CN1297410C - Method for making a halftone deformation map of a stamped can - Google Patents

Abstract

A method for manufacturing a half-tone deformation chart of a stamping can mainly comprises the following steps: printing square grid, making reference can, taking the data of deformed grid on the reference can, inputting design draft of can body, making deformed graph, printing deformed graph and punching to obtain can. The method is to apply halftone dot mode to accurately make a deformation graph, and then print the deformation graph on a planar material to be punched, so that the graph can present a final expected normal graph along with the change of the planar material to be punched in the manufacturing process.

Description

Method for making a halftone deformation map of a stamped can

technical field

The invention relates to a method for making a halftone deformed image of a stamped can, which mainly provides high-quality and correct halftone dot color printing for the printed can that needs to be stamped.

Background technique

The most difficult part in the production process of the existing two-piece food printing cans (also known as drawn and redrawn; DRD), such as canned meat and fish on the market, is the production of the deformation map on the can body.

For the production of the deformed figure, the current method is: first scan the original design draft of the bar chart of a tank body into the computer, and then use the computer program to convert it into a circular figure. After completing the above steps, the figure is printed On the material to be punched and formed, punch it into a can shape (such as a common two-piece food printing short can) with a canning machine.

However, due to the behavior of the stamped can body and external process factors, it is difficult to use any mathematical model to simulate the deformation process of the can body as a whole. Therefore, the current practice is to adjust the previous ring-shaped graphic pattern according to the results presented after the first punching of the can, so that the can body will conform to the original manuscript after stamping. After being fine-tuned by the program on the computer, it is printed on the material to be punched and formed, and then inspected after punching and forming; such repeated actions usually take at least three times to obtain a satisfactory result. That is to say, it will take at least a month to make a deformation map, and this also depends on the good cooperation between the printing factory and the canning factory. Therefore, the accuracy, delicacy, time, funds and manpower of the existing methods have become a relatively large burden.

And, for the manufacture mode of the graphic on the long neck cap of the general bottled product, the existing practice at present is to stamp the material to form a white body can, and then coat the graphic or text of solid color on the printing machine in the mode of rolling. The above-mentioned method can only print simple solid-color pictures and texts, and cannot use half-tone (half-tone) color dot printing.

As far as anti-counterfeiting is concerned, modern counterfeiting is becoming more and more rampant, and this counterfeiting phenomenon is a very serious problem especially for high-quality products. So anti-counterfeiting packaging came into being. You may find that many products in the market are protected by anti-counterfeit caps, envelopes or anti-counterfeit labels, and this phenomenon is increasing. This is because today's consumers are very concerned about the authenticity of the products they buy. Products with anti-counterfeiting functions can meet consumers' safety and substantive psychological needs.

In fact, it is absolutely necessary to add anti-counterfeiting functions to products in many industries, such as cosmetics, medicines, health products, clocks and computers.

Since the long-necked caps on the existing wine bottles are all applied with solid-color rolling printing, for some high-priced wines, in order to prevent counterfeiting, an anti-counterfeiting cover is often designed on the bottle body or the outer packaging box. Label.

Also, because the deformation of the long neck cover is very large, it is very difficult to use a computer to directly deform the existing mathematical model in the program to produce a halftone deformation map. Even the barely produced graphics usually have serious moiré’effect, and it is difficult to maintain the moiré’effect used in its original design. This is one of the reasons why there is no good half-tone long-necked cap so far, because the amount of deformation on the long-necked bottle cap is several times that of the two-piece short can of general food.

At the same time, the area where the long-necked cover can be used to express the pattern is very small, so the resolution of the pattern, the accuracy of the dots, and the color tone are not the same as the two-piece short cans of general food, and relatively higher accuracy is required. .

According to statistics, manufacturers all over the world lose at least 200 billion U.S. dollars due to counterfeiting every year. In addition to the widespread use of color printers and copiers, 30% of counterfeit products are printed products, which leads to more and more consumers. It is becoming more and more difficult to distinguish original goods from counterfeits. Any kind of product does not want to be counterfeited by unscrupulous manufacturers, so manufacturers will try every means to prevent counterfeiting, so that consumers can easily distinguish the authenticity from the fake.

Based on the above, in order for consumers to easily distinguish between authenticity and falsehood, the following three basic needs must be met:

1. Consumers can quickly distinguish the authenticity.

2. It is difficult to forge or imitate very much.

3. It should be durable in circulation and not easy to be damaged.

In addition to the above three points, product manufacturers hope to obtain an anti-counterfeiting method with effective anti-counterfeiting effect at a very reasonable price. As far as stamped cans are concerned, graphics and text can be printed on them. If an additional anti-counterfeiting label is required, it will be a big burden on the process and cost. If the flat paper product is directly adopted, it is very likely to be imitated according to the current technology, and ordinary users cannot distinguish the authenticity of the product at all.

Contents of the invention

Therefore, the main object of the present invention is to solve the above-mentioned drawbacks of the prior art. In order to avoid defects, the present invention makes a reference tank from a plane material to be punched with a square grid, and the original square grid deforms with stamping to form a deformed grid on the reference tank. By finding the corresponding equation of the change pattern between the deformed grid on the reference tank and the plane grid of the plane material to be punched, that is, to establish the corresponding change relationship between the deformation map and the grid grid, a result of the deformation before stamping can be obtained. Graphics are required.

Therefore, the cartographer can accurately produce the deformation map; after the iron printing factory prints the deformation map on the flat material to be punched, the figure will show the final expected normal map as the plane to be punched changes during the manufacturing process.

In the process, the change of the flat material to be punched in the process is related to many factors, such as the printing method, the thickness of the color, the material to be punched, the mold, the temperature and method of operation, and so on. So theoretically, every formed cap or can will behave slightly differently, not to mention the result in a different finisher, as the halftone graphic will reflect the metal being flushed The degree of deformation, so the finished products made by different factories can be easily identified. In other words, the accurate dot pattern on the bottle cap or can itself can become an anti-counterfeiting mechanism.

The invention relates to a method for making a halftone deformed image of a stamped tank, which mainly includes: printing a square grid; making a reference tank; acquiring the data of the deformed grid on the reference tank; inputting the design drawing of the tank body; making the deformation Figure; deformation map printing; punching into cans and other steps.

Description of drawings

Fig. 1 is a schematic flow chart of the method of the present invention.

Fig. 2 is a schematic diagram of printing a square grid on a plane material to be punched.

Figure 3 is a schematic diagram of the deformed mesh of the can body.

Detailed ways

The detailed description and technical contents of the present invention are described as follows in conjunction with the accompanying drawings.

Referring to Fig. 1, it is a schematic flow chart of the method of the present invention. As shown in the figure: a method for making a halftone deformation map of a stamped can, comprising the following steps:

a) printing square grid 20: it is a grid diagram (as shown in Figure 2) of printing a square grid 20 of 1 millimeter (1mm) square on a plane material 10 to be punched;

b) Making the reference tank 11: it is the reference tank (not shown in the figure) made of the above-mentioned flat material 10 to be punched through the canning process of the stamping tank to be produced. At this time, the can body 12 of the reference tank will have the above steps Square grid 20 is the deformed grid 21 (as shown in Figure 3 ) of stamping gained, and the square grid 20 at the bottom of the tank is undeformed because it is the same plane;

c) Get the data of the deformed grid 21 in the above steps: get the grid change data attached to the reference tank, select a plurality of intersections as control points 30 at the same time, and use the relative variation between each control point 30 to obtain the reference The corresponding equation of the change pattern between the whole deformed grid 21 of the tank body 12 of the tank and the square grid 20 when the plane material 10 is to be punched is to establish the corresponding change relationship between the deformed figure and the original figure (as shown in Figure 3 Show);

d) Input the design draft of the can body 12: it is to input the design draft of the original strip type, and adjust the correct visibility of the original picture for different graphic display modes, that is, it is necessary to pay attention to its graphic printing on the material 10 to be punched The color difference between pictures and texts in the media;

e) making deformation diagram: the graphical data obtained by the above step d, plus utilizing the corresponding model equation obtained in step c to obtain the applied deformation diagram;

f) Deformation image printing: print the deformation image obtained in step e in a half-tone manner on the flat material 10 to be punched, wherein the deformation image printing can be half-tone (half-tone) of more than four colors Printing (screen printing with less than four colors can also be used);

g) Stamping into cans: Stamping the planar material 10 to be punched with the deformed figure obtained in the above step f into a can.

Wherein, the material 10 to be punched in the above steps is a group of products selected from iron, tin, and tin alloys, or a group of products selected from aluminum and aluminum alloys.

Thus, before the manufacturer stamps the plane material 10 to be punched, the half-tone (half-tone image) screen dot method is used to accurately produce the deformation figure; after the deformation figure is printed on the plane material 10 to be punched, the figure will be The final expected normal map will appear as the planar blanking material 10 undergoes process changes during the process.

In addition, due to the process, the change of the flat material 10 to be punched is related to many factors: such as the printing method, the thickness of the coloring, the material 10 to be punched, the mold, the temperature and method of operation, etc. have a considerable relationship . So theoretically, each formed cap will behave slightly differently, not to mention the result in a different finisher, as the halftone graphic will reflect the degree of deformation of the metal being flushed , so the finished products made by different factories can be easily identified. In other words, the accurate dot pattern presented on the bottle cap itself can be used as an anti-counterfeiting mechanism.

Based on the above, the advantages and effects obtained by the method of the present invention can be divided into two parts to illustrate, namely, food printing cans and wine bottle cap printing:

1. Food printing cans

(1) The deformation diagram does not need to be revised repeatedly: it can be completed once, saving the manufacturer's production time and testing expenses.

(2) The produced products have a high degree of exquisiteness and accuracy in graphics, and there will be no problems such as netting and graphics distortion.

(3) The font on the can body 12 and the barcode will not have inconsistent size: the above-mentioned problems such as no netting and graphic distortion can make the size of the font on the can body and the barcode consistent and clear. In the way of the prior art, the font on the upper half of the tank body 12 may be smaller than the font on the lower half.

(4) It is easy to distinguish whether to adopt the technology of the present invention by the correctness and deformation of the mesh pattern on the can body 12.

2. Wine bottle cap printing

Alcohol products currently on the market are easy to be counterfeited, and the common countermeasures commonly used by wine manufacturers are to add plastic film, laser label, and anti-counterfeiting measures on the outer packaging. These practices seem to have some flaws, so that fake wine is still flooding the market today. The computer-directed deformation method used in general food printing cans cannot be used on wine bottle caps because of its large amount of deformation. The invention can print correct and clear half-tone image dot color graphics on the wine bottle cap. The advantages of the present invention are as follows:

(1) Exquisite graphics: This advantage can be shown especially on long-drawn tanks.

(2) not easy to imitate: because of variable very much in the process of drawing, add the technology of the present invention and nobody has similar practice and technology at present. Unless it is possible to produce similar halftone graphics using exactly the same canning equipment, technology, and related parameters. Therefore, the graphics produced by the present invention are difficult to be copied, and therefore the anti-counterfeit effect can be achieved.

(3) Simplify the manufacturing process: because the manufacturing process of the present invention requires one less coloring process after molding than the traditional can body 12, it can save the cost of product production and the space requirement of the factory building. However, for the entire manufacturing process, this method requires high-quality management and operating conditions. This factor may cause a slight increase in production costs, but relatively, it indirectly improves the quality of the product.

(4) Save production time and manpower: the production time of the present invention saves time and manpower compared with traditional methods.

(5) Improve product quality: The manufacturing process of the present invention requires stricter material quality, operation flow and control, so the product quality will inevitably be improved.

That is to say that the present invention has reached three basic requirements that allow consumers to easily distinguish the true from the false on the anti-counterfeiting effect: namely

1. Consumers can quickly identify the authenticity of the product according to the accuracy of graphic printing and deformation.

2. Generally, it is difficult for counterfeiters to forge or imitate very similarly.

3. In the circulation of the product, it is not only durable, but also will not be damaged or damaged due to external environmental factors, which can ensure that the graphics continue to have the same quality as when they were produced.

Claims (5)

1. the preparation method of the halftoning deformation pattern of a punching press jar is characterized in that this method may further comprise the steps:

A) print square graticule mesh: be the grid chart for the treatment of to go up the square square graticule mesh (20) of printing 1mm on the plane towards material (10);

B) make reference pot: be that above-mentioned plane is treated to form the required reference pot that has warp mesh (21) towards material (10) through punching out;

C) get the data of above-mentioned steps warp mesh: be the grid delta data of getting attached on the reference pot, choose a plurality of crosspoints simultaneously as control point (30), utilize the relative variation between each control point (30), counterparty's formula of the changing pattern when obtaining whole grid of reference pot can body (12) and plane and treating towards material (10);

D) the design picture proof of input can body: be the design picture proof of the former long strip type of input,, adjust the correctly heavy opinion property of former figure at different graphic display modes;

E) make deformation pattern:, add that utilization tries to achieve deformation pattern in the application at the associative mode equation of step c gained by the resulting graphic documentation of above-mentioned steps d;

F) deformation pattern is printed: treat on the plane towards the last deformation pattern with spot function print steps e gained of material (10);

G) punching out becomes jar: the plane that will be printed on deformation pattern treats to strike out jar towards material (10).

2. the preparation method of the halftoning deformation pattern of punching press jar according to claim 1 is characterized in that, this treats that towards material (10) be the group that chosen from Fe, tin and ashbury metal are formed.

3. the preparation method of the halftoning deformation pattern of punching press jar according to claim 1 is characterized in that, this is treated towards material (10) is to be selected from the group that aluminium and aluminium alloy are formed.

4. the preparation method of the halftoning deformation pattern of punching press jar according to claim 1 is characterized in that, this control point (30) number is to decide according to the distortion place number of can body.

5. the preparation method of the halftoning deformation pattern of punching press jar according to claim 1 is characterized in that, this deformation pattern is printed to the halftoning printing of four looks above.

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