Methods for Manufacturing Glow in-the-Dark Targets

Abstract

Improvements in methods for manufacturing glow in-the-dark targets are disclosed. This provides an ink that produces images that will glow in the dark for an extended period of time after the ink has been exposed to natural or artificial light. This can be used for flexographic printing, offset printing, gravure printing, and screen printing applications. The ink includes a phosphorescent pigment and optionally includes a colorant on a substrate of paper, plastic or metal. The phosphorescent pigment material is not coated prior to mixing with other ink components. The pigment material has a particle diameter size of about 600 mesh to about 1500 mesh. The ink includes a colorant (optional), a thermoplastic resin binder, a charge-controlling agent, a release agent, as well as the phosphorescent pigment.

Claims

1. A method for manufacturing glow in-the-dark targets comprising: a phosphorescent ink for producing a phosphorescent image on a substrate by a printing process, the phosphorescent ink consisting of; a total amount of aqueous and solvent resin binder; an uncoated phosphorescent pigment for forming a phosphorescent image on the substrate; said uncoated phosphorescent pigment being a material selected from a group consisting of alkaline earth aluminates and alkaline earth metal aluminate oxides, phosphors represented by the general formula: and combinations of the materials; said uncoated phosphorescent pigment being a blend of an aqueous and a solvent resin binder in a single mix process; said single mix process being micronized, and wherein said phosphorescent ink has an average particle size in the range of between 600 mesh and 1500 mesh.

2. The phosphorescent ink according to claim 1 wherein said uncoated phosphorescent pigment is present in the range of 18% to 30% by weight.

3. The phosphorescent ink according to claim 1 wherein said aqueous and said solvent resin binder comprises a material selected from the group consisting of one or more of polyester resins, epoxy resins, latex-based resins, plant oil and bio-based polymer resins.

4. The phosphorescent ink according to claim 1 further comprising a charge-controlling agent.

5. The phosphorescent ink according to claim 4 wherein the charge-controlling agent comprises an organic pigment.

6. The phosphorescent ink according to claim 1 further comprising a colorant.

7. The phosphorescent ink according to claim 1 further comprising a releasing agent.

8. The phosphorescent ink according to claim 1 wherein said Phosphorescent ink is used with flexographic printing, offset printing, gravure printing or printing.

9. The phosphorescent ink according to claim 1 wherein said Phosphorescent ink is applied onto paper, plastic or metal.

10. The phosphorescent ink according to claim 1 wherein said phosphorescent image is colorless in daylight when colorant is used.

11. The phosphorescent ink according to claim 1 wherein said particle size of 600 mesh is 25 microns.

12. The phosphorescent ink according to claim 1 wherein said particle size of 1500 mesh is 10 microns.

13. The phosphorescent ink according to claim 1 wherein said Phosphorescent ink is yellow, green, blue, orange or a combination thereof.

14. The phosphorescent ink according to claim 1 wherein said Phosphorescent ink Phosphorescent pigment is charged with sunlight or artificial illumination applied to the front, back or both sides of said target.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING(S)

[0024] FIG. 1 shows a target 100, including an image 101 formed on a surface of a substrate

[0025] FIG. 2 shows a cross-sectional view of the printed target.

[0026] FIG. 3 shows a flow chart of making and printing the using the glow in-the-dark targets.

DETAILED DESCRIPTION OF THE INVENTION

[0027] The following description is provided to enable a person skilled in the art to make and use the invention and sets forth the best mode contemplated by the inventors of carrying out their invention. Various modifications to the description, however, will remain readily apparent to those skilled in the art, since the general principles of a phosphorescent ink for forming a glow-in-the-dark image and methods of forming and using the ink are defined herein.

[0028] FIG. 1 shows a target 100, including an image 101 formed on a surface of a substrate 102. As set forth in more detail below, image 101 contains phosphorescent pigment that when placed in natural or “artificial” light absorbs the light as a form of energy. This energy is then released as light when device 100 is placed in a dim light environment, such that the image glows in the dark for an extended period of time without external illumination.

[0029] In this figure It is contemplated that just the background 110 can include glow-in-the-dark phosphorescent pigment, the silhouette can be printed with glow-in-the-dark phosphorescent pigment, skin elements are printed with glow-in-the-dark phosphorescent pigment, or the vital target areas are printed with glow-in-the-dark phosphorescent pigment. It is further contemplated that different areas can be printed with glow-in-the-dark phosphorescent pigment, or that different overcoat printing are used to alter the intensity of illumination from different areas of the target.

[0030] The target images are printed with different ink colors including, but not limited to, pantone ink colors, process ink colors and the phosphorescent light emitting pigments.

[0031] It is contemplated that the front of the target can be nearly completely covered and the glow-in-the-dark phosphorescent pigment is charged by illuminating the rear portion of the target through the substrate 102. The phosphorescent pigment can be charged with sunlight or artificial illumination applied to the front, back or both sides of the target.

EXAMPLE

[0032] FIG. 2 shows a cross-sectional view of the printed target 100. The prepared mono-component ink 101 is printed on a substrate 102 such as a multipurpose 60 lb paper, a transparent image was formed using this ink. An overcoat or filtering image 103 is shown placed over a portion of the mono-component ink 101 whereby a different amount of illumination is visible from the coated and uncoated portions of the mono-component ink 101. While an overcoat 103 is shown the overcoat 103 can be removed to provide a single-pass printing operation.

[0033] When the printed image of the mono-component ink 101 is exposed to natural sun light for fifteen minutes, the mono-component ink 101 absorbs energy from the natural light.

[0034] When the printed image is mounted on a target clamp and sent down range in a low level light environment the printed image illuminates with a yellow, green, blue, or orange light in the dark. This yellow, green, blue or orange image was noticeable in the lower level lighting environment until the absorbed energy had dissipated. This process can be performed on a plastic and metal substrates. When an image of three rings is printed on the paper, plastic and metal substrates and the printed sample is mounted in target clamps and sent down range. The printed sample is essentially transparent in color in normal range lighting conditions. The image remains in normal range lighting until the target is sent down range. As the light down range dissipates, a light yellow, green, blue or orange glow of the three rings is visibly noticeable.

[0035] In this printing process of screen printing phosphorescent pigment is described as “Mesh”, but can also be described as Microns. The larger the mesh, the greater the size of phosphorescent particulates can be screened onto the substrate. A typical ratio of Mesh to Microns is shown below herein.

[0036] 600 Mesh=25 Microns.

[0037] 1500 Mesh=10 Microns.

[0038] FIG. 3 shows a flow chart of making and printing the using the glow in-the-dark targets. In the preferred embodiment, the phosphorescent ink for producing a phosphorescent image on a substrate by a printing process, the phosphorescent ink is with a total amount of aqueous and solvent resin binder, an uncoated phosphorescent pigment for forming a phosphorescent image on the substrate. The uncoated phosphorescent pigment 201 is blended 200 with the total amount of the aqueous and solvent resin binder 202 in a single mix process. The single mix process 203 is the micronized. The uncoated phosphorescent pigment can be one or more of alkaline earth aluminates and alkaline earth metal aluminate oxides, phosphors represented by the general formula. The phosphorescent ink has an average particle size in the range of about 600 mesh to 1500 mesh.

[0039] The uncoated phosphorescent pigment is present in the range of about 18% to about 30% by weight. The aqueous and solvent resin binder 204 comprises a material selected from the group consisting of one or more of polyester resins, epoxy resins, latex-based resins, plant oil and bio-based polymer resins.

[0040] It is further contemplated that a charge-controlling agent can be used where the charge-controlling agent 205 is an organic pigment. The phosphorescent ink can also include a colorant 207 and or a releasing agent 206.

[0041] This printing technique is suited for a variety of different printing processes 208 including, but not limited to, flexographic printing, offset printing, gravure printing, screen printing and the like can be used.

[0042] Thus, specific embodiments of methods for manufacturing glow in-the-dark targets have been disclosed. It should be apparent, however, to those skilled in the art that many more modifications besides those described are possible without departing from the inventive concepts herein. The inventive subject matter, therefore, is not to be restricted except in the spirit of the appended claims.