Security paper diversity

In the field of anti-counterfeit printing, paper security is topped. At present, the commonly used anti-counterfeiting printing papers mainly include the following types, and they all have special anti-counterfeiting features.

Watermarking paper

It is paper with embossed, touchable images, barcodes, etc. Banknotes use watermark anti-counterfeiting technology. Since watermarks cannot be reproduced by photocopiers, scanners, etc., their anti-counterfeiting effects are highly valued. Today, the scope of application of watermarking has been extended to documents of value, documents, and even books. In the papermaking process, watermarks are used to apply the required marks, patterns, etc. to the paper, such as installing a pre-designed watermarking printing plate on the screen, or pressing it with a printing roller. Due to different graphic levels, the paper pulp has different thicknesses and corresponding densities. After the paper is formed, the density of the paper pulp is different due to the different density of the paper pulp. Therefore, when the light is observed, the original graphic design can be displayed.

There are three types of watermarks: fixed watermark, semi-fixed watermark, and non-fixed watermark. The fixed watermark printing process is difficult and must be fixed at certain positions such as banknotes, certificates, certificates, and the like, and it is usually matched with the naked eye visible printing graphics or other anti-counterfeiting measures. The distance and position between each set of watermarks of semi-fixed watermarks are fixed, and each group is continuously arranged on the paper, so it is also called continuous watermark, and it is often used for special paper. Unfixed watermarks are distributed on paper or on the full surface of the ticket, so they are also called full-page watermarks.

Anti-counterfeiting watermark paper has been developed from the original long web paper to today's highly secure long web paper. Its features include:

1) up to 15 gray levels, so there are more levels; black watermark area thickness can reach 40μ, thicker than the average thickness of 15-20μ paper, it has a good contrast; and better Details and watermark clarity.

2) Additional safety measures such as safety lines, etc., which are not available on the long web of paper. Add long cotton fibers to wood pulp to increase paper life. In the rotary screen paper machine, the watermark is formed on the surface of the watermark through the pile of fibers, and the watermark and the watermark are formed at the same time, which means that the watermark can be filled into the circular screen to form a very clear watermark.

With the development of electronic technology, electronic watermarking paper was introduced. A system called “microbar” uses chaos theory to encode data into a document background. This “microbar” is invisible to the naked eye but can be read with a scanner and cracked its password. Only the original plate can be printed, and any precision printing device can not be copied or can only print out some unclear images.

Security line with security paper

Refers to a gold or plastic line placed in the middle of the paper during papermaking. The earliest use was made of special metal wires. Polyester plastic wires, miniature letter security wires, and fluorescent security wires are now used. The shape of the safety line is straight, wavy, zigzag, and the like. According to the relevant information, the new version of the US banknote not only buries metal wires in the paper, but also narrows down the text that can only be read with high-magnification magnifying glass. In recent years, it has also introduced a heat-sensitive security cord that is pink at room temperature and opaque. When the temperature is raised to 37 degrees Celsius with a finger, the microtext will appear locally. There is also a kind of security line - laser holographic security line due to different viewing angles and produce color changes.

Put a security thread in the paper. The width of the thread can be as small as 1mm. If you put more than one security thread at the same time, the thread spacing can be as small as 4mm. The pattern and text required by the user can be printed on the security line. According to the different difficulty requirements for security, the printed pattern and text can be made into hollow or non-hollowed.

The security line in the printing of banknotes is also the focus of research in various countries. For example, the United Kingdom adopts a window-type transmission safety line, France develops a safety line for some aluminum plating processes, France develops a safety line for some aluminum plating processes, and Finland uses fluorescent safety lines, etc. . Biochemical security marks are a major breakthrough in the development of anti-counterfeiting technology. Recently, the research on foreign biological research machinery has been successfully developed. It is mainly printed on adhesive labels to achieve anti-counterfeiting purposes. Digital distortion anti-counterfeiting technology has also been applied in foreign countries. This technology is applicable to any print that requires Arabic numerals. The deformation is implemented by computers. No rules can be followed. The recognition is also through computers.

Laser anti-counterfeiting technology combined with paper made security paper. If holographic anti-counterfeiting technology and special equipment are used, the holographic image will be produced at a specific position of the banknote and the anti-counterfeiting performance will be improved. The features are as follows:

1) Since the holographic pattern is directly formed on the paper and the plastic information layer is removed, there is little possibility of being copied;

2) The pattern on the paper can be designed, plated, produced according to the requirements of merchants, different textures, grams of paper (70-400 grams), such as coated paper, cardboard, cardboard, and can also be like ordinary paper. Offset printing, screen printing, etc.;

3) The price is only slightly more expensive than ordinary compound gold and silver cardboard, equivalent to the price of a holographic anti-counterfeiting trademark, and eliminating the need for labeling labor costs, so it is easily accepted by merchants;

4) After being abandoned, it can be weathered in the soil and will not pollute the environment.

At present, laser anti-counterfeiting papers have played a role in the packaging and printing of certain cigarettes, wines, cosmetics, and foods. For example: Shengli Oilfield Aluminum Foil Composite Material Factory produced a non-film holographic dark security printing wrapping paper. It has pre-press and post-print full-size anti-counterfeiting. The whole paper surface can be designed and produced with special edition or ordinary version of laser anti-counterfeiting image with a width of 800 mm or more. The design uses an implied design, and even with multi-layered ink coverage, it is still visible, and the effect of light refraction is excellent without affecting the design and printing theme.

Red blue fiber paper, colorful dot encrypted paper

Colored fibers such as red and blue or colored pieces (dots) are incorporated into the pulp, or sprinkled on the surface of the paper before the paper is unfixed, and are fluorescently reflected under the irradiation of ultraviolet rays so that the formed paper has colored fibers that are different from the paper itself. The red and blue fiber yarns and color dots incorporated into the pulp include two kinds of colored fibers and colorless fluorescent fibers. The former can be seen with the naked eye on the surface of the paper, and the latter and the color point must be visible under the ultraviolet irradiation. The colors are red, blue, orange, etc. The shape can be thick or thin and can be long or short. Fibers and colored dots are generally randomly distributed, so their density is different. In addition to plant fibers, in recent years there has been the use of metal foil, plastic small round plate incorporated into the pulp anti-counterfeiting. For instance, the Italian banknotes have a metal foil that is not visible to the naked eye and sounds when examined with a special identifier. In addition, the British study used a special fiber to spread a small piece, then use a specific light source to illuminate from a specific angle, get a stereoscopic projection, and store it in a computer, and then verify the authenticity by examining the projection of the mark.

Anti-copy paper

One is a full-absorption copy-proof paper, which is blue and reddish-brown. The paper on the paper can only be seen through light, and its copy is dark. However, such paper is not convenient for daily use. The other is to coat the surface of the paper with a thin layer of aluminum (but without affecting the printing). Because the aluminum protective layer can disperse or deflect the light of the photocopier, the copy is black. Some anti-copying paper copies will appear "copy" and "invalid" and other words, can effectively prevent color copy of important documents. In addition, there is also anti-copying paper that changes color or reveals hidden text as soon as it encounters the photocopier.

Paper with trace amounts of additives

Using the principle that organisms have an anti-no-antibody specific reaction, a very small amount of anti-elements is added to a certain part of pulp or paper. When detecting, it is combined with the corresponding specific antibody, and the presence or absence of special reaction is marked by coloration, fluorescence, etc., and the authenticity is discriminated.

Chemical Encryption Paper

Special compounds are added to the pulp when it is added to the pulp or when the surface of the paper is sized. The chemically-encrypted paper can develop color or show fluorescence when coated with a specific chemical reagent. A type of foreign ball game ticket is printed on this type of paper. When checking, just use a pen impregnated with a special reagent and draw a dot on the target surface.

Ionic media special security paper

The large-scale heavy ion accelerators that are controlled by the leading countries, the special anti-counterfeit papers that incorporate ion micropore technology and papermaking technology into super energy ion media solve the problems of long-frustrated effective document anti-counterfeiting and identification difficulties.