A plate cylinder and a method for repairing the same

Abstract

The present application provides a plate roller and its repairing method, relates to the field of printing technology, and solves the technical problems that the patterns, characters and the like on the plate roller are prone to wear and tear and the printing cost is high. The repairing method of the plate roller comprises the following steps: digging a pin hole at the position of the damaged characters or patterns on the plate roller, removing the damaged characters or patterns; inlaying a pin block in the pin hole; milling a to-be-engraved surface on the pin block, so that the to-be-engraved surface is coplanar with the surface on which the remaining characters on the plate roller are located; and re-engraving effective characters or patterns on the pin block. When the patterns, characters and the like on the plate roller are worn or damaged, the above repairing method is used to remove the part where the damaged characters or patterns are located, and the pin block is embedded to re-engrave the characters or patterns. Only the part where the damaged characters or patterns are located is removed and replaced, so that the repairing of the plate roller can be realized, the whole plate roller does not need to be replaced, the service life of the plate roller is prolonged, and the printing cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of printing technology, and in particular to a printing roller and a method for repairing it. Background Technology

[0002] In printing processes, hot stamping often uses a heating method involving oil. The printing roller has a cavity; high-temperature ink is added inside the roller, printing raised lettering or patterns onto it. See also... Figure 1 As shown, when the metal foil passes between the printing roller and the impression roller, it is subjected to pressure and temperature, causing the printed material and the hot stamping foil to be pressed against each other for a short period of time. This transfers the metal foil or pigment foil onto the surface of the printed material according to the image on the printing roller. In formal terms, hot stamping refers to a heat transfer printing process in which electroplated aluminum hot stamping foil (hot stamping paper) is applied to the surface of the substrate under certain temperature and pressure.

[0003] In the prior art, raised lettering or patterns are printed on the printing roller, see [reference]. Figure 2 and Figure 3 As shown, after prolonged use, the text and patterns on the printing roller are prone to wear and scratches.

[0004] The applicant has discovered that the prior art has at least the following technical problems: In the prior art, when the text, patterns, etc. on the printing roller are easily worn or scratched, the printing roller can only be replaced, resulting in a short service life of the printing roller and high printing costs. Summary of the Invention

[0005] The purpose of this invention is to provide a printing roller and its repair method to solve the technical problems of easy wear and tear on patterns and text on printing rollers, and high printing costs in the prior art. The various technical effects of the preferred solutions among the many technical solutions provided by this invention are detailed below.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] The present invention provides a method for repairing printing rollers, the method comprising:

[0008] Make pin holes at the missing text or pattern on the printing roller to remove the missing text or pattern;

[0009] A fixing pin block is embedded in the pin hole;

[0010] The surface to be engraved is milled out on the pin block, so that the surface to be engraved is coplanar with the surface where the remaining text is located on the printing roller;

[0011] Re-engraving of valid text or patterns on the pin block.

[0012] Preferably, before milling the surface to be engraved on the pin block, the thickness of the pin block is greater than the height of the pin hole, and the pin block protrudes from the upper edge of the pin hole.

[0013] Preferably, the fixing pin block embedded in the pin hole includes:

[0014] The pin is inserted into the pin hole, and a positioning element is inserted into the part of the pin that protrudes from the pin hole.

[0015] Preferably, the positioning element is inclined relative to the horizontal plane and protrudes from the surface of the pin block.

[0016] Preferably, the positioning elements are arranged at intervals in the circumferential direction of the pin block.

[0017] Preferably, the re-engraving of effective text or patterns on the pin block includes:

[0018] Based on the spacing and trajectory of the remaining text or patterns on the printing roller, the removed original text or patterns are engraved in the middle of the pin block, or in a position offset from the middle of the pin block.

[0019] The spacing between the re-engraved text or pattern and the original text or pattern on the printing roller is made consistent, and the re-engraved text or pattern and the original text or pattern on the printing roller are located on the same preset line.

[0020] Preferably, the cross-sectional area of ​​the pin hole is larger than the missing text or pattern.

[0021] Preferably, the pin is made of the same material as the printing roller.

[0022] Preferably, the cross-section of the pin hole is square or circular.

[0023] The present invention provides a printing roller, which is repaired using the above-described printing roller repair method.

[0024] Compared with the prior art, the printing roller and its repair method provided by the present invention have the following beneficial effects: when the patterns, texts, etc. on the printing roller are worn or damaged, the above-mentioned repair method is used to remove the part where the damaged text or pattern is located, and a pin is embedded to re-engrave the text or pattern. Only the part where the damaged text or pattern is located needs to be removed and replaced to achieve the repair of the printing roller. There is no need to replace the entire printing roller, which extends the service life of the printing roller and reduces printing costs. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of hot stamping printing in the existing technology;

[0027] Figure 2 This is a schematic diagram of the structure of a printing roller in the prior art;

[0028] Figure 3 yes Figure 2 A magnified view of a section at point A in the middle;

[0029] Figure 4 This is a structural diagram illustrating the process of creating pin holes and removing incomplete text.

[0030] Figure 5 This is a schematic diagram of the pin block being inserted into the pin hole;

[0031] Figure 6 This is a schematic diagram of the fit between the pin block and the pin hole before milling out the area to be engraved;

[0032] Figure 7 This is a schematic diagram of the fit between the pin block and the pin hole after the surface to be engraved is milled out;

[0033] Figure 8 This is a diagram illustrating potential problems that may arise when engraving text on a pin block before it is inserted into the pin hole.

[0034] Figure 9 This is a diagram illustrating two potential problems that may arise when engraving text on a pin block before it is inserted into the pin hole.

[0035] Figure 10 This is a diagram illustrating the engraving of text on a pin block offset from its central position.

[0036] In the diagram: 1. Printing roller; 2. Pin hole; 3. Pin block; 301. Surface to be engraved; 4. Positioning component. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0038] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "center", "length", "width", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "side", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0039] See Figure 2 and Figure 3 As shown, after the plate cylinder is used for a long time, the characters, patterns, etc. on the plate cylinder are prone to wear and scraping. In the prior art, when the characters, patterns, etc. on the plate cylinder are prone to wear and scraping, only the plate cylinder can be replaced, resulting in a short service life of the plate cylinder and high printing costs.

[0040] In view of the above problems, the embodiments of the present invention provide a plate cylinder and a repair method thereof, which do not require replacing the entire plate cylinder, extend the service life of the plate cylinder, and reduce the printing cost.

[0041] The following Figures 3-8 The technical solutions provided by the present invention will be described in more detail.

[0042] Embodiment 1

[0043] As Figures 3-10 shown, this embodiment provides a repair method for a plate cylinder, and the method includes: digging a pin hole 2 at the incomplete characters or patterns on the plate cylinder 1, and removing the incomplete characters or patterns; fixedly embedding a pin block 3 in the pin hole 2; milling a surface to be engraved 301 on the pin block 3 so that the surface to be engraved 301 is coplanar with the surface where the remaining characters on the plate cylinder 1 are located; re-engraving effective characters or patterns on the pin block 3.

[0044] See Figure 3 shown, Figure 3 For the "winter" character on the plate cylinder 1 in Figure 4 shown, the position of the plate cylinder 1 where the incomplete font is located can be milled to form a pin hole 2.

[0045] As an optional implementation manner, see Figure 4 shown, the cross-sectional area of the pin hole 2 is larger than the incomplete characters or patterns.

[0046] The above structure can ensure that the incomplete font or pattern is removed as a whole without damaging the remaining characters or patterns, facilitating the re-embedding of the pin block 3 in the pin hole 2 and re-engraving on the pin block 3.

[0047] The printing roller repair method of this embodiment can repair the printing roller 1 when the patterns, text, etc. on the printing roller 1 are worn or damaged. The repair method described above is used to remove the part where the damaged text or pattern is located, and the pin block 3 is embedded to re-engrave the text or pattern. Only the part where the damaged text or pattern is located needs to be removed and replaced to achieve the repair of the printing roller 1. It is not necessary to replace the entire printing roller 1, which extends the service life of the printing roller 1 and reduces the printing cost.

[0048] As an optional implementation, the pin 3 is made of the same material as the printing roller 1, which makes it easier for the pin 3 to be more stably embedded in the pin hole 2. For example, the printing roller 1 is made of copper-zinc alloy, and the pin 3 is made of copper-zinc alloy or copper pin.

[0049] As an optional implementation, see Figure 6 As shown, before milling the surface 301 to be engraved on the pin block 3, the thickness of the pin block 3 is greater than the height of the pin hole 2, and the pin block 3 protrudes from the upper edge of the pin hole 2.

[0050] The thickness of the milled pin 3 is greater than the height of the pin hole 2. This way, when the pin 3 is inserted into the pin hole 2, the pin 3 protrudes from the upper edge of the pin hole 2, preventing damage to the surface of the pin 3 when it is hammered into the pin hole 2, which would cause damage to the upper surface of the pin 3 and affect the re-engraving of the text or pattern on the pin 3.

[0051] Specifically, the pin 3 can be driven into the pin hole 2 by a hammer or other means. If the thickness of the pin 3 is exactly equal to the height of the pin hole 2, the upper surface of the pin 3 is easily damaged when the external force of the hammer is large, resulting in cracks or unevenness on the pin 3. This can easily affect the quality of the pattern or text when re-engraving on the pin 3, thus affecting the printing effect.

[0052] Before milling the surface 301 to be engraved from the pin block 3, the thickness of the pin block 3 is greater than the height of the pin hole 2, and the pin block 3 protrudes from the upper edge of the pin hole 2. After the pin block 3 is inserted into the pin hole 2, see [link to relevant documentation]. Figure 6 and Figure 7 As shown, the portion of the pin block 3 protruding from the upper edge of the pin hole 2 is milled away, that is, the surface to be engraved 301 is milled out on the pin block 3, so that the surface to be engraved 301 is coplanar with the surface where the other text is located on the printing roller 1, which helps to ensure the flatness of the surface to be engraved 301. In this way, when re-engraving text or patterns on the surface to be engraved 301, the flatness of the text or patterns can be guaranteed, and the re-engraved text or patterns can be coplanar with the original text or patterns on the printing roller 1, thus ensuring printing quality.

[0053] As an optional implementation, see Figure 6 and Figure 7 As shown, the method of embedding and fixing the pin block 3 in the pin hole 2 includes: embedding the pin block 3 into the pin hole 2, and inserting a positioning member 4 into the part of the pin block 3 protruding from the pin hole 2. As an optional embodiment, see [reference needed]. Figure 6 and Figure 7 As shown, the positioning element 4 is inclined relative to the horizontal plane and protrudes from the surface of the pin block 3.

[0054] See Figure 6 and Figure 7 As shown, after the pin 3 is inserted into the pin hole 2, the positioning member 4 is fixed at the connection position between the pin 3 and the upper edge of the pin hole 2. Part of the positioning member 4 is embedded in the pin 3, and part of the positioning member 4 is located outside the pin 3. The positioning member 4 can further prevent the pin 3 from separating from the pin hole 2 and ensure the stability of the connection structure between the pin 3 and the pin hole 2.

[0055] The aforementioned positioning component 4 can be a rivet, pin, etc.

[0056] As an optional implementation, the positioning elements 4 are arranged at intervals around the pin block 3. This structure further prevents the pin block 3 from separating from the pin hole 2, ensuring the stability of the connection structure between the pin block 3 and the pin hole 2.

[0057] As an optional implementation, the above method involves re-engraving effective text or patterns on the pin block 3, including: engraving the removed original text or patterns in the middle of the pin block 3, or at a position offset from the middle of the pin block 3, according to the spacing and trajectory of the remaining text or patterns on the printing roller 1; ensuring that the spacing of the re-engraved text or patterns is consistent with that of the original text or patterns on the printing roller 1, and that the re-engraved text or patterns are located on the same preset line as the original text or patterns on the printing roller 1.

[0058] The repair method in this embodiment involves first inserting the pin block 3 into the pin hole 2, milling the engraved surface 301 on the pin block 3, and then re-engraving the text or pattern on the engraved surface 301; rather than first engraving the text or pattern on the pin block 3 and then inserting the pin block 3 into the pin hole 2. The advantage of the above steps in this repair method is that:

[0059] If text or patterns are engraved on pin 3 before it is inserted into pin hole 2, the following problems may occur: See Figure 9 As shown, after the pin block 3 is manufactured, the original text or pattern that was removed is usually re-engraved in the middle of the pin block 3. Due to processing errors, after the pin block 3 is embedded in the pin hole 2, the re-engraved text may no longer be on the same set straight line as the original text or pattern on the printing roller 1, and the text or pattern will be offset.

[0060] Or, such as Figure 8 The re-engraved text has a different spacing from the original text or pattern on roller 1, such as... Figure 8As shown, the character "冬" is located in the middle of the pin block 3. The character spacing h' between the character "冬" and the adjacent character "虫" is significantly greater than the character spacing between the other two adjacent characters, resulting in different overall character spacings of the text, deviating from the overall effect of the text before repair and affecting the printing quality.

[0061] In the repair method of this embodiment, first, the pin block 3 is embedded into the pin hole 2. A surface 301 to be engraved is milled on the pin block 3, and then characters or patterns are engraved again on the surface 301 to be engraved. In this way, due to manufacturing errors, according to the preset line where the original characters are located, or the character spacing between the original characters, etc., the incomplete characters or patterns can be engraved at any appropriate position on the surface 301 to be engraved of the pin block 3, such as Figure 10 As shown, the characters or patterns may not be engraved in the middle of the pin block 3 in order to eliminate manufacturing errors. Such as Figure 10 , the character spacing h between the character "冬" and the adjacent character "虫" is equal to the character spacing between the other two adjacent characters.

[0062] The above repair method can, according to manufacturing errors, after embedding the pin block 3, engrave the characters or patterns at the appropriate position on the pin block 3 according to the errors, ensure that the re-engraved characters or patterns are on the same preset line as the original characters or patterns on the plate cylinder 1, and ensure that the spacing between the re-engraved characters or patterns and the original characters or patterns on the plate cylinder 1 is consistent.

[0063] As an optional implementation manner, the cross-section of the pin hole 2 is square or circular, which is convenient for processing.

[0064] When engraving characters, a numerically controlled machine tool in the prior art can be used. During engraving, find the file corresponding to the plate cylinder 1 on the numerically controlled machine tool, find the registration point in the original file, make a registration file, and find the coordinate error of the plate cylinder 1 on the X-axis and Y-axis within plus or minus 0.01 mm using the registration crosshairs left less than on the original plate. Find the height of the original pattern, find the incomplete font in the file, and make the file of the pin hole 2. Here, it must be noted that the font of the file is consistent with that of the original plate cylinder 1. Replace the milling cutter. Here, pay attention to milling a hole with a suitable font size by the milling cutter. Here, pay attention that the depth of the pin hole 2 should not be greater than 3 mm, otherwise there may be a risk of punching through the plate cylinder 1. The machining center machine tool mills out copper pins with the same hole positions, leaving a tolerance of +0.04 mm, and the thickness of the copper pins is not less than 5 mm.

[0065] Specifically, the method for repairing the printing roller in this embodiment includes: drilling a pin hole 2 at the location of the missing text or pattern on the printing roller 1 to remove the missing text or pattern; inserting a pin block 3 into the pin hole 2 and inserting a positioning piece 4 at the part of the pin block 3 that protrudes from the pin hole 2; milling out the surface to be engraved 301 on the pin block 3 so that the surface to be engraved 301 is coplanar with the surface where the remaining text is located on the printing roller 1; engraving the removed original text or pattern in the middle of the pin block 3 or at a position off from the middle of the pin block 3 according to the spacing and trajectory of the remaining text or pattern on the printing roller 1; making the spacing of the re-engraved text or pattern consistent with the original text or pattern on the printing roller 1, and making the re-engraved text or pattern and the original text or pattern on the printing roller 1 located on the same preset line.

[0066] Example 2

[0067] This embodiment provides a printing roller 1, which is repaired using the above-described printing roller repair method.

[0068] The above repair method can be used to repair the printing roller 1 without replacing the entire printing roller 1, thus extending the service life of the printing roller 1 and reducing printing costs.

[0069] The specific features, structures, or characteristics described in this specification may be combined in any suitable manner in one or more embodiments or examples.

[0070] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0071] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for repairing printing rollers, characterized in that, The method includes: Make pin holes at the missing text or pattern on the printing roller to remove the missing text or pattern; A fixing pin block is embedded in the pin hole; The surface to be engraved is milled out on the pin block, so that the surface to be engraved is coplanar with the surface where the remaining text is located on the printing roller; Re-engraving valid text or patterns on the pin block; Before milling the surface to be engraved on the pin block, the thickness of the pin block is greater than the height of the pin hole, and the pin block protrudes from the upper edge of the pin hole; The re-engraving of valid text or patterns on the pin block includes: Based on the spacing and trajectory of the remaining text or patterns on the printing roller, the removed original text or patterns are engraved in the middle of the pin block, or in a position offset from the middle of the pin block. The spacing between the re-engraved text or pattern and the original text or pattern on the printing roller is made consistent, and the re-engraved text or pattern and the original text or pattern on the printing roller are located on the same preset line.

2. The method for repairing printing rollers according to claim 1, characterized in that, The fixed pin block embedded in the pin hole includes: The pin is inserted into the pin hole, and a positioning element is inserted into the part of the pin that protrudes from the pin hole.

3. The method for repairing printing rollers according to claim 2, characterized in that, The positioning element is inclined relative to the horizontal plane and protrudes from the surface of the pin block.

4. The method for repairing printing rollers according to claim 2, characterized in that, The positioning elements are arranged at intervals around the pin block.

5. The method for repairing printing rollers according to claim 1, characterized in that, The cross-sectional area of ​​the pin hole is larger than the missing text or pattern.

6. The method for repairing printing rollers according to claim 1, characterized in that, The pin is made of the same material as the printing roller.

7. The method for repairing printing rollers according to claim 1, characterized in that, The cross-section of the pin hole is square or circular.

8. A printing roller, characterized in that, The printing roller is repaired using the printing roller repair method according to any one of claims 1-7.

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