Stamping a coating of cured field aligned special effect flakes and image formed thereby
View Patent ↗A method of forming a security device is disclosed wherein a magnetically aligned pigment coating coated on a first substrate upon a release layer is hot stamped onto another substrate or object. Multiple patches with aligned magnetic flakes can be oriented differently in the form of a patch work or mosaic. For example, a region of stamped aligned flakes having the flakes oriented in a North-South orientation can be stamped onto one region of an object or substrate and another region of stamped same flakes removed from a same substrate can be stamped onto a same object oriented in an E-W orientation. By first aligning and curing flakes onto a releasable substrate, these flakes can be stamped in various shapes and sizes of patches to be adhesively fixed to another substrate or object.
1. A method of forming an image comprising the steps of:
a) coating a first substrate with a pigment coating having field alignable flakes in a carrier; wherein the field alignable flakes are diffractive flakes having a diffractive pattern of grooves therein;
b) applying a magnetic or electric field to the pigment coating so as to align the flakes therewithin along field lines of the magnetic or electric field so that the grooves are parallel to the field lines;
c) after performing step (b) curing the pigment coating;
d) stamping a first region of the cured coated first substrate with a stamp having a first shape to yield a first stamped transferable image formed of aligned flakes;
e) stamping a second region of the first substrate or of a second substrate to yield a second stamped transferable image formed of aligned flakes wherein the aligned flakes have grooves; and,
f) transferring the first and second stamped transferable images to a third substrate or object, wherein the grooves of the aligned flakes in the first stamped transferable image are oriented differently than the grooves of the aligned flakes in the second stamped transferable image providing different visual effects from the first and second stamped transferable images in lighting conditions other than normal incidence.
2. A method as defined in claim 1 wherein the first stamped transferable image is transferred to the third substrate or object while it is being stamped.
3. A method as defined in claim 1 wherein the first stamped transferable image is transferred to the third substrate or object by hot stamping.
4. A method as defined in claim 1 wherein the first stamped transferable image is adhesively transferred to the object.
5. A method as defined in claim 1 wherein the first substrate has a release coating thereon so that the stamped image can be released from the release coating.
6. A method as defined in claim 1 wherein step (d) is performed a plurality of times so as to yield a plurality of stamped images formed of aligned flakes.
7. A method as defined in claim 6 wherein at least some of the applied stamped images are disposed next to each other on the third substrate or object such that their diffractive patterns are not parallel.
8. A method as defined in claim 6 , wherein the stamped images are subsequently transferred to the third substrate or object and wherein one stamped image is applied at least partially over another.
9. A method as defined in claim 1 wherein the field alignable flakes are color-shifting diffractive flakes.
10. A method as defined in claim 1 wherein the first and second stamped transferable images have different shapes or sizes.
11. A method of forming an image comprising the steps of:
a) coating a first substrate with a pigment coating having field alignable flakes in a carrier therein;
b) applying a magnetic or electric field to the pigment coating so as to align the flakes therewithin along field lines of the magnetic or electric field;
c) after performing step (b) curing the pigment coating;
d) stamping a first region of the cured coated first substrate with a stamp having a first shape to yield a first stamped transferable image formed of aligned flakes;
e) stamping a second region of the first substrate or of a second substrate to yield a second stamped transferable image formed of aligned flakes; and,
f) transferring the first and second stamped transferable images to a third substrate or object, wherein the aligned flakes in the first stamped transferable image are oriented differently than the aligned flakes in the second stamped transferable image providing different visual effects from the first and second stamped transferable images in lighting conditions other than normal incidence;
wherein step (b) results in the flakes being aligned at an angle to the first substrate so that at least some of the flakes are substantially upstanding with their faces orthogonal to the substrate.