IN-565236-B - SHAPED OBJECTS FOR USE IN SECURITY APPLICATIONS

Abstract

The present invention disclosed a shaped object comprising cellulose alone or a composition of cellulose for inclusion in a paper product and process for preparation thereof. The present invention further disclosed a paper product having shaped objects incorporated therein. The shaped objects are used as a security feature for identifying and authenticating security documents.

Inventors

• KADHIRAVAN SHANMUGANATHAN
• PREMNATH VENUGOPALAN
• TUSHAR AMBONE

Dates

Publication Date

20250417

Application Date

20170922

Priority Date

20170922

Claims (1)

1. 1.57 wt b) beating the pulp in valley beater to get required Schopper Riegler (SR) value ranging from 40 to 70 c) combining the pulp of step (b) and the shaped object as claimed in claim 1 by continuous stirring with the overhead stirrer at a speed of 500 to 700 rpm for 20 to 30 minutes d) draining the pulp of step (c) in a semiautomatic sheet former machine to form paper product.

Description

FIELD OF THE INVENTION The present invention relates to a shaped object as security feature for use in identifying and authenticating security documents. More particularly, the present invention relates to a shaped object comprising nanocellulose alone or a composition of nanocellulose for inclusion in a paper product and process for preparation thereof. The present invention further relates to a paper product having shaped objects incorporated therein. BACKGROUND AND PRIOR ART The printing of currency notes involves significant cost, time and administrative effort to the government. Although treasury departments continue to develop cutting-edge security features for currency notes, such as raised print, watermarks, holograms, and security threads, however counterfeiters stay one step ahead in producing fraudulent documents. The problems with known counterfeit protection measures include the expense of some options and the ease with which some options can be overcome, for example by utilizing methods including digital or laser printing, scanning, photography and xerography. To detect and curb such criminal activities, security features needs to be constantly upgraded with new technology. WO2007144657 discloses a planchette for inclusion in a paper product, the planchette comprising one or more regions, wherein the regions are coloured and the colours are visible only under ultra-violet light, and wherein the planchette has a complex shape. EP3228744A1 discloses a use of nano cellulose for increasing dog ear resistance of a paper product, a method of manufacturing a semi-finished paper product suitable for manufacturing a valuable document, a semi-finished paper product as well as a valuable document comprising the nano cellulose coated semi-finished paper product. EP2372019A1 discloses a security fibre in the form of a small strip of paper (1 51 52) is suitable for incorporation into a paper product, for use in counterfeit protection. In example embodiments of the invention, the security fibre (1 51 52) comprises (i) a central region (2) made up of a plurality of different colours (21 22 23 24), and (ii) a sacrificial margin (3 31 32 33 34) adjacent to the coloured region (2). The margin (3 31 32 33 34) includes a varnish. WO2010040991 discloses a security fibre for use in counterfeit protection, the security fibre being suitable for incorporation into a paper product, the security fibre being in the form of a sheet of paper or cellulose-based substrate and comprising a coloured region, wherein the coloured region is made up of a plurality of different colours, characterized in that the security fibre also comprises a first margin and a second margin, the margins being unprinted regions adjacent to the coloured region, such that the coloured region is situated between the first and second margins. WO2010077837 discloses a planchette comprising a combination of a substrate and a composition containing at least one inconstant pigment or dye, wherein the composition is deposed on at least one surface of the substrate. The present invention describes planchettes incorporated into the substrate of secure articles, such as bank notes, passports and tax stamps. These planchettes may take various forms, such as fibers regular shapes (such as circles or stars) irregular shapes (such as polygons) or as threads or stripes running throughout the length of the document and are colored with an ultra color inconstant pigment or dye. WO2012049514 discloses a planchette for a security paper, a security paper containing a plurality of the planchettes, a method for making the planchette and a method for making the security paper. The present invention provides, in a first aspect, a planchette for a security paper, the planchette being a sheet having a first face and a second face, the first face having a first colour and the second face having a second, different, colour. The first face may have a colorant of a first colour and the second face may have a colorant of a second colour. WO2011039199 discloses a security feature, for inclusion in a pulp from which a security paper (50) is to be made, is a sheet (10). The security feature includes a first pigment that fluoresces in response to illumination by UV light of a first, longer, wavelength, and a second, different, pigment that fluoresces in response to illumination by UV light of a second, shorter, wavelength. The sheet (10) is divided into a plurality of regions (20). The first pigment is in a first region, and the second pigment is in a second, different, region. WO2013178986 discloses the use of a particular form of cellulose fibre known as microfibrillated cellulose (MFC), which is incorporated into andor applied to the surface of a paper substrate, to improve the strength of security documents, such as banknotes, made from the substrate and to reduce their uptake of soil due to day to day handling. The currently available solutions in the prior art are in th