Stock material or miscellaneous articles – Layer or component removable to expose adhesive
Patent
1997-08-07
1998-12-22
Evans, Elizabeth
Stock material or miscellaneous articles
Layer or component removable to expose adhesive
428195, 428201, 428209, 4284231, 428915, B32B 300
Patent
active
058516158
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a tamper indicating security item and a joining method and is particularly useful in packaging applications.
The market penetration of optically variable effect generating devices such as holographic security devices is increasing and new ways to use such devices are constantly being developed. Holographic security devices require sophisticated equipment for their manufacture and this combined with their visual effectiveness makes them highly desirable as anticounterfeiting and antitamper features.
Holographically imaged labels can be provided on a variety of security articles. Films exhibiting holographic images or other light diffracting patterns are available for the packaging industry as plain wrapping films.
To prevent and/or allow the detection of tampering with goods including fast moving consumer goods, many manufacturers have introduced tamper resistant or tamper indicating packing. For example, plastic seals are often shrunk over the closures of bottles to prevent or allow the detection of any tampering with the contents of the bottle.
Shrink sleeve or shrink wrap packaging is well known. The underlying principle behind this is that a mono-axially or biaxially orientated thermoplastic polymeric film is placed over the article to be protected as a loose fit. When the film is heated to above a certain temperature, the plastic shrinks as the strain imparted during the orientation process is released.
Smurfit Precision Labelling has recently introduced an holographic tamper evident shrink sleeve for use in the packaging industry. Here a type of shrink wrap film is made and this has a holographic band affixed to it which is perforated.
To open the protected closure, the shrink wrap film is removed: the removal action causes tearing along the line of perforations to cut the holographic device in two. Such films may be poly (vinyl chloride) or a polyester such as poly(ethylene terephthalate). It is also possible, however, to slit the sleeve elsewhere and remove the sleeve without damaging the holographic device.
Holographic tear tapes are also offered by Applied Holographics Ltd along with PP Payne Ltd.
Packaging material with an holographic pattern is disclosed in WO 93/08084 and holographic adhesive tape is disclosed in EP 585076A.
Transferable holographic packaging films are disclosed in GB-A-2069409.
Tamper evident holographic labels for adhering to a surface are also known in which when the upper layer is mechanically peeled away delamination at the interface between the metallic reflective coating and the finely embossed diffractive surface occurs. In such instances when the layers are separated, they cannot be recombined and the loss of such intimate layer contact means that the holographic effect is immediately, unexpectedly and irreversibly destroyed.
Polypropylene tamper evident labels can withstand the conditions required for hot lamination if the correct grade and surface bonding characteristics are employed, and because of their strength, polyester holographic labels are generally tamper resistant. However, they can be cut and removed and then used on counterfeit or tampered products although they can be treated or be provided with added layers to reduce this problem.
US Banknote Co (USBC) makes a polyester hologram and coats this on both sides with a hot melt adhesive. Then one of the adhesive layers is coated with a diamond pattern of a pressure sensitive adhesive ("psa"). This psa is used to hold the hologram in position when the core is labelled prior to the single ply poly(vinyl chloride) film being applied.
USBC has used the approach of adhering the hologram to the surface of the security printed plastic, for example by an automatic labelling machine, subsequent to which the single ply PVC laminating film is applied.
EP-A-0585076 illustrates a tape formed from an oriented base film of thermoplastic plastics material coated with a pressure sensitive adhesive composition on one surface and with a release agent on another surface and including a security device
REFERENCES:
patent: 4608288 (1986-08-01), Spindler
patent: 4913504 (1990-04-01), Gallagher
patent: 5085514 (1992-02-01), Mallik et al.
patent: 5683774 (1997-11-01), Faykish et al.
De La Rue International Limited
Evans Elizabeth
LandOfFree
Tamper indicating security item and joining method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Tamper indicating security item and joining method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tamper indicating security item and joining method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2043926