THE USE OF A COATED PAPER FOR THE MANUFACTURE OF AN INSTANT LOTTERY TICKET

Abstract: The invention relates to a new lottery ticket paper for the manufacture of different kinds of lottery tickets, especially of the "instant lottery ticket" type, and a method of manufacturing said tickets. The lottery ticket paper is characterized in that it comprises a coloured, opaque base paper coated on both sides with a composition comprising at least one pigment, a filler, a binder solution, and optionally viscosity regulating agents and some kind of security element. The lottery ticket paper is protected against see-through and various kinds of forgery. It is an environmentally pleasing, nonexpensive and from the production-technical point of view suitahle alternative to existing foil-laminated lottery ticket papers.

Description: The present invention relates to the use of a coated paper for the manufacture of instant lottery tickets. Lottery tickets represent a special kind of security print which for reasons of security must be protected against see-through and various kinds of forgery. The lottery tickets hitherto used and sold on the market are protected against see-through by being made from a foil-laminated paper material, usually an aluminium foil laminated to a stiff sheet of paper. The aluminium foil is printed with special printing inks which are volatile and/or require strong solvents. Said inks represent a potential hazard with respect to work environment as well as from a general environmental point of view. Also, the aluminium foil itself is extremely unsuitable from the environmental point of view, both in the manufacture of the foil-laminated sheet of paper itself and in taking care of the waste that is unavoidable in connection with printing and finishing of the product, as well as in destruction of the product after use. Further, as a result of its sensitivity, the aluminium foil poses production-technical problems in the manufacture of aluminium foil laminated lottery tickets. Heavy demands are made as to printing accuracy, since if the foil is bent, folded or "cracked" during printing, the deformation will remain and the products have to be discarded. From the forgery point of view, a multilayer product is unsuitable, since it may be delaminated and tampered with, for example by transferring information from one lottery ticket to another. Further, aluminium foil and sheets of paper are available on the market and can be used by forgers with knowledge of printing technique. In the manufacture of lottery tickets it is of the utmost importance that is should be possible to check the number of lottery tickets made in a simple way. With existing equipment, aluminium foil laminated lottery tickets cannot be machine counted. It is already known to use different types of coated paper for different applications mostly intended for the manufacture of paper with a bright and uniform quality. These coatings are usually very thin and, further, no suggestions have been made for the manufacture of instant lottery tickets by using a see-through protected base paper coated on both sides. According to the present invention there is provided a lottery ticket paper which is protected against see-through and which solves the above-mentioned problems connected with lottery ticket paper made from a foil-laminated paper material. The new tickets are protected against see-through, non-delaminatable, difficult to forge, and have a low grammage which gives low mailing expenses and facilitates storage of finished products. Further, the new tickets are nonexpensive to produce, congenial to the environment and suitable for printing, i.e. may be printed with conventional printing inks and conventional equipment, and may be machine counted using existing equipment. The object of the invention is the use of a coated paper for the manufacture of instant lottery tickets The lottery ticket paper according to the invention is characterized in that it comprises a coloured, opaque base paper which is coated on both sides with a composition comprising at least one pigment, a filler, a binder solution, and optionally viscosity regulating agents. As an extra security feature, the coated paper may comprise some kind of security element, such as security chemicals, visible or non-visible fibres or a combination thereof. The use of a coated paper for the manufacture of an instant lottery ticket according to the invention is defined in claim 1 and in subclaims 2-5. The base paper comprises a coloured, preferably black, cellulose containing paper or rag paper. By 'rag paper' is meant a paper containing textile. The base paper has a grammage of about 100 g/m² - 300 g/m² and is inked with a coloured pigment, the origin of which may be either synthetic or organic, which makes the paper opaque. To attain an opaque paper, the base paper should be inked with a pigment, which both absorbs most of the incident light rays and especially is light-scattering. According to the invention, by opaque is meant totally opaque, i.e. it is impossible to see through the base paper even under intensive light. For example, the opacity of the base paper is non-measurable by conventional opacity measurement methods for paper, such as SCAN-P8. The base paper is preferably inked with a black pigment, such as carbon black. The coloured paper is coated on both sides with a bright coating composition, which makes the surface of the paper suitable for printing, meaning that the paper may be printed using conventional printing techniques, such as ordinary offset printing and/or screen printing. The coating according to the invention is thin, however, compared to conventional coated paper represents a relatively thick coating. The base paper is preferably coated with the coating composition to a grammage of the coating of between 10 g dry solid matter/m² of coated side and 30 g dry solid matter/m² of coated side, preferably 20 g - 30 g and especially 20 g - 25 g solid matter/m² of coated paper side. Pigments which may be used in the coating composition are preferably bright, non-fluorescent pigments, especially titanium dioxide or similar white pigments. Since the coating composition is preferably non-fluorescent, it is possible, when required, to use UV-fluorescent inks for the subsequent printing of the paper. By means of UV-fluorescent printing inks, it is easy to check the genuineness of the lottery tickets. The filler is usually clay, kaolin, or other conventional filler used in the coating of paper. The binder may be, for example, latex, starch, or casein in a water-based solution. Alternatively, the binder solution may be a hot melt plastic. For reasons of security, the lottery ticket paper may also comprise fibres which are visible or non-visible in daylight, or a combination thereof. Preferably, the fibres are UV-fluorescent fibres. The fibres may be included in the coating composition or laminated between the base paper and the coating. Fibres suitable for use in the lottery ticket paper according to the invention are fibres of synthetic or regenerated origin, e.g. polyamide, polyester or rayon fibres. Suitable fibres have a length of about 2 - 10 mm and preferably about 4 - 5 mm and a diameter of about 3 - 10 Dtex. A suitable amount of fibres in the coating is about 50 - 250 fibres/dm². Further, the coating composition may contain a further security element such as one or more so called security chemicals, which make the coating unique and protect the lottery ticket paper as well as the products produced against possible forgery such as by erasure or alteration of the printed paper. Security chemicals to be mentioned are, for example, Securistain, Clorostain, Solvent Black and Nitrofast Blue (trademarks). These chemicals indicate visibly attempts at forgery and/or tampering. The chemicals are added in amounts which are sufficient to indicate such attempts. Suitable quantities of said chemicals are equivalent to an amount in the fully converted paper of around 80 l/ton of paper. It is true that it is previously known to add various security elements to paper pulp used for the manufacture of security paper for various types of security print. It is, however, not previously known to include security elements in a coating intended for security print. It is therefore surprising and unexpected that according to the present invention there is provided a base paper coated on both sides, which without objections is usable for the manufacture of lottery tickets and which from the security point of view fulfills the special requirements as regards products of this kind. In an alternative embodiment of the invention, the base paper may be fusion coated, for example flow coated with hot melt plastic instead of being coated with a water-based coating mixture. The lottery ticket paper according to the invention may be used for the manufacture of so called instant lottery tickets. The lottery ticket paper is printed on both sides with conventional printing inks or UV-fluorescent inks. One side of each ticket is printed with a figure combination which is unique for each lottery ticket. On the back of said ticket there is printed general information about the lottery in question, which information is the same on all tickets. The unique figure combination on the ticket is then covered with a coating comprising a conventional coloured latex solution. Such suitable latex solutions are well known and have been used, for example, on the conventional instant lottery tickets produced from foil-laminated paper material. After buying a ticket, the buyer rubs off the latex coating and is able to see directly whether he has won. The invention will now be described in more detail by means of the following non-limiting examples. Example 1 : Lottery ticket paper was prepared by applying a coating of around 20 g dry solid matter/m² and side of base paper to both sides of a base paper having a grammage of 225 g/m², inked with carbon black, which had been added to the stock preparation during the manufacture of the paper. The coating mixture comprised a water dispersion of clay, titanium dioxide, latex and optionally viscosity regulating agents. The coating mixture was applied on both sides of the base paper by conventional methods, which are well known to a person skilled in the art. The coated paper was then dried and glazed in the conventional way in the drying section of the machine. Example 2 : Lottery ticket paper was prepared as described in Example 1, except that the coating composition further comprised the security chemicals Securistain, Clorostain, Solvent Black and Nitrofast Blue (trademarks) in an amount of 80l/ton of paper. Example 3 : Lottery ticket paper was prepared as described in Example 1, except that the coating composition further comprised polyamide fibres in an amount of about 125 fibres/dm² of paper. The products produced in accordance with Examples 1-3 have a uniform, even, white surface on both sides. The coatings may be printed with conventional printing inks and conventional printing equipment. The coated base papers produced in accordance with Examples 1-3 cannot be delaminated, since the coatings consist of a deposited composition originating from various powdered components. Example 4 : A lottery ticket, so called instant lottery ticket, was prepared using a lottery ticket paper produced in accordance with Example 1. The ticket paper was printed on both sides with conventional inks intended for offset printing. Alternatively, UV-fluorescent inks may be used. One side of the lottery ticket paper was printed in an offset machine with figure combinations which were unique of each lottery ticket. The back of the paper was provided with suitable printed information which was the same on all lottery tickets and which was related to the lottery in question. The figure combination of the lottery ticket was then covered by coating with a coloured latex solution. The lottery ticket was tested by the National Swedish Laboratory of Forensic Science, Linköping, Sweden, and was found to fulfill the requirements for see-through protection and tamperproofness. The products produced are machine countable. They are nonexpensive to manufacture and have a relatively low weight, so that mailing expenses will be low. They are suitable to the environment and are easily destroyed in connection with refuse disposal. This means that, like ordinary printing paper, the lottery ticket paper may easily be recycled.

Claims: The use of a coated paper for the manufacture of instant lottery tickets wherein the paper comprising a coloured and totally opaque base paper and a coating composition on both sides of said base paper giving the paper suitable printing surfaces, said composition comprising at least one pigment, a filler, a binder solution, and optionally viscosity regulating agents. The use of a paper according to claim 1, characterized in that the paper is coated with said coating composit'ion to a substance equivalent to 10 g - 30 g, preferably 20 g - 30 g, dry solid matter/m² of coated side. The use of a paper according to claims 1 or 2, characterized in that the paper is coated with a coating composition further comprising security elements, such as security chemicals, visible or non-visible fibres or a combination thereof. The use of a paper according to any of claims 1 - 3, characterized in that the the paper is coated with a non-fluorescent composition. The use of a paper according to any of claims 1 - 4, characterized in that the base paper is dyed with a light-scattering pigment, preferably a black pigment, such as carbon black and that the pigment of the coating composition is a white pigment such as titanium dioxide.

Inventors: HANSELL, ERIK
Applicants: AB TUMBA BRUK
Application year: 1990
Main classification: D21H21
IPC codes: D21H21