Membrane assembly with moisture-proof function

Abstract

The utility model discloses a film assembly with a moisture-proof function, which relates to the technical field of laminated film assemblies for glass surfaces, and comprises a film layer and a moisture-proof layer, a first bonding layer is arranged above the moisture-proof layer, a second bonding layer is arranged below the moisture-proof layer, and the film layer is bonded on the moisture-proof layer through the first bonding layer; the damp-proof layer is specially arranged on the thin film layer, is made of a non-porous plastic material and can prevent water from entering the CTA layer; this function simplifies installation as it alleviates the common problems associated with moisture absorption, such as curl or adhesion failure; the moisture-proof layer and the bonding layers arranged above and below the moisture-proof layer enable the assembly to achieve effective adhesive force and durability, and the shape of the thin film layer is kept in the installation process. The device is especially suitable for scenes requiring simple and convenient installation, repeated use and environmental factor resistance, and meanwhile, the functional advantages of polarized light transmission and privacy display are kept.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of laminated film assembly for glass surface, in particular to a film assembly with moisture-proof function. BACKGROUND

[0002] In the process of installing and applying polarizing film on glass surface, the inherent problem for a long time has been the source of headache and low efficiency for professional installers and users. In the field of window film, especially those window films using cellulose triacetate (CTA) layer for light polarization and display shielding, the existing solutions have shown many limitations, which greatly hinder their practicability and versatility. These problems are particularly prominent during the installation process, because the interaction between the film material and moisture can cause some problems.

[0003] In the past, when using CTA film, care was needed to prevent moisture from entering. CTA, although having polarizing properties, is extremely hygroscopic. This property can affect the shape of the material. If exposed to water or water-based solutions during application, the CTA layer will usually absorb moisture, leading to curling, warping or adhesion failure. These problems make it difficult to install such films, require a lot of work, are prone to errors, and rely on specialized techniques to reduce moisture-related damage.

[0004] Some existing methods, such as those based on polyethylene terephthalate (PET), attempt to solve some of these problems by performing dry installations. However, while PET-based adhesives do enable dry applications, this process is often impractical due to the inherent properties of the adhesive, as it makes it extremely difficult to position and adjust the film on the glass surface. This difficulty is exacerbated by the strong initial tackiness of the adhesive, which limits repositioning and increases the likelihood of errors during installation. SUMMARY

[0005] The utility model aims at providing a film assembly with moisture-proof function, which provides improvement compared with existing solutions in the field of privacy protection and display security film. The utility model solves the problems faced by cellulose triacetate (CTA) layer in installation and performance, especially those caused by moisture absorption, installation complexity and limitations of existing adhesive systems.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a film assembly with moisture-proof function, comprising a film layer and a moisture-proof layer, a first adhesive layer is arranged above the moisture-proof layer, a second adhesive layer is arranged below the moisture-proof layer, and the film layer is adhered to the moisture-proof layer through the first adhesive layer.

[0007] Preferably, the moisture barrier layer employs a non-porous plastic material layer, the moisture barrier layer includes any one of a polycarbonate layer, an acrylic layer, a polystyrene layer, a polyethylene layer, a polypropylene layer, a thermoplastic polyurethane layer, a nylon layer, or a polymethyl pentene layer.

[0008] Preferably, the first adhesive layer includes any one of a cyanoacrylate layer, an epoxy layer, a polyurethane layer, or a solvent-based adhesive layer.

[0009] Preferably, the second adhesive layer employs a physical adhesive layer, the surface of the physical adhesive layer is textured, and the physical adhesive layer is provided with micro-suction structures.

[0010] Preferably, the physical adhesive includes any one of a polyethylene terephthalate layer, a polyvinyl chloride layer, a silicone layer, or a thermoplastic polyurethane layer.

[0011] Preferably, the second adhesive layer further includes an acrylic adhesive layer.

[0012] Preferably, the film layer employs a cellulose triacetate layer, and the cellulose triacetate layer is provided with a first protective liner.

[0013] Preferably, the cellulose triacetate layer is provided with an ultraviolet protection layer.

[0014] Preferably, the ultraviolet protection layer includes a UV layer.

[0015] Preferably, the second adhesive layer is provided with a second protective liner.

[0016] Compared with the prior art, the utility model has the advantages that: the utility model is provided with a moisture barrier layer, which is arranged on the film layer and is composed of non-porous plastic material, so that water can be prevented from entering the CTA layer; the function simplifies installation, because it alleviates common problems related to moisture absorption, such as curling or adhesion failure.

[0017] The moisture barrier layer and the adhesive layers arranged above and below the moisture barrier layer enable the assembly to achieve effective adhesion and durability, and maintain the shape of the film layer during installation. The application is particularly suitable for scenarios that require simple installation, reusability, and resistance to environmental factors (such as moisture), while maintaining the advantages of polarized light transmission and display privacy.

[0018] The second adhesive layer employs a physical adhesive layer, and the surface of the physical adhesive layer is textured, so as to enhance mechanical adhesion and intermolecular forces, that is, to increase the strength of adhesion and reduce the possibility of falling off during use.

[0019] The physical adhesive layer is provided with micro-adsorption structures, which are designed to facilitate a vacuum seal with the glass surface, this feature enhances the repositionability of the film assembly, allowing multiple installations without affecting the adhesion. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 Figure 1 is a schematic representation of the structural layers of the film assembly of the present application;

[0021] Figure 2 Figure 2 is a representation of the film assembly of the present application, where the protective liner has been removed, showing the film adhered to the glass substrate and the polarization of light.

[0022] Figure 3 Figure 3 is an example of the application of the film assembly of the present application on an LED screen, showing its polarizing effect and the masking of the displayed content. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0024] The present application provides a film assembly with moisture-proof function, which is designed for glass surfaces.

[0025] The assembly comprises a film layer, which is designed to polarize light, thus providing privacy protection or masking the displayed content when applied; it also comprises a moisture-proof layer, which is located below the film layer and is composed of non-porous plastic material, preventing moisture from entering the film layer, this function simplifies the installation, as it alleviates common problems related to moisture absorption, such as curling or adhesion failure.

[0026] The moisture-proof layer of the assembly comprises a layered adhesive system, i.e. a first adhesive layer is provided on the upper surface of the moisture-proof layer, for mutual adhesion with the film layer, and a second adhesive layer is provided on the lower surface of the moisture-proof layer, for adhering the film assembly to the glass surface or other supporting substrate; thus enabling the assembly to achieve effective adhesion and durability, preserving the shape of the film layer during installation. This invention is particularly suitable for scenarios that require easy installation, reusability and resistance to environmental factors such as moisture, while maintaining the functional advantages of polarized light transmission and display privacy.

[0027] In some embodiments, the thin film layer refers to a triacetate cellulose layer 102, also known as CTA layer, capable of polarizing light; this includes but is not limited to triacetate cellulose, or any other material known to those skilled in the art that has polarizing light properties, such as cellulose derivatives or polarizing light polymers;

[0028] In one example implementation, the CTA layer can be a triacetate cellulose film with a thickness of approximately 100 microns, treated to enhance its light polarization efficiency, for display content blocking and privacy protection;

[0029] In further embodiments, the CTA layer is treated to improve its light polarization efficiency, thus improving the ability of the assembly to block display content and provide privacy when applied to a glass surface.

[0030] In some embodiments, the moisture barrier layer includes a structural layer made of a material selected from polycarbonate (PC), acrylic (PMMA), polystyrene (PS), polyethylene (PE), polypropylene (PP), thermoplastic polyurethane (TPU), nylon or polymethylpentene (PMP), the use of these materials improves the moisture barrier properties of the assembly, ensuring long-term use and stability;

[0031] The aforementioned moisture barrier layer includes but is not limited to a structural layer made of polycarbonate (PC), acrylic (PMMA), polyethylene terephthalate (PET) or thermoplastic polyurethane (TPU) and the like;

[0032] In one example implementation, the moisture barrier layer can also be a polycarbonate film, the thickness of which is optimized to strike a balance between installation flexibility and maintaining structural stability;

[0033] In further embodiments, the thickness of the moisture barrier layer is optimized to balance flexibility and rigidity, both facilitating application and maintaining structural integrity during use.

[0034] In some embodiments, the adhesive used in the first adhesive layer includes a structural layer made of cyanoacrylate, epoxy, polyurethane or solvent-based adhesive and the like. These adhesives ensure firm adhesion between the layers, maintaining the integrity of the assembly under different environmental conditions.

[0035] In some embodiments, the second adhesive layer uses a physical adhesive layer, which adheres to the glass surface through mechanical adhesion and intermolecular forces, avoiding the use of chemical adhesives. This feature facilitates cleaning removal and repositioning of the assembly without leaving residues on the glass.

[0036] The physical adhesive layer described above comprises a structural layer made of materials such as polyethylene terephthalate (PET), polyvinyl chloride (PVC), silicone or thermoplastic polyurethane (TPU) and the like. It adheres to the glass surface primarily through mechanical and intermolecular forces, thus enabling repositioning and residue-free removal; these materials provide enhanced adhesion and compatibility with various glass surfaces, while maintaining flexibility and durability.

[0037] In some embodiments, the second adhesive layer can also employ acrylic adhesives or other suitable adhesives that bond the moisture barrier layer to the glass surface or the physical adhesive layer, which provide strong and reliable adhesion while offering flexibility in substrate selection;

[0038] In one example implementation, the second adhesive layer can be a pressure sensitive acrylic adhesive with a thickness of 50 microns, optimized for clean removal and reusability.

[0039] Alternatively, in another implementation, the second adhesive layer can be used as a traditional adhesive layer, such as a pressure sensitive acrylic adhesive, for direct bonding to the glass surface. The material selection for this layer depends on the intended application and specific user requirements.

[0040] In further embodiments, the physical adhesive layer includes surface modifications such as texturing to enhance mechanical adhesion and intermolecular forces. This increases the strength of adhesion and reduces the likelihood of shedding during use;

[0041] The physical adhesive layer also includes micro-suction structures designed to facilitate vacuum sealing to the glass surface. This feature enhances the repositionability of the film assembly, allowing multiple installations without affecting adhesion.

[0042] In one example implementation, the physical adhesive layer can be a PET film with micro-suction structures or surface texturing to enhance adhesion to glass without the need for chemical adhesives.

[0043] In some embodiments, the moisture-resistant film assembly further includes a first protective liner covering the cellulose triacetate layer 102 and a second protective liner covering the second adhesive layer to protect the adhesive prior to use. This ensures the integrity of the adhesive during storage and handling;

[0044] The protective liner described above refers to a removable layer used to protect the adhesive layer during storage and handling. This includes but is not limited to polyester film, polyethylene film or any other release material commonly used in adhesive backing laminates. In one example implementation, the protective liner can be a silicone-coated polyethylene terephthalate (PET) film for easy peeling without damaging the underlying adhesive.

[0045] In a further embodiment, the design of the moisture resistant film assembly allows touch screen signals to be transmitted through the CTA layer and the moisture barrier layer, enabling its use on a display screen without interference.

[0046] In a further embodiment, the moisture resistant film assembly further comprises an ultraviolet (UV) protective layer, integrated in the CTA layer or coated on the surface of the CTA layer. This layer provides UV filtering function to protect the underlying surface or display screen from UV radiation.

[0047] The UV protective layer as described above refers to a layer integrated in the CTA layer or coated on the CTA layer, which provides UV filtering function. This includes but is not limited to UV film or coating added during manufacturing or post-processing;

[0048] In an example implementation, the UV protective layer can be a transparent film made of UV absorbing material, such as a compound of benzotriazole, which is bonded to the CTA layer to protect the underlying surface or display screen from UV radiation.

[0049] Select one of the embodiments for detailed introduction, please refer to Figure 1 , the layered structure of the moisture resistant film assembly;

[0050] As shown in Figure 1 , the assembly first includes a removable first protective liner 100. This layer is used to protect the adhesive below it during storage and handling, ensuring that the adhesive remains clean and effective before the film assembly is ready for installation. The first protective liner 100 is removed before application to expose the adhesive surface.

[0051] Immediately below the first protective liner 100 is the cellulose triacetate layer 102, which is a light polarizing film used to provide privacy protection and display content blocking. The CTA layer 102 is treated to enhance its light polarization efficiency, ensuring that light passing through the assembly is filtered or polarized, making it particularly useful in situations where privacy protection or display security is required.

[0052] The first adhesive layer 104 firmly adheres the CTA layer 102 to the underlying structure while maintaining optical clarity and structural stability.

[0053] The moisture barrier layer 106 is located below the adhesive layer 104, which is made of a non-porous plastic material designed to prevent moisture from penetrating the CTA layer 102. The moisture barrier layer 106 significantly improves the durability of the assembly by preventing problems such as curling, warping or adhesion failure caused by moisture penetration. Its thickness is optimized to strike a balance between application convenience and structural integrity.

[0054] Below the moisture barrier 106 is the second adhesive layer, which is either an adhesive layer or a physical adhesive layer 108. Its function is to bond the entire film assembly to the glass surface or other supporting substrate. This layer is versatile and can be used in one of the two forms.

[0055] A protective liner 110 is located beneath the adhesive layer or physical adhesion layer 108. This protective liner 110 protects the adhesive layer 108 during storage and handling, ensuring its integrity until the membrane assembly is ready for application. All layers except the protective liner are transparent.

[0056] like Figure 2 As shown, a moisture-proof thin-film assembly has been removed, revealing that the layers are in direct contact with the glass substrate 112, and that unpolarized light is transmitted through it. This illustration highlights the assembly during or after installation, demonstrating its ability to firmly adhere to the glass substrate 112 and its performance in terms of polarized light.

[0057] like Figure 2 As shown, the bottom layer of this component is a second adhesive layer 108, which in this example is made of polyethylene terephthalate (PET). The PET layer, acting as a physical adhesive layer, is mechanically bonded to the surface of the glass substrate 112 through intermolecular forces, mechanical adhesion between the two imperfectly flat surfaces, and the resulting vacuum pressure, as shown in the magnified area. This configuration ensures strong adhesion while allowing for clean removal and repositioning, a function enabled by the properties of PET.

[0058] Above the PET layer is a moisture barrier 106, which is made of a non-porous plastic material such as polycarbonate (PC), acrylic (PMMA), or thermoplastic polyurethane (TPU). The moisture barrier 106 prevents moisture intrusion and protects the upper cellulose triacetate (CTA) layer from damage or degradation. This design ensures the long-term durability and stability of the film assembly, even in humid environments.

[0059] The CTA layer is bonded to the first adhesive layer 104 on the moisture barrier layer, ensuring a strong connection between the two components while maintaining optical clarity. This first adhesive layer 104 (which may contain materials such as cyanoacrylate, polyurethane, or epoxy resin) is specifically chosen for its compatibility with the moisture barrier layer 106 and the CTA layer.

[0060] The CTA layer is on top of the assembly and acts as an active light polarizing assembly. When unpolarized light 114 enters the assembly from the glass substrate 112, it passes through the PET layer 108, the moisture barrier layer 106, and the adhesive layer 104 without significant change. However, when the light reaches and passes through the CTA layer 102, the light becomes polarized light 116. This process filters the light, allowing only light waves of a specific orientation to pass, thereby providing privacy protection, reducing glare, or other desired optical effects as needed by the user.

[0061] In addition, the moisture-proof film assembly has more choices for the design of the moisture-proof film, and the moisture-proof layer can use a series of moisture-proof substrates,

[0062] Among them, acrylic (PMMA), also known as organic glass or acrylic, is a widely used material with good adhesion to cyanoacrylate, epoxy resin and solvent-based adhesive;

[0063] Among them, polycarbonate (PC) has high durability and impact resistance, and is compatible with cyanoacrylate, epoxy resin and polyurethane adhesive;

[0064] Polyethylene terephthalate (PET or PETG), commonly found in packaging materials, has good adhesion to polyurethane and silicone-based glue, and can further improve adhesion through flame or plasma surface treatment. Polystyrene (PS) is commonly used for modeling and packaging, and has good adhesion to special plastic adhesives. Polyvinyl chloride (PVC) can be effectively bonded with solvent-based special PVC adhesives, while polypropylene (PP) and polyethylene (PE) require special adhesives or surface treatment to improve adhesion. Thermoplastic polyurethane (TPU) is flexible and suitable for hot melt glue, polyurethane adhesive and epoxy resin. Other options include cellulose acetate, which has good adhesion to cyanoacrylate and epoxy resin adhesives, and nylon (polyamide), which has good adhesion to epoxy resin or polyurethane adhesives. Polymethylpentene (PMP) is a lightweight and transparent material that adheres well to adhesives designed for polyolefins,

[0065] In summary, each substrate has unique properties and good compatibility with specific adhesives.

[0066] Please refer to Figure 3 which shows a perspective view of applying the moisture-proof film assembly to the LED screen 200, demonstrating the function of the assembly to polarize light and shield display content. As shown, the assembly is adhered to the surface of the LED screen 200 and controls the transmission of light emitted from the screen, thereby providing privacy protection or enhancing display security.

[0067] Working Principle: To achieve the best bonding results, the LED screen 200 surface needs to be cleaned, and then the second protective liner 110 on the film assembly is removed before use.

[0068] Then the film assembly with moisture-proof function is installed on the LED screen 200, at this time the second adhesive layer 108 (in this example as a PET physical adhesion layer) is in direct contact with the screen surface. The PET layer is mechanically adhered to the screen surface without the use of chemical adhesives, ensuring a secure attachment, while also facilitating removal or repositioning. Above the PET layer is a moisture barrier that prevents moisture from penetrating the upper layers of the assembly. The moisture barrier is composed of non-porous plastic materials such as polycarbonate (PC) or acrylic (PMMA), protecting the upper layers from a humid environment and maintaining the performance of the assembly.

[0069] The light emitted by the LED screen 200 passes through the film assembly. The non-polarized light 202 on the screen enters the assembly, passing through the PET layer, the moisture barrier, and the adhesive layer in sequence, with little change. When the light reaches the CTA layer 102, the light is polarized, allowing only light waves in a specific direction to pass through. This polarization phenomenon is illustrated in the figure, with the resulting light polarization zone 204 depicted as selective transmission. This polarization effect obscures the display content, providing privacy and security for the display.

[0070] When viewed from an angle outside the CTA layer, the portion 204 of the LED screen 200 covered by the laminated film assembly appears dark or obscured.

[0071] In summary, the present utility model overcomes these shortcomings by integrating a moisture barrier layer between the CTA layer and the adhesive. This non-porous plastic layer acts as a strong barrier, effectively preventing moisture from penetrating the CTA layer during installation and after installation. The presence of the moisture barrier layer allows the use of a wet installation method, simplifying the positioning and adjustment of the film, while avoiding the moisture-related problems commonly found in previous systems. In addition, the layered design ensures that the film has strong and reliable adhesion to glass surfaces or other substrates, maintaining the structural integrity and optical clarity of the film.

[0072] Although embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present utility model, and the scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A thin-film assembly with moisture-proof function, characterized in that: It includes a thin film layer and a moisture barrier layer (106). A first adhesive layer (104) is provided above the moisture barrier layer (106), and a second adhesive layer (108) is provided below the moisture barrier layer (106). The thin film layer is bonded to the moisture barrier layer (106) by the first adhesive layer (104).

2. The thin-film assembly with moisture-proof function according to claim 1, characterized in that: The moisture-proof layer (106) is made of a non-porous plastic material layer, which includes any one of the following: polycarbonate layer, acrylic layer, polystyrene layer, polyethylene layer, polypropylene layer, thermoplastic polyurethane layer, nylon layer or polymethylpentene layer.

3. The thin-film assembly with moisture-proof function according to claim 1, characterized in that: The first adhesive layer (104) includes any one of a cyanoacrylate layer, an epoxy resin layer, a polyurethane layer, or a solvent-based adhesive layer.

4. The thin-film assembly with moisture-proof function according to claim 1, characterized in that: The second adhesive layer (104) is a physical adhesive layer with a textured surface and a micro-adsorption structure inside.

5. The thin-film assembly with moisture-proof function according to claim 4, characterized in that: The physical adhesive includes any one of a polyethylene terephthalate layer, a polyvinyl chloride layer, a silicone layer, or a thermoplastic polyurethane layer.

6. The thin-film assembly with moisture-proof function according to claim 1, characterized in that: The second adhesive layer (104) also includes an acrylic adhesive layer.

7. The thin-film assembly with moisture-proof function according to claim 1, characterized in that: The film layer is a triacetate cellulose layer (102), and a first protective pad (100) is provided on the triacetate cellulose layer.

8. The thin-film assembly with moisture-proof function according to claim 7, characterized in that: The cellulose triacetate layer (102) is provided with an ultraviolet protection layer.

9. The thin-film assembly with moisture-proof function according to claim 8, characterized in that: The ultraviolet protection layer includes a UV layer.

10. The thin-film assembly with moisture-proof function according to claim 1, characterized in that: A second protective pad (110) is provided below the second adhesive layer (108).

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