A kind of anti-fake laser single plate fine plate and plate roller

Abstract

The utility model relates to a kind of anti-fake laser single edition fine edition jointing roller, including edition roller body, mould pressing work edition and two rotary joints, two rotary joints are respectively arranged in the left and right ends of edition roller body, mould pressing heating runner is arranged in edition roller body inside, the middle part outer circumferential surface of edition roller body is equipped with annular groove extending along its outer circumferential direction, mould pressing work edition is rolled and pasted in annular groove, edition joint is formed between the two ends of mould pressing work edition;Edition roller body inside is also equipped with edition joint heating runner, the inner diameter of the middle part of edition joint heating runner is greater than the inner diameter of its two side positions;The depth of the area part of annular groove close to edition joint is less than the depth of other part of annular groove, so that the part of mould pressing work edition close to edition joint and the left and right side parts of annular groove form groove.The utility model can effectively inhibit even eliminate visual bright line defect generated due to edition joint edge damage coating while ensuring to adopt single edition holographic mould pressing to realize high anti-fake, to improve its anti-fake printing effect.

Description

Technical Field

[0001] This utility model relates to the field of printing anti-counterfeiting technology, specifically to an anti-counterfeiting laser single-plate fine-plate slit roller. Background Technology

[0002] In the packaging of high-value-added goods, such as tobacco, alcohol, and high-end cosmetics, holographic laser paper is widely used due to its stunning visual effects and excellent anti-counterfeiting potential. To enhance product visual distinctiveness and anti-counterfeiting security, the industry typically employs various printing methods, including offset printing, flexographic printing, screen printing, and gravure printing. Among these, gravure printing holds a significant position due to its rich ink coverage, abundant tonal range, and suitability for high-speed, large-area printing. Gravure printing is generally suitable for printing on paper without seams, such as white cardstock, gold and silver cardstock, and seamless laser paper. However, these types of paper share a common characteristic: the surface information is highly consistent, making them easy to counterfeit and thus failing to achieve a truly effective anti-counterfeiting measure.

[0003] In recent years, some companies have combined custom-designed holographic anti-counterfeiting technology with gravure printing to improve the anti-counterfeiting performance of their products. To ensure the integrity of the custom-designed holographic information, the embossing of custom-designed holographic images must be achieved using single-plate laser holographic embossing. The primary problem to be solved in single-plate holographic embossing is the alignment of the holographic nickel plate seams. Conventional embossing rollers, when rolling up the holographic nickel plate, produce 0.2-0.3mm seams. Furthermore, due to damage to the coating caused by the nickel plate seam edges, noticeable bright lines appear at the seams, further widening the seam width. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide an anti-counterfeiting laser single-plate fine-seam printing roller. This anti-counterfeiting laser single-plate fine-seam printing roller can effectively suppress or even eliminate visual bright line defects caused by damage to the coating at the edge of the printing seam while ensuring high anti-counterfeiting performance through single-plate holographic molding, thereby improving its anti-counterfeiting printing effect. The technical solution adopted is as follows:

[0005] A type of anti-counterfeiting laser single-plate fine-seam printing roller includes a roller body, a molding working plate, and two rotary joints. The two rotary joints are respectively located at the left and right ends of the roller body. A molding heating channel is provided inside the roller body. An annular groove extending circumferentially is provided on the outer circumferential surface of the middle part of the roller body. The molding working plate is rolled into the annular groove, and a seam is formed between the two ends of the molding working plate. The roller body is characterized by having a seam heating channel inside, located between the molding heating channel and the seam. The inner diameter of the middle part of the seam heating channel is larger than the inner diameter of its two sides. The depth of the annular groove near the seam is smaller than the depth of other parts of the annular groove, so that the part of the molding working plate near the seam forms a groove with the left and right sides of the annular groove.

[0006] Typically, the bottom of the groove is an arc surface, and its position is slightly lower than the outer peripheral surface of the two sides of the printing roller. Except for the printing seam, the other parts of the molding work plate are flush with the outer peripheral surface of the two sides of the printing roller.

[0007] When manufacturing the aforementioned anti-counterfeiting laser single-plate fine-seam printing roller, the molding heating channel and the seam heating channel are first processed inside the roller body. Then, a heating medium supply device (such as an oil heater) introduces a heating medium (such as heating oil) at 180-190℃ into the seam heating channel through the heating medium inlet until the surface temperature of the middle part of the seam heating channel reaches 150-160℃, and the surface temperature of its two sides reaches 110-120℃ (because the inner diameter of the middle part of the seam heating channel is larger than the inner diameter of its two sides, the surface temperature of the middle part of the seam heating channel can be increased). (The temperature is higher than the surface temperature on both sides), and then the heating medium inlet is sealed with a sealing plug; then, a lathe is used to machine the entire outer surface of the middle part of the roller body to form an annular groove; then, after the roller body has completely cooled down, the sealing plug is opened to clean out the heating medium in the printing plate heating channel, and then the printing plate heating channel is sealed again, and the roller body is electroplated to complete the processing of the roller body; finally, the molding work plate is rolled and pasted into the annular groove of the roller body, so that the printing plate seam formed between the two ends of the molding work plate is aligned with the printing plate heating channel, thus producing the anti-counterfeiting laser single-plate fine printing plate roller. After the heating medium is introduced into the heating channel of the printing plate seam, based on the principle of thermal expansion and contraction, the thermal expansion coefficient of the area of ​​the printing plate roll body near the heating channel of the printing plate seam is much greater than that of other areas. This causes the area of ​​the printing plate roll body near the heating channel of the printing plate seam to bulge outward. Therefore, when the surface of the printing plate roll body is machined on a lathe to form an annular groove, the machined portion of the area of ​​the printing plate roll body near the heating channel of the printing plate seam is larger than that of other areas. When the printing plate seam cools to room temperature, the depth of the area of ​​the annular groove near the heating channel of the printing plate seam is less than the depth of other parts of the annular groove. As a result, after the molding work plate is rolled into the annular groove, the part of the molding work plate near the printing plate seam and the left and right sides of the annular groove form a groove. Furthermore, when using a printing roller for holographic molding, a heating medium can be introduced into the molding heating channel, while no heating medium is introduced into the seam heating channel. Since the diameter of the central region of the seam heating channel is larger than the diameters on its sides, the temperature of the heat-conducting oil transferred from the molding heating channel to the central region of the seam heating channel is lower than the temperature on the sides. This allows the depth of the part of the molding work plate near the seam (i.e., the groove) to be further increased. Because the depth of the annular groove near the seam is less than the depth of other parts of the annular groove, after the molding work plate is rolled and pasted into the annular groove, the part of the molding work plate near the seam and the left and right sides of the annular groove can form a groove (the seam is located on this groove).When using a printing roller for holographic molding, a heating medium (such as heating oil at 180-190℃) can be introduced into the molding heating channel. Since the part of the molding work plate near the plate seam (i.e., the groove) is lower than the outer periphery of the two sides of the printing roller body, the pressure of the molding roller on the groove area is less than the pressure outside the groove area. This reduces the damage to the coating caused by the edge of the plate seam of the molding work plate. As a result, it can be ensured that while using single-plate holographic molding to achieve high anti-counterfeiting, it can effectively suppress or even eliminate visual bright line defects caused by damage to the coating caused by the edge of the plate seam.

[0008] As a preferred embodiment of this utility model, the diameter of the middle part of the printing plate seam heating channel is 25-30mm, and the inner diameter of the two sides of the printing plate seam heating channel is 10-20mm.

[0009] As a preferred embodiment of this utility model, at least one end face of the printing roller body is provided with a heating medium inlet that communicates with the printing plate seam heating channel, and the heating medium inlet is detachably fitted with a sealing plug.

[0010] As a preferred embodiment of this utility model, the two sides of the printing roller body are provided with marking lines parallel to their axis, and the marking lines correspond to the positions of the printing seam heating channels; the printing seam is directly opposite the marking lines. Therefore, when the molding work plate is rolled onto the roller surface of the printing roller body, the printing seam formed between the two ends of the molding work plate is directly opposite the marking lines, thereby making the alignment of the printing seam and the printing seam heating channels simpler and more accurate.

[0011] As a preferred embodiment of this utility model, the molding working plate is a holographic nickel plate. Specifically, the width of the seam after the holographic nickel plate is rolled up is 0.05-0.10mm, and the graphics on both sides of the seam are complete images. The circumferential cutting line of the holographic nickel plate is located near the center line between the two special pattern plates.

[0012] As a preferred embodiment of this utility model, the rotary joint adopts a connecting shaft, and the first end of the connecting shaft is coaxially connected to the end face of the printing roller body.

[0013] As a preferred embodiment of this utility model, in the axial direction of the printing roller body, the width of the molding working plate is less than or equal to the width of the groove.

[0014] Compared with the prior art, this utility model has the following advantages:

[0015] This anti-counterfeiting laser single-plate fine-seam printing roller incorporates a heating channel inside the roller body, wider in the middle and narrower at both ends, for introducing a heating medium. Based on the principle of thermal expansion and contraction, during roller manufacturing, the depth of the area near the seam of the annular groove is made less than the depth of other parts of the annular groove. This allows the molding plate, after being rolled into the annular groove, to form a groove with the left and right sides of the annular groove (the seam lies within this groove). When using the roller for holographic molding, the pressure on this grooved area from the molding roller is less than the pressure outside the groove, thus reducing damage to the coating from the seam edges of the molding plate. This ensures high anti-counterfeiting performance using single-plate holographic molding while effectively suppressing or even eliminating visual bright line defects caused by seam edge damage to the coating. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the anti-counterfeiting laser single-plate fine-plate seam roller of a preferred embodiment of the present invention.

[0017] Figure 2 yes Figure 1 AA sectional view. Detailed Implementation

[0018] like Figures 1-2 As shown, this anti-counterfeiting laser single-plate fine-seam printing roller includes a printing roller body 1, a molding working plate 2, and two connecting shafts 3. The two connecting shafts 3 are coaxially connected to the left and right ends of the printing roller body 1, respectively. A molding heating flow channel 10 is provided inside the printing roller body 1. An annular groove 11 extending along its outer circumference is provided on the outer circumferential surface of the middle part of the printing roller body 1. The molding working plate 2 is rolled into the annular groove 11, and a printing seam 20 is formed between the two ends of the molding working plate 2. The depth of the annular groove 11 near the printing seam 20 is less than the depth of other parts of the annular groove 11, so that the part of the molding working plate 2 near the printing seam 20 and the left and right sides of the annular groove 11 form a groove 21.

[0019] In this embodiment, the bottom of the groove 21 is an arc surface, and its position is slightly lower than the outer peripheral surface of the two sides of the printing roller 1. Except for the printing seam 20, the other parts of the molding working plate 2 are flush with the outer peripheral surface of the two sides of the printing roller 1.

[0020] In this embodiment, the printing roller body 1 is also provided with a printing seam heating channel 12. The printing seam heating channel 12 is located between the molding heating channel 10 and the printing seam 20. The inner diameter of the middle part of the printing seam heating channel 12 is larger than the inner diameter of the two sides. The diameter of the middle part of the printing seam heating channel 12 is 25-30mm, and the inner diameter of the two sides of the printing seam heating channel 12 is 10-20mm.

[0021] In this embodiment, a heating medium inlet communicating with the printing plate seam heating channel 12 is provided on at least one end face of the printing roller body 1, and a sealing plug 13 is detachably installed on the heating medium inlet.

[0022] In this embodiment, marking lines 14 parallel to their axes are provided on the surfaces of both sides of the printing roller 1, and the marking lines 14 correspond to the positions of the printing plate seam heating channel 12; the printing plate seam 20 is directly opposite the marking lines 14. Thus, when the molding working plate 2 is rolled onto the roller surface of the printing roller 1, the printing plate seam 20 formed between the two ends of the molding working plate 2 is directly opposite the marking lines 14, thereby making the alignment of the printing plate seam 20 with the printing plate seam heating channel 12 simpler and more accurate.

[0023] In this embodiment, the molding work plate 2 is a holographic nickel plate. After the holographic nickel plate is rolled up, the width of the plate seam 20 is 0.05-0.10mm, and the graphics on both sides of the plate seam 20 are complete graphics (not shown in the figure). The circumferential cutting line of the holographic nickel plate is located near the center line between the two special plate patterns.

[0024] In this embodiment, the width of the molding work plate 2 is equal to the width of the groove 21 along the axial direction of the printing roller 1.

[0025] The following is a brief description of the manufacturing method of this anti-counterfeiting laser single-plate fine-seam roller:

[0026] When manufacturing the aforementioned anti-counterfeiting laser single-plate fine-seam printing roller, the molding heating channel 10 and the seam heating channel 12 are first machined inside the roller body 1. Then, an oil heater introduces heating oil at 180-190℃ into the seam heating channel 12 through a heating medium inlet until the surface temperature of the middle part of the seam heating channel 12 reaches 150-160℃, and the surface temperature of its two sides reaches 110-120℃ (because the inner diameter of the middle part of the seam heating channel 12 is larger than the inner diameter of its two sides, the surface temperature of the middle part of the seam heating channel 12 can be higher than the surface temperature of its two sides). Then... The sealing plug 13 seals the heating medium inlet. Then, a lathe is used to machine the entire outer surface of the middle part of the printing roller 1 to form an annular groove 11. After the printing roller has completely cooled down, the sealing plug 13 is opened to clean out the heating oil in the printing plate heating channel 12. The printing plate heating channel 12 is then sealed, and the printing roller 1 is electroplated to complete the processing of the printing roller 1. Finally, the molding work plate 2 is rolled and attached to the annular groove 11 of the printing roller 1, so that the printing plate slit 20 formed between the two ends of the molding work plate 2 is aligned with the printing plate heating channel 12, thus obtaining the anti-counterfeiting laser single-plate fine-slit printing roller.

[0027] In the above manufacturing process, after heating oil is introduced into the heating channel 12 of the printing plate seam, based on the principle of thermal expansion and contraction, since the coefficient of thermal expansion of the area of ​​the printing roller 1 near the heating channel 12 of the printing plate seam is much greater than that of other areas, the area of ​​the printing roller 1 near the heating channel 12 of the printing plate seam can bulge outward. Therefore, when the surface of the printing roller 1 is machined to form the annular groove 11 by a lathe, the machined part of the area of ​​the printing roller 1 near the heating channel 12 of the printing plate seam is larger than that of other areas. When the printing plate seam 20 cools to room temperature, the depth of the area of ​​the annular groove 11 near the heating channel 12 of the printing plate seam can be less than the depth of other parts of the annular groove 11. Thus, after the molding work plate 2 is rolled into the annular groove 11, the part of the molding work plate 2 near the printing plate seam 20 and the left and right sides of the annular groove 11 form a groove 21.

[0028] In addition, when using a printing roller for holographic molding, heating oil can be introduced into the molding heating channel 10, while heating oil is not introduced into the printing seam heating channel 12. Since the diameter of the middle region of the printing seam heating channel 12 is larger than the diameter of its two sides, the temperature of the heat-conducting oil in the molding heating channel 10 transferred to the middle region of the printing seam heating channel 12 is lower than the temperature on both sides of the printing seam heating channel 12. As a result, the depth of the part of the molding work plate 2 near the printing seam 20 (i.e., the groove 21) will be further increased.

[0029] Furthermore, it should be noted that the names of the various parts of the specific embodiments described in this specification may differ. All equivalent or simple variations made to the structure, features, and principles of this utility model patent are included within the protection scope of this utility model patent. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not deviate from the structure of this utility model or exceed the scope defined by the claims, they should all fall within the protection scope of this utility model.

Claims

1. A type of anti-counterfeiting laser single-plate fine-seam printing roller, comprising a roller body, a molding working plate, and two rotary joints, the two rotary joints being respectively disposed at the left and right ends of the roller body, a molding heating channel being disposed inside the roller body, and an annular groove extending circumferentially along the outer periphery of the middle part of the roller body being provided, the molding working plate being rolled into the annular groove, and a seam being formed between the two ends of the molding working plate; characterized in that: The printing roller body is also provided with a printing seam heating channel, which is located between the molding heating channel and the printing seam. The inner diameter of the middle part of the printing seam heating channel is larger than the inner diameter of its two sides. The depth of the annular groove near the printing seam is smaller than the depth of other parts of the annular groove, so that the part of the molding working plate near the printing seam and the left and right sides of the annular groove form a groove.

2. The anti-counterfeiting laser single-plate fine-plate sewing roller according to claim 1, characterized in that: At least one end face of the printing roller body is provided with a heating medium inlet that communicates with the printing plate seam heating channel, and the heating medium inlet is detachably fitted with a sealing plug.

3. The anti-counterfeiting laser single-plate fine-plate seam roller according to claim 1, characterized in that: The diameter of the middle part of the heating channel is 25-30mm, and the inner diameter of the two sides of the heating channel is 10-20mm.

4. The anti-counterfeiting laser single-plate fine-plate sewing roller according to claim 1, characterized in that: The two sides of the printing roller are marked with lines parallel to its axis, and the marking lines correspond to the position of the printing seam heating channel; the printing seam is directly opposite the marking lines.

5. A counterfeit-proof laser single-plate fine-seam roller according to any one of claims 1-4, characterized in that: The molding workpiece is made of holographic nickel plate.

6. A counterfeit-proof laser single-plate fine-seam roller according to any one of claims 1-4, characterized in that: The rotary joint uses a connecting shaft, and the first end of the connecting shaft is coaxially connected to the corresponding end face of the printing roller.

7. A counterfeit-proof laser single-plate fine-plate seam roller according to any one of claims 1-4, characterized in that: Along the axial direction of the printing roller, the width of the molding working plate is less than or equal to the width of the groove.

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