FR2734235A1 - Device for sealing elastic bags by welding - Google Patents

Device for sealing elastic bags by welding Download PDF

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Publication number
FR2734235A1
FR2734235A1 FR9505766A FR9505766A FR2734235A1 FR 2734235 A1 FR2734235 A1 FR 2734235A1 FR 9505766 A FR9505766 A FR 9505766A FR 9505766 A FR9505766 A FR 9505766A FR 2734235 A1 FR2734235 A1 FR 2734235A1
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FR
France
Prior art keywords
energy
slot
energy concentration
concentration slot
welding
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
FR9505766A
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French (fr)
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FR2734235B1 (en
Inventor
Jean Marie Vauzelle
Francois Vauzelle
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ZEL SOC CIV
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ZEL SOC CIV
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Publication date
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Priority to FR9505766A priority Critical patent/FR2734235B1/en
Priority to FR9604246A priority patent/FR2734236B1/en
Publication of FR2734235A1 publication Critical patent/FR2734235A1/en
Application granted granted Critical
Publication of FR2734235B1 publication Critical patent/FR2734235B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • 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
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/24—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools characterised by the means for heating the tool
    • B29C65/245—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools characterised by the means for heating the tool the heat transfer being achieved contactless, e.g. by radiation
    • 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
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/1403—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the type of electromagnetic or particle radiation
    • B29C65/1412—Infrared [IR] radiation
    • 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
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/22—Heated wire resistive ribbon, resistive band or resistive strip
    • B29C65/221—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip
    • B29C65/224—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip being a resistive ribbon, a resistive band or a resistive strip
    • 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
    • B29C66/431—Joining the articles to themselves
    • B29C66/4312—Joining the articles to themselves for making flat seams in tubular or hollow articles, e.g. transversal seams
    • B29C66/43121—Closing the ends of tubular or hollow single articles, e.g. closing the ends of bags
    • 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
    • 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
    • B29C66/8122—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 composition of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • 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
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/861—Hand-held tools
    • 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
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10—Applying or generating heat or pressure or combinations thereof
    • B65B51/22—Applying or generating heat or pressure or combinations thereof by friction or ultrasonic or high-frequency electrical means, i.e. by friction or ultrasonic or induction welding
    • 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
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/1487—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation making use of light guides
    • 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
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/1496—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation making use of masks
    • 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
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/22—Heated wire resistive ribbon, resistive band or resistive strip
    • B29C65/221—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip
    • B29C65/226—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip characterised by the cross-section of said heated wire, resistive ribbon, resistive band or resistive strip, e.g. being triangular
    • 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
    • B29C66/70—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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Package Closures (AREA)

Abstract

A device for sealing, by welding, plastic bags consists of a base(1) on which are mounted two parts (3,4) defining between them a window of energy concentration (5) into which the user can engage the end of a previously unwound plastic bag and move it to partially weld it and so seal it. One part (3) is the emitter (3) protected by a cover (9) in refractory material open in front of the concentration window (5) and enclosing an I.R. lamp (11). Two metal vanes (12,12') ending at the level of the window concentrate the lamp energy to get a maximum temp. at that point. The other part (4), the receiver is made of a temp. resistant material on which is fixed a metal bar (6) in front of the energy concentration window essentially opposite to end of the emitters metal vanes (12,12').

Description

Dispositif de fermeture par soudage de sacs plastiques
La présente invention se rapporte à un dispositif de fermeture par soudage de sacs plastiques plus spécialement destiné aux magasins d'alimentation, en particulier aux rayons alimentation des grandes surfaces.Plastic bag sealing device
The present invention relates to a device for closing by welding plastic bags more especially intended for food stores, in particular to the food departments of large areas.

A côté des rayons libre-service dans lesquels les clients se servent eux-mêmes, les grandes surfaces possèdent classiquement des rayons dans lesquels des vendeurs servent la clientèle, par exemple les rayons charcuterie, boucherie, poissonnerie, crémerie.... Dans ces rayons, les vendeurs ont l'habitude de rassembler tous les achats d'un même client dans des sacs plastiques qu'ils ferment au moyen d'agrafes en y fixant l'étiquette correspondant au prix à payer à la caisse. In addition to the self-service departments in which customers serve themselves, supermarkets conventionally have departments in which sellers serve customers, for example the deli, butcher, fishmonger and dairy departments. , sellers are used to collecting all purchases from the same customer in plastic bags which they close with staples and attach the label corresponding to the price to be paid at the checkout.

Ce système de fermeture n'est pas sans inconvénients, vu que les agrafes sont source de nombreuses blessures pouvant s'avérer graves, et va pour cette raison être interdit par les autorités dans les années à venir. This closure system is not without drawbacks, since the staples are the source of many injuries which can be serious, and will therefore be prohibited by the authorities in the years to come.

Il est donc nécessaire de concevoir des systèmes de remplacement. It is therefore necessary to design replacement systems.

A cet effet, on a déjà pensé à équiper ces rayons de dispositifs de fermeture par rubans adhésifs associés à des distributeurs d'étiquettes autocollantes ; ces dispositifs se sont cependant révélés particulièrement incommodes à l'usage.  To this end, we have already thought of equipping these departments with closure devices using adhesive tapes associated with dispensers for self-adhesive labels; these devices have however proved to be particularly inconvenient in use.

On a également déjà proposé, dans ce but, des dispositifs munis de résistances chauffantes permettant d'obtenir une fusion partielle du matériau plastique constitutif des sacs et, par suite, la fermeture de ces derniers ; de tels dispositifs ne se sont cependant pas eux non plus révélés satisfaisants vu qu'ils sont de gros consommateurs d'électricité, et surtout qu'il est très difficile de maîtriser la température des résistances, ce qui entraîne des risques de fusion du matériau plastique et d'encrassement du dispositif, générateurs de nombreuses pannes. It has also already been proposed, for this purpose, devices provided with heating resistors making it possible to obtain a partial melting of the plastic material constituting the bags and, consequently, the closing of the latter; However, such devices have also not proved satisfactory since they are large consumers of electricity, and above all that it is very difficult to control the temperature of the resistors, which involves risks of melting of the plastic material. and fouling of the device, generating numerous failures.

La présente invention a pour but de remédier à ces inconvénients en proposant un dispositif de fermeture par soudage de sacs plastiques, faible consommateur en électricité, mais parallèlement très pratique pour l'utilisateur et d'une grande fiabilité. The object of the present invention is to remedy these drawbacks by proposing a device for closing by welding plastic bags, which consumes little electricity, but which is also very practical for the user and very reliable.

Conformément à l'invention, ce dispositif est caractérisé en ce qu'il est constitué d'une embase sur laquelle sont montés deux éléments de fermeture définissant entre eux une fente de concentration de l'énergie dans laquelle un utilisateur peut engager l'extrémité d'un sac plastique préalablement enroulée en un cordon et la déplacer pour obtenir sa fusion partielle à ce niveau et par suite sa fermeture, à savoir - d'une part, un élément émetteur protégé par un capot en
un matériau réfractaire ouvert au droit de la fente de
concentration de l'énergie et renfermant à sa partie in
terne un émetteur infrarouge coopérant avec deux rails
métalliques se terminant au niveau de la fente de concen
tration de l'énergie par deux extrémités respectives si
tuées en regard à faible distance l'une de l'autre de
façon à obtenir un maximum de température à ce niveau, et - d'autre part, un élément récepteur réalisé en un matériau
résistant à la température sur lequel est fixé une barre
métallique définissant un contre-rail situé au droit de
la fente de concentration de l'énergie essentiellement
entre les extrémités respectives des rails de l'élément
émetteur.According to the invention, this device is characterized in that it consists of a base on which are mounted two closing elements defining between them an energy concentration slot in which a user can engage the end d '' a plastic bag previously rolled up in a cord and move it to obtain its partial fusion at this level and consequently its closure, namely - on the one hand, a transmitter element protected by a cover in
a refractory material open to the right of the slot
energy concentration and containing its in part
dull infrared transmitter cooperating with two rails
metal ends at the concen slot
tration of energy by two respective ends if
killed in close proximity to each other from
so as to obtain a maximum temperature at this level, and - on the other hand, a receiving element made of a material
temperature resistant to which a bar is fixed
metal defining a counter rail located to the right of
the energy focus slot basically
between the respective ends of the element rails
transmitter.

Sans qu'il s'agisse là d'une caractéristique limitative de l'invention, l'embase est généralement horizontale et la fente de concentration de l'énergie dirigée verticalement, ce sur une largeur moyenne de 3 à 10 mm. Without this being a limiting characteristic of the invention, the base is generally horizontal and the energy concentration slot directed vertically, this over an average width of 3 to 10 mm.

Compte tenu de cette configuration, pour fermer un sac, l'utilisateur doit entortiller celui-ci au niveau de son extrémité, l'introduire entre l'élément émetteur et l'élément récepteur par la partie supérieure de la fente de la concentration de l'énergie, puis le déplacer vers le bas sur une longueur moyenne de 5 à 10 cm avant de le retirer. Given this configuration, to close a bag, the user must twist it at its end, introduce it between the emitting element and the receiving element through the upper part of the slot of the concentration of l energy, then move it down an average length of 5 to 10 cm before removing it.

Un tel dispositif, qui développe une puissance moyenne de l'ordre de 250 watts au lieu d'environ 600 watts pour les dispositifs à résistances, peut être en permanence laissé sous tension et permet d'obtenir, après une durée de chauffe de l'ordre de 20 mn, une température d'environ 1400C au niveau de la fente de concentration de l'énergie. Such a device, which develops an average power of the order of 250 watts instead of about 600 watts for the resistance devices, can be left permanently on and allows to obtain, after a heating period of the around 20 min, a temperature of around 1400C at the energy concentration slot.

Cette température peut, de préférence, être réglée notamment en fonction du type de sacs plastiques à souder grâce à des organes de commande et de régulation électroniques situés à la partie interne de l'embase qui coopèrent avec l'émetteur infrarouge. This temperature can, preferably, be adjusted in particular as a function of the type of plastic bags to be welded by means of electronic control and regulation members located at the internal part of the base which cooperate with the infrared emitter.

Conformément à l'invention, celui-ci peut être simplement constitué par un émetteur du commerce à enrobage céramique. According to the invention, it can simply be constituted by a commercial emitter with ceramic coating.

Selon une autre caractéristique de l'invention, l'élément récepteur est, quant à lui, constitué par un bloc de polytétrafluoréthylène (Téflono) de préférence découpé par laser. According to another characteristic of the invention, the receiving element is, in turn, constituted by a block of polytetrafluoroethylene (Teflono) preferably cut by laser.

Pour éviter tout risque de fusion incontrôlée du matériau constitutif du sac pouvant être source d'encrassement du dispositif, il est de même souhaitable de traiter avec un revêtement en polytétrafluoréthylène toutes les parties chaudes pouvant se trouver en contact avec de matériau. To avoid any risk of uncontrolled melting of the material constituting the bag which can be a source of fouling of the device, it is likewise desirable to treat with a polytetrafluoroethylene coating all the hot parts which may be in contact with material.

Selon une autre caractéristique de l'invention, l'élément émetteur comporte une partie essentiellement parallélépipédique renfermant l'émetteur infrarouge se prolongeant en direction de la fente de concentration de l'énergie par une partie rétrécie obliquement, jusqu'à présenter au niveau de la fente une largeur de l'ordre de quelques centimètres de façon à permettre d'obtenir une concentration optimale de l'énergie à ce niveau. According to another characteristic of the invention, the emitting element comprises an essentially parallelepipedal part enclosing the infrared emitter extending in the direction of the energy concentration slot by an obliquely narrowed part, until presenting at the level of the slits a width of the order of a few centimeters so as to allow optimal concentration of energy to be obtained at this level.

Pour que ce dispositif donne toutes les garanties nécessaires du point de vue de la sécurité, il est essentiel que toutes les parties chaudes soient hors de portée des utilisateurs, et que l'embase ainsi que l'émetteur ne soient pas démontables et ne puissent être ouverts sinon par le fabricant. For this device to give all the necessary guarantees from a safety point of view, it is essential that all hot parts are out of the reach of users, and that the base and the transmitter are not removable and cannot be otherwise opened by the manufacturer.

Selon une variante préférentielle de l'invention, le dispositif de fermeture par soudage de sacs plastiques permet également de lutter efficacement contre la fraude actuellement très fréquente dans les rayons d'alimentation en libre service des grandes surfaces, en particulier, les rayons fruits et légumes Or il est bien connu des professionnels que celle-ci a pour conséquence la perte d'une proportion non négligeable des produits offerts à la vente. According to a preferred variant of the invention, the closure device by welding of plastic bags also makes it possible to effectively fight against the fraud currently very frequent in the self-service supply departments of large areas, in particular, the fruit and vegetable departments. It is well known to professionals that this results in the loss of a non-negligible proportion of the products offered for sale.

En effet, ces rayons sont classiquement équipés de balances laissées à la disposition du public qui sont associées à des organes de fermeture de sacs plastiques par ruban adhésif et à des organes d'étiquetage susceptibles de distribuer, après pesée, des tickets devant être apposés sur les sacs. Indeed, these departments are conventionally equipped with scales left available to the public which are associated with bodies for closing plastic bags by adhesive tape and with labeling bodies capable of distributing, after weighing, tickets to be affixed on the bags.

Dans ces rayons, le client place lui même les produits qu'il désire acheter dans un sac plastique transparent qu'il ferme avant de le placer sur la balance et d'y fixer l'étiquette délivrée par celle-ci.  In these departments, the customer himself places the products he wishes to buy in a transparent plastic bag which he closes before placing it on the scale and attaching the label issued by it.

Or, lorsque ces opérations sont terminées, il peut très facilement et en toute impunité réouvrir le sac, y ajouter des produits qui n'ont pas été pesés puis le refermer à nouveau avant de se présenter aux caisses. However, when these operations are completed, he can very easily and with impunity reopen the bag, add products that have not been weighed and then close it again before going to the checkout.

La présente invention permet d'éviter de tels agissements malhonnêtes en empêchant l'ouverture sans destruction des sacs préalablement fermés et en bloquant la balance et le dispositif d'étiquetage associé de façon telle qu'ils ne puissent être mis en oeuvre qu'après avoir été validés par l'opération de fermeture d'un sac, et ce de manière non répétitive. The present invention makes it possible to avoid such dishonest acts by preventing the opening, without destruction, of the bags previously closed and by blocking the scale and the associated labeling device so that they can only be used after having have been validated by the operation of closing a bag, and this in a non-repetitive manner.

A cet effet, et selon une autre caractéristique de l'invention, le dispositif comporte des moyens de détection sensibles à la présence dans la fente de concentration de l'énergie d'un sac plastique ayant été fermé par soudage et coopérant avec la balance de façon à lui transmettre en réponse un signal l'autorisant à effectuer une pesée et à distribuer une étiquette. To this end, and according to another characteristic of the invention, the device comprises detection means sensitive to the presence in the energy concentration slot of a plastic bag having been closed by welding and cooperating with the balance of so as to send him in response a signal authorizing him to perform a weighing and to distribute a label.

En conséquence, en l'absence d'un tel signal, il est impossible d'obtenir la délivrance d'un ticket permettant de se présenter aux caisses et toute tentative de fraude se trouve ainsi exclue. Consequently, in the absence of such a signal, it is impossible to obtain the issue of a ticket making it possible to present oneself at the cash desks and any attempt at fraud is thus excluded.

Selon une autre caractéristique de l'invention, les moyens de détection sont constitués par un barreau métallique soumis à l'action d'un ressort de rappel monté mobile dans l'élément récepteur et susceptible de coulisser le long du contre-rail sous l'action d'un sac déplacé dans la fente de concentration de l'énergie pour venir en prise avec un capteur de fin de course coopérant en réponse avec les organes de commande et de régulation électroniques situés à la partie interne de l'embase pour transmettre à la balance un signal l'autorisant à effectuer une pesée et à distribuer une étiquette. According to another characteristic of the invention, the detection means consist of a metal bar subjected to the action of a return spring mounted movably in the receiving element and capable of sliding along the counter rail under the action of a bag moved in the energy concentration slot to engage with a limit switch cooperating in response with the electronic control and regulation members located at the internal part of the base to transmit to balance a signal authorizing him to carry out a weighing and to distribute a label.

Lorsque le client a retiré le sac, le barreau est immédiatement rappelé vers l'extrémité de la fente de concentration de l'énergie de façon à permettre la mise en oeuvre d'un nouveau processus de fermeture d'un sac et d'une nouvelle opération de pesée. When the customer has removed the bag, the bar is immediately called back towards the end of the energy concentration slot so as to allow the implementation of a new process for closing a bag and a new weighing operation.

Les caractéristiques du dispositif qui fait l'objet de l'invention seront décrites plus en détail en se référant aux dessins annexés dans lesquels - la figure 1 est une vue en perspective du dispositif con
forme à l'invention, - la figure 2 est une coupe schématique de ce même disposi
tif.The characteristics of the device which is the subject of the invention will be described in more detail with reference to the accompanying drawings in which - Figure 1 is a perspective view of the device con
form of the invention, - Figure 2 is a schematic section of the same arrangement
tif.

Selon la figure 1, le dispositif de fermeture par soudage de sacs plastiques est constitué d'une embase 1 reposant sur des pieds 2 sur laquelle sont montés, d'une part, un élément émetteur 3 et, d'autre part, un élément récepteur 4 dont deux faces respectives 311 41 situées en regard l'une de l'autre définissent entre elles une fente de concentration de l'énergie 5 de quelques millimètres de largeur dont le rôle sera décrit plus en détail dans la suite de cet exposé. According to Figure 1, the closure device by welding of plastic bags consists of a base 1 resting on feet 2 on which are mounted, on the one hand, a transmitter element 3 and, on the other hand, a receiver element 4, of which two respective faces 311 41 situated opposite one another define between them an energy concentration slot 5 a few millimeters in width, the role of which will be described in more detail in the remainder of this description.

L'élément récepteur 4 est constitué par un bloc de polytétrafluoréthylène de forme essentiellement trapé zoïdale dont la face 41 porte une barre métallique 6 s'étendant essentiellement verticalement. The receiving element 4 is constituted by a block of polytetrafluoroethylene of essentially trapezoidal zoidal shape, the face 41 of which carries a metal bar 6 extending essentially vertically.

L'élément émetteur 3 est, quant à lui, constitué d'une partie 7 essentiellement parallélépipédique se prolongeant en direction de la face 31 et de la fente 5 par une partie 8 rétrécie obliquement. The emitting element 3 is, in turn, made up of an essentially parallelepiped part 7 extending in the direction of the face 31 and of the slot 5 by a part 8 obliquely narrowed.

Selon la.figure 2, l'élément émetteur est fermé par un double capot 9 comportant une partie interne en un matériau réfractaire et une partie externe en matériau synthétique qui présente une ouverture 10 au niveau de la face 31 et de la fente de concentration de l'énergie 5. Cet élément est en outre équipé, à sa partie interne, d'un émetteur infrarouge 11 actionné par des organes de commande et de régulation électroniques non représentés situés dans l'embase 1 et pouvant être reliés au réseau à partir d'une prise de raccordement 14. According to la.figure 2, the emitter element is closed by a double cover 9 comprising an internal part made of a refractory material and an external part made of synthetic material which has an opening 10 at the level of the face 31 and the concentration slot of energy 5. This element is further equipped, at its internal part, with an infrared emitter 11 actuated by electronic control and regulation members not shown located in the base 1 and which can be connected to the network from '' a connection socket 14.

Selon la figure 2, l'émetteur infrarouge 11 coopère avec deux rails métalliques 12, 12' dont la géométrie correspond essentiellement à celle du capot 9 et qui se terminent au niveau de l'ouverture 10 et de la fente 5 par deux extrémités respectives 13, 13' situées en regard à faible distance l'une de l'autre. A ce niveau, les rails 12, 12' coopèrent avec la barre 6 qui s'étend entre les extrémités 13, 13' essentiellement parallèlement à celles-ci et constitue ainsi un contre-rail situé du côté opposé de la fente 5 pour obtenir une concentration de l'énergie du rayonnement infrarouge permettant l'établissement d'un maximum de température. According to Figure 2, the infrared transmitter 11 cooperates with two metal rails 12, 12 'whose geometry essentially corresponds to that of the cover 9 and which terminate at the opening 10 and the slot 5 by two respective ends 13 , 13 'located opposite a short distance from each other. At this level, the rails 12, 12 'cooperate with the bar 6 which extends between the ends 13, 13' essentially parallel to these and thus constitutes a counter-rail situated on the opposite side of the slot 5 to obtain a concentration of the energy of infrared radiation allowing the establishment of a maximum temperature.

Selon la figure 1, pour fermer un sac plastique, l'utilisateur entortille l'extrémité de celui-ci de manière à former un cordon de 3 à 4 mm de diamètre et de 30 à 50 mm de longueur puis le saisit entre ses deux mains avant de l'introduire à la partie supérieure de la fente 5 et de le déplacer dans celle-ci selon la flèche A pour obtenir sa fermeture par fusion avant de le retirer en sens inverse. According to Figure 1, to close a plastic bag, the user twists the end of it so as to form a cord 3 to 4 mm in diameter and 30 to 50 mm in length and then grasps it in his two hands before introducing it into the upper part of the slot 5 and moving it therein according to arrow A to obtain its closing by fusion before removing it in the opposite direction.

L'ouverture du sac sans destruction de celui-ci est ensuite clairement rendue impossible. Opening the bag without destroying it is then clearly made impossible.

Par ailleurs et selon la figure 1, l'embase 1 est également munie d'un raccord 15 permettant de relier les organes de commande et de régulation électronique avec une balance non représentée équipée d'un dispositif d'étiquetage. Furthermore and according to Figure 1, the base 1 is also provided with a connector 15 for connecting the electronic control and regulation members with a scale not shown equipped with a labeling device.

Comme représenté schématiquement sur la figure 1, la face 41 de l'élément récepteur 4 est, par ailleurs, munie d'un barreau métallique 16 soumis à l'action d'un ressort de rappel non représenté qui est monté mobile dans une rainure 17 essentiellement parallèle à la barre 6. Ce barreau 16 est automatiquement déplacé vers le bas selon la flèche A sous l'action de l'extrémité d'un sac plastique en cours de fermeture pour venir en prise avec un capteur de fin de course 18 ; en réponse, ce capteur envoie une impulsion aux organes de commande et de régulation électroniques qui émettent un signal qu'ils transmettent à la balance pour lui donner l'autorisation d'effectuer une opération de pesage et d'étiquetage. As shown diagrammatically in FIG. 1, the face 41 of the receiving element 4 is, moreover, provided with a metal bar 16 subjected to the action of a not shown return spring which is movably mounted in a groove 17 essentially parallel to the bar 6. This bar 16 is automatically moved downward according to arrow A under the action of the end of a plastic bag being closed to engage with an end of stroke sensor 18; in response, this sensor sends an impulse to the electronic command and control units which emit a signal which they transmit to the balance to give it authorization to carry out a weighing and labeling operation.

Cette configuration permet d'empêcher de façon sûre tout risque de fraude.  This configuration safely prevents any risk of fraud.

Claims (7)

REVENDICATIONS 1) Dispositif de fermeture par soudage de sacs plastiques plus spécialement destiné aux magasins d'alimentation, en particulier aux rayons alimentation des grandes surfaces, caractérisé en ce qu'il est constitué d'une embase (1) sur laquelle sont montés deux éléments de fermeture (3, 4) définissant entre eux une fente de concentration de l'énergie (5) dans laquelle un utilisateur peut engager l'extrémité d'un sac plastique préalablement enroulée en un cordon et la déplacer pour obtenir sa fusion partielle à ce niveau et par suite sa fermeture, à savoir - d'une part un élément émetteur (3) protégé par un capot 1) Closing device by welding of plastic bags more specifically intended for food stores, in particular for supplying supermarkets, characterized in that it consists of a base (1) on which two elements of closure (3, 4) defining between them an energy concentration slot (5) in which a user can engage the end of a plastic bag previously wound in a cord and move it to obtain its partial fusion at this level and consequently its closure, namely - on the one hand a transmitting element (3) protected by a cover (9) en un matériau réfractaire ouvert au droit de la (9) in a refractory material open to the law of the fente de concentration de l'énergie (5) et renfermant à energy concentration slot (5) and containing sa partie interne un émetteur infrarouge (11) coopérant its internal part an infrared transmitter (11) cooperating avec deux rails métalliques (12, 12') se terminant au ni with two metal rails (12, 12 ') ending at the ni veau de la fente de concentration de l'énergie (5) par calf from the energy concentration slot (5) by deux extrémités respectives (13, 13') situées en regard à two respective ends (13, 13 ') located opposite faible distance l'une de l'autre de façon à obtenir un short distance from each other so as to obtain a maximum de températures à ce niveau, et - d'autre part, un élément récepteur (4) réalisé en un ma maximum temperatures at this level, and - on the other hand, a receiving element (4) made of a ma tériau résistant à la température sur lequel est fixée temperature resistant material to which is attached une barre métallique (6) définissant un contre-rail, si a metal bar (6) defining a counter rail, if tuée au droit de la fente de concentration de l'énergie killed at the energy focus slot (5) essentiellement entre les extrémités respectives (13, (5) essentially between the respective ends (13, 13') des rails (12, 12') de l'élément émetteur (3). 13 ') of the rails (12, 12') of the transmitter element (3). 2) Dispositif selon la revendication 1, caractérisé en ce que l'élément émetteur (3) comporte une partie essentiellement parallélépipédique (7) renfermant l'émetteur infrarouge (11) se prolongeant en direction de la fente de concentration de l'énergie (5) par une partie (8) rétrécie obliquement. 2) Device according to claim 1, characterized in that the emitting element (3) comprises an essentially parallelepipedal part (7) enclosing the infrared emitter (11) extending in the direction of the energy concentration slot (5 ) by a part (8) narrowed obliquely. 3) Dispositif selon l'une quelconque des revendications 1 et 2, caractérisé en ce que l'élément récepteur (4) est constitué par un bloc de polytétrafluoréthylène.  3) Device according to any one of claims 1 and 2, characterized in that the receiving element (4) consists of a block of polytetrafluoroethylene. 4) Dispositif selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la fente de concentration de l'énergie (5) a une largeur comprise entre 3 et 10 mm. 4) Device according to any one of claims 1 to 3, characterized in that the energy concentration slot (5) has a width between 3 and 10 mm. 5) Dispositif selon l'une quelconque des revendications 1 à 4, caractérisé en ce que l'émetteur infrarouge (11) coopère avec des organes de commande et de régulation électronique situés à la partie interne de l'embase (1). 5) Device according to any one of claims 1 to 4, characterized in that the infrared transmitter (11) cooperates with electronic control and regulation members located at the internal part of the base (1). 6) Dispositif selon l'une quelconque des revendications 1 à 5, plus spécialement destiné aux rayons d'alimentation en libre service des grandes surfaces en particulier aux rayons fruits et légumes dans lesquels l'utilisateur place lui-même les produits qu'il désire acheter dans un sac plastique transparent qu'il ferme avant de le peser sur une balance équipée d'un dispositif d'étiquetage, dispositif caractérisé en ce qu'il comporte des moyens de détection sensibles à la présence dans la fente de concentration de l'énergie (5) d'un sac plastique ayant été fermé par soudage et coopérant avec la balance de façon à lui transmettre en réponse un signal l'autorisant à effectuer une pesée et à distribuer une étiquette. 6) Device according to any one of claims 1 to 5, more especially intended for self-service supply shelves of large areas in particular to fruit and vegetable shelves in which the user places himself the products he desires buy in a transparent plastic bag that it closes before weighing it on a scale equipped with a labeling device, device characterized in that it includes detection means sensitive to the presence in the concentration slot of the energy (5) of a plastic bag having been closed by welding and cooperating with the balance so as to transmit to it in response a signal authorizing it to carry out a weighing and to distribute a label. 7) Dispositif selon la revendication 6, caractérisé en ce que les moyens de détection sont constitués par un barreau métallique (16) soumis à l'action d'un ressort de rappel monté mobile dans l'élément récepteur (4) et susceptible de coulisser le long du contre-rail (6) sous l'action d'un sac déplacé dans la fente de concentration de l'énergie (5) pour venir en prise avec un capteur de fin de course (18) coopérant en réponse avec les organes de commande et de régulation électroniques situés à la partie interne de l'embase (1) pour transmettre à la balance un signal l'autorisant à effectuer une pesée et à distribuer une étiquette.  7) Device according to claim 6, characterized in that the detection means consist of a metal bar (16) subjected to the action of a return spring mounted movably in the receiving element (4) and capable of sliding along the counter rail (6) under the action of a bag displaced in the energy concentration slot (5) to engage with a limit switch (18) cooperating in response with the members electronic control and regulation located on the internal part of the base (1) to transmit to the balance a signal authorizing it to carry out a weighing and to distribute a label.
FR9505766A 1995-05-16 1995-05-16 DEVICE FOR CLOSING BY WELDING PLASTIC BAGS Expired - Fee Related FR2734235B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR9505766A FR2734235B1 (en) 1995-05-16 1995-05-16 DEVICE FOR CLOSING BY WELDING PLASTIC BAGS
FR9604246A FR2734236B1 (en) 1995-05-16 1996-04-04 DEVICE FOR CLOSING BY WELDING PLASTIC BAGS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9505766A FR2734235B1 (en) 1995-05-16 1995-05-16 DEVICE FOR CLOSING BY WELDING PLASTIC BAGS

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FR2734235B1 FR2734235B1 (en) 1997-08-01

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2958367A (en) * 1955-03-11 1960-11-01 Gournelle Maurice Machine for welding plastics
FR1560594A (en) * 1968-02-07 1969-03-21
DE2462180A1 (en) * 1974-02-19 1976-05-06 Focke Pfuhl Verpack Automat Appts for heating sealable zones of package - having infrared radiator with infrared coil partly surrounded by reflector
EP0031129A2 (en) * 1979-12-21 1981-07-01 Icoma Packtechnik GmbH Method of welding the internal layers of multi-layer paper sacks
GB2094707A (en) * 1981-03-18 1982-09-22 Grace W R & Co Process and apparatus for providing a sealed package

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2958367A (en) * 1955-03-11 1960-11-01 Gournelle Maurice Machine for welding plastics
FR1560594A (en) * 1968-02-07 1969-03-21
DE2462180A1 (en) * 1974-02-19 1976-05-06 Focke Pfuhl Verpack Automat Appts for heating sealable zones of package - having infrared radiator with infrared coil partly surrounded by reflector
EP0031129A2 (en) * 1979-12-21 1981-07-01 Icoma Packtechnik GmbH Method of welding the internal layers of multi-layer paper sacks
GB2094707A (en) * 1981-03-18 1982-09-22 Grace W R & Co Process and apparatus for providing a sealed package

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