Ticket paper recognition

The ticket is a valuable and authoritative paper product. Therefore, the paper used to print the ticket must be of high quality, so that the holder has a sense of value for it and can not put it down. Therefore, it is not normal paper that can be used for printing. Make it.

First, the characteristics and structure of the ticket paper

The main physical characteristics of the ticket paper are durability, folding resistance, tear resistance, smooth surface, easy writing, and a sense of value. It is made of long fiber pulp such as flax, ramie, manila hemp, cotton, trifoliate, and frigid forest.

However, the main components of the paper for the ticket should be 50% cloth fiber and 50% wood fiber containing special chemical, fully decomposed and mixed.

The paper on which checks are printed, in addition to the above characteristics, should not contain any magnetic material, enabling the heads of the readers to pass smoothly.

The finished product inspection is an important part of the paper. Generally, it is required that the product be subjected to tensile strength, retractability, breakage, folding resistance, thickness, basis weight, hue, chalkiness, pH, smoothness, size, etc. before leaving the factory. Make a detailed record and perform computer analysis to obtain a unified quality.

The chemical property of the paper for the ticket is to prevent it from being altered. There is one or more chemical agents penetrating the paper. When certain solvents or decolorizers are used, the surface of the paper will be automatically discolored, making the changer unable to successfully Change the contents of the ticket.

In addition, the security management of ticket paper mills is also very important. The control of waste and residual materials must be very strict, and irrelevant personnel are not allowed to enter the paper mills. It is also necessary to properly control the sorting, packaging and quantity of paper. Ensure the safety of raw materials.

Second, paper anti-counterfeiting measures

Since no ticket is 100% safe, the more comprehensive it is, the better it is to consider the security. Generally, it starts with the use of paper and printing methods.

There are many kinds of anti-counterfeiting features of paper, which can be used in a specific way depending on the type of ticket. Therefore, when ordering paper, it is necessary to prescribe some sort or multiple defense features. Of course, the price is much more expensive than the normal paper. Anti-counterfeiting measures are described below for reference.

(a) Watermarking

It is the easiest way to identify with the naked eye. The watermark is created by paper mills using engraving watermarked watermark rolls to press on paper. The lines are mostly customized, representing a company's special watermark in order to protect the company's printed tickets will not be counterfeit or counterfeit. In order to protect their specific users, paper mills cannot be used to make paper for other specific objects. Therefore, this measure will also increase the manufacturing cost of paper.

Watermarks can be divided into three types:

1. The electronic watermarking pattern is shallower than the surrounding of the paper, and is usually cheaper than embossing, but it is easy to be forged.
2. Embossed enamel floating watermark lines are deeper than the surrounding of the paper and are less likely to reproduce the same pattern, usually at higher prices.
3. The integrated and integrated two methods can get the clearest contrast, the least easy to copy, and the highest price.

If the paper mill is asked to use the third method to make watermarks on paper, printing paper tickets will be one of the safest defense measures.

(b) Visible fiber filaments

Usually when ordering paper, the paper mill may be required to add visible fiber yarns to the paper, typically 3mm-11mm rayon, nylon or silk, and the length may also be specified for identification. The color is usually divided into blue, red, and green, and other colors can also be specified. It can be fully infiltrated or partially banded, depending on the application.

(c) Invisible fiber filaments

This kind of wire cannot be seen with the naked eye. It must be irradiated with ultraviolet fluorescent light on the surface of the paper. It can be seen by reflecting the special color of the fiber after reacting with the fluorescent light. Usually there are red, green and blue colors. Special colors can also be purchased. Fiber length can be specified.

(d) Chemical reactions

It is also one of the commonly used methods to add certain chemical agents on the surface of paper or pulp to strengthen the function of preventing alteration. When the perpetrator wants to tamper with the text on the ticket surface with a bleaching agent or solvent, the paper immediately undergoes a color change reaction, making it impossible to achieve the purpose of alteration. The treated paper should react with the following organic solvents or oxidants:

1. 99.5 % ethane
2. Methanol (wood fines)
3. Ethylene, ethylene glycol, ether
4. Ethyl acetate
5. Acetic acid
6. Acetone (Aciton)
7. Xylene, Benzene, Toluene
8. Trichloroethylene
9. Carbon tetrachloride
10. Methyl ethyl ketones
11. Hydrochloric acid
12. Bleach

(5) Color dots

The dots of very small and different colors are permeated into the pulp. There are two visible and invisible (fluorescent) colors. When mixed in paper, the position is not fixed and the color is yellow. Five kinds of red, blue, green, and purple make imitation of paper more difficult. At the same time, microscopic printing dots can also be selected, and the visible and invisible fiber filaments become very difficult to prevent forgery. But the price is also very expensive.

(6) Raw wood paper

In order to increase sales, many paper mills add fluorescent bleach to the paper pulp, which can make the paper surface bright and white. However, such fluorescent materials may reflect light on ultraviolet light and are therefore not suitable for printing tickets. Paper for printed tickets should be made of natural wood paper that contains no bleach, ie, non-fluorescent bleached paper. When printed with security ink, the fluorescent reaction can be seen with ultraviolet light and the safety effect can be expressed.

(seven) color line, dark line, microscopic printing line

In the papermaking process, the router can be installed on the paper machine, and the color line, dark line or microscopic printing line can be installed. The color line is a 1mm wide colored nylon thread, available in a variety of colors such as black, red, green, and blue. The dark line is invisible to the naked eye. When irradiated with ultraviolet rays, a color line can be seen in the paper, which can enhance the anti-counterfeiting effect.

The microprinting line is printed on the 1mm wide color line or transparent line using a fine printing method. It is not easily recognizable when viewed from a distance, and can be recognized online when viewed with a magnifying glass 10 times or more. Text, sometimes printed with invisible safety lines using security inks, must be inspected with ultraviolet light, and this anti-counterfeiting effect is the highest of the three.

(VIII) Other measures

The ancients said: "The road is one foot high and the height of the devil is high." Although there are many ways to prevent counterfeiting, there are still many unscrupulous practitioners who constantly try. Here are a few other measures:

1. The liquid color identification method uses a certain kind of drug droplets on the paper surface. After waiting for a certain time, the paper will begin to change to a certain color. After a certain time, the color will gradually decrease and decrease. After the syrup is dry, the paper will recover. The original character. There was no sign of traces that had been tested with potions.
2. Soaking water discrimination method: soaking paper in water, through the water refraction can see some special lines in the paper, when the water surface is taken out, but can not see a special kind of paper.
3. Special lens recognition method: When a special lens is placed on a computer-made graphic, you can see the text or number. There are special lines where you can see the text running left or right. If you take this type of lens away, viewing this computer graphic does not make any sense and you cannot recognize the structure. This method has been used on Lotto coupons.

Third, the impact of humidity on paper

Paper is often subject to changes in the humidity level. In the printing plant, there must be perfect temperature and humidity control equipment to stabilize the physical changes of the paper. These physical changes include paper edge wavy, paper bending, wrinkling and easy to break. And so on. The distortion of the paper of the ticket will bring a lot of trouble to the finishing work.

Fourth, the understanding of silk flow

When the paper is being made, the fibers in the pulp are aligned along the direction of the scrim to form a paper with a straight thread. When the paper mill cuts the paper in various sizes, the flow of the paper is often chaotic. In general, there is a direct relationship between the wire flow and the waves. Therefore, the long side of the ticket should be selected as a straight wire paper, which can make the long side relatively straight.

There are many ways to determine the flow of silk. The simplest method is the wet method, which is to wet the paper with one side, or tear one corner and wet one side with the tongue, and then observe the curling of the paper. The axis of the curl is the direction of the flow of the silk. It is also the direction of the fibers. Another method is the long strip method. Cut out any two adjacent sides of the paper with two strips of the same size (about 1" x 5"); hold the sides of the strips by hand, and then visually bend the two strips of paper. The stiff slivers have a forward fiber direction and the curved bar has a transverse direction.

We understand the significance of silk flow. This is important in some situations. For example, if no prior attention is paid to the registration of color printing, there would be a big problem. For color printing, yellow, magenta, cyan, and black colors are accurately overprinted on the paper, and changes in the filament flow will occur. Cause multiple images or blurring and becoming a bad product. In terms of the book and ticket printing, the axis must be parallel to the long edge, so that the book can be easily read, the ticket is more straight, and the arrangement of the internal fibers increases the convenience of the electronic processing of the check.

Fifth, the weight unit of paper

The thickness of paper is usually calculated in terms of "basis weight" or "rear weight". The former is a square.