Double-sided processed barrier film

Abstract

The utility model relates to a double-sided processed barrier film, which comprises a base material, which comprises a first surface and a second surface which are oppositely arranged; the processing layer is arranged on the first surface and the second surface of the base material; the barrier plating layer is arranged on one side, far away from the base material, of the treatment layer, and the barrier plating layer is used for blocking gas molecules from passing through; the protective coating is arranged on the side, away from the treatment layer, of the barrier plating layer, and the protective coating is used for protecting the barrier plating layer and blocking gas molecules; wherein the treatment layer, the barrier plating layer and the protective coating layer are symmetrically distributed relative to the base material, and the treatment layer is used for improving the adhesive force between the base material and the barrier plating layer. The processing layers, the barrier plating layers and the protective coatings are symmetrically arranged on the two sides of the base material, the same working procedures can be carried out on the two sides of the base material at the same time during processing, the processing efficiency is effectively improved, stress on the two sides of the base material can be balanced, and curling is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of thin films, in particular to a double-sided processed barrier film. Background Art

[0002] Traditional packaging barrier films generally use PET, nylon or PE as the base material, and then form a multi-layer barrier film stacked on the base material through precision coating and vacuum deposition.

[0003] Existing single-layer coated barrier films have high water vapor transmission rate and oxygen transmission rate, but average barrier performance. At present, in order to improve the barrier performance of barrier films, a multi-layer composite stacking method is usually adopted. That is, inorganic coatings and organic coatings are repeatedly stacked on the processed surface of the substrate. The barrier properties of the barrier film are improved by increasing the number of coatings and coatings. However, this method will greatly increase the thickness of the barrier film and increase the material cost. Moreover, since each layer of coating and plating must be completed through an independent process, the upper coating or coating must be processed after the lower coating or coating is completed, resulting in long processing time and low efficiency. At the same time, since the processing surface is concentrated on one side of the substrate, repeated processing will cause the stress of the processed surface to be significantly higher than that of the non-processed surface, causing the barrier film product to curl and affecting the subsequent bag making work. Utility Model Content

[0004] In view of this, in order to solve the problems existing in the prior art, the present invention provides a double-sided processed barrier film.

[0005] A double-sided barrier film comprises: a substrate comprising a first surface and a second surface arranged opposite to each other; a treatment layer provided on the first and second surfaces of the substrate; a barrier coating provided on a side of the treatment layer away from the substrate, the barrier coating being used to block the passage of gas molecules; a protective coating provided on a side of the barrier coating away from the treatment layer, the protective coating being used to protect the barrier coating and block gas molecules; wherein the treatment layer, the barrier coating and the protective coating are symmetrically distributed about the substrate, and the treatment layer is used to improve the adhesion between the substrate and the barrier coating.

[0006] In the technical scheme, the processing layer is formed on the surface of the base material, and is formed on the base material before the barrier plating layer, so that the adhesion between the base material and the barrier plating layer is increased when the barrier plating layer is processed, the film layer structure is more stable, the barrier plating layer has a barrier function and can block water vapor and other gas molecules, the protective coating also has a barrier function, and is attached to the surface of the barrier plating layer to protect the barrier plating layer; in addition, the processing layer, the barrier plating layer and the protective coating are symmetrically distributed with respect to the base material, the same process can be performed on both sides of the base material during processing, the processing efficiency is improved, and the symmetric structure can balance the stress of the two opposite sides of the base material to avoid curling.

[0007] Optionally, in an embodiment, the barrier plating layer is attached to the surface of the processing layer by physical vapor deposition.

[0008] In the technical scheme, the physical vapor deposition is performed under vacuum conditions, the material is deposited on the processing layer by a physical method to form the required barrier plating layer, and the barrier plating layer obtained by physical vapor deposition is more uniform and dense.

[0009] Optionally, in an embodiment, the protective coating is coated on the surface of the barrier plating layer.

[0010] In the technical scheme, the coating is coated on the surface of the barrier plating layer by coating, and then the coating is solidified to form the required protective coating. The protective coating also has a barrier function, which can further improve the barrier performance of the barrier film together with the barrier plating layer.

[0011] Optionally, in an embodiment, the thickness of the base material is between 6 μm and 100 μm.

[0012] Optionally, in an embodiment, the thickness of the barrier plating layer is between 10 nm and 50 nm.

[0013] Optionally, in an embodiment, the thickness of the protective coating is between 0.1 μm and 2 μm.

[0014] Optionally, in an embodiment, the base material, the processing layer, the barrier plating layer and the protective coating are all transparent structures with good light transmission.

[0015] In the technical scheme, the transparent structure can make the barrier film applied to the packaging industry to realize transparent packaging, which helps to clearly see the packaging contents.

[0016] Compared with the prior art, the barrier film has the following advantages:

[0017] The application is provided with a treatment layer on the substrate, which can strengthen the adhesion between the substrate and the barrier plating layer, and make the overall structure more stable; the application adopts a symmetrical structure design, and the treatment layer, the barrier plating layer and the protective coating are symmetrically arranged, so that the same process can be carried out on both sides of the substrate at the same time during processing, thereby effectively improving the processing efficiency, and the symmetrical structure can also balance the stress on both sides of the substrate, avoiding curling, and at the same time, the application does not need to repeatedly stack the plating layer and the coating on the substrate, so that the barrier property of the barrier film can be improved without greatly increasing the thickness of the barrier film, and the material cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0019] Figure 1 It is a structural schematic diagram of the barrier film of an embodiment.

[0020] Explanation of reference numerals in the drawings:

[0021] 1-substrate; 2-treatment layer; 3-barrier plating layer; 4-protective coating. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the application more clear, the following will combine the drawings in the embodiments of the application to clearly and completely describe the technical solutions in the embodiments of the application, and obviously, the described embodiments are some of the embodiments of the application, but not all the embodiments. The components of the embodiments of the application described and shown in the drawings here can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the application.

[0024] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0025] Please refer to Figure 1The barrier film of one embodiment of the present invention, primarily used in barrier packaging bags, comprises a substrate 1, a treatment layer 2, a barrier coating 3, and a protective coating 4. The substrate 1 comprises a first surface and a second surface disposed opposite each other. The treatment layer 2 is disposed on the first and second surfaces of the substrate to improve adhesion between the substrate 1 and the barrier coating 3. The barrier coating 3 is disposed on the side of the treatment layer 2 facing away from the substrate 1 to block the passage of gas molecules. The protective coating 4 is disposed on the side of the barrier coating 3 facing away from the treatment layer 2 to protect the barrier coating 3 and block gas molecules. The treatment layer 2, barrier coating 3, and protective coating 4 are symmetrically arranged about the substrate 1.

[0026] In this embodiment, the treatment layer 2 is formed by surface processing on the substrate 1, and is formed on the substrate 1 before the barrier coating 3. The treatment layer 2 can increase the adhesion between the substrate 1 and the barrier coating 3, making the film structure more stable. The barrier coating 3 has a barrier function and can block water vapor and other gas molecules. The protective coating 4 also has a barrier function. In conjunction with the barrier coating 3, the barrier performance can be further improved to protect the contents of the packaging bag from being destroyed by oxygen, water vapor or other gases. The protective coating 4 is attached to the surface of the barrier coating 3, which can play a certain protective role on the barrier coating 3 and improve the service life of the barrier film.

[0027] Among them, the treatment layer 2, the barrier coating 3 and the protective coating 4 are symmetrically distributed about the substrate 1. The material and thickness of the treatment layer 2, the barrier coating 3 and the protective coating 4 on both sides are consistent, so that processing can be carried out simultaneously on both sides of the substrate 1 during processing, thereby improving work efficiency. The symmetrical structure can balance the stress on the two relative sides of the substrate 1, avoiding curling during processing and after forming. In addition, there is no need to repeatedly stack coatings and plating layers on one side of the substrate 1 to improve the barrier performance of the barrier film.

[0028] In one embodiment, the material of the substrate 1 is selected from polymer plastics such as PET, PP, PE, or biodegradable materials such as PLA and PBAT. Preferably, the thickness of the substrate 1 is between 6 μm and 100 μm.

[0029] In one embodiment, to ensure the adhesion of the treatment layer 2 to the substrate 1 and the barrier coating 3 , the treatment layer 2 is a coating made of NiCr, SUS or Si. Preferably, the thickness of the treatment layer 2 is 10 nm.

[0030] In one embodiment, the barrier coating 3 is attached to the surface of the treatment layer 2 by physical vapor deposition. The physical vapor deposition is performed under vacuum conditions. The material source is deposited on the treatment layer 2 by physical methods to form the required barrier coating 3. The barrier coating 3 obtained by physical vapor deposition can be made more uniform and dense.

[0031] Specifically, the material of the barrier coating 3 is one or both of SiOx and AlOx. The physical microscopic density of SiOx or AlOx and the adsorption effect of the molecular unsaturated bonds therein on gas molecules are utilized to effectively ensure the barrier performance of the barrier coating 3. Preferably, the thickness of the barrier coating is between 10nm and 50nm.

[0032] It is worth mentioning that the barrier coating 3 is composed of non-metallic compounds, so it can be heated by microwaves and can also pass metal detection, which is more practical.

[0033] In one embodiment, the protective coating 4 is coated on the surface of the barrier coating 3. Specifically, polyurethane or polyvinyl alcohol (PVA) coating is selected, and the coating is evenly coated on the surface of the barrier coating 3 by gravure or narrow slit coating. The coating is then cured by heat baking or UV curing to form the required protective coating 4. The protective coating 4 also has barrier properties against water vapor and gas molecules. Together with the barrier coating 3, it can further enhance the barrier properties of the barrier film and protect the barrier coating 3.

[0034] Preferably, the thickness of the protective coating 4 is between 0.1 μm and 2 μm.

[0035] In one embodiment, the substrate 1, the treatment layer 2, the barrier coating 3 and the protective coating 4 are all transparent structures with good light transmittance, so that when the barrier film is applied to a packaging bag, transparent packaging can be achieved, which helps to clearly see the contents of the packaging and improves practicality.

[0036] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

[0037] In the description of the present invention, it should be understood that terms such as "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0039] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

Claims

1. A double-sided barrier film, characterized in that: include: A substrate comprising a first surface and a second surface disposed opposite to each other; a treatment layer disposed on the first and second surfaces of the substrate; a barrier coating, provided on a side of the treatment layer away from the substrate, the barrier coating being used to block the passage of gas molecules; a protective coating layer, disposed on a side of the barrier coating layer away from the treatment layer, the protective coating layer being used to protect the barrier coating layer and block gas molecules; The treatment layer, the barrier coating and the protective coating are symmetrically distributed with respect to the substrate, and the treatment layer is used to improve the adhesion between the substrate and the barrier coating.

2. The double-sided processed barrier film according to claim 1, characterized in that: The barrier coating is attached to the surface of the treatment layer by physical vapor deposition.

3. The double-sided processed barrier film according to claim 1, characterized in that: The protective coating is covered on the surface of the barrier coating by coating.

4. The double-sided processed barrier film according to claim 1, characterized in that: The thickness of the substrate is between 6 μm and 100 μm.

5. The double-sided processed barrier film according to claim 1, characterized in that: The thickness of the barrier coating is between 10 nm and 50 nm.

6. The double-sided processed barrier film according to claim 1, characterized in that The thickness of the protective coating is between 0.1 μm and 2 μm.

7. The double-sided processed barrier film according to claim 1, characterized in that: The substrate, treatment layer, barrier coating and protective coating are all transparent structures with good light transmittance.

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