Acid-resistant high-barrier seal sheet

Abstract

The utility model relates to a sealing piece technical field especially acid -resistant high barrier sealing piece, including bottom layer, acid -resistant high barrier layer, moistureproof layer and surface layer, the top surface of bottom layer is bonded with acid -resistant high barrier layer, the top surface of acid -resistant high barrier layer is bonded with moistureproof layer, the top surface of moistureproof layer is bonded with surface layer, acid -resistant high barrier layer sets up EVOH layer, EVOH-PE layer and PET layer from below to above in proper order, the top surface of EVOH layer is bonded with EVOH-PE layer, the top surface of EVOH-PE layer is bonded with PET layer, after the combination of EVOH layer, EVOH-PE layer and PET layer, have very strong acid -resistant effect, and the liquid of PH equal to 2 cannot penetrate, and then greatly enhanced the acid -resistant performance of sealing piece, make the use range of sealing piece increase, improve its use effect, furthermore, EVOH layer and EVOH-PE layer still have high barrier property, can effectively block oxygen, carbon dioxide and water vapor and other gases, can effectively satisfy some requirements shelf -life longer product, and then improve the use quality of sealing piece as a whole.

Description

Technical Field

[0001] This utility model relates to the field of sealing sheet technology, and in particular to an acid-resistant, high-barrier sealing sheet. Background Technology

[0002] Sealing sheets (sealing films) are packaging sealing materials made from multiple layers of different materials through a composite process, mainly used for sealing and protecting the openings of various containers. Their core structure typically includes a substrate layer, a barrier layer, and a heat-sealing layer, such as a composite material made of PET (polyester film), aluminum foil (AL), and PE (polyethylene). This material achieves non-contact heat sealing using equipment such as electromagnetic induction sealing machines, and possesses functions such as moisture resistance, anti-counterfeiting, and leak prevention. It is widely used in the packaging of plastic or glass containers in the food, pharmaceutical, cosmetic, and chemical industries.

[0003] However, existing sealing sheets (sealing films) mainly rely on PET for acid resistance, which is generally limited. Liquids with a pH of 2 can penetrate them, thus narrowing their application range and resulting in poor performance. Furthermore, the barrier properties of PET and PE alone are insufficient. Although PET and PE have some barrier properties, they cannot meet the requirements for products with long shelf lives (their effectiveness in preventing water vapor and oxygen penetration is generally limited, and they easily become permeable to water and oxygen over time). Based on this, we propose a sealing sheet with high acid resistance and barrier properties. Utility Model Content

[0004] In view of the shortcomings of the prior art, this utility model provides an acid-resistant high-barrier sealing sheet, which, after improvement, can effectively solve the problems mentioned in the background art.

[0005] The technical solution of this utility model is as follows:

[0006] An acid-resistant high-barrier sealing sheet includes a bottom layer, an acid-resistant high-barrier layer, a moisture-proof layer, and a top layer;

[0007] An acid-resistant high-barrier layer is bonded to the top surface of the bottom layer, a moisture-proof layer is bonded to the top surface of the acid-resistant high-barrier layer, and a surface layer is bonded to the top surface of the moisture-proof layer.

[0008] The acid-resistant high barrier layer consists of an EVOH layer, an EVOH-PE layer, and a PET layer arranged sequentially from bottom to top. The top surface of the EVOH layer is bonded to the EVOH-PE layer, and the top surface of the EVOH-PE layer is bonded to the PET layer.

[0009] Furthermore, the bottom layer is a PE layer, the top surface of which is bonded and fixed to the EVOH layer, and the thickness of the PE layer is 42 micrometers.

[0010] Furthermore, the thickness of the EVOH layer is 30 micrometers, the thickness of the EVOH-PE layer is 38 micrometers, and the thickness of the PET layer is 16 micrometers.

[0011] Furthermore, the moisture-proof layer is an aluminum foil layer with a thickness of 12 micrometers, and the top surface of the PET layer is bonded and fixed to the aluminum foil layer.

[0012] Furthermore, the surface layer is a white cardboard layer, and the thickness of the white cardboard layer is 511 micrometers.

[0013] The beneficial effects of this utility model are as follows:

[0014] Compared with existing technologies, this utility model features an acid-resistant high-barrier layer, which consists of an EVOH layer, an EVOH-PE layer, and a PET layer arranged sequentially from bottom to top. The combination of these layers provides extremely strong acid resistance, preventing liquids with a pH of 2 from penetrating, thus significantly enhancing the acid resistance of the sealing sheet. This expands the application range and improves its effectiveness. Furthermore, the EVOH and EVOH-PE layers also possess high barrier properties, effectively blocking gases such as oxygen, carbon dioxide, and water vapor, meeting the needs of products requiring long shelf lives. This overall improvement enhances the quality of the sealing sheet and makes it highly practical. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the acid-resistant high-barrier layer of this utility model.

[0017] In the diagram, 1 is the bottom layer; 2 is the acid-resistant high-barrier layer; 3 is the moisture-proof layer; 4 is the top layer; 5 is the EVOH layer; 6 is the EVOH-PE layer; and 7 is the PET layer. Detailed Implementation

[0018] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings:

[0019] like Figure 1-2 As shown,

[0020] A high-barrier, acid-resistant sealing sheet includes a bottom layer 1, an acid-resistant high-barrier layer 2, a moisture-proof layer 3, and a top layer 4. The top surface of the bottom layer 1 is bonded with the acid-resistant high-barrier layer 2, the top surface of the acid-resistant high-barrier layer 2 is bonded with the moisture-proof layer 3, and the top surface of the moisture-proof layer 3 is bonded with the top layer 4. The acid-resistant high-barrier layer 2 has, from bottom to top, an EVOH layer 5, an EVOH-PE layer 6, and a PET layer 7. The top surface of the EVOH layer 5 is bonded with the EVOH-PE layer 6, and the top surface of the EVOH-PE layer 6 is bonded with the PET layer 7. In this application, EVOH (ethylene-vinyl alcohol copolymer) is a high-barrier material mainly composed of ethylene and vinyl alcohol copolymerized together. It possesses excellent gas, moisture, and oxygen barrier properties, effectively extending the shelf life of food and other products. Furthermore, EVOH exhibits good anti-aging, weather resistance, and antistatic properties, and boasts excellent environmental performance, meeting food and pharmaceutical safety standards. EVOH-PE combines the high barrier properties of EVOH with the good processability of PE. EVOH's excellent barrier properties effectively block gases such as oxygen and carbon dioxide. Due to its superior barrier properties, EVOH-PE is commonly used in food packaging, pharmaceutical packaging, and cosmetic packaging, extending product shelf life and maintaining freshness. In summary, EVOH layer 5 and EVOH-PE layer 6 offer high barrier properties, effectively blocking gases such as oxygen, carbon dioxide, and water vapor, effectively meeting the needs of products requiring longer shelf lives, thus improving the overall quality of the sealing film. Moreover, the combination of EVOH layer 5, EVOH-PE layer 6, and PET layer 7 provides extremely strong acid resistance; liquids with a pH of 2 cannot penetrate, significantly enhancing the sealing film's acid resistance and expanding its application range and effectiveness.

[0021] In a preferred embodiment, the bottom layer 1 is a PE layer, the top surface of which is bonded and fixed to the EVOH layer 5, and the thickness of the PE layer is 42 micrometers. It can be understood that the main purpose of using a PE layer as the bottom layer 1 is to use the same material as the bottle opening. When the bottle opening is made of PE, the bottom layer 1 of this sealing sheet does not require adhesive bonding; it only needs to be heat-fused and bonded to the bottle opening under hot air conditions.

[0022] In a preferred embodiment, the thickness of the EVOH layer 5 is 30 micrometers, the thickness of the EVOH-PE layer 6 is 38 micrometers, and the thickness of the PET layer 7 is 16 micrometers.

[0023] In a preferred embodiment, the moisture-proof layer 3 is an aluminum foil layer with a thickness of 12 micrometers, and the top surface of the PET layer 7 is bonded and fixed to the aluminum foil layer. It is understood that the PET layer 7 not only has good acid resistance but also good tensile strength, ensuring that it is not easily stretched or deformed when printed with patterns during production, and also ensuring the integrity of the aluminum foil layer.

[0024] In a preferred embodiment, the surface layer 4 is a white cardboard layer with a thickness of 511 micrometers. It is understood that the white cardboard layer provides support (one condition for good support is a thickness of 511 micrometers). Without the white cardboard layer, the bottom layer 1, the acid-resistant high-barrier layer 2, and the moisture-proof layer 3 would be wrinkled and uneven during sealing, leading to poor sealing and air leakage. Furthermore, the white cardboard layer is bonded to the aluminum foil layer and can be separated after passing through the sealing machine without affecting its use.

[0025] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. An acid-resistant high-barrier sealing sheet, comprising a bottom layer, an acid-resistant high-barrier layer, a moisture-proof layer, and a top layer; The top surface of the bottom layer is bonded with an acid-resistant high-barrier layer, the top surface of the acid-resistant high-barrier layer is bonded with a moisture-proof layer, and the top surface of the moisture-proof layer is bonded with a top layer; characterized in that: The acid-resistant high barrier layer consists of an EVOH layer, an EVOH-PE layer, and a PET layer arranged sequentially from bottom to top. The top surface of the EVOH layer is bonded to the EVOH-PE layer, and the top surface of the EVOH-PE layer is bonded to the PET layer.

2. The acid-resistant high-barrier sealing sheet according to claim 1, characterized in that: The bottom layer is a PE layer, and the top surface of the PE layer is bonded and fixed to the EVOH layer. The thickness of the PE layer is 42 micrometers.

3. The acid-resistant high-barrier sealing sheet according to claim 2, characterized in that: The thickness of the EVOH layer is 30 micrometers, the thickness of the EVOH-PE layer is 38 micrometers, and the thickness of the PET layer is 16 micrometers.

4. The acid-resistant high-barrier sealing sheet according to claim 3, characterized in that: The moisture-proof layer is an aluminum foil layer with a thickness of 12 micrometers, and the top surface of the PET layer is bonded and fixed to the aluminum foil layer.

5. The acid-resistant high-barrier sealing sheet according to claim 4, characterized in that: The surface layer is a white cardboard layer with a thickness of 511 micrometers.

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