FR2297773A1 - Dispositif de soudage et de coupage pour machines a emballer - Google Patents

Dispositif de soudage et de coupage pour machines a emballer

Info

Publication number
FR2297773A1
FR2297773A1 FR7601118A FR7601118A FR2297773A1 FR 2297773 A1 FR2297773 A1 FR 2297773A1 FR 7601118 A FR7601118 A FR 7601118A FR 7601118 A FR7601118 A FR 7601118A FR 2297773 A1 FR2297773 A1 FR 2297773A1
Authority
FR
France
Prior art keywords
welding
cutting device
packaging machines
packaging
machines
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
FR7601118A
Other languages
English (en)
Other versions
FR2297773B1 (fr
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.)
SITUNO HOLDING
Original Assignee
SITUNO HOLDING
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 SITUNO HOLDING filed Critical SITUNO HOLDING
Publication of FR2297773A1 publication Critical patent/FR2297773A1/fr
Application granted granted Critical
Publication of FR2297773B1 publication Critical patent/FR2297773B1/fr
Granted legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/80General aspects of machine operations or constructions and parts thereof
    • B29C66/82Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/822Transmission mechanisms
    • B29C66/8225Crank mechanisms
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/22Heated wire resistive ribbon, resistive band or resistive strip
    • B29C65/221Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip
    • B29C65/222Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip comprising at least a single heated wire
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/74Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/743Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/74Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/743Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc
    • B29C65/7433Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc the tool being a wire
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/05Particular design of joint configurations
    • B29C66/10Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112Single lapped joints
    • B29C66/1122Single lap to lap joints, i.e. overlap joints
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/40General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43Joining a relatively small portion of the surface of said articles
    • B29C66/431Joining the articles to themselves
    • B29C66/4312Joining the articles to themselves for making flat seams in tubular or hollow articles, e.g. transversal seams
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/80General aspects of machine operations or constructions and parts thereof
    • B29C66/82Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/824Actuating mechanisms
    • B29C66/8242Pneumatic or hydraulic drives
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/80General aspects of machine operations or constructions and parts thereof
    • B29C66/83General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8351Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws
    • B29C66/83541Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws flying jaws, e.g. jaws mounted on crank mechanisms or following a hand over hand movement
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/80General aspects of machine operations or constructions and parts thereof
    • B29C66/83General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8351Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws
    • B29C66/83541Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws flying jaws, e.g. jaws mounted on crank mechanisms or following a hand over hand movement
    • B29C66/83543Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws flying jaws, e.g. jaws mounted on crank mechanisms or following a hand over hand movement cooperating flying jaws
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/80General aspects of machine operations or constructions and parts thereof
    • B29C66/84Specific machine types or machines suitable for specific applications
    • B29C66/841Machines or tools adaptable for making articles of different dimensions or shapes or for making joints of different dimensions
    • B29C66/8412Machines or tools adaptable for making articles of different dimensions or shapes or for making joints of different dimensions of different length, width or height
    • B29C66/84123Machines or tools adaptable for making articles of different dimensions or shapes or for making joints of different dimensions of different length, width or height of different height
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/80General aspects of machine operations or constructions and parts thereof
    • B29C66/84Specific machine types or machines suitable for specific applications
    • B29C66/849Packaging machines
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65BMACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10Applying or generating heat or pressure or combinations thereof
    • B65B51/26Devices specially adapted for producing transverse or longitudinal seams in webs or tubes
    • B65B51/30Devices, e.g. jaws, for applying pressure and heat, e.g. for subdividing filled tubes
    • B65B51/303Devices, e.g. jaws, for applying pressure and heat, e.g. for subdividing filled tubes reciprocating along only one axis
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65BMACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B61/00Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages
    • B65B61/04Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for severing webs, or for separating joined packages
    • B65B61/06Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for severing webs, or for separating joined packages by cutting
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/80General aspects of machine operations or constructions and parts thereof
    • B29C66/82Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/822Transmission mechanisms
    • B29C66/8223Worm or spindle mechanisms

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)
  • Package Closures (AREA)
FR7601118A 1975-01-17 1976-01-16 Dispositif de soudage et de coupage pour machines a emballer Granted FR2297773A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT19387/75A IT1028456B (it) 1975-01-17 1975-01-17 Dispositivo di saldatura e taglio per macchine da imballaggio

Publications (2)

Publication Number Publication Date
FR2297773A1 true FR2297773A1 (fr) 1976-08-13
FR2297773B1 FR2297773B1 (fr) 1982-03-19

Family

ID=11157250

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7601118A Granted FR2297773A1 (fr) 1975-01-17 1976-01-16 Dispositif de soudage et de coupage pour machines a emballer

Country Status (7)

Country Link
US (1) US4019307A (fr)
CA (1) CA1046395A (fr)
DE (1) DE2601482A1 (fr)
FR (1) FR2297773A1 (fr)
GB (1) GB1496312A (fr)
IT (1) IT1028456B (fr)
NL (1) NL183639C (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0297636A2 (fr) * 1987-06-03 1989-01-04 SITMA S.p.A. Dispositif pour varier l'écartement entre les deux mâchoires de soudage dans une machine d'empaquetage
EP0304979A2 (fr) * 1987-08-27 1989-03-01 SITMA S.p.A. Machine d'emballage pour l'emballage continu de produits ayant une hauteur variable
FR2645117A1 (fr) * 1989-04-04 1990-10-05 Ulma S Coop Ameliorations apportees aux machines de fermeture hermetique d'emballages
EP0304978B1 (fr) * 1987-08-27 1993-09-01 SITMA S.p.A. Machine d'emballage pour l'emballage continu de produits individuels, ou de groupes de produits de chevauchant ayant une hauteur variable

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4185443A (en) * 1976-10-22 1980-01-29 Weldotron Corporation Bag sealing machine
US4219988A (en) * 1977-10-11 1980-09-02 Shanklin Corporation Automatic high-speed wrapping machine
US4141196A (en) * 1977-10-11 1979-02-27 Oliver Machinery Company Seal wrapping machine
DE3367190D1 (en) * 1982-12-07 1986-12-04 Claus K Pfankuch Device for wrapping articles with a plastic sheet or the like
CH660161A5 (de) * 1983-05-31 1987-03-31 Ilapak Res & Dev Sa Schlauchbeutelmaschine mit verschliesswerkzeugen.
US5165221A (en) * 1991-07-02 1992-11-24 Great Lakes Corporation Adjustable film forming apparatus
DE4418516A1 (de) * 1994-05-27 1995-11-30 Womako Masch Konstr Folienverpackungseinrichtung zum Einschweißen von bewegten Gegenständen
DK172770B1 (da) * 1996-04-17 1999-07-12 Tiromat Kromer & Grebe Gmbh & Emballeringsmaskine af flowpacking-typen med værktøjskæbejustering
US6247293B1 (en) 1998-11-03 2001-06-19 Klockner Bartelt, Inc. Modular packaging machine with web tension control
US6272815B1 (en) 1998-11-03 2001-08-14 Klockner-Bartelt, Inc. Servo-controlled pouch making apparatus
US6629400B1 (en) * 2000-01-07 2003-10-07 Kimberly-Clark Worldwide, Inc. Method and apparatus for sealing packages
ITBO20030779A1 (it) * 2003-12-23 2005-06-24 Pentatec S R L Dispositivo per l'alimentazione e il taglio di film in macchine condizionatrici di prodotti
DE102006006601A1 (de) * 2006-02-10 2007-08-16 Edmund Mundorf Vorrichtung zum Bearbeiten einer Materialbahn
EP2412637B1 (fr) * 2010-07-29 2013-05-01 MULTIVAC Sepp Haggenmüller GmbH & Co KG Machine d'emballage dotée de plusieurs stations de travail
DE102011075532A1 (de) * 2011-05-09 2012-11-15 Kallfass Verpackungsmaschinen Gmbh Verpackungsmaschine und Verfahren zum Verpacken von Gegenständen
ITBO20130534A1 (it) * 2013-09-27 2015-03-28 Ct Pack Srl Macchina e metodo di confezionamento di articoli.
US9809341B2 (en) * 2013-10-24 2017-11-07 Sealed Air Corporation (Us) Counterbalanced servo end seal carriages
CN104691017B (zh) * 2015-01-26 2017-11-21 瀚寅(苏州)新材料科技有限公司 塑料膜热封口装置
CN104691845B (zh) * 2015-01-26 2017-07-07 瀚寅(苏州)新材料科技有限公司 一种全自动塑料膜热封口切断装置及其热封切方法
CN104787396A (zh) * 2015-05-11 2015-07-22 怡富包装(深圳)有限公司 一种包装机的封口装置
DE102017119296A1 (de) * 2017-08-23 2019-02-28 Haver & Boecker Ohg Verpackungsanlage und Verfahren zum Verpacken von Objekten
CN109080910A (zh) * 2018-09-05 2018-12-25 嘉善睿逸电子科技有限公司 一种计数包装装置
CN109623891B (zh) * 2018-12-25 2020-07-07 福州大学 一种湿纸巾外包装双工位交替热封剪切机构及其工作方法
CN109625480B (zh) * 2019-01-23 2024-02-20 邓十匀 面膜折叠包装机

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1205886B (de) * 1959-09-16 1965-11-25 Nat Dairy Prod Corp Verpackungsmaschine zum schlauchfoermigen Verpacken
US3237371A (en) * 1962-03-29 1966-03-01 Fmc Corp Machine for operating on moving workpiece
FR2033102A5 (fr) * 1969-02-26 1970-11-27 Sitma Italiana Macch
GB1281964A (en) * 1969-05-27 1972-07-19 Mario Cavanna Apparatus for transversely welding tubular plastics strip material filled with fluidic material, to form individual sachets
DE2113270A1 (de) * 1971-03-19 1972-10-26 Hesser Ag Maschf Querschweissvorrichtung insbesondere fuer eine Einwickelmaschine

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH421799A (de) * 1963-06-24 1966-09-30 Soag Machine Tools Ltd Verpackungsmaschine
US3438173A (en) * 1965-03-17 1969-04-15 Shozo Omori Method for automatically packaging solid articles and apparatus therefor
CH512383A (de) * 1969-08-26 1971-09-15 Ferag Ag Einrichtung zum Behandeln von Stückgütern

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1205886B (de) * 1959-09-16 1965-11-25 Nat Dairy Prod Corp Verpackungsmaschine zum schlauchfoermigen Verpacken
US3237371A (en) * 1962-03-29 1966-03-01 Fmc Corp Machine for operating on moving workpiece
FR2033102A5 (fr) * 1969-02-26 1970-11-27 Sitma Italiana Macch
GB1281964A (en) * 1969-05-27 1972-07-19 Mario Cavanna Apparatus for transversely welding tubular plastics strip material filled with fluidic material, to form individual sachets
DE2113270A1 (de) * 1971-03-19 1972-10-26 Hesser Ag Maschf Querschweissvorrichtung insbesondere fuer eine Einwickelmaschine

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0297636A2 (fr) * 1987-06-03 1989-01-04 SITMA S.p.A. Dispositif pour varier l'écartement entre les deux mâchoires de soudage dans une machine d'empaquetage
EP0297636A3 (en) * 1987-06-03 1989-01-11 Sitma Societa Italiana Macchine Automatiche S.P.A. Device for varying the opening between the welding element and the counter-welding element in packaging machines
EP0304979A2 (fr) * 1987-08-27 1989-03-01 SITMA S.p.A. Machine d'emballage pour l'emballage continu de produits ayant une hauteur variable
EP0304978B1 (fr) * 1987-08-27 1993-09-01 SITMA S.p.A. Machine d'emballage pour l'emballage continu de produits individuels, ou de groupes de produits de chevauchant ayant une hauteur variable
EP0304979B1 (fr) * 1987-08-27 1993-10-27 SITMA S.p.A. Machine d'emballage pour l'emballage continu de produits ayant une hauteur variable
FR2645117A1 (fr) * 1989-04-04 1990-10-05 Ulma S Coop Ameliorations apportees aux machines de fermeture hermetique d'emballages

Also Published As

Publication number Publication date
DE2601482C2 (fr) 1987-01-22
DE2601482A1 (de) 1976-07-22
NL183639C (nl) 1988-12-16
FR2297773B1 (fr) 1982-03-19
US4019307A (en) 1977-04-26
CA1046395A (fr) 1979-01-16
IT1028456B (it) 1979-01-30
GB1496312A (en) 1977-12-30
NL183639B (nl) 1988-07-18
NL7600448A (nl) 1976-07-20

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