FR2523080A1 - INVIOLABLE BAG AND ITS CLOSING METHOD - Google Patents

INVIOLABLE BAG AND ITS CLOSING METHOD Download PDF

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Publication number
FR2523080A1
FR2523080A1 FR8204262A FR8204262A FR2523080A1 FR 2523080 A1 FR2523080 A1 FR 2523080A1 FR 8204262 A FR8204262 A FR 8204262A FR 8204262 A FR8204262 A FR 8204262A FR 2523080 A1 FR2523080 A1 FR 2523080A1
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France
Prior art keywords
bag
weld
pattern
inscription
welding
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Pending
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FR8204262A
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French (fr)
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Individual
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Individual
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Priority to FR8204262A priority Critical patent/FR2523080A1/en
Publication of FR2523080A1 publication Critical patent/FR2523080A1/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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • 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
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/306—Applying a mark during joining
    • B29C66/3062—Applying a mark during joining in the form of letters or numbers
    • B29C66/30621—Applying a mark during joining in the form of letters or numbers in the form of letters
    • 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
    • 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
    • B29C66/849—Packaging machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/16—End- or aperture-closing arrangements or devices
    • B65D33/25—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners
    • B65D33/2508—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor
    • B65D33/2584—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor characterized by the slider
    • B65D33/2585—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor characterized by the slider being provided with tamper-indicating means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/04—Dielectric heating, e.g. high-frequency welding, i.e. radio frequency welding of plastic materials having dielectric properties, e.g. PVC
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • 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
    • B29C65/745—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 a single unit having both a severing tool and a welding tool
    • 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
    • B29C66/70—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
    • B29C66/733—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 optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence
    • B29C66/7336—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 optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence at least one of the parts to be joined being opaque, transparent or translucent to visible light
    • B29C66/73365—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 optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence at least one of the parts to be joined being opaque, transparent or translucent to visible light at least one of the parts to be joined being transparent or translucent to visible light
    • B29C66/73366—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 optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence at least one of the parts to be joined being opaque, transparent or translucent to visible light at least one of the parts to be joined being transparent or translucent to visible light both parts to be joined being transparent or translucent to visible light
    • 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
    • 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
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B29K2023/0608—PE, i.e. polyethylene characterised by its density
    • B29K2023/065—HDPE, i.e. high density polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7128—Bags, sacks, sachets

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)

Abstract

Flexible thermoplastic bag is sealed with a full width transverse weld with a decorative or informative pattern embossed along the surface of the weld. Use of a distinctive weld surface pattern inhibits interference with and covert reinstatement or replacement of the weld using other welding equipment. Esp. applicable to bags made of high pressure polyethylene or polypropylene of the pattern used for holding money and having the mouth weld set in from the edges of the mouth with a slit border to assist subsequent splitting of the weld. Opt. the base of the bag is also sealed by a charactertistically embossed transverse weld.

Description

Sac inviolable et son procédé de fermeture.Tamper-evident bag and its closing process.

L'invention concerne un sac du type inviolable, utilisable dans l'industrie pharmaceutique, l'industrie alimentaire et notamment pour le conditionnement de pièces de monnaie.The invention relates to a bag of the inviolable type, usable in the pharmaceutical industry, the food industry and in particular for the packaging of coins.

On connaît déjà des sacs dits "inviolables" qui sont réalisés en un matériau quelconque, par exemple en matière plastique ou en toile, et qui comprennent une extrémité ouverte destinée a être fermée, après remplissage du sac, de façon inviolable ou quasi inviolable. Dans le cas où le sac est en matière plastique, son extrémité ouverte est fermée par une ligne de soudure tandis que, si le sac est en toile, par exemple en toile de jute, son extrémité de remplissage est fermée au moyen d'un cordonnet pourvu de plombs de scellement.So-called “inviolable” bags are already known which are made of any material, for example plastic or canvas, and which comprise an open end intended to be closed, after filling the bag, in an inviolable or almost inviolable manner. In the case where the bag is made of plastic, its open end is closed by a weld line while, if the bag is made of canvas, for example of burlap, its filling end is closed by means of a cord provided with sealing seals.

On a constaté en pratique que ces sacs prétendus inviolables pouvaient être ouverts et refermés, après prélèvement d'une partie de leur contenu, sans que ces opérations soient immédiatement décelables lors d'une inspection rapide. Dans le cas d'un sac en matière plastique, il est facile de couper le sac au voisinage immédiat de la ligne de soudure fermant son extrémité de remplissage, et de refermer ensuite le sac par une ligne de soudure plus ou moins identique. Dans le cas d'un sac en toile, il est facile de l'inciser et de recoudre ensuite la ligne d'incision. It has been found in practice that these so-called inviolable bags could be opened and closed, after part of their contents have been removed, without these operations being immediately detectable during a rapid inspection. In the case of a plastic bag, it is easy to cut the bag in the immediate vicinity of the weld line closing its filling end, and then to close the bag with a more or less identical weld line. In the case of a canvas bag, it is easy to incise it and then sew up the incision line.

L'invention a pour but un sac inviolable qui ne présente aucun de ces inconvénients.The object of the invention is a tamper-evident bag which does not have any of these drawbacks.

Elle propose a cet effet un sac du type inviolable, réalisé en un matériau soudable ou thermosoudable et comprenant à une extrémité une ouverture de remplissage, caractérisé en ce que cette ouverture est fermée, après remplissage du sac, par une bande de soudure s'étendant sur toute l'étendue de l'ouverture et comportant une inscription ou un motif gravé lors de la soudure.To this end, it offers a bag of the inviolable type, made of a weldable or heat-weldable material and comprising at one end a filling opening, characterized in that this opening is closed, after filling the bag, by a strip of welding extending over the entire extent of the opening and comprising an inscription or an engraved pattern during the welding.

La présence de cette inscription ou de ce motif gravé dans la bande de soudure fermant l'extrémité de remplissage du sac rend beaucoup plus difficile toute tentative d'ouverture et de fermeture frauduleuse du sac en raison de la diffi culté a reproduire l'inscription ou le motif gravé avec des moyens de fortune, d'une façon qui ne soit pas décelable lors d'une inspection.The presence of this inscription or of this engraved pattern in the sealing strip closing the filling end of the bag makes any attempt to fraudulently open and close the bag much more difficult because of the difficulty in reproducing the inscription or the motif engraved with makeshift means, in a way that was not detectable during an inspection.

Selon d'autres caractéristiques de l'invention, le fond du sac opposé'a ladite ouverture de remplissage est fermé également par une bande de soudure comprenant une inscription ou un motif grave lors de la soudure.According to other features of the invention, the bottom of the bag opposite to said filling opening is also closed by a welding strip comprising an inscription or a serious pattern during the welding.

Selon d'autres caractéristiques de l'invention, le sac est en matériau plastique thermosoudable, par exemple tel qu'un polyéthylène haute pression, éventuellement chargé, ou en polypropylène, et est par exemple transparent.According to other characteristics of the invention, the bag is made of heat-sealable plastic material, for example such as high pressure polyethylene, optionally loaded, or of polypropylene, and is for example transparent.

L'invention propose également un procédé de fermeture d'un sac du type qui vient d'être décrit, caractérisé en ce qu'il consiste a fermer l'ouverture d'extrémité du sac, après remplissage, par soudure au moyen d'au moins une électrode de soudure pressée sur le sac le long de l'ouverture d'extrémité et comportant une inscription ou un motif gravé en creux.The invention also provides a method of closing a bag of the type which has just been described, characterized in that it consists in closing the end opening of the bag, after filling, by welding by means of minus a welding electrode pressed on the bag along the end opening and having an inscription or a hollow engraved pattern.

Lors de la soudure, le matériau du sac vient remplir les creux formant l'inscription ou le motif gravé dans l'électrode, de sorte que la bande de soudure ainsi obtenue comporte une inscription ou un motif gravé en relief.During the welding, the material of the bag fills the hollows forming the inscription or the pattern engraved in the electrode, so that the weld strip thus obtained comprises an inscription or a pattern engraved in relief.

Dans la description qui suit, faite à titre d'exemple, on se réfère aux dessins annexés, dans lesquels
La figure 1 est une vue schématique en plan d'un sac inviolable selon l'invention.In the description which follows, given by way of example, reference is made to the appended drawings, in which
Figure 1 is a schematic plan view of a tamper-evident bag according to the invention.

La figure 2 représente schématiquement l'étape de fermeture d'un sac selon l'invention.FIG. 2 schematically represents the step of closing a bag according to the invention.

Le sac 10 représenté en figure 1 est de forme par exemple rectangulaire et comprend alors deux grandes parois 11 réunies entre elles, au fond 12 du sac, par une bande de soudure 13 s'étendant sur toute la largeur du sac et comprenant une inscription ou un motif 14 gravé lors de la soudure.The bag 10 shown in FIG. 1 is for example rectangular in shape and then comprises two large walls 11 joined together, at the bottom 12 of the bag, by a weld strip 13 extending over the entire width of the bag and comprising an inscription or a pattern 14 engraved during the welding.

La bande de soudure 13 a une largeur appropriée, par exemple d'un centimètre, et est tangente au fond du sac ou légèrement écartée de celui-ci.The weld strip 13 has an appropriate width, for example of a centimeter, and is tangent to the bottom of the bag or slightly spaced therefrom.

L'extrémité du sac opposée à la bande de soudure 13 est ouverte et forme l'extrémité de remplissage.The end of the bag opposite the weld strip 13 is open and forms the filling end.

Les deux cotés longitudinaux 15 du sac peuvent comprendre des soufflets si nécessaire.The two longitudinal sides 15 of the bag can include bellows if necessary.

Le sac peut être formé à partir d'un tube de matière, de sorte qu'il n'est pas nécessaire que ses cotés longitudinaux 15 soient fermés ultérieurement par soudure ou analogue.The bag can be formed from a tube of material, so that its longitudinal sides do not have to be closed later by welding or the like.

Après remplissage du sac, son extrémité ouverte 16 est fermée par une bande de soudure 17 s'étendant sur toute la largeur du sac et comportant également une inscription ou un motif 18 gravé lors de la soudure. Avantageusement, la bande de soudure 17 est écartée de l'extrémité ouverte 16 du sac d'une distance appropriée et une incision longitudinale 19 est formée, dans les deux parois du sac, de l'extrémité ouverte 16 du sac jusqu' la bande de soudure 17 ou jusqu'au voisinage de celle-ci. Cette incision ou ligne de pré-découpe permet d'ouvrir plus facilement le sac.After filling the bag, its open end 16 is closed by a weld strip 17 extending over the entire width of the bag and also comprising an inscription or a pattern 18 engraved during welding. Advantageously, the weld strip 17 is spaced from the open end 16 of the bag by an appropriate distance and a longitudinal incision 19 is formed, in the two walls of the bag, from the open end 16 of the bag to the strip of weld 17 or to the vicinity thereof. This incision or pre-cut line makes it easier to open the bag.

On a schématiquement représenté en figure 2 le procédé de fermeture du sac après remplissage. Le sac 10, contenant un certain nombre d'articles ou de pièces 20, est transporté, par exemple à plat, jusqu'à un poste de fermeture 21 comprenant une pièce inférieure d'appui 22 supportant l'extrémité ouverte 16 du sac, une électrode supérieure de soudure 23 et un couteau ou analogue 24 destiné à former l'incision ou la ligne de pré-découpe longitudinale 19.Schematically shown in Figure 2 the method of closing the bag after filling. The bag 10, containing a certain number of articles or parts 20, is transported, for example flat, to a closing station 21 comprising a lower support part 22 supporting the open end 16 of the bag, a upper welding electrode 23 and a knife or the like 24 intended to form the incision or the longitudinal precut line 19.

Lorsque le sac 10 est dans la position représentée en figure 2, l'électrode 23 est alimentée en courant et est descendue pour être pressée sur toute la largeur du sac au voisinage de l'extrémité ouverte 16. La face inférieure de l'électrode 23 comporte, gravé en creux, l'inscription ou le motif voulu. Lors de la soudure, le matériau du sac ramollit et remplit les creux formés dans la face inférieure de l'électrode de soudure 23. Après la soudure, l'électrode 23 est relevée, et le sac 10 est emmené.When the bag 10 is in the position shown in FIG. 2, the electrode 23 is supplied with current and is lowered to be pressed over the entire width of the bag in the vicinity of the open end 16. The underside of the electrode 23 includes, engraved intaglio, the desired inscription or motif. When welding, the bag material softens and fills the recesses formed in the underside of the welding electrode 23. After welding, the electrode 23 is raised, and the bag 10 is taken away.

La bande de soudure 13 qui ferme le fond du sac, est formée de la même façon.The weld strip 13 which closes the bottom of the bag is formed in the same way.

Comme indiqué plus haut, un sac inviolable selon l'invention est en matériau soudable ou thermosoudable, par exemple en polyéthylène haute pression chargé d'éthylène-vinyle-acétate, en polypropylène, en chlorure de polyvinyle (soudable par ultrasons ou haute fréquence), etc. Avantageusement, le matériau utilisé pour réaliser le sac selon l'invention est transparent, ce qui facilite les contrôles visuels.As indicated above, a tamper-evident bag according to the invention is made of weldable or heat-sealable material, for example of high pressure polyethylene loaded with ethylene-vinyl-acetate, of polypropylene, of polyvinyl chloride (weldable by ultrasound or high frequency), etc. Advantageously, the material used to make the bag according to the invention is transparent, which facilitates visual checks.

L'inscription ou le motif gravé dans les bandes de soudure peut être le nom, la marque ou le sigle du fabricant ou du propriétaire du produit contenu dans le sac, etc. Lorsque de tels sacs sont utilisés dans l'industrie pharmaceutique ou alimentaire, l'inscription ou le motif gravé peut comprendre un numéro de lot, une date de conditionnement, etc. The inscription or the pattern engraved in the sealing strips can be the name, the brand or the acronym of the manufacturer or of the owner of the product contained in the bag, etc. When such bags are used in the pharmaceutical or food industry, the inscription or the engraved motif may include a lot number, a date of packaging, etc.

Claims (9)

Revendications.Claims. 1. Sac inviolable, réalisé en matériau soudable ou thermosoudable et comprenant à une extrémité une ouverture de remplissage, caractérisé en ce que cette ouverture (16) est fermée, après remplissage du sac (10), par une bande de soudure (17) s'étendant sur toute l'étendue de l'ouverture et comportant une inscription ou un motif (18) gravé lors de la soudure.1. Tamper-evident bag, made of weldable or heat-sealable material and comprising at one end a filling opening, characterized in that this opening (16) is closed, after filling the bag (10), by a strip of solder (17) s 'extending over the entire extent of the opening and comprising an inscription or a pattern (18) engraved during the welding. 2. Sac selon la revendication 1, caractérisé en ce que le fond (12) du sac, opposé à ladite ouverture de remplissage (16), est fermé par une bande de soudure (13) comprenant également une inscription ou un motif (14) gravé lors de la soudure.2. Bag according to claim 1, characterized in that the bottom (12) of the bag, opposite to said filling opening (16), is closed by a strip of solder (13) also comprising an inscription or a pattern (14) engraved during welding. 3. Sac selon la revendication 1 ou 2, caractérisé en ce que l'inscription ou le motif (14, 18) est gravé en relief dans la bande de soudure (13, 17).3. Bag according to claim 1 or 2, characterized in that the inscription or the pattern (14, 18) is engraved in relief in the weld strip (13, 17). 4. Sac selon l'une des revendications précédentes, caractérisé en ce qu'il est en une matière plastique thermosoudable telle qu'un polyéthylène haute pression ou du polypropylène.4. Bag according to one of the preceding claims, characterized in that it is made of a heat-sealable plastic material such as high pressure polyethylene or polypropylene. 5. Sac selon l'une des revendications précédentes, caractérisé en ce qu'il est en matériau transparent.5. Bag according to one of the preceding claims, characterized in that it is made of transparent material. 6. Sac selon l'une des revendications précédentes, caractérisé en ce que la bande de soudure (17) fermant l'ouverture de remplissage du sac (10) est à distance de l'extrémité transversale ouverte (16) du sac.6. Bag according to one of the preceding claims, characterized in that the weld strip (17) closing the bag filling opening (10) is at a distance from the open transverse end (16) of the bag. 7. Sac selon la revendication 6, caractérisé en ce qu'une fente, incision ou ligne de prédécoupé (19) est formée dans les parois du sac (10) entre ladite extrémité ouverte du sac et la bande de soudure correspondante (17). 7. Bag according to claim 6, characterized in that a slot, incision or pre-cut line (19) is formed in the walls of the bag (10) between said open end of the bag and the corresponding weld strip (17). 8. Sac selon l'une des revendications précédentes, caractérisé en ce qu'il est utilisé pour le transport de pièces de monnaie.8. Bag according to one of the preceding claims, characterized in that it is used for the transport of coins. 9. Procédé de fermeture d'un sac selon l'une des revendications précédentes, caractérisé en ce qu'il consiste à fermer l'ouverture d'extrémité (16) du sac (10), après remplissage, par soudure au moyen d'au moins une électrode de soudure (23) pressée sur le sac le long de l'ouverture d'extrémité (16) et comportant une inscription ou un motif gravé en creux. 9. Method for closing a bag according to one of the preceding claims, characterized in that it consists in closing the end opening (16) of the bag (10), after filling, by welding by means of at least one welding electrode (23) pressed on the bag along the end opening (16) and comprising an inscription or a hollow engraved pattern.
FR8204262A 1982-03-12 1982-03-12 INVIOLABLE BAG AND ITS CLOSING METHOD Pending FR2523080A1 (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0298054A2 (en) * 1987-07-02 1989-01-04 Sales S.p.A. Device for opening and closing sealed packets containing food products in pieces, particularly sweets and the like
EP0450960A2 (en) * 1990-04-04 1991-10-09 Oscar Mayer Foods Corporation Package having engraved lettering peel seal tamper-evidence message
EP0852279A2 (en) * 1997-01-04 1998-07-08 Bavak Beveiligingsgroep B.V. Assembly for storing paper money in a container, as well as container and housing for a container of this kind
WO2001004014A1 (en) * 1999-07-09 2001-01-18 Sealed Air Corporation (Us) Article with improved tamper evidence
EP1844920A2 (en) * 2006-04-12 2007-10-17 Kallfass Verpackungsmaschinen GmbH Welding means, welding device and method for manufacturing film packaging
GB2491561A (en) * 2011-05-20 2012-12-12 L C S Tech Ltd Tamper proof seal

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1411062A (en) * 1964-06-24 1965-09-17 Restello Ab Tamper-evident seal
GB1334831A (en) * 1972-03-08 1973-10-24 Decoflex Ltd Bags
FR2190684A1 (en) * 1972-06-28 1974-02-01 Unilever Nv
US3933304A (en) * 1974-02-22 1976-01-20 Decoflex Limited Bags for containing bank notes

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1411062A (en) * 1964-06-24 1965-09-17 Restello Ab Tamper-evident seal
GB1334831A (en) * 1972-03-08 1973-10-24 Decoflex Ltd Bags
FR2190684A1 (en) * 1972-06-28 1974-02-01 Unilever Nv
US3933304A (en) * 1974-02-22 1976-01-20 Decoflex Limited Bags for containing bank notes

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0298054A2 (en) * 1987-07-02 1989-01-04 Sales S.p.A. Device for opening and closing sealed packets containing food products in pieces, particularly sweets and the like
EP0298054A3 (en) * 1987-07-02 1990-02-07 Sales Spa Device for opening and closing sealed packets containing food products in pieces, particularly sweets and the like
EP0450960A2 (en) * 1990-04-04 1991-10-09 Oscar Mayer Foods Corporation Package having engraved lettering peel seal tamper-evidence message
EP0450960A3 (en) * 1990-04-04 1992-01-22 Oscar Mayer Foods Corporation Package having engraved lettering peel seal tamper-evidence message
EP0852279A2 (en) * 1997-01-04 1998-07-08 Bavak Beveiligingsgroep B.V. Assembly for storing paper money in a container, as well as container and housing for a container of this kind
NL1004930C2 (en) * 1997-01-04 1998-07-20 Bavak Beveiligingsgroep Bv Assembly for storing paper money in a holder, as well as holder and housing for such a holder.
EP0852279A3 (en) * 1997-01-04 1998-09-30 Bavak Beveiligingsgroep B.V. Assembly for storing paper money in a container, as well as container and housing for a container of this kind
WO2001004014A1 (en) * 1999-07-09 2001-01-18 Sealed Air Corporation (Us) Article with improved tamper evidence
US6264033B1 (en) 1999-07-09 2001-07-24 Sealed Air Corporation Article with improved tamper evidence
US6471058B2 (en) 1999-07-09 2002-10-29 Sealed Air Corporation Article with improved tamper evidence
EP1844920A2 (en) * 2006-04-12 2007-10-17 Kallfass Verpackungsmaschinen GmbH Welding means, welding device and method for manufacturing film packaging
EP1844920A3 (en) * 2006-04-12 2009-11-18 Kallfass Verpackungsmaschinen GmbH Welding means, welding device and method for manufacturing film packaging
GB2491561A (en) * 2011-05-20 2012-12-12 L C S Tech Ltd Tamper proof seal

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