DESC:FORM 2

THE PATENTS ACT, 1970

(39 of 1970)

&

THE PATENT RULES, 2003

COMPLETE SPECIFICATION

[See Section 10 and Rule 13]

TITLE:

“A SUSTAINABLE PAPER HOLOGRAM AND A METHOD OF PREPARATION THEREOF”

APPLICANTS:

Holostik India Limited

A company incorporated under the Indian Companies Act, 1956,
having address at C117, Sector 2, Noida – 201301, Uttar Pradesh, India;

And

Ritesh Rupramka

a citizen of India, having address at C117, Sector 2, Noida – 201301, Uttar
Pradesh, India

PREAMBLE TO THE DESCRIPTION:
The following specification particularly describes the invention and the manner in which it is to be performed:
FIELD OF THE INVENTION
The present invention relates to the field of hologram. More particularly, the present invention relates to a sustainable paper based hologram used for security or product authentication purposes and its method of preparation.
BACKGROUND OF THE INVENTION
A hologram is a photographic recording of an interference pattern that can reproduce a three-dimensional light field using diffraction. The reproduced light field generates an image having a depth, parallax and other properties of the original scene. In other words, it is an encoding of the light field as an interference pattern of variations in the opacity, density, or surface profile of the photographic medium.
When suitably lit, the interference pattern diffracts the light into an accurate reproduction of the original light field, and the objects that are in it exhibit visual depth cues such as parallax and perspective that changes realistically with the different angles of viewing. Therefore, holograms do not have just the illusion of depth but are truly three-dimensional images.
Holograms are mainly used for security purposes or product authentication purposes, as they are replicated from a master hologram that requires expensive, specialized and technologically advanced equipment, and are thus difficult to forge. They are used widely in many currencies, and also found in credit and bank cards as well as passports, ID cards, books, food packaging, and sports equipment. Such holograms come in a variety of forms, from adhesive strips that are laminated on packaging for fast-moving consumer goods to holographic tags on electronic products. They often contain textual or pictorial elements to protect identities and separate genuine articles from counterfeits. Currently, holograms are made of PET film/polymer film/plastic film.

RU2432264C2 discloses a security product containing a substrate material comprising holographic metal microplate, in which the microplate carries a surface relief diffraction structure and can be authenticated by verification using a holographic device by means of lighting and visual inspection using magnification means, and which can also be authenticated by checking with increasing aperture in the metal nickel microplates carrying authentication code. However, the major drawback of the holographic metal plate is that it suffers with the issue of sustainability.
KR100431157B1 discloses a secure holographic image on paper, comprising a paper support having two planes, one of said surfaces being an adhesive layer, a holographic element, in turn comprising a metallized holographic image, wherein the metallized holographic image comprises at least two holograms within which one of the holograms can be viewed only by incoherent light and the other of the holograms can be viewed only by coherent light, is formed on the photosensitive element on the polymer support by at least two image processing steps and then the holographic image is metallized and then coated with an adhesive so that the metallized holographic image is thereafter is transferred from the polymer support to the paper support, which transfers the adhesive layer coated on the metallized holographic image at and the polymer support is placed on the paper support by transferring all of the metal treated portions of the holographic image to the paper support and leaving a holographic image on a polymer support suitable for reuse.
The existing state of art concludes that with hologram that is made of PET film/polymer film/plastic film, there is issue with sustainability as well as non-biodegradability. All manufacturing companies are sensitive for their product security and prefer to use hologram to prevent duplicity or counterfeiting of their genuine products. However, due to sustainability issue many of these are unable to use it. Moreover, with the PET film based hologram, there exists a problem of ink adhesion on PET film.

Therefore, in view of above drawbacks, there is a need to provide a suitable alternative by replacing PET based hologram with a sustainable solution and hence, to develop eco-friendly paper-based holograms for product safety with greener approach that does not affect the environment.
OBJECT OF THE INVENTION
The main object of the present invention is to provide a paper based hologram for security or product authentication purposes.
Another object of the present invention is to provide a method of development of paper based hologram with environmentally sustainable greener approach.
Yet another object of the present invention is to provide a sustainable paper based hologram that is available in different colours.
Yet another object of the present invention is to provide a sustainable paper based hologram that is prepared by method that is easy and reuses/recycles PET (polyethylene terephthalate/polyester) film, which is used for transferring holography.
Yet another object of the present invention is to provide a sustainable paper based hologram prepared by transferring the holographic image/metal from PET film with the help of an adhesive transfer at a rate of range between 90-99%.
Still another object of the present invention is to provide a sustainable paper based hologram that is tampered as well as non-tampered.
SUMMARY OF THE INVENTION
The present invention relates to a sustainable paper based hologram and a method of preparation thereof.
In an embodiment, the present invention provides paper based hologram as an environmentally sustainable alternative, to replacement of PET (polyethylene terephthalate/polyester) based hologram, for security or product authentication purposes.
In another embodiment, the present invention provides a sustainable paper based hologram comprising of, a special grade PET film having release and embossable coating, aluminium metal for metallization, a paper, an adhesive for transferring holographic image from PET film, and a pressure sensitive adhesive (PSA) for converting holographic paper to pressure sensitive hologram label. The pressure-sensitive hologram labels offer a sustainable and secure anti-counterfeiting solution by combining holographic technology with environmentally friendly materials and adhesive properties. This approach not only enhances product security but also contributes to environmental preservation by utilizing biodegradable and recyclable materials. As industries embrace sustainable practices, pressure-sensitive hologram labels represent a step towards greener anti-counterfeiting measures that prioritize consumer safety and environmental responsibility.
In another embodiment, the present invention provides a method for preparation of paper based hologram comprising steps of (a) preparing a film of PET based hologram using special PET having release coating, (b) coating a special type of adhesive on a paper and laminating the paper with the film of PET of step (a) having a hologram image/metal, (c) delaminating the film of PET of step (b) to transfer the hologram image/metal to the paper permanently; and (d) converting the paper obtained in step (c) into label stock using a pressure sensitive adhesive to obtain a paper based hologram.
The present invention relates to development of paper-based hologram for use in products for security and product authentication purposes as a suitable environment-friendly alternative to replace PET based hologram.
The above objects and advantages of the present invention will become apparent from the hereinafter set forth brief description of the drawings, detailed description of the invention, and claims appended herewith.
BRIEF DESCRIPTION OF THE DRAWING
An understanding of the method of preparation of sustainable paper based hologram for security and/ or product authentication of the present invention may be obtained by reference to the following drawing:
Figure 1 is a flow diagram of method of preparation of sustainable paper based hologram for security and/ or product authentication according to an embodiment of the present invention.
DESCRIPTION OF THE INVENTION
The present invention will now be described hereinafter with reference to the accompanying drawings in which a preferred embodiment of the invention is shown. This invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiment set forth herein. Rather, the embodiment is provided so that this disclosure will be thorough, and will fully convey the scope of the invention to those skilled in the art.
Many aspects of the invention can be better understood with references made to the drawings below. The components in the drawings are not necessarily drawn to scale. Instead, emphasis is placed upon clearly illustrating the components of the present invention. Moreover, like reference numerals designate corresponding parts through the several views in the drawings. Before explaining at least one embodiment of the invention, it is to be understood that the embodiments of the invention are not limited in their application to the details of construction and to the arrangement of the components set forth in the following description or illustrated in the drawings. The embodiments of the invention are capable of being practiced and carried out in various ways. In addition, the phraseology and terminology employed herein are for the purpose of description and should not be regarded as limiting.
The present invention relates to a sustainable paper based hologram and a method of preparation thereof.
In an embodiment, the present invention provides a paper-based hologram as an environmentally sustainable alternative to the replacement of a PET-based hologram for security or product authentication purposes.
In In another embodiment, the present invention provides a sustainable paper-based hologram comprising: a special grade PET film having release and emboss-able coating; aluminium metal for metallization; a paper; an adhesive for transferring holographic images from PET film; and a pressure-sensitive adhesive (PSA) for converting holographic paper to a pressure-sensitive hologram label.
In another embodiment, the present invention provides a method for the preparation of a paper-based hologram comprising steps of: (a) preparing a film of PET-based hologram using a special PET with a release coating on it; (b) coating a special type of adhesive on a paper and laminating the paper with the film of PET of step (a) having a hologram image or metal; (c) delaminating the film of PET of step (b) to transfer the hologram image or metal to the paper permanently; and (d) converting the paper obtained in step (c) into label stock using a pressure-sensitive adhesive to obtain a paper-based hologram. Here, the remaining PET film from step (c) after transferring the hologram is recycled easily and reused several times.
The proposed method of preparation of a sustainable hologram includes the steps of:
a) preparing a holographic intricate interference pattern;
b) mastering the holographic pattern of step a) on a master plate;
c) recombining master plate of step c) to create multiple images from a single image using optical method;
d) creating of a shim by electroforming recombined master plate for replication of the holographic pattern;
e) embossing the holographic pattern using the shim of step d) on a film of polyethylene terephthalate (PET), said PET having a release coat on its surface;
f) coating a layer of adhesive on a substrate;
g) laminating the coated substrate of step f) with the PET film of step e) having the holographic pattern;
h) delaminating the film of PET from the substrate to transfer the holographic pattern to the substrate permanently; and
i) converting the substrate obtained in step h) into label stock us-ing a pressure sensitive adhesive to obtain the sustainable holo-gram.

It is further disclosed that the laminating of coated substrate is performed by cold foiling thus obviating need of waiting time in hot rooms. Further the method obviates requirements of curing the material before delaminating, hence saving further time in the batch process. The adhesive is a pressure sensitive adhesive; and the method has a transfer efficiency of holographic pattern to substrate is in range of 90-99%.
Recombining is the process of converting a single image to multiple images on a single plate for mass production. Normally a single optical image is originated using a sophisticated master origination machine and thereafter for mass reproduction, single image is converted into a larger format shim. This process requires the use of special chemicals and a highly accurate XY table and monitored heat & pressure.
The pressure-sensitive hologram labels provide comprehensive features to enhance both product security and environmental sustainability. Firstly, these hologram labels incorporate intricate holographic security elements, including 3D images, color shifts, and detailed patterns, which are difficult to replicate, thereby enhancing product authenticity. Further, the base materials utilized in pressure-sensitive hologram labels are sourced from environmentally friendly sources, ensuring biodegradability and minimizing long-term environmental impact. Thus, the materials align with global sustainability goals and reflect a responsible approach to product packaging and authentication. Additionally, brands benefit from the flexibility to customize holographic designs with logos, symbols, or other unique identifiers, creating visually striking and easily recognizable elements that resonate with consumers. Furthermore, pressure-sensitive hologram labels can be engineered with tamper-evident properties, enabling swift detection of any attempted product manipulation through visible damage to the holographic features. The recyclability of materials used in the hologram labels contributes to the economy by minimizing waste generation and promoting resource efficiency. Hence, the pressure-sensitive hologram labels represent a multifaceted solution that combines cutting-edge security features with a commitment to environmental benefit and enhances both brand protection and sustainability efforts.
The biodegradable paper holograms use sustainable substrates derived from sources like plant-based cellulose. The method uses advanced holographic printing and laser writing technologies to create 3D holographic images on biodegradable paper, utilizing lasers for precise and secure results. These holograms are integrated into packaging, such as labels, seals, or directly embedded into the product material, providing security. Thus, biodegradable paper holograms provide a significant advancement in sustainable and secure anti-counterfeiting measures. Hence, combining holographic technology with environmentally friendly materials addresses both product security and ecological concerns and is used in packaging and product authentication.
Referring to Figure 1, a flow diagram of the method of preparation (100) of a sustainable paper-based hologram is depicted. The sustainable or biodegradable paper-based hologram method (100) for security or product authentication comprises designing the hologram, mastering the hologram (101), recombining the master from a single image to a multiple image (103), shim making in electroforming (104), embossing on polyester (105), special adhesive coating on polyester (106), transfer of polyester on label stock (107), die-cutting, slitting, and packing-based module (108).

The method of preparation of a sustainable paper-based hologram (100) comprises the following steps:
Step 1: Designing the Holographic Pattern using specialized software capable of generating the intricate interference patterns required for holography.
Step 2: Mastering the Hologram (101)
This includes finalizing the holographic pattern design and then transferring the design onto a master holographic plate or film using a laser system that exposes the plate or film to the interference pattern, thus creating a physical representation of the holographic image.
Step 3: Recombining the Master from a Single Image to Multiple Images (103)
This includes modifying the master holographic plate or film to create multiple images from a single image using digital techniques or optical methods.
Step 4: Shim Making in an Electroforming-Based Module (104)
This includes the creation of shims through electroforming based on the modified master holographic plate or film, which will be used for replication.
Step 5: Embossing on Polyester (105)
This includes replicating the holographic pattern onto a large number of substrates, such as biodegradable paper, by embossing the pattern onto polyester.
Step 6: Special Adhesive Coating on Polyester (106)
This includes transferring the holographic pattern from the polyester onto the paper substrate using cold foiling through adhesive, forming a special adhesive coating on the polyester. Transferring the holographic image/metal from PET film with the help of an adhesive transfer at a rate of range between 90-99%.
Step 7: Transfer of Polyester to the Label Stock-Based Module (107)
This includes converting the hologram paper into label stock by applying pressure-sensitive adhesive, resulting in a paper-based hologram.
Step 8: Die-cutting, slitting, and Packing-Based Module (108)
This includes cutting the coated hologram paper substrate into the desired shape and size, which involves cutting individual holographic stickers or labels or cutting larger sheets of paper into specific shapes for packaging or authentication labels.
Each step contributes to the creation and replication of holographic images on substrates, leading to the final production of holographic stickers, labels, or packaging materials.
Therefore, the present invention provides a comprehensive framework for assessing the biodegradability and sustainability of paper-based holograms. Firstly, the material composition plays a critical role in forming holograms made from organic or biodegradable materials that exhibit higher biodegradability compared to those composed of synthetic materials. Coatings and laminates used for protection and enhancement introduce variability, as some may be biodegradable while others are synthetic and degrade slowly or not at all. Environmental conditions, including temperature, moisture, and microbial activity, further influence biodegradation rates, with optimal conditions facilitating quicker breakdown, particularly when exposed to organic matter-degrading microorganisms. Additionally, the sustainability of hologram production extends beyond biodegradability, encompassing factors like raw material sourcing, energy usage, water consumption, and waste generation. Implementing sustainable practices such as utilizing recycled paper, reducing energy consumption, and minimizing waste output can enhance the overall sustainability of paper-based hologram manufacturing processes. By considering these frameworks, hologram manufacturers can strive towards producing environmentally friendly and sustainable holographic products.
Thus, the present invention provides a suitable alternative to replace PET based hologram by providing environmentally sustainable paper based hologram that serves the same purpose like PET based hologram but gives the benefit of sustainability and is easily available in different colors as compared to the existing PET film based hologram where, there is always challenge for ink adhesion on PET film. Further, the polyester used in the hologram transfer process can be reused multiple times (2-3 times) for embossing and transferring, enhancing sustainability and cost-effectiveness. Furthermore, holography can be provided to a wide range of paper surfaces, including matte finish, smooth finish, and art paper, offering flexibility and adaptability for various applications and has higher durability and strength. Moreover, the holograms do not require any curing time for delamination. The hologram is an on-the-spot holography transfer without the need for waiting in hot rooms, ensuring efficient and immediate results. Additional advantages are as follows:
High Transfer Efficiency: the present method is achieving an impressive transfer rate of approximately 99%, significantly surpassing the typical 70-75% transfer rate of other methods.

Versatile Surface Compatibility: the method is successfully implying holography to a wide range of paper surfaces, including matte finish, smooth finish, and art paper, offering flexibility and adaptability for various applications.

Tape Test Approval: the paper hologram thus obtained successfully passed the tape test, demonstrating their durability and adhesion strength.

Reusable Polyester: The polyester used in the proposed hologram transfer process is capable of being reused multiple times (2-3 times) for embossing and transferring, enhancing sustainability and cost-effectiveness.

Instant Bonding: the obtained paper holograms do not require any curing time for delamination. The method thus offers on-the-spot holography transfer without the need for waiting in hot rooms, ensuring efficient and immediate results.
Example 1
To assess the integrity of the sustainable hologram obtained by the proposed method, a tape test with 3M Scotch Magic Tape was performed.
Materials Used:
Tape: 3M Scotch Magic Tape 810
Substrate: Paper with embossed holographic material
Methodology:
A piece of 3M Scotch Magic Tape 810 was carefully applied to the surface of the embossed holographic paper. The paper was then gently pulled in an upward direction to evaluate the effect on the holographic image.
Observations:
The holographic image and its intricate features remained completely intact and unaffected by the application and removal of the 3M Scotch Magic Tape. No distortion, damage, or alteration to the hologram image was observed during the testing process.
Conclusion:
Based on this evaluation, it can be concluded that the embossed holographic paper, when paired with 3M Scotch Magic Tape 810, maintains its structural integrity and visual clarity even under stress conditions of tape application and removal.

Many modifications and other embodiments of the invention set forth herein will readily occur to one skilled in the art to which the invention pertains having the benefit of the teachings presented in the foregoing descriptions and the associated drawings. Therefore, it is to be understood that the invention is not to be limited to the specific embodiments disclosed and that modifications and other embodiments are intended to be included within the scope of the appended claims. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation. ,CLAIMS:CLAIMS
We claim:
1. A method of preparation of a sustainable hologram, said method com-prising the steps of:
a) preparing a holographic intricate interference pattern;
b) mastering the holographic pattern of step a) on a master plate;
c) recombining master plate of step c) to create multiple images from a single image using optical method;
d) creating of a shim by electroforming recombined master plate for replication of the holographic pattern;
e) embossing the holographic pattern using the shim of step d) on a film of polyethylene terephthalate (PET), said PET having a release coat on its surface;
f) coating a layer of adhesive on a substrate;
g) laminating the coated substrate of step f) with the PET film of step e) having the holographic pattern;
h) delaminating the film of PET from the substrate to transfer the holographic pattern to the substrate permanently; and
i) converting the substrate obtained in step h) into label stock us-ing a pressure sensitive adhesive to obtain the sustainable holo-gram;

wherein,
laminating of coated substrate is performed by cold foiling;
the adhesive is a pressure sensitive adhesive; and
the method has a transfer efficiency of holographic pattern to substrate is in range of 90-99%.

2. The method as claimed in claim 1, wherein the substrate is a biode-gradable paper.

3. The method as claimed in claim 2, wherein the biodegradable paper comprises surfaces including matte finish, smooth finish, or art paper finish.

4. The method as claimed in claim 1, wherein the method includes on-the-spot holographic pattern transfer obviating the need for waiting in hot rooms, ensuring efficient and immediate results.

5. The method as claimed in claim 1, wherein the sustainable hologram obtained is tamper proof.

6. The method as claimed in claim 1, wherein the delaminated PET of step h) reusable for multiple times.

7. The method as claimed in claim 1, wherein transferring of the holo-graphic pattern from PET film is achieved with pressure adhesive.

8. The method as claimed in claim 1, wherein the holographic pattern in-cludes holographic security elements, including 3D images, color shifts, and detailed patterns.