Synthesis of superpostion shape images by light interacting with superposed layers of lenslet gratings
US-2018311990-A1 · Nov 1, 2018 · US
Printing diffraction gratings on paper and board
US8993219B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8993219-B2 |
| Application number | US-201214127292-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jun 20, 2012 |
| Priority date | Jun 21, 2011 |
| Publication date | Mar 31, 2015 |
| Grant date | Mar 31, 2015 |
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Abstract
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A method and an apparatus for forming a surface relief microstructure, especially an optically variable image on a paper substrate are provided, the method comprising the steps of: A) applying a curable composition to at least a portion of the frontside of the paper substrate; B) contacting at least a portion of the curable composition with surface relief microstructure, especially optically variable image forming means; C) curing the composition by using at least one UV lamp ( 1, 2, 3 ) which is arranged on the backside of the paper substrate; D) optionally depositing a layer of a transparent high refractive index material and/or a metallic layer on at least a portion of the cured composition, wherein the lamp ( 1, 2, 3 ) having emission peak(s) in the UV-A and near VIS range and the curable composition comprises at least a photoinitiator which absorbs in the UV-A region and preferably in the near VIS range. A paper product obtainable uses the method and an apparatus for forming a surface relief microstructure on a paper substrate. Surface relief microstructures, such as holograms may be replicated rapidly and with accuracy on a paper substrate by using the method and the apparatus.
First claim
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The invention claimed is: 1. A method for forming a surface relief microstructure on a paper substrate, the method comprising: A) applying a curable composition to at least a portion of a frontside of the paper substrate; B) contacting at least a portion of the curable composition with the surface relief microstructure; C) curing the composition with a UV lamp which is arranged on a backside of the paper substrate wherein the paper substrate moving at a rate of at least 40 m/m…
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- B42D25/42Primary
Operations & Transport · mapped topic
Operations & Transport · mapped topic
Physics · mapped topic
Operations & Transport · mapped topic
Physics · mapped topic
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- What does patent US8993219B2 cover?
- A method and an apparatus for forming a surface relief microstructure, especially an optically variable image on a paper substrate are provided, the method comprising the steps of: A) applying a curable composition to at least a portion of the frontside of the paper substrate; B) contacting at least a portion of the curable composition with surface relief microstructure, especially optically va…
- Who is the assignee on this patent?
- Richert Michelle, Bolle Thomas, Fleury Roland, and 1 more
- What technology area does this patent fall under?
- Primary CPC classification B42D25/42. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Mar 31 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).