Packaging paper, preparation method of packaging paper and paper product

Abstract

The invention discloses packaging paper, a preparation method of the packaging paper and a paper product. The packaging paper comprises a paper base layer, a first bonding layer, a first graphic and text information layer, an anti-explosion layer, a second graphic and text information layer and a light-transmitting protective layer, wherein the first bonding layer is arranged on one side of the paper base layer; the first image-text information layer is arranged on one side, deviating from the paper base layer, of the first bonding layer, and the first image-text information layer is provided with a patterned concave-convex structure; the anti-explosion layer is arranged on one side, deviating from the paper base layer, of the first graphic and text information layer, and the anti-explosion layer is made of polyurethane resin; the second graphic and text information layer is arranged on one side, deviating from the paper base layer, of the anti-explosion layer; the light-transmitting protection layer is arranged on the side, away from the paper base layer, of the second image-text information layer According to the embodiment of the invention, the packaging paper provided by the invention is folding-resistant and explosion-proof.

Description

Technical Field

[0001] The present application belongs to the technical field of data processing paper products, and in particular relates to packaging paper, a preparation method of packaging paper, and a paper product. Background Art

[0002] In the prior art, packaging paper is fabricated into boxes of various shapes, which are then used to house products such as electronic products, beverages, and cosmetics. During the packaging paper production process, a plastic film is applied to the paper base to significantly enhance the paper's abrasion resistance, tear resistance, folding resistance, and water resistance.

[0003] However, the plastic film in packaging paper is difficult to degrade and easily accumulates in the environment, leading to plastic pollution. Summary of the Invention

[0004] The embodiments of the present application provide a packaging paper, a method for preparing the packaging paper, and a paper product, which can eliminate the need for plastic film and make the packaging paper fold-resistant and explosion-proof.

[0005] In a first aspect, an embodiment of the present application provides a packaging paper, comprising:

[0006] a paper base layer; a first adhesive layer disposed on one side of the paper base layer;

[0007] A first graphic information layer is provided on a side of the first adhesive layer facing away from the paper base layer, and the first graphic information layer has a patterned concave-convex structure;

[0008] The explosion-proof layer is provided on the side of the first graphic information layer away from the paper base layer, and the material of the explosion-proof layer is polyurethane resin;

[0009] The second graphic information layer is provided on the side of the explosion-proof layer away from the paper base layer;

[0010] The light-transmitting protective layer is arranged on the side of the second graphic information layer facing away from the paper base layer.

[0011] In some embodiments, the light-transmitting protective layer comprises:

[0012] a second protective sublayer, disposed on a side of the second graphic information layer facing away from the paper base layer;

[0013] The first protective sublayer is arranged between the explosion-proof layer and the second protective sublayer. The first protective sublayer has a concave-convex texture. The material of the first protective sublayer is different from that of the second protective sublayer.

[0014] In some embodiments, the orthographic projection of the first protective sublayer on the paper base layer at least partially overlaps with the orthographic projection of the first graphic information layer on the paper base layer.

[0015] In some embodiments, the material of the first protective sub-layer includes a copolymer of an acrylic resin and an acrylic monomer.

[0016] In some embodiments, the material of the second protective sub-layer includes a copolymer of polyurethane acrylic resin, ethoxylated trimethylolpropane triacrylate, and propoxylated neopentyl glycol diacrylate.

[0017] In some embodiments, the first graphic information layer includes:

[0018] A reflective layer is provided on the side of the first adhesive layer facing away from the paper base layer;

[0019] The concave-convex structure layer has patterned concave and convex parts. The concave-convex structure layer is located on the side of the reflective layer away from the paper base layer. At least part of the reflective layer is located in the concave part, and at least part of the reflective layer is located on the side of the convex part close to the paper base layer.

[0020] In some embodiments, the paper substrate comprises:

[0021] First paper base;

[0022] a second adhesive layer, disposed on one side of the first paper base layer;

[0023] The second paper base layer is arranged between the second adhesive layer and the first adhesive layer.

[0024] In some embodiments, the first paper base layer has a grammage of 300 g to 400 g.

[0025] In some embodiments, the second paper base layer has a grammage of 250 g to 350 g.

[0026] In some embodiments, the gram weight of the paper base layer is greater than 650 g, and the thickness of the paper base layer is 0.8-1.0 mm.

[0027] In some embodiments, the packaging paper further comprises:

[0028] The third graphic information layer is arranged on the side of the paper base layer away from the first adhesive layer.

[0029] In a second aspect, an embodiment of the present application provides a method for preparing packaging paper, comprising:

[0030] Taking a release film, and providing a first graphic information layer on the release film, wherein the first graphic information layer has a patterned concave-convex structure;

[0031] Disposing a first adhesive layer on the first graphic information layer and / or the second paper base layer, and bonding the surface of the first graphic information layer facing away from the release film and the second paper base layer via the first adhesive layer;

[0032] Removing the release film attached to the first graphic information layer, and coating the surface of the first graphic information layer away from the second paper base with a polyurethane modified emulsion, and allowing the polyurethane modified emulsion to mature to form an anti-explosion layer;

[0033] Taking a first paper base layer, providing a second adhesive layer on the surface of the first paper base layer and / or the second paper base layer away from the explosion-proof layer, and bonding the surfaces of the first paper base layer and the second paper base layer away from the explosion-proof layer via the second adhesive layer;

[0034] A second graphic information layer and a light-transmitting protective material layer are sequentially arranged on the surface of the explosion-proof layer away from the first graphic information layer, and the light-transmitting protective material layer is cured to form a light-transmitting protective layer.

[0035] In some embodiments, a release film is taken and a first graphic information layer is provided on the release film, including:

[0036] Taking out the release film, and setting a photoresist material layer on the release film;

[0037] Performing a film pressing process on the photoresist material layer to obtain a concave-convex structure layer having patterned concave portions and convex portions;

[0038] A reflective material is evaporated on the concave-convex structure layer to form a reflective layer. At least part of the reflective layer is located in the concave portion and at least part of the reflective layer is located on the side of the convex portion facing away from the release film.

[0039] In some embodiments, a second graphic information layer and a light-transmitting protective material layer are sequentially provided on a surface of the explosion-proof layer away from the first graphic information layer, and the light-transmitting protective material layer is cured to form the light-transmitting protective layer, including:

[0040] An explosion-proof base oil and an explosion-proof surface oil are sequentially provided on the surface of the explosion-proof layer away from the first graphic information layer. The explosion-proof base oil is cured to form a first protective sublayer having a concave-convex texture, and the explosion-proof surface oil forms a second protective sublayer.

[0041] In some embodiments, the coverage of the polyurethane modified emulsion is 4 to 8 g / m 2 .

[0042] In some embodiments, the coverage of the explosion-proof primer is 3 to 6 g / m 2 .

[0043] In some embodiments, the coverage of the explosion-proof surface oil is 3 to 5 g / m 2 .

[0044] In some embodiments, the explosion-proof primer comprises 10-40% acrylate resin and 10-40% acrylic monomer, by weight.

[0045] In some embodiments, the explosion-proof base oil includes, by weight percentage, polyurethane acrylic resin 30-50%, 4-(2-acetoxyethoxy) benzophenone 2-7%, ethoxylated trimethylolpropane triacrylate 15-30%, propoxylated neopentyl glycol diacrylate 15-30%, and auxiliary agent 0.2-1%.

[0046] In some embodiments, the polyurethane modified emulsion includes, by weight percentage, acrylic resin and water.

[0047] In a third aspect, the embodiments of the present application provide a paper product, including the packaging paper provided in the first aspect, or the packaging paper prepared by the preparation method of the packaging paper provided in the first aspect.

[0048] The packaging paper, the preparation method of the packaging paper, and the paper product provided by the embodiments of the present application can save the plastic film and improve the scratch resistance, wear resistance, and explosion-proof performance of the packaging paper by arranging the anti-explosion layer and the light-transmitting protective layer; the paper base layer can be prepared in advance, and then the first graphic information layer is bonded with the first adhesive layer and the first graphic information layer, so that the first graphic information layer is formed on the high-grammage paper base layer; the first graphic information layer has a patterned concave-convex structure, so that the packaging paper has special effects such as wrinkles, frosted glass, and light-refracting lines, which is beneficial to enrich the appearance of the packaging paper; the first graphic information layer, the anti-explosion layer, and the second graphic information layer are arranged in layers, so that the anti-explosion layer has the effect of flattening the first graphic information layer, which is beneficial to the formation of the second graphic information layer and avoids or reduces the explosion of the second graphic information layer. BRIEF DESCRIPTION OF DRAWINGS

[0049] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced as follows. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0050] Figure 1 is a partial cross-sectional structure schematic diagram of the packaging paper provided by an embodiment of the present application;

[0051] Figure 2 is a partial cross-sectional structure schematic diagram of the packaging paper provided by an embodiment of the present application;

[0052] Figure 3 is a partial cross-sectional structure schematic diagram of the packaging paper provided by an embodiment of the present application;

[0053] Figure 4 is a partial flow schematic diagram in the preparation method of the packaging paper provided by an embodiment of the present application;

[0054] Figure 5 This is a partial flow diagram of a method for preparing packaging paper provided in one embodiment of the present application;

[0055] Figure 6 This is a partial flow diagram of a method for preparing packaging paper provided in one embodiment of the present application;

[0056] Figure 7 This is a partial flow diagram of a method for preparing packaging paper provided in one embodiment of the present application;

[0057] Figure 8 This is a partial flow diagram of a method for preparing packaging paper provided in one embodiment of the present application;

[0058] Figure 9 This is a partial flow diagram of a method for preparing packaging paper provided in one embodiment of the present application;

[0059] Figure 10 This is a partial flow diagram of a method for preparing packaging paper provided in one embodiment of the present application;

[0060] Figure 11 This is a partial flow diagram of a method for preparing packaging paper provided in one embodiment of the present application.

[0061] Description of reference numerals:

[0062] 1. Paper base layer; 11. First paper base layer; 12. Second adhesive layer; 13. Second paper base layer;

[0063] 2. First adhesive layer;

[0064] 3. First graphic information layer; 31. Reflective layer; 32. Concave-convex structure layer; 321. Concave portion; 322. Concave portion;

[0065] 4. Anti-explosion layer;

[0066] 5. Second graphic information layer;

[0067] 6. Light-transmitting protective layer; 61. First protective sublayer; 62. Second protective sublayer;

[0068] 7. The third graphic information layer;

[0069] 201, release film; 202, release material layer; 203, photoresist film pressing plate; 320, photoresist material layer;

[0070] X, first direction. DETAILED DESCRIPTION

[0071] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is merely to provide a better understanding of the present application by illustrating the examples of the present application.

[0072] It should be noted that, in this document, relational terms such as second and third are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0073] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The embodiments will be described in detail below with reference to the accompanying drawings.

[0074] In order to solve the problems in the prior art, the embodiments of the present application provide a packaging paper, a method for preparing the packaging paper, and a paper product. The packaging paper provided in the embodiments of the present application is first introduced below.

[0075] Figure 1 A schematic diagram of a partial cross-sectional structure of packaging paper provided in one embodiment of the present application is shown. The packaging paper comprises: a paper base 1, a first adhesive layer 2, a first graphic information layer 3, an explosion-proof layer 4, a second graphic information layer 5, and a light-transmitting protective layer 6. The first adhesive layer 2 is disposed on one side of the paper base 1; the first graphic information layer 3 is disposed on the side of the first adhesive layer 2 facing away from the paper base 1 and has a patterned concave-convex structure; the explosion-proof layer 4 is disposed on the side of the first graphic information layer 3 facing away from the paper base 1 and is made of polyurethane resin; the second graphic information layer 5 is disposed on the side of the explosion-proof layer 4 facing away from the paper base 1; and the light-transmitting protective layer 6 is disposed on the side of the second graphic information layer 5 facing away from the paper base 1.

[0076] Packaging paper can be used to make various packaging containers, boxes and bags, etc. The packaging paper has sufficient thickness so that the packaging paper can protect the goods and facilitate transportation and display.

[0077] The paper base layer 1, first adhesive layer 2, first graphic information layer 3, explosion-proof layer 4, second graphic information layer 5, and light-transmitting protective layer 6 can be stacked sequentially along a first direction X. The paper base layer 1 can be a single paper base or a composite paper base. A single paper base is a single layer of paper made from pulp. A composite paper base is a composite of at least two single paper base layers. Optionally, the single paper base has a grammage of 250g to 400g. The grammage of any single paper base in the composite paper base is 250g to 400g. Increasing the grammage of the paper base layer 1 ensures that the packaging paper produced using the paper base layer 1 is strong, resistant to pressure, and has good load-bearing capacity.

[0078] The first adhesive layer 2 is made of an adhesive material and is used to bond the paper base layer 1 and the first graphic information layer 3. The first adhesive layer 2 can be made of polyvinyl alcohol (PVA), polyvinyl acetate (PVAc), acrylic acid or other materials.

[0079] The first graphic information layer 3 has a patterned concave-convex structure, and the patterned concave-convex structure forms desired patterns, characters, etc. The user can obtain the patterns and characters presented on the first graphic information layer 3 by observing the packaging paper.

[0080] The explosion-proof layer 4 is positioned on the side of the first graphic information layer 3 facing away from the paper base layer 1. In packaging paper, the explosion-proof layer 4 enhances the paper's impact resistance, puncture resistance, and burst resistance, ensuring that the packaged goods are not damaged during transportation, stacking, or external pressure. The explosion-proof layer 4 also improves the paper's explosion resistance when folded. The material of this layer includes polyurethane resin, which has excellent adhesive properties, ensuring strong adhesion of the explosion-proof layer 4 to the first graphic information layer 3. Polyurethane resin is also resistant to low temperatures, oils and fats, and aging, making the resulting packaging paper durable.

[0081] The second graphic information layer 5 may include flattened printed graphic information. The second graphic information layer 5 may be printed on the entire surface or on a partial area of ​​the explosion-proof layer 4.

[0082] The light-transmitting protective layer 6 is made of a light-transmitting material. Preferably, the material used to prepare the light-transmitting protective layer 6 includes a resin and a photoinitiator, which is cured under ultraviolet light to form the light-transmitting protective layer 6. Optionally, the wavelength of the reaction light wave corresponding to the photoinitiator is 365nm to 405nm. Optionally, the light-transmitting protective layer 6 is made of a long-chain resin with a relatively high molecular weight.

[0083] The light-transmitting protective layer 6 exhibits excellent explosion-proof properties, excellent flexibility, wear resistance, low odor, yellowing resistance, and sun resistance. Positioned on the surface of the packaging paper, the light-transmitting protective layer 6 allows external light to penetrate the second graphic information layer 5 and the first graphic information layer 3. This layer protects the second graphic information layer 5, minimizing its shedding and aging. It also reduces or prevents scratches on the packaging paper, improving its wear resistance.

[0084] In the present application, by arranging the explosion-proof layer 4 and the light-transmitting protective layer 6, the packaging paper can omit the plastic film, improve the environmental protection performance of the packaging paper, and improve the scratch-resistant, wear-resistant and explosion-proof performance of the packaging paper; by arranging the paper base layer 1 and the first adhesive layer 2, the paper base layer 1 can be prepared in advance, and then the first adhesive layer 2 and the first graphic information layer 3 are bonded, which is conducive to forming the first graphic information layer 3 on the high-weight paper base layer 1; the first graphic information layer 3 has a patterned concave-convex structure, so that the packaging paper has special effects such as wrinkles, frosting, and refraction patterns, which is conducive to enriching the appearance of the packaging paper; by arranging the first graphic information layer 3, the explosion-proof layer 4, and the second graphic information layer 5, the explosion-proof layer 4 has the function of flattening the first graphic information layer 3, which is conducive to the formation of the second graphic information layer 5, and avoids or reduces the bursting of the second graphic information layer 5.

[0085] See also Figure 2 In some embodiments, the light-transmitting protective layer 6 includes a first protective sublayer 61 and a second protective sublayer 62. The second protective sublayer 62 is arranged on the side of the second graphic information layer 5 away from the paper base layer 1; the first protective sublayer 61 is arranged between the explosion-proof layer 4 and the second protective sublayer 62, and the first protective sublayer 61 has a concave-convex texture.

[0086] Both the first protective sublayer 61 and the second protective sublayer 62 enhance the wear and scratch resistance of the packaging paper. When preparing the packaging paper, the first protective sublayer 61 can be applied to one side of the already prepared second graphic information layer 5, followed by the second protective sublayer 62. The first protective sublayer 61 prevents bubbles or cracks in the second protective sublayer 62 during the curing process. The first protective sublayer 61 has a concave-convex texture, enriching the packaging paper's appearance.

[0087] Optionally, the solidification rate of the explosion-proof base oil used to prepare the first protective sublayer 61 is greater than the solidification rate of the explosion-proof surface oil used to prepare the second protective sublayer 62, so that after the explosion-proof base oil is set, the explosion-proof surface oil can be set quickly, thereby improving preparation efficiency.

[0088] In some embodiments, the orthographic projection of the first protective sublayer 61 on the paper base layer 1 at least partially overlaps with the orthographic projection of the first graphic information layer 3 on the paper base layer 1 .

[0089] When preparing packaging paper, a first protective sublayer 61 may be provided in the area where the first graphic information layer 3 is distributed. The concave-convex texture on the first protective sublayer 61 may cooperate with the first graphic information layer 3 to achieve a special graphic effect.

[0090] In some embodiments, the coating amount of the explosion-proof primer on the first graphic information layer 3 for preparing the first protective sub-layer 61 is determined according to the depth and density of the concave-convex texture to be prepared. Optionally, the coating amount of the explosion-proof primer on the first graphic information layer 3 is 3 to 6 g / m 2 Optionally, an explosion-proof primer is applied by printing.

[0091] In some embodiments, the explosion-proof surface oil used to prepare the second protective sub-layer 62 is disposed entirely on one side of the paper base 1, and a portion of the second protective sub-layer 62 is in contact with the second graphic information layer 5. Optionally, the coating amount of the explosion-proof surface oil on the second graphic information layer 5 is 3 to 5 g / m 2 .

[0092] See also Figure 3 In some embodiments, the orthographic projection of the first protective sublayer 61 on the paper base layer 1 partially overlaps with the orthographic projection of the second graphic information layer 5 on the paper base layer 1. The second graphic information layer 5 is distributed in a portion of the explosion-proof layer 4. The subsequently prepared first protective sublayer 61 can cover the second graphic information layer 5 or be disposed in an area of ​​the explosion-proof layer 4 not blocked by the second graphic information layer 5.

[0093] In some embodiments, the material of the first protection sub-layer 61 includes a copolymer of acrylic resin and acrylic monomer.

[0094] In some embodiments, the material of the second protective sub-layer 62 includes a copolymer of polyurethane acrylic resin, ethoxylated trimethylolpropane triacrylate, and propoxylated neopentyl glycol diacrylate.

[0095] In some embodiments, the first graphic information layer 3 includes a reflective layer 31 and a concave-convex structure layer 32. The reflective layer 31 is arranged on the side of the first adhesive layer 2 facing away from the paper base layer 1; the concave-convex structure layer 32 has patterned concave portions 321 and convex portions 322. The concave-convex structure layer 32 is located on the side of the reflective layer 31 facing away from the paper base layer 1, at least part of the reflective layer 31 is located in the concave portion 321, and at least part of the reflective layer 31 is located on the side of the convex portion 322 close to the paper base layer 1.

[0096] The reflective layer 31 is made of a material with high reflectivity, so that light entering the reflective layer 31 from the second protective sublayer 62 is fully or partially reflected by the reflective layer 31. The reflective layer 31 is disposed on the concave-convex structure layer 32, and the two together present a glossy pattern or text. Optionally, the reflective layer 31 is made of at least one of aluminum and an aluminum alloy.

[0097] The concave-convex structure layer 32 can be made of a photosensitive resin. The patterned concave portions 321 and convex portions 322 in the concave-convex structure layer 32 can create three-dimensional effects such as relief and depression. When preparing packaging paper, a release film is removed and a photosensitive resin is placed on the release film. A photoresist plate with a preset pattern is used to perform positioning and molding on the surface of the photosensitive resin. The photosensitive resin cures under light to form the concave-convex structure layer 32. A high-reflectivity material is then evaporated onto the concave-convex structure layer 32 to produce the reflective layer 31.

[0098] In some embodiments, the paper base layer 1 includes a first paper base layer 11 , a second adhesive layer 12 and a second paper base layer 13 . The second adhesive layer 12 is disposed on one side of the first paper base layer 11 ; the second paper base layer 13 is disposed between the second adhesive layer 12 and the first adhesive layer 2 .

[0099] The second adhesive layer 12 bonds the first paper base layer 11 and the second paper base layer 13, giving the paper base layer 1 a high grammage. Optionally, the grammage of the first paper base layer 11 is 300g to 400g. Optionally, the grammage of the second paper base layer 13 is 250g to 350g. Optionally, the grammage of the paper base layer 1 is greater than 650g, and the thickness of the paper base layer 1 is 0.8 to 1.0mm. The paper base layer 1 can be composed of a single paper base or multiple layers of paper bases laminated together to achieve a grammage greater than 650g.

[0100] In some embodiments, the first paper base layer 11 can be made of white cardboard to create a silvery effect. White cardboard can be gray-based or white-based. The second paper base layer 13 can be made of face paper. Face paper has a flexible, smooth surface, high whiteness, and good printability, which facilitates the lamination of the second paper base layer 13 with the first graphic information layer 3. Optionally, the second paper base layer 13 is a single-layer structure. Optionally, the second paper base layer 13 is a composite structure.

[0101] In some embodiments, the packaging paper further includes a third graphic information layer 7 , which is disposed on the side of the paper base layer 1 facing away from the first adhesive layer 2 .

[0102] When using packaging paper to create a paper product with a storage space, the surface with the third graphic information layer 7 can be set as the inner surface of the paper product, and the surface with the light-transmitting protective layer 6 can be set as the outer surface of the paper product. By providing the third graphic information layer 7, graphic information can be displayed on both sides of the packaging paper.

[0103] In a second aspect, the present application further provides a method for preparing packaging paper, comprising:

[0104] S100, taking a release film and providing a first graphic information layer on the release film, wherein the first graphic information layer has a patterned concave-convex structure;

[0105] S200, providing a first adhesive layer on the first graphic information layer and / or the second paper base layer, and bonding the surface of the first graphic information layer facing away from the release film and the second paper base layer via the first adhesive layer;

[0106] S300, removing the release film attached to the first graphic information layer, and coating a polyurethane modified emulsion on the surface of the first graphic information layer facing away from the second paper base layer, and curing the polyurethane modified emulsion to form an anti-explosion layer;

[0107] S400, taking a first paper base layer, providing a second adhesive layer on the surface of the first paper base layer and / or the second paper base layer facing away from the explosion-proof layer, and bonding the first paper base layer and the second paper base layer facing away from the explosion-proof layer via the second adhesive layer;

[0108] S500 , sequentially disposing a second graphic information layer and a light-transmitting protective material layer on a surface of the explosion-proof layer away from the first graphic information layer, and curing the light-transmitting protective material layer to form a light-transmitting protective layer.

[0109] See also Figure 4 In S100, the release film 201 and the first graphic information layer 3 prepared thereon can be peeled off, thereby facilitating the transfer of the prepared first graphic information layer 3. Optionally, the release film 201 is a PET film coated with a transfer release material.

[0110] See also Figure 7 In S200, a first adhesive layer 2 can be provided on at least one of the first graphic information layer 3 and the second paper base layer 13, and the one provided with the first adhesive layer 2 is adhered to the other to obtain a first laminated structure in which a release film 201, a first graphic information layer 3, a first adhesive layer 2 and a second paper base layer 13 are stacked in sequence.

[0111] See also Figure 8 , removing the release film 201 attached to the first graphic information layer 3. S300 may also include: after the polyurethane-modified emulsion is cured, obtaining a second laminated structure in which the second paper base layer 13, the first adhesive layer 2, the first graphic information layer 3, and the explosion-proof layer 4 are sequentially stacked. This second laminated structure is wound into a roll and placed under a predetermined environment for curing to optimize the performance of each material layer and ensure that the performance of each material layer reaches a stable state. The cured second laminated structure is then cut into pieces to obtain printing paper of the desired size.

[0112] See also Figure 10 In some embodiments, before S400, the third graphic information layer 7 can be formed on the first paper base layer 11. Then, the surface of the first paper base layer 11 facing away from the third graphic information 7 is aligned with the surface of the second paper base layer 13 facing away from the explosion-proof layer 4 and laminated. This allows the preparation of the first paper base layer 11 and the third graphic information layer 7 to be performed simultaneously with the preparation of the second paper base layer 13 and the first graphic information layer 3, thereby improving production efficiency.

[0113] In other embodiments, after S400, the third graphic information layer 7 may be provided on the surface of the first paper base layer 11 facing away from the second paper base layer 13. Thus, the first paper base layer 11 and the second paper base layer 13 are first laminated, and then the third graphic information layer 7 is prepared.

[0114] In some embodiments, S100 includes:

[0115] S110, taking a release film and providing a photoresist material layer on the release film;

[0116] S120, performing a film pressing process on the photoresist material layer to obtain a concave-convex structure layer, wherein the concave-convex structure layer has patterned concave portions and convex portions;

[0117] S130 , vapor-depositing a reflective material on the concave-convex structure layer to form a reflective layer. At least a portion of the reflective layer is located in the concave portion, and at least a portion of the reflective layer is located on a side of the convex portion facing away from the release film.

[0118] The photoresist material layer may include a photosensitive resin and a photoinitiator. Under the action of ultraviolet light, the photoinitiator initiates the polymerization, cross-linking and curing of the photosensitive resin. Figure 4 In S110, a release film 201 is taken, a release material layer 202 is placed on the release film 201, and a photoresist layer 320 is placed on the release material layer 202. The photoresist layer 320 is not solidified. In S120, a photoresist plate 203 carrying preset graphic information is used to position and mold the unsolidified photoresist layer 320. Figure 5 Under the action of ultraviolet light, the photoresist material layer 320 is cured and forms concave portions 321 and convex portions 322 corresponding to the preset graphic information on the photoresist film pressing plate 203 .

[0119] See also Figure 6 In S130, aluminum and / or aluminum alloy may be evaporated onto the concave-convex structure layer 32 to prepare a reflective layer 31. The reflective layer 31 is evenly distributed on the concave-convex structure layer 32, such that part of the reflective layer 31 is located in the concave portion 321 and part is located on the convex portion 322.

[0120] See also Figure 7 In S200, a first laminated structure is obtained in which the release film 201, the first graphic information layer 3, the first adhesive layer 2 and the second paper base layer 13 are laminated in sequence. Figure 8 , remove the release film 201 attached to the first graphic information layer 3. Figure 9 In S300, a second laminated structure is obtained in which the second paper base layer 13, the first adhesive layer 2, the first graphic information layer 3 and the explosion-proof layer 4 are sequentially stacked. Figure 10In S400 , a third graphic information layer 7 is disposed on the first paper base layer 11 , and a second adhesive layer 12 is disposed on the first paper base layer 11 , and the first paper base layer 11 and the second paper base layer 13 are bonded to the surface facing away from the anti-explosion layer 4 through the second adhesive layer 12 .

[0121] In some embodiments, S300 includes:

[0122] S310, printing a second graphic information layer on a surface of the explosion-proof layer away from the first graphic information layer;

[0123] S320, sequentially applying explosion-proof base oil and explosion-proof surface oil on the surface of the explosion-proof layer away from the first graphic information layer, the explosion-proof base oil solidifies to form a first protective sublayer having a concave-convex texture, and the explosion-proof surface oil forms a second protective sublayer.

[0124] See also Figure 11 In S310 , the second graphic information layer 5 can be provided on the entire surface or in a partial area of ​​the explosion-proof layer 4 .

[0125] In S320, explosion-proof primer can be applied to the area on the anti-explosion layer corresponding to the concave-convex structure layer 32 first, and then explosion-proof surface oil can be applied to the entire surface. Part of the second protective sublayer 62 formed by the explosion-proof surface oil is in contact with the second graphic information layer 5, and the other part is in contact with the explosion-proof primer and the anti-explosion layer.

[0126] In some embodiments, the amount of explosion-proof primer applied to the first graphic information layer 3 for preparing the first protective sublayer 61 is determined based on the depth and density of the desired concave-convex texture. Optionally, the amount of explosion-proof primer applied to the first graphic information layer 3 is 3 to 6 g / m2. Optionally, the explosion-proof primer is applied by printing. Optionally, the amount of explosion-proof topcoat applied to the second graphic information layer 5 is 3 to 5 g / m2. Optionally, the coverage of the polyurethane modified emulsion is 4 to 8 g / m2. 2 .

[0127] In some embodiments, the explosion-proof primer comprises 10-40% of acrylic resin and 10-40% of acrylic monomer, by weight.

[0128] Acrylic resin is the film-forming substance in the explosion-proof primer. It provides the skeleton structure for the first protective sublayer 61 and determines its basic hardness, adhesion, and flexibility. It promotes close bonding between the first protective sublayer 61 and adjacent film layers, preventing cracking. Acrylic monomers can also adjust the flexibility of the explosion-proof primer, enhancing the hardness, wear resistance, and chemical resistance of the first protective sublayer 61.

[0129] Optionally, the explosion-proof primer includes, by weight percentage, 10-40% of acrylic resin (DAP), 10-30% of trimethylolpropane triacrylate, 0-10% of ethoxylated trimethylolpropane triacrylate, 0-10% of 3-methylbenzophenone, 0-10% of diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide, 0-10% of 2,4-diethylthioxanthone, 0-2% of wax, 0-2% of additives, and 0-20% of inorganic filler.

[0130] Among them, trimethylolpropane triacrylate (DTMPTA) is a high-functionality cross-linking agent, which improves the curing speed and cross-linking density, and enhances the hardness, wear resistance and chemical resistance of the first protective sub-layer 61 .

[0131] Ethoxylated trimethylolpropane triacrylate (EOMPTA) is a flexibility modifier that introduces flexible segments to mitigate the rigidity of DTMPTA, preventing the first protective sublayer 61 from bending and cracking due to excessive brittleness. It also reduces volume shrinkage during curing of the explosion-proof primer, preventing cracking in the first protective sublayer 61.

[0132] 3-Methylbenzophenone is a photoinitiator that can generate active free radicals after absorbing light energy and initiate the polymerization of acrylate double bonds.

[0133] Diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide (TPO) is a photoinitiator and has a low yellowing property, which can reduce the color change of the first protective sublayer 61 after curing.

[0134] 2,4-Diethylthioxanthone (DETX) is a photoinitiator used in conjunction with amine co-initiators to enhance the response efficiency of explosion-proof primer to medium-wavelength light waves and make up for the wavelength blind spot of other photoinitiators.

[0135] The wax has a lubricating effect, can reduce the friction coefficient, improve the smoothness and anti-adhesion properties of the first protective sub-layer 61, and keep the explosion-proof base oil system uniform.

[0136] Additives may include leveling agents, defoaming agents, dispersants, etc.

[0137] The inorganic filler may include calcium carbonate, talc, etc. The inorganic filler may improve the hardness and compression resistance of the first protective sublayer 61 .

[0138] The multifunctional monomer (DTMPTA) and the composite photoinitiator (TPO+DETX+methyl benzophenone) are used to achieve simultaneous curing of the top and bottom layers; the DAP resin and the flexible EOMPTA monomer work together to prevent the first protective sublayer 61 from being too hard and causing cracking.

[0139] In some embodiments, the explosion-proof surface oil includes, by weight percentage, 30-50% of polyurethane acrylic resin, 2-7% of 4-(2-acetoxyethoxy) benzophenone, 15-30% of ethoxylated trimethylolpropane triacrylate, 15-30% of propoxylated neopentyl glycol diacrylate, and 0.2-1% of an additive.

[0140] Under ultraviolet light, the acrylate double bonds in the polyurethane acrylic resin participate in a cross-linking reaction, forming a dense network structure. The polyurethane acrylic resin is the primary film-forming substance of the second protective sublayer 62, imparting flexibility, adhesion, wear resistance, and chemical resistance to the second protective sublayer 62.

[0141] 4-(2-acetoxyethoxy)benzophenone is a photoinitiator, which is used to generate active free radicals after absorbing light energy to initiate the polymerization reaction of acrylate monomers.

[0142] Ethoxylated trimethylolpropane triacrylate (EOMPTA) is a flexibility regulator that reduces the viscosity of the explosion-proof surface oil and improves workability. It also participates in the cross-linking reaction and enhances the hardness, scratch resistance, and heat resistance of the second protective sublayer 62 .

[0143] Neopentyl glycol propoxylate is a reactive diluent used to adjust the rheological properties of the explosion-proof surface oil, balance the hardness and impact resistance of the second protective sublayer 62, and prevent brittle cracking.

[0144] Additives may include leveling agents, defoaming agents, dispersants, etc.

[0145] Polyurethane acrylic resin and acrylate monomers jointly construct a cross-linked curing network, photoinitiators ensure efficient curing, and additives optimize process performance.

[0146] In some embodiments, the polyurethane modified emulsion includes, by weight percentage, an acrylic resin and water.

[0147] Optionally, the polyurethane modified emulsion includes 43-58% of acrylic resin aqueous solution, 5-9% of auxiliary agent and 28-42% of water in percentage by weight. The auxiliary agent may include a leveling agent, a defoaming agent, a dispersant and the like.

[0148] In a third aspect, a paper product is also provided, comprising the packaging paper as described above, or the packaging paper prepared by the method for preparing the packaging paper as described above.

[0149] The paper product can be a gift box, a cigarette box, a medicine box, a cosmetic box, a transport box, a paper bag, a paper cup, a wrapping paper, a greeting card, etc. Alternatively, the gift box can be used to place goods such as wine bottles, wine utensils, food, precious metals, etc.

[0150] The beneficial effects of the packaging paper provided in this application are verified below.

[0151] Experimental Example 1

[0152] Take a PET film, and sequentially coat the release material and the photosensitive material on the PET film;

[0153] A photoresist plate carrying preset graphic information is used to positionally mold an uncured photosensitive material. Under the action of ultraviolet light, the photosensitive material is cured to form a first graphic information layer. The first graphic information layer has a concave-convex structure corresponding to the preset graphic information on the photoresist plate.

[0154] Vapor-depositing aluminum onto the concave-convex structure to prepare a reflective layer;

[0155] Coating the first adhesive material on the reflective layer, taking 300g of facial tissue as the second paper base, and compounding the reflective layer and facial tissue with the first adhesive material;

[0156] Remove the PET film and apply polyurethane modified emulsion on the first graphic information layer. The coating amount of polyurethane modified emulsion is 6g / m 2 , after being rolled and aged, it is cut into printing paper, and the polyurethane modified emulsion forms an anti-explosion layer;

[0157] Take 250g white cardboard as the first paper base, apply the second adhesive material on the white cardboard, and laminate the white cardboard and the face paper through the second adhesive material;

[0158] Printing a second graphic information layer on the surface of the explosion-proof layer away from the first graphic information layer;

[0159] On the surface of the explosion-proof layer away from the first graphic information layer, explosion-proof base oil and explosion-proof surface oil are applied in sequence. The explosion-proof base oil solidifies to form the first protective sub-layer with a concave-convex texture, and the explosion-proof surface oil forms the second protective sub-layer. The explosion-proof base oil coating amount is 4g / m 2 The explosion-proof base oil includes 35% acrylic resin (DAP), 25% trimethylolpropane triacrylate, 8% ethoxylated trimethylolpropane triacrylate, 8% 3-methylbenzophenone, 8% diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide, 8% 2,4-diethylthioxanthone, 1% wax, 1% additive, and 6% inorganic filler. The explosion-proof top oil coating amount is 4g / m 2 , calculated by weight percentage, the explosion-proof primer includes 44.5% polyurethane acrylic resin, 5% 4-(2-acetoxyethoxy) benzophenone, 20% ethoxylated trimethylolpropane triacrylate, 30% propoxylated neopentyl glycol diacrylate, and 0.5% additives.

[0160] Experimental Example 2

[0161] The difference from Example 1 is that the first paper base layer adopts white cardboard with a grammage of 350g, and the second paper base layer adopts white cardboard with a grammage of 300g.

[0162] Experimental Example 3

[0163] The difference from Example 1 is that the first paper base layer is made of 400g white cardboard, and the second paper base layer is made of 350g white cardboard.

[0164] Experimental Example 4

[0165] The difference from Example 1 is that the first adhesive material is applied on the reflective layer, 400g of facial tissue paper is taken, and the reflective layer and facial tissue paper are laminated with the first adhesive material; the PET film is removed, and the polyurethane modified emulsion is applied on the first graphic information layer, and the coating amount of the polyurethane modified emulsion is 6g / m 2 After being rolled and matured, it is cut into printing paper. The polyurethane modified emulsion forms an explosion-proof layer, and the surface of the explosion-proof layer away from the first graphic information layer is coated with explosion-proof primer and explosion-proof surface oil in sequence.

[0166] Experimental Example 5

[0167] The difference from Example 1 is that the coating amount of the polyurethane modified emulsion forming the explosion-proof layer is 4g / m 2 .

[0168] Experimental Example 6

[0169] The difference from Example 1 is that the coating amount of the polyurethane modified emulsion forming the explosion-proof layer is 8g / m 2 .

[0170] Experimental Example 7

[0171] The difference from Example 1 is that the coating amount of the explosion-proof primer forming the first protective sub-layer is 3g / m 2 .

[0172] Experimental Example 8

[0173] The difference from Example 1 is that the coating amount of the explosion-proof primer forming the first protective sub-layer is 6 g / m 2 .

[0174] Experimental Example 9

[0175] The difference from Example 1 is that the coating amount of the explosion-proof surface oil forming the second protective sub-layer is 3g / m 2 .

[0176] Experimental Example 10

[0177] The difference from Example 1 is that the coating amount of the explosion-proof surface oil forming the second protective sub-layer is 5g / m 2 .

[0178] Comparative Example 1

[0179] The difference from Example 1 is that no polyurethane modified emulsion is provided, and the second graphic information layer is printed on the surface of the first graphic information layer.

[0180] Comparative Example 2

[0181] The difference from Example 1 is that the coating amount of the polyurethane modified emulsion forming the explosion-proof layer is 3g / m 2 .

[0182] Comparative Example 3

[0183] The difference from Example 1 is that no explosion-proof base oil is provided, and an explosion-proof surface oil is applied on the surface of the explosion-proof layer away from the first graphic information layer.

[0184] Comparative Example 4

[0185] The difference from Example 1 is that the coating amount of the explosion-proof primer forming the first protective sub-layer is 2g / m 2 .

[0186] Comparative Example 5

[0187] The difference from Example 1 is that no explosion-proof surface oil is provided, and an explosion-proof base oil is applied on the surface of the explosion-proof layer away from the first graphic information layer.

[0188] Comparative Example 6

[0189] The difference from Example 1 is that the coating amount of the explosion-proof surface oil forming the second protective sub-layer is 2g / m 2 .

[0190] The following performance tests were performed on the packaging papers prepared in Experimental Examples 1 to 10 and Comparative Examples 1 to 6.

[0191] 1. Folding and explosion-proof performance test

[0192] Fold the packaging paper 180° twice along the fold line toward the protective layer, and observe visually at a distance of 400mm under a 20x magnifying glass to record whether the packaging paper has cracked.

[0193] If no bursting occurs, fold the packaging paper five times again according to the above operation. Divide the packaging paper into 10 sections with equal distances along the length of the indentation line. Visually inspect the paper at a distance of 400 mm and under a 20x magnifying glass. The degree of damage and bursting of the indentation line in each section is classified into 7 levels according to the following table. The average of the bursting degrees of the ten sections of the finished product corresponding to each embodiment is calculated and recorded as the bursting grade. The smaller the bursting grade value, the less damage.

[0194] Indentation damage Bursting grade No crack observed at 400 mm distance, no crack observed under magnifying glass 1 No crack observed at 400 mm distance, crack observed under magnifying glass 2 Crack observed at 400 mm distance 3 Crack observed at 400 mm distance and connected into a line 4 Crack observed at 400 mm distance and connected into a line with more than two lines 5 Bursting crack observed at 400 mm distance 6 Ink layer separation observed at 400 mm distance 7

[0195] 2. Wear resistance test (scratch test)

[0196] The scratch test was used to test the abrasion resistance of packaging paper.

[0197] Secure the packaging paper on a test bench, ensuring the surface is flat and dust-free. Use a scratch tester to scratch the surface of the packaging paper at a constant pressure and speed. Repeat this test multiple times, using an initial load of 100g and a scratch speed of 3mm / s (typically). Increase the load by 100g each time until a noticeable scratch appears on the surface of the packaging paper.

[0198] Measure the scratch depth and record the location and depth of the scratch.

[0199] The scratch depth is divided into 5 levels according to the following table. The smaller the scratch depth level, the less severe the damage.

[0200]

[0201]

[0202] Table 1 Test results of folding resistance and explosion-proof performance

[0203] It can be seen from Experimental Example 1, Comparative Examples 1, 3, and 5 in Table 1 that providing an anti-explosion layer, a first protective layer, and a second protective layer on a paper base layer 1 of the same grammage can effectively avoid cracking caused by a single fold and reduce the bursting level of multiple folding tests.

[0204] As shown in Experimental Examples 1 to 4 in Table 1, providing an anti-explosion layer, a first protective layer, and a second protective layer on a high-weight paper base layer 1 can effectively prevent cracking caused by a single fold. Even when the paper base layer 1 weighs 750g, the anti-explosion layer, the first protective layer, and the second protective layer can still effectively reduce the degree of cracking.

[0205] From the experimental examples 1, 5, 6 and comparative examples 1 and 2 in Table 1, it can be seen that the first protective layer, the second protective layer and the coating amount greater than or equal to 4g / m2 are provided on the paper base 1 with the same grammage. 2 The anti-explosion layer can effectively prevent cracking caused by a single fold. As the amount of anti-explosion layer applied increases, the burst level of multiple folding tests gradually decreases.

[0206] From the experimental examples 1, 7, 8 and comparative examples 3 and 4 in Table 1, it can be seen that the anti-explosion layer, the second protective layer and the coating amount greater than or equal to 2g / m2 are set on the paper base 1 with the same grammage. 2 The first protective layer can effectively prevent cracking caused by a single fold. As the amount of the first protective layer increases, the cracking level of multiple folding tests gradually decreases.

[0207] From the experimental examples 1, 9, 10 and comparative examples 5 and 6 in Table 1, it can be seen that the anti-explosion layer, the first protective layer and the coating amount greater than or equal to 2g / m are set on the paper base 1 with the same grammage. 2 The second protective layer can effectively prevent cracking caused by a single fold. As the amount of the second protective layer increases, the cracking level of multiple folding tests gradually decreases.

[0208]

[0209]

[0210] Table 2 Scratch depth level test results

[0211] It can be seen from Experimental Example 1 and Comparative Examples 1, 3 and 5 in Table 2 that providing an anti-explosion layer, a first protective layer and a second protective layer on a paper base layer 1 of the same grammage can reduce the scratch depth level.

[0212] It can be seen from Experimental Examples 1 to 4 in Table 3 that providing an anti-explosion layer, a first protective layer and a second protective layer on the high-weight paper base layer 1 can effectively reduce the scratch depth level.

[0213] From the experimental examples 1, 5, 6 and comparative examples 1 and 2 in Table 4, it can be seen that the first protective layer, the second protective layer and the coating amount greater than or equal to 4g / m2 are provided on the paper base 1 with the same grammage. 2 The anti-explosion layer can reduce the scratch depth level. As the amount of anti-explosion layer applied increases, the scratch depth level decreases.

[0214] From the experimental examples 1, 7, 8 and comparative examples 3 and 4 in Table 2, it can be seen that the anti-explosion layer, the second protective layer and the coating amount greater than or equal to 2g / m2 are set on the paper base 1 with the same grammage. 2 The first protective layer can reduce the scratch depth level. As the coating amount of the first protective layer increases, the scratch depth level decreases.

[0215] From the experimental examples 1, 9, 10 and comparative examples 5 and 6 in Table 2, it can be seen that the anti-explosion layer, the first protective layer and the coating amount greater than or equal to 2g / m are set on the paper base 1 with the same grammage. 2 The second protective layer can reduce the scratch depth level. As the coating amount of the second protective layer increases, the scratch depth level decreases.

[0216] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions within the scope of the claims.

Claims

1. A packaging paper, characterized in that: include: Paper base; a first adhesive layer, disposed on one side of the paper base layer; a first graphic information layer, disposed on a side of the first adhesive layer facing away from the paper base layer, the first graphic information layer having a patterned concave-convex structure; an explosion-proof layer, disposed on a side of the first graphic information layer facing away from the paper base layer, wherein the explosion-proof layer is made of polyurethane resin; A second graphic information layer is provided on a side of the explosion-proof layer away from the paper base layer; The light-transmitting protective layer is arranged on a side of the second graphic information layer facing away from the paper base layer.

2. The packaging paper according to claim 1, characterized in that The light-transmitting protective layer comprises: a second protective sublayer, disposed on a side of the second graphic information layer facing away from the paper base layer; The first protective sublayer is arranged between the anti-explosion layer and the second protective sublayer. The first protective sublayer has a concave-convex texture. The material of the first protective sublayer is different from that of the second protective sublayer.

3. The packaging paper according to claim 2, characterized in that The orthographic projection of the first protective sublayer on the paper base layer at least partially overlaps with the orthographic projection of the first graphic information layer on the paper base layer.

4. The packaging paper according to claim 2, characterized in that The material of the first protective sublayer includes a copolymer of acrylic resin and acrylic monomer.

5. The packaging paper according to claim 2, characterized in that The material of the second protective sublayer includes a copolymer of polyurethane acrylic resin, ethoxylated trimethylolpropane triacrylate, and propoxylated neopentyl glycol diacrylate.

6. The packaging paper according to claim 1, characterized in that The first graphic information layer includes: a reflective layer, disposed on a side of the first adhesive layer facing away from the paper base layer; The concave-convex structure layer has patterned concave and convex parts. The concave-convex structure layer is located on the side of the reflective layer away from the paper base layer. At least part of the reflective layer is located in the concave part, and at least part of the reflective layer is located on the side of the convex part close to the paper base layer.

7. The packaging paper according to claim 1, characterized in that The paper base layer comprises: First paper base; a second adhesive layer, disposed on one side of the first paper base layer; The second paper base layer is arranged between the second adhesive layer and the first adhesive layer.

8. The packaging paper according to claim 7, characterized in that The first paper base layer has a grammage of 300g to 400g. And / or, the second paper base layer has a grammage of 250g to 350g; And / or, the gram weight of the paper base layer is greater than 650 g, and the thickness of the paper base layer is 0.8 to 1.0 mm.

9. The packaging paper according to claim 1, characterized in that The packaging paper also includes: The third graphic information layer is arranged on the side of the paper base layer away from the first adhesive layer.

10. A method for preparing packaging paper, characterized in that: include: Taking a release film, and disposing a first graphic information layer on the release film, wherein the first graphic information layer has a patterned concave-convex structure; Disposing a first adhesive layer on the first graphic information layer and / or the second paper base layer, and bonding the surface of the first graphic information layer facing away from the release film and the second paper base layer via the first adhesive layer; Removing the release film attached to the first graphic information layer, and coating a polyurethane modified emulsion on the surface of the first graphic information layer facing away from the second paper base layer, wherein the polyurethane modified emulsion is cured to form an anti-explosion layer; Taking a first paper base layer, providing a second adhesive layer on the surface of the first paper base layer and / or the second paper base layer facing away from the explosion-proof layer, and bonding the surfaces of the first paper base layer and the second paper base layer facing away from the explosion-proof layer via the second adhesive layer; A second image and text information layer and a light-transmitting protective material layer are sequentially arranged on a surface of the explosion-proof layer away from the first image and text information layer, and the light-transmitting protective material layer is cured to form a light-transmitting protective layer.

11. The method for preparing packaging paper according to claim 10, characterized in that: The release film is removed, and a first graphic information layer is provided on the release film, comprising: Taking a release film, and disposing a photoresist layer on the release film; Performing a film pressing process on the photoresist material layer to obtain a concave-convex structure layer, wherein the concave-convex structure layer has patterned concave portions and convex portions; A reflective material is evaporated on the concave-convex structure layer to form a reflective layer. At least a portion of the reflective layer is located in the concave portion, and at least a portion of the reflective layer is located on a side of the convex portion away from the release film.

12. The method for preparing packaging paper according to claim 11, characterized in that: The second image and text information layer and the light-transmitting protective material layer are sequentially provided on the surface of the explosion-proof layer away from the first image and text information layer, and the light-transmitting protective material layer is cured to form the light-transmitting protective layer, comprising: An explosion-proof base oil and an explosion-proof surface oil are sequentially provided on the surface of the explosion-proof layer away from the first graphic information layer. The explosion-proof base oil is cured to form a first protective sublayer having a concave-convex texture. The explosion-proof surface oil forms a second protective sublayer.

13. The method for preparing packaging paper according to claim 12, characterized in that: The coverage of the polyurethane modified emulsion is 4 to 8 g / m 2 , And / or, the coverage of the explosion-proof primer is 3 to 6 g / m 2 ; And / or, the coverage of the explosion-proof surface oil is 3 to 5 g / m 2 .

14. The method for preparing packaging paper according to claim 12, wherein: Calculated by weight percentage, the explosion-proof primer includes 10-40% acrylic resin and 10-40% acrylic monomer; And / or, by weight percentage, the explosion-proof surface oil includes 30-50% of polyurethane acrylic resin, 2-7% of 4-(2-acetoxyethoxy) benzophenone, 15-30% of ethoxylated trimethylolpropane triacrylate, 15-30% of propoxylated neopentyl glycol diacrylate, and 0.2-1% of an additive.

15. The method for preparing packaging paper according to claim 13, wherein: Measured by weight percentage, the polyurethane modified emulsion includes acrylic resin and water.

16. A paper product, characterized in that The packaging paper comprises the packaging paper according to any one of claims 1 to 9, or the packaging paper prepared by the method for preparing the packaging paper according to any one of claims 10 to 15.

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