EP2531419A1 - Method for easily opening a heat-sealed seal on the locking ring of a glass container, and corresponding glass container - Google Patents

Method for easily opening a heat-sealed seal on the locking ring of a glass container, and corresponding glass container

Info

Publication number
EP2531419A1
EP2531419A1 EP11705930A EP11705930A EP2531419A1 EP 2531419 A1 EP2531419 A1 EP 2531419A1 EP 11705930 A EP11705930 A EP 11705930A EP 11705930 A EP11705930 A EP 11705930A EP 2531419 A1 EP2531419 A1 EP 2531419A1
Authority
EP
European Patent Office
Prior art keywords
heat
glass container
pot
equivalent
organic
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
EP11705930A
Other languages
German (de)
French (fr)
Other versions
EP2531419B1 (en
Inventor
Eric Martin
Boris Chauvet
Frédéric Mertz
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.)
Verallia France SA
Original Assignee
Saint Gobain Emballage SA
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 Saint Gobain Emballage SA filed Critical Saint Gobain Emballage SA
Publication of EP2531419A1 publication Critical patent/EP2531419A1/en
Application granted granted Critical
Publication of EP2531419B1 publication Critical patent/EP2531419B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
    • B65D77/10—Container closures formed after filling
    • B65D77/20—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers
    • B65D77/2024—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers the cover being welded or adhered to the container
    • B65D77/2028—Means for opening the cover other than, or in addition to, a pull tab
    • B65D77/2032—Means for opening the cover other than, or in addition to, a pull tab by peeling or tearing the cover from the container

Definitions

  • the present invention relates to glass packaging (jar, bottle with wide opening, bottle, carafe, ...) having a rim forming a surface of any geometry (annular, oval, substantially rectangular or other) and on which is heat sealed a metal seal providing a tight seal.
  • the rim is initially coated with a layer of heat-sealing primer, while the seal includes a layer of thermoplastic resin which allows heat-sealing by application of a sufficient temperature and pressure.
  • the invention relates to a method of opening a lid comprising a metal sheet and a thermoplastic resin layer through which the lid is heat-sealed on the rim of a pot or equivalent container of glass, having previously coated with a heat-sealing primer, the heat-sealed lid providing a tight closure of the pot or equivalent container of glass; this method is distinguished by the fact that the initial and final tearing forces are at most 30 N, during peeling of the lid at 90 ° at a speed of 300 mm / min.
  • the opening of the package is easy even for a relatively small person, and avoids tearing the lid in several pieces during peeling. This easy opening is now achieved while meeting the sustainable sealing requirements required for all content, including food.
  • the initial and final tearing forces are at most 28, preferably
  • the opening of the lid leaves no residue of its thermoplastic resin layer on the rim of the glass container.
  • the subject of the invention is also an equivalent pot or container (bottle, flask, carafe, etc.) of glass capable of implementing the process described above, characterized in that the heat-sealing primer coating comprises a material organic and / or mineral in which are incorporated mineral and / or organic fillers.
  • said organic material is the drying product of an aqueous dispersion of ethylene-acrylic acid copolymer whose carboxylic acid functions are partially or completely neutralized.
  • This organic material may be alone or associated with at least one other organic and / or inorganic material - in addition to fillers - in the heat-sealing primer.
  • This copolymer is solid and stable in its suspension at room temperature; the implementation by aqueous route is advantageous.
  • the pot coated with heat-sealing primer thus obtained can be delivered to its user-filler without delay, which eliminates the need to store more or less large volumes of pots before delivery.
  • the heat-sealing primer can contain mineral or organic fillers of one or more chemical natures, only mineral or organic fillers or both.
  • said mineral fillers are incorporated in the dispersions of heat-sealing primer in the form of aggregates or powder of solid particles of sizes between 1 nm and 20 ⁇ m, preferably between 150 nm and 10 ⁇ m, of one or more materials. selected from clays, kaolin, mica, talc, silicas, carbonates or alkaline earth sulfates, metal oxides.
  • organic fillers When organic fillers are employed, they are advantageously of a different chemical nature from that of the heat-sealing primer (that is to say of the material constituting it excluding the fillers) as well as the thermoplastic resin of the cap, have a melting temperature higher than that of these two constituents and consist of particles of sizes between 1 nm and 20 ⁇ m, preferably between 150 nm and 10 ⁇ m.
  • Said organic fillers preferably comprise one or more polymers assembled in the form of copolymer, graft polymer, alloy or core-shell structure chosen from high density polyethylene (HDPE), polypropylene (PP), polystyrene (PS), polyamide (PA), polyester, polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), poly (ethylene glycol) (PEG), polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), polyetheretherketone (PEEK).
  • HDPE high density polyethylene
  • PP polypropylene
  • PS polystyrene
  • PA polyamide
  • PVDF polyvinylidene fluoride
  • PTFE polytetrafluoroethylene
  • PEG poly (ethylene glycol)
  • PET polyethylene terephthalate
  • PMMA polymethyl methacrylate
  • PEEK polyetheretherketone
  • Another object of the invention lies in the application of a method, or a pot or glass equivalent container described above, to the packaging of agri-food products, such as dairy or fruit-based, meat ( dough).
  • agri-food products such as dairy or fruit-based, meat ( dough).
  • the invention makes it possible to guarantee the preservation of the contents while respecting the conditions in particular of temperature prescribed for this purpose, and the tightness of the packaging in such conditions of conservation of the contents.
  • a heat-sealing primer coating is deposited on the rim of the pot. Any other contact method, such as tempered, brush, buffer ... or without contact such as projection, spraying ... can be used.
  • Heat sealing the primary is organic and comprises an aqueous dispersion of random linear copolymer ethylene-acrylic acid of average molecular weight M w of about 33 000 g / mol expressed in polystyrene equivalent.
  • the copolymer comprises 9.1% of acrylic acid units and 90.9% of ethylene units.
  • the carboxylic acid functions of the poly (ethylene-carboxylic acid) ionomer are neutralized to 100% with ammonia.
  • the pH of the suspension is adjusted to between 8.5 and 9. According to the application method used, the solids content of heat-sealing primer used varies from 0.2 to 10% by weight; it is here 9.5% in mass.
  • This material has a broad melting peak between 70 and 95 ° C (Differential Scanning Calorimetry - DSC - 15 ° C / min).
  • the heat-sealing surface of the glass jar is roll coated with a uniform layer of primer having a mean dry thickness of 1.8 ⁇ .
  • the heat sealing is carried out according to standard settings applied in industrial conditions, by means of a soft-head heat sealer delivering a thrust of approximately 1560 N.
  • the head is heated to 250 ° C, so that the temperature at the interface pot
  • the lid reaches 149 to 155 ° C for a duration of pressure application by the heated head of 1.5 s.
  • the assembled system is waterproof.
  • the peel forces are peeled at 90 ° C at a speed of 300 mm / min.
  • the typical known peel pattern on this type of system can be described by three forces: the initial peel force (Al), the flow force (FE), and the final peel force (AF).
  • the average of Al and AF is 44.8 N.
  • the peel of the operculum is therefore relatively difficult.
  • Example 1 is reproduced except that the heat-sealing primer is mixed with a suspension of Na + partition previously dispersed with the deflocculator in deionized water at a speed of between 500 and 1000 revolutions / min. 10 minutes.
  • the solids in the mixture obtained are 9.5% by weight of primer and 0.6% by mass of Na + partition.
  • a homogeneous layer having a mean dry thickness of 1.8 ⁇ is rolled.
  • the average of Al and AF is 18.9 N, corresponding to a relatively easy operculum peel, the addition of Na + partitioning making it possible to reduce by more than 50% the force required for this purpose (to be compared with that of Comparative Example 1).
  • the operculum does not tear on peeling, after which no residue of thermoplastic resin originating from the lid is observed on the rim of the pot.
  • the opening of the packaging can therefore be described as clean.
  • Example 1 is reproduced with the difference that the heat-sealing primer is mixed with magnetic stirring to an aqueous suspension at pH 8.5. of polytetrafluoroethylene (PTFE) whose particles have an average size of 155 nm and containing a surfactant which does not interfere with the adhesion to the glass.
  • PTFE polytetrafluoroethylene
  • the solids in the mixture obtained are 9.5% by weight of primer and 4.5% by weight of PTFE.
  • the average of Al and AF is 25.3 N, corresponding to a relatively easy operculum peel, the addition of PTFE making it possible to reduce by more than 40% the force required for this purpose.
  • Example 1 is repeated with the difference that the thermosmoothing primer is mixed with magnetic stirring suspensions of Na + and PTFE partitions of Examples 2 and 3.
  • the solids in the resulting mixture are adjusted to 9.5 % by weight of primer, 0.38% by mass of Na + partition and 3% by weight of PTFE.
  • the formulation is deposited according to the same process and the same thickness as the previous examples.
  • the average of Al and AF is 14.8 N, corresponding to a very easy operculum peel, the joint addition of Na + partition and PTFE having allowed to reduce by more than 65% the force required for this purpose. .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)
  • Laminated Bodies (AREA)
  • Paints Or Removers (AREA)
  • Closing Of Containers (AREA)
  • Package Closures (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Glass Compositions (AREA)

Abstract

The invention relates to a method for opening a seal that includes a metal sheet and a thermoplastic resin layer by means of which the seal is heat-sealed onto the locking ring of a jar or similar glass container, said locking ring being pre-coated with a heat-sealing primer, the heat-sealed seal enabling the jar or similar glass container to be closed in a sealing manner, said method being characterized in that the initial and final removing forces are at most 28 N when peeling the seal at 90° C at a speed of 300 mm/min; to a jar or similar glass container capable of implementing said method, said jar or similar glass container being characterized in that the heat-sealing primer coating includes an organic and/or inorganic material having organic and/or inorganic fillers mixed therein; and to the use of said method or said jar or similar glass container for packaging agri-food materials.

Description

PROCEDE D'OUVERTURE FACILE D'UN OPERCULE THERMOSCELLE SUR LE  EASY OPENING METHOD OF A THERMOSCELLE OPERATOR ON THE
BUVANT DRINKING
RECIPIENT EN VERRE ET RECIPIENT CORRESPONDANT GLASS CONTAINER AND CORRESPONDING CONTAINER
La présente invention est relative aux emballages en verre (pot, flacon à large ouverture, bouteille, carafe,...) ayant un buvant constituant une surface de géométrie quelconque (annulaire, ovale, sensiblement rectangulaire ou autre) et sur lequel est thermoscellé un opercule métallique procurant une fermeture étanche. The present invention relates to glass packaging (jar, bottle with wide opening, bottle, carafe, ...) having a rim forming a surface of any geometry (annular, oval, substantially rectangular or other) and on which is heat sealed a metal seal providing a tight seal.
Le buvant est initialement revêtu d'une couche de primaire de thermoscellage, tandis que l'opercule comprend une couche de résine thermoplastique qui permet le thermoscellage par l'application d'une température suffisante et d'une pression.  The rim is initially coated with a layer of heat-sealing primer, while the seal includes a layer of thermoplastic resin which allows heat-sealing by application of a sufficient temperature and pressure.
Les problèmes auxquels l'utilisateur de cette technique est confronté sont de plusieurs ordres.  The problems that the user of this technique is confronted with are of several kinds.
Il est bien entendu primordial de garantir une fermeture étanche durable dans les conditions d'utilisation du produit emballé, pouvant comprendre des variations de température, voire des transformations biologiques de type fermentation... La conservation du produit dans le respect des conditions prescrites à cet effet doit être également garantie.  It is of course essential to ensure a durable seal in the conditions of use of the packaged product, which may include temperature variations, or even biological transformations of the fermentation type ... The conservation of the product in compliance with the conditions prescribed for this effect must also be guaranteed.
Le problème majeur posé par cette technique réside dans la force souvent trop importante à exercer pour ouvrir l'emballage par pelage de l'opercule. Cette force trop importante peut rendre l'opération difficile pour un jeune enfant ou une personne relativement faible. De plus, cette difficulté d'ouverture entraîne souvent la déchirure de l'opercule en plusieurs morceaux, accompagnée de résidus de résine thermoplastique de l'opercule laissés en adhésion sur la surface de thermoscellage.  The major problem posed by this technique lies in the often too great force to exert to open the package by peeling the lid. This too great strength can make the operation difficult for a young child or a relatively weak person. In addition, this difficulty of opening often causes tearing of the lid in several pieces, accompanied by residues of thermoplastic resin of the lid left in adhesion on the heat-sealing surface.
On pourrait penser à mettre en œuvre des opercules complexes multicouches polymères intégrant une couche à rupture cohésive, mais la surface de thermoscellage de l'emballage ouvert présente également des résidus adhérents de résine thermoplastique originaires de l'opercule.  One could think to implement complex multilayer polymeric lids incorporating a cohesive rupture layer, but the heat sealing surface of the open package also has adhesive residues of thermoplastic resin originating from the lid.
Les inventeurs ont donc eu comme objectif de résoudre ces problèmes. Ils y sont parvenus par l'invention qui a pour objet un procédé d'ouverture d'un opercule comprenant une feuille métallique et une couche de résine thermoplastique par l'intermédiaire de laquelle l'opercule est thermoscellé sur le buvant d'un pot ou récipient équivalent en verre, buvant préalablement revêtu d'un primaire de thermoscellage, l'opercule thermoscellé procurant une fermeture étanche du pot ou récipient équivalent en verre ; ce procédé se distingue par le fait que les forces d'arrachement initiale et finale sont d'au plus 30 N, lors d'un pelage de l'opercule à 90 ° à une vitesse de 300 mm/min. The inventors therefore had the objective of solving these problems. They have achieved this by the invention which relates to a method of opening a lid comprising a metal sheet and a thermoplastic resin layer through which the lid is heat-sealed on the rim of a pot or equivalent container of glass, having previously coated with a heat-sealing primer, the heat-sealed lid providing a tight closure of the pot or equivalent container of glass; this method is distinguished by the fact that the initial and final tearing forces are at most 30 N, during peeling of the lid at 90 ° at a speed of 300 mm / min.
Ainsi l'ouverture de l'emballage est-elle aisée même pour une personne relativement faible, et évite-t-on la déchirure de l'opercule en plusieurs morceaux lors de son pelage. Cette ouverture facile est maintenant obtenue tout en satisfaisant aux exigences d'étanchéité durable requises pour tous les contenus, notamment alimentaires.  Thus the opening of the package is easy even for a relatively small person, and avoids tearing the lid in several pieces during peeling. This easy opening is now achieved while meeting the sustainable sealing requirements required for all content, including food.
Selon des caractéristiques préférées du procédé de l'invention :  According to preferred features of the process of the invention:
- les forces d'arrachement initiale et finale sont d'au plus 28, de préférence - the initial and final tearing forces are at most 28, preferably
25 N ; N;
- l'ouverture de l'opercule ne laisse aucun résidu de sa couche de résine thermoplastique sur le buvant du récipient en verre.  the opening of the lid leaves no residue of its thermoplastic resin layer on the rim of the glass container.
L'invention a également pour objet un pot ou récipient équivalent (bouteille, flacon, carafe...) en verre apte à la mise en œuvre du procédé décrit ci-dessus, caractérisé en ce que le revêtement de primaire de thermoscellage comprend un matériau organique et/ou minéral auquel sont incorporées des charges minérales et/ou organiques.  The subject of the invention is also an equivalent pot or container (bottle, flask, carafe, etc.) of glass capable of implementing the process described above, characterized in that the heat-sealing primer coating comprises a material organic and / or mineral in which are incorporated mineral and / or organic fillers.
Dans une réalisation particulièrement intéressante, ledit matériau organique est le produit de séchage d'une dispersion aqueuse de copolymère éthylène-acide acrylique dont les fonctions acide carboxylique sont partiellement ou totalement neutralisées. Ce matériau organique peut être seul ou associé à au moins un autre matériau organique et/ou minéral - en plus des charges - dans le primaire de thermoscellage. Ce copolymère est solide et stable dans sa suspension à température ambiante ; la mise en œuvre par voie aqueuse est avantageuse.  In a particularly interesting embodiment, said organic material is the drying product of an aqueous dispersion of ethylene-acrylic acid copolymer whose carboxylic acid functions are partially or completely neutralized. This organic material may be alone or associated with at least one other organic and / or inorganic material - in addition to fillers - in the heat-sealing primer. This copolymer is solid and stable in its suspension at room temperature; the implementation by aqueous route is advantageous.
De plus le pot revêtu de primaire de thermoscellage ainsi obtenu peut être livré à son utilisateur-remplisseur sans délai, ce qui supprime la nécessité de stocker des volumes plus ou moins importants de pots avant leur livraison. Le primaire de thermoscellage peut contenir des charges minérales ou organiques d'une seule ou de plusieurs natures chimiques, uniquement des charges minérales ou organiques ou les deux associées. In addition, the pot coated with heat-sealing primer thus obtained can be delivered to its user-filler without delay, which eliminates the need to store more or less large volumes of pots before delivery. The heat-sealing primer can contain mineral or organic fillers of one or more chemical natures, only mineral or organic fillers or both.
De préférence, lesdites charges minérales sont incorporées aux dispersions de primaire de thermoscellage sous forme d'agrégats ou de poudre de particules solides de tailles comprises entre 1 nm et 20 μιτι, de préférence entre 150 nm et 10 μιτι, d'un ou plusieurs matériaux choisis parmi les argiles, kaolin, mica, talc, silices, carbonates ou sulfates d'alcalino-terreux, oxydes métalliques.  Preferably, said mineral fillers are incorporated in the dispersions of heat-sealing primer in the form of aggregates or powder of solid particles of sizes between 1 nm and 20 μm, preferably between 150 nm and 10 μm, of one or more materials. selected from clays, kaolin, mica, talc, silicas, carbonates or alkaline earth sulfates, metal oxides.
Lorsque des charges organiques sont employées, elles sont avantageusement de nature chimique différente de celle du primaire de thermoscellage (c'est-à-dire du matériau le constituant à l'exclusion des charges) ainsi que de la résine thermoplastique de l'opercule, présentent une température de fusion supérieure à celle de ces deux constituants et consistent en particules de tailles comprises entre 1 nm et 20 μιτι, de préférence entre 150 nm et 10 μιτι. Lesdites charges organiques comprennent de préférence un ou plusieurs polymères assemblés sous forme de copolymère, de polymère greffé, d'alliage ou de structure core-shell choisis parmi les polyéthylène haute densité (PEHD), polypropylène (PP), polystyrène (PS), polyamide (PA), polyester, polyfluorure de vinylidène (PVDF), polytétrafluoroéthylène (PTFE), poly(éthylène glycol) (PEG), poly(téréphtalate d'éthylène) (PET), polyméthacrylate de méthyle (PMMA), polyétheréthercétone (PEEK).  When organic fillers are employed, they are advantageously of a different chemical nature from that of the heat-sealing primer (that is to say of the material constituting it excluding the fillers) as well as the thermoplastic resin of the cap, have a melting temperature higher than that of these two constituents and consist of particles of sizes between 1 nm and 20 μm, preferably between 150 nm and 10 μm. Said organic fillers preferably comprise one or more polymers assembled in the form of copolymer, graft polymer, alloy or core-shell structure chosen from high density polyethylene (HDPE), polypropylene (PP), polystyrene (PS), polyamide (PA), polyester, polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), poly (ethylene glycol) (PEG), polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), polyetheretherketone (PEEK).
L'épaisseur de revêtement de primaire de thermoscellage sec sur le buvant du récipient en verre est avantageusement  The thickness of the primer coating of dry heat sealing on the rim of the glass container is advantageously
- au moins égale à 0,2, de préférence 0,9 et de manière particulièrement préférée 1 ,5 μιτι ;  at least equal to 0.2, preferably 0.9, and particularly preferably 1.5 μιτι;
- au plus égale à 4, de préférence 3 et de manière particulièrement préférée 2 μιτι.  at most equal to 4, preferably 3 and particularly preferably 2 μιτι.
Un autre objet de l'invention réside dans l'application d'un procédé, ou d'un pot ou récipient équivalent en verre décrits précédemment, à l'emballage de produits agroalimentaires, tels que laitiers ou à base de fruits, de viande (pâté...). En effet l'invention permet de garantir la conservation du contenu en respectant les conditions notamment de température prescrites à cet effet, et l'étanchéité de l'emballage dans de telles conditions de conservation du contenu. L'invention est maintenant illustrée par les exemples suivants. Another object of the invention lies in the application of a method, or a pot or glass equivalent container described above, to the packaging of agri-food products, such as dairy or fruit-based, meat ( dough...). Indeed, the invention makes it possible to guarantee the preservation of the contents while respecting the conditions in particular of temperature prescribed for this purpose, and the tightness of the packaging in such conditions of conservation of the contents. The invention is now illustrated by the following examples.
EXEMPLE 1 COMPARATIF  EXAMPLE 1 COMPARATIVE
On utilise  We use
- un pot en verre standard de type pot de yaourt ayant un diamètre extérieur de bague de 54,4 mm et une largeur de buvant de 4,2 mm, et a standard glass jar of yoghurt pot type having a ring outer diameter of 54.4 mm and a purging width of 4.2 mm, and
- un opercule composé d'une feuille d'aluminium de 47 μιτι d'épaisseur et d'une couche de résine thermoplastique déposée à 30 g/m2, commercialisé par la société Alcan Packaging sous la référence Aluthène® 50 II E 1 14/2. a lid made of an aluminum foil 47 μιτι thick and a layer of thermoplastic resin deposited at 30 g / m 2 , marketed by Alcan Packaging under the reference Aluthène® 50 II E 1 14 / 2.
On dépose au rouleau un revêtement de primaire de thermoscellage sur le buvant du pot. Tout autre procédé par contact, tel que trempé, pinceau, tampon ... ou sans contact tel que projection, pulvérisation ... peuvent être employés.  A heat-sealing primer coating is deposited on the rim of the pot. Any other contact method, such as tempered, brush, buffer ... or without contact such as projection, spraying ... can be used.
Le primaire de thermoscellage est organique et consiste en une dispersion aqueuse de copolymère linéaire aléatoire éthylène-acide acrylique de poids moléculaire moyen en poids Mw d'environ 33 000 g/mol exprimé en équivalent polystyrène. Le copolymère comprend 9,1 % de motifs acide acrylique, 90,9 % de motifs éthylène. Les fonctions acide carboxylique de l'ionomère poly(éthylène- acide carboxylique) sont neutralisées à 100 % à l'ammoniaque. Le pH de la suspension est ajusté entre 8,5 et 9. Suivant le procédé d'application utilisé, l'extrait sec de primaire de thermoscellage mis en œuvre varie de 0,2 à 10 % en masse ; il est ici de 9,5 % en masse. Heat sealing the primary is organic and comprises an aqueous dispersion of random linear copolymer ethylene-acrylic acid of average molecular weight M w of about 33 000 g / mol expressed in polystyrene equivalent. The copolymer comprises 9.1% of acrylic acid units and 90.9% of ethylene units. The carboxylic acid functions of the poly (ethylene-carboxylic acid) ionomer are neutralized to 100% with ammonia. The pH of the suspension is adjusted to between 8.5 and 9. According to the application method used, the solids content of heat-sealing primer used varies from 0.2 to 10% by weight; it is here 9.5% in mass.
Ce matériau présente un large pic de fusion entre 70 et 95 °C ( Differential Scanning Calorimetry - DSC - 15 °C/min ). Le profil infrarouge d'un extrait sec de ce matériau présente un rapport de pics C-H (3 020 - 2 736 cm"1 ) sur C=O ( 1 772 - 1 633 cm"1 ) de 3,2. This material has a broad melting peak between 70 and 95 ° C (Differential Scanning Calorimetry - DSC - 15 ° C / min). The infrared profile of a solids content of this material shows a CH (3020 - 2736 cm -1 ) peak ratio on C = O (1772-1 633 cm -1 ) of 3.2.
La surface de thermoscellage du pot en verre est recouverte au rouleau d'une couche uniforme de primaire d'une épaisseur sèche moyenne de 1 ,8 μιτι.  The heat-sealing surface of the glass jar is roll coated with a uniform layer of primer having a mean dry thickness of 1.8 μιτι.
Le thermoscellage est réalisé selon des réglages standards appliqués en conditions industrielles, au moyen d'une thermoscelleuse à tête souple délivrant une poussée d'environ 1560 N. La tête est chauffée à 250 °C, de sorte que la température à l'interface pot/opercule atteigne 149 à 155 °C pour une durée d'application de pression par la tête chauffée de 1 ,5 s.  The heat sealing is carried out according to standard settings applied in industrial conditions, by means of a soft-head heat sealer delivering a thrust of approximately 1560 N. The head is heated to 250 ° C, so that the temperature at the interface pot The lid reaches 149 to 155 ° C for a duration of pressure application by the heated head of 1.5 s.
Le système ainsi assemblé est étanche. Les forces de pelage sont mesurées par pelage à 90 °C à une vitesse de 300 mm/min. Le profil typique connu de pelage sur ce type de système peut se décrire selon trois forces : la force d'arrachement initiale (Al), la force d'écoulement (FE) et la force d'arrachement finale (AF). The assembled system is waterproof. The peel forces are peeled at 90 ° C at a speed of 300 mm / min. The typical known peel pattern on this type of system can be described by three forces: the initial peel force (Al), the flow force (FE), and the final peel force (AF).
Les valeurs indiquées ci-après sont, ainsi que dans les exemples suivants, des valeurs moyennes sur six pots :  The values given below are, as in the following examples, mean values over six pots:
Al = 39 N  Al = 39 N
FE = 26,2 N  FE = 26.2 N
AF = 50,6 N.  AF = 50.6 N.
La moyenne de Al et AF est de 44,8 N. Le pelage de l'opercule est donc relativement difficile.  The average of Al and AF is 44.8 N. The peel of the operculum is therefore relatively difficult.
EXEMPLE 2  EXAMPLE 2
On reproduit l'exemple 1 , à la différence près que l'on mélange le primaire de thermoscellage à une suspension de cloisite Na+ préalablement dispersée à la défloculeuse dans de l'eau désionisée à une vitesse comprise entre 500 et 1000 tours/min pendant 10 minutes. Les extraits secs dans le mélange obtenu sont de 9,5 % en masse de primaire et de 0,6 % en masse de cloisite Na+. Example 1 is reproduced except that the heat-sealing primer is mixed with a suspension of Na + partition previously dispersed with the deflocculator in deionized water at a speed of between 500 and 1000 revolutions / min. 10 minutes. The solids in the mixture obtained are 9.5% by weight of primer and 0.6% by mass of Na + partition.
On dépose au rouleau une couche homogène d'épaisseur sèche moyenne 1 ,8 μιτι.  A homogeneous layer having a mean dry thickness of 1.8 μιτι is rolled.
On mesure  We measure
Al = 20,6 N  Al = 20.6 N
FE = 10,5 N  FE = 10.5 N
AF = 17,2 N.  AF = 17.2 N.
La moyenne de Al et AF est de 18,9 N, correspondant à un pelage de l'opercule relativement facile, l'addition de cloisite Na+ ayant permis de diminuer de plus de 50 % la force requise à cet effet (à comparer à celle de l'exemple 1 comparatif). The average of Al and AF is 18.9 N, corresponding to a relatively easy operculum peel, the addition of Na + partitioning making it possible to reduce by more than 50% the force required for this purpose (to be compared with that of Comparative Example 1).
L'opercule ne se déchire pas au pelage, après lequel on n'observe sur le buvant du pot aucun résidu de résine thermoplastique originaire de l'opercule. L'ouverture de l'emballage peut donc être qualifiée de propre.  The operculum does not tear on peeling, after which no residue of thermoplastic resin originating from the lid is observed on the rim of the pot. The opening of the packaging can therefore be described as clean.
EXEMPLE 3  EXAMPLE 3
On reproduit l'exemple 1 à la différence près que l'on mélange le primaire de thermoscellage sous agitation magnétique à une suspension aqueuse à pH 8,5 de polytétrafluoroéthylène (PTFE) dont les particules ont une taille moyenne de 155 nm et contenant un tensioactif qui n'interfère pas avec l'adhésion sur le verre. Les extraits secs dans le mélange obtenu sont de 9,5 % en masse de primaire et de 4,5 % en masse de PTFE. Example 1 is reproduced with the difference that the heat-sealing primer is mixed with magnetic stirring to an aqueous suspension at pH 8.5. of polytetrafluoroethylene (PTFE) whose particles have an average size of 155 nm and containing a surfactant which does not interfere with the adhesion to the glass. The solids in the mixture obtained are 9.5% by weight of primer and 4.5% by weight of PTFE.
On dépose au rouleau un revêtement homogène d'épaisseur moyenne sèche identique à celle des exemples précédents.  Rolling is deposited a homogeneous coating of average dry thickness identical to that of the previous examples.
On mesure  We measure
Al = 26 N  Al = 26 N
FE = 9,1 N  FE = 9.1 N
AF = 24,6 N.  AF = 24.6 N.
La moyenne de Al et AF est de 25,3 N, correspondant à un pelage de l'opercule relativement facile, l'addition de PTFE ayant permis de diminuer de plus de 40 % la force requise à cet effet.  The average of Al and AF is 25.3 N, corresponding to a relatively easy operculum peel, the addition of PTFE making it possible to reduce by more than 40% the force required for this purpose.
Les mêmes remarques qu'à l'exemple 2 s'appliquent.  The same remarks as in example 2 apply.
EXEMPLE 4  EXAMPLE 4
On reproduit l'exemple 1 à la différence près que l'on mélange le primaire de thermoscellage sous agitation magnétique aux suspensions de cloisite Na+ et de PTFE des exemples 2 et 3. Les extraits secs dans le mélange obtenu sont ajustés à 9,5 % en masse de primaire, 0,38 % en masse de cloisite Na+ et 3 % en masse de PTFE. Example 1 is repeated with the difference that the thermosmoothing primer is mixed with magnetic stirring suspensions of Na + and PTFE partitions of Examples 2 and 3. The solids in the resulting mixture are adjusted to 9.5 % by weight of primer, 0.38% by mass of Na + partition and 3% by weight of PTFE.
La formulation est déposée selon le même procédé et la même épaisseur qu'aux exemples précédents.  The formulation is deposited according to the same process and the same thickness as the previous examples.
On mesure  We measure
Al = 13,5 N  Al = 13.5 N
FE = 4,7 N  FE = 4.7 N
AF = 16 N.  AF = 16 N.
La moyenne de Al et AF est de 14,8 N, correspondant à un pelage de l'opercule très facile, l'addition conjointe de cloisite Na+ et de PTFE ayant permis de diminuer de plus de 65 % la force requise à cet effet. The average of Al and AF is 14.8 N, corresponding to a very easy operculum peel, the joint addition of Na + partition and PTFE having allowed to reduce by more than 65% the force required for this purpose. .
Les mêmes remarques qu'à l'exemple 2 s'appliquent.  The same remarks as in example 2 apply.

Claims

REVENDICATIONS
Procédé d'ouverture d'un opercule comprenant une feuille métallique et une couche de résine thermoplastique par l'intermédiaire de laquelle l'opercule est thermoscellé sur le buvant d'un pot ou récipient équivalent en verre, buvant préalablement revêtu d'un primaire de thermoscellage, l'opercule thermoscellé procurant une fermeture étanche du pot ou récipient équivalent en verre, caractérisé en ce que les forces d'arrachement initiale et finale sont d'au plus 30 N, lors d'un pelage de l'opercule à 90 ° à une vitesse de 300 mm/min. Method for opening a lid comprising a metal sheet and a thermoplastic resin layer through which the lid is heat-sealed on the rim of a glass pot or equivalent container, previously having a primer coated with heat-sealing, the heat-sealed lid providing a sealed closure of the pot or equivalent container made of glass, characterized in that the initial and final tearing forces are at most 30 N when the lid is peeled at 90 ° at a speed of 300 mm / min.
Procédé selon la revendication 1 , caractérisé en ce que les forces d'arrachement initiale et finale sont d'au plus 28, de préférence 25 N.  Process according to claim 1, characterized in that the initial and final tearing forces are at most 28, preferably 25 N.
Procédé selon l'une des revendications précédentes, caractérisé en ce que l'ouverture de l'opercule ne laisse aucun résidu de ladite couche de résine thermoplastique sur ledit buvant. Method according to one of the preceding claims, characterized in that the opening of the lid leaves no residue of said thermoplastic resin layer on said rim.
Pot ou récipient équivalent en verre apte à la mise en œuvre d'un procédé selon l'une des revendications précédentes, caractérisé en ce que le revêtement de primaire de thermoscellage comprend un matériau organique et/ou minéral auquel sont incorporées des charges minérales et/ou organiques.  Pot or equivalent glass container suitable for carrying out a method according to one of the preceding claims, characterized in that the heat-sealing primer coating comprises an organic and / or mineral material in which mineral fillers are incorporated and / or organic.
Pot ou récipient équivalent en verre selon la revendication 4, caractérisé en ce que ledit matériau organique est le produit de séchage d'une dispersion aqueuse de copolymère éthylène-acide acrylique dont les fonctions acide carboxylique sont partiellement ou totalement neutralisées.  Glass pot or equivalent container according to claim 4, characterized in that said organic material is the drying product of an aqueous dispersion of ethylene-acrylic acid copolymer whose carboxylic acid functions are partially or completely neutralized.
Pot ou récipient équivalent en verre selon l'une des revendications 4 ou 5, caractérisé en ce que lesdites charges minérales sont incorporées aux dispersions de primaire de thermoscellage sous forme d'agrégats ou de poudre de particules solides de tailles comprises entre 1 nm et 20 μιτι, de préférence entre 150 nm et 10 μιτι, d'un ou plusieurs matériaux choisis parmi les argiles, kaolin, mica, talc, silices, carbonates ou sulfates d'alcalino- terreux, oxydes métalliques. Glass pot or equivalent container according to one of claims 4 or 5, characterized in that said mineral fillers are incorporated in the heat-sealing primer dispersions in the form of aggregates or powder of solid particles of sizes between 1 nm and 20 μm. μιτι, preferably between 150 nm and 10 μιτι, of one or more materials chosen from clays, kaolin, mica, talc, silicas, carbonates or alkaline earth sulfates, metal oxides.
Pot ou récipient équivalent en verre selon l'une des revendications 4 à 6, caractérisé en ce que lesdites charges organiques sont de nature chimique différente de celle du primaire de thermoscellage ainsi que de la résine thermoplastique de l'opercule, présentent une température de fusion supérieure à celle de ces deux constituants et consistent en particules de tailles comprises entre 1 nm et 20 μιτι, de préférence entre 150 nm et 10 μιτι.Pot or equivalent glass container according to one of claims 4 to 6, characterized in that said organic charges are of a chemical nature different from that of the heat-sealing primer as well as the thermoplastic resin of the operculum, have a melting point higher than that of these two constituents and consist of particles of sizes between 1 nm and 20 μm, preferably between 150 nm and 10 μιτι.
8. Pot ou récipient équivalent en verre selon la revendication 7, caractérisé en ce que lesdites charges organiques comprennent un ou plusieurs polymères assemblés sous forme de copolymère, de polymère greffé, d'alliage ou de structure core-shell choisis parmi les polyéthylène haute densité (PEHD), polypropylène (PP), polystyrène (PS), polyamide (PA), polyester, polyfluorure de vinylidène (PVDF), polytétrafluoroéthylène (PTFE), poly(éthylène glycol) (PEG), poly(téréphtalate d'éthylène) (PET), polyméthacrylate de méthyle (PMMA), polyétheréthercétone (PEEK). 8. Jar or equivalent glass container according to claim 7, characterized in that said organic fillers comprise one or more polymers assembled in the form of copolymer, graft polymer, alloy or core-shell structure chosen from high density polyethylene (HDPE), polypropylene (PP), polystyrene (PS), polyamide (PA), polyester, polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), poly (ethylene glycol) (PEG), poly (ethylene terephthalate) ( PET), polymethylmethacrylate (PMMA), polyetheretherketone (PEEK).
9. Pot ou récipient équivalent en verre selon l'une des revendications 4 à 8, caractérisé en ce que l'épaisseur de revêtement de primaire de thermoscellage sec sur le buvant est au moins égale à 0,2, de préférence 0,9 et de manière particulièrement préférée 1 ,5 μιτι.  9. Pot or equivalent glass container according to one of claims 4 to 8, characterized in that the thickness of dry heat-sealing primer coating on the rim is at least 0.2, preferably 0.9 and particularly preferably 1, 5 μιτι.
10. Pot ou récipient équivalent en verre selon l'une des revendications 4 à 9, caractérisé en ce que l'épaisseur de revêtement de primaire de thermoscellage sec sur le buvant est au plus égale à 4, de préférence 3 et de manière particulièrement préférée 2 μιτι.  10. Jar or equivalent glass container according to one of claims 4 to 9, characterized in that the thickness of dry heat-sealing primer coating on the rim is at most equal to 4, preferably 3 and particularly preferably 2 μιτι.
1 1 . Application d'un procédé selon l'une des revendications 1 à 3 ou d'un pot ou récipient équivalent en verre selon l'une des revendications 4 à 10, à l'emballage de produits agroalimentaires.  1 1. Application of a method according to one of claims 1 to 3 or a pot or equivalent glass container according to one of claims 4 to 10, to the packaging of agri-food products.
EP11705930.3A 2010-02-03 2011-01-26 Process for easy opening of a foil sealed on the opening edge of a glass container and corresponding glass container Active EP2531419B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1050738A FR2955844B1 (en) 2010-02-03 2010-02-03 METHOD FOR EASY OPENING OF A THERMOSCELLE OPERATOR ON THE FILL OF A GLASS CONTAINER
PCT/FR2011/050148 WO2011095726A1 (en) 2010-02-03 2011-01-26 Method for easily opening a heat-sealed seal on the locking ring of a glass container, and corresponding glass container

Publications (2)

Publication Number Publication Date
EP2531419A1 true EP2531419A1 (en) 2012-12-12
EP2531419B1 EP2531419B1 (en) 2013-11-20

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US (1) US9302837B2 (en)
EP (1) EP2531419B1 (en)
AR (1) AR080053A1 (en)
BR (1) BR112012019415B1 (en)
CL (1) CL2012002176A1 (en)
ES (1) ES2441812T3 (en)
FR (1) FR2955844B1 (en)
PT (1) PT2531419E (en)
RU (1) RU2566311C2 (en)
UA (1) UA106648C2 (en)
WO (1) WO2011095726A1 (en)

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FR3101861B1 (en) 2019-10-14 2021-11-12 Groupe Daucy Method of making a tin can

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RU2566311C2 (en) 2015-10-20
FR2955844A1 (en) 2011-08-05
RU2012137208A (en) 2014-03-10
AR080053A1 (en) 2012-03-07
US9302837B2 (en) 2016-04-05
FR2955844B1 (en) 2012-04-27
ES2441812T3 (en) 2014-02-06
EP2531419B1 (en) 2013-11-20
CL2012002176A1 (en) 2013-07-12
WO2011095726A1 (en) 2011-08-11
BR112012019415A2 (en) 2016-05-03
PT2531419E (en) 2014-01-29
UA106648C2 (en) 2014-09-25
US20130036715A1 (en) 2013-02-14
BR112012019415B1 (en) 2020-04-22

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