FR2712228A1 - Butt joining of heat sealable films - Google Patents

Butt joining of heat sealable films Download PDF

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Publication number
FR2712228A1
FR2712228A1 FR9313672A FR9313672A FR2712228A1 FR 2712228 A1 FR2712228 A1 FR 2712228A1 FR 9313672 A FR9313672 A FR 9313672A FR 9313672 A FR9313672 A FR 9313672A FR 2712228 A1 FR2712228 A1 FR 2712228A1
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FR
France
Prior art keywords
film
films
welding
rolling
sonotrode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
FR9313672A
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French (fr)
Inventor
Million Frederic
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SFC
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SFC
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Publication date
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Priority to FR9313672A priority Critical patent/FR2712228A1/en
Publication of FR2712228A1 publication Critical patent/FR2712228A1/en
Pending legal-status Critical Current

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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
    • 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
    • B29C66/344—Stretching or tensioning the joint area during joining
    • 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
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • B29C65/083—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil
    • B29C65/086—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil using a rotary anvil
    • 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
    • B29C66/03—After-treatments in the joint area
    • B29C66/032—Mechanical after-treatments
    • B29C66/0324—Reforming or reshaping the joint, e.g. folding over
    • B29C66/03241—Flattening
    • B29C66/03242—Flattening of sheets being positioned in abutment, e.g. after folding open of an overlap joint
    • 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
    • B29C66/1122—Single lap to lap joints, i.e. overlap 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
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • B29C66/739—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 material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—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 material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—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 material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • 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
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/824—Actuating mechanisms
    • B29C66/8242—Pneumatic or hydraulic drives
    • 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
    • B29C66/836—Moving relative to and tangentially to the parts to be joined, e.g. transversely to the displacement of the parts to be joined, e.g. using a X-Y table
    • 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
    • B29C66/836—Moving relative to and tangentially to the parts to be joined, e.g. transversely to the displacement of the parts to be joined, e.g. using a X-Y table
    • B29C66/8362—Rollers, cylinders or drums moving relative to and tangentially to the parts to be joined
    • 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
    • B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/743—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc
    • B29C65/7443—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc by means of 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
    • 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
    • B29C66/71—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 composition of the plastics material of the parts to be joined
    • 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
    • B29C66/8145—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 constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/81463—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 constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a plurality of single pressing elements, e.g. a plurality of sonotrodes, or comprising a plurality of single counter-pressing elements, e.g. a plurality of anvils, said plurality of said single elements being suitable for making a single joint
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/08—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns
    • B29K2105/0854—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns in the form of a non-woven mat

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

Partially or totally heat sealable films or parts of films are joined end to end by: superimposing the films (F1,F2) over a length (F3); making a weld cut (S) in the superimposed length (F3); separating the joined films about the mold line(S); submitting the weld cut (S) to a flattening operation. The films are maintained under tension while cut and the weld cut tool and flattening tool are mounted to be able to traverse the width of the film. The two tools are ultrasonic with heads (2a,3a) displaceable w.r.t. annils (2b,3b).

Description

Procédé Dour assembler bout à bout des films ou Darties d'un film ' > artiellement ou totalement thermofusible et le disDositit de mise en oeuvre. A method of assembling films or films of an arti fi cally or wholly thermofusible film end-to-end and the processing disproportion.

L'invention se rattache au secteur technique des ensembles ultrasoniques. The invention relates to the technical sector of ultrasonic assemblies.

Le but recherché selon l'invention, est d'assurer l'assemblage bout à bout, de deux films distincts de même nature ou de deux parties d'un même film, notamment en polypropylène, sans pour cela exclure d'autres films. The aim of the invention is to ensure the end-to-end assembly of two different films of the same nature or two parts of the same film, in particular polypropylene, without excluding other films.

Actuellement, les solutions employées pour réaliser cette fonction et les résultats obtenus ne donnent pas satisfaction. Currently, the solutions used to achieve this function and the results obtained are not satisfactory.

Généralement, les parties du ou des films devant être raccordées, sont superposées pour être soumises à une opération de soudure, notamment par ultra-sons. II apparait donc une surépaisseur au niveau de la jonction des deux films ou des deux parties de film. Generally, the parts of the film or films to be connected, are superimposed to be subjected to a welding operation, including ultrasound. There is therefore an extra thickness at the junction of the two films or the two parts of film.

Or, une telle surépaisseur n'est pas compatible avec les utilisations du film. Dans ces conditions, lorsque par exemple un défaut apparait lors du traitement du film, nécessitant de supprimer un tel défaut par une opération de coupe, et par conséquent de raccorder dans une seconde phase, les parties restantes du film, la surépaisseur au niveau du raccordement ne permet plus d'utiliser le film. II est donc nécessaire, soit de mettre au rebut le film, soit de l'utiliser pour du second choix. However, such an allowance is not compatible with the uses of the film. Under these conditions, when for example a defect appears during the processing of the film, requiring to remove such a defect by a cutting operation, and therefore to connect in a second phase, the remaining parts of the film, the extra thickness at the connection no longer allows to use the film. It is therefore necessary either to discard the film or to use it for second choice.

L'invention s'est fixée pour but de remédier à ces inconvénients, de manière simple, sûre, efficace et rationnelle. The object of the invention is to remedy these disadvantages in a simple, safe, effective and rational manner.

Le problème que se propose de résoudre l'invention est de pouvoir assembler bout à bout des films ou parties d'un même film, sans aucune surépaisseur au niveau de la jonction. The problem to be solved by the invention is to assemble end-to-end films or parts of the same film, without any extra thickness at the junction.

Pour résoudre un tel problème, il a été conçu et mis au point un procédé comprenant les étapes suivantes:
- on superpose les films ou parties d'un film sur une certaine longueur
- on réalise une coupe soudante au niveau des parties superposées du ou des films
- on écarte le ou les films ainsi assemblés de part et d'autre de la ligne de coupe soudante
- on soumet la ligne de coupe soudante à une opération de laminage.To solve such a problem, it has been designed and developed a method comprising the following steps:
- the films or parts of a film are superimposed on a certain length
a welding cut is made at the overlapping portions of the film or films
- the film or films thus assembled are separated on either side of the welding cut line
the weld cutting line is subjected to a rolling operation.

Avantageusement, on met en tension la partie du ou des films devant être soumise à l'opération de coupe soudante. Advantageously, the portion of the film or films to be subjected to the welding cutting operation is tensioned.

Pour la mise en oeuvre du procédé, il a été conçu un dispositif qui comprend convenablement montés sur une machine:
- des moyens aptes à assurer une coupe soudante de la partie du ou des films superposés.For the implementation of the method, it has been conceived a device which comprises suitably mounted on a machine:
means capable of ensuring a welding cut of the part of the superposed film or films.

- des moyens de laminage de l'arête résultant de la coupe soudante. - Rolling means of the edge resulting from the welding cut.

- des moyens de mise en tension de la partie du ou des films devant être soumise à l'opération de coupe soudante. means for tensioning the portion of the film or films to be subjected to the welding cutting operation.

Pour résoudre le problème posé de pouvoir traiter le film sur la totalité de sa largeur, les moyens, aptes à assurer la coupe soudante et les moyens de laminage, sont assujettis à des organes pour être déplacés transversalement par rapport au film.  To solve the problem of being able to treat the film over its entire width, the means, capable of ensuring the welding cut and the rolling means, are subject to organs to be moved transversely relative to the film.

Le problème posé d'assurer une coupe soudante des parties superposées du ou des films, est résolu en ce que les moyens de coupe soudante sont du type ultrasonique et présentent un ensemble comprenant une sonotrode disposée en alignement coaxial à une enclume ou contre outil de coupe, L'ensemble étant déplaçable par rapport au film mis en tension entre la sonotrode et l'enclume. The problem posed of ensuring a welding cut of the superimposed parts of the film or films, is solved in that the welding cutting means are of the ultrasonic type and have an assembly comprising a sonotrode arranged in alignment coaxial with an anvil or counter cutting tool , The assembly being movable relative to the film tensioned between the sonotrode and the anvil.

Pour résoudre le problème posé de supprimer toute surépaisseur au niveau de la jonction des parties assemblées du ou des films, les moyens de laminage sont du type ultrasonique et présentent une sonotrode disposée en regard d'une enclume fixe, sur laquelle est positionnée l'arête résultant de la coupe soudante, la sonotrode étant déplacable par rapport à l'enclume. To solve the problem of removing any excess thickness at the junction of the assembled parts of the film or films, the rolling means are of the ultrasonic type and have a sonotrode disposed opposite a fixed anvil, on which is positioned the edge resulting from the welding cut, the sonotrode being movable relative to the anvil.

Les différents moyens de coupe soudante, de laminage et de mise en tension, sont montés en combinaison avec des rouleaux de renvoi et d'entrainement du ou des films traiter. The various means of welding cutting, rolling and tensioning, are mounted in combination with the return rollers and drive the film or treat.

L'invention est exposée, ci-après plus en détail à l'aide des dessins annexés, dans lesquels:
Les figures 1, 2, 3, 4 et 5 montrent par des vues à caractère schématique, les principalés phases du procédé selon l'invention.The invention is described below in more detail with the aid of the accompanying drawings, in which:
Figures 1, 2, 3, 4 and 5 show by schematic views, the main phases of the method according to the invention.

Les figures 6,7, 8 et 9 sont des vues à grande échelle et à caractère schématique montrant le principe d'assemblage bout à bout de deux films ou de deux parties d'un même film. Figures 6,7, 8 and 9 are large scale and schematic views showing the principle of butt jointing two films or two parts of the same film.

La figure 10 est une vue en coupe transversale considérée selon la ligne 10.10 de la figure 3.  FIG. 10 is a cross-sectional view taken along the line 10.10 of FIG. 3.

La figure 11 est une vue en coupe transversale considérée selon la ligne 11.11 de la figure 3. FIG. 11 is a cross-sectional view taken along the line 11.11 of FIG. 3.

Comme le montrent les figures 6 à 9, I'assemblage bout à bout de deux films (F1) (F2) (ou des deux parties d'un même film) s'effectue selon les principales étapes suivantes:
- les deux films (F1) (F2) sont superposés sur une certaine longueur (F3) (figure 6),
- la partie superposée (F3) des deux films est soumise à une opération de coupe soudante (S) (figure 7),
- les deux films (F1) (F2) sont écartés de part et d'autre de la ligne de coupe soudante (S) (figure 8),
- l'arête résultante (S1) de la coupe soudante (S) est soumie à une opération de laminage (figure 9), de sorte que les deux films (F1) (F2) sont assemblés bout à bout, sans aucune surépaisseur.As shown in FIGS. 6 to 9, the end-to-end assembly of two films (F1) (F2) (or of two parts of the same film) is carried out according to the following main steps:
the two films (F1) (F2) are superimposed over a certain length (F3) (FIG.
the superposed part (F3) of the two films is subjected to a welding cutting operation (S) (FIG. 7),
the two films (F1) (F2) are spaced apart on either side of the welding cutting line (S) (FIG. 8),
- The resulting edge (S1) of the sealing section (S) is subjected to a rolling operation (Figure 9), so that the two films (F1) (F2) are assembled end to end, without any extra thickness.

Pour mettre en oeuvre ce procédé d'assemblage tel que défini ci-dessus, il a été conçu et mis au point une machine qui comprend, essentiellement, convenablement montée sur un bâti support (1), des moyens (2) aptes à assurer la coupe soudante et des moyens (3) aptes à assurer le laminage de l'arête (S1) résultant de la coupe soudante. To implement this assembly method as defined above, it has been designed and developed a machine which comprises, essentially, suitably mounted on a support frame (1), means (2) adapted to provide the welding cutter and means (3) capable of rolling the edge (S1) resulting from the welding cut.

Les moyens (2) sont constitués par un ensemble ultrasonique comprenant une sonotrode (2a) disposée en alignement coaxial à une enclume ou contre-outil de coupe (2b). Cet ensemble est solidiare d'un support (4) monté avec capacité de déplacement linéaire en translation, par rapport au film, notamment à la partie superposée (F3). Par exemple, le support (4) est monté en combinaison avec des barres de guidage (5) et des organes de roulement. L'ensemble ultrasonique (2) est déplaçable linéairement d'un bord à l'autre de la partie superposée des films (F3), soit d'une manière manuelle, soit d'une manière automatique (figure 11). The means (2) consist of an ultrasonic assembly comprising a sonotrode (2a) disposed in coaxial alignment with an anvil or counter-cutting tool (2b). This assembly is solidiare a support (4) mounted with translational linear displacement capacity, relative to the film, in particular the superimposed portion (F3). For example, the support (4) is mounted in combination with guide bars (5) and rolling members. The ultrasonic assembly (2) is linearly movable from one edge to the other of the superposed part of the films (F3), either manually or automatically (FIG. 11).

Les moyens de laminage (3) sont du type ultra-sonique et présentent une sonotrode (3a) disposée en regard d'une enclume fixe (3b). La sonotrode (3a) est solidaire d'un support (6) monté avec capacité de déplacement linéaire guidé par rapport à l'enclume (3b). Par exemple, de la même façon que le support (4), le support (6) est monté à libre coulissement le long de barres de guidage (7) en combinaison avec des organes de roulement. L'enclume (3b) a une longueur au moins égale à la largeur du ou des films à traiter. The rolling means (3) are of the ultra-sonic type and have a sonotrode (3a) arranged facing a fixed anvil (3b). The sonotrode (3a) is integral with a support (6) mounted with linear displacement capacity guided relative to the anvil (3b). For example, in the same way as the support (4), the support (6) is mounted freely sliding along guide bars (7) in combination with rolling members. The anvil (3b) has a length at least equal to the width of the film or films to be treated.

De part et d'autre de l'ensemble ultrasonique de coupes soudantes (2) sont montés des moyens de mise en tension des parties superposées (F2) du film à traiter. Ces moyens peuvent être constitués par des pinces pneumatiques (8) et (9). On either side of the ultrasonic assembly of welding cuts (2) are mounted means for tensioning the superposed portions (F2) of the film to be treated. These means may be constituted by pneumatic grippers (8) and (9).

L'ensemble des différents moyens tels que définis ci-dessus, sont montés sur une machine équipée de différents rouleaux de renvoi de guidage et d'entraînement (10) (11) (12) (13). Cette machine ainsi équipée peut être montée entre une machine du type dérouleuse (D) et une machine du type enrouleuse (E). All of the various means as defined above, are mounted on a machine equipped with different guide and drive return rollers (10) (11) (12) (13). This machine thus equipped can be mounted between a machine of the type unrolling (D) and a machine of the winding type (E).

On se réfère maintenant aux figures 1 à 5 des dessins, qui montrent, par des vues à caractère schématique, le principe d'assemblage bout à bout des deux parties (F1) (F2) d'un film (F) disposé entre par exemple, un dérouleur (D) et un enrouleur (E). La machine équipée des moyens de mise en oeuvre selon l'invention est interposée entre le dérouleur et l'enrouleur. Referring now to Figures 1 to 5 of the drawings, which show, by schematic views, the principle of end-to-end assembly of the two parts (F1) (F2) of a film (F) disposed between for example , unwinder (D) and reel (E). The machine equipped with the means of implementation according to the invention is interposed between the unwinder and the reel.

A la figure 1, le film (F) est déroulé au travers de la machine en combinaison notamment avec les rouleaux (10) (11) et (13). Si l'on détecte un défaut sur le film, ce dernier est coupé à ce niveau, les deux extrémités résultantes (F1) (F2) étant disposées en superposition au niveau du poste apte à assurer la coupe soudante. Notamment les deux parties du film (F1) (F2) sont disposées entre les pinces pneumatiques (8) et (9). L'action de serrage des pinces (8) et (9) a pour effet de mettre en tension les deux parties du film superposées (F1) (F2). Dans ces conditions, il est possible de déplacer transversalement l'ensemble (2) pour assurer au fur et à mesure de son déplacement, une coupe soudante des deux parties (F1) (F2) (figure 3). In Figure 1, the film (F) is unwound through the machine in combination in particular with the rollers (10) (11) and (13). If a defect is detected on the film, it is cut at this level, the two resulting ends (F1) (F2) being arranged in superposition at the station capable of ensuring the welding cut. In particular, the two parts of the film (F1) (F2) are arranged between the pneumatic grippers (8) and (9). The clamping action of the clamps (8) and (9) has the effect of tensioning the two superposed portions of the film (F1) (F2). Under these conditions, it is possible to move the assembly transversely (2) to ensure as and when its movement, a welding section of the two parts (F1) (F2) (Figure 3).

A ce niveau, les deux extrémités du film (F1) (F2) sont assemblées pour constituer de nouveau un film continu exempt de défauts. At this point, the two ends of the film (F1) (F2) are assembled to form again a continuous film free of defects.

Le film (F) est écarté de part et d'autre de la ligne de coupe soudante (S), de manière à disposer l'arête résultante (S1) au niveau du poste de laminage (3) (figure 4), la pince pneumatique (8) ayant été préalablement dessérée. Le déplacement de la sonotrode (3a) le long de l'arête (S1), en combinaison avec l'enclume (3b) permet d'écraser cette dernière, et supprimer ainsi toute aspérité et surépaisseur au niveau de la jonction des deux parties de film (F1) (F2) (figure 5). The film (F) is spaced apart on both sides of the welding cutting line (S), so as to dispose the resulting edge (S1) at the rolling station (3) (FIG. tire (8) having been previously drawn. The displacement of the sonotrode (3a) along the edge (S1), in combination with the anvil (3b) allows to crush the latter, and thus remove any roughness and thickness at the junction of the two parts of film (F1) (F2) (Figure 5).

A noter que le transfert du film dans les conditions indiquées, d'une part, au niveau du poste (2) et, d'autre part, au niveau du poste (3) peut s'effectuer manuellement ou par tout moyen de préhension automatique. It should be noted that the transfer of the film under the conditions indicated, on the one hand, at the station (2) and, on the other hand, at the station (3) can be carried out manually or by any automatic gripping means .

Le procédé trouve une application pour. l'assemblage de tout film en polypropylène, en matériaux non tissé, totalement ou partiellement thermofusible.  The method finds an application for. the assembly of any polypropylene film, non-woven material, totally or partially thermofusible.

Les avantages ressortent bien de la description. The advantages are apparent from the description.

Claims (9)

REVEND I CAT IONSCLASS I CAT IONS -1- Procédé pour assembler bout à bout des films ou parties d'un film partiellement ou totalement thermofusible, caractérisé en ce qu'il comprend les étapes suivantes: - on superpose les films ou parties d'un film sur une certaine longueur (F3), - on réalise une coupe soudante (S) au niveau des parties superposées (F3) du ou des films, - on écarte le ou les films ainsi assemblés de part et d'autre de la ligne de coupe soudante (S), - on soumet la ligne de coupe soudante (S) à une opération de laminage.-1- A process for joining end-to-end films or parts of a partially or fully thermofusible film, characterized in that it comprises the following steps: - the films or parts of a film are superimposed over a certain length (F3 ), - a welding cut (S) is made at the superposed portions (F3) of the film or films, - the film or films thus assembled are separated on either side of the weld cutting line (S), the weld cutting line (S) is subjected to a rolling operation. -2- Procédé selon la revendication 1, caractérisé en ce que l'on met en tension la partie du ou des films devant être soumise à l'opération de coupe soudante (S).-2- Method according to claim 1, characterized in that one puts in tension the portion of the film or films to be subjected to the welding cutting operation (S). -3- Dispositif pour la mise en oeuvre du procédé selon l'une quelconque des revendications 1 et 2, caractérisé en ce qu'il comprend convenablement montés sur une machine: - des moyens (2) aptes à assurer une coupe soudante de la partie du ou des films superposés, - des moyens de laminage (3) de l'arête résultant de la coupe soudante (S), - des moyens de mise en tension (8) et (9) de la partie du ou des films devant être soumise à l'opération de coupe soudante (S).-3- Device for carrying out the method according to any one of claims 1 and 2, characterized in that it comprises suitably mounted on a machine: - means (2) capable of ensuring a weld section of the part superimposed film (s), - rolling means (3) of the edge resulting from the welding cut (S), - tensioning means (8) and (9) of the part of the film or films to be subjected to the welding cutting operation (S). -4- Dispositif selon la revendication 3, caractérisé en ce que les moyens (2), aptes à assurer la coupe soudante (S) et les moyens de laminage (3), sont assujettis à des organes pour être déplacés transversalement par rapport au film. -4- Device according to claim 3, characterized in that the means (2), adapted to ensure the welding cut (S) and the rolling means (3), are subject to bodies to be moved transversely to the film . -5- Dispositif selon la revendication 3, caractérisé en ce que les moyens de coupe soudante (2) sont du type ultrasonique et présentent un ensemble comprenant une sonotrode (2a) disposée en alignement coaxial à une enclume ou contre outil de coupe (2b), L'ensemble (2) étant déplacable par rapport au film mis en tension entre la sonotrode et l'enclume.-5- Device according to claim 3, characterized in that the welding cutting means (2) are of the ultrasonic type and have an assembly comprising a sonotrode (2a) arranged in coaxial alignment with an anvil or against cutting tool (2b) , The assembly (2) being movable relative to the film tensioned between the sonotrode and the anvil. -6- Dispositif selon la revendication 3, caractérisé en ce que les moyens de laminage (3) sont du type ultrasonique et présentent une sonotrode (3a) disposée en regard d'une enclume fixe (3b), sur laquelle est positionnée l'arête (S1) résultant de la coupe soudante, la sonotrode (3a) étant déplacable par rapport à l'enclume (3b).-6- Device according to claim 3, characterized in that the rolling means (3) are of the ultrasonic type and have a sonotrode (3a) disposed opposite a fixed anvil (3b), on which is positioned the edge (S1) resulting from the welding cut, the sonotrode (3a) being movable relative to the anvil (3b). -7- Dispositif selon la revendication 3, caractérisé en ce que les moyens de mise en tension (8) et (9) sont disposés de part et d'autre de l'ensemble ultra sonique (2) de coupe soudante (S).-7- Device according to claim 3, characterized in that the tensioning means (8) and (9) are arranged on either side of the ultra sonic assembly (2) of welding cut (S). -8- Dispositif selon la revendication 3, caractérisé en ce que les moyens de mise en tension (8) et (9) sont constitués par des pinces pneumatiques.-8- Device according to claim 3, characterized in that the tensioning means (8) and (9) are constituted by pneumatic grippers. -9- Dispositif selon la revendication 3, caractérisé en ce que les moyens de coupe soudante (2) de laminage (3) et de mise en tension (8) et (9) sont montés en combinaison avec des rouleaux de renvoi et d'entrainement (10) (11) (12) (13) du ou des films traiter. -9- Device according to claim 3, characterized in that the brazing cutting means (2) rolling (3) and tensioning (8) and (9) are mounted in combination with return rollers and training (10) (11) (12) (13) of the film or films to be processed.
FR9313672A 1993-11-09 1993-11-09 Butt joining of heat sealable films Pending FR2712228A1 (en)

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Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1348018A (en) * 1963-01-09 1964-01-04 Kampf Maschf Erwin Winding machine equipped with a device for welding the superimposed ends of strips of material
US3384527A (en) * 1965-02-12 1968-05-21 Fener Alfred Means for splicing thermoplastic webbing
US3821048A (en) * 1973-03-02 1974-06-28 Scm Corp Ultrasonic ribbon splicer
DE2412676A1 (en) * 1973-03-19 1974-10-03 Platmanufaktur Ab TOOL FOR WELDING PLASTIC FILMS THROUGHOUT THE PACKAGING
US3890892A (en) * 1970-10-30 1975-06-24 Eastman Kodak Co Ultrasonic marking
US3901749A (en) * 1974-08-27 1975-08-26 Ncr Co Method and apparatus for forming an endless ribbon
JPS565730A (en) * 1979-06-28 1981-01-21 Dainippon Printing Co Ltd Manufacturing for continuous film for packaging
FR2575447A1 (en) * 1984-12-27 1986-07-04 Clairet Joseph Method for joining the ends of two strips of heat-meltable material and device for its implementation
JPH04144735A (en) * 1990-10-05 1992-05-19 Katsuhiko Otani Joining method of film, joint film obtained from the same method and endless film
FR2689436A1 (en) * 1992-04-07 1993-10-08 Linder Ets Ultrasonic fabric cutting - comprises moving material between ultrasonic cutter and cutting surface, holding material against cutting surface while irradiating, cutting and opt. welding the edge

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1348018A (en) * 1963-01-09 1964-01-04 Kampf Maschf Erwin Winding machine equipped with a device for welding the superimposed ends of strips of material
US3384527A (en) * 1965-02-12 1968-05-21 Fener Alfred Means for splicing thermoplastic webbing
US3890892A (en) * 1970-10-30 1975-06-24 Eastman Kodak Co Ultrasonic marking
US3821048A (en) * 1973-03-02 1974-06-28 Scm Corp Ultrasonic ribbon splicer
DE2412676A1 (en) * 1973-03-19 1974-10-03 Platmanufaktur Ab TOOL FOR WELDING PLASTIC FILMS THROUGHOUT THE PACKAGING
US3901749A (en) * 1974-08-27 1975-08-26 Ncr Co Method and apparatus for forming an endless ribbon
JPS565730A (en) * 1979-06-28 1981-01-21 Dainippon Printing Co Ltd Manufacturing for continuous film for packaging
FR2575447A1 (en) * 1984-12-27 1986-07-04 Clairet Joseph Method for joining the ends of two strips of heat-meltable material and device for its implementation
JPH04144735A (en) * 1990-10-05 1992-05-19 Katsuhiko Otani Joining method of film, joint film obtained from the same method and endless film
FR2689436A1 (en) * 1992-04-07 1993-10-08 Linder Ets Ultrasonic fabric cutting - comprises moving material between ultrasonic cutter and cutting surface, holding material against cutting surface while irradiating, cutting and opt. welding the edge

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Title
PATENT ABSTRACTS OF JAPAN vol. 16, no. 426 (M - 1306) 8 September 1992 (1992-09-08) *
PATENT ABSTRACTS OF JAPAN vol. 5, no. 50 (M - 062) 9 April 1981 (1981-04-09) *

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