EP0756262A2 - 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 PDF

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Publication number
EP0756262A2
EP0756262A2 EP96830385A EP96830385A EP0756262A2 EP 0756262 A2 EP0756262 A2 EP 0756262A2 EP 96830385 A EP96830385 A EP 96830385A EP 96830385 A EP96830385 A EP 96830385A EP 0756262 A2 EP0756262 A2 EP 0756262A2
Authority
EP
European Patent Office
Prior art keywords
tape
temperature
thermoseal
hot
seal
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
EP96830385A
Other languages
German (de)
English (en)
Other versions
EP0756262A3 (fr
EP0756262B1 (fr
Inventor
Sandro Biancone
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
METALPRODOTTI Srl
Original Assignee
METALPRODOTTI Srl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by METALPRODOTTI Srl filed Critical METALPRODOTTI Srl
Publication of EP0756262A2 publication Critical patent/EP0756262A2/fr
Publication of EP0756262A3 publication Critical patent/EP0756262A3/fr
Application granted granted Critical
Publication of EP0756262B1 publication Critical patent/EP0756262B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 bells 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.
  • 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 bells 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 re-establishing, 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 bells 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.

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  • 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)
EP96830385A 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 Expired - Lifetime EP0756262B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
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
ITRM950460 1995-07-06

Publications (3)

Publication Number Publication Date
EP0756262A2 true EP0756262A2 (fr) 1997-01-29
EP0756262A3 EP0756262A3 (fr) 1998-10-21
EP0756262B1 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)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19929532A1 (de) * 1999-06-28 2001-01-11 Sanacorp Ag Transportbehälter

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB497431A (en) * 1937-06-21 1938-12-20 Arturo Baderna Improvements in adhesive seals
FR2533195A1 (fr) * 1982-09-22 1984-03-23 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
FR2651180A1 (fr) * 1989-08-31 1991-03-01 Paris Banque Nale Appareil a marquer a chaud un ruban adhesif.
US5099106A (en) * 1987-03-20 1992-03-24 Patrizia Biancone Parcel sealing device using thermolabile adhesive tape

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB497431A (en) * 1937-06-21 1938-12-20 Arturo Baderna Improvements in adhesive seals
FR2533195A1 (fr) * 1982-09-22 1984-03-23 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
US5099106A (en) * 1987-03-20 1992-03-24 Patrizia Biancone Parcel sealing device using thermolabile adhesive tape
FR2651180A1 (fr) * 1989-08-31 1991-03-01 Paris Banque Nale Appareil a marquer a chaud un ruban adhesif.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19929532A1 (de) * 1999-06-28 2001-01-11 Sanacorp Ag Transportbehälter
DE19929532C2 (de) * 1999-06-28 2002-12-05 Sanacorp Ag Plombierung eines wiederverwendbaren, aus Behälterwanne und Deckel bestehenden Transportbehälters

Also Published As

Publication number Publication date
ITRM950460A0 (it) 1995-07-06
ITRM950460A1 (it) 1997-01-06
IT1278130B1 (it) 1997-11-17
EP0756262A3 (fr) 1998-10-21
EP0756262B1 (fr) 2002-04-03
DE69620311D1 (de) 2002-05-08

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