Processing method of ceramic sealing pad printing aluminum plate and ceramic sealing pad printing aluminum plate
By combining aluminum plates and galvanized plates to form ceramic-sealed pad printing aluminum plates, and using laser engraving, the problems of high cost and leakage of pad printing steel plates are solved, achieving low-cost, high-security pad printing effect, and is compatible with the magnetic fixation of existing pad printing machines.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- WUXI CHENGTONG MICROELECTRONICS CO LTD
- Filing Date
- 2026-06-23
- Publication Date
- 2026-08-04
AI Technical Summary
In existing pad printing processes, pad printing steel plates are expensive and prone to leakage, making it difficult to meet the confidentiality requirements of military-grade chips. Furthermore, outsourced etching faces high environmental qualification thresholds.
The process employs a ceramic-sealed pad printing method, which combines aluminum and galvanized sheets to form a top oxide layer for engraving. The bottom galvanized surface is magnetically attached and fixed, requiring only laser engraving and avoiding outsourced etching. The oxide layer is controlled at 20–50 μm to protect the underlying aluminum substrate and ensure no damage during the engraving process.
It reduces the cost of pad printing plates, improves the level of confidentiality, ensures that the engraving process does not damage the underlying aluminum substrate, and is compatible with the magnetic fixing structure of existing pad printing machines.
Smart Images
Figure CN122501049A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of pad printing plate manufacturing technology, specifically to a processing method for ceramic-sealed pad printing aluminum plate and the ceramic-sealed pad printing aluminum plate. Background Technology
[0002] Ceramic encapsulation, short for "ceramic packaging," is a highly reliable packaging method for electronic components, widely used in military-grade chips or components. Military-grade chips or components require pad printing to imprint markings and parameters; due to the involvement of military products, confidentiality is extremely high, and the pad-printed patterns are also classified.
[0003] Currently, pad printing technology generally uses pad printing steel plates for outsourced etching of pad printing patterns (because etching is a typical chemical process with extremely high environmental qualification thresholds, chip manufacturers do not have etching processing capabilities), which can easily cause leakage of pad printing patterns, and the cost of steel plates of the same size is high, about 5 times that of pad printing aluminum plates. Summary of the Invention
[0004] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a processing method for ceramic-sealed pad printing aluminum plates. This method solves the technical problems of leakage due to outsourced etching and high cost of pad printing steel plates. The pad printing plate does not require outsourced etching; only a laser machine is needed to laser engrave the pad printing pattern, resulting in a high level of confidentiality. The pad printing aluminum plate is formed by combining aluminum and galvanized plates, significantly reducing costs. The top aluminum surface of the composite plate is coated with an oxide layer, which is uniform and not only protects the substrate and improves hardness, but more importantly, it serves as the direct working layer for engraving the pad printing pattern. The oxide layer is controlled at 20-50μm, which is much larger than the engraving depth required for the pad printing pits. During engraving, laser energy is only consumed in the oxide layer, ensuring that the engraving process does not damage the underlying aluminum substrate, and the edges of the pad printing pits are clear and burr-free. The bottom galvanized surface of the composite plate has magnetic attraction properties, thus adapting to the magnetic fixing structure of existing pad printing machines.
[0005] The objective of this invention is achieved as follows: A method for processing ceramic-sealed pad printing aluminum plates includes the following steps: Step 1: Unwind and level the aluminum coil with film. Step 2: After leveling, remove the thin film from the surface of the aluminum plate and pre-treat the aluminum coil; Step 3: Apply a polymer oxide coating to both sides of the aluminum plate; after spraying, dry in a drying oven. The coating liquid comprises the following components by weight: 5-10 wt% nano-metal oxide, 6-10 wt% binder, 10-20 wt% dispersant, and the remainder is solvent; Step 4: Cut the aluminum sheet with double-sided oxide coating into aluminum sheets of fixed length and width, leaving a processing allowance; Step 5: Flatten the galvanized sheet roll and cut it into galvanized sheets that match the size of the aluminum sheet; Step 6: The robotic arm picks up the galvanized sheet and places it on the glue application platform. After applying glue, the aluminum sheet from Step 4 is stacked on the galvanized sheet, the pressing assembly is pressed together, and the scraper removes the excess glue. Step 7: Curing the pressed composite board; Step 8: Apply a protective film to the surface of the top aluminum plate of the composite panel; Step 9: Punch the laminated composite board, remove excess material, and obtain the finished ceramic-sealed pad printing aluminum plate.
[0006] Preferably, in step three, the oxide layer is applied using a wet coating method, with one coating unit on each of the upper and lower sides of the substrate; the coating unit includes a storage bin and a slit die head that are interconnected, with the slit die head outlet aligned with the substrate.
[0007] Preferably, in step three, the nano-metal oxide is one or more of silicon oxide, aluminum oxide, and zirconium oxide, but it must contain silicon oxide.
[0008] Preferably, when the three are mixed, the ratio of silicon dioxide, aluminum oxide and zirconium oxide is 2:1:1.
[0009] Preferably, the dispersant is a combination of ammonium polyacrylate and polyethylene glycol, and the pH of the coating solution is controlled at 9-10.
[0010] Preferably, in step two, the pretreatment involves polishing and grinding the ordinary aluminum plate to a mirror finish, so that the surface Ra of the aluminum plate is controlled at 0.01-0.05μm.
[0011] The ceramic-sealed pad printing plate obtained by the above-mentioned processing method of ceramic-sealed pad printing aluminum plate includes an aluminum plate layer and a galvanized plate layer. Both the upper and lower surfaces of the aluminum plate layer are coated with a polymer oxide layer. An adhesive layer is provided between the lower polymer oxide layer and the galvanized plate layer, and a protective film layer is provided on the outer side of the upper polymer oxide layer.
[0012] The beneficial effects of this invention are: Retaining the advantages of lightweight and low cost of aluminum plates, pad printing plates do not require outsourced etching; only a laser machine needs to be purchased for laser engraving of pad printing patterns, ensuring a high level of confidentiality. The pad printing aluminum plate is made of aluminum plate and galvanized plate. The top aluminum surface of the composite plate is coated with an oxide layer. The oxide layer is uniform and not only protects the substrate and improves hardness, but more importantly, it serves as the direct working layer for pad printing pattern engraving. The oxide layer is controlled at 20-50μm, which is much larger than the engraving depth required for pad printing pits. During engraving, the laser energy is only consumed in the oxide layer, ensuring that the engraving process does not damage the underlying aluminum substrate. The edges of the pad printing pits are clear and burr-free. The bottom galvanized surface of the composite board has magnetic attraction properties, thus adapting to the magnetic fixing structure of existing pad printing machines; Before coating, ordinary aluminum plates are polished to a mirror finish to control the surface Ra of the aluminum plate at 0.01-0.05μm, providing a larger effective contact area and higher surface energy to prepare for coating, enhance the adhesion of the functional coating to the plate surface, and ensure that the coating layer adheres firmly. In addition to serving as a reinforcing component, the silica in the coating solution also plays a dual role in assisting bonding and dispersing. Attached Figure Description
[0013] Figure 1 This is a process flow diagram of a method for processing ceramic-sealed pad printing aluminum plates according to the present invention.
[0014] Figure 2 This is a schematic diagram of the structure of the ceramic-sealed pad printing aluminum plate obtained by the present invention.
[0015] in: 1. Aluminum coil; 2. Leveling machine; 3. Film; 4. Coating unit; 5. Drying oven; 6. Cutting machine; 7. Aluminum plate; 8. Galvanized sheet coil; 9. Galvanized sheet; 10. Adhesive application device; 11. Protective film; 12. Ceramic-sealed pad-printed aluminum plate; 12.1 Aluminum plate layer; 12.2 Galvanized sheet layer; 12.3 Polymer oxide layer; 12.4 Adhesive layer; 12.5 Protective film layer. Detailed Implementation
[0016] See Figure 1 This invention relates to a method for processing ceramic-sealed pad printing aluminum plates, comprising the following steps: Step 1: Unwind and level the aluminum coil (the surface of the finished aluminum coil is covered with a film to prevent scratches), and leveling is done with the film on. Step 2, Preparation before coating: After leveling machine 2, remove the film 3 from the surface of the aluminum plate and pre-treat the aluminum coil. Polish the ordinary aluminum plate to a mirror finish, so that the surface Ra of the aluminum plate is controlled at 0.01-0.05μm, providing a larger effective contact area and higher surface energy to prepare for coating, enhance the adhesion of the functional coating to the surface of the plate, and ensure that the coating layer is firmly adhered. Step 3: Apply a double-sided polymer oxide coating to the aluminum plate. The oxide layer is applied using a wet coating method. One coating unit 4 is set on each of the top and bottom sides of the plate to achieve simultaneous coating on both sides. The coating unit 4 includes a slit die and a storage tank. The storage tank is connected to the slit die to control the gap between the slit die outlet and the plate, ensuring uniform spraying. After spraying, the plate enters the drying oven 5 for drying. The storage tank is used to store the coating liquid, which includes the following components by mass: 5-10 wt% nano-metal oxide, 6-10 wt% binder, 10-20 wt% dispersant, and the remainder being solvent. The nano-metal oxide is one or more of silicon oxide, aluminum oxide, and zirconium oxide, but it must contain silicon oxide. When the three are mixed, the ratio of silicon oxide, aluminum oxide, and zirconium oxide is 2:1:1 to ensure the performance of the coating liquid. The dispersant is a combination of ammonium polyacrylate and polyethylene glycol to control the pH of the coating liquid at 9-10. Step 4: Cut the aluminum coil with double-sided oxide coating into rectangular aluminum plates 7 using the cutting machine 6, leaving a processing allowance; Step 5: Prepare galvanized sheet: Flatten the galvanized sheet coil 8 and cut it into galvanized sheets 9 that are compatible with the size of the aluminum sheet; Step 6: Use the glue application device 10 to perform composite pressing of aluminum plate 7 and galvanized plate 9; the robot arm picks up the galvanized plate 9 and places it on the glue application platform. After applying glue, the aluminum plate 7 from step 4 is stacked on the galvanized plate 9, the pressing assembly is pressed together, and the scraper removes the excess glue. Step 7: Curing the pressed composite board; Step 8: Apply a protective film 11 to the surface of the top aluminum plate of the composite board to prevent impurities from contaminating the pad printing surface. Step 9: Punch the laminated composite board, remove excess material, and obtain the finished ceramic-sealed pad printing aluminum plate 12. The total thickness of the ceramic-sealed pad printing aluminum plate 12 shall not exceed 1mm.
[0017] See Figure 2 The ceramic-sealed pad printing aluminum plate 12 obtained by the above processing method includes an aluminum plate layer 12.1 and a galvanized plate layer 12.2. Both the upper and lower surfaces of the aluminum plate layer 12.1 are coated with a polymer oxide layer 12.3. An adhesive layer 12.4 is provided between the lower polymer oxide layer 12.3 and the galvanized plate layer 12.2. A protective film layer 12.5 is provided on the outer side of the upper polymer oxide layer 12.3. Example 1
[0018] Step 1: Unwind and level the aluminum coil with film. Step 2: After leveling, remove the thin film 3 from the surface of the aluminum plate and pre-treat the aluminum coil to control the surface Ra of the aluminum plate to 0.02μm; Step 3: Apply a polymer oxide layer to both sides of the aluminum plate. The oxide layer is applied using a wet coating method. After spraying, the plate is dried in a drying oven at 150°C. The coating solution comprises the following components by weight: 6 wt% nano-sized silica, 3 wt% nano-sized alumina, 1 wt% nano-sized zirconium oxide, 8 wt% binder, 15 wt% mixture of ammonium polyacrylate and polyethylene glycol in a 1:1 ratio, with the remainder being solvent; the pH of the coating solution is 9.5. Step 4: Cut the aluminum coil with double-sided oxide coating into rectangular aluminum plates 7 using the cutting machine 6, leaving a 5mm allowance. Step 5: Prepare galvanized sheet: Flatten the galvanized sheet coil 8 and cut it into galvanized sheets 9 that are compatible with the size of the aluminum sheet; Step 6: Use the glue application device 10 to perform composite pressing of aluminum plate 7 and galvanized plate 9; the robot arm picks up the galvanized plate 9 and places it on the glue application platform. After applying glue, the aluminum plate 7 from step 4 is stacked on the galvanized plate 9, the pressing assembly is pressed together, and the scraper removes the excess glue. Step 7: Curing the pressed composite board at 80℃ for 2 hours; Step 8: Apply a protective film 11 to the surface of the top aluminum plate of the composite board to prevent impurities from contaminating the pad printing surface. Step 9: Stamp the laminated composite board, remove excess material, and obtain the finished ceramic-sealed pad printing aluminum plate 12. Example 2
[0019] The difference from Example 1 is that in step three, The drying temperature is 150℃. The coating liquid contains the following components by weight: 8 wt% nano-sized silica, 4 wt% nano-sized alumina, 4 wt% nano-sized zirconium oxide, 10 wt% binder, and 18 wt% mixture of ammonium polyacrylate and polyethylene glycol.
[0020] Comparative Example 1: The polishing and grinding in step two are omitted, and the aluminum plate is coated without mirror treatment. The remaining steps are the same as in Example 1.
[0021] Comparative Example 2: In step three, no binder or dispersant was added to the coating liquid; only nano-metal oxides were mixed with water. The remaining steps were the same as in Example 1.
[0022] Results: The coating liquid had poor dispersibility, resulting in obvious agglomeration and precipitation. The coating cracked and peeled off after application.
[0023] Comparative Example 3: In step three, the nano-metal oxides in the coating solution are aluminum oxide and zirconium oxide in a 1:1 ratio, and the remaining structures are the same as in Example 1.
[0024] Result: The coating has too high hardness and insufficient flexibility, resulting in microcracks in the coating during stamping.
[0025] The performance of the finished ceramic-sealed aluminum plates produced in Examples 1-2 and Comparative Examples 1-3 was compared. The oxide coatings of Examples 1 and 2 were uniform and had strong adhesion. The coating liquid of Comparative Example 1 had poor adhesion, and the coating peeled off and was unevenly distributed. The coating liquid of Comparative Example 2 had poor dispersibility, with obvious agglomeration and precipitation. The coating cracked and fell off after coating. The coating of Comparative Example 3 had excessive hardness and insufficient flexibility, and microcracks appeared in the coating during stamping.
[0026] In summary, in addition to serving as a reinforcing component, silica in the coating solution also plays a dual role in assisting bonding and dispersing. The active silanol groups significantly enhance the interfacial bonding force between the coating and the aluminum substrate. At the same time, silica particles, silica with alumina, and zirconium oxide act as inorganic binders through silanol condensation. The nanoscale silica particles have a large specific surface area and can be adsorbed on the surface of alumina and zirconium oxide particles, effectively isolating different particles through steric hindrance and preventing their agglomeration and precipitation.
[0027] In addition to the above embodiments, the present invention also includes other embodiments. All technical solutions formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of the present invention.
Claims
1. A method for processing ceramic-sealed pad printing aluminum plates, characterized in that: Includes the following steps: Step 1: Unwind the aluminum coil and level the film. Step 2: After leveling, remove the thin film from the surface of the aluminum plate and pre-treat the aluminum coil; Step 3: Apply a polymer oxide coating to both sides of the aluminum plate; after spraying, dry in a drying oven. The coating liquid comprises the following components by weight: 5-10 wt% nano-metal oxide, 6-10 wt% binder, 10-20 wt% dispersant, and the remainder is solvent; Step 4: Cut the aluminum sheet with double-sided oxide coating into aluminum sheets of fixed length and width, leaving a processing allowance; Step 5: Flatten the galvanized sheet roll and cut it into galvanized sheets that match the size of the aluminum sheet; Step 6: The robotic arm picks up the galvanized sheet and places it on the glue application platform. After applying glue, the aluminum sheet from Step 4 is stacked on the galvanized sheet, the pressing assembly is pressed together, and the scraper removes the excess glue. Step 7: Curing the pressed composite board; Step 8: Apply a protective film to the surface of the top aluminum plate of the composite panel; Step 9: Punch the laminated composite board, remove excess material, and obtain the finished ceramic-sealed pad printing aluminum plate.
2. The processing method of a ceramic-sealed pad printing aluminum plate according to claim 1, characterized in that: In step three, the oxide layer is applied using a wet coating method, with one coating unit on each of the upper and lower sides of the board. Each coating unit includes a storage tank and a slit die head that are connected to each other, with the slit die head outlet aligned with the board.
3. A processing method for a ceramic-sealed pad printing aluminum plate according to claim 1 or 2, characterized in that: In step three, the nano-metal oxide is one or more of silicon oxide, aluminum oxide and zirconium oxide, but it must contain silicon oxide.
4. The processing method of a ceramic-sealed pad printing aluminum plate according to claim 3, characterized in that: When the three are mixed, the ratio of silicon dioxide, aluminum oxide and zirconium oxide is 2:1:
1.
5. The processing method of a ceramic-sealed pad printing aluminum plate according to claim 3, characterized in that: The dispersant is a combination of ammonium polyacrylate and polyethylene glycol, and the pH of the coating solution is controlled at 9-10.
6. The processing method of a ceramic-sealed pad printing aluminum plate according to claim 1, characterized in that: In step two, the pretreatment involves polishing and grinding the ordinary aluminum plate to a mirror finish, so that the surface Ra of the aluminum plate is controlled at 0.01-0.05μm.
7. A ceramic-sealed pad printing plate obtained by the processing method of a ceramic-sealed pad printing aluminum plate according to any one of claims 1-6, characterized in that: It includes an aluminum plate layer and a galvanized plate layer. Both the upper and lower surfaces of the aluminum plate layer are coated with a polymer oxide layer. An adhesive layer is provided between the lower polymer oxide layer and the galvanized plate layer, and a protective film layer is provided on the outside of the upper polymer oxide layer.