High-transparency polyester film

Abstract

The utility model discloses a high-transparency polyester film, and belongs to the technical field of polyester films. Mainly comprises an inner layer, a middle layer and an outer layer, the outer side of the inner layer is surrounded by the middle layer, the outer side of the middle layer is surrounded by the outer layer, the inner layer is a high-transparency polyester layer, the middle layer is a polyvinyl alcohol layer providing toughness and ductility, and the outer layer is a polyethylene glycol terephthalate layer providing external protection. And the inner layer is made of a high-transparency polyester material, so that light can better penetrate through the film, and the overall transparency is improved. The middle polyvinyl alcohol layer provides toughness and ductility without significantly affecting transparency, and the optical anti-reflection film is bonded on the surface of the polyethylene glycol terephthalate layer, so that the light transmittance can be further improved, the light reflection and scattering phenomena are reduced, the overall transparency is improved, and the visual effect is improved.

Description

Technical Field

[0001] The present application relates to the technical field of polyester films, and in particular to a polyester film with high transparency. Background Art

[0002] Polyester film is a type of film made from polyester, the most common type being polyethylene terephthalate (PET). Due to its excellent physical, chemical, and mechanical properties, polyester film is widely used in a variety of applications, such as packaging, electronics, optical devices, and medical supplies.

[0003] A search revealed the publication number CN210652219U, which discloses a highly transparent polyester film comprising a polyethylene terephthalate layer, a wear-resistant layer, a transparent layer, and a protective layer. The wear-resistant layer is connected to the polyethylene terephthalate layer at its lower end, the transparent layer is connected to the upper end of the wear-resistant layer at its lower end, and the upper end of the transparent layer is connected to the lower end of the protective layer. The transparent layer is made of polymethyl methacrylate, and the protective layer is made of a polyurethane resin. This utility model has a simple structure and utilizes the high transparency of polymethyl methacrylate to effectively enhance the transparency of the polyester film. This significantly improves the transparency of the polyester film, effectively resolving the issue of low transparency, contributing to increased market adoption of the film and improving the economic benefits of production.

[0004] However, although existing polyester films can have a certain degree of transparency, in the packaging industry, the higher the transparency of polyester films, the better the visibility of the products. Consumers can see the products intuitively, which is crucial for increasing the attractiveness and sales of goods. In some optical applications, such as optical instruments and display devices, the transparency of the film directly affects the transmission of light and the clarity of the image, so the transparency needs to be improved to meet high performance requirements.

[0005] Therefore, it is necessary to provide a polyester film with high transparency to solve the above problems.

[0006] It should be noted that the above information disclosed in this Background section is only for understanding the background technology of the present application concept, and therefore, it may contain information that does not constitute the prior art. Utility Model Content

[0007] The purpose of the present invention is to provide a highly transparent polyester film to solve the problems raised in the above background technology.

[0008] The technical solution adopted by this application to solve its technical problems is:

[0009] A highly transparent polyester film comprises an inner layer, a middle layer and an outer layer. The inner layer is surrounded by the middle layer on the outside, and the middle layer is surrounded by the outer layer on the outside. The inner layer is a highly transparent polyester layer, the middle layer is a polyvinyl alcohol layer that provides toughness and ductility, and the outer layer is a polyethylene terephthalate layer that provides external protection.

[0010] Preferably, an optical antireflection film is adhered to the surface of the polyethylene terephthalate layer via an adhesive.

[0011] Preferably, the surface of the optical anti-reflection film is sprayed with an anti-reflection coating.

[0012] Preferably, the outer side of the polyester layer and the inner side of the polyvinyl alcohol layer are combined with each other via a polyethylene wax compatibilizer.

[0013] Preferably, the outer side of the polyvinyl alcohol layer and the inner side of the polyethylene terephthalate layer are adhered to each other by a water-based adhesive.

[0014] Preferably, the thickness of the polyethylene terephthalate layer is 5-20 μm, the thickness of the polyvinyl alcohol layer is 5-30 μm, and the thickness of the polyester layer is 10-50 μm.

[0015] The beneficial effects of this application are:

[0016] The polyester film of this application utilizes a multi-layer structural design and a specific material combination. The inner layer utilizes a highly transparent polyester material, allowing light to better penetrate the film, thereby improving overall transparency. The polyvinyl alcohol layer in the middle layer provides toughness and ductility without significantly affecting transparency. The optical anti-reflection film bonded to the surface of the polyethylene terephthalate layer further enhances light transmittance, reduces light reflection and scattering, and thus improves overall transparency and visual quality. Furthermore, the anti-reflection coating sprayed on the surface of the optical anti-reflection film effectively reduces light reflection and improves light transmission efficiency, which is particularly important for certain optical devices and packaging applications, providing clearer and more realistic visual effects.

[0017] In addition to the above-described purposes, features and advantages, the present application also has other purposes, features and advantages. The present application will be further described in detail below with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings in the specification, which constitute a part of this application, are used to provide further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute improper limitations on this application.

[0019] In the attached figure:

[0020] Figure 1This is an overall schematic diagram of a highly transparent polyester film of the present invention;

[0021] Figure 2 For the utility model Figure 1 A in the middle is an enlarged structural diagram;

[0022] Figure 3 This is a schematic diagram of the overall cross-sectional structure of the polyester film of the present invention.

[0023] Among them, the reference numerals in the figures are:

[0024] 1. Polyethylene terephthalate layer;

[0025] 2. Polyvinyl alcohol layer;

[0026] 3. Polyester layer;

[0027] 4. Optical anti-reflection film;

[0028] 5. Anti-reflective coating. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0030] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings 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 in the present invention, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present invention.

[0031] See also Figure 1-3 , the embodiment provided by the utility model:

[0032] A highly transparent polyester film includes an inner layer, a middle layer and an outer layer. The inner layer is surrounded by the middle layer on the outside, and the middle layer is surrounded by the outer layer on the outside. The polyester film is realized by a multi-layer material structure. This structure can combine the advantages of different materials to improve the overall transparency and other properties of the film.

[0033] The inner layer is a highly transparent polyester layer 3, and the middle layer is a polyvinyl alcohol layer 2 that provides toughness and ductility. The outer side of the polyester layer 3 and the inner side of the polyvinyl alcohol layer 2 are combined with a polyethylene wax compatibilizer. Although the compatibility of polyvinyl alcohol and the polyester layer 3 is low, the interface bonding between the polyester layer 3 and the polyvinyl alcohol layer 2 can be improved by adding appropriate plasticizers or compatibilizers, such as polyethylene wax.

[0034] The outer layer is a polyethylene terephthalate layer 1 that provides external protection. The outer side of the polyvinyl alcohol layer 2 is bonded to the inner side of the polyethylene terephthalate layer 1 by a water-based adhesive. The water-based adhesive is used to enhance the interfacial bonding strength between the polyvinyl alcohol and the polyethylene terephthalate.

[0035] Furthermore, an optical anti-reflection film 4 is adhered to the surface of the polyethylene terephthalate layer 1 by an adhesive. The optical anti-reflection film 4 can enhance the transmittance of light and reduce reflection loss, thereby improving the overall transparency.

[0036] In addition, an anti-reflection coating 5 is sprayed on the surface of the optical anti-reflection film 4. Coating a layer of anti-reflection coating 5 on the surface of the optical anti-reflection film 4 can significantly reduce the reflection of light, thereby improving the transmittance of light.

[0037] The thickness of the polyethylene terephthalate layer 1 is 5-20μm, the thickness of the polyvinyl alcohol layer 2 is 5-30μm, and the polyester layer 3 is 10-50μm. Assuming that the total thickness of the film is 60μm, the thickness of the polyethylene terephthalate layer 1 is 10μm, the thickness of the polyvinyl alcohol layer 2 is 20μm, and the thickness of the polyester layer 3 is 30μm. The outer polyethylene terephthalate layer 1 provides the necessary physical protection and UV protection for the polyester film, the middle polyvinyl alcohol layer 2 enhances the toughness and adhesion of the polyester film, and the inner polyester layer 3 ensures the overall strength and transparency. The multi-layer design not only optimizes the optical and mechanical properties of the polyester film, but also can meet different application requirements by adjusting the material and thickness ratio.

[0038] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A highly transparent polyester film, characterized in that: The invention comprises an inner layer, a middle layer and an outer layer, wherein the outer side of the inner layer is surrounded by the middle layer, and the outer side of the middle layer is surrounded by the outer layer, wherein the inner layer is a highly transparent polyester layer (3), the middle layer is a polyvinyl alcohol layer (2) providing toughness and ductility, and the outer layer is a polyethylene terephthalate layer (1) providing external protection.

2. The highly transparent polyester film according to claim 1, characterized in that: The outer surface of the polyethylene terephthalate layer (1) is adhered with an optical antireflection film (4) via an adhesive.

3. The highly transparent polyester film according to claim 2, characterized in that: The surface of the optical anti-reflection film (4) is sprayed with an anti-reflection coating (5).

4. The highly transparent polyester film according to claim 1, wherein: The outer side of the polyester layer (3) and the inner side of the polyvinyl alcohol layer (2) are combined with each other via a polyethylene wax compatibilizer.

5. The highly transparent polyester film according to claim 4, characterized in that: The outer side of the polyvinyl alcohol layer (2) and the inner side of the polyethylene terephthalate layer (1) are adhered to each other via a water-based adhesive.

6. The highly transparent polyester film according to claim 5, characterized in that: The thickness of the polyethylene terephthalate layer (1) is 5-20 μm, the thickness of the polyvinyl alcohol layer (2) is 5-30 μm, and the thickness of the polyester layer (3) is 10-50 μm.

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