A multilayer composite low-transmission panel and a method for manufacturing the same

Abstract

The present application relates to a kind of multilayer composite low light transmission plate and its manufacturing method in the field of low light transmission plate, the low light transmission plate includes skin feeling low transparent UV layer, transparent PMMA plate layer, adhesive layer, printing layer and PVC low transparent film layer, skin feeling low transparent UV layer is coated on transparent PMMA plate layer by excimer process, printing layer is coated on PVC low transparent film layer by printing, transparent PMMA plate layer coated with skin feeling low transparent UV layer and printing layer coated on PVC low transparent film layer are bonded by adhesive layer, the present application can effectively reduce the glare problem caused by direct light through skin feeling low transparent UV layer, maintain certain light transmittance and use comfort, PVC low transparent film layer as the outermost layer, protect the transparent PMMA plate layer and printing layer inside from the erosion of external environment, also further enhance the overall visual effect of low light transmission plate through its unique light transmission effect, and PVC low transparent film layer enhances the overall high-temperature resistance and flame retardant effect, improve the reliability and durability of product.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of low light transmission panels, in particular to a multi-layer composite low light transmission panel and a manufacturing method thereof. BACKGROUND

[0002] As a special functional material, composite low light transmission panels are widely used in scenarios that require soft diffusion and partial shielding of light. They have a wide range of applications, including but not limited to low light transmission panels and translucent panels for light boxes. In the field of advertising light boxes, low light transmission panels not only effectively control the amount of light transmitted, making the light inside the light box more uniform and soft, but also protect the light source inside the light box from external environmental influences, extending its service life. In addition, in the fields of architectural decoration, home decoration, artistic installations, and stage backgrounds, composite low light transmission panels are also favored for their unique visual effects and light control capabilities.

[0003] Existing composite low light transmission panels are typically composed of multiple layers of materials. Their basic structure usually includes a light transmission base layer, a light transmission adjustment layer, a protective layer, and possibly additional functional layers. The light transmission base layer, as the main body of the composite panel, generally uses a material with certain light transmission properties. The light transmission adjustment layer adjusts the light transmission rate by adding pigments, particles, or special structures to achieve low light transmission. The protective layer is applied on top of the light transmission adjustment layer to prevent surface scratches, contamination, and UV damage. In addition, to enhance the performance of the composite panel, additional functional layers such as thermal insulation layers, sound insulation layers, or reinforcement layers may be added.

[0004] However, despite the fact that existing composite low light transmission panels meet market demands to some extent, there are still several shortcomings. First, the uneven distribution of the light transmission layer in existing low light transmission panels, or the material expansion and contraction caused by the use environment, causes fluctuations in the light transmission performance of the composite panel, making it difficult to ensure long-term stable light transmission effects. Second, the existing low light transmission panels have poor flame retardant and high temperature resistance, which affects the use environment and the use of outdoor environments. Third, the existing low light transmission panels have poor UV resistance, which makes them unsuitable for outdoor use.

[0005] The existing manufacturing process of multi-layer low light transmission panels has poor adhesion and manufacturing effects for multi-layer low light transmission panels, affecting the adhesion, strength, and other properties of the panel. In addition, the existing manufacturing process of multi-layer low light transmission panels has poor manufacturing effects, affecting the quality and effectiveness. SUMMARY

[0006] The present application aims to solve the above defects, provide a multi-layer composite low light transmission plate and a manufacturing method thereof, to solve the technical problems that the structure of the composite low light transmission plate in the background art is difficult to meet the use requirements, resulting in poor light transmission, fire resistance, high temperature resistance and ultraviolet resistance, and the manufacturing effect of the existing multi-layer low light transmission plate is poor, thereby affecting the quality and production efficiency of the low light transmission plate.

[0007] The purpose of the present application is achieved by the following way:

[0008] A multi-layer composite low light transmission plate, comprising a skin-feeling low transparent UV layer, a transparent PMMA plate layer, an adhesive layer, a printing layer and a PVC low transparent film layer, the skin-feeling low transparent UV layer is coated on the transparent PMMA plate layer by means of excimer process, the printing layer is coated on the PVC low transparent film layer by printing, and the transparent PMMA plate layer coated with the skin-feeling low transparent UV layer and the printing layer coated on the PVC low transparent film layer are bonded through the adhesive layer, so that the adhesive layer is bonded with the skin-feeling low transparent UV layer and the printing layer.

[0009] Further in the above description, the PVC low transparent film layer comprises PVC resin powder, flame-retardant plasticizer and inorganic flame retardant.

[0010] Further in the above description, the flame-retardant plasticizer is trichloroethyl phosphate, and the content of the flame-retardant plasticizer is 20-28 PA, and the inorganic flame retardant is selected from one or more of antimony trioxide, zinc borate, zinc oxide, magnesium hydroxide or aluminum hydroxide.

[0011] Further in the above description, the skin-feeling low transparent UV layer comprises UV curing type paint, nano toughening agent and reflective layer formed inside the UV curing type paint, the reflective layer is selected from zinc oxide or titanium dioxide, and is deposited in the UV curing type paint, the nano toughening agent is selected from one of nano silicate or nano silicon dioxide or nano carbon tube, and is compounded to form the skin-feeling low transparent UV layer, and the skin-feeling low transparent UV layer is coated and cured on the transparent PMMA plate layer under the irradiation of ultraviolet light by means of excimer process.

[0012] Further in the above description, the skin-feeling low transparent UV layer further comprises anti-ultraviolet scattering agent, the anti-ultraviolet scattering agent comprises nano titanium dioxide or zinc oxide or silicon dioxide, and the anti-ultraviolet scattering agent is attached to the surface of the skin-feeling low transparent UV layer by micro-nano processing to form a rough anti-ultraviolet scattering film layer.

[0013] Further in the above description, the adhesive layer is formed by mixing two adhesive components to form a two-component polyurethane adhesive layer, the two-component polyurethane adhesive layer is composed of isocyanate component and hydroxyl component of NCO, so that the transparent PMMA plate layer and the printing layer are bonded through the adhesive layer.

[0014] A manufacturing method of a multi-layer composite low-transmittance plate, comprising the following steps:

[0015] Step one: material preparation, according to a multi-layer composite low-transmittance plate;

[0016] Step two: melting, feeding the raw material of the transparent PMMA plate layer into a melting machine for hot melting at a temperature of 250-270℃, and feeding the raw material of the PVC low-transmittance film layer into a melting machine for hot melting at a temperature of 250-270℃;

[0017] Step three: extrusion, feeding the melted raw material of the transparent PMMA plate layer and the melted raw material of the PVC low-transmittance film layer into a first extruder and a second extruder respectively for extrusion to form the transparent PMMA plate layer and the PVC low-transmittance film layer;

[0018] Step four: first coating, coating the raw material of the skin-feeling low-transmittance UV layer on the transparent PMMA plate layer by a quasi-molecular spraying process so that the raw material of the skin-feeling low-transmittance UV layer is solidified and cured under the irradiation of ultraviolet light, thereby forming the skin-feeling low-transmittance UV layer on the transparent PMMA plate layer, and the transmittance of the transparent PMMA plate layer with the skin-feeling low-transmittance UV layer after coating is 20-30%;

[0019] Step five: first drying, feeding the transparent PMMA plate layer with the skin-feeling low-transmittance UV layer after the first coating in step four into a drying oven at a temperature of 75-85℃ to start the first drying, so as to further solidify and adhere the skin-feeling low-transmittance UV layer to the transparent PMMA plate layer;

[0020] Step six: second coating, coating the printed pattern on the PVC low-transmittance film layer by printing, so as to form a printed layer on the PVC low-transmittance film layer, and the transmittance of the PVC low-transmittance film layer with the printed layer after coating is 20-35%;

[0021] Step seven: second drying, feeding the PVC low-transmittance film layer with the printed layer after the second coating in step six into a drying oven at a temperature of 75-85℃ to start the second drying, so as to further solidify and adhere the printed layer to the PVC low-transmittance film layer;

[0022] Step eight: bonding, bonding the transparent PMMA plate layer with the skin-feeling low-transmittance UV layer and the printed layer coated on the PVC low-transmittance film layer by an adhesive layer, thereby obtaining a multi-layer composite low-transmittance plate, the thickness of the adhesive layer is 0.01-0.03mm, the thickness of the finished product is 0.9-3.5mm, and the transmittance of the final product is 10-20%.

[0023] Further in the above description, in step three, the thickness of the transparent PMMA plate layer is 0.8-3.0mm, and the thickness of the PVC low-transmittance film layer is 0.04-0.35mm.

[0024] Further in the above description, in step four, after the raw material of the skin-feeling low-transparent UV layer is coated on the transparent PMMA plate layer to form the skin-feeling low-transparent UV layer, the anti-ultraviolet scattering agent is attached to the skin-feeling low-transparent UV layer by spraying to form the anti-ultraviolet scattering film layer.

[0025] Further in the above description, in step eight, the bonded multilayer composite low-transmittance plate is conveyed to the roller gap of the roller pressing mechanism by the conveying belt for roller pressing.

[0026] Advantages of the present application:

[0027] 1. The skin-feeling low-transparent UV layer is coated on the transparent PMMA plate layer by the excimer process, which gives the plate a unique skin feeling, improves the touch experience of the product, makes the touch more delicate, and also realizes the low-transmittance effect. The skin-feeling low-transparent UV layer can effectively reduce the glare caused by direct light, maintain a certain light transmittance and use comfort, and the transparent PMMA plate layer as the core layer of the multilayer composite structure has excellent light transmittance, weather resistance and processing performance, which ensures the overall strength and stability of the plate. The entire low-transmittance plate can maintain high clarity and transparency while ensuring low-transmittance effect. The printing layer is coated on the PVC low-transparent film layer by printing, which can be customized according to customer needs to meet the decoration needs of different occasions. The PVC low-transparent film layer as the outermost layer protects the transparent PMMA plate layer and the printing layer inside from the erosion of the external environment, further enhances the overall visual effect of the low-transmittance plate through the light transmittance effect, and enhances the overall high-temperature resistance and flame retardation effect of the PVC low-transparent film layer.

[0028] 2. The manufacturing method ensures the sufficient curing of the multilayer structure, avoids damage to the substrate and coating layer caused by high temperature, maintains the stability and durability of the product, and uses the excimer spraying process to coat the skin-feeling low-transparent UV layer on the transparent PMMA plate layer. The instant curing under ultraviolet light ensures the uniformity and adhesion of the coating. The transparent PMMA plate layer coated with the skin-feeling low-transparent UV layer is bonded with the printing layer coated on the PVC low-transparent film layer by the adhesive layer, which ensures the close combination between the layers, improves the production efficiency and overall performance of the product, effectively prevents the occurrence of layer peeling or falling off, enhances the overall structural strength of the multilayer composite low-transmittance plate, prolongs the service life of the product, and improves the reliability and durability of the product. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a schematic diagram of the planar structure of the present embodiment;

[0030] Figure 2 It is a schematic diagram of the manufacturing process of the present embodiment;

[0031] The figure marks are respectively: 1-skin feel low transparent UV layer, 2-transparent PMMA plate layer, 3-adhesive layer, 4-printing layer, 5-PVC low transparent film layer. DETAILED DESCRIPTION

[0032] The application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Example one

[0034] In this embodiment, referring to Figure 1 and Figure 2 A multi-layer composite low light transmittance plate is specifically implemented, which comprises a skin feel low transparent UV layer 1, a transparent PMMA plate layer 2, an adhesive layer 3, a printing layer 4 and a PVC low transparent film layer 5. The skin feel low transparent UV layer 1 is coated on the transparent PMMA plate layer 2 by means of an excimer process. The printing layer 4 is coated on the PVC low transparent film layer 5 by printing. The transparent PMMA plate layer 2 coated with the skin feel low transparent UV layer 1 and the PVC low transparent film layer 5 coated with the printing layer 4 are bonded by the adhesive layer 3, so that the adhesive layer 3 is bonded with the skin feel low transparent UV layer 1 and the printing layer 4.

[0035] The PVC low transparent film layer 5 comprises PVC resin powder, flame-retardant plasticizer and inorganic flame-retardant agent. The flame-retardant plasticizer is trichloroethyl phosphate, and the content of the flame-retardant plasticizer is 25 PA. The inorganic flame-retardant agent is selected from zinc oxide. The flame-retardant and high-temperature resistant effects of the PVC low transparent film layer 5 are further enhanced by adding the flame-retardant plasticizer and the inorganic flame-retardant agent, so as to improve the reliability and stability of use.

[0036] The skin feel low transparent UV layer 1 comprises UV curing type paint, nano toughening agent and reflective layer formed in the UV curing type paint. The reflective layer is selected from zinc oxide or titanium dioxide, and is deposited in the UV curing type paint. The nano toughening agent is selected from nano silicon dioxide, and is compounded to form the skin feel low transparent UV layer 1. The skin feel low transparent UV layer 1 is coated and cured on the transparent PMMA plate layer 2 under the irradiation of ultraviolet light by means of an excimer process. The scratch and tensile resistance effects of the skin feel low transparent UV layer 1 are further enhanced by adding the nano toughening agent, the skin feel effect of the product is improved, the comfort of use is improved, and the reflective and ultraviolet resistance effects of the skin feel low transparent UV layer 1 are improved by the formed reflective layer.

[0037] The skin feel low transparent UV layer 1 further comprises anti-ultraviolet scattering agent. The anti-ultraviolet scattering agent comprises silicon dioxide, and is attached to the surface of the skin feel low transparent UV layer 1 by micro-nano processing to form a rough anti-ultraviolet scattering film layer. The set anti-ultraviolet scattering agent can form a scattering layer on the surface of the material, so that the ultraviolet light is scattered to reduce its energy density, and the anti-ultraviolet effect is further improved.

[0038] The adhesive layer 3 is formed by mixing two adhesive components to form a two-component polyurethane adhesive layer 3, which is composed of an isocyanate component of NCO and a hydroxyl component, so that the transparent PMMA plate layer 2 and the printing layer 4 are bonded by the adhesive layer 3. The adhesive layer 3 is formed by chemical reaction of the two adhesive components to form a high-strength bond, which can bond with high strength and durability.

[0039] Specifically, in the present embodiment, the skin-feeling low-transparency UV layer 1 is coated on the transparent PMMA plate layer 2 by excimer process, so as to give the plate a unique skin feeling. The skin-feeling low-transparency UV layer 1 can effectively reduce the glare problem caused by direct light, maintain a certain light transmittance and comfort, the transparent PMMA plate layer 2 as the core layer of the multi-layer composite structure ensures the overall strength and stability of the plate, the printing layer 4 is printed on the PVC low-transparency film layer 5, and the printing layer 4 can be customized according to customer requirements to meet the decoration needs of different occasions, the PVC low-transparency film layer 5 as the outermost layer protects the transparent PMMA plate layer 2 and the printing layer 4 inside from the erosion of the external environment, further enhances the overall visual effect of the low-transparency plate, and the PVC low-transparency film layer 5 enhances the overall high-temperature resistance and flame retardation effect.

[0040] A manufacturing method of a multi-layer composite low-transparency plate, the manufacturing method comprising the following steps:

[0041] Step one: material preparation, according to a multi-layer composite low-transparency plate;

[0042] Step two: melting, the raw materials of the transparent PMMA plate layer are sent into a melting machine for hot melting at a temperature of 250°C, and the raw materials of the PVC low-transparency film layer are sent into a melting machine for hot melting at a temperature of 250°C;

[0043] Step three: extrusion, the melted raw materials of the transparent PMMA plate layer and the melted raw materials of the PVC low-transparency film layer are respectively introduced into a first extruder and a second extruder for extrusion to form the transparent PMMA plate layer and the PVC low-transparency film layer, the extrusion thickness of the transparent PMMA plate layer is 1.0 mm, and the extrusion thickness of the PVC low-transparency film layer is 0.2 mm;

[0044] Step four: first coating, the raw materials of the skin-feeling low-transparency UV layer are coated and solidified on the transparent PMMA plate layer under the irradiation of ultraviolet light by excimer spraying process, so as to form the skin-feeling low-transparency UV layer on the transparent PMMA plate layer, and after the raw materials of the skin-feeling low-transparency UV layer are coated on the transparent PMMA plate layer to form the skin-feeling low-transparency UV layer, an anti-ultraviolet scattering film layer is formed by spraying the anti-ultraviolet scattering agent on the skin-feeling low-transparency UV layer, so that the light transmittance of the transparent PMMA plate layer with the skin-feeling low-transparency UV layer after coating is 23%.

[0045] Step five: first drying, the transparent PMMA plate layer with the skin feel low transparent UV layer after the first coating in step four enters the oven at 75℃ with the conveying belt to start the first drying, further to make the skin feel low transparent UV layer solidify and adhere to the transparent PMMA plate layer;

[0046] Step six: second coating, the printed pattern is coated on the PVC low transparent film layer by printing, so that it forms a printing layer on the PVC low transparent film layer, and the transmittance of the PVC low transparent film layer with the printing layer after coating is 25%;

[0047] Step seven: second drying, the PVC low transparent film layer with the printing layer after the second coating in step six enters the oven at 75℃ with the conveying belt to carry out the second drying, further to make the printing layer solidify and adhere to the PVC low transparent film layer;

[0048] Step eight: bonding, the transparent PMMA plate layer coated with the skin feel low transparent UV layer and the printing layer coated on the PVC low transparent film layer are bonded by the adhesive layer, to obtain a multilayer composite low light transmittance plate, and the bonded multilayer composite low light transmittance plate is conveyed to the roller pressing gap of the roller pressing mechanism for roller pressing, and the thickness of the adhesive layer is 0.01mm.

[0049] In summary, the multilayer composite low light transmittance plate product obtained after the above manufacturing steps is 1mm, and the light transmittance is 13%.

[0050] Example two

[0051] In this embodiment, a manufacturing method of a multilayer composite low light transmittance plate, the manufacturing method comprises the following steps:

[0052] Step one: material preparation, material preparation is carried out according to a multilayer composite low light transmittance plate;

[0053] Step two: melting, the raw material of the transparent PMMA plate layer is sent into a melting machine for hot melting, and the hot melting temperature is 260℃, and the raw material of the PVC low transparent film layer is sent into a melting machine for hot melting, and the hot melting temperature is 260℃;

[0054] Step three: extrusion, the melted raw material of the transparent PMMA plate layer and the melted raw material of the PVC low transparent film layer are respectively introduced into a first extruder and a second extruder for extrusion to form the transparent PMMA plate layer and the PVC low transparent film layer, the extrusion thickness of the transparent PMMA plate layer is 2.0mm, and the thickness of the PVC low transparent film layer is 0.25mm;

[0055] Step four: first coating, the skin low transparent UV layer of raw materials is coated and cured on the transparent PMMA plate layer under the irradiation of ultraviolet light by means of the excimer spraying process, so as to form a skin low transparent UV layer on the transparent PMMA plate layer, and after the skin low transparent UV layer of raw materials is coated on the transparent PMMA plate layer to form the skin low transparent UV layer, the anti-ultraviolet scattering agent is attached to the skin low transparent UV layer to form an anti-ultraviolet scattering film layer by spraying, so that the light transmittance of the transparent PMMA plate layer with the skin low transparent UV layer after coating is 26%;

[0056] Step five: first drying, the transparent PMMA plate layer with the skin low transparent UV layer after the first coating in step four enters an oven at 80 DEG C with the conveying belt to start the first drying, so as to further cure the skin low transparent UV layer and attach it to the transparent PMMA plate layer;

[0057] Step six: second coating, the printed pattern is coated on the PVC low transparent film layer by printing to form a printed layer on the PVC low transparent film layer, so that the light transmittance of the PVC low transparent film layer with the printed layer after coating is 28%;

[0058] Step seven: second drying, the PVC low transparent film layer with the printed layer after the second coating in step six enters an oven at 80 DEG C with the conveying belt to start the second drying, so as to further cure the printed layer and attach it to the PVC low transparent film layer;

[0059] Step eight: bonding, the transparent PMMA plate layer with the skin low transparent UV layer and the printed layer coated on the PVC low transparent film layer are bonded by means of the adhesive layer to obtain a multilayer composite low light transmittance plate, and the bonded multilayer composite low light transmittance plate is conveyed to the roller pressing gap of the roller pressing mechanism by the conveying belt for roller pressing, and the thickness of the adhesive layer is 0.02 mm.

[0060] In summary, the multilayer composite low light transmittance plate product obtained through the above manufacturing steps is 1.5 mm, and the light transmittance is 18%.

[0061] The above description is only the preferred embodiment of the present application, and does not limit the present application in any form. Although the present application is disclosed as above with the preferred embodiment, it is not intended to limit the present application. Any skilled person in the art can make some changes or modifications to the above disclosed technical content without departing from the scope of the technical solution of the present application, and any simple modification, equivalent change and modification of the above embodiment within the scope of the technical solution of the present application are all within the scope of the technical solution of the present application.

Claims

1. A multi-layer composite low-transmittance plate, characterized in that: The product comprises a skin-feel low-transparency UV layer, a transparent PMMA sheet layer, an adhesive layer, a printing layer, and a PVC low-transparency film layer. The skin-feel low-transparency UV layer is coated onto the transparent PMMA sheet layer using an excimer laser process, resulting in a light transmittance of 20-30% for the PMMA sheet layer after coating. The printing layer is applied onto the PVC low-transparency film layer, resulting in a light transmittance of 20-35% for the PVC low-transparency film layer after coating. The adhesive layer bonds the transparent PMMA sheet layer coated with the skin-feel low-transparency UV layer to the printed layer coated on the PVC low-transparency film layer, thus bonding the adhesive layer to both the skin-feel low-transparency UV layer and the printed layer. The final product has a light transmittance of 10-20%. The low-transparency PVC film layer includes PVC resin powder, flame retardant plasticizer, and inorganic flame retardant; The skin-feel low-transparency UV layer includes a UV-curable coating, a nano-toughening agent, and a reflective layer formed inside the UV-curable coating. The reflective layer is selected from zinc oxide or titanium dioxide and is deposited into the UV-curable coating. The nano-toughening agent is selected from one of nano-silicate, nano-silica, or nano-carbon nanotubes and is composited to form the skin-feel low-transparency UV layer. The skin-feel low-transparency UV layer is coated and cured on a transparent PMMA board under ultraviolet light using an excimer laser process. The skin-feel low-transparency UV layer also includes anti-UV scattering agents, including nano-titanium dioxide, zinc oxide, or silicon dioxide. Anti-UV heat dissipation agents are attached to the surface of the skin-feel low-transparency UV layer through micro-nano processing to form a rough anti-UV scattering film layer. The adhesive layer is a two-component polyurethane adhesive layer formed by mixing two adhesive components. The two-component polyurethane adhesive layer consists of the isocyanate component and the hydroxyl component of NCO, which allows it to bond the transparent PMMA sheet layer to the printed layer through the adhesive layer.

2. The multilayer composite low-transmittance plate according to claim 1, characterized in that: The flame retardant plasticizer is set as trichloroethyl phosphate, and the content of the flame retardant plasticizer is 20-28 PA. The inorganic flame retardant is selected from one or more of antimony trioxide, zinc borate, zinc oxide, magnesium hydroxide or aluminum hydroxide.

3. A method for manufacturing a multilayer composite low-transmittance plate, characterized in that: The manufacturing method includes the following steps: Step 1: Material preparation, according to any one of claims 1-2, prepare the multi-layer composite low-transmittance plate; Step 2: Melting. The raw material of the transparent PMMA sheet layer is fed into the melting machine for hot melting at a temperature of 250-270°C. The raw material of the low transparency PVC film layer is also fed into the melting machine for hot melting at a temperature of 250-270°C. Step 3: Extrusion. The molten raw materials for the transparent PMMA sheet layer and the molten raw materials for the low-transparency PVC film layer are respectively fed into the first extruder and the second extruder for extrusion to form the transparent PMMA sheet layer and the low-transparency PVC film layer. Step 4: First coating: The raw material of the skin-feel low transparency UV layer is coated and cured on the transparent PMMA board under ultraviolet light through an excimer spraying process, thereby forming a skin-feel low transparency UV layer on the transparent PMMA board. Step 5: First drying. After the first coating in Step 4, the transparent PMMA board with the skin-feel low-transparency UV layer enters the oven at 75-85°C via conveyor belt to begin the first drying, which further cures and adheres the skin-feel low-transparency UV layer to the transparent PMMA board. Step Six: Second coating, the printed pattern is applied to the PVC low transparency film layer by printing, so that it forms a printed layer on the PVC low transparency film layer; Step 7: Second drying. After the second coating in step 6, the PVC low transparency film layer with the printed layer enters the oven at 75-85°C for a second drying along the conveyor belt, so that the printed layer can be cured and adhered to the PVC low transparency film layer. Step 8: Bonding. The transparent PMMA board with a skin-feel low-transparency UV coating is bonded to the printed layer coated on the PVC low-transparency film using an adhesive layer to obtain a multi-layer composite low-transparency board.

4. The method for manufacturing a multilayer composite low-transmittance plate according to claim 3, characterized in that: In step three, the thickness of the transparent PMMA sheet extrusion layer is 0.8-3.0 mm, and the thickness of the PVC low-transparency film layer is 0.04-0.35 mm.

5. The method for manufacturing a multilayer composite low-transmittance plate according to claim 3, characterized in that: In step four, after coating the raw material of the skin-feel low-transparency UV layer onto the transparent PMMA plate to form the skin-feel low-transparency UV layer, the anti-UV scattering agent is attached to the skin-feel low-transparency UV layer by spraying to form an anti-UV scattering film layer.

6. The method for manufacturing a multilayer composite low-transmittance plate according to claim 3, characterized in that: In step eight, the bonded multi-layer composite low-transmittance plate is conveyed to the rolling gap of the rolling mechanism by a conveyor belt for rolling.

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