytetrafluoroethylene
WO2005118292A2 (en) 2004-05-27 2005-12-15 Nomaco, Inc. Foam welding and profile manufacturing system
FR2903756B1 (en) * 2006-07-13 2008-12-12 Plastic Omnium Cie NOISE ATTENUATOR FOR HYDRAULIC FLUID DRIVE, ARTICLE COMPRISING THIS ATTENUATOR, CONDUCT COMPRISING THIS ARTICLE AND METHOD OF ASSEMBLY.
DE102011055262A1 (en) * 2011-11-11 2013-05-16 Leoni Kabel Holding Gmbh Method and device for producing a winding band
CN103174884A (en) * 2013-03-26 2013-06-26 赵炜 Antistatic polytetrafluoroethylene lining anti-corrosion pipeline and manufacturing method thereof
EP3334961B1 (en) * 2015-09-17 2022-12-14 Teadit N.A., Inc. Method for manufacturing a spiral-wound ptfe gasket
CN106838482A (en) * 2017-02-08 2017-06-13 江苏龙麒橡塑有限公司 A kind of buried anti-electrostatic fire retardant composite petroleum pipeline
CN109822930B (en) * 2018-12-31 2021-03-12 枞阳县中邦科技信息咨询有限公司 Production process of fluorine lining pipeline of fluoroplastic pump
CN111823622A (en) * 2020-05-18 2020-10-27 泰州市季氟隆塑胶制品有限公司 Polytetrafluoroethylene pipe and preparation method thereof
CN112361093B (en) * 2020-11-17 2022-09-13 重庆四通八达管业有限公司 Implanted early-warning reinforced basalt fiber composite pipeline and preparation process
CN114230835B (en) * 2021-11-04 2023-04-14 山东东岳高分子材料有限公司 Low-permeability polytetrafluoroethylene tube and preparation method thereof

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2941911A (en) * 1955-11-15 1960-06-21 Du Pont Method of forming continuous structures of polytetrafluoroethylene
GB967808A (en) * 1961-12-22 1964-08-26 Compoflex Co Ltd Improvements in or relating to flexible tubing
DE1779905B2 (en) * 1962-05-22 1975-09-18 Raybestos-Manhattan, Inc., Manheim, Pa. (V.St.A.) Tetrafluoroethylene polymer tube
CH550675A (en) * 1971-04-29 1974-06-28 Polygest Ag PROCESS FOR MANUFACTURING COATINGS FROM POLYTETRAFLUORAETHYLENE AND PRODUCTS MANUFACTURED BY THIS PROCESS.

Also Published As

Publication number Publication date
NL183230B (en) 1988-04-05
DE2409178C2 (en) 1984-08-30
GB1466183A (en) 1977-03-02
IT1008971B (en) 1976-11-30
DE2409178A1 (en) 1974-08-29
FR2218987A1 (en) 1974-09-20
JPS5024368A (en) 1975-03-15
CH562098A5 (en) 1975-05-30
JPS5925647B2 (en) 1984-06-20
FR2218987B1 (en) 1976-10-08
BE811436A (en) 1974-08-22
NL7402603A (en) 1974-08-29
NL183230C (en) 1988-09-01

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