Uvioresistant and moistureproof high-barrier transparent cover film for tea leaf packaging

Abstract

The utility model discloses a kind of anti-uv moisture-absorbing high-barrier transparent cover films for tea packaging. The cover film includes: outer barrier film layer, inner heat-seal film layer and base film;The outer barrier film layer includes the base layer of transparent PET material, the high-barrier coating of transparent film structure is formed by vacuum metallizing metal oxide on the lower surface of base layer, the first anti-ultraviolet layer of barrier ultraviolet is formed by printing composite transparent ink on the lower surface of high-barrier coating;The inner heat-seal film layer is transparent RCPP film, and the inner heat-seal film layer includes the corona composite layer, the second anti-ultraviolet layer, the intermediate support layer, the moisture-absorbing layer and the easy-to-rip heat-seal layer distributed in order from outside to inside;The base film is transparent biaxially oriented nylon BOPA film, and the outer barrier film layer is adhered by first glue layer on the upper surface of base film and the inner heat-seal film layer is adhered by second glue layer on the lower surface. The utility model has good transparency, which is convenient for observing tea, excellent anti-UV performance and moisture-absorbing performance to ensure the quality of tea for a long time.

Description

Technical Field

[0001] This utility model relates to the field of tea packaging, and in particular to a transparent cover film for tea packaging that is UV resistant, moisture-absorbing, and highly barrier to use with K-cup cups. Background Technology

[0002] Tea is a common beverage made by brewing tea leaves. Finished tea is typically stored in packaged containers. Currently, tea packaging uses opaque containers (such as metal boxes) or simple transparent plastic bags. The problems with this are twofold: firstly, with the tea sealed in an opaque container, consumers cannot observe the actual condition of the tea inside, hindering quick information acquisition and sales; secondly, using transparent plastic bags exposes the tea to sunlight, making it susceptible to UV damage, and the bags lack moisture-absorbing properties, making it difficult to ensure the tea remains dry. Utility Model Content

[0003] To address one or more of the aforementioned problems, this utility model provides a transparent cover film for tea packaging that is UV resistant, moisture-absorbing, and has high barrier properties.

[0004] According to one aspect of the present invention, a transparent cover film for tea packaging with UV resistance and moisture absorption high barrier includes: an outer barrier film layer, an inner heat-sealing film layer, and a base film.

[0005] The outer barrier film layer includes a base layer of transparent PET material, and a high-barrier coating with a transparent thin film structure formed by vacuum-plating metal oxide on the lower surface of the base layer. A composite transparent ink is printed on the lower surface of the high-barrier coating to form the first anti-ultraviolet layer that blocks ultraviolet rays.

[0006] The inner heat-sealing film layer is a transparent RCPP film, which includes a corona composite layer, a second UV-resistant layer, an intermediate support layer, a moisture-absorbing layer, and an easy-to-peel heat-sealing layer distributed from the outside to the inside.

[0007] The base film is a transparent biaxially oriented nylon BOPA film. The outer barrier film layer is bonded to the upper surface of the base film through a first adhesive layer, and the inner heat-sealing film layer is bonded to the lower surface through a second adhesive layer.

[0008] In some embodiments, the outer barrier film is an ALOx-PET film, and the high-barrier coating is a high-barrier alumina coating with an aluminum-coated thin film structure, having an oxygen permeability (OTR) ≤ 0.5 cm⁻¹. 3 / m 2 ×24h×0.1Mpa, water vapor transmission rate (WVTR) ≤0.5g / m 2 ×24h.

[0009] In some embodiments, the first UV-resistant layer is formed by printing orange-yellow transparent ink or polyurethane ink on the underside of the substrate.

[0010] In some embodiments, the high-barrier coating has a thickness of 30-50 nm, and the first UV-resistant layer has a thickness of 1-2 μm.

[0011] In some embodiments, both the first adhesive layer and the second adhesive layer are polyurethane adhesives.

[0012] In some embodiments, the polyurethane adhesive is a polyurethane adhesive YH3166A / YH3166B with a weight ratio of 20:3.5, a dry coating amount of 3.5 gsm, and a curing time of 50°C / 72 hours.

[0013] In some embodiments, the cover film has a roll structure. A dry laminating device processes the outer barrier film layer, the inner heat-sealing film layer, and the base film to form an intermediate film. A slitting machine cuts the intermediate film, and a winding device forms the intermediate film into the final product roll film.

[0014] In some embodiments, the inner heat-sealing film layer is formed by a five-layer co-extrusion casting apparatus;

[0015] Both the intermediate support layer and the surface corona composite layer are made of copolymer polypropylene resin.

[0016] The easy-peel heat seal layer is made of X305 easy-peel resin.

[0017] In some embodiments, the corona composite layer is 10 μm, the second UV-resistant layer is 15 μm, the intermediate support layer is 15 μm, the moisture-absorbing layer is 15 μm, and the inner heat-sealing layer is 15 μm.

[0018] In some embodiments, the outer barrier film layer is 12 μm; the base film is 15 μm; the inner heat-sealing film layer is 70 μm; and the first adhesive layer and the second adhesive layer are both 3.5 μm.

[0019] This type of UV-resistant, moisture-absorbing, high-barrier transparent lid film for tea packaging is applied to the top of open tea containers (suitable for use on the lids of small cans, bottles, and boxes, especially when used with K-cups), forming a transparent, sealed tea packaging. Its advantages are: First, all three layers of the lid film (outer barrier film, inner heat-sealing film, and base film) are transparent, ensuring excellent transparency and allowing consumers to clearly see the tea inside, facilitating quick information acquisition and purchase. Second, the lid film has a first and second UV-resistant layer with transparent ink, providing excellent UV resistance and effectively preventing light damage to the tea, thus ensuring its long-term quality and shelf life. Third, the base film has a moisture-absorbing layer for good moisture absorption, while the high-performance outer barrier film prevents moisture and foreign matter from entering, ensuring good dryness and preventing long-term deterioration of the tea. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a rolled-up transparent cover film for tea packaging, which is resistant to ultraviolet radiation and moisture absorption and has high barrier properties, according to one embodiment of the present invention.

[0021] Figure 2 for Figure 1 A cross-sectional schematic diagram of the external barrier membrane layer is shown.

[0022] Figure 3 for Figure 1 A cross-sectional schematic diagram of the inner heat-sealing film layer is shown.

[0023] Figure 4 for Figure 1 The diagram shows a cross-sectional view of a transparent, UV-resistant, moisture-absorbing, and highly barrier-free capping film used for tea packaging.

[0024] Outer barrier film layer 1, base layer 10, high barrier coating 11, first UV-resistant layer 12,

[0025] Inner heat-sealing film layer 2, intermediate support layer 20, second UV-resistant layer 21, moisture-absorbing layer 22, corona composite layer 23, easy-to-peel heat-sealing layer 24;

[0026] Base film 3;

[0027] First adhesive layer 4;

[0028] Second adhesive layer 5. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to the directions in the accompanying drawings, while the terms "inner" and "outer" refer to the directions toward or away from the geometric center of a specific component, respectively.

[0030] Figures 1 to 4 The illustration schematically shows a UV-resistant, moisture-absorbing, high-barrier transparent cover film for tea packaging according to one embodiment of the present invention. As shown in the figure, the cover film includes: an outer barrier film layer 1, an inner heat-sealing film layer 2, and a base film 3;

[0031] like Figure 2 As shown, the outer barrier film layer 1 includes a transparent PET base layer 10, a transparent high barrier coating 11, and a transparent first UV-resistant layer 12. This configuration enables the outer barrier film layer to have high transparency, barrier resistance, and UV resistance.

[0032] The lower surface of the base layer 10 is coated with a high-barrier layer 11, which is a transparent thin film structure formed by vacuum-depositing metal oxide. Further, the outer barrier film layer 1 is an ALOx-PET film, and the high-barrier coating 11 is a high-barrier alumina coating formed by vacuum-depositing aluminum on the upper surface of the base layer 10, with an oxygen permeability (OTR) ≤ 0.5 cm⁻¹. 3 / (m 2 (×24h×0.1Mpa), water vapor transmission rate WVTR≤0.5g / (m 2 ×24h); The thickness of the high-barrier coating 11 is preferably 30-50nm. The beneficial effects of the high-barrier coating 11 are: the high-barrier coating 11 has high transparency, excellent barrier performance and processing applicability. Its barrier performance is better than that of K film and it is less affected by the environment. Its PET base layer 10 has high transparency and is environmentally friendly and recyclable.

[0033] A first UV-resistant layer 12 is formed by printing a composite transparent ink on the lower surface of the high-barrier coating 11 to block ultraviolet rays; preferably, the first UV-resistant layer 12 is formed by printing an orange-yellow transparent ink or polyurethane ink on the lower surface of the base layer 10. The thickness of the first UV-resistant layer 12 is preferably 1-2 μm. Its beneficial effect is that this arrangement has good UV resistance.

[0034] like Figure 3 As shown, the inner heat-sealing film layer 2 is a transparent RCPP film, and includes, from the outside to the inside, a corona composite layer 23, a second UV-resistant layer 21, an intermediate support layer 20, a moisture-absorbing layer 22, and an easy-peel heat-sealing layer 24. Preferably, the intermediate support layer 20 and the surface corona composite layer 23 are both made of copolymer polypropylene resin; the easy-peel heat-sealing layer 24 is made of X305 easy-peel resin.

[0035] The base film 3 is a transparent biaxially oriented nylon (BOPA) film, providing toughness and support. The outer barrier film layer 1 is bonded to the upper surface of the base film 3 via a first adhesive layer 4, and the inner heat-sealing film layer 2 is bonded to the lower surface via a second adhesive layer 5. Further, both the first adhesive layer 4 and the second adhesive layer 5 are polyurethane adhesives. Preferably, the polyurethane adhesive is YH3166A / YH3166B with a weight ratio of 20:3.5, a dry coating weight of 3.5 gsm, and a curing time of 50°C / 72 hours. The advantages are: the product film of this design has high strength, product stability, and is suitable for large-scale continuous production.

[0036] Furthermore, the outer barrier film layer 1 is 12 μm; the base film 3 is 15 μm; the inner heat-sealing film layer 2 is 70 μm; and the first adhesive layer 4 and the second adhesive layer 5 are both 3.5 μm. Preferably, the corona composite layer 23 is 10 μm, the second UV-resistant layer 21 is 15 μm, the intermediate support layer 20 is 15 μm, the moisture-absorbing layer 22 is 15 μm, and the inner heat-sealing layer 24 is 15 μm.

[0037] This type of UV-resistant, moisture-absorbing, high-barrier transparent lid film for tea packaging is applied to the top of open tea containers (suitable for use on the lids of small cans, bottles, and boxes, especially when used with K-cups), forming a transparent, sealed tea packaging. Its advantages are: First, all three layers of the lid film (outer barrier film layer 1, inner heat-sealing film layer 2, and base film 3) are transparent, thus the lid also has excellent transparency, allowing the tea inside to be clearly seen and easily observed by consumers, facilitating quick information acquisition and purchase. Second, the lid film has a first UV-resistant layer 21 and a second UV-resistant layer with transparent ink, giving the tea packaging excellent UV resistance, effectively preventing the tea from being damaged by light and ensuring the long-term quality and shelf life of the tea. Third, the base film 3 has a moisture-absorbing layer 22, achieving good moisture absorption performance, while the high-performance outer barrier film layer 11 prevents moisture and foreign matter from entering, ensuring good dryness of the tea packaging and guaranteeing long-term dryness without quality change.

[0038] Furthermore, such as Figure 1 As shown, the cover film has a roll structure. A dry laminating device processes the outer barrier film layer 1, the inner heat-sealing film layer 2, and the base film 3 into an intermediate film. A slitting machine cuts the intermediate film, and a winding device rolls the intermediate film into the final product roll. Its advantages are: this setup facilitates large-scale continuous production operations and has high production efficiency.

[0039] Further, the inner heat-sealing film layer 2 is formed by a five-layer co-extrusion casting device. The five-layer co-extrusion device thoroughly mixes the raw materials of each layer and adds them separately to the corresponding barrels of the extruder. The extruder is then heated in sections, pressurized and plasticized through a filter screen, and then uniformly mixed, heated, inflated, adjusted, cooled, slit, and wound through the blown film die head channel. Preferably, the second UV-resistant layer 21 comprises: 20-30 parts of copolymer polypropylene resin, 20-30 parts of metallocene-catalyzed polypropylene resin, 10-20 parts of polyolefin elastomer, and 10-20 parts of UV-resistant masterbatch; the UV-resistant masterbatch contains at least one UV-resistant agent. Preferably, the moisture-absorbing layer 22 comprises: 20-30 parts of copolymer polypropylene resin, 20-30 parts of metallocene-catalyzed polypropylene resin, 10-20 parts of polyolefin elastomer, and 10-20 parts of moisture-absorbing masterbatch. Its beneficial effects are: the inner heat-sealing film layer 2 can ensure good moisture absorption and UV resistance.

[0040] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. A transparent, UV-resistant, moisture-absorbing, high-barrier capping film for tea packaging, characterized in that, Includes: an outer barrier film layer (1), an inner heat-sealing film layer (2), and a base film (3); The outer barrier film layer (1) includes a base layer (10) of transparent PET material. The lower surface of the base layer (10) is vacuum-deposited with metal oxide to form a high barrier coating (11) of transparent film structure. The lower surface of the high barrier coating (11) is printed with composite transparent ink to form a first anti-ultraviolet layer (12) that blocks ultraviolet rays. The inner heat-sealing film layer (2) is a transparent RCPP film. The inner heat-sealing film layer (2) includes a corona composite layer (23), a second anti-ultraviolet layer (21), an intermediate support layer (20), a moisture-absorbing layer (22), and an easy-to-peel heat-sealing layer (24) distributed from the outside to the inside. The base film (3) is a transparent biaxially oriented nylon BOPA film. The upper surface of the base film (3) is bonded with an outer barrier film layer (1) through a first adhesive layer (4), and the lower surface is bonded with an inner heat-sealing film layer (2) through a second adhesive layer (5).

2. The cover film according to claim 1, characterized in that, The outer barrier film layer (1) is an ALOx-PET film, and the high-barrier coating (11) is a high-barrier alumina coating with an aluminum-plated thin film structure, whose oxygen permeability (OTR) is ≤0.5 cm⁻¹. 3 / (m 2 (×24h×0.1MPa), water vapor transmission rate WVTR≤0.5 g / (m²) 2 ×24h).

3. The cover film according to claim 2, characterized in that, The first UV-resistant layer (12) is formed by printing orange-yellow transparent ink or polyurethane ink on the lower surface of the base layer (10).

4. The cover film according to claim 3, characterized in that, The high-barrier coating (11) has a thickness of 30-50 nm, and the first UV-resistant layer (12) has a thickness of 1-2 μm.

5. The cover film according to claim 1, characterized in that, Both the first adhesive layer (4) and the second adhesive layer (5) are polyurethane adhesives.

6. The cover film according to claim 1, characterized in that, The cover film has a roll structure. The dry composite device processes the outer barrier film layer (1), the inner heat-sealing film layer (2) and the base film (3) into an intermediate film. The slitting machine cuts the intermediate film, and the winding device forms the final product roll film.

7. The cover film according to any one of claims 1 to 6, characterized in that, The outer barrier film layer (1) is 12 μm; the base film (3) is 15 μm; the inner heat-sealing film layer (2) is 70 μm; the first adhesive layer (4) and the second adhesive layer (5) are both 3.5 μm.

Images