A spray-on photosensitive thermal sensitive CTP plate material
Patent Information
- Application Number
- CN202522574737.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-04
- Publication Date
- 2026-10-09
- Estimated Expiration
- 2035-12-04
AI Technical Summary
[0003]传统结构存在以下技术痛点：传统铝基板多为实心结构，厚度需达到0.5mm以上才能满足基本刚性要求，导致版材重量大(每平方米约1.5kg)，高速印刷时易因离心力产生形变，影响套印精度(误差常超过0.05mm)
[0015]结构协同性：各层通过材料与工艺的匹配，实现“支撑-强化-感光-防护”一体化设计，解决了传统CTP版材抗折弯性差、感光精度低、易划伤的问题；
Smart Images
Figure CN224828215U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field, and in particular to a spray-coated photosensitive thermal CTP plate. Background Technology
[0002] As a core consumable in digital printing, CTP plates directly affect printing accuracy, durability, and production efficiency. In existing technologies, CTP plates typically use an aluminum substrate as a support, with an oxide layer, a photosensitive layer, and a protective layer sequentially deposited on the surface. Image transfer is achieved through laser exposure.
[0003] Traditional structures suffer from the following technical drawbacks: Traditional aluminum substrates are mostly solid structures, requiring a thickness of at least 0.5mm to meet basic rigidity requirements, resulting in heavy printing plates (approximately 1.5kg per square meter). During high-speed printing, centrifugal force easily causes deformation, affecting registration accuracy (often with errors exceeding 0.05mm). If the thickness is reduced (e.g., to below 0.3mm), bending resistance decreases significantly, making permanent deformation or cracks more likely during transportation and installation, resulting in a scrap rate as high as 8%-12%.
[0004] Existing printing plates often combine various coatings using simple coating processes, resulting in poor interface compatibility: the aluminum substrate oxide layer and the photosensitive layer are prone to differences in thermal expansion coefficients (aluminum 23×10⁻⁶). -6 / ℃, resin 50×10 -6 / ℃) causes peeling, resulting in the photosensitive layer falling off; when the photosensitive layer is directly exposed to the external environment, it is easily affected by mechanical impact (such as equipment collision) or chemical corrosion (such as developer residue), and the photosensitivity decay rate exceeds 30% (after using 10,000 prints).
[0005] To improve printing durability, traditional printing plates often increase the thickness of the photosensitive layer (e.g., 8-10μm). However, an excessively thick photosensitive layer can lead to uneven laser energy absorption and reduced imaging resolution (only 1750dpi). At the same time, the lack of targeted tensile and impact resistance design makes the printing plate prone to tensile deformation under high-speed printing tension (150-200N / m), resulting in image distortion.
[0006] To address the aforementioned issues, there is an urgent need in this field to develop a CTP plate structure that combines lightweight, high bending resistance, high photosensitivity, and damage resistance to meet the demands of modern printing for high precision, high efficiency, and long lifespan. Utility Model Content
[0007] The main technical problem solved by this utility model is to provide a sprayable photosensitive thermal CTP plate, thereby solving one or more of the above-mentioned prior art problems.
[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a spray-coated photosensitive thermal CTP plate, comprising an aluminum base plate, wherein the aluminum base plate is covered with an aluminum oxide layer, and a tensile layer, an impact-resistant layer, a photosensitive polymer layer and a protective layer are sequentially disposed on the aluminum oxide layer; the innovation is that the aluminum base plate comprises an upper layer, a lower layer and a bending-resistant layer disposed between the two, wherein the bending-resistant layer is composed of a plurality of bending-resistant units.
[0009] In some embodiments, the anti-bending unit includes an upper hemisphere and a lower hemisphere arranged in a mirror-symmetric manner, with the top of the upper hemisphere supported on the lower end face of the upper layer and the bottom of the lower hemisphere supported on the upper end face of the lower layer.
[0010] In some implementations, the upper and lower hemispheres are integrally formed.
[0011] In some embodiments, the tensile layer is made of carbon fiber reinforced composite material with a thickness of 5-10 μm.
[0012] In some embodiments, the photosensitive polymer layer comprises a photosensitive resin and nanoscale photosensitive particles, with a photosensitive wavelength range of 350-450 nm.
[0013] In some embodiments, the protective layer is a transparent polyimide film with a thickness of 2-5 μm and a scratch-resistant coating on its surface.
[0014] The beneficial effects of this utility model are:
[0015] Structural synergy: Through the matching of materials and processes, each layer achieves an integrated design of "support-reinforcement-photosensitive-protection", which solves the problems of poor bending resistance, low photosensitive accuracy and easy scratching of traditional CTP plates;
[0016] Process compatibility: Spraying and lamination processes are compatible with existing production lines, requiring no additional equipment and reducing production costs by 15%-20%;
[0017] Environmental adaptability: Improved temperature and humidity resistance, can be stored for 6 months in high humidity (RH 80%) and high temperature (50℃) environments without performance degradation. Attached Figure Description
[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:
[0019] Figure 1 This is a schematic diagram of the structure of a spray-coated photosensitive thermal CTP plate according to this utility model.
[0020] Figure 2 This is a front view of a spray-coated photosensitive thermal CTP plate according to this utility model.
[0021] Figure 3 yes Figure 2 Cross-sectional view along the AA direction. Detailed Implementation
[0022] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0023] like Figures 1 to 3 As shown, the embodiment of this utility model includes: a spray-coated photosensitive thermal CTP plate, the overall structure of which, from bottom to top, consists of an aluminum base plate, an aluminum oxide layer 200, a tensile layer 300, an impact-resistant layer 400, a photosensitive polymer layer 500, and a protective layer 600. Each layer is bonded sequentially through a spraying or composite process to form an overall plate with a thickness of 0.3-0.5mm.
[0024] The aluminum base plate has a three-layer composite structure, including an upper layer 111 (thickness 0.1-0.15mm), a lower layer 112 (thickness 0.1-0.15mm), and an intermediate anti-bending layer (thickness 0.05-0.1mm). The upper layer 111 and the lower layer 112 are both made of 1050 pure aluminum, which has good ductility and surface flatness. The anti-bending layer is composed of several arrayed anti-bending units with a spacing of 0.2-0.5mm between adjacent units, and the whole structure is distributed in a honeycomb pattern.
[0025] Bending resistance unit: Each bending resistance unit is a "double hemisphere symmetrical structure" with a diameter of 0.1-0.3mm, consisting of an upper hemisphere 121 and a lower hemisphere 122, which are integrally formed by a circular arc transition section (made of 6061 aluminum alloy, strengthened by T6 heat treatment); the top of the upper hemisphere 121 is fixed to the upper 111 aluminum base plate by diffusion welding, and the bottom of the lower hemisphere 122 is connected to the lower 112 aluminum base plate by the same process, forming a mechanical structure of "upper and lower support, and middle elastic buffer".
[0026] The alumina layer 200 is formed on the surface of the aluminum base plate through an anodizing process, with a thickness of 10-15 μm and a porosity of 15%-20%. The pores are filled with a silane coupling agent to enhance the interfacial bonding force with the upper 111 tensile layer 300.
[0027] The tensile layer 300 is made of carbon fiber reinforced epoxy resin composite material (carbon fiber volume fraction 30%-40%), which is coated on the surface of the alumina layer 200 by spraying process, with a thickness of 5-10μm; the carbon fibers are oriented along the length of the plate, and the tensile strength is ≥300MPa.
[0028] The impact-resistant layer 400 is made of polyurethane elastomer (Shore hardness 60-70A), with a thickness of 8-12μm, and is bonded to the tensile layer 300 through a roll-forming composite process. It contains hollow glass microspheres with a diameter of 1-3μm, comprising 10%-15% by volume.
[0029] The photosensitive polymer layer 500 is composed of photosensitive resin (70%-80%), nano-sized photosensitive particles (TiO2, particle size 50-100nm, 15%-20%), and additives (dispersants, stabilizers, etc., 5%-10%). It is coated using inkjet printing technology, with a thickness of 3-5μm. The surface of the photosensitive particles is modified with hydroxyl groups, which can form hydrogen bonds with the photosensitive resin, improving dispersion stability.
[0030] The protective layer 600 is made of a transparent polyimide film (2-5 μm thick), with a SiO2 scratch-resistant coating (0.5-1 μm thick, hardness ≥ H) formed on its surface by plasma deposition. The film is bonded to the photosensitive polymer layer 500 by hot pressing, with a light transmittance ≥ 90% (350-450 nm wavelength range).
[0031] The bending resistance principle of the aluminum base plate's bending resistance unit: When the plate is subjected to bending force, the upper hemisphere 121 and lower hemisphere 122 of the bending resistance unit absorb energy through elastic deformation—the upper hemisphere 121 expands to both sides when compressed, and the lower hemisphere 122 contracts towards the center when stretched. The arc transition section disperses the stress throughout the entire unit array, avoiding localized stress concentration. Simultaneously, the elastic modulus of 6061 aluminum alloy (69 GPa) is close to that of pure aluminum base plate (70 GPa), ensuring deformation coordination and preventing interface delamination.
[0032] The advantages of the aluminum base plate bending resistance unit are: compared with the traditional solid aluminum base plate, the bending resistance layer reduces the weight by 20%-30%, while the bending strength is increased by 40% (three-point bending test shows that the fracture deflection is increased from 3mm to 5mm).
[0033] The double hemisphere structure can achieve bidirectional bending buffer (i.e., it can resist bending in both the length and width directions of the sheet), which solves the limitations of the traditional unidirectional reinforcement structure;
[0034] The array arrangement design makes the stress distribution more uniform, and no cracks are generated on the surface of the plate after repeated bending (1000 cycles test).
[0035] The collaborative working principles and advantages of each functional layer are as follows:
[0036] Alumina layer 200: The porous structure not only improves the adhesion to the aluminum base plate (peel strength ≥5N / cm), but also stores the resin of subsequent coatings through capillary action, reducing interlayer bubbles;
[0037] Tensile layer 300: The oriented carbon fibers can resist the tensile stress of the plate during the development and printing process (such as the tension during high-speed transmission), and avoid the registration error caused by plate deformation (error ≤ 0.01mm).
[0038] Impact-resistant layer 400: The composite structure of polyurethane elastomer and hollow glass microspheres can absorb external impact energy (such as equipment collisions), which increases the impact resistance of photosensitive polymer layer 500 by 60% (drop ball impact test shows that the damage threshold increases from 0.5J to 0.8J).
[0039] Photosensitive polymer layer 500: The photosensitive wavelength (350-450nm) of nano-TiO2 particles is matched with ultraviolet laser exposure equipment, and the photosensitivity is ≥20mJ / cm. 2 The imaging resolution can reach 2400 dpi;
[0040] Protective layer 600: The SiO2 scratch-resistant coating can withstand ≥500 cycles of steel wool (#0000) friction without scratches, while the temperature resistance of polyimide (long-term use temperature -20℃~150℃) ensures that the plate does not deform in high-temperature environments.
[0041] The working principle of this technical solution is as follows: the aluminum base plate serves as the core support, achieving a balance between lightweight and high bending resistance through the bending resistance unit; the alumina layer 200 and the tensile layer 300 form a "bottom reinforcement system" to ensure the dimensional stability of the plate during processing; the impact-resistant layer 400 and the protective layer 600 constitute a "surface protection system" to protect the photosensitive polymer layer 500 from mechanical damage; the photosensitive polymer layer 500 undergoes a photochemical reaction under ultraviolet laser exposure to form a high-precision image, ultimately achieving a printing effect with a printing durability of ≥100,000 impressions.
[0042] The advantages of this technical solution are:
[0043] Structural synergy: Through the matching of materials and processes, each layer achieves an integrated design of "support-reinforcement-photosensitive-protection", which solves the problems of poor bending resistance, low photosensitive accuracy and easy scratching of traditional CTP plates;
[0044] Process compatibility: Spraying and lamination processes are compatible with existing production lines, requiring no additional equipment and reducing production costs by 15%-20%;
[0045] Environmental adaptability: Improved temperature and humidity resistance, can be stored for 6 months in high humidity (RH 80%) and high temperature (50℃) environments without performance degradation.
[0046] The above design is particularly suitable for high-speed rotary printing, high-precision packaging printing and other similar scenarios.
[0047] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.
Claims
1. A spray-coated photosensitive thermal CTP plate, comprising an aluminum base plate, wherein the aluminum base plate is externally covered with an aluminum oxide layer (200), and the aluminum oxide layer (200) is sequentially provided with a tensile layer (300), an impact-resistant layer (400), a photosensitive polymer layer (500), and a protective layer (600); characterized in that: The aluminum base plate includes an upper layer (111), a lower layer (112), and a bending-resistant layer disposed between the two, the bending-resistant layer being composed of several bending-resistant units.
2. The spray-coated photosensitive thermal CTP plate according to claim 1, characterized in that: The bending resistance unit includes an upper hemisphere (121) and a lower hemisphere (122) arranged in a mirror symmetry. The top of the upper hemisphere (121) is supported on the lower end face of the upper layer (111), and the bottom of the lower hemisphere (122) is supported on the upper end face of the lower layer (112).
3. The spray-coated photosensitive thermal CTP plate according to claim 2, characterized in that: The upper hemisphere (121) and the lower hemisphere (122) are integrally formed structures.
4. The spray-coated photosensitive thermal CTP plate according to claim 1, characterized in that: The tensile layer (300) is made of carbon fiber reinforced composite material with a thickness of 5-10 μm.
5. The photosensitive thermal CTP plate according to claim 1, characterized in that: The photosensitive polymer layer (500) comprises photosensitive resin and nanoscale photosensitive particles, with a photosensitive wavelength range of 350-450nm.
6. The spray-coated photosensitive thermal CTP plate according to claim 1, characterized in that: The protective layer (600) is a transparent polyimide film with a thickness of 2-5 μm and a scratch-resistant coating on its surface.