阅读说明：本技术 柔性感光印刷版的双层结构感光弹性体及其制备方法及包含其的柔性感光印刷版 (Double-layer structure photosensitive elastomer of flexible photosensitive printing plate, preparation method of double-layer structure photosensitive elastomer and flexible photosensitive printing pl) 是由 黄黎明 许文然 张戈 于 2020-06-12 设计创作，主要内容包括：本发明提供一种双层结构柔性感光印刷版及其制备方法,一种柔性感光印刷版的双层结构感光弹性体,感光弹性体包含两层,分别为面层和基层,所述基层的原料为柔性版回收料。一种柔性感光印刷版,印刷版从上到下依次包括保护片基、掩膜、感光弹性体、粘结层及支撑体；感光弹性体为所述的感光弹性体。利用柔性版从生产到使用产生的废料、废胶或其它低价材料,解决固废排放引起的环境问题,且不影响版材使用中所要求的性能。(The invention provides a double-layer structure flexible photosensitive printing plate and a preparation method thereof, and the double-layer structure photosensitive elastomer of the flexible photosensitive printing plate comprises two layers which are respectively a surface layer and a base layer, wherein the raw material of the base layer is a flexible plate reclaimed material. A flexible photosensitive printing plate comprises a protective film base, a mask, a photosensitive elastomer, a bonding layer and a support body from top to bottom in sequence; the photosensitive elastomer is the photosensitive elastomer. The environmental problem caused by solid waste discharge is solved by utilizing waste materials, waste glue or other low-price materials generated from production to use of the flexible plate, and the performance required by the plate material in use is not influenced.)

1. The utility model provides a bilayer structure sensitization elastomer of flexible sensitization printing plate which characterized in that: the photosensitive elastomer comprises two layers, namely a surface layer (3) and a base layer (4), wherein the raw material of the base layer (4) is a flexographic plate reclaimed material.

2. The photosensitive elastomer of double-layer structure for flexographic printing plate according to claim 1, characterized in that: the raw materials of the surface layer (3) are SBS or SIS solid materials and photosensitive liquid which are normally used by the flexible plate or regenerated SBS or SIS photosensitive materials.

3. The photosensitive elastomer of double-layer structure for flexographic printing plate according to claim 1, characterized in that: the recycled flexographic plate material can be waste plate and waste glue or other SBS or SIS photosensitive materials different from the surface layer.

4. The photosensitive elastomer of double-layer structure for flexographic printing plate according to claim 3, characterized in that: the waste plate is some rejects and waste edges generated in the production of the flexographic plate.

5. The photosensitive elastomer of double-layer structure for flexographic printing plate according to claim 3, characterized in that: the waste glue is generated during plate making of a plate making company, and more than 90% of the components in the waste glue are the same as those of a flexible plate except for residual solvents.

6. The photosensitive elastomer of double-layer structure for flexographic printing plate according to claim 1, characterized in that: the recycled materials adopt SIS or SBS of the type corresponding to the surface layer.

7. The method for preparing a photosensitive elastomer of double-layer structure for a flexographic printing plate according to any of claims 1 to 6, characterized in that: the method comprises the following steps:

(1) the preparation step of the base material includes at least one of the following steps (a), (b), (c):

(a) waste printing: removing the support film and the protective film of the waste plate, and feeding the remaining photosensitive layer into a crusher to be crushed into particles with the maximum size of not more than 10 mm;

(b) waste glue: cutting into sheet with thickness not more than 10mm by a cutting machine, and feeding the sheet into a crusher to be crushed into particles with maximum size not more than 10 mm;

(c) recovering materials: SIS or SBS of the kind corresponding to the facing layer is added with plasticizer and photosensitizer in proper proportion and mixed homogeneously;

(2) mixing the base material prepared in the step (1) at 90-120 ℃ to form a melt, then pressing and shaping the melt to form a base layer with the thickness of 1-4mm, and cooling and rolling the base layer into a coiled material for later use;

(4) uncoiling the coiled material obtained in the step (3), and heating to enable the surface of the coiled material to have viscosity;

(5) and spreading a melt formed by the surface layer raw material on the surface of the viscous coil to form a surface layer, pressing into a plate with the required thickness of 1-7mm, laminating other layers, cooling and shaping, and cutting into the size required by a user.

8. The method for preparing a photosensitive elastomer of a double-layer structure for a flexographic printing plate according to claim 7, characterized in that: the step (2) is that the base material prepared in the step (1) is sent into an extruder to be mixed into melt at 90-120 ℃, extruded through a flat die head, pressed and shaped into a base layer with the thickness of 1-4mm in a calender, cooled and rolled into a coiled material for standby; and (3) uncoiling the coil obtained in the step (2), preheating by infrared rays to enable the surface of the coil to have viscosity, and feeding the coil into a calender.

9. The method for preparing a photosensitive elastomer of a double-layer structure for a flexographic printing plate according to claim 7, characterized in that: and (4) spreading a melt formed by the surface layer raw material on the surface of the coil with sticky surface to form the surface layer, pressing into a plate with the required thickness of 1-7mm by a calender, laminating other layers, cooling and shaping, and cutting into the size required by a user.

10. A flexographic printing plate characterized by: the printing plate comprises a protective film base (1), a mask (2), a photosensitive elastomer, a bonding layer (5) and a support body (6) from top to bottom in sequence; the photosensitive elastomer is the photosensitive elastomer of any one of claims 1 to 9.

Technical Field

The invention belongs to the technical field of flexographic printing, and particularly relates to a double-layer structure photosensitive elastomer of a flexible photosensitive printing plate, a preparation method of the double-layer structure photosensitive elastomer and the flexible photosensitive printing plate comprising the double-layer structure photosensitive elastomer.

Background

The printing ink such as green and environment-friendly ink, alcohol ink and UV ink is used in the flexographic printing, so that VOC (volatile organic compounds) emission in the printing process is effectively reduced, and the ink layer almost does not contain heavy metal and is healthy and safe. The flexographic plate is generally used for package printing, is particularly suitable for package printing related to life health and safety of daily chemicals, foods, medicines, cosmetics and the like, and is also used for special printing of anti-counterfeiting, transfer printing, securities, electronic components and the like. The flexible plate has high printing endurance, simple and easily combined printing machine, short production period and high labor efficiency, and is valued and popularized by the printing industry.

The flexographic plate is a photosensitive material for printing, and the usage amount of the flexographic plate is larger and larger along with the rapid development of a green printing mode of flexography. Flexographic plates produce waste materials such as off-specification plates or scraps during production, and flexographic plate development also produces a large amount of residue, which is very difficult to handle, and no method for this purpose exists.

The main components of the flexographic plate are elastomers such as SBS or SIS and a mixture of plasticizers and various monomers, and the price of the same area of flexographic plate is about 10 times that of offset printing compared to that of offset printing plate. Therefore, the manufacturing cost of the flexographic plate is effectively reduced, the rapid development of the flexographic printing industry is continuously promoted, and the method is continuously pursued by the people in the industry.

Disclosure of Invention

In order to solve the problems, the invention provides a flexible photosensitive printing plate with a double-layer structure and a preparation method thereof, which utilize waste materials, waste glue or other low-price materials generated from production to use of the flexible printing plate, solve the environmental problem caused by solid waste discharge and do not influence the performance required by the plate material in use.

The object of the invention is achieved in the following way: the utility model provides a bilayer structure sensitization elastomer of flexible sensitization printing plate, sensitization elastomer contains two-layerly, is surface course and basic unit respectively, the raw materials of basic unit is the flexographic plate reclaimed materials.

The surface layer is made of SBS or SIS solid material and photosensitive liquid or regenerated SBS or SIS photosensitive material. The SBS or SIS solid material and the photosensitive liquid which are normally used are the SBS or SIS solid material and the photosensitive liquid which are used for preparing the flexographic plate in the prior art. The base layer uses the recycled materials of the flexible plate, namely SBS or SIS solid materials and photosensitive liquid which can not be used for preparing the flexible plate in the prior art, or materials containing the SBS or SIS solid materials and the photosensitive liquid of the flexible plate.

The regenerated SBS or SIS photosensitive material can be leftover materials generated in plate production, solid materials recovered from developing solution, solid materials which are yellowed and agglomerated after being placed for a long time, and the like.

The recycled flexographic plate material can be waste plate and waste glue or other SBS or SIS photosensitive materials different from the surface layer.

The waste plate is some rejects and waste edges generated in the production of the flexographic plate.

The waste glue is generated during plate making of a plate making company, and more than 90% of the components in the waste glue are the same as those of a flexible plate except for residual solvents.

The recycled materials adopt SIS or SBS of the type corresponding to the surface layer.

The preparation method of the double-layer structure photosensitive elastomer of the flexible photosensitive printing plate comprises the following steps:

(1) the preparation step of the base material includes at least one of the following steps (a), (b), (c):

(a) waste printing: removing the support film and the protective film of the waste plate, and feeding the remaining photosensitive layer into a crusher to be crushed into particles with the maximum size of not more than 10 mm;

(b) waste glue: cutting into sheet with thickness not more than 10mm by a cutting machine, and feeding the sheet into a crusher to be crushed into particles with maximum size not more than 10 mm;

(c) recovering materials: SIS or SBS of the kind corresponding to the facing layer is added with plasticizer and photosensitizer in proper proportion and mixed homogeneously;

(2) mixing the base material prepared in the step (1) at 90-120 ℃ to form a melt, then pressing and shaping the melt to form a base layer with the thickness of 1-4mm, and cooling and rolling the base layer into a coiled material for later use;

(3) uncoiling the coiled material obtained in the step (2), and heating to enable the surface of the coiled material to have viscosity;

(4) and spreading a melt formed by the surface layer raw material on the surface of the viscous coil to form a surface layer, pressing into a plate with the required thickness of 1-7mm, laminating other layers, cooling and shaping, and cutting into the size required by a user.

And (2) feeding the base layer material prepared in the step (1) into an extruder, mixing the base layer material into a melt at 90-120 ℃, extruding the melt through a flat die head, pressing and shaping the melt into a base layer with the thickness of 1-4mm in a calender, cooling and rolling the base layer into a coiled material for later use.

And (3) uncoiling the coil obtained in the step (2), preheating by infrared rays to enable the surface of the coil to have viscosity, and feeding the coil into a calender.

And (4) spreading a melt formed by the surface layer raw material on the surface of the coil with sticky surface to form the surface layer, pressing into a plate with the required thickness of 1-7mm by a calender, laminating other layers, cooling and shaping, and cutting into the size required by a user.

A flexible photosensitive printing plate comprises a protective film base, a mask, a photosensitive elastomer, a bonding layer and a support body from top to bottom in sequence; the photosensitive elastomer is the photosensitive elastomer.

The invention discloses a double-layer structure photosensitive elastomer of a flexible photosensitive printing plate, a preparation method thereof and the flexible photosensitive printing plate comprising the same, which can effectively reduce the manufacturing cost of the flexible printing plate. At present, no flexible photosensitive printing plate containing the double-layer structure photosensitive elastomer is reported all over the world.

The application provides a bilayer structure sensitization elastomer of flexible sensitization galley divide into two-layerly: the first layer is made of recycled materials such as waste plates, waste glue and the like or other low-price materials and becomes the base layer of the flexible plate, and the waste plates are some unqualified products and waste edges generated in the production of the flexible plate. The waste glue is generated during plate making of a plate making company, more than 90% of the components of the waste glue are the same as those of the flexible plate except for residual solvent, and the waste plate and the waste glue cannot be degraded and can only become solid waste to be discharged, so that pressure is brought to environmental protection. The invention can fully utilize the waste plate and the waste glue, not only can reduce the environmental protection pressure, but also can change waste into valuables; the second layer is made of new raw materials and becomes the surface layer of the flexographic plate. The surface layer of the flexible plate takes the tasks of ink transfer and printing, and the surface layer completely adopts new raw materials, so compared with the flexible plate made of the brand-new materials, the flexible plate has no difference in printing. The base layer only plays a role in supporting, is made of recycled materials or low-price materials, is low in cost, and perfectly solves the problem of solid waste discharge.

The photosensitive elastomer with the double-layer structure of the flexible photosensitive printing plate prepared by the method has the advantages that the recycled material of the base layer already contains photosensitive liquid components, and no auxiliary agent is added. The prepared flexible photosensitive printing plate material containing the double-layer structure photosensitive elastomer is flat, and the printing performance after plate making is the same as that of a flexible plate made of a brand new material.

Drawings

FIG. 1 is a schematic cross-sectional view of a two-layer structure flexographic printing plate according to the present invention.

Wherein, 1 is a protective film base; 2 is a mask material; 3 is a facing layer; 4 is a base layer; 5 is a tie layer; and 6 is a support body.

Detailed Description

The invention relates to a material for flexographic printing, in particular to a double-layer structure photosensitive elastomer of a flexible photosensitive printing plate, a preparation method thereof and the flexible photosensitive printing plate containing the same. Specifically, as shown in fig. 1, the photosensitive elastomer of the double-layer structure of the flexographic printing plate comprises two layers, namely a surface layer 3 and a base layer 4, wherein the base layer 4 is produced by a flexographic plate reclaimed material. The flexible photosensitive printing plate containing the double-layer structure photosensitive elastomer sequentially comprises a protective film base 1, a mask 2, the photosensitive elastomer, a bonding layer 5 and a support body 6 from top to bottom.

The surface layer is made of SBS or SIS solid material and photosensitive liquid or regenerated SBS or SIS photosensitive material normally used by the flexographic plate. The SBS or SIS solid material and the photosensitive liquid which are normally used are the SBS or SIS solid material and the photosensitive liquid which are used for preparing the flexographic plate in the prior art. The base layer uses the recycled materials of the flexible plate, namely SBS or SIS solid materials and photosensitive liquid which can not be used for preparing the flexible plate in the prior art, or materials containing the SBS or SIS solid materials and the photosensitive liquid of the flexible plate.

The regenerated SBS or SIS photosensitive material can be leftover materials generated in plate production, solid materials recovered from developing solution, solid materials which are yellowed and agglomerated after being placed for a long time, and the like.

The recycled flexographic plate material can be waste plate and waste glue or other SBS or SIS photosensitive materials different from the surface layer.

The waste plate is some rejects and waste edges generated in the production of the flexographic plate.

The waste glue is generated during plate making of a plate making company, and more than 90% of the components in the waste glue are the same as those of a flexible plate except for residual solvents.

The recycled materials adopt SIS or SBS of the type corresponding to the surface layer.

The preparation method of the double-layer structure photosensitive elastomer of the flexible photosensitive printing plate comprises the following steps:

(1) the preparation step of the base material includes at least one of the following steps (a), (b), (c):

(a) waste printing: removing the support film and the protective film of the waste plate, and feeding the remaining photosensitive layer into a crusher to be crushed into particles with the maximum size of not more than 10 mm;

(b) waste glue: cutting into sheet with thickness not more than 10mm by a cutting machine, and feeding the sheet into a crusher to be crushed into particles with maximum size not more than 10 mm;

(c) recovering materials: SIS or SBS of the kind corresponding to the facing layer is added with plasticizer and photosensitizer in proper proportion and mixed homogeneously;

(2) mixing the base material prepared in the step (1) at 90-120 ℃ to form a melt, then pressing and shaping the melt to form a base layer with the thickness of 1-4mm, and cooling and rolling the base layer into a coiled material for later use;

(3) uncoiling the coiled material obtained in the step (2), and heating to enable the surface of the coiled material to have viscosity;

(4) and spreading a melt formed by the surface layer raw material on the surface of the viscous coil to form a surface layer, pressing into a plate with the required thickness of 1-7mm, laminating other layers, cooling and shaping, and cutting into the size required by a user. Finally, the double-layer flexible photosensitive printing plate is obtained, and the printing use requirements are met.

And (2) feeding the base layer material prepared in the step (1) into an extruder, mixing the base layer material into a melt at 90-120 ℃, extruding the melt through a flat die head, pressing and shaping the melt into a base layer with the thickness of 1-4mm in a calender, cooling and rolling the base layer into a coiled material for later use.

And (4) uncoiling the coil obtained in the step (3), preheating by infrared rays to enable the surface of the coil to have viscosity, and feeding the coil into a calender.

And (5) spreading a melt formed by the surface layer raw material on the surface of a coil with sticky surface to form a surface layer, pressing the surface layer into a plate with the required thickness of 1-7mm by a calender, laminating other layers, cooling and shaping, and cutting into the size required by a user.

The following examples are intended to further illustrate the content of the invention, but do not limit the scope of protection of the invention.

In the present invention, the support 6 of the double-layer structure flexographic printing plate may be a film or a metal sheet, and the support is previously subjected to chemical priming. The adhesive layer 5 of the double-layer structure flexible photosensitive printing plate is a binder composition containing photo-crosslinkable binder, and the binder resin may be at least one of polyurethane acrylic resin copolymer, polyurethane vinyl acetate copolymer, polyurethane vinyl ester/acrylate, and the like. Its manufacturing method is described in patent CN 101144980a, the support and the adhesive layer are laminated together in advance to form the lower film.

In the invention, the photosensitive elastomer of the double-layer structure flexible photosensitive printing plate comprises a base layer 3 and a surface layer 4. The base layer may be at least one of a waste plate, waste gum, or other low cost material that is at least one of an SBS or SIS system. The top layer is made from a new flexographic printing stock, is used for ink transfer and printing tasks, and can be at least one of SBS or SIS systems.

The mask 2 may be one of a laser-ablated black film or an anti-adhesive film. The protective sheet base 1 may be one of a matte or matte base. The protective film base and the mask layer are combined together in advance to form an upper film.

And laminating and compounding the upper and lower films and the photosensitive elastomer to obtain a finished product of the double-layer flexible photosensitive printing plate for later use.

The double-layer structure flexible photosensitive printing plate is subjected to plate making according to a common flexible plate making method, so that a printing plate which can be directly used for flexography can be obtained. By adopting the technology and the preparation method, the invention treats the waste printing plate and leftover materials generated in the production of the flexible printing plate and the waste glue generated by a plate making company, solves the problem of solid waste discharge and relieves pressure for environmental protection. The invention can fully utilize the waste plate and the waste glue, not only can reduce the environmental protection pressure, but also can change waste into valuables. Because the surface layer completely adopts new raw materials, compared with a flexible plate made of completely new materials, the flexible plate has no difference in printing. The plate is made according to a common flexographic plate making method, and the imaging performance of the plate is equivalent to that of a common flexographic plate.

The present invention is described in detail below with reference to specific embodiments, it should be noted that the embodiments are only used for further illustration of the present invention, and should not be construed as limiting the scope of the present invention, and those skilled in the art can make modifications and adaptations of the present invention based on the above-mentioned disclosure.

Example 1

And (3) film preparation: FG125, comprising an adhesive layer (Lekehuaguang Co., Ltd.), 125 μm.

Film coating: red film, 100 μm with mask (Lekehuaguang, Lekehua).

Photosensitive elastomer: 1) 100Kg of R394Q-II waste leftover materials produced by Rogowski Kai Huaguang company for producing flexible plates are removed of a supporting film and a protective film, and the rest photosensitive layer is sent to a crusher to be crushed into particles with the maximum size not larger than 10mm and put into a bin for storage. 2) 60Kg of waste gum generated after R394Q-II platemaking of Zhengzhou Xinhua company is generally a lump, which is cut into sheets with thickness not more than 10mm by a cutting machine, and then the sheets are sent to a crusher to be crushed into particles with maximum size not more than 10mm and put into a storage bin for storage. 3) Mixing the granules obtained in the first step and the second step, feeding into an extruder, mixing at 90-120 deg.C to obtain molten granules, extruding through a flat die, pressing and shaping in a calender to obtain a plate with a thickness of 1.5mm, cooling, and rolling into coiled material. 4) Uncoiling the coil formed in the third step, preheating the coil by infrared rays to make the surface of the coil sticky, and feeding the coil into a calender. Meanwhile, 200Kg of brand-new DX-375 solid material produced by Keteng company is added into an internal mixer for 1 hour at 120 ℃, 50Kg of photosensitive liquid of Lekei Huaguang company R394Q-II is added into the internal mixer for mixing for 30 minutes at 120 ℃, and the melt is extruded by an extruder. According to the production process of the flexographic plate, a melt is flatly laid on the surface of a coil with sticky surface, a lower film is laminated under heating and pressurizing at 120 ℃ and 6MPa, the thickness of the lower film is 3.94mm through pressing by a calender, and the lower film is cut into the size required by a user after cooling and shaping.

Example 2

And (3) film preparation: FG125, comprising an adhesive layer (Lekehuaguang Co., Ltd.), 125 μm.

Film coating: red film, 100 μm with mask (Lekehuaguang, Lekehua).

Photosensitive elastomer: 1) 200Kg of agglomerated SBS solid material (produced by Keteng company, which is an overdue material with poor performance due to too long standing time) is added with 50Kg of photosensitive liquid (containing plasticizer and other additives, not separately) of Lekei Huaguang company R394-II, and the photosensitive liquid is dispersed in a mixer, so that the photosensitive liquid is completely and uniformly dispersed in SBS particles and put in a storage bin for storage. 2) Feeding the granules prepared in the first step into an extruder, mixing the granules into a melt at 120 ℃, extruding the melt through a flat die head, pressing and shaping the melt into a plate material with the thickness of 1.5mm in a calender, cooling the plate material and rolling the plate material into a coil for later use. 3) Uncoiling the coil formed in step 2, preheating with infrared rays to make the surface of the coil sticky, and feeding into a calender. Meanwhile, 200Kg of brand-new DX-325 solid material produced by Keteng company is added into an internal mixer for densification for 1 hour at 120 ℃, 60Kg of photosensitive liquid R394Q-II of Lekei Huaguang company is added into the internal mixer for mixing for 30 minutes at 120 ℃, and the melt is extruded by an extruder. According to the production process of the flexographic plate, a melt is flatly laid on the surface of a coil with sticky surface, a lower film is laminated under heating and pressurizing at 120 ℃ and 6MPa, the thickness of the lower film is 3.94mm through pressing by a calender, and the lower film is cut into the size required by a user after cooling and shaping.

Example 3

And (3) film preparation: FG125, comprising an adhesive layer (Lekehuaguang Co., Ltd.), 125 μm.

Film coating: the black film was laser-ablated and contained a mask (produced by Lekehua Corp.) of 100 μm.

Photosensitive elastomer: photosensitive elastomer: 1) 100Kg of R394Q-II waste leftover materials produced by Rogowski Kai Huaguang company for producing flexible plates are removed of a supporting film and a protective film, and the rest photosensitive layer is sent to a crusher to be crushed into particles with the maximum size not larger than 10mm and put into a bin for storage. 2) 60Kg of waste gum generated after R394Q-II platemaking of Zhengzhou Xinhua company is generally a lump, which is cut into sheets with thickness not more than 10mm by a cutting machine, and then the sheets are sent to a crusher to be crushed into particles with maximum size not more than 10mm and put into a storage bin for storage. 3) Mixing the granules prepared in the first step and the second step, feeding the mixture into an extruder, mixing the mixture into a melt at 90-120 ℃, extruding the melt through a flat die head, pressing and shaping the melt in a calender to form a plate with the thickness of 1.5mm, cooling and rolling the plate into a coil for later use. 4) Uncoiling the coil formed in the third step, preheating the coil by infrared rays to make the surface of the coil sticky, and feeding the coil into a calender. Meanwhile, 200Kg of brand-new DX-375 solid material produced by Keteng company is added into an internal mixer for 1 hour at 120 ℃, 50Kg of photosensitive liquid of Lekei Huaguang company R394Q-II is added into the internal mixer for mixing for 30 minutes at 120 ℃, and the melt is extruded by an extruder. According to the production process of the flexographic plate, a melt is flatly laid on the surface of a coil with sticky surface, a lower film is laminated under heating and pressurizing at 120 ℃ and 6MPa, the thickness of the lower film is 3.94mm through pressing by a calender, and the lower film is cut into the size required by a user after cooling and shaping.

Comparative example 1

And (3) film preparation: FG125, comprising an adhesive layer (Lekehuaguang Co., Ltd.), 125 μm.

Film coating: red film, 100 μm with mask (Lekehuaguang, Lekehua).

Photosensitive elastomer: flexographic plate R394Q-II (produced by Lekei Huaguang Co.).

Comparative example 2

And (3) film preparation: FG125, comprising an adhesive layer (Lekehuaguang Co., Ltd.), 125 μm.

Film coating: the black film was laser-ablated and contained a mask (produced by Lekehua Corp.) of 100 μm.

Photosensitive elastomer: flexographic plate DR394Q-II (produced by Lekei Huaguang, Inc.).

The flexible resin plates obtained in examples 1 to 3 and comparative examples 1 to 2 were subjected to exposure plate making using a CDI Spark 2530 (eskok) laser engraving machine and a KMLS flexible plate making machine (kumao printing service factory, leucorrhea, guangzhou). The flexible photosensitive printing plate with the double-layer structure is evaluated in the plate making performance, such as exposure latitude, resilience, hardness, dot reproduction, minimum independent points, minimum independent lines, relief depth and the like, by using a VIPFLEX334 dot instrument (Jinan Lamangao electromechanical technology, Inc.) and a Shore durometer test. The results are shown in table 1 below:

from the plate making performance of the examples and comparative examples in the above table, the performance in examples 1-3 is comparable or very close to the results in comparative examples 1-2, and can meet the printing requirements.

The above embodiment is a typical method for preparing a flexible photosensitive printing plate with a double-layer structure, and is for the reader to better understand the present invention, and is not a restriction on the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the general concept of the invention, and these should also be considered as the scope of the invention; any changes, substitutions of detail only, and the like which are within the spirit of the disclosure are intended to be within the scope of the invention as those skilled in the art of flexographic printing plate production will recognize.