Oxygen barrier composite pouch for cooked food products

Abstract

The utility model discloses an oxygen -resistant composite packaging bag for cooked food products, including packaging bag body and setting in the cooked food information label of packaging bag body front end outer wall center place downside, the cooked food information label is fixedly connected with packaging bag body through sticky gum, the inside of packaging bag body top opening is provided with encryption heat -seal membrane, and packaging bag body top cross section area is less than bottom cross section area, through increasing novel convenient bag opening device in packaging bag body front end outer wall, the built -in semicircular hard plastic bag opening blade of this device makes user not need to look for scissors, cutting tool etc. external tool, only needs to take out bag opening assembly from rectangular hidden bag, can directly operate, especially adapts family, outdoor, office etc. toolless scene, solves the embarrassing situation of wanting to eat but not being able to open, and the bag opening process of the device only needs four steps of pulling, taking, tying and scratching, has no complex operation logic, can be quickly mastered regardless of age and hand strength, and covers more extensive user groups.

Description

Technical Field

[0001] This utility model belongs to the technical field of food packaging, specifically relating to oxygen-barrier composite packaging bags for cooked food products. Background Technology

[0002] Cooked food products (such as braised dishes, braised meat, and ready-to-eat braised dishes) are rich in nutrients such as protein and fat. During storage and distribution, they are easily affected by external factors such as oxygen and water vapor, leading to problems such as oxidation and discoloration, rancidity, and microbial growth. This results in a shortened shelf life and decreased quality. To address this core issue, oxygen-barrier composite packaging bags have emerged. Through the scientific composite of multiple functional materials (such as PET, PVDC, EVOH, and PE), they construct a comprehensive protective system that is "oxygen-barrier, moisture-barrier, airtight, and temperature-resistant," effectively isolating external oxygen (oxygen permeability can be as low as <0.1cm). 3 / (m 2 ·24h·0.1MPa)) and water vapor, delaying the spoilage of cooked food, and can be adapted to diverse processing and storage scenarios such as high-temperature sterilization and low-temperature refrigeration, providing key support for the industrial production and long-distance circulation of cooked food, and has become the mainstream form of modern cooked food packaging;

[0003] However, existing oxygen-barrier composite packaging bags (especially multi-layer thick film structures) require high mechanical strength and toughness of the film to ensure oxygen barrier and sealing performance. Traditional opening methods (such as tearing by hand or biting) are extremely difficult, and ordinary consumers need to use external tools such as scissors or knives to open them. However, in situations where there are no tools available outside the home (such as outdoor picnics, office snacks, or meals while traveling), consumers face the dilemma of "wanting to eat but not being able to open it." At the same time, the elderly, children, and people with weak hand strength or mobility difficulties cannot operate scissors smoothly or tear forcefully, making it difficult for them to open the bags independently, thus limiting the product's user reach. Utility Model Content

[0004] The purpose of this utility model is to provide an oxygen-barrier composite packaging bag for cooked food products, in order to solve the problem of the multi-layer thick film oxygen-barrier composite packaging bags mentioned in the background art. Because it is necessary to ensure oxygen barrier sealing, the bag film has high mechanical strength and toughness, and it is difficult to open the bag by traditional methods such as tearing by hand or biting. Tools such as scissors are required. In outdoor or office settings where there are no tools, consumers face the dilemma of wanting to eat but not being able to open the bag.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an oxygen-barrier composite packaging bag for cooked food products, comprising a packaging bag body and a cooked food information label disposed on the lower side of the center of the outer wall at the front end of the packaging bag body. The cooked food information label is fixedly connected to the packaging bag body by adhesive. An encrypted heat-sealing film is disposed inside the top opening of the packaging bag body, and the cross-sectional area of ​​the top of the packaging bag body is smaller than the cross-sectional area of ​​the bottom. A convenient bag opening device is disposed on the upper side of the center of the outer wall at the front end of the packaging bag body.

[0006] Preferably, the convenient bag opening device includes a rectangular inner bag, a sealing adhesive strip, and a tear strip. The rectangular inner bag is glued and fixed to the outer wall of the front end of the packaging bag body. The top of the rectangular inner bag is open. The sealing adhesive strip is provided on the outer wall of the top of the front end of the rectangular inner bag. A tear strip is provided at the center of the top of the sealing adhesive strip.

[0007] Preferably, the outer wall of the rear end of the sealing strip is provided with adhesive, and the sealing strip can be directly adhered to the outer wall of the front end of the packaging bag body through the adhesive to seal the top opening of the rectangular inner bag. The tear strip can be pulled forward to directly tear open the sealing strip adhered to the outer wall of the front end of the packaging bag body.

[0008] Preferably, the convenient bag opening device further includes a semi-circular hard plastic bag opening blade and a strip-shaped hard plastic handle. The bottom end of the strip-shaped hard plastic handle is provided with a semi-circular hard plastic bag opening blade. The strip-shaped hard plastic handle and the bottom semi-circular hard plastic bag opening blade are placed vertically in the rectangular inner bag. The total length of the semi-circular hard plastic bag opening blade and the strip-shaped hard plastic handle is less than the vertical depth of the rectangular inner bag.

[0009] Preferably, the convenient bag opening device further includes serrated grooves, the right end of the semi-circular hard plastic bag opening blade has an arc-shaped outer wall with a sharpened edge, and multiple serrated grooves are equidistantly arranged at the arc-shaped edge of the semi-circular hard plastic bag opening blade. The bottom tip of the left end of the semi-circular hard plastic bag opening blade can puncture the packaging bag body by applying force to the packaging bag body.

[0010] Preferably, the packaging bag body includes a protective moisture-proof outer layer, an oxygen- and moisture-proof intermediate layer, a core oxygen-proof intermediate layer, and a heat-sealed inner layer. The heat-sealed inner layer is the inner layer of the packaging bag body and is in direct contact with cooked food. The core oxygen-proof intermediate layer is disposed outside the heat-sealed inner layer, and an oxygen- and moisture-proof intermediate layer is disposed outside the core oxygen-proof intermediate layer. The protective moisture-proof outer layer is disposed outside the oxygen- and moisture-proof intermediate layer.

[0011] Preferably, the protective moisture-barrier outer layer is made of PET material, the oxygen-barrier and moisture-barrier intermediate layer is made of PVDC material, and the core oxygen-barrier intermediate layer is made of EVOH material.

[0012] Preferably, the heat-sealing inner layer is made of PE material, and the encrypted heat-sealing film is made of retort-grade modified PE material.

[0013] Compared with the prior art, this utility model provides an oxygen-barrier composite packaging bag for cooked food products, which has the following beneficial effects:

[0014] This utility model adds a novel and convenient bag-opening device to the outer wall of the front end of the packaging bag. The device has a built-in semi-circular hard plastic bag-opening blade, so users do not need to find scissors, knives or other external tools. They can directly operate the bag by simply taking out the bag-opening component from the rectangular inner bag. It is especially suitable for tool-free scenarios such as home, outdoors, and office, solving the embarrassment of wanting to eat but not being able to open the bag. The bag-opening process of this device only requires four steps: tearing, taking out, tying and cutting (pulling the tearing piece to open the rectangular inner bag, taking out the strip-shaped hard plastic handle and bag-opening blade, tying the bag opening with the blade tip, and cutting along the edge of the bag opening with the serrated groove). There is no complicated operation logic. Regardless of age or hand strength, everyone can quickly master it, covering a wider range of users.

[0015] The device's semi-circular hard plastic bag-opening blade features an arc-shaped cutting edge and serrated groove design, allowing it to smoothly slice open the bag opening, avoiding bag deformation and spillage of cooked food grease or soup caused by traditional violent tearing. It also allows for precise control of the opening size. Made of food-grade hard plastic, the blade's sharpness is limited to cutting through composite bag film, and its rounded edges prevent deep cuts even if accidentally touched. The blade is vertically connected to a strip-shaped hard plastic handle, allowing users to apply force through the handle without direct contact with the blade, further reducing operational risks. The device's rectangular inner bag is secured with adhesive, attaching only to the front outer wall of the packaging bag without penetrating it. This prevents damage to the bag's multi-layered oxygen barrier structure, ensuring extremely low oxygen permeability before opening and preserving the shelf life of cooked food. Attached Figure Description

[0016] Figure 1 This is a front-view three-dimensional structural diagram of the oxygen-barrier composite packaging bag for cooked food products according to this utility model.

[0017] Figure 2 This is a schematic diagram of the three-dimensional structure of the packaging bag body layer array of this utility model.

[0018] Figure 3 This is a schematic diagram of the external three-dimensional structure of the convenient bag-opening device of this utility model.

[0019] Figure 4 This is a schematic diagram of the internal three-dimensional structure of the convenient bag-opening device of this utility model.

[0020] In the image: 1. Packaging bag body; 2. Cooked food information label; 3. Convenient bag opening device; 4. Encrypted heat-sealing film; 5. Protective moisture-proof outer layer; 6. Oxygen- and moisture-proof intermediate layer; 7. Core oxygen-proof intermediate layer; 8. Heat-sealed inner layer; 9. Rectangular inner bag; 10. Sealing adhesive strip; 11. Tear flap; 12. Semi-circular hard plastic bag opening blade; 13. Serrated groove; 14. Strip-shaped hard plastic handle. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] This utility model provides, for example Figure 1-4The oxygen-barrier composite packaging bag for cooked food products shown includes a bag body 1 and a cooked food information label 2 located on the lower side of the center of the outer wall at the front end of the bag body 1. The cooked food information label 2 is fixedly connected to the bag body 1 by adhesive. The advantage of this location for the cooked food information label 2 is that the information is displayed intuitively and is not easily worn. The principle is that the lower side of the center avoids the opening operation area at the top of the bag and the standing support area at the bottom. This makes it convenient for consumers to quickly view key information such as the name of the cooked food, production date, and shelf life when purchasing, and also avoids damage when opening the bag (e.g., by using a convenient opening device 3 to cut open the bag opening) or placing it on the ground. To prevent damage to the label during storage, food-grade environmentally friendly adhesive is used. Its advantages include strong adhesion and no residue. The principle is that the adhesive molecules form a strong adhesion to the outer surface of the PET layer, ensuring the label does not fall off during transportation and storage. Furthermore, the label can be easily peeled off during packaging bag recycling without affecting the recycling process. An encrypted heat-sealing film 4 is installed inside the top opening of the packaging bag body 1. This encrypted heat-sealing film 4 is made of retort-grade modified PE material. It forms a double-layer heat-sealing structure with the PE inner heat-sealing layer 8, enhancing the reliability of the bag opening seal. The principle is that the retort-grade modified PE... With adjustments (such as adding high-temperature resistant additives), the temperature tolerance is increased to 121-135℃. This allows for perfect fusion with the inner heat-sealing layer 8 (PE) during heat sealing (due to homogeneous materials and good molecular permeability, preventing delamination and leakage). It also maintains a stable shape during high-temperature sterilization, without softening or delamination, solving the problem of decreased sealing performance of ordinary PE heat-sealing layers after high-temperature sterilization. It is particularly suitable for cooked foods requiring high-temperature sterilization (such as sterilized braised duck and braised pig's trotters). Furthermore, the presence of the encrypted heat-sealing film 4 facilitates subsequent secondary sealing; if a user does not finish the cooked food at once, they can use the heat-sealing film 4 to reseal it. The packaging bag body 1 is designed to be narrower at the top and wider at the bottom. This design allows the bag to stand stably after being filled with cooked food (e.g., it is less likely to tip over when displayed on a shelf). It also facilitates the filling operation of automated production lines. The wider bottom design increases the space for the contents, while the narrower top design makes it easier to heat seal and open the bag, avoiding the increased sealing difficulty and misalignment problems caused by the wide opening design.

[0023] like Figure 1 and Figure 2As shown, the packaging bag body 1 includes a protective moisture-barrier outer layer 5, an oxygen-barrier and moisture-barrier intermediate layer 6, a core oxygen-barrier intermediate layer 7, and a heat-sealed inner layer 8. The heat-sealed inner layer 8 is the inner layer of the packaging bag body 1 and comes into direct contact with cooked food. The core oxygen-barrier intermediate layer 7 is located outside the heat-sealed inner layer 8, and the oxygen-barrier and moisture-barrier intermediate layer 6 is located outside the core oxygen-barrier intermediate layer 7. The protective moisture-barrier outer layer 5 is located outside the oxygen-barrier and moisture-barrier intermediate layer 6. The protective moisture-barrier outer layer 5 is made of PET material. The advantages of the PET material protective moisture-barrier outer layer 5 are: firstly, high mechanical strength and excellent abrasion and scratch resistance; secondly, the high rigidity and crystallinity of PET molecular chains, which can resist collisions and friction between packaging bags during transportation and shelf display, preventing damage to the outer layer. This results in several advantages: firstly, the inner structure is exposed; secondly, it has excellent moisture-blocking performance, further preventing the intrusion of external water vapor and forming a "double moisture-blocking protection" with the inner PVDC layer; and thirdly, it is suitable for printing, as the PET surface tension is moderate, allowing for clear display of cooked food brand information, nutritional information, and other content, enhancing product visual recognition. The oxygen and moisture barrier intermediate layer 6 is made of PVDC material. The advantage of the PVDC-made oxygen and moisture barrier intermediate layer 6 is that it combines both oxygen and moisture barrier functions. The principle is that the PVDC molecular structure is compact and has no polar groups, which can both block oxygen molecule penetration (assisting in enhancing the overall oxygen barrier effect and compensating for the slight decrease in oxygen barrier performance of EVOH in high humidity environments) and effectively block external water vapor (water vapor permeability < 1g / (m²)). 2 • 24h) This prevents cooked food from softening and molding due to moisture absorption, making it especially suitable for the rainy season in southern China or high-humidity storage environments. The core oxygen barrier layer 7 is made of EVOH material, which is currently the preferred transparent oxygen barrier material due to its extremely strong oxygen barrier performance (oxygen permeability <0.1cm). 3 / (m 2 The principle behind the EVOH heat-sealing system (24h·0.1MPa) is that the hydroxyl groups (-OH) in the EVOH molecule can form strong hydrogen bonds with oxygen molecules, hindering oxygen penetration and fundamentally delaying the oxidation, discoloration, and rancidity of cooked food caused by oxygen intrusion. This ensures a shelf life of 6-12 months at room temperature for cooked food. The inner heat-sealing layer 8 is made of PE material. The advantages of the PE material inner heat-sealing layer 8 are high food contact safety, meeting the GB4806 food contact standard, odorless, and without the release of harmful substances, thus avoiding contamination when in contact with cooked food. At the same time, PE material has excellent heat-sealing performance, and can quickly melt and seal at a temperature of 120-160℃. The principle is that PE molecules are in a viscous flow state at high temperatures, and the interlayer fusion is achieved through heat-sealing pressure, ensuring that the bag is sealed and does not leak, thus building the first protective barrier for cooked food.

[0024] like Figure 1 , Figure 3 and Figure 4As shown, a convenient opening device 3 is provided on the upper side of the center of the front outer wall of the packaging bag body 1. The convenient opening device 3 includes a rectangular inner bag 9, a sealing adhesive strip 10, and a tear piece 11. The rectangular inner bag 9 is fixed to the front outer wall of the packaging bag body 1 by adhesive. The top is designed with an opening. A sealing adhesive strip 10 is installed on the top outer wall of the front of the rectangular inner bag 9. A tear piece 11 is integrated at the center of the top of the sealing adhesive strip 10. The outer wall of the rear end of the sealing adhesive strip 10 is coated with adhesive, which can be directly pasted to the front outer wall of the packaging bag body 1 to seal the top opening of the rectangular inner bag 9. The advantage of the rectangular inner bag 9 is that it provides a safe storage space. The principle is to completely hide the bag opening tools (blade, handle) inside, avoiding the tools from being exposed to dust, oil, or damage due to collision. The blunt tip ensures the cleanliness and sharpness of the opening tool. The sealing strip 10 has the advantage of being resealable. The principle is that the adhesive uses a low-residue, high-adhesion formula, which can not only firmly adhere to the outer layer of PET (strong adhesion, not easy to fall off), but also can be re-adhere after being torn. If the user does not open the bag temporarily, the tool can be put back into the inner bag and resealed, keeping the tool clean. At the same time, the adhesive seal does not require an additional sealing structure, simplifying the design and reducing costs. The tear strip 11 has the advantage of being easy to open the inner bag. The principle is that the tear strip 11 is made of thickened hard plastic material, with concentrated force points. The user only needs to pull forward gently to quickly tear open the sealing strip 10 without using fingernails or tools to pry it open. It is especially suitable for users with short nails or weak hand strength (such as the elderly and children), lowering the threshold for opening.

[0025] like Figure 1 , Figure 3 and Figure 4As shown, the bottom end of the strip-shaped hard plastic handle 14 is integrally connected to the semi-circular hard plastic bag-opening blade 12. After vertical assembly, the entire assembly is placed inside the rectangular inner bag 9. The total length of the semi-circular hard plastic bag-opening blade 12 and the strip-shaped hard plastic handle 14 is less than the vertical depth of the rectangular inner bag 9, ensuring that the inner bag can completely accommodate the components without any exposure. The advantage of the strip-shaped hard plastic handle 14 is that it is easy to grip and apply force. The principle is that the handle adopts an ergonomic cylindrical design with a diameter suitable for the fingers of adults and children. Users can stably control the direction of the blade through the handle, avoiding direct contact with the blade edge and preventing cuts, thus improving operational safety. At the same time, the structure of the handle and the blade being vertically connected can efficiently transfer the force applied by the hand to the blade, reducing the amount of force required to open the bag. With its powerful blade, the semi-circular hard plastic bag opener blade 12 is easy for the elderly and children to operate. Its advantages include high efficiency and safety in opening bags. The blade is made of food-grade hard plastic material (non-metallic material), and the sharpness of the blade edge is precisely controlled within the range of "being able to cut through the composite bag film without cutting the hand". The edges are rounded, so even if accidentally touched, it will not cause deep injury. The semi-circular structure design can adapt to the "narrow" shape of the top of the packaging bag and smoothly cut along the arc edge of the bag opening, avoiding the problem of traditional straight blades easily deviating from the bag opening and tearing the bag body. On the right arc outer wall (blade edge area) of the semi-circular hard plastic bag opener blade 12, there are multiple serrated grooves 13 evenly arranged, and the right arc outer wall of the blade is sharpened. The bottom point of the left end is the piercing end.

[0026] like Figure 1 , Figure 3 and Figure 4 As shown, the serrated groove 13 has the advantage of enhancing the cutting ability and avoiding slippage. The principle is that the serrated structure can increase the friction between the blade and the bag film. Especially for thick bags with multiple layers of composite material (such as PET+PVDC+EVOH+PE), it can be easily cut open through the "biting" action of the serrations, solving the problem of slippage and repeated force required when cutting bags with ordinary smooth blades, thus improving the efficiency of opening bags. At the same time, the equidistant design ensures that the cutting path is uniform, avoiding irregular tears at the bag opening that could cause cooked food and soup to splash out. The advantage of the semi-circular hard plastic bag opening blade 12 at the bottom left end is that it can quickly pierce the bag opening and open it conveniently. The principle is that the tip adopts a concentrated force design. Users only need to align the tip with the top opening of the packaging bag and apply light pressure to pierce the bag film using the physical principle of "high pressure at the tip" (without tearing it with great force), providing an initial breakthrough for subsequent cutting of the bag opening. It is especially suitable for vacuum-sealed tight bags, solving the problem of "not being able to find a breakthrough" in traditional bag opening.

[0027] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An oxygen-barrier composite packaging bag for cooked food products, comprising a packaging bag body (1) and a cooked food information label (2) disposed on the lower side of the center of the outer wall at the front end of the packaging bag body (1), wherein the cooked food information label (2) is fixedly connected to the packaging bag body (1) by adhesive, wherein an encrypted heat-sealing film (4) is disposed inside the top opening of the packaging bag body (1), and the cross-sectional area of ​​the top end of the packaging bag body (1) is smaller than the cross-sectional area of ​​the bottom end, characterized in that: The packaging bag body (1) has a convenient bag opening device (3) on the upper side of the center of the front outer wall; The convenient bag opening device (3) includes a rectangular inner bag (9), a sealing adhesive strip (10), and a tear piece (11). The rectangular inner bag (9) is attached and fixed to the outer wall of the front end of the packaging bag body (1). The top of the rectangular inner bag (9) is set with an opening. The outer wall of the top of the front end of the rectangular inner bag (9) is provided with a sealing adhesive strip (10). A tear piece (11) is provided at the center of the top of the sealing adhesive strip (10).

2. The oxygen-barrier composite packaging bag for cooked food products according to claim 1, characterized in that: The sealing strip (10) has adhesive on its outer rear end, and the sealing strip (10) can be directly attached to the outer front end of the packaging bag body (1) to seal the top opening of the rectangular inner bag (9). The tear strip (11) can be pulled forward to directly tear the sealing strip (10) attached to the outer front end of the packaging bag body (1).

3. The oxygen-barrier composite packaging bag for cooked food products according to claim 2, characterized in that: The convenient bag opening device (3) also includes a semi-circular hard plastic bag opening blade (12) and a strip-shaped hard plastic handle (14). The bottom end of the strip-shaped hard plastic handle (14) is provided with a semi-circular hard plastic bag opening blade (12). The strip-shaped hard plastic handle (14) and the bottom semi-circular hard plastic bag opening blade (12) are placed vertically in the rectangular inner bag (9). The total length of the semi-circular hard plastic bag opening blade (12) and the strip-shaped hard plastic handle (14) is less than the vertical depth of the rectangular inner bag (9).

4. The oxygen-barrier composite packaging bag for cooked food products according to claim 3, characterized in that: The convenient bag opening device (3) also includes a serrated groove (13). The right end of the semi-circular hard plastic bag opening blade (12) has an arc-shaped outer wall with a sharpened edge. Multiple serrated grooves (13) are equidistantly arranged at the arc-shaped edge of the semi-circular hard plastic bag opening blade (12). The bottom tip of the left end of the semi-circular hard plastic bag opening blade (12) can puncture the packaging bag body (1) by applying force to the packaging bag body (1).

5. The oxygen-barrier composite packaging bag for cooked food products according to claim 1, characterized in that: The packaging bag body (1) includes a protective moisture-proof outer layer (5), an oxygen-proof and moisture-proof intermediate layer (6), a core oxygen-proof intermediate layer (7), and a heat-sealing inner layer (8). The heat-sealing inner layer (8) is the inner layer of the packaging bag body (1). The heat-sealing inner layer (8) is in direct contact with cooked food. The core oxygen-proof intermediate layer (7) is provided outside the heat-sealing inner layer (8). The oxygen-proof and moisture-proof intermediate layer (6) is provided outside the core oxygen-proof intermediate layer (7). The protective moisture-proof outer layer (5) is provided outside the oxygen-proof and moisture-proof intermediate layer (6).

6. The oxygen-barrier composite packaging bag for cooked food products according to claim 5, characterized in that: The protective moisture barrier outer layer (5) is made of PET material, the oxygen and moisture barrier intermediate layer (6) is made of PVDC material, and the core oxygen barrier intermediate layer (7) is made of EVOH material.

7. The oxygen-barrier composite packaging bag for cooked food products according to claim 6, characterized in that: The heat-sealing inner layer (8) is made of PE material, and the encrypted heat-sealing film (4) is made of retort-grade modified PE material.

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