EP1296306A2 - Use of a security adhesive band to show the unauthorized opening of a shipping package - Google Patents

Abstract

Multilayer safety adhesive tape comprises carrier based on stretched thermoplastic film, with upper and lower surface, where under surface comprises: (a) primer layer not covering the whole of the surface; (b) separating layer covering the whole surface of the primer layer and the whole surface of the free thermoplastic film; and (c) contact adhesive composition covering the whole surface of the separating layer. Multilayer adhesive tape comprises a carrier based on a stretched thermoplastic film, with an upper and lower surface, where the under surface comprises: (a) a primer layer not covering the whole of the surface, which is strongly anchored to the thermoplastic film; (b) a separating layer covering the whole surface of the primer layer and the whole surface of the free thermoplastic film, where the separating layer is more strongly anchored to the primer layer than to the thermoplastic film; and (c) a contact adhesive composition covering the whole surface of the separating layer, which is more strongly anchored to the separating layer than to the thermoplastic film.

Description

The invention relates to the use of a multi-layer adhesive tape Basis of a stretched thermoplastic film, which is coated on one side with adhesive, for Reseal the shipping packaging with the aim of being an unauthorized Display attempt to open.

Preferred shipping packaging is used in the use according to the invention of shipping bags, envelopes, envelopes, pouches and the like, hereinafter referred to only as examples of shipping envelopes, without wishing to restrict their use to them.
By using the adhesive tape, the attempt to open the shipping envelope is indicated, in that areas of the adhesive tape remain on it as a message when the adhesive is peeled off, the message not being recognizable before being removed from the surface. The message remains recognizable, even if the adhesive tape is put back exactly on the original gluing point after being loosened.

The protection of goods in the logistical chain from producer to user has become more difficult due to the large number of links in the chain. That's the way it is Damage caused by theft of the goods from their shipping packaging during storage or transportation, has become a significant cost factor. The Recipient of a shipping unit in which part of the goods are removed or stolen has been exchanged, it also has argumentative difficulties to prove that this Manipulation was not made in its sphere of influence.

A chain link is formed by transport companies or courier services that the Take over transport to the recipient. Delivering shipments of goods high Tangible assets with small size or documents are usually made in shipping envelopes are often closed by normal adhesive systems in the opening area. This Adhesive systems can often be opened with simple tools such as knife blades without the attempted manipulation is obvious.

A significantly higher security against theft attempt and a safer one Evidence that a shipping unit before transfer to the next section of the logistic Chain has been opened, allows an adhesive tape that has an irreversible message indicates that it has already been detached from the surface of the shipping unit.

Security systems for detecting unauthorized opening are known and a large number are described in the prior art. Security labels are particularly important here. For example, US Pat. No. 4,184,701 describes security labels which are made up of several layers of color or generally layers and therefore have little adhesion of the product layers to one another. In combination with a strongly adhesive adhesive, such layers separate irreversibly from each other, which indicates the opening of the packaging.
Furthermore, for example, DE 34 31 239 A1 describes the use of security labels consisting of a carrier material with low tear resistance. In combination with a strong adhesive, the security label is irreversibly destroyed when removed and the attempt to open it is displayed.
The security label has a lower first adhesive layer to be removed from a carrier and applied to the packaging on the underside of a first label material, on the upper side of which a second label material is applied via a second adhesive layer. The strength of the adhesive strength of the first adhesive layer between the packaging and the first label material is different from the strength of the adhesive force of the second adhesive layer between the first label material and the second label material.

Safety adhesive tapes are usually designed so that in the area of the lettering introduced an anchoring weakness below the colored structure of the adhesive tape becomes. For example, US Pat. No. 5,633,058 discloses a transparent material that is weakly anchored on the carrier film Letter print described, with a full-surface colored, well on the carrier film and the first pressure anchoring layer is covered. The colored layer is with one Self-adhesive covered. If such a security tape is used by one Peeled off the surface, the transparent letter print dissolves together with the Color layer and the adhesive from the film surface and remains as lettering back of the surface.

EP 0 491 099 A1 describes a letter print consisting of a silicone material which is also covered with a colored layer which adheres well to the film. The colored layer is covered with a self-adhesive. If such a security adhesive tape is peeled off from a surface, the colored layer and the adhesive mass detach from the silicone surface and remain on the surface as lettering.
The disadvantage of such a construction is the complex process technology used to create the layers, since partial silicone surfaces make further coating very difficult due to the low surface tension.

In US 4,121,003 it is described that the transfer of a lettering thereby achieved is that this lettering consists of a less cohesive material that when peeling of the security adhesive tape splits into itself and partly on the adhesive surface remains.

EP 0 404 402 A2 is based on a transparent, cleavable layer that forms on the The interface becomes opaque and thus a previously unrecognizable lettering provides an optical contrast surface in front of which the lettering can then be read.

Tamper-proof sealing of shipping envelopes are essential for the application also known various problem solutions.

No. 4,838,708, for example, proposes a security bag that is equipped with an adhesive system at its opening. The adhesive system is designed in such a way that a lettering is created by two different connection strengths on the bag material of two adhesives. Furthermore, versions on the same basis are also presented there, which also provide an adhesive strip for closing the bag.
A security system for bags, which, among other things, produces a visual indication when the temperature falls below a certain level, is described in US Pat. No. 5,631,068. In this case, the adhesive tape consists of a flexible film made of polyethylene coated with adhesive and a color layer in the form of a printed image. A suitable combination of carrier and adhesive with regard to different coefficients of thermal expansion or shrinkage delaminates the color layer when it cools or heats above / below a certain temperature.

Another embodiment of a guarantee closure for a mailing bag is in EP 0 460 459. The closure flap of the mailing bag comes with a vaporized metal layer a few micrometers thick, with an adhesive coated and provided with a protective cover that can be removed before use. at an attempt to open the metal layer undergoes irreversible damage and shows thus the attempt at manipulation. Another embodiment mentioned here is in same layer structure of metal layer and adhesive on a polyester film as Duct tape.

GB 2 138 396 specifies a solvent-resistant safety closure for bags. Here the bag is closed by an adhesive strip, the adhesive of which in the case of Contact with a solvent undergoes a color change. For this is located in the Adhesive of the adhesive strip a dye formulation which is soluble in solvents, which attack the glue.

An important requirement for security against manipulation is that it is quick and easy visible individuality of the adhesive tape closure. Normal packaging tapes are therefore printed with the individual company logo on the back of the carrier, so that an exchange or pasting with another adhesive tape can be easily recognized can. The possible print run of such labeled tapes is at a minimum a single role, so that a high degree of individuality of delivery of the packaging with this tape can be closed, can be achieved.

A combination of the two security effects - "transmit message" and "individual Printing "- has so far not been satisfactorily successful. The subsequent one Printing on the back of the backing of the previous adhesive tapes is necessary Silicon releases on this surface are not possible with the usual printing processes possible. In the previous versions of such an adhesive tape, the Carrier film before equipping with the necessary for the effect "transmission of a message" Printed layers. The consequence of this is that there are only large runs of adhesive tapes can be produced economically with an individual print.

Available versions of a security adhesive tape in the sense described alternatively printed with a consecutive number to allow individualization to reach. However, this method requires a lot of information exchange within the logistic chain. In addition, everyone is laboriously checking Shipping unit according to the number range announced by the producer required.

The technical design of such a security tape is very expensive in Material and in the manufacturing process. So far, carrier films have been used which are made of expensive Materials such as polyester and polystyrene are made. However, films based on polystyrene are brittle and do not withstand the shock and drop loads that occur during transport and during Storage of packaging sealed with packaging adhesive tapes may occur.

Thermoplastic films based on polyethylene terephthalate (PET) or polyvinyl chloride (PVC) are used for the production of adhesive tapes by various manufacturers. Films based on PET are characterized by their high elongation at break and heat resistance from 130 ° C to 175 ° C and resistance to dilute alkalis and acids.
Furthermore, films based on polyesters have a very high abrasion resistance and dielectric strength, but are less widespread in the field of packaging adhesive tapes due to the relatively high price compared to films based on polyolefins.

Films based on PVC in combination with solvent-based adhesives based on natural rubber are offered by various manufacturers as packaging tapes. Due to the better heat resistance, films made of hard PVC are used, which are up to max. 105 ° C have good heat resistance.
The PVC can be obtained by emulsion, suspension or bulk polymerization. Copolymers based on PVC / vinyl acetate are also known.

Furthermore, the films based on hard PVC are characterized by medium penetration and partial resistance to gasoline, oil and alcohol. in the general is the anchoring of primers on PVC films without corona treatment better than other thermoplastic films, such as films based on polyolefins. This is due to the high surface energy even without pretreatment [approx. 39 dyn / cm] and on the rough surface structure of PVC foils. For a sufficient Anchoring adhesives based on natural rubber is one with primer coated PVC film recommended.

In the production of adhesive tapes with adhesive compositions based on natural rubber are both water-based and solvent-based primers as adhesion promoters inserted between adhesive and carrier film. These have used adhesion promoters partly an adhesive based on natural rubber applied to the solution cross-linking effect.

The object of the present invention is to use a security adhesive tape specify that when removing from the surface of a package, especially one Envelope or the like, leaves a layer of color in particular, within which there is an inverse lettering. At the same time is the identical lettering positively visible on the peeled backing.

This problem is solved by using an adhesive tape, as it is in the Main claim is set out. Subject of the subclaims are advantageous Developments of the subject matter of the invention. The invention further relates to others Proposed uses of the adhesive tape according to the invention.

• eine nicht vollflächig aufgetragene Primerschicht, wobei die Primerschicht sehr gut auf der Thermoplastfolie verankert,
• eine vollflächig über die aufgetragene Primerschicht und die freie Thermoplastfolienoberfläche aufgetragene Trennschicht, wobei die Trennschicht besser auf der Primerschicht verankert als auf der Thermoplastfolie,
• eine vollflächig auf die Trennschicht aufgetragene Haftklebemasse, die auf der Trennschicht besser verankert ist als die Trennschicht auf der Thermoplastfolie,

zum Verschließen von Versandbeuteln-, -taschen, -kuverts, -umschlägen und dergleichen. Die Bezeichnung Klebeband soll hier keine besonderen Beschränkungen bezüglich der Ausdehnungen in der Fläche beinhalten, so daß auch Klebefolien und dergleichen dem Erfindungsgegenstand entsprechen.Accordingly, the invention relates to the use of a multi-layer adhesive tape with a carrier based on an oriented thermoplastic film, an upper surface and a lower surface, on the lower surface of which the following layers are applied:

• a primer layer not applied over the entire surface, the primer layer being very well anchored on the thermoplastic film,
• a separating layer applied all over the applied primer layer and the free thermoplastic film surface, the separating layer being better anchored on the primer layer than on the thermoplastic film,
• a pressure-sensitive adhesive applied over the entire surface of the release layer, which is better anchored on the release layer than the release layer on the thermoplastic film,

for sealing shipping bags, bags, envelopes, envelopes and the like. The term adhesive tape is not intended to contain any particular restrictions with regard to the extent in the area, so that adhesive films and the like also correspond to the subject matter of the invention.

The use of such an adhesive tape serves, for example, to unauthorized attempt to open.

When using the adhesive tape according to the invention on the surface of a packaging, in particular a shipping envelope or the like, this leaves an inverse lettering on the packaging when the separation, in that the colored first separating layer separates from the thermoplastic film, while areas which are primed on the carrier surface are well anchored with which the carrier is detached from the surface of the packaging.
The area of the first separating layer which has been strongly anchored against the film surface with the primer layer remains on the carrier surface.

A suitable gradation of the separating forces of the multilayer structure means that achieved safe separation within the adhesive tape and splitting the packaging surface especially for cardboard boxes, shipping envelopes Soda paper or paper envelopes avoided by the adhesive. The lettering is especially for all commercially available paper qualities or materials for Shipping envelopes or the like, which are made of, for example, printed polyethylene can exist, securely transferable.

The message cannot be seen before the tape is removed from the surface. After peeling off, the message remains recognizable, even if the tape is exact again is placed at the original bond point, so that the proof of a Manipulations of a quantitative or qualitative nature on the packaged product remain recognizable.

a) festen schwer spaltbaren Oberflächen,

b) auf wenig spaltfesten Oberflächen und

c) auf Oberflächen mit antiadhäsiven Eigenschaften übertragen wird, wie sie bei handelsüblichen Papierqualitäten aus Altpapier üblich sind.

The use of the security tape ensures that the message stays safe

a) solid surfaces which are difficult to split,

b) on slightly non-cracking surfaces and

c) is transferred to surfaces with anti-adhesive properties, such as are customary for commercially available paper qualities made from waste paper.

Furthermore, the inventive concept encompasses the use of security adhesive tapes, such as they are set out in the claims for which an economical individual printing for at least one role is possible.

An adhesive tape is advantageously used, in which the thermoplastic film is stretched out Polyolefins or polyester and is particularly transparent.

The thermoplastic film preferably consists of stretched HDPE, PVC, PET, monoaxial stretched polypropylene or biaxially stretched polypropylene.

Polyester-based films, for example polyethylene terephthalate, can also be used to produce the adhesive tapes of the invention.
The thicknesses of the films based on PET are between 20 and 100 µm, in particular between 30 and 50 µm.

Films based on stretched polyolefins belong to the prior art. Monoaxial and Biaxially stretched films based on polyolefins are used in large quantities for Packaging tapes, strapping tapes and other tapes are used. Even foils based on stretched polyethylene or stretched copolymers containing ethylene and / or polypropylene units are known. All these listed foils can be viewed as Use the carrier film according to the invention.

Monoaxially stretched polypropylene is characterized by its very high tensile strength and low elongation in the longitudinal direction and is used, for example, for the production of Strapping tapes used. Preferred for the production of the adhesive tapes according to the invention for bundling and palletizing cardboard boxes and other goods are stretched monoaxially Films based on polypropylene.

The thicknesses of the monoaxially stretched films based on polypropylene are preferably between 25 and 200 μm, in particular between 40 and 130 μm.
Films made of monoaxially stretched polypropylene are particularly suitable for producing the adhesive tapes according to the invention. Monoaxially stretched films are predominantly single-layered, but in principle multilayered monoaxially stretched films can also be produced. One-, two- and three-layer foils are predominantly known, and the number of layers can also be chosen to be larger.

Preferred in the use according to the invention for securely closing shipping envelopes and the like are adhesive tapes made of biaxially stretched films based on polypropylene with a stretch ratio in the longitudinal direction between 1: 4 and 1: 9, preferably between 1: 4.8 and 1: 6 and a stretch ratio in the transverse direction between 1: 4 and 1: 9, preferably between 1: 4.8 and 1: 8.5.
The elasticity modules achieved in the longitudinal direction, measured at 10% elongation according to ASTM D882, are usually between 1000 and 4000 N / mm ² , preferably between 1500 and 3000 N / mm ² .
The thicknesses of the biaxially stretched films based on polypropylene are in particular between 15 and 100 μm, preferably between 20 and 50 μm.
Biaxially stretched films based on polypropylene can be produced using blown film extrusion or using conventional flat film lines. Biaxially stretched films are produced in one or more layers. In the case of the multilayer films, the thickness and composition of the different layers can also be the same here, but different thicknesses and compositions are also known.

Adhesive tapes are particularly preferred for the use according to the invention single-layer, biaxially or monoaxially stretched films and multilayer, biaxial or monoaxial films based on polypropylene, which have a sufficiently strong bond between the layers, since delamination of the layers during the Application is disadvantageous.

Hard PVC-based films are also known and are used by various Adhesive tape manufacturers used for the production of packaging tapes. Soft PVC films are also suitable for the production of packaging tapes, whereby their inadequate heat resistance of max. 60 ° C must be taken into account.

For the use of adhesive tapes according to the invention for a secure closure of a shipping envelope or the like are preferably adhesive tapes made of foils used on the basis of hard PVC. The thicknesses of the foils are preferably between 30 and 100 µm, especially between 35 and 50 µm. The use according to the invention provides the closure of shipping bags, bags, envelopes, envelopes or the like.

Adhesive tapes are advantageously used, in which the upper surface of the Thermoplastic film is coated with a release coating. Release coatings as they are on the upper, i.e. on the film surface opposite the adhesive optionally coated are widely used in the adhesive tape industry used. An overview of release coating systems based on silicone and their use in the area of pressure sensitive adhesives can be found in "Silicone Release Coating" (D. Jones, Y. A. Peters in Handbook of Pressure Sensitive Adhesive Technology, Third Edition, edited by Donatas Satas, Van Reinhold New York. Pp. 652-683).

The use of rear side release lacquers ensures that the adhesive tapes roll off easily and evenly. Release coatings based on solvent-based carbamate systems and based on silicone-based systems are primarily used.
Release coatings based on silicone systems are suitable as release coatings for the adhesive tapes according to the invention. UV-curing silicone systems based on 100% are preferred as the release coating, but solvent-containing silicone systems can also be used as the release coating for the adhesive tapes according to the invention.
The application amount of the release coating on the carrier material is preferably 0.1 to 3 g / m2. In a further particularly preferred embodiment, the layer application of the release coating is adjusted from 0.2 to 1.5 g / m 2.

In order to anchor the first separating layer very well during the inventive process Using the tape to achieve certain areas on the film is called first layer an adhesion promoter or primer is used. This is that of the release coating opposite film surface (lower surface) used.

Adhesion promoters based on solvents and water are used as adhesion promoters between Film and adhesive or other layers used for the production of adhesive tapes. Layers with high affinity for supports or adhesion to supports Thermoplastic films are used to manufacture adhesive tapes. The height Affinity for the surfaces of substrates based on thermoplastic films cause the Properties of such components for use as suitable adhesion promoters. Various primer systems are known. For use as an adhesion promoter for the first The release layer of the adhesive tapes according to the invention are, for example, aqueous adhesion promoters based on polyurethanes, low chlorinated polypropylenes, styrene-butadiene copolymers and acrylates can be used. Solvent-based adhesion promoters are also used for anchoring subsequent layers in the adhesive tapes of the invention. This Adhesion promoters are used as primers in the adhesive tape industry.

The application amount of the primer layer on the carrier material is preferably 0.5 to 12 g / sqm. In a further preferred embodiment, the layer application is the first adhesion promoter Layer set from 1.5 to 6 g / sqm.

In a preferred embodiment of the adhesive tape used according to the invention the adhesion of the primer layer to the thermoplastic film based on polyolefins Corona treatment or especially improved by flame pretreatment, because Especially the surfaces of the films based on stretched polyolefins can be removed by them generally known methods, such as corona or flame treatment, are treated become. Surface treatments by flame pretreatment are preferred. A The article provides an overview of the surface treatment processes, for example "Surface pretreatment of plastics for adhesive bonding" (A. Kruse; G. Krüger, A. Baalmann and O. D. Hennemann; J. Adhesion Sci. Technol., Vol 9, No12, pp 1611-1621 (1995)).

The primer layer is not applied over the entire surface to that opposite the release coating Surface of the carrier applied on the basis of thermoplastic films. To a visual To achieve a safety effect when using the adhesive tapes according to the invention, the primer layer is applied to the film surface in a specific, non-full-surface manner applied. The application of the primer layer is designed in such a way that only special ones Areas of the film surface are coated, for example the words Form "OPENED" or "VOID". This type of application of the primer layer is carried out by suitable printing processes.

The primer layer on the film surface that is not applied over the entire surface is preferred characteristic signs or symbols, in particular in the form of Letters or words.

For the production of the adhesive tapes used according to the invention, a full surface area is used Separating layer on the primer layer or on the free surface areas of the applied film applied. As a separating layer for the adhesive tapes according to the invention are suitable, for example, resin dispersions, acrylate dispersions or in general Polymer dispersions or solvent-containing polymer solutions, one after the Drying has sufficient low adhesion to the carrier and is brittle.

Particularly preferred as a separating layer for the adhesive tapes used according to the invention are suitable printing inks for substrates based on thermoplastic films. Here are the Example water-based, solvent-based or UV-curing Flexographic inks used as a layer. Such layers of color are strong in color and suitable by means of different technologies on the first layer or the Foil to be applied. With a suitable choice of printing inks, this can be done Interface layer system of the adhesive tapes used according to the invention set in this way be that the separating layer is very well anchored on the primer layer, on the other hand, with the areas of the film not coated with the primer layer, poor adhesion or has a bad bond.

The application amount of the separating layer on the carrier material or Primer layer is preferably 2 to 18 g / qm. In a further preferred embodiment the layer application of the first layer is set from 5 to 11 g / m2.

Essentially all known adhesives with high adhesive strength can be used as adhesives be used on the adhesive base to be packaged.

The adhesive of the adhesive tape used according to the invention can consist of a Adhesive based on solvent-based natural rubber and acrylate adhesives consist. Adhesives based on acrylate dispersions are preferred, in particular of aqueous acrylic dispersions. These adhesive technologies are used in the Adhesive tape industry used.

The amount of adhesive applied to the backing material is preferably 15 to 60 g / sqm. In a further preferred embodiment, the layer application is from 20 to 30 g / m2 set.

The adhesive tapes used according to the invention are produced in one multi-stage process. In a first step, one of the surfaces is coated of the carrier (upper surface) based on a thermoplastic film with that on silicone based release coating. This one-sided equipment of the carrier is with corresponding coating systems realized.

The film surface opposite the release coating (lower surface) becomes optionally pretreated with corona or flame.

The primer layer with high affinity for the surface of the thermoplastic film used with the help of flexographic printing on the film surface opposite the release coating (lower surface) applied.

Printing using flexographic printing is used, among other things, in the adhesive tape industry for individualizing adhesive tapes.
Printing forms are used here, the raised portions of which transfer the first layer. The printing forms are flexible plates made of rubber or photopolymers. Flexographic printing components are thin, both solvent and water based. They dry quickly, especially in the area of radiation-curing systems. Aqueous flexographic printing components are preferably used in the production of the adhesive tapes according to the invention. The selection of the anilox roller depends on the printing material used and the associated flexographic printing component.

The application of the separating layer to the primer layer or to the open one It is placed on the film surface in the production of the adhesive tapes according to the invention achieved by using common methods. The coating more watery Systems using a squeegee or solvent-based systems using a coating bar Anilox rollers or printing processes should be mentioned in this context.

Both the coating bars and the doctor blade technology are suitable for the subsequent coating of the adhesive on the separating layer.
It is also possible to apply adhesive based on styrene-isoprene-styrene as a hotmelt pressure-sensitive adhesive to the separating layer by means of known technology in the production of the adhesive tapes used according to the invention.

An advantageous variant of the use according to the invention provides that the Adhesive tape is individualized, preferably by printing with standard colors, especially on the adhesive side.

For the use according to the invention of tamper-evident closing of Envelopes, bags, pouches, envelopes and the like can do that Adhesive tape used according to the invention has a covering on the open adhesive Wear an appropriate release liner to prevent premature or unintentional to avoid automatic closing of the shipping envelope and that Envelopes can only be closed if they are intended to be sent.

The inventive idea for the use of an adhesive tape for sealing Envelopes and the like in particular provide, on the one hand, an adhesive tape indicate which one has a release liner on the side coated with adhesive, on the other hand, the adhesive side of the adhesive tape applied to the shipping envelope to be equipped with a release liner.

Covering the web-shaped adhesive tape with a suitable release liner can for example after coating and drying the adhesive in one Laminating done. In a variant of the use of the Adhesive tape, the adhesive tape has a covering applied in the manufacturing process a release liner on the side covered with adhesive.

Another variant of the use according to the invention provides that the adhesive tape is used suitable applicators during the packaging process of an envelope material to apply to a shipping envelope by in one embodiment of the Adhesive tape used according to the invention one half of the adhesive tape on the The closure flap adheres, the other one, covered on the adhesive side with release liner Half protrudes over the edge of the closure flap and for closing the bag is available.

The inventive concept further includes that for the envelope seal Adhesive tape is used, which has the entire surface on the side carrying the adhesive a release liner is covered. With a suitable application technology or Adhesive tape guidance during the packaging of the envelope material into one Envelope enables the release liner to be removed from the adhesive tape in the application step lifted off and after the partial sticking of the adhesive tape on the closure flap is applied again in the longitudinal direction on the protruding adhesive tape. It is possible to release the liner in its original position on the envelope to apply the applied adhesive tape so that the release liner only protrudes Cover the area of the adhesive side and with the other the back of the Closing flap overlaps. Another possibility is to use the adhesive tape offset application on the tape already applied to the envelope, so that the release liner on the one hand covers the open adhesive side of the adhesive tape, on the other hand, over the edge of the adhesive tape projecting beyond the closure flap protrudes. Both cases of the protruding release liner offer the advantage of a touching aid for to provide the manual removal of the release liner by the shipper.

There is also an embodiment of the one used according to the invention Adhesive tape for the variant of the release liner applied offset to the adhesive tape in that the release liner both over the back of the flap and on the edge of the adhesive tape protruding over the flap.

Another variant of the use according to the invention consists of an adhesive tape Full coverage of the side provided with adhesive by a lengthwise direction slotted release liner. During the cutting process of the web material In this case, the release liner becomes a tape roll by another cutter or Punching machine slotted.

When applying the adhesive tape with a slotted release liner, half of the Release liners directly before application to the closure flap via suitable Removal devices lifted off the tape and removed. With precise edges Applying can be made in this way a security lock that does not protruding release liner and has visual advantages.

There is a further variant of the use of an adhesive tape according to the invention in that a release liner only partially covers the side coated with adhesive Longitudinal direction, e.g. half-sided, covered, this embodiment of the adhesive tape is created by removing, for example, half of the slotted release liner immediately after the slitting process. Advantages arise here due to the simplified process control for the manufacturers of shipping envelopes.

In a further variant of the use according to the invention, an adhesive tape without Release liner is used, the packaging process of the envelope provides for Apply release liner separately to the flap of the envelope.

The release liner can be designed in such a way that it consists of a paper or film-based carrier. Release liners with a more complicated structure based on a carrier made, for example, of paper coated with polyethylene can also be used. The suitable release liner has a release coating which is applied to at least one side of the carrier which faces the adhesive to be covered of the adhesive tape used according to the invention. Suitable release liners are made of silicone systems. UV-curing silicone systems based on 100% are preferred as a release coating, but solvent-based silicone systems can also be used to cover the adhesive tapes. Basis weights of release coatings for release liners range from 0.1 to 4 g / m ² depending on the substrate. For example, for film carriers with 0.1 to 0.5 g / m ² a lower application weight is required than for release papers with approximately 0.7 up to 3.5 g / m ² .

Figur 1

eine Schnittzeichnung eines für die erfindungsgemäße Verwendung eingesetzten Klebebandes in seiner ursprünglichen und verklebten Form, in der die Schichtdicken so dargestellt sind, daß sie die Konstruktion und den Aufbau des Klebebandes erkennen lassen,

Figur 2

die erfindungsgemäße Verwendung des Klebebandes bei Verklebung auf einem Versandumschlag

Figur 3

einen vergrößerten Ausschnitt der Darstellung in Figur 2 mit dem aufgeklebten Klebeband,

Figur 4

eine Darstellung gemäß Figur 3, gezeigt wird die erfindungsgemäße Verwendung des Klebebands, wenn es teilweise von der Oberfläche des Versandumschlages abgelöst ist,

Figur 5

eine Schnittzeichnung gemäß Figur 1, die die Verhältnisse der einzelnen Schichten zeigen, wenn das erfindungsgemäß verwendete Klebeband erstmalig vom Versandumschlag abgezogen wird.

Figuren 6 und 7

Varianten der Eindeckung der mit Klebemasse beschichteten Seite des an der Verschlussklappe angebrachten, erfindungsgemäß verwendeten Klebebandes

A particularly advantageous embodiment of the adhesive tape used according to the invention, as well as the application and the function, are explained in more detail with reference to the figures described below, without wishing to restrict the invention unnecessarily. Show it

Figure 1

2 shows a sectional drawing of an adhesive tape used for the use according to the invention in its original and glued form, in which the layer thicknesses are shown in such a way that they show the construction and structure of the adhesive tape,

Figure 2

the use of the adhesive tape according to the invention when glued to a shipping envelope

Figure 3

3 shows an enlarged section of the illustration in FIG. 2 with the adhesive tape stuck on,

Figure 4

3 shows the use of the adhesive tape according to the invention when it is partially detached from the surface of the envelope,

Figure 5

2 shows a sectional drawing according to FIG. 1, which shows the relationships between the individual layers when the adhesive tape used according to the invention is first removed from the envelope.

Figures 6 and 7

Variants of covering the adhesive-coated side of the adhesive tape used on the closure flap and used according to the invention

According to Figure 1, the adhesive tape 1 consists of a preferably transparent thermoplastic Film 10 with sufficient internal strength, which is as follows ensures described use. The thermoplastic film 10 has an upper one Surface 11 and a lower surface 12.

On the lower surface 12 of the film 10, one is not in a first step full-surface transparent primer layer 14 applied. The primer layer 14 is on the arranged upper film surface 12 that it gives a lettering, which in the case of Detachment of the adhesive tape 1 on the surface of the envelope can be seen.

In a second step, a separating layer 15 is applied to the primer layer 14 and the remaining lower film surface 12. The separating layer 15 consists of a colored material.
The color and the color density are selected so that on the one hand they offer a sufficient color contrast to the usual shipping envelope colors, so that the lettering formed is legible, but they also allow a print 17 of a company logo or brand mark lying on the adhesive layer 16 to be clearly seen through ,

Next is the adhesive layer 16, which has sufficient security against sticking ensures the object to be closed, applied to the separating layer 15.

The primer layer 14 adheres very strongly to the lower film surface 12. The adhesion of the Separating layer 15 on lower film surface 12 is less than that of separating layer 15 on the primer layer 14. The adhesion of the adhesive layer 16 to the release layer 15 is greater than the adhesion of the separating layer 15 to the lower film surface 12 and at least as great as the adhesion of the separating layer 15 to the primer layer 14.

The adhesion of the adhesive layer 16 to a surface in accordance with the use is greater than the adhesion of the separating layer 15 on the lower film surface 12. In areas in which is in the layer structure, the primer layer 14 is the liability of Primer layer 14 on the lower film surface 12 and on the separating layer 15 is greater than the adhesion of the adhesive layer 16 to a surface according to the use.

The adhesion of the separating layer 15 to the lower film surface 12 is less than the adhesion of the separating layer 15 to the adhesive layer 16.
A preferably transparent separating layer 13 is applied to the upper surface 11 of the film carrier 10 and adheres relatively strongly to the upper surface 11. The adhesion of the separating layer 13 to the adhesive layer 16 is low, so that the adhesive tape 1 wound into a roll can be unwound without the separating layer 15 separating from the lower film surface 12.

In this process or in a further process, the outer surface of the Adhesive 16 applied a colored print 17 of a company logo or trademark become.

On the outer surface of the adhesive 17, a full surface or only partially. the be applied across the entire width of the adhesive tape 1 covering release liner 18, the front the use according to the invention, the closing of the envelope, removed becomes.

The preferred embodiment of the adhesive tape for the use according to the invention is shown as 1 according to FIG. 2, the adhesive tape being used for securing or closing an object such as a shipping envelope 2. The shipping envelope 2 has a closure flap 3 and an envelope surface 4. The closure flap 3 is folded down onto the line 5 to close the shipping envelope 2. The adhesive tape 1 is glued to both the closure flap 3 and the envelope surface 4.
In order to get to the contents of the shipping envelope 2 without later noticing the attempt to open it, the adhesive tape 1 in the area of the line 5 must be removed in order to be able to unfold the flap 3. If the adhesive tape 1 used is a commercially available adhesive tape, after removing the contents from the closure flap 2 and carefully re-adhering the adhesive tape 1, it cannot be seen that the adhesive tape 1 has been removed before.

However, an adhesive tape 1 according to the invention is used to close the envelope used, opening and closing in the manner described is not unnoticed possible.

If the adhesive tape 1, with a structure according to Figure 1, as shown in Figure 3 on a Is glued surface is due to the preferred transparency of the separation layer 13 and Foil carrier 10 and the primer layer 14, the uniform color of the color layer 15th visible and optionally the color layer translucent through the adhesive layer 16 17th

If the adhesive tape 1 - as shown in Figure 4 - from the surface of the Shipping envelope is detached, the adhesive tape 1 separates according to Figure 5. The separating layer 15 separates in the area in which it is in direct contact with the Film surface 12 is from the film 10 and remains on the envelope surface 4. In the area in which the primer layer 14 is located, the separates Adhesive layer 16 from the cover surface 4 and remains on the carrier film 10. The word "OPENED" is visible as lettering on envelope surface 4 and as more direct colored lettering on the carrier 10.

When the detached part of the adhesive tape is replaced, the remains. lettering "OPENED" visible because it passes through the air layer at the interface between the separation layer 15 and film surface 12 a changed light refraction compared to the interface of Primer layer 14 and film surface 12 causes and thus an optical contrast forms.

Furthermore, the lettering on the carrier film 10 by the when applying and Detaching deformed carrier 10 is no longer congruent in the free lettering on the Insert cover surface.

Figures 6 and 7 illustrate possibilities in the use of the invention Adhesive tape, the layer of adhesive 16 protruding on the closure flap 3 applied adhesive tape 1 with a release liner 18 to cover an automatic To prevent the envelope 2 from closing.

FIG. 6 shows the case of covering with a release liner 18 when the adhesive tape 1 is not in place offset location. This results in an overlap of the release liner 18 with the Flap 3 on its underside.

FIG. 7 shows the case of covering with a release liner 18 for the adhesive tape 1 offset position. The Release Liner 18 does not protrude beyond the Flap 3 glued edge of the adhesive tape 1 also. For both in Figures 6 and 7 The cases shown result from the overlap or the excess of the release Liners 18 handling aids for the user of the envelope.

It is also possible to cover the adhesive tape 1 with the release liner, in which by relocating the release liner 18 both cases of covering as in Figure 6 and 7 described arise.

The inventive concept encompasses the use of the adhesive tape set out in the claims as a security closure for clearly recognizing an unauthorized attempt to open or an opening for a large number of valuable or sensitive goods. An important field of application is the protection of various consumer goods against theft, falsification of content and protection against pirated copies. The unnoticed opening, theft and falsification of sensitive goods is avoided by using the adhesive tape set out in the claims.
The use of the adhesive tape set out in the claims is particularly suitable for securing the opening or packaging of shipping envelopes, bags, envelopes, pouches and the like, for example made of polyethylene or easily cleavable cardboard packaging, due to the slight internal separation over the entire surface when the adhesive tape is removed.

In the following, the invention will be explained using an example without the invention want to limit unnecessarily.

example a: slide a

A biaxially stretched, coextruded film based on polypropylene from Siliconature is used. Film thickness: 28 µm Labelling: Radil T Company / Manufacturer: Radici Elongation at break along: 130% Elongation at break across: 50% Elastic modulus along 2500 N / mm ² Young's modulus across 4000 N / mm ²

The surface of the film that is coated with a primer layer and a release layer is treated with Corona adhesive before coating. The surface energy is> 42mN / m.

b: Adhesives used, primer layer, release layers and release liner b1: release coating

A release varnish based on a standard 100% silicone system (UV-curing) is used Production of the adhesive tapes according to the invention used.

b2: primer layer

A primer layer based on an aqueous polyurethane dispersion is used to produce the adhesive tapes according to the invention.
Name: NeoRez R560 from Zeneca resins, The Netherlands

b3: interface

A release layer based on a solvent-based printing ink is used to produce the adhesive tapes according to the invention.
Description: 15VAA printing ink from Michael Huber München GmbH, Germany

b4: adhesive:

An adhesive based on an aqueous acrylate dispersion is used to produce the adhesive tapes according to the invention.
Description: Primal PS83D from Rhom & Haas, Germany

b5: release liner

A release paper based on a 100% silicone system is used.
Description: KS 900 yellow 52B / 52B 8 from Laufenberg, Germany

c: Production of the adhesive tapes c1: Applying the release coating

The film a is coated with a standard silicone-based release coating using the usual standard technology

c2: Coating of the primer layer:

The film c1 is coated with the primer layer using the flexographic printing technique. Here, a flexographic printing block is used, the raised parts of the word Show "OPENED".

The laboratory flexographic printing plate and the web speed are set so that after drying, a mass application of about 1 to 3 g / sqm of the primer layer was measured becomes. The coating takes place on a laboratory coating system with a working width of 500 mm and a coating speed of 10 m / min. Behind the coating station with a wire knife applicator there is a drying tunnel that can be heated with hot air (approx. 100 ° C) is operated. The coated film was immediately used without any storage time.

c3: coating of the separating layer

The film c2 is coated with the separating layer by means of a wire doctor. The Wire doctor and the coating speed are set so that after the Drying the coated film, a mass application of the separation layer of about 25 g / sqm is measured. The coating was carried out on a coater with a Working width of 500 mm and a coating speed of 10 m / min. Behind the There is a drying tunnel in the coating station, which can be heated with hot air (approx. 100 ° C) is operated. The coated film is immediately used without storage.

c4: coating of the adhesive

The film c3 is coated with the adhesive by means of a wire doctor. The Wire doctor and the coating speed are set so that after the Drying of the coated film a mass application of about 25 g / sqm is measured. The Coating was carried out on a technical coater with a working width of 500 mm and a coating speed of 10 m / min. Behind the coating station with Wire knife applicator there is a drying tunnel with hot air (approx. 100 ° C) is operated.

c5: Cover with release liner

After drying in a laminating unit, the bale-shaped adhesive web is coated with the Release liner covered.

c6: assembly

The coated film was made up to a width of 25 mm.

d: results.

To determine the application of mass, a circular pattern with a known surface area is cut out of the coated film and weighed. The adhesive is then removed by dissolving with acetone and the film, which is now free of adhesive, is weighed again. The mass application in g / m ^{2 is} calculated from the difference.

To determine the security effect, the adhesive tapes produced according to the example were examined. To characterize the security effect on shipping envelopes, adhesive tapes of the adhesive tapes were stuck to the flap by simultaneously adhering to the flap and the surface of the envelope, and pressed on with a 2 kg steel roller (roll over twice). The adhesive strip was then removed manually immediately after a waiting period of 24 hours at 23 ° C. Gluing on Shipping envelope polyethylene Cardboard envelope Oppression Yes Yes surface printed printed Letters transfer Very good Very good Clear security effect Yes Yes Unnoticed opening of the envelope on the flap Not possible Not possible packaging security Very good Very good

Claims (11)

Use of a multilayer adhesive tape with a carrier based on an oriented thermoplastic film, an upper surface and a lower surface, on the lower surface of which at least the following layers are applied: a) a primer layer not applied over the entire surface, the primer layer being very well anchored on the thermoplastic film, b) a separating layer applied over the entire surface of the applied primer layer and the free thermoplastic film surface, the separating layer being anchored better on the primer layer than on the thermoplastic film, c) a pressure-sensitive adhesive applied over the entire surface of the release layer, which is better anchored on the release layer than the release layer on the thermoplastic film, for closing shipping bags, bags, envelopes, envelopes. Use according to claim 1, characterized in that the thermoplastic film consists of stretched polyolefins or polyester and is in particular transparent. Use according to claims 1 and 2, characterized in that the thermoplastic film consists of stretched HDPE, PVC, PET, monoaxially stretched polypropylene or biaxially stretched polypropylene. Use according to at least one of the preceding claims, characterized in that the adhesion of the primer layer on the thermoplastic film and further layers to one another is improved by corona treatment or flame treatment. Use according to at least one of the preceding claims, characterized in that the applied primer layer on the film surface represents characteristic signs or symbols. Use according to at least one of the preceding claims, characterized in that the separating layer comprises resin dispersions, acrylate dispersions, polymer dispersions or in particular water-based, solvent-based or UV-curing flexographic printing inks. Use according to at least one of the preceding claims, characterized in that the adhesive is based on an aqueous acrylate dispersion. Use according to at least one of the preceding claims, characterized in that the adhesive tape is individualized, preferably by printing with standard colors , in particular on the adhesive side. Use according to at least one of the preceding claims, characterized in that the application amount of the primer layer on the carrier material is 0.5 to 12 g / m², particularly preferably 1.5 to 6 g / m²,
the application amount of the first separating layer on the primer layer is 2 to 18 g / m2, particularly preferably 5 to 11 g / m2. Use according to at least one of the preceding claims, characterized in that the upper surface of the adhesive tape is optionally coated with a release coating. Use according to at least one of the preceding claims, characterized in that the side provided with adhesive is covered completely or partially with a release liner.

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