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CH652965A5 - Welding method for the leaktight closure of thermoplastic containers, particularly containers intended to contain foodstuffs - Google Patents

Welding method for the leaktight closure of thermoplastic containers, particularly containers intended to contain foodstuffs Download PDF

Info

Publication number
CH652965A5
CH652965A5 CH2287/83A CH228783A CH652965A5 CH 652965 A5 CH652965 A5 CH 652965A5 CH 2287/83 A CH2287/83 A CH 2287/83A CH 228783 A CH228783 A CH 228783A CH 652965 A5 CH652965 A5 CH 652965A5
Authority
CH
Switzerland
Prior art keywords
welding
weld line
boss
cover sheet
containers
Prior art date
Application number
CH2287/83A
Other languages
French (fr)
Inventor
Laszlo Sandor Horvath
Original Assignee
Altradec 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 Altradec Ag filed Critical Altradec Ag
Priority to CH2287/83A priority Critical patent/CH652965A5/en
Publication of CH652965A5 publication Critical patent/CH652965A5/en

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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint 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
    • B29C66/112—Single lapped joints
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/131—Single flanged joints, i.e. one of the parts to be joined being rigid and flanged in the joint area
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/534—Joining single elements to open ends of tubular or hollow articles or to the ends of bars
    • B29C66/5346—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat
    • B29C66/53461—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat joining substantially flat covers and/or substantially flat bottoms to open ends of container bodies
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/737—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined
    • B29C66/7373—Joining soiled or oxidised materials
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81413—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being non-symmetrical
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81427—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B7/00—Closing containers or receptacles after filling
    • B65B7/16—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons
    • B65B7/28—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons by applying separate preformed closures, e.g. lids, covers
    • B65B7/2842—Securing closures on containers
    • B65B7/2878—Securing closures on containers by heat-sealing
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/04—Dielectric heating, e.g. high-frequency welding, i.e. radio frequency welding of plastic materials having dielectric properties, e.g. PVC
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8126—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/81265—Surface properties, e.g. surface roughness or rugosity
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81415—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled
    • B29C66/81419—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled and flat

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Package Closures (AREA)

Abstract

In the welding method, the portion of molten material (8) is displaced during the welding cycle towards the upper face (3) of the edge of the container (2) and the portion (8) is then forced to flow laterally, on either side of the axis (5) of the welding line, under the cover sheet (4), so that it rids the welding line of any trace of foreign material which might interrupt the welding line. <IMAGE>

Description

       

  
 

**ATTENTION** debut du champ DESC peut contenir fin de CLMS **.

 



   REVENDICATIONS
   1.    Procédé de soudage pour la fermeture étanche de récipients en matière thermoplastique à   l'aide    d'une feuille de couverture,   caracté-    risé en ce qu'on déplace une portion de matière fondue lors du cycle de soudage vers la face supérieure (3) du bord du récipient (2) et qu'on force ensuite ladite portion (8) à s'écouler latéralement, de part et d'autre de l'axe (5) de la ligne de soudure, sous la feuille de couverture (4), de façon qu'elle débarrasse la ligne de soudure de toute trace de matériau étranger pouvant interrompre la ligne de soudure.



   2. Procédé selon la revendication 1, caractérisé en ce que la fusion de la portion de matière (8) s'effectue à l'aide de tout moyen assurant la fusion quasi simultanée de la portion de matière située dans l'axe (5) de la ligne de soudure, à l'exception de la matière en contact direct avec les surfaces comparativement froides des instruments de soudage.



   3. Procédé selon l'une des revendications 1 ou 2, caractérisé en ce que la fusion de la portion de matière (8) s'effectue à l'aide d'ultrasons ou d'impulsions électromagnétiques à haute fréquence.



   4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce qu'on serre pendant la fusion la portion du récipient et la portion de la feuille de couverture destinées à former ensemble la fermeture étanche entre une enclume (1) portant un bossage (6) et une tête de soudage (7) de façon qu'au moins une partie et au maximum la totalité du bossage (6) soit enfoncée dans la matière.



   5. Dispositif pour la mise en oeuvre du procédé selon la revendication 1, caractérisé en ce qu'il comprend une enclume (1) présentant un bossage (6) et une tête de soudage (7), mobiles l'une par rapport à l'autre, l'élément mobile se déplaçant selon l'axe (5) de la ligne de soudure.



   6. Dispositif selon la revendication 5, caractérisé en ce que la tête de soudage (7) représente l'élément mobile.



   7. Dispositif selon l'une des revendications 5 et 6, caractérisé en ce que la surface de la tête de soudage (7) en contact avec la feuille de couverture (4) est plane.



   L'invention a pour objet un procédé permettant de réaliser par soudage la fermeture hermétique de récipients en matière thermoplastique, destinés à contenir des matières sensibles notamment à l'intrusion de bactéries, de liquides ou de gaz, tel l'oxygène par exemple.



   Il est quasi inévitable, notamment lorsque les opérations de conditionnement des aliments s'effectuent mécaniquement, que des particules de matière alimentaire ou autre soient déposées sur la zone prévue pour la soudure. Lors des opérations de contrôle subséquentes, de telles imperfections peuvent être alors détectées et provoquent ainsi le rejet de nombreux récipients, par conséquent une proportion élevée des pertes lors du conditionnement.



   L'invention a précisément pour but de remédier à ces inconvénients.



   A cet effet, le procédé selon l'invention est conçu tel que défini par la revendication 1.



   Le procédé de la présente invention présente la particularité de permettre l'obtention d'une ligne de soudure totalement exempte de toute trace de produit contaminant qui, par sa présence, aurait créé l'interruption de ladite ligne de soudure et, par conséquent, favorisé la pénétration de produits, micro-organismes, liquides ou gaz non désirés.



   Le procédé est particulièrement bien adapté   â    la fermeture étanche, à l'aide d'une feuille de couverture, de récipients en matière thermoplastique destinés à recevoir des produits sensibles, notamment des aliments, et dont le bord destiné à être soudé à la feuille de couverture aurait été au préalable souillé par des traces ou particules alimentaires au cours de la phase de remplissage.



   Une mise en oeuvre du procédé selon l'invention sera décrite, à titre d'exemple, en se référant au dessin annexé, dans lequel:
 la fig. 1 est une vue en coupe illustrant le dispositif de soudage avant l'opération de soudage proprement dite,
 la fig. 2 est une vue en coupe illustrant le fonctionnement du dispositif selon l'invention,
 la fig. 3 est une vue en coupe illustrant le dispositif selon l'invention une fois l'opération de soudage terminée.



   La fusion de la portion de matière thermoplastique 8 peut s'effectuer par tout moyen assurant la fusion quasi simultanée de la portion de matière située dans l'axe 5 de la ligne de soudure, à l'exception de la matière en contact direct avec les surfaces comparativement froides des instruments de soudage.



   On peut avantageusement effectuer cette fusion à l'aide d'ultrasons ou d'impulsions électromagnétiques a haute fréquence par exemple (micro-ondes).



   Le dispositif servant à la mise en   oeuvre    du procédé de soudage comprend une enclume 1 pourvue d'un bossage 6. Au contact de ce bossage vient se placer le bord du récipient 2 auquel se superpose la feuille de couverture 4. Cette dernière se trouve en contact avec la tête de soudage 7, dont la surface est essentiellement plane et dépourvue d'aspérités majeures. Les éléments 7 et   I    sont mobiles   Fun    par rapport à l'autre. La tête de soudage 7 est de préférence l'élément mobile du dispositif; elle se déplace selon l'axe 5 de la ligne de soudure, comme indiqué par la flèche sur la fig. 2, le plus généralement verticalement.



     Lw    fusion de la portion de matière une fois réalisée à l'aide de moyens connus tels ceux décrits ci-dessus, la pression exercée par la tête de soudure 7 sur l'ensemble 2 et 4 provoque l'enfoncement du bossage 6 de l'enclume   I    dans le bord du récipient 2. La portion de matière fondue 8 est en un premier temps progressivement forcée vers la face supérieure 3, c'est-à-dire vers le haut. Une fois parvenue   à à cette dite face supérieure 3, sous l'effet de la pression exercée par la    tête 7, la masse de matière fondue s'écoule à l'interface, de part et d'autre de l'axe 5, le plus généralement horizontalement. Cette situation est illustrée par la fig. 2.



   Au cours de ce déplacement de matière fondue, la surface de la feuille de couverture 4 n'est pratiquement pas altérée, cette dernière demeurant relativement froide par rapport à la température de la portion de matière 8. Toute trace de particule étrangère ou de matière alimentaire est par conséquent entraînée lors de ce déplacement de matière fondue.



   La profondeur de pénétration du bossage 6 dans le bord du récipient 2 détermine la quantité de matière ainsi déplacée lors du procédé de soudage. Elle peut être aisément contrôlée. La hauteur dudit bossage 6, en outre, détermine la profondeur de pénétration maximale.



   Une fois les opérations terminées et la matière fondue refroidie, le bord du récipient 2 se retrouve dans un état structurel voisin de celui de l'origine, l'excédent de matière thermoplastique déplacé durant le procédé constituant désormais une ligne de soudure ininterrompue. Une telle ligne de soudure peut alors efficacement s'opposer à toute pénétration d'élément contaminant étranger tel que micro-organisme, liquide ou gaz.



   Pour la réalisation de la fermeture étanche de récipients par le procédé de soudage selon l'invention, on utilisera le plus généralement des récipients dont le bord destiné au soudage présente une épaisseur supérieure a la hauteur du bossage 6, et également supérieure à l'épaisseur de la feuille de couverture 4. Il est important de veiller à ce que l'épaisseur de ladite feuille 4 ne soit pas diminuée de façon importante au cours des opérations, ni que sa structure soit altérée.



   Le procédé de l'invention a l'avantage de n'affecter au plus qu'une très faible portion de la feuille de couverture 4, et cela de manière parfaitement contrôlable. 



  
 

** ATTENTION ** start of the DESC field may contain end of CLMS **.

 



   CLAIMS
   1. Welding method for sealing of thermoplastic containers using a cover sheet, characterized in that a portion of molten material is displaced during the welding cycle towards the upper face (3 ) from the edge of the container (2) and then forcing said portion (8) to flow laterally, on either side of the axis (5) of the weld line, under the cover sheet ( 4), so that it rids the weld line of all traces of foreign material which can interrupt the weld line.



   2. Method according to claim 1, characterized in that the melting of the portion of material (8) is carried out using any means ensuring the almost simultaneous melting of the portion of material located in the axis (5) of the weld line, except for material in direct contact with the comparatively cold surfaces of the welding instruments.



   3. Method according to one of claims 1 or 2, characterized in that the fusion of the portion of material (8) is carried out using ultrasound or high frequency electromagnetic pulses.



   4. Method according to one of claims 1 to 3, characterized in that during the fusion tightens the portion of the container and the portion of the cover sheet intended to form together the seal between an anvil (1) carrying a boss (6) and a welding head (7) so that at least part and at most the entire boss (6) is pressed into the material.



   5. Device for implementing the method according to claim 1, characterized in that it comprises an anvil (1) having a boss (6) and a welding head (7), movable relative to the other, the movable element moving along the axis (5) of the weld line.



   6. Device according to claim 5, characterized in that the welding head (7) represents the movable element.



   7. Device according to one of claims 5 and 6, characterized in that the surface of the welding head (7) in contact with the cover sheet (4) is planar.



   The subject of the invention is a process allowing the hermetic sealing of containers made of thermoplastic material, intended to contain materials sensitive in particular to the intrusion of bacteria, liquids or gases, such as oxygen for example.



   It is almost inevitable, especially when food packaging operations are carried out mechanically, that particles of food or other material are deposited on the zone provided for welding. During subsequent control operations, such imperfections can then be detected and thus cause the rejection of many containers, consequently a high proportion of losses during packaging.



   The object of the invention is precisely to remedy these drawbacks.



   To this end, the method according to the invention is designed as defined by claim 1.



   The process of the present invention has the particularity of allowing a weld line to be obtained which is completely free of any trace of contaminating product which, by its presence, would have created the interruption of said weld line and, consequently, favored penetration of unwanted products, microorganisms, liquids or gases.



   The method is particularly well suited to sealing, using a cover sheet, containers of thermoplastic material intended to receive sensitive products, in particular food, and the edge of which intended to be welded to the sheet of cover would have been previously contaminated with traces or food particles during the filling phase.



   An implementation of the method according to the invention will be described, by way of example, with reference to the appended drawing, in which:
 fig. 1 is a sectional view illustrating the welding device before the actual welding operation,
 fig. 2 is a sectional view illustrating the operation of the device according to the invention,
 fig. 3 is a sectional view illustrating the device according to the invention once the welding operation has ended.



   The portion of thermoplastic material 8 can be melted by any means ensuring the almost simultaneous melting of the portion of material located in the axis 5 of the weld line, with the exception of the material in direct contact with the comparatively cold surfaces of welding instruments.



   This fusion can advantageously be carried out using ultrasound or high frequency electromagnetic pulses for example (microwave).



   The device used for carrying out the welding process comprises an anvil 1 provided with a boss 6. In contact with this boss, the edge of the container 2 is placed, on which the covering sheet 4 is superimposed. contact with the welding head 7, the surface of which is essentially flat and devoid of major roughness. Elements 7 and I are movable Fun with respect to each other. The welding head 7 is preferably the mobile element of the device; it moves along the axis 5 of the weld line, as indicated by the arrow in fig. 2, most generally vertically.



     Lw melting of the portion of material once produced using known means such as those described above, the pressure exerted by the welding head 7 on the assembly 2 and 4 causes the boss 6 of the anvil I in the edge of the container 2. The portion of molten material 8 is initially progressively forced towards the upper face 3, that is to say upwards. Once at this so-called upper face 3, under the effect of the pressure exerted by the head 7, the mass of molten material flows at the interface, on either side of the axis 5, the more generally horizontally. This situation is illustrated in fig. 2.



   During this displacement of molten material, the surface of the cover sheet 4 is practically not altered, the latter remaining relatively cold compared to the temperature of the portion of material 8. Any trace of foreign particle or food material is therefore driven during this displacement of molten material.



   The depth of penetration of the boss 6 in the edge of the container 2 determines the amount of material thus displaced during the welding process. It can be easily controlled. The height of said boss 6, moreover, determines the maximum penetration depth.



   Once the operations are completed and the molten material has cooled, the edge of the container 2 is found in a structural state close to that of the origin, the excess of thermoplastic material displaced during the process now constituting an uninterrupted weld line. Such a weld line can then effectively oppose any penetration of foreign contaminating elements such as microorganisms, liquids or gases.



   For the sealing of containers by the welding method according to the invention, containers will generally be used whose edge intended for welding has a thickness greater than the height of the boss 6, and also greater than the thickness of the cover sheet 4. It is important to ensure that the thickness of said sheet 4 is not significantly reduced during operations, nor that its structure is altered.



   The method of the invention has the advantage of affecting at most only a very small portion of the cover sheet 4, and this in a perfectly controllable manner.

Claims (8)

REVENDICATIONS 1. Procédé de soudage pour la fermeture étanche de récipients en matière thermoplastique à l'aide d'une feuille de couverture, caracté- risé en ce qu'on déplace une portion de matière fondue lors du cycle de soudage vers la face supérieure (3) du bord du récipient (2) et qu'on force ensuite ladite portion (8) à s'écouler latéralement, de part et d'autre de l'axe (5) de la ligne de soudure, sous la feuille de couverture (4), de façon qu'elle débarrasse la ligne de soudure de toute trace de matériau étranger pouvant interrompre la ligne de soudure.  CLAIMS    1. Welding process for sealing of thermoplastic containers using a cover sheet, characterized in that a portion of molten material is displaced during the welding cycle towards the upper face (3 ) from the edge of the container (2) and then forcing said portion (8) to flow laterally, on either side of the axis (5) of the weld line, under the cover sheet ( 4), so that it rids the weld line of all traces of foreign material which can interrupt the weld line. 2. Procédé selon la revendication 1, caractérisé en ce que la fusion de la portion de matière (8) s'effectue à l'aide de tout moyen assurant la fusion quasi simultanée de la portion de matière située dans l'axe (5) de la ligne de soudure, à l'exception de la matière en contact direct avec les surfaces comparativement froides des instruments de soudage.  2. Method according to claim 1, characterized in that the melting of the portion of material (8) is carried out using any means ensuring the almost simultaneous melting of the portion of material located in the axis (5) of the weld line, except for material in direct contact with the comparatively cold surfaces of the welding instruments. 3. Procédé selon l'une des revendications 1 ou 2, caractérisé en ce que la fusion de la portion de matière (8) s'effectue à l'aide d'ultrasons ou d'impulsions électromagnétiques à haute fréquence.  3. Method according to one of claims 1 or 2, characterized in that the fusion of the portion of material (8) is carried out using ultrasound or high frequency electromagnetic pulses. 4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce qu'on serre pendant la fusion la portion du récipient et la portion de la feuille de couverture destinées à former ensemble la fermeture étanche entre une enclume (1) portant un bossage (6) et une tête de soudage (7) de façon qu'au moins une partie et au maximum la totalité du bossage (6) soit enfoncée dans la matière.  4. Method according to one of claims 1 to 3, characterized in that during the fusion tightens the portion of the container and the portion of the cover sheet intended to form together the seal between an anvil (1) carrying a boss (6) and a welding head (7) so that at least part and at most the entire boss (6) is pressed into the material. 5. Dispositif pour la mise en oeuvre du procédé selon la revendication 1, caractérisé en ce qu'il comprend une enclume (1) présentant un bossage (6) et une tête de soudage (7), mobiles l'une par rapport à l'autre, l'élément mobile se déplaçant selon l'axe (5) de la ligne de soudure.  5. Device for implementing the method according to claim 1, characterized in that it comprises an anvil (1) having a boss (6) and a welding head (7), movable relative to the other, the movable element moving along the axis (5) of the weld line. 6. Dispositif selon la revendication 5, caractérisé en ce que la tête de soudage (7) représente l'élément mobile.  6. Device according to claim 5, characterized in that the welding head (7) represents the movable element. 7. Dispositif selon l'une des revendications 5 et 6, caractérisé en ce que la surface de la tête de soudage (7) en contact avec la feuille de couverture (4) est plane.  7. Device according to one of claims 5 and 6, characterized in that the surface of the welding head (7) in contact with the cover sheet (4) is planar. L'invention a pour objet un procédé permettant de réaliser par soudage la fermeture hermétique de récipients en matière thermoplastique, destinés à contenir des matières sensibles notamment à l'intrusion de bactéries, de liquides ou de gaz, tel l'oxygène par exemple.  The subject of the invention is a process allowing the hermetic sealing of containers made of thermoplastic material, intended to contain materials sensitive in particular to the intrusion of bacteria, liquids or gases, such as oxygen for example. Il est quasi inévitable, notamment lorsque les opérations de conditionnement des aliments s'effectuent mécaniquement, que des particules de matière alimentaire ou autre soient déposées sur la zone prévue pour la soudure. Lors des opérations de contrôle subséquentes, de telles imperfections peuvent être alors détectées et provoquent ainsi le rejet de nombreux récipients, par conséquent une proportion élevée des pertes lors du conditionnement.  It is almost inevitable, especially when food packaging operations are carried out mechanically, that particles of food or other material are deposited on the zone provided for welding. During subsequent control operations, such imperfections can then be detected and thus cause the rejection of many containers, consequently a high proportion of losses during packaging. L'invention a précisément pour but de remédier à ces inconvénients.  The object of the invention is precisely to remedy these drawbacks. A cet effet, le procédé selon l'invention est conçu tel que défini par la revendication 1.  To this end, the method according to the invention is designed as defined by claim 1. Le procédé de la présente invention présente la particularité de permettre l'obtention d'une ligne de soudure totalement exempte de toute trace de produit contaminant qui, par sa présence, aurait créé l'interruption de ladite ligne de soudure et, par conséquent, favorisé la pénétration de produits, micro-organismes, liquides ou gaz non désirés.  The process of the present invention has the particularity of allowing a weld line to be obtained which is completely free of any trace of contaminating product which, by its presence, would have created the interruption of said weld line and, consequently, favored penetration of unwanted products, microorganisms, liquids or gases. Le procédé est particulièrement bien adapté â la fermeture étanche, à l'aide d'une feuille de couverture, de récipients en matière thermoplastique destinés à recevoir des produits sensibles, notamment des aliments, et dont le bord destiné à être soudé à la feuille de couverture aurait été au préalable souillé par des traces ou particules alimentaires au cours de la phase de remplissage.  The method is particularly well suited to sealing, using a cover sheet, containers of thermoplastic material intended to receive sensitive products, in particular food, and the edge of which intended to be welded to the sheet of cover would have been previously contaminated with traces or food particles during the filling phase. Une mise en oeuvre du procédé selon l'invention sera décrite, à titre d'exemple, en se référant au dessin annexé, dans lequel: la fig. 1 est une vue en coupe illustrant le dispositif de soudage avant l'opération de soudage proprement dite, la fig. 2 est une vue en coupe illustrant le fonctionnement du dispositif selon l'invention, la fig. 3 est une vue en coupe illustrant le dispositif selon l'invention une fois l'opération de soudage terminée.  An implementation of the method according to the invention will be described, by way of example, with reference to the appended drawing, in which:  fig. 1 is a sectional view illustrating the welding device before the actual welding operation,  fig. 2 is a sectional view illustrating the operation of the device according to the invention,  fig. 3 is a sectional view illustrating the device according to the invention once the welding operation has ended. La fusion de la portion de matière thermoplastique 8 peut s'effectuer par tout moyen assurant la fusion quasi simultanée de la portion de matière située dans l'axe 5 de la ligne de soudure, à l'exception de la matière en contact direct avec les surfaces comparativement froides des instruments de soudage.  The portion of thermoplastic material 8 can be melted by any means ensuring the almost simultaneous melting of the portion of material located in the axis 5 of the weld line, with the exception of the material in direct contact with the comparatively cold surfaces of welding instruments. On peut avantageusement effectuer cette fusion à l'aide d'ultrasons ou d'impulsions électromagnétiques a haute fréquence par exemple (micro-ondes).  This fusion can advantageously be carried out using ultrasound or high frequency electromagnetic pulses for example (microwave). Le dispositif servant à la mise en oeuvre du procédé de soudage comprend une enclume 1 pourvue d'un bossage 6. Au contact de ce bossage vient se placer le bord du récipient 2 auquel se superpose la feuille de couverture 4. Cette dernière se trouve en contact avec la tête de soudage 7, dont la surface est essentiellement plane et dépourvue d'aspérités majeures. Les éléments 7 et I sont mobiles Fun par rapport à l'autre. La tête de soudage 7 est de préférence l'élément mobile du dispositif; elle se déplace selon l'axe 5 de la ligne de soudure, comme indiqué par la flèche sur la fig. 2, le plus généralement verticalement.  The device used for carrying out the welding process comprises an anvil 1 provided with a boss 6. In contact with this boss, the edge of the container 2 is placed, on which the cover sheet 4 is superimposed. contact with the welding head 7, the surface of which is essentially flat and devoid of major roughness. Elements 7 and I are movable Fun with respect to each other. The welding head 7 is preferably the mobile element of the device; it moves along the axis 5 of the weld line, as indicated by the arrow in fig. 2, most generally vertically. Lw fusion de la portion de matière une fois réalisée à l'aide de moyens connus tels ceux décrits ci-dessus, la pression exercée par la tête de soudure 7 sur l'ensemble 2 et 4 provoque l'enfoncement du bossage 6 de l'enclume I dans le bord du récipient 2. La portion de matière fondue 8 est en un premier temps progressivement forcée vers la face supérieure 3, c'est-à-dire vers le haut. Une fois parvenue à à cette dite face supérieure 3, sous l'effet de la pression exercée par la tête 7, la masse de matière fondue s'écoule à l'interface, de part et d'autre de l'axe 5, le plus généralement horizontalement. Cette situation est illustrée par la fig. 2.    Lw melting of the portion of material once produced using known means such as those described above, the pressure exerted by the welding head 7 on the assembly 2 and 4 causes the boss 6 of the anvil I in the edge of the container 2. The portion of molten material 8 is initially progressively forced towards the upper face 3, that is to say upwards. Once at this so-called upper face 3, under the effect of the pressure exerted by the head 7, the mass of molten material flows at the interface, on either side of the axis 5, the more generally horizontally. This situation is illustrated in fig. 2. Au cours de ce déplacement de matière fondue, la surface de la feuille de couverture 4 n'est pratiquement pas altérée, cette dernière demeurant relativement froide par rapport à la température de la portion de matière  During this displacement of molten material, the surface of the cover sheet 4 is practically not altered, the latter remaining relatively cold with respect to the temperature of the portion of material 8. Toute trace de particule étrangère ou de matière alimentaire est par conséquent entraînée lors de ce déplacement de matière fondue. 8. Any trace of foreign particles or food material is therefore entrained during this displacement of molten material. La profondeur de pénétration du bossage 6 dans le bord du récipient 2 détermine la quantité de matière ainsi déplacée lors du procédé de soudage. Elle peut être aisément contrôlée. La hauteur dudit bossage 6, en outre, détermine la profondeur de pénétration maximale.  The depth of penetration of the boss 6 in the edge of the container 2 determines the amount of material thus displaced during the welding process. It can be easily controlled. The height of said boss 6, moreover, determines the maximum penetration depth. Une fois les opérations terminées et la matière fondue refroidie, le bord du récipient 2 se retrouve dans un état structurel voisin de celui de l'origine, l'excédent de matière thermoplastique déplacé durant le procédé constituant désormais une ligne de soudure ininterrompue. Une telle ligne de soudure peut alors efficacement s'opposer à toute pénétration d'élément contaminant étranger tel que micro-organisme, liquide ou gaz.  Once the operations are completed and the molten material has cooled, the edge of the container 2 is found in a structural state close to that of the origin, the excess of thermoplastic material displaced during the process now constituting an uninterrupted weld line. Such a weld line can then effectively oppose any penetration of foreign contaminating elements such as microorganisms, liquids or gases. Pour la réalisation de la fermeture étanche de récipients par le procédé de soudage selon l'invention, on utilisera le plus généralement des récipients dont le bord destiné au soudage présente une épaisseur supérieure a la hauteur du bossage 6, et également supérieure à l'épaisseur de la feuille de couverture 4. Il est important de veiller à ce que l'épaisseur de ladite feuille 4 ne soit pas diminuée de façon importante au cours des opérations, ni que sa structure soit altérée.  For the sealing of containers by the welding method according to the invention, containers will generally be used whose edge intended for welding has a thickness greater than the height of the boss 6, and also greater than the thickness of the cover sheet 4. It is important to ensure that the thickness of said sheet 4 is not significantly reduced during operations, nor that its structure is altered. Le procédé de l'invention a l'avantage de n'affecter au plus qu'une très faible portion de la feuille de couverture 4, et cela de manière parfaitement contrôlable. **ATTENTION** fin du champ CLMS peut contenir debut de DESC **.  The method of the invention has the advantage of affecting at most only a very small portion of the cover sheet 4, and this in a perfectly controllable manner. ** ATTENTION ** end of the CLMS field may contain start of DESC **.
CH2287/83A 1983-04-28 1983-04-28 Welding method for the leaktight closure of thermoplastic containers, particularly containers intended to contain foodstuffs CH652965A5 (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4112610A1 (en) * 1991-04-17 1992-10-22 Branson Ultraschall Closure with tamper-proof seal for reusable plastics containers - is one-piece injection moulded plastics part fitting on container by keyed engagement
FR2829963A1 (en) * 2001-09-26 2003-03-28 Varta Microbattery Gmbh Voltaic cell container sealing apparatus has sonotrode or supporting anvil surface made with boss in sealing zone surrounded by flat surface
WO2009058825A1 (en) * 2007-10-31 2009-05-07 Novartis Ag Packaging seal plate having a shaped face
US20140215974A1 (en) * 2011-07-07 2014-08-07 Berry Plastics Corporation Package with lid sealing system
US9119450B2 (en) 2012-12-21 2015-09-01 Novartis Ag Contact lens package
US9630762B2 (en) 2014-01-22 2017-04-25 Berry Plastics Corporation Package with peelable closure
US9809360B2 (en) 2014-07-23 2017-11-07 Berry Plastics Corporation Package with peelable closure
WO2020127149A1 (en) * 2018-12-19 2020-06-25 Société des Produits Nestlé S.A. Manufacturing process for producing hermetic single-use food containers using a sealing he/ d having a specific profile with a rib
DE102020122579A1 (en) 2020-08-28 2022-03-03 Frischli Milchwerke Gmbh Device for closing containers with sections of at least one cover foil with at least one sealing tool
RU2812941C2 (en) * 2018-12-19 2024-02-05 Сосьете Де Продюи Нестле С.А. Production method for manufacturing sealed disposable containers for food products having specified profile with rib using sealing head

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4112610A1 (en) * 1991-04-17 1992-10-22 Branson Ultraschall Closure with tamper-proof seal for reusable plastics containers - is one-piece injection moulded plastics part fitting on container by keyed engagement
FR2829963A1 (en) * 2001-09-26 2003-03-28 Varta Microbattery Gmbh Voltaic cell container sealing apparatus has sonotrode or supporting anvil surface made with boss in sealing zone surrounded by flat surface
WO2009058825A1 (en) * 2007-10-31 2009-05-07 Novartis Ag Packaging seal plate having a shaped face
US20140215974A1 (en) * 2011-07-07 2014-08-07 Berry Plastics Corporation Package with lid sealing system
US9676504B2 (en) * 2011-07-07 2017-06-13 Berry Plastics Corporation Lid sealing process
US9119450B2 (en) 2012-12-21 2015-09-01 Novartis Ag Contact lens package
US9630762B2 (en) 2014-01-22 2017-04-25 Berry Plastics Corporation Package with peelable closure
US9809360B2 (en) 2014-07-23 2017-11-07 Berry Plastics Corporation Package with peelable closure
WO2020127149A1 (en) * 2018-12-19 2020-06-25 Société des Produits Nestlé S.A. Manufacturing process for producing hermetic single-use food containers using a sealing he/ d having a specific profile with a rib
JP2022511907A (en) * 2018-12-19 2022-02-01 ソシエテ・デ・プロデュイ・ネスレ・エス・アー Manufacturing process for manufacturing sealed disposable food containers using sealing heads with specific profiles with ribs
RU2812941C2 (en) * 2018-12-19 2024-02-05 Сосьете Де Продюи Нестле С.А. Production method for manufacturing sealed disposable containers for food products having specified profile with rib using sealing head
DE102020122579A1 (en) 2020-08-28 2022-03-03 Frischli Milchwerke Gmbh Device for closing containers with sections of at least one cover foil with at least one sealing tool

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