DE202013005455U1 - Kit for detecting unauthorized opening of a mail piece - Google Patents

Abstract

Kit for the detection of unauthorized opening of a mail piece, containing • at least one closing liquid for closing mail pieces containing water and a security additive that is not visible by direct inspection, • at least one means for applying the closing liquid to a mail piece, the means being designed such that a defined lateral inhomogeneous distribution of the locking liquid is achieved, • at least one means for visualizing the security additive.

Description

Field of the invention.

The invention relates to a kit for detecting unauthorized opening of a mail item containing at least one sealing liquid containing a non-visible security additive, at least one means for applying the sealing liquid to a mail piece, wherein the means is designed such that a defined laterally inhomogeneous distribution of the sealing liquid and at least one means of visualizing the safety additive.

Background of the invention and prior art.

Mail pieces, in particular letters, are usually automatically closed and franked by a shipper when there is a high volume of mail pieces to be sent. For this purpose, inter alia, closing devices and franking machines are used, wherein both components are often connected to each other and sometimes form structural units. By way of example, reference is made to the reference DE 20 2004 011 390 U1 directed.

In connection with the closing of mail items whose closure tabs are provided with a rubber coating, it is necessary to moisten the rubber coating before closing. For this purpose, a closing liquid (automatically) is applied to the gumming by means of a moistening sponge. Then, immediately after the moistening, the closing flap is turned over and pressed against a surface of the mail piece opposite the rubber coating and thus bonded.

From practice various closing fluids are known. These are typically water or aqueous solutions that may contain biocides and fungicides on one hand to prevent the formation of germ colonies and unpleasant odors. On the other hand, a wetting agent may be added.

Such sealed mail pieces are usually opened by means of a letter opener or the like, i. e. the mailpiece is slit in the area of an edge and the contents are then removed. However, a person unauthorized to open may open such a mail piece by, for example, being watered or exposed to a water vapor-containing atmosphere. In this case, the adhesive of the gum dissolves in the precipitating in the region of the bond water and the locking tab can be lifted. The unauthorized person can then take note of the contents of the mail piece and then close the mail piece with content by turning over and pressing the closing flap again. With reasonably cautious approach, it is not readily apparent to an authorized person later accepting the mailpiece by inspection that an unauthorized opening of the mailpiece had previously occurred. This bothers for obvious reasons.

From the literature DE 4436294 A1 For example, a sealing liquid is known which contains, in addition to the main component water, a second component of a two-component glue. The first component of the two-component glue is contained in the gum.

From the literature DE 3431239 A1 and DE-G 8716046 are a security letter cover or a security label known, with adhesive areas are arranged such that when (unauthorized) opening irreparable destruction of the label or the envelope takes place, which is then readily apparent by inspection.

From the literature DE-OS 2319866 An insertion machine with moistening device is known.

From the literature EP 07090104.6 For example, a lock-up liquid is known which is applied by means of automatic letter-closing devices (eg, a postage meter with automatic letter-closing device).

Technical problem of the invention.

The invention is based on the technical problem of specifying a kit for detecting unauthorized opening of a mail piece with a sealing liquid which can be applied and detected by simple means without the need for an automatic device.

Broad features of the invention and preferred embodiments.

• • mindestens eine Schließflüssigkeit zum Schließen von Poststücken enthaltend Wasser und ein durch unmittelbare Inaugenscheinnahme nicht sichtbares Sicherheitsadditiv,
• • mindestens ein Mittel zur Auftragung der Schließflüssigkeit auf ein Poststück wobei das Mittel so ausgestaltet ist, dass eine definierte lateral inhomogene Verteilung der Schließflüssigkeit erzielt wird,
• • mindestens ein Mittel zur Visualisierung des Sicherheitsadditivs.

To solve this technical problem, the invention teaches a kit for detecting unauthorized opening of a mailpiece containing

• At least one closing fluid for closing mail items containing water and a safety additive not visible by direct visual inspection,
• At least one means for applying the sealing liquid to a mailpiece, wherein the means is designed such that a defined laterally inhomogeneous distribution of the sealing liquid is achieved,
• • at least one means of visualizing the safety additive.

The term "direct inspection" means the consideration by a person without the aid of technical aids. In contrast, the safety additive is visible-feasible by means of technical aids and / or detectable by means of technical aids. It is therefore a not visible to the naked eye security feature.

The means for applying the sealing liquid to a mail item may be, in particular, a roller, a roller, a stamp or a sponge. The agent is designed so that it has a surface structure. This surface structure may, for example, be in the form of a geometric pattern (eg diamonds, diamonds, triangles, hexagons, but also line patterns, eg straight or curved lines or wave patterns).

The invention is based on the recognition that a pattern can be applied to the gumming of a mail piece by means of the means described above for applying the sealing liquid and that such a pattern is destroyed by exposure to water vapor by deliquescence or blurring. This can be detected easily with a sealing liquid containing a visible dye. In the kit according to the invention, as described in the context of this application, a sealing liquid containing a security additive, which is not visible by direct inspection. The details are explained below. The visualization of this safety additive is carried out by technical aids, as also explained below. Overall, the technical teaching of the invention is to provide a kit for detecting unauthorized opening of a mail piece, which allows the closing of a mail piece, wherein a defined laterally inhomogeneous distribution of the closing liquid and thus of the security additive is achieved, which by using a further technical Aid can be detected.

On the basis of the lateral distribution of the sealing liquid or the security additive contained therein, it can be determined whether the security additive has been destroyed by heat, for example, and / or has been washed out. If this is detected, then that is a sign of an unauthorized opening. If, however, the determined lateral distribution of the sealing liquid or of the safety additive corresponds to a predetermined lateral reference distribution (namely a lateral distribution, as produced during wetting), then an unauthorized opening can in any case be excluded by dissolving the gumming.

The lateral distribution of the closing fluid and thus of the safety additive can be established in various ways as part of the closure of the mail item. For example, a roller or roller superficially containing a pattern may be wetted with the sealing liquid (for example by sponging or a pad containing a sealing liquid) and the sealing liquid then by rolling or rolling over the gummed side of the mailpiece be applied. In this way, a pattern is produced on the mail piece, in particular on the prepared gum, which corresponds to the pattern on the roll or roll. This pattern can be one or two dimensional. Simple one-dimensional patterns are, for example, a sequence of regions in which sealing liquid is applied and regions in which no sealing liquid is applied. The sequence then expediently extends in the direction of the longitudinal extension of the rubber coating. This can be realized, for example, by means of a moistening roller which, like a punch, has areas which do not come into contact with the rubber coating or the mail piece. If such a roll or roll is moistened with recesses and elevations adjoining one another in the circumferential direction and rolled over the gumming, a one-dimensional pattern is produced in the direction of the longitudinal extent of the gumming. Accordingly, a two-dimensional pattern can be created, in which case the means for applying the closing liquid have corresponding recesses and elevations in different directions. Two-dimensional patterns can be simple, such as a checkerboard pattern or even more complicated representations. In the latter case, a result similar to a watermark is obtained. Similarly, the means for applying the sealing liquid may also be a stamp, which in turn has a one- or two-dimensional pattern. In addition, the means for applying the closing fluid may also be a sponge, which also generates a two-dimensional (naturally irregular) pattern through its pore structure.

The safety additive is preferably selected from the group consisting of "luminescent substances, peptides, proteins, nucleic acids, preferably with 2 to 50 nucleotides, other low molecular weight inorganic or organic substances which are different from other components of the sealing liquid".

A luminescent substance contains atoms, molecules or particles which are capable of luminescence. The term luminescence refers to the emission of electromagnetic radiation, in particular in the IR, visible or UV range in the Course of a relaxation of an atomic or molecular electronic system from an excited state into a ground state. Here, the previous excitation by electrical energy or an electrical potential (electroluminescence), bombardment with electrons (Kathodolumi-neszenz), bombardment with photons (photoluminescence), heat (thermoluminescence) or friction (triboluminescence) take place. The luminescence comprises in particular the phosphorescence as well as the (photo) fluorescence. Fluorescence is a radiative deactivation of excited states, whereby the transition from the excited state to the ground state is spin-permissible. The residence time in the excited state is typically about 10 ^-8 s, ie the emission of fluorescence radiation ends immediately after the end of the energy input for excitation. In contrast, phosphorescence is a spin-forbidden deactivation of excited states via inter-combination processes. Therefore, the relaxation is weak and slow. The residence time in an excited state is a few milliseconds to hours and correspondingly long the emission of the phosphorescence radiation is observed. The emission wavelength of a luminescent substance is characteristic of the dye used and determined by the energy difference between the excited state and the ground state. The emission wavelength is the maximum of the emission intensity in an emission spectrum. Preferably, the luminescent substances are fluorescent dyes. For suitable fluorescent dyes, for example, the references only WO 03/052025 A . WO 02/053677 A . EP 0147252 A . GB 2,258,659 and FM Winnik et al., Xerox Disclosure Journal Vol. 3, 1992, pages 161-162 , referenced. Suitable fluorescent dyes on an organic basis, for example naphthalimides, coumarins, xanthenes, thioxanthenes, naphtholactams, azlactones, methines, oxazines, or thiazines, are also known from the literature, including only for example Schwander et al., "Fluorescent Dyes" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH Verlag GmbH & Co. KGaA, 2002 , is referenced. With regard to suitable fluorescence-conjugated polymers is supplementary to the literature McQuade et al., Chem. Rev. 100: 2537-2574 (2000) . Yang et al., J. Am. Chem. Soc. 120: 11864-11873 (1998) . Yang et al., J. Am. Chem. Soc. 120: 5321-5322 (1998) and Zhou et al., J. Am. Chem. Soc. 117: 12593-12602 (1995) directed. Fluorescent dyes can also be doped differently, for example with europium, whereby different emission wavelengths are then obtained. Only as examples of suitable luminescent substances are the substances of the Luminex product range of AlliedSignal called. When used in daylight, luminescent substances used in accordance with the invention have no easily recognizable color to the human eye. Alternatively, the luminescent substances, if they have a color, are so diluted that the color is not readily recognizable. The detection of a luminescent substance takes place by excitation with a suitable primary radiation and detection of the thereby excited emission radiation. A spatially resolved detection is possible for example by means of a CCD camera and a suitable upstream optics. A linear CCD element may be used in the case of a one-dimensional pattern, in which case the longitudinal extent of the gumming and the line of the sensor elements should optically run approximately parallel. However, it is also possible to use a two-dimensional CCD array with suitable optics for two-dimensional patterns, which then enables a direct imaging and representation of the detected pattern.

In principle, proteins or peptides of any species can be used, these preferably being non-toxic. The same applies to the nucleic acids. In the context of a sealing liquid should preferably only a single species, i. e. always the same molecules are used. The detection of a protein or peptide can be carried out, for example, by means of an antibody specific for the peptide or protein. If necessary, the protein or peptide is first immobilized and then incubated with the antibodies. By means of dyes coupled to such an antibody, a pattern can then be made directly visible to the human eye analogously to the staining of a tissue section in biochemistry. However, it is also possible to use antibodies to which luminescent substances are coupled, which are then made visible by irradiation, for example with UV light. In the case of nucleic acids also molecules of any species can be used. The detection is carried out, for example, by customary methods of hybridization of detector nucleic acids which are specific for the nucleic acids used in the sealing fluid, i. e. Hereby hybridize under stringent conditions, that are at least partially complementary in the sequence. The detector nucleic acids then either carry dyes which are readily recognizable, but it is also possible to use luminescent substances coupled to the detector nucleic acids and to detect them in the manner described. The relevant specialist literature of biochemistry, the various procedures for the spatially resolved detection of peptides, proteins or nucleic acids are removable, so that may be referred to.

Low molecular weight organic or inorganic substances have a molecular weight of typically below 5,000 Da, in particular below 1,000 Da. In particular, substances which by means of characteristic chemical reactions with an analysis substance are simple and come into consideration can be detected spatially resolved. Examples are salts of rather rare elements, such as Pd, Pt, Ir, Au or Ag.

The detection of the safety additive takes place in all variants with an at least one-dimensional spatial resolution.

A sealing liquid according to the invention may have the following components: a) from 50 to 99.9, preferably from 70 to 99.0, in particular from 80 to 99.0, by weight of water, b) from 0 to 10.0, preferably from 1.0 to 30.0, in particular 1.0 to 20,% by weight of penetrating agent, c) 0 to 10.0, preferably 0 to 3.0, in particular 0.01 to 1.0, wetting% wetting agent, d) 0 to 10.0, preferably 0 to 3.0, in particular 0.01 to 2.0,% by weight of stabilizer and / or buffer, e) 0 to 5.0, preferably 0 to 2.0, in particular 0.01 to 1.0,% by weight of dyes, f) 0 to 5.0, preferably 0 to 1.0, in particular 0.01 to 0.1,% by weight of flavoring agents, g) 0 to 10.0, preferably 0 to 1.0, in particular 0 to 0.1 wt .-% biocides and / or fungicides and / or other customary auxiliaries, h) 0.0001 to 10.0, preferably 0.0001 to 2.0, in particular 0, 0001 to 0.1,% by weight of the security additive, wherein the components a) to h) always add up to 100 wt .-%.

For the optionally present components b) to g), which are always different from the component h), the following is to be carried out.

A penetrating agent is a substance which leads to a shortened dissolution time of the sealing liquid in paper materials, which is shortened compared with water, in particular by at least 10%, preferably at least 20%, most preferably at least 50%, based on the travel time of pure water. Wetting agents and penetrating agents are different within the terminology used herein. The Wegschlagzeit is measured as the time in which a deposited on the paper material drop of the sealing liquid of a volume of 100 pl ± 5 pl has completely penetrated into the paper. The measurement of the Wegschlagzeit, also known as penetration time, is known from the inkjet printing technology and this is only for example in the literature EP 1072653 A2 directed. Suitable penetrants are, for example, C1-8 alkyl esters of C1-8 mono-, di- or tricarboxylic acids, it being possible for the carboxylic acid to be OH-substituted, in particular in the □ position. The carboxyl groups may be completely or partially esterified. Other preferred penetrants are C1-8 ethers of C1-8 polyols wherein at least one OH group of the polyol is not etherified. Suitable polyols are in particular diols or triols, in which case 1 or 2 OH groups can be etherified. C1-8 alkyl can be linear, branched, saturated or unsaturated. Examples of suitable C1-8 alkyl are methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert. Butyl, pentyl, etc. C1-8 carboxylic acids may be linear or branched, saturated or unsaturated. Suitable C1-8 carboxylic acids are formic acid, acetic acid, propionic acid, butyric acid, valeric acid, caproic acid, isobutyric acid, isovaleric acid, acrylic acid, crotonic acid, etc. Suitable hydroxycarboxylic acids are, for example, glycolic acid, lactic acid, mandelic acid, malic acid, tartaric acid and citric acid. Examples of suitable diols are 1,2-ethanediol, 1,3-propanediol, 1,2-propanediol, 1,4-butanediol, 1,3-butanediol, 1,2-butanediol, etc. The polyol can be one or more contain several ether groups. An example of such a polyol is 2,2'-oxydiethanol (diethylene glycol). Non-limiting suitable suitable compounds include: methyl lactate, ethyl lactate, propyl lactate, isopropyl lactate, malic acid esters, malic monoesters, tartaric esters, tartaric acid monoesters, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monopropyl ether, diethylene glycol monobutyl ether. With regard to further suitable penetrating agents, reference will be made, by way of example only, to the literature EP 1072653 A and the references cited therein, as well as the references DE 69628897 T2 . US 5,674,314 A directed.

Surfactants which are suitable, for example, are surfactant wetting agents. The wetting agent may be selected from the group consisting of "nonionic surfactants, amphoteric surfactants, anionic surfactants, cationic surfactants, ricinoleamide propyl betaines". Preferably, they are biodegradable surfactants. Amphoteric surfactants are preferably used, since surprisingly a particularly good wetting of the gumming succeeds.

Furthermore, a sealing liquid may contain one or more of the following additives and / or auxiliaries: stabilizers and / or buffers, dyes, and / or flavorings. Of course, biocides (for example, Parmetol A6 or cetyltrimethylammonium bromide) and / or fungicides may be added in a conventional manner. As dyes and flavorings are preferably substances with approval as food additives in question, such as food colors, citral, Hexylhexonat etc .. Stabilizer and / or buffer stabilize components of the sealing liquid, which can be hydrolyzed. For example, Na lactate is a suitable stabilizer or buffer for lactate esters. Suitable stabilizers or buffers are in particular all customary setting salts, such as Na lactate, NaCl, KCl, etc., in question.

Important for the understanding of the invention is that the security additive is not an otherwise common component of a sealing liquid, but is used solely for detection purposes. A safety additive does not fulfill any further function in the context of a mailpiece casing moistened with it. In particular, a security additive is not functional according to one of the components b) to g) or as a component of a multicomponent adhesive.

The kit according to the invention allows the use of the above-described closure liquid for closing mail pieces or a method for producing a sealed mailpiece, wherein a provided with a rubber tab of a mail piece envelope enveloping the mail piece or an area of the mail piece opposite the folded flap with the closing liquid with defined laterally inhomogeneous distribution of the security additive is moistened, and wherein the tab is then folded and pressed against an opposite surface of the mailpiece shell. The term "laterally inhomogeneous distribution" here refers to an uneven distribution of the sealing fluid or of the safety additive, based on the plane of the rubber coating or the opposite region of the mail piece envelope. In other words, the sealing liquid or the security additive is applied with a pattern. The inhomogeneity will in the simplest case be such that the closing liquid is applied in some areas, but not applied in other areas. However, it is also possible in principle for different amounts or concentrations of safety additive to be applied in accordance with the prescribed pattern.

In particular, the mail piece may be a letter and the mail piece envelope an envelope. The moistening and folding and pressing the tab is preferably controlled automatically in a letter-closing device.

The invention further relates to a letter-closing device with a tank containing a closing fluid according to the invention and a humidifier rocker, which for the removal of sealing liquid from the tank and transfer removed sealing liquid on the rubber coating or rubber coating with folded flap opposite portion of an inserted into the letter-closing device mail piece with defined laterally inhomogeneous distribution of the closing liquid or the safety additive is set up.

The kit according to the invention may be part of a semi or fully automatic device which closes a mail piece. In such an automated device, the closing of a mail item using a sealing liquid described above, which applied by means of a likewise described above means for applying the sealing liquid on the mail piece to be closed and close this. In a second device (which may also be configured as a further component of a common device), an automated detection of the local distribution of the safety additive in a mailpiece can also be carried out. In this case, an alarm can also be automatically generated when a mail piece is identified which, after evaluation of the lateral distribution of the security additive, is noticed as being opened.

However, the kit according to the invention can also be prepared for purely manual application. In this case, a roller, a roll, a stamp or a sponge can be moistened manually with a sealing liquid, which is then manually applied to the mailpiece. The detection can also be done manually, for example by using a luminescent dye in combination with a UV lamp.

The kit according to the invention thus makes possible a method for detecting an unauthorized opening of a mail piece closed by means of a method according to the invention, wherein the laterally inhomogeneous distribution of the security additive is detected and / or displayed and optionally automatically compared with a laterally inhomogeneous reference distribution. With regard to the detection, reference is made to the above statements in connection with various safety additives.

In the following the invention will be explained in more detail by means of examples only.

Example 1: Closing fluid

For example, the following commercially available products can be used as sealing fluids: Closing fluid "FT" from FrancoTech GmbH, Germany, "EZ Seal" from Pitney Bowes, USA, and "Quick Seal" preparation from Service Industries, USA, in which US Pat Canada expelled form.

Furthermore, closing liquids can be used which contain aqueous solutions with a penetrating agent and auxiliaries. Suitable penetration agents are: EGDA (ethylene glycol diacetate), DEGMEE (diethylene glycol monoethyl ether), EL (ethyl lactate) and EGMBE (ethylene glycol mono-butyl ether, all of which are available from Merck, Germany can be used: NaLac (sodium lactate solution 50%, Merck, Germany), TMN 6 (Tergitol TMN 6 nonionic surfactant, Fluka, Germany), AM R 40 (ricinoleamidepropyl betaine, amphoteric surfactant pattern, Degussa, Germany) and acid chemoamine BC 01 as a dye ( Duasyn Merck).

A conventional sealing liquid is admixed with a customary commercially available fluorescent substance which, in the visible, in any case at the concentration used, has no color detectable by the human eye but which glows red when irradiated with a UV lamp. The admixture takes place with about 0.01 wt .-%.

Example 2 Application of a Closing Liquid According to Example 1

The gumming of an envelope is wetted by means of a roll of sealing liquid according to Example 1. In this case, the roller has a plurality of wave-shaped recesses with a width of 2 mm. By simply rolling over the rubberized surface of the envelope by hand, you can create wavy areas of the gumming that are not wetted. Then the flap is folded over and pressed against the envelope.

Example 3: Testing of a mailpiece closed in accordance with Example 2 and not unauthorized.

The envelope is first slit along an edge by means of a letter opener. Then the inside of the envelope is irradiated with a UV lamp. In the area of the envelope on which the flap with the gumming has been turned over (and still sticks), one recognizes under the UV irradiation a red glowing surface, which is interrupted by wavy lines. This can be seen on the inside, because the closing liquid is taken up ("knocked off") by the envelope when closing. In this case, only a very slight blurring of the pattern occurs in the plane of the topping. The analysis shows that the envelope was not opened. This can also be automated by registering the pattern, for example by means of a CCD camera, and comparing it with a desired pattern. If the comparison is positive, an indication "O. K "or the like done. Negative comparison will result in a warning signal, visual and / or audible.

Example 4: Testing of a sealed according to Example 2 and unauthorized opened mail piece.

An envelope is first closed according to Example 3. Then the envelope is exposed in the gum area of a steam atmosphere until the tab can be opened non-destructively. Thereafter, the tab, if necessary, after re-moistening, closed again. Then the envelope is opened and inspected according to Example 3. It shows a nearly uniform distribution of the red glowing security additive and the mailpiece can be qualified as open unauthorized.

This result is based on the fact that the opening in steam atmosphere leads to a strong blurring of the safety additive and that a precise reclosure with exactly the same positioning of the flap is very difficult. As a result, the pattern is irreversibly destroyed by opening and reclosing. However, the unauthorized person did not notice because the safety additive is not visible in visible light.

List of Figures

1 shows an example of an envelope with rubberizing the flap

2 shows a roller with wave-shaped recesses to produce a wave-like pattern on the envelope.

3 shows the pattern made visible by UV irradiation (by way of example). The detail enlargement (detail a) shows the wave-shaped course of the generated pattern, which is in focus.

4 shows the pattern visualized by UV irradiation, which shows up after an unauthorized opening. In this example, the unauthorized opening does not lead to a blurring of the security additive. However, when the letter is closed again, it is impossible to reposition the wavy lines precisely. The result is a kind of interference pattern, which arises because the generated wave pattern on the envelope flap no longer matches the wave pattern on the envelope body. Such a pattern occupies the unauthorized letter opening.

5 shows various types of rollers for the application of the closing liquid

6 shows a stamp for applying the sealing liquid. The stamp contains the surface of a sponge. The application of the closing fluid by means of such a sponge produces an irregular pattern. Nevertheless, the unauthorized letter opening can also by means of such a pattern can be recognized quickly and clearly.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 202004011390 U1 [0002]
• DE 4436294 A1 [0006]
• DE 3431239 A1 [0007]
• DE 8716046 U [0007]
• DE 2319866 A [0008]
• EP 07090104 [0009]
• WO 03/052025 A [0018]
• WO 02/053677 A [0018]
• EP 0147252 A [0018]
• GB 2258659 [0018]
• EP 1072653 A2 [0024]
• EP 1072653A [0024]
• DE 69628897 T2 [0024]
• US 5674314 A [0024]

Cited non-patent literature

• FM Winnik et al., Xerox Disclosure Journal Vol. 3, 1992, pages 161-162 [0018]
• Schwander et al., "Fluorescent Dyes" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH Verlag GmbH & Co. KGaA, 2002 [0018]
• McQuade et al., Chem. Rev. 100: 2537-2574 (2000) [0018]
• Yang et al., J. Am. Chem. Soc. 120: 11864-11873 (1998) [0018]
• Yang et al., J. Am. Chem. Soc. 120: 5321-5322 (1998) [0018]
• Zhou et al., J. Am. Chem. Soc. 117: 12593-12602 (1995) [0018]

Claims (6)

Kit for detecting unauthorized opening of a mailpiece containing At least one closing fluid for closing mail items containing water and a safety additive not visible by direct visual inspection, At least one means for applying the sealing liquid to a mailpiece, wherein the means is designed such that a defined laterally inhomogeneous distribution of the sealing liquid is achieved, • at least one means of visualizing the safety additive. Kit according to claim 1, wherein the security additive is selected from the group consisting of "luminescent substances, peptides, proteins, nucleic acids, preferably with 2 to 50 nucleotides, other low molecular weight inorganic or organic substances other than other components of the sealing liquid". Kit according to one of claims 1 or 2, wherein the sealing liquid has the following composition: a) from 50 to 99.9, preferably from 70 to 99.0, in particular from 80 to 99.0,% by weight of water, b) 0 to 10.0, preferably 1.0 to 30.0, in particular 1.0 to 20,% by weight of penetrating agent, c) 0 to 10.0, preferably 0 to 3.0, in particular 0.01 to 1.0,% wetting agent, d) 0 to 10.0, preferably 0 to 3.0, in particular 0.01 to 2.0,% by weight of stabilizer and / or buffer, e) 0 to 5.0, preferably 0 to 2.0, in particular 0.01 to 1.0,% by weight of dyes, f) 0 to 5.0, preferably 0 to 1.0, in particular 0.01 to 0.1,% by weight of flavoring agents, g) 0 to 10.0, preferably 0 to 1.0, in particular 0 to 0.1 wt .-% biocides and / or fungicides and / or other customary auxiliaries, h) 0.0001 to 10.0, preferably 0.0001 to 2.0, in particular 0.0001 to 0.1,% by weight of the safety additive, wherein the components a) to h) always add up to 100 wt .-%. Kit according to one of claims 1-3 wherein the means for applying the sealing liquid is selected from the group "roll, roller, stamp, sponge". Kit according to claim 4, wherein the means for applying the closing fluid is applied manually. Kit according to one of claims 1-5, wherein the means for visualizing the security additive is selected from the group "UV lamp, CCD camera".

Images