EP0756262B1 - Dispositif pour soudage thermique de sécurité constitué d'une bande adhésive non-homogène et d'un dispositif d'estampage à chaud, et méthode relative - Google Patents
Dispositif pour soudage thermique de sécurité constitué d'une bande adhésive non-homogène et d'un dispositif d'estampage à chaud, et méthode relative Download PDFInfo
- Publication number
- EP0756262B1 EP0756262B1 EP96830385A EP96830385A EP0756262B1 EP 0756262 B1 EP0756262 B1 EP 0756262B1 EP 96830385 A EP96830385 A EP 96830385A EP 96830385 A EP96830385 A EP 96830385A EP 0756262 B1 EP0756262 B1 EP 0756262B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tape
- temperature
- thermoseal
- hot
- metal plate
- 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.)
- Expired - Lifetime
Links
- 238000007789 sealing Methods 0.000 title claims description 16
- 238000000034 method Methods 0.000 title claims description 12
- 239000002390 adhesive tape Substances 0.000 title claims description 9
- 239000002184 metal Substances 0.000 claims description 13
- 239000000758 substrate Substances 0.000 claims description 10
- 239000000853 adhesive Substances 0.000 claims description 5
- 230000001070 adhesive effect Effects 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 229920000098 polyolefin Polymers 0.000 claims description 4
- 229920005990 polystyrene resin Polymers 0.000 claims description 4
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 239000012815 thermoplastic material Substances 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims description 3
- 230000000750 progressive effect Effects 0.000 claims description 3
- 229920001296 polysiloxane Polymers 0.000 claims description 2
- 238000003892 spreading Methods 0.000 claims description 2
- 241000283216 Phocidae Species 0.000 description 16
- 239000000463 material Substances 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 238000007790 scraping Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000012173 sealing wax Substances 0.000 description 2
- 238000004049 embossing Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
- G09F3/02—Forms or constructions
- G09F3/03—Forms or constructions of security seals
- G09F3/0305—Forms or constructions of security seals characterised by the type of seal used
- G09F3/0341—Forms or constructions of security seals characterised by the type of seal used having label sealing means
Definitions
- the present invention relates to the field of the systems for security sealing parcels and packages.
- Security seals are means whereby a parcel or package cannot be opened and closed again, once sealed, without leaving a visible trace of the tampering.
- stamps of sealing wax or lead overlying the closure line of the parcel were used in the past
- adhesive tapes with overlaid embossing or indelible-ink stamps are mostly used today and applied above all by the most common, quick and easy methods.
- sealing wax stamp or other stamps of the disposable type the method is of applying a seal with a stamp which becomes extremely fragile and is not removable from the sealed parcel without destroying the same. Such a result is the most desirable, however, the above old methods have the problem of the slow application which is not compatible any longer with the presently requested operation times.
- thermolabile tape in which a mark is hot impressed so as to stamp on the surface of the parcel the portion of the tape corresponding to the shown writing or image.
- the Italian Utility Model No. 218137 discloses a hot sealing device for parcels or packages including a metal seal which is heated to a constant predetermined temperature so as to hot impress the desired mark on an adhesive tape which is applied on the surface to be sealed at a suitable temperature of the stamp.
- thermosealing device is connected to the heating element by electric wires and then the use thereof is limited.
- the present invention seeks to overcome the problems of the known thermosealing device described above and allows a quick, easy and secure sealing operation against the most sophisticated methods of removing the tape with the seal.
- Such a result is achieved by the present invention by combining the temperature of the thermoseal with suitable thermolabile and not homogeneous characteristics of the used tape structure so that the chemical-physical state of the tape is changed by the stamp only at the area of the mark, and the integrity and the continuity of the tape is impaired so as to cause the tape to enter the underlying support and to prevent the seal from being completely removed even by resorting to cooling methods by Freon.
- a silicone paper substrate to be removed upon using the tape is applied during the manufacture in order to increase the fragility of the tape.
- the presence of a paper substrate allows the tape to be preliminarily tagged with a succession of labels of suitable size for sealing a cover. The numbering of such labels will greatly increase the security as a progressive and/or series numbering indicates the right number designating a given cover which cannot be reproduced.
- a convenient amount of air bells is distributed into the tape used for applying the thermoseal according to the invention.
- the volume per cent ratio to the material of the tape is determined in combination with the temperature of the applied thermoseal at which the evaporation of the air bells from the film, the hardening of the tape, and the penetration of the adhesive into the treated surface occur.
- the evaporation of the air bells causes the onset of preferential breakage lines in the area of the mark which are not formed again by the melting of the material due to the hardening of the thermoplastic material and prevent the seal from being completely removed unless by mechanical scraping.
- a metal plate thermoseal provided with a self-control device to keep the temperature at a constant level is used. Such a thermoseal is connected to the power supply by a non-wired connector so that it may be used without electric cables.
- a first advantage is that the evaporation of the air bubbles along with the penetration into the thermoplastic substrate make the tampering method by cooling the seal, for example by Freon, ineffective as the sealed portion of the mark is integral with the surface of the substrate.
- a second advantage is that the mechanical scraping necessary to completely remove the seal leaves a visible trace on the surface of the parcel with which it is than impossible to fraudulently tamper.
- a third advantage is given by that the mark on the tape is very well visible.
- a last advantage is given by the easiness and the rapidity of use of such a sealing apparatus which does not need any electrical connecting cables between the stamp and the power supply.
- the apparatus includes a tape consisting of a semitransparent film 3 of thermoplastic material carrying on one face a layer of adhesive material, preferably provided with a coloured pigment. During the manufacturing of the tape, air bubbles 1 are blown into film 3 and remain captured in the thickness of the tape so as to cause a non-homogeneity.
- the hot sealing apparatus of the invention also includes a thermoseal 5 carrying at the lower side a metal plate 4 for affixing the mark. Thermoseal 5 is provided with devices for controlling the temperature of plate 4 which ensure the desired temperature to be reached and kept by heating and control operations.
- such a self-control device is a positive temperature coefficient device known per se the operation of which is controlled by the temperature/resistance diagram shown in Fig. 3 so as to keep the threshold temperature T1 of plate 4.
- Fig. 2 such positive temperature coefficient device is embodied in the thermoseal 5 and is provided with a connector 6 for the connection to a corresponding socket 6' on the support 10.
- Support 10 is in turn provided with a 24/48 V power supply 7 and light emitting diodes (LED) 8 and 9 which indicate on/off operation and the achievement of the threshold temperature, respectively.
- LED light emitting diodes
- thermoseal 5 is placed on support 10 connected to power supply 7, and connector 6 is plugged in socket 6' so that LEDs 8 and 9 are both lighting, thus indicating the connection to the power supply and a temperature which is still too low for sealing purposes, respectively.
- the positive temperature coefficient device has initially a very low resistance so that a very high current is flowing and then the desired temperature T1 of plate 4 is reached within short. Once temperature T1 is reached, the resistance of the positive temperature coefficient device increases only to supply the balance power to compensate the heat loss in the metal plate 4. Afterwards, the power supplied by the positive temperature coefficient device is self-controlled by keeping the desired temperature T1 unchanged, thus causing LED 9 to switch off.
- temperature T1 of metal plate 4 is related to the thermolabile characteristics of tape 3 and the volume per cent amount of the blown air bubbles 1. More particularly, regarding the thermolabile characteristic of tape 3, the temperature of the sealing plate 4 should be high enough to cause air bells 1 to evaporate and low enough not to cause the tape adjacent the air bells to excessively melt, with the result of re-establish the continuity of the material around the mark. Accordingly, when plate 4 is superimposed to tape 3 applied on the surface to be sealed, the established temperature T1 is such that the chemical-physical characteristics of tape 3 change and the air bells 1 evaporate from the tape causing preferential fracture lines to be formed.
- the tape hardens without reestablishing, however, the continuity of the tape at the fracture lines.
- the adhesive enters the surface of the parcel to be sealed so as to form the image of mark 2 which is shown, by way of example, in Fig. 1 in the form of a circular ring 2.
- the onset of preferential fracture lines breaks the continuity of the tape and prevents the tape from being removed unless by mechanical scraping.
- the characteristics of the material, the per cent amount of blown air, and the temperature of the sealing plate are combined as follows:
- the present invention also relates to a method of sealing parcel and packages by a thermolabile adhesive tape and a metal plate seal heated at a predetermined temperature.
- the method besides the steps of spreading the tape on the surface to be sealed and affixing a thermoseal to the tape, includes a preliminary step of intentionally forming non-homogeneous areas on the tape, and a step of establishing a temperature of the thermoseal in combination with the thermolabile characteristics of such tape, in order to cause the onset of preferential fracture lines from said non-homogeneous areas near the mark which are operating in case of a tape tampering attempt.
- said step of forming non-homogeneous areas on the tape is carried out by blowing into the tape an amount of air bubbles of about 40% vol. of the raw material used for manufacturing the tape which is preferably formed of polystyrene resins, PVC or polyolefins, while said step of hot impressing is carried out at a temperature of the metal plate seal of about 200°C.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Package Closures (AREA)
Claims (12)
- Appareil pour le soudage thermique de paquets ou colis comprenant une bande de matière thermoplastique adhésive (3) et un dispositif pour apposer un thermoscellement sur la bande au moyen d'une thermoempreinte (4) formée d'une plaque de métal préchauffée portant une empreinte (2) en relief à apposer à la surface du paquet, caractérisé en ce que cette bande présente intentionnellement des zones non homogènes formées en combinaison avec les caractéristiques thermolabiles du matériel thermoplastique de la bande (3) et la température de cette thermoempreinte formée d'une plaque de métal, de manière à altérer l'intégrité et la continuité de la bande après y avoir apposé le thermoscellement et uniquement dans la zone dans laquelle l'empreinte (2) est estampée, et de manière à favoriser l'apparition précoce de lignes de fracture préférentielles dans la zone et de provoquer la pénétration de la bande dans le substrat sous-jacent sur lequel l'empreinte est appliquée, empêchant ainsi la bande d'être retirée complètement du substrat; les zones non homogènes étant formées de bulles d'air (1) soufflées dans l'épaisseur de la bande (3), la température de cette plaque métallique d'empreinte (4) du thermoscellement (5) étant maintenue à un niveau constant (T1).
- Appareil selon la revendication 1, caractérisé en ce que la bande (3) est réalisée dans des résines de polystyrène, du PVC ou des polyoléfines.
- Appareil selon la revendication 1, caractérisé en ce que le pourcentage en quantité d'air soufflé à l'intérieur de la bande (3) correspond à environ 40 % en volume du matériel brut utilisé pour fabriquer la bande (3).
- Appareil selon l'une quelconque des revendications précédentes, caractérisé en ce que la bande (3) est fabriquée sur un substrat (12) en papier de silicone, à retirer à l'usage.
- Appareil selon la revendication 1, caractérisé en ce que la bande (3) est préalablement étiquetée avec une succession de tickets ou d'étiquettes en vue du scellement, ces tickets ou étiquettes portant une numérotation progressive et/ou sérielle.
- Appareil selon la revendication 1, caractérisé en ce que le niveau constant de température (T1) de la plaque (4) est d'environ 200°C.
- Appareil selon la revendication 1, caractérisé en ce que le thermoscellement (5) comporte un dispositif à coefficient de température positive relié électriquement par des moyens sans fils (6, 6') à un support (10) relié à son tour à une alimentation électrique (7) de manière à maintenir la température de la plaque (4) au niveau constant (T1).
- Appareil selon la revendication 7, caractérisé en ce que l'alimentation électrique (7) est de 24/48 Volts.
- Procédé pour sceller à chaud des paquets et colis par une bande adhésive thermolabile et une thermoempreinte formée d'une plaque de métal chauffée à une température prédéterminée, comprenant les étapes consistant à étendre la bande sur la surface à sceller et à apposer un thermoscellement sur la bande, caractérisé en ce qu'il comprend une étape préliminaire consistant à former intentionnellement des zones non homogènes sur la bande, et une étape consistant à établir une température du thermoscellement en combinaison avec les caractéristiques thermolabiles de cette bande, de manière à provoquer l'apparition précoce de lignes de fracture préférentielles correspondant aux zones non homogènes près de l'empreinte après apposition de la thermoempreinte; l'étape consistant à former des zones non homogènes sur la bande étant réalisée en soufflant à l'intérieur de la bande un pourcentage prédéterminé en quantité de bulles d'air.
- Procédé selon la revendication 9, caractérisé en ce que la bande est réalisée dans des résines de polystyrène, du PVC ou des polyoléfines, le pourcentage prédéterminé de bulles d'air soufflées durant l'étape de soufflage correspondant à environ 40% en volume du matérieau brut utilisé pour fabriquer la bande.
- Procédé selon la revendication 9, caractérisé en ce que l'apposition à chaud est effectuée à une température constante (T1) de la thermoempreinte (4) formée d'une plaque de métal.
- Procédé selon la revendication 11, caractérisé en ce que la température constante (T1) de la thermoempreinte (4) formée d'une plaque de métal est d'environ 200°C.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITRM950460 | 1995-07-06 | ||
IT95RM000460A IT1278130B1 (it) | 1995-07-06 | 1995-07-06 | Apparato di sigillatura di sicurezza composto da un nastro adesivo a struttura disomogenea e da un dispositivo di impressione a caldo di |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0756262A2 EP0756262A2 (fr) | 1997-01-29 |
EP0756262A3 EP0756262A3 (fr) | 1998-10-21 |
EP0756262B1 true EP0756262B1 (fr) | 2002-04-03 |
Family
ID=11403462
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96830385A Expired - Lifetime EP0756262B1 (fr) | 1995-07-06 | 1996-07-05 | Dispositif pour soudage thermique de sécurité constitué d'une bande adhésive non-homogène et d'un dispositif d'estampage à chaud, et méthode relative |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0756262B1 (fr) |
DE (1) | DE69620311D1 (fr) |
IT (1) | IT1278130B1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19929532C2 (de) * | 1999-06-28 | 2002-12-05 | Sanacorp Ag | Plombierung eines wiederverwendbaren, aus Behälterwanne und Deckel bestehenden Transportbehälters |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB497431A (en) * | 1937-06-21 | 1938-12-20 | Arturo Baderna | Improvements in adhesive seals |
FR2533195B1 (fr) * | 1982-09-22 | 1986-05-09 | Sifar Sa | Procede d'apposition d'une vignette inviolable sur un recipient d'emballage a usage unique; recipient d'emballage muni d'une telle vignette; et machine pour l'apposition d'une telle vignette sur un recipient d'emballage |
IT8747756A0 (it) * | 1987-03-20 | 1987-03-20 | Biancone Patrizia | Dispositivo per la sigillatura di plichi, pacchi e simili, mediante impressione a caldo su nastro adesivo termolabile |
FR2651180B1 (fr) * | 1989-08-31 | 1991-12-13 | Paris Banque Nale | Appareil a marquer a chaud un ruban adhesif. |
-
1995
- 1995-07-06 IT IT95RM000460A patent/IT1278130B1/it active IP Right Grant
-
1996
- 1996-07-05 DE DE69620311T patent/DE69620311D1/de not_active Expired - Lifetime
- 1996-07-05 EP EP96830385A patent/EP0756262B1/fr not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0756262A2 (fr) | 1997-01-29 |
IT1278130B1 (it) | 1997-11-17 |
DE69620311D1 (de) | 2002-05-08 |
EP0756262A3 (fr) | 1998-10-21 |
ITRM950460A1 (it) | 1997-01-06 |
ITRM950460A0 (it) | 1995-07-06 |
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