Positive high printing rate thermal CTP offset plate material
Patent Information
- Application Number
- CN202522401401.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-12
- Publication Date
- 2026-09-22
- Estimated Expiration
- 2035-11-12
AI Technical Summary
[0003]本实用新型的目的是针对现有技术的不足之处，通过盐酸-硫酸混酸电解工艺形成多层级微坑结构，大幅提升比表面积和涂层结合力，感光层引入聚乙烯醇缩醛类共聚物作为成膜树脂，增强机械强度与耐刮擦性，解决了现有技术中普通热敏CTP版在长版印刷中易出现网点磨损、亲水层破坏，使用寿命短的问题
[0011]（1）本实用新型中通过设置支持体，经电解氧化处理的蜂窝状砂目铝版基材提供高强度支撑，增强涂层附着力，提高亲水性与耐磨性。
Smart Images
Figure CN224781587U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of CTP plate technology, and in particular to a positive high-durability thermal CTP offset printing plate. Background Technology
[0002] With the development of digital printing, computer-to-plate (CTP) technology has become mainstream. Among them, thermal CTP plates are widely used in commercial and packaging printing due to their high plate-making precision, good dot reproduction, and wide operating tolerance. Traditional PS plates require film exposure, which is cumbersome and environmentally unfriendly. CTP technology eliminates intermediate steps, improves efficiency, and reduces costs. In practical applications, UV ink printing places higher demands on the chemical resistance, scratch resistance, and printing durability of plates. Ordinary thermal CTP plates are prone to dot wear and hydrophilic layer damage in long-run printing, which limits their service life. Utility Model Content
[0003] The purpose of this invention is to address the shortcomings of existing technologies by forming a multi-level micro-pit structure through a hydrochloric acid-sulfuric acid mixed acid electrolysis process, which significantly improves the specific surface area and coating adhesion. The photosensitive layer introduces polyvinyl acetal copolymers as film-forming resins to enhance mechanical strength and scratch resistance, thus solving the problems of dot wear, hydrophilic layer damage, and short service life of ordinary thermal CTP plates in long-run printing.
[0004] To achieve the above objectives, this utility model provides the following technical solution:
[0005] A positive high-durability thermal CTP offset printing plate includes a support, a resin layer on the upper end of the support, a photosensitive layer on the upper end of the resin layer, the support being a honeycomb-shaped abrasive aluminum substrate treated by electrolytic oxidation, the resin layer including an alkali-soluble and solvent-resistant vinyl copolymer layer, a background dye layer on the upper end of the alkali-soluble and solvent-resistant vinyl copolymer layer, the photosensitive layer including an olefin copolymer layer containing benzenesulfonamide groups, a solubilizing system layer on the upper end of the olefin copolymer layer containing benzenesulfonamide groups, and an infrared dye layer on the upper end of the solubilizing system layer.
[0006] As a preferred embodiment, the support is formed by electrolysis of a mixed acid of hydrochloric acid and sulfuric acid to create a multi-level micropit structure with a diameter of 0.015-0.02 μm.
[0007] As a preferred embodiment, the alkali-soluble and solvent-resistant vinyl copolymer layer is a solvent-resistant vinyl multi-element copolymer layer.
[0008] As a preferred embodiment, the olefin copolymer layer containing benzenesulfonamide groups is a polyvinyl alcohol acetal copolymer layer.
[0009] As another preferred embodiment, the infrared dye layer is a cyanine dye layer, and a sulfonyl hydrazone acid source is added to the cyanine dye layer, which can be exposed at low energy of 120–140 mJ / cm².
[0010] The beneficial effects of this utility model are:
[0011] (1) In this utility model, by setting a support body, the honeycomb sand-mesh aluminum substrate treated by electrolytic oxidation provides high-strength support, enhances coating adhesion, and improves hydrophilicity and wear resistance.
[0012] (2) In this utility model, by setting a resin layer, an alkali-soluble and solvent-resistant vinyl copolymer and background dye, it resists UV ink erosion, improves development performance, and prevents contamination of non-image areas.
[0013] (3) In this utility model, by setting a photosensitive layer, the olefin copolymer containing benzenesulfonamide groups and the infrared dye are linked through a solubilization system layer to achieve laser thermal imaging, form a stable image, and improve resolution and dot retention.
[0014] In summary, this plate material has the advantages of high printing durability, resistance to UV ink corrosion, and strong stability, making it particularly suitable for the field of CTP plate technology. Attached Figure Description
[0015] To more clearly illustrate the technical solutions of 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.
[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.
[0017] Figure 2 This is a schematic diagram of the support structure in this utility model.
[0018] Figure 3 This is a schematic diagram of the resin layer structure in this utility model.
[0019] Figure 4 This is a schematic diagram of the photosensitive layer in this utility model. Detailed Implementation
[0020] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.
[0021] Example 1
[0022] like Figures 1 to 4As shown, this utility model provides a positive high-durability thermal CTP offset printing plate, including a support 1, a resin layer 2 on the upper end of the support 1, a photosensitive layer 3 on the upper end of the resin layer 2, the support 1 being a honeycomb-shaped abrasive aluminum substrate treated by electrolytic oxidation, the resin layer 2 including an alkali-soluble and solvent-resistant vinyl copolymer layer 21, a background dye layer 22 on the upper end of the alkali-soluble and solvent-resistant vinyl copolymer layer 21, the photosensitive layer 3 including an olefin copolymer layer 31 containing benzenesulfonamide groups, a solubilizing system layer 32 on the upper end of the olefin copolymer layer 31, and an infrared dye layer 33 on the upper end of the solubilizing system layer 32.
[0023] Furthermore, the support 1 forms a multi-level micro-pit structure with a diameter of 0.015-0.02 μm through electrolysis of hydrochloric acid and sulfuric acid. This can significantly improve the surface area and coating adhesion. Hydrochloric acid provides Cl⁻ ions, which preferentially dissolve the metal oxide layer and promote local corrosion to form initial micro-pits. The strong dehydrating properties of sulfuric acid can strip the reaction products and accelerate the development of the micro-pit depth, while inhibiting excessive lateral diffusion and ensuring that the pit diameter is precisely controlled at the submicron level. The mixed acid achieves selective penetration and depth control of the surface passivation film through physical-chemical coupling, forming a uniformly distributed multi-level pore structure.
[0024] Furthermore, the alkali-soluble and solvent-resistant vinyl copolymer layer 21 is a solvent-resistant vinyl multi-element copolymer layer. The solvent-resistant vinyl multi-element copolymer layer contains maleimide structural units and cross-linked acrylate units, which significantly improves the resistance to alcohol and ester solvents in UV inks. The molecules contain hydrophobic aromatic ring structures and dense cross-linked networks, which effectively block the penetration of small molecule additives in UV inks, prevent swelling and deformation of the graphic areas, and have a long service life.
[0025] Furthermore, the benzenesulfonamide-containing olefin copolymer layer 31 is a polyvinyl acetal copolymer layer. The benzenesulfonamide-containing olefin copolymer has a strong polar group that can form a hydrogen bond network with the hydroxyl groups of polyvinyl acetal, thereby enhancing the density of the coating. The introduction of the sulfonamide group enhances the stability of the coating in alkaline developer, avoiding excessive swelling or peeling. At the same time, its resistance to corrosion by the acidic components of photoinitiators in UV inks is significantly improved, extending the printing life. Moreover, the rigid aromatic ring structure of the benzenesulfonamide group and the flexible segments of polyvinyl acetal form a "rigid-flexible" microphase separation structure, giving the coating excellent resistance to mechanical wear.
[0026] Furthermore, the infrared dye layer 33 is a cyanine dye layer, and a sulfonyl hydrazone acid source is added to the cyanine dye layer, which can be exposed at a low energy of 120–140 mJ / cm². Cyanine dyes have strong absorption characteristics in the near-infrared region of 700–1400 nm. After adding the sulfonyl hydrazone acid source, the acid source decomposes to produce acid during exposure, catalyzing the chemical change of the cyanine dye, thereby significantly reducing the energy threshold for triggering the photochemical reaction. This allows development to be triggered at a low energy of 120–140 mJ / cm², avoiding thermal damage to the material caused by high energy.
[0027] Working process: First, a multi-level micro-pit structure is formed on the support 1 through a hydrochloric acid-sulfuric acid mixed acid electrolysis process. Then, a resin layer 2 is coated on the support 1 to resist UV ink erosion, improve development performance, and prevent contamination of non-image areas. Finally, a photosensitive layer 3 is coated. Photosensitive layer 3 introduces polyvinyl acetal copolymers as film-forming resins to enhance mechanical strength and scratch resistance, so that the entire CTP plate has high printing durability, resistance to UV ink corrosion, and strong stability.
[0028] In the description of this utility model, it should be understood that the terms "front and back", "left and right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.
[0029] Of course, those skilled in the art should understand that the term "a" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple. The term "a" should not be understood as a limitation on the quantity.
[0030] The above description is merely a preferred embodiment of this utility model, but the scope of protection of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art under the technical guidance of this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.
Claims
1. A positive high-durability thermal CTP offset printing plate, characterized in that: include The support (1) has a resin layer (2) at its upper end and a photosensitive layer (3) at its upper end. The support (1) is a honeycomb-shaped abrasive aluminum substrate treated by electrolytic oxidation. The resin layer (2) includes an alkali-soluble and solvent-resistant vinyl copolymer layer (21). The alkali-soluble and solvent-resistant vinyl copolymer layer (21) has a background dye layer (22) at its upper end. The photosensitive layer (3) includes an olefin copolymer layer (31) containing benzenesulfonamide groups. The olefin copolymer layer (31) containing benzenesulfonamide groups has a solubilizing system layer (32) at its upper end and an infrared dye layer (33) at its upper end.
2. The positive high-durability thermal CTP offset printing plate according to claim 1, characterized in that, The support (1) is formed by electrolysis of a mixture of hydrochloric acid and sulfuric acid to form a multi-level micro-pit structure with a diameter of 0.015-0.02 μm.
3. The positive high-durability thermal CTP offset printing plate according to claim 1, characterized in that, The alkali-soluble and solvent-resistant vinyl copolymer layer (21) is a solvent-resistant vinyl multi-element copolymer layer.
4. The positive high-durability thermal CTP offset printing plate according to claim 1, characterized in that, The olefin copolymer layer (31) containing benzenesulfonamide groups is a polyvinyl alcohol acetal copolymer layer.
5. The positive high-durability thermal CTP offset printing plate according to claim 1, characterized in that, The infrared dye layer (33) is a cyanine dye layer.