Systems, methods, and materials for temporary printing and indicia
View Patent ↗Methods and/or systems for printing or otherwise evincing temporary indicia on media with disappearing inks are described along with suitable disappearing ink formulations and media constructions for executing the same. In particular embodiments, the methods and/or systems described employ a plurality of disappearing inks with different disappearing rates. In one embodiment, a barrier layer that is selectively used to cover a major surface of the media is employed to substantially block or otherwise regulate a rate of phase transitions (e.g., evaporation and/or sublimation) experienced by ink borne by the media.
1. A method for providing disappearing inks, said method comprising:
selecting a first ink comprising a first formulation of ingredients prepared to cause the first ink, upon deposition onto an ink receiving media, to disappear therefrom at a first rate; and
selecting a second ink comprising a second formulation of ingredients prepared to cause the second ink, upon deposition onto the ink receiving media, to disappear therefrom at a second rate which is different than the first rate;
wherein disappearance from the media by the first ink is achieved via at least one of evaporation or sublimation and disappearance from the media by the second ink is achieved via at least one of evaporation or sublimation;
wherein the first formulation of ingredients comprises (i) glycerin and (ii) one or more lower boiling point liquids selected from the group consisting of water, methanol, and ethanol;
wherein the second formulation of ingredients comprises (iii) glycerin and (iv) one or more lower boiling point liquids selected from the group consisting of water, methanol, and ethanol; and
wherein a first weight ratio of component (i) to component (ii) in the first formulation of ingredients is different from a second weight ratio of component (iii) to component (iv) in the second formulation of ingredients.
2. The method of claim 1 , wherein neither the first formulation of ingredients nor the second formulation of ingredients comprises a surfactant.
3. The method of claim 1 , wherein component (ii) consists of water.
4. The method of claim 1 , wherein component (ii) consists of ethanol.
5. The method of claim 1 , wherein component (ii) consists of methanol.
6. The method of claim 1 , wherein component (ii) consists of water and ethanol.
7. The method of claim 1 , wherein component (ii) consists of water, ethanol, and methanol.
8. The method of claim 1 , wherein at least one of the first formulation of ingredients and the second formulation of ingredients comprises from 40 to 70 weight percent of glycerin.
9. The method of claim 1 , wherein the first weight ratio is greater than 1 and the second weight ratio is less than 1.
10. The method of claim 1 , wherein the first formulation of ingredients consists of 50 weight percent glycerin, 35 weight percent ethanol, and 15 weight percent water.
11. The method of claim 1 , wherein the first formulation of ingredients consists of 50 weight percent glycerin and 50 weight percent water.