Anti-fog heat seal film

Abstract

To provide a heat seal film which reduces the occurrence of fogging. The anti-fog heat seal film (1) includes a heat seal layer (10) and an anti-fog layer (20), the heat seal layer having a bottom surface (11) and a top surface (12) opposite the bottom surface. The anti-fog layer is provided on the top surface of the heat seal layer.

Description

[Technical Field]

[0001] The present invention relates to a heat seal film, especially an anti-fog heat seal film. [Background technology]

[0002] Transparent packaging films are widely used for packaging food, medicines, and other products whose contents must be visible. A common packaging method is to use a heat-sealable film, and seal the edges of the film by heat and pressure to form a sealed packaging bag. Such heat-sealable films generally have good transparency and sealing properties, and can prevent external water vapor or oxygen from entering the inside of the package.

[0003] However, conventional heat seal films often suffer from impaired visibility in various situations during actual use, particularly when packaging hot or cold drinks or food, where water vapor generated by temperature differences condenses and clouds the inside of the film or the sealed area, causing a phenomenon known as "fogging." This clouding causes a loss of transparency on the film surface, making it difficult for consumers to see the contents of the package, which affects the product's appearance and market competitiveness. Summary of the Invention [Problem to be solved by the invention]

[0004] The main purpose of this invention is to solve the problem that conventional heat seal films tend to become cloudy on the inside or at the seal area of ​​the film. [Means for solving the problem]

[0005] The present invention discloses an anti-fog heat seal film, comprising a heat seal layer and an anti-fog layer, the heat seal layer having a bottom surface and a top surface opposite the bottom surface, and the anti-fog layer disposed on the top surface of the heat seal layer. [Brief explanation of the drawings]

[0006] [Figure 1] FIG. 1 is a perspective view of an embodiment of the present invention. [Figure 2] 1 is a schematic diagram of each layer of an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0007] The terms used herein are not intended to limit the invention but to describe particular embodiments. As used herein, the singular forms "a," "an," and "the" can include the plural unless the context clearly dictates otherwise.

[0008] The directional terms used in this specification, such as up, down, left, right, front, rear, and their derivatives or synonyms, do not limit the present invention but relate to the orientation of elements in the drawings. Unless otherwise clearly stated in the context or to clearly show the features of the present invention, the present invention is not described based on actual dimensional relationships. The technical content of the present invention will be described in detail below with reference to the drawings. Referring to FIG. 1, the present invention discloses an anti-fog heat seal film 1 that can be wound around an annular bracket 1a so that a user can use the anti-fog heat seal film 1 through an auxiliary device (e.g., a sealing machine).

[0009] Referring to FIG. 2, the anti-fog heat seal film 1 includes a heat seal layer 10 and an anti-fog layer 20, and the anti-fog layer 20 is disposed on the heat seal layer 10. In this example, the surface area of ​​the heat seal layer 10 is equal to the surface area of ​​the anti-fog layer 20, that is, the heat seal layer 10 and the anti-fog layer 20 are completely overlapped.

[0010] In one example, the anti-fog heat seal film 1 has a thickness t1, which is between 20 μm and 80 μm, the thickness t2 of the heat seal layer 10 is greater than the thickness t3 of the anti-fog layer 20, and the thickness t3 of the anti-fog layer 20 is between 0.1% and 5% of the thickness t2 of the heat seal layer.

[0011] The heat-sealing layer 10 includes a bottom surface 11 and a top surface 12, and the bottom surface 11 and the top surface 12 are located on opposite sides. In this example, the heat-sealing layer 10 is a polyethylene terephthalate layer, which can be used for heat-sealing food products and is therefore a food-grade heat-sealing layer. The polyethylene terephthalate layer has good heat-sealing properties, light transmittance, abrasion resistance, dimensional stability, gas barrier properties, heat shrinkage resistance, food safety, and recyclability.

[0012] The anti-fog layer 20 is applied to the upper surface 12 of the heat-seal layer 10. The anti-fog layer 20 includes an anti-fog agent, a surface modifier, and a functional additive. In this invention, the upper surface 12 of the heat-seal layer 10 is first surface-treated, then coated with a mixed solution. The mixed solution is then photo-cured by irradiating ultraviolet light to form the anti-fog layer 20. The mixed solution may include, but is not limited to, a mixture of the anti-fog agent, the surface modifier, and the functional additive. In this example, the anti-fog agent is selected from, but is not limited to, polyvinyl alcohol (PVA) and acrylic acid, the surface modifier is selected from, but is not limited to, polyether-modified siloxane (PEO-PDMS) wetting aids, and the functional additive is selected from, but is not limited to, benzotriazole.

[0013] By photocuring the mixed solution containing the anti-fogging agent, the surface modifier, and the functional additive on the upper surface 12 of the heat seal layer 10, the anti-fogging layer 20 can be formed without affecting the properties of the heat seal layer 10, such as heat sealability, light transmittance, abrasion resistance, dimensional stability, gas barrier properties, heat shrinkage resistance, food safety, and recyclability.

[0014] As can be seen from the above, the anti-fogging layer disclosed in the present invention is formed by photo-curing a mixed solution, which contains an anti-fogging agent, a surface modifier, and a functional additive. The mixed solution does not affect the properties of the heat-sealable layer even after photo-curing, thereby achieving the effects of simultaneously taking into consideration heat-sealability, anti-fogging properties, and food safety. [Explanation of symbols]

[0015] 1. Anti-fog heat seal film 1a Annular bracket 10 Heat seal layer 11 Bottom 12 Top side 20 Anti-fog layer t1 thickness t2 thickness t3 thickness

Claims

1. An anti-fog heat seal film, a heat seal layer including a bottom surface and a top surface opposite the bottom surface; an anti-fogging layer provided on the upper surface of the heat seal layer; An anti-fog heat seal film comprising:

2. 2. The anti-fog heat seal film according to claim 1, wherein the thickness of the anti-fog heat seal film is between 20 μm and 80 μm.

3. 2. The anti-fog heat seal film of claim 1, wherein the thickness of the anti-fog layer is between 0.1% and 5% of the thickness of the heat seal layer.

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