Optical paper

Abstract

The present invention belongs to the technical field of optical paper, and is particularly an optical paper, comprising a functional coating on the top, a fiber layer in the middle, and a bottom layer at the bottom. The functional coating is a mixture of nano-scale fluorescent whitening agent particles and polyetheresteramide polymer antistatic agents; the fiber layer is a mixture of long fibers and short fibers woven together with a layer of high-strength synthetic fibers in the middle; the bottom layer is a layer of polyethylene foam with silica microspheres added as a basis. The present invention improves whiteness and antistatic properties through the functional coating, making printing more outstanding. The fiber layer is reinforced by different fiber combinations and aramid fibers, and has both strength and smoothness. The adhesive layer ensures structural stability, and the bottom layer is non-slip and cushioning. It performs well in packaging, printing and other fields, and meets diverse needs.

Description

Technical Field

[0001] The present invention relates to the technical field of optical paper, in particular to optical paper. Background Art

[0002] With the continuous advancement of science and technology and the growing demand for high-quality printing and packaging materials, optical paper has emerged as a new type of paper material with special optical properties. Based on traditional paper, optical paper aims to provide better gloss, flatness, antistatic performance, strength and other properties through careful design and improvement of each structural layer to meet the diverse application needs of different fields.

[0003] Traditional paper has shortcomings in many aspects. For example, ordinary paper has a low glossiness and is difficult to present bright and vivid color effects. It often fails to achieve satisfactory visual effects when printing high-quality images and graphic materials. In addition, traditional paper is prone to static electricity, which not only causes the paper to absorb dust during production and use, affecting the cleanliness and appearance quality of the paper, but may also cause damage to some precision printing equipment and electronic equipment. In terms of strength, traditional paper is also difficult to meet the requirements of some special application scenarios, such as heavy product packaging, occasions that require frequent folding or withstand large external forces, etc. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the shortcomings of the prior art, the present invention provides an optical paper to solve the problems raised in the above background technology.

[0006] (II) Technical solution

[0007] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0008] An optical paper comprises a functional coating layer at the top, a fiber layer in the middle and a bottom layer at the bottom, wherein the functional coating layer is formed by mixing nano-scale fluorescent brightener particles and polyether ester amide polymer antistatic agents;

[0009] The fiber layer is a mixture of long fibers and short fibers, with a layer of high-strength synthetic fibers in the middle.

[0010] The bottom layer is composed of a layer of polyethylene foam with silica microspheres added as a base.

[0011] Furthermore, the long fibers are softwood pulp fibers.

[0012] Furthermore, the short fibers are hardwood pulp fibers.

[0013] Furthermore, the high-strength synthetic fiber is composed of aramid fiber.

[0014] Furthermore, the mixing ratio of the long fibers to the short fibers in the fiber layer is 7:3; 8:2; 4:6 or 3:7.

[0015] Furthermore, a bonding layer is added between the fiber layer and the bottom layer, and the bonding layer can be made of environmentally friendly glue or hot-melt adhesive film.

[0016] A method for manufacturing optical paper comprises the following steps:

[0017] S1. Preparation of functional coating:

[0018] Add nano-scale fluorescent brightener particles and polyether ester amide polymer antistatic agent into a proper amount of solvent (such as ethanol or water) according to proportion;

[0019] Use a high-speed stirring device (such as a magnetic stirrer or a mechanical stirrer) to stir at a speed of 1000-2000 rpm for 30-60 minutes to ensure that the particles and the agent are fully dissolved and evenly dispersed to form a functional coating mixture;

[0020] S2. Fiber layer molding:

[0021] Mix coniferous wood pulp fibers (long fibers) and broadleaf wood pulp fibers (short fibers) in a specific ratio (such as 7:3, 8:2, 4:6 or 3:7) and put them into a deflaker, add an appropriate amount of water, and deflake at a speed of 500-1000 rpm for 10-20 minutes to fully disperse the fibers;

[0022] The fiber suspension after debonding is poured into the wire of the paper machine, and a wet paper web is initially formed through the filtering and dehydration of the wire; at the same time, the aramid fiber is evenly laid in the middle layer of the wet paper web;

[0023] The wet paper web enters the press section and is further dehydrated under a pressure of 5-10 MPa to make the fiber layer more tightly bonded;

[0024] S3, bottom layer production:

[0025] Adding silica microspheres to polyethylene emulsion, wherein the amount of silica microspheres added is 5%-15% of the mass of the polyethylene emulsion; using an ultrasonic dispersion device to ultrasonically treat at a frequency of 20-40kHz for 15-30 minutes to uniformly disperse the silica microspheres in the polyethylene emulsion to form a base coating;

[0026] The primer is evenly coated on the bottom of the formed fiber layer through the coating equipment, and the coating amount is 5-15g / m 2; Then the coated paper is passed through a drying device and dried at a temperature of 80-120°C for 5-10 minutes to solidify the bottom coating and form a bottom layer;

[0027] S4. Adhesive layer application and paper lamination:

[0028] If environmentally friendly glue is selected as the bonding layer, dilute the glue to a suitable concentration (such as a solid content of 20%-40%), and then evenly apply the glue to the bottom of the fiber layer through a coating roller. The coating amount is 3-8g / m 2 ; Immediately laminate the fiber layer with glue to the bottom layer, use a pressure roller to roll at a pressure of 0.5-1.5MPa to make the two layers tightly bonded, and place at room temperature for 2-4 hours to allow the glue to fully solidify;

[0029] If hot melt adhesive film is used, heat the hot melt adhesive film to 120-180°C through a heating roller to melt it, and then adhere the melted hot melt adhesive film to the bottom of the fiber layer. Then, the bottom layer and the fiber layer are rolled and laminated under a pressure of 0.3-1.0 MPa. After cooling, the hot melt adhesive film solidifies to complete the paper lamination.

[0030] S5. Post-processing:

[0031] The composite paper is subjected to finishing treatment, such as calendering at a pressure of 10-30 MPa using a super calender to improve the glossiness and smoothness of the paper;

[0032] Cut and package the paper to make the final optical paper product

[0033] (III) Beneficial effects

[0034] Compared with the prior art, the present invention provides an optical paper having the following beneficial effects:

[0035] In the present invention, the fluorescent brightener particles in the functional coating make the paper whiter and brighter, enhance the reflection of light, and improve the visual effect of the printed matter. The antistatic agent reduces the accumulation of static electricity, avoids the absorption of dust and damage to the equipment. For example, when printing high-quality images and graphic materials, the colors are brighter and more vivid.

[0036] In the present invention, the long fibers of the fiber layer provide strength, the short fibers improve the surface, and the aramid fibers are further reinforced. Different proportions are adapted to various needs, and the adhesive layer ensures that the layers are tightly combined. For example, when making packaging cartons, the articles can be better protected and are not easily damaged when used for a long time or subjected to stress.

[0037] The present invention has anti-skid silicon dioxide microspheres on the bottom layer and a buffering effect of external force on the polyethylene foam. During packaging and use, the invention can prevent paper from slipping and protect products from vibration and collision. The invention is suitable for packaging of various products and improves safety and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0039] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention;

[0040] Figure 3 The figure is a flow chart of the method of the present invention.

[0041] In the figure: 1. functional coating; 2. fiber layer; 3. bottom layer. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] Example

[0044] like Figure 1-2 As shown, an optical paper proposed in one embodiment of the present invention comprises a functional coating layer 1 on the top, a fiber layer 2 in the middle and a bottom layer 3 at the bottom, wherein the functional coating layer 1 is formed by mixing nano-scale fluorescent brightener particles and polyether ester amide polymer antistatic agents;

[0045] The fiber layer 2 is composed of a mixed weave of long fibers and short fibers with a layer of high-strength synthetic fibers in the middle;

[0046] The bottom layer 3 is composed of a layer of polyethylene foam with silica microspheres added as a base;

[0047] The functional coating 1 is mixed with nano-scale fluorescent whitening agent particles and polyether ester amide polymer antistatic agent.

[0048] Nano-scale fluorescent brightener particles can improve the whiteness and brightness of paper, making the paper visually whiter and more eye-catching, thereby enhancing the paper's reflection of light, which is conducive to presenting brighter and more vivid colors. It is particularly suitable for high-quality printing, such as magazine covers, product brochures, etc., and can enhance the visual effects of printed materials.

[0049] Polyetheresteramide polymer antistatic agents can effectively reduce static electricity accumulation on the surface of paper. During the production, transportation and use of paper, static electricity can easily absorb dust, affecting the cleanliness and appearance quality of the paper. The addition of antistatic agents can avoid this. At the same time, for some application scenarios involving electronic devices or those sensitive to static electricity, such as paper in electronic device packaging, antistatic properties can prevent static electricity from damaging electronic devices, thereby improving the safety and stability of paper use.

[0050] The fiber layer 2 is woven from a mixture of long fibers and short fibers, and a layer of high-strength synthetic fibers is mixed in the middle. The mixing ratio of long fibers to short fibers can be selected from 7:3, 8:2, 4:6 or 3:7, etc., and can be adjusted according to different needs.

[0051] Long fibers have a longer fiber length, which can provide higher strength and toughness for paper, making the paper less likely to break when subjected to external forces. They are suitable for application scenarios with high strength requirements, such as large poster paper, heavy product packaging paper, etc., to ensure that the paper can remain intact and not easily damaged during use.

[0052] Short fibers help fill the gaps between long fibers, making the surface of the paper smoother. This is very important for printing. A smooth surface allows the ink to adhere better, and the printed patterns and text are clearer and more delicate, thereby improving the printing quality. It is suitable for all kinds of high-quality printed products, such as book pages, art albums, etc.

[0053] The middle aramid fiber layer, as a high-strength synthetic fiber, further significantly enhances the overall strength of the paper. Aramid fiber has ultra-high strength and modulus, which can effectively prevent the paper from breaking or deforming when it is subjected to large external impacts or heavy objects, greatly improving the durability and reliability of the paper. For example, when making packaging cartons that need to be frequently moved or may be subject to collisions, it can better protect the internal items.

[0054] The bottom layer 3 is based on the addition of silica microspheres, and a layer of polyethylene foam is provided.

[0055] The addition of silica microspheres gives the bottom layer a certain degree of roughness, thereby increasing the friction between the paper and the contact surface, playing an anti-skid role. When stacking paper or packaging items, the anti-skid property can prevent the paper from sliding, keep the paper neatly arranged, and reduce the risk of damage caused by sliding. It is particularly suitable for paper products that need to be stably stacked, such as paper stored in warehouses or multi-layer packaging materials.

[0056] The polyethylene foam layer provides good cushioning properties. When optical paper is used to package products, such as electronic products and fragile items, the foam layer can absorb and disperse external impact forces, effectively protecting the products from damage caused by vibration and collision. At the same time, the foam layer can also increase the three-dimensional sense of paper packaging, making the packaging more beautiful and having a certain protective structure, thus improving the overall packaging effect of the product.

[0057] The bonding layer uses environmentally friendly glue or hot-melt adhesive film as bonding material.

[0058] The presence of the adhesive layer strengthens the bonding force between the fiber layer and the bottom layer, ensuring that the layers of paper are tightly connected. During the use of paper, especially when subjected to external forces or environmental changes, the adhesive layer can prevent the bottom layer from separating from the fiber layer, maintain the integrity and stability of the paper, improve the durability of the paper, extend the service life of the paper, and enable the paper to maintain good performance in various application scenarios.

[0059] like Figure 1 As shown, in some embodiments, the long fibers are coniferous pulp fibers; coniferous pulp fibers generally have a longer fiber length, and their length is generally between 2-5 mm. This longer fiber morphology enables it to form a more continuous and strong fiber network in the paper structure. For example, during the paper forming process, the long fibers are intertwined and entangled with each other to form a skeleton-like structure, which provides strong support for the paper, thereby significantly improving the tensile strength of the paper. Compared with short fibers, the long fiber characteristics of coniferous pulp fibers enable them to better withstand tensile and tearing forces, making the paper less likely to break during use;

[0060] The fiber cell wall is thick, which gives softwood pulp fiber high strength and toughness. When optical paper is subjected to external forces, such as folding, squeezing during packaging or friction during handling, the thick-walled fibers can effectively resist deformation and damage. For example, when making large poster paper, the paper needs to remain flat and intact during hanging and display. The high strength characteristics of softwood pulp fiber can ensure that the poster will not be damaged or deformed after long-term use.

[0061] like Figure 1 As shown, in some embodiments, the short fibers are hardwood pulp fibers; hardwood pulp fibers are relatively short, and their length is generally between 0.5-1.5 mm. The shorter fiber length allows it to be arranged more closely in the paper, filling the gaps between long fibers. For example, in the paper forming process, hardwood pulp fibers can make the microstructure of the paper more compact, just like fine sand filling the gaps between stones, thereby improving the smoothness of the paper. Compared with long fibers, hardwood pulp fibers can make the surface of the paper more delicate and reduce the roughness of the surface of the paper, which is crucial for high-quality printing.

[0062] The fiber cell wall is thin and the surface is relatively soft. This characteristic allows the hardwood pulp fiber to form a relatively soft covering layer on the surface of the paper, which is beneficial to improve the flexibility of the paper. During the processing and use of paper, such as folding and curling, the soft fiber layer can reduce the risk of cracks or breaks in the paper, making the paper more operable.

[0063] like Figure 2 As shown, in some embodiments, the high-strength synthetic fiber composition is aramid fiber; aramid fiber has extremely high tensile strength, and its strength is much higher than that of general organic fiber and inorganic fiber. For example, the tensile strength of aramid fiber can reach 3-5GPa, which is several times higher than that of ordinary polyester fiber. This high-strength characteristic allows the paper to withstand greater tension and not easily break after adding aramid fiber to the fiber layer. In the application of optical paper, such as making large outdoor advertising posters or promotional materials that need to be frequently hung and displayed, the paper needs to have sufficient strength to resist external forces such as wind and deadweight. The high strength of aramid fiber can ensure that the paper remains intact under these conditions without tearing or damage.

[0064] At the same time, aramid fiber also has a high modulus, which is generally between 60-120GPa. High modulus means that the fiber deforms very little when subjected to force and has excellent rigidity. When paper is subjected to pressure or bending, aramid fiber can maintain its shape and effectively prevent excessive deformation of the paper. For example, when making packaging boxes for optical instruments, the paper needs to maintain a certain shape and structural stability. The high modulus characteristics of aramid fiber can meet this requirement and protect the internal instruments from damage caused by external force.

[0065] like Figure 2 As shown, in some embodiments, the mixing ratio of long fibers and short fibers in the fiber layer 2 is 7:3; 8:2; 4:6 or 3:7;

[0066] 7:3 ratio

[0067] Strength advantage: When the ratio of long-fiber softwood pulp fiber to short-fiber hardwood pulp fiber is 7:3, the paper has higher strength. The long fibers dominate at this ratio, forming a relatively strong fiber network structure, providing the paper with strong tensile and tear resistance. For example, when making large posters or packaging paper that needs to withstand a certain external force, this ratio of fiber layers can ensure that the paper is not easily damaged when hanging, transporting or slightly bumped, and maintains its intact shape.

[0068] 8:2 ratio

[0069] High-strength applications: The content of long fibers at this ratio is further increased, and the strength of the paper is further improved. It is suitable for special application scenarios with extremely high strength requirements, such as making packaging paper for heavy machinery products, which need to withstand large weight compression and friction; or for making posters that need to be displayed outdoors for a long time and may be affected by severe weather conditions, such as billboards at the seaside or in windy and sandy areas. In these cases, the fiber layer with a ratio of 8:2 can provide excellent anti-destruction performance, ensuring that the paper maintains structural integrity during long-term use.

[0070] 4:6 ratio

[0071] Balanced performance: The ratio of 4:6 achieves a good balance between strength and smoothness. The long fibers provide sufficient strength support, so that the paper has a certain ability to resist external forces and is suitable for common printing and packaging applications. For example, it performs well in making ordinary book covers, brochures, and packaging boxes for general electronic products. The paper can withstand certain external forces during folding, flipping and handling, while ensuring good printing quality.

[0072] 3:7 ratio

[0073] Surface optimization: When the ratio of long fiber to short fiber is 3:7, the surface smoothness of the paper reaches a high level. The presence of a large number of short fibers makes the surface of the paper almost without obvious fiber texture, showing a very delicate texture. This is extremely beneficial for application scenarios that require high-precision printing, such as high-end art albums, limited edition photography printing, high-quality brand promotion posters, etc. It can restore the details of the image and the subtle changes in color to the greatest extent, making the printed products have extremely high artistic value and visual impact.

[0074] like Figure 2 As shown, in some embodiments, a bonding layer is added between the fiber layer 2 and the bottom layer 3, and the bonding layer can be made of environmentally friendly glue or hot melt adhesive film; after curing, the environmentally friendly glue or hot melt adhesive film can fill the tiny uneven places on the surface of the fiber layer 2 and the bottom layer 3, forming a similar "anchoring" effect. The glue or adhesive film molecules penetrate into the fiber gaps of the fiber layer and the pores of the polyethylene foam and silica microspheres of the bottom layer. When cured, tiny bonding "hooks" are formed in these pores, tightly connecting the two layers together. This mechanical bonding method greatly increases the friction and adhesion between the fiber layer and the bottom layer, preventing the two layers from easily separating when subjected to external forces. For example, when the paper is subjected to operations such as bending, folding or stretching, the bonding layer can ensure that the fiber layer and the bottom layer remain intact and no stratification occurs, thereby ensuring the structural integrity and performance of the paper.

[0075] like Figure 3 :A method for manufacturing optical paper, comprising the following steps:

[0076] S1. Preparation of functional coating 1:

[0077] Add nano-scale fluorescent brightener particles and polyether ester amide polymer antistatic agent into a proper amount of solvent (such as ethanol or water) according to proportion;

[0078] Use a high-speed stirring device (such as a magnetic stirrer or a mechanical stirrer) to stir at a speed of 1000-2000 rpm for 30-60 minutes to ensure that the particles and the agent are fully dissolved and evenly dispersed to form a functional coating mixture;

[0079] S2, fiber layer 2 molding:

[0080] Mix coniferous wood pulp fibers (long fibers) and broadleaf wood pulp fibers (short fibers) in a specific ratio (such as 7:3, 8:2, 4:6 or 3:7) and put them into a deflaker, add an appropriate amount of water, and deflake at a speed of 500-1000 rpm for 10-20 minutes to fully disperse the fibers;

[0081] The fiber suspension after debonding is poured into the wire of the paper machine, and a wet paper web is initially formed through the filtering and dehydration of the wire; at the same time, the aramid fiber is evenly laid in the middle layer of the wet paper web;

[0082] The wet paper web enters the press section and is further dehydrated under a pressure of 5-10 MPa to make the fiber layer more tightly bonded;

[0083] S3, bottom 3 production:

[0084] Adding silica microspheres to polyethylene emulsion, wherein the amount of silica microspheres added is 5%-15% of the mass of the polyethylene emulsion; using an ultrasonic dispersion device to ultrasonically treat at a frequency of 20-40kHz for 15-30 minutes to uniformly disperse the silica microspheres in the polyethylene emulsion to form a base coating;

[0085] The primer is evenly coated on the bottom of the formed fiber layer through the coating equipment, and the coating amount is 5-15g / m 2 ; Then the coated paper is passed through a drying device and dried at a temperature of 80-120°C for 5-10 minutes to solidify the bottom coating and form a bottom layer;

[0086] S4. Adhesive layer application and paper lamination:

[0087] If environmentally friendly glue is selected as the bonding layer, dilute the glue to a suitable concentration (such as a solid content of 20%-40%), and then evenly apply the glue to the bottom of the fiber layer through a coating roller. The coating amount is 3-8g / m 2; Immediately laminate the fiber layer with glue to the bottom layer, use a pressure roller to roll at a pressure of 0.5-1.5MPa to make the two layers tightly bonded, and place at room temperature for 2-4 hours to allow the glue to fully solidify;

[0088] If hot melt adhesive film is used, heat the hot melt adhesive film to 120-180°C through a heating roller to melt it, and then adhere the melted hot melt adhesive film to the bottom of the fiber layer. Then, the bottom layer and the fiber layer are rolled and laminated under a pressure of 0.3-1.0 MPa. After cooling, the hot melt adhesive film solidifies to complete the paper lamination.

[0089] S5. Post-processing:

[0090] The composite paper is subjected to finishing treatment, such as calendering at a pressure of 10-30 MPa using a super calender to improve the glossiness and smoothness of the paper;

[0091] The paper is cut and packaged to make the final optical paper product.

[0092] Comparison table with existing papers:

[0093]

[0094] Significantly improved optical performance

[0095] The functional coating of the optical paper of the present invention has a glossiness far exceeding that of existing paper by adding nano-scale fluorescent brightener particles, which can significantly enhance the visual effect of printed products and make the colors more vivid. This feature gives it a clear advantage in high-quality printing applications such as magazine covers, product brochures, and high-end art albums, and can better meet the market demand for exquisite printed products.

[0096] At the same time, the polyetheresteramide polymer antistatic agent in the functional coating effectively solves the problem of static electricity in existing paper. Reducing static electricity accumulation not only prevents the paper from absorbing dust and affecting its appearance, but also improves the safety of use in electronic devices or static-sensitive scenarios, such as electronic equipment packaging paper, providing more reliable protection for the widespread application of paper.

[0097] Excellent strength and durability

[0098] The unique design of the fiber layer is a highlight of the present invention. The reasonable combination of long fibers (coniferous wood pulp fibers) and short fibers (broadleaf wood pulp fibers), combined with the aramid fibers in the middle, builds a strong strength support system. Different mixing ratios can accurately adapt to the strength requirements of various application scenarios, whether it is a large poster, heavy product packaging paper, or a packaging carton that needs to be frequently handled or subjected to collisions, it can ensure that the paper maintains structural integrity under long-term use or stress, and is not easily damaged, greatly improving the durability and reliability of the paper.

[0099] Compared with the strength limitations of existing paper, the optical paper of the present invention can better meet the stringent requirements of modern industry and commerce on the strength of packaging and printing materials, and effectively reduce the risk of product damage caused by insufficient paper strength.

[0100] Excellent surface properties

[0101] Short fibers significantly improve the smoothness of the paper surface. By filling the gaps between long fibers, the paper surface becomes smoother and flatter, greatly improving the ink adhesion and printing clarity. Especially in high-precision printing scenarios, such as limited edition photography printing, high-quality brand promotional posters, etc., it can accurately restore image details and subtle color changes, showing extremely high artistic value and visual impact.

[0102] Compared with existing paper, the surface performance optimization of the optical paper of the present invention enables it to achieve a qualitative leap in printing quality, can meet application requirements with extremely high requirements for printing effects, and improve the overall quality of printed products.

[0103] Good anti-slip and cushioning properties

[0104] The silica microspheres in the bottom layer provide excellent anti-slip properties for the paper, effectively preventing the paper from sliding during stacking or packaging, ensuring the neat arrangement of the paper and reducing the risk of damage caused by sliding. This feature is of great significance in applications such as warehouse storage of paper and multi-layer packaging materials, improving the convenience and safety of paper use.

[0105] The cushioning performance of the polyethylene foam layer is another important advantage of the present invention. When packaging electronic products, fragile items, etc., it can effectively absorb and disperse external impact forces, provide reliable protection for the products, and reduce the damage rate during transportation and handling. At the same time, the foam layer also increases the three-dimensional sense of the packaging, improves the aesthetics and practicality of the product packaging, and enhances the market competitiveness of the product.

[0106] Enhanced structural stability

[0107] The bonding layer between the fiber layer and the bottom layer uses environmentally friendly glue or hot melt adhesive film. This design significantly enhances the bonding force between the layers of paper. When the paper is affected by various external forces or environmental changes, the bonding layer can effectively prevent the bottom layer from separating from the fiber layer, ensuring the integrity and stability of the paper. This allows the optical paper of the present invention to maintain good performance in different usage scenarios, prolongs the service life of the paper, and improves the quality and reliability of the product.

[0108] Compared with the existing situation where the bonding force between paper layers is relatively weak, the structural design of the present invention is more adaptable to complex use environments and processing techniques, and provides a solid foundation for the wide application of paper in the packaging, printing and other industries.

[0109] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An optical paper comprising a functional coating layer (1) at the top, a fiber layer (2) in the middle and a base layer (3) at the bottom, characterized in that: The functional coating (1) is formed by mixing nano-scale fluorescent whitening agent particles and polyether ester amide polymer antistatic agents; The fiber layer (2) is composed of a mixture of long fibers and short fibers, with a layer of high-strength synthetic fibers in the middle; The bottom layer (3) is composed of a layer of polyethylene foam with silica microspheres added as a base.

2. The optical paper according to claim 1, characterized in that: The long fibers are softwood pulp fibers.

3. The optical paper according to claim 1, characterized in that: The staple fibers are hardwood pulp fibers.

4. The optical paper according to claim 1, characterized in that: The high-strength synthetic fiber is composed of aramid fiber.

5. The optical paper according to claim 1, characterized in that: The mixing ratio of long fibers to short fibers in the fiber layer (2) is 7:3; 8:2; 4:6 or 3:

7.

6. The optical paper according to claim 1, characterized in that: A bonding layer is added between the fiber layer (2) and the bottom layer (3), and the bonding layer can be made of environmentally friendly glue or hot-melt adhesive film.

7. The method for manufacturing optical paper according to claim 1, characterized in that: The steps include: S1. Preparation of functional coating (1): Add nano-scale fluorescent whitening agent particles and polyether ester amide polymer antistatic agent into a proper amount of solvent according to proportion; Use high-speed stirring equipment to stir at a speed of 1000-2000 rpm for 30-60 minutes to ensure that the particles and the agent are fully dissolved and evenly dispersed to form a functional coating mixture; S2. Fiber layer (2) forming: Mix coniferous wood pulp fibers and broadleaf wood pulp fibers in a specific ratio (such as 7:3, 8:2, 4:6 or 3:7) and put them into a deflaker, add an appropriate amount of water, and deflake at a speed of 500-1000 rpm for 10-20 minutes to fully disperse the fibers; The fiber suspension after debonding is poured into the wire of the paper machine, and a wet paper web is initially formed through the filtering and dehydration of the wire; at the same time, the aramid fiber is evenly laid in the middle layer of the wet paper web; The wet paper web enters the press section and is further dehydrated under a pressure of 5-10 MPa to make the fiber layer more tightly bonded; S3, bottom layer (3) production: Adding silica microspheres to polyethylene emulsion, wherein the amount of silica microspheres added is 5%-15% of the mass of the polyethylene emulsion; using an ultrasonic dispersion device to ultrasonically treat at a frequency of 20-40kHz for 15-30 minutes to uniformly disperse the silica microspheres in the polyethylene emulsion to form a base coating; The primer is evenly coated on the bottom of the formed fiber layer through the coating equipment, and the coating amount is 5-15g / m 2 ; Then the coated paper is passed through a drying device and dried at a temperature of 80-120°C for 5-10 minutes to solidify the bottom coating and form a bottom layer; S4. Adhesive layer application and paper lamination: If you choose environmentally friendly glue as the bonding layer, dilute the glue to a suitable concentration, and then use a coating roller to evenly apply the glue to the bottom of the fiber layer. The coating amount is 3-8g / m 2 ; Immediately laminate the fiber layer with glue to the bottom layer, use a pressure roller to roll at a pressure of 0.5-1.5MPa to make the two layers tightly bonded, and place at room temperature for 2-4 hours to allow the glue to fully solidify; If hot melt adhesive film is used, heat the hot melt adhesive film to 120-180°C through a heating roller to melt it, and then adhere the melted hot melt adhesive film to the bottom of the fiber layer. Then, the bottom layer and the fiber layer are rolled and laminated under a pressure of 0.3-1.0 MPa. After cooling, the hot melt adhesive film solidifies to complete the paper lamination. S5. Post-processing: The composite paper is subjected to finishing treatment, such as calendering at a pressure of 10-30 MPa using a super calender to improve the glossiness and smoothness of the paper; The paper is cut and packaged to make the final optical paper product.

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