High-toughness puncture-proof fresh-keeping film bag for vegetables and fruits

Abstract

The utility model relates to the technical field of vegetable and fruit packaging, and particularly discloses a high-toughness puncture-proof fresh-keeping film bag for vegetables and fruits, which comprises a puncture-proof outer layer, the puncture-proof outer layer, a protective middle layer and a buffer inner layer are sequentially sleeved from outside to inside to form a film bag main body, and the puncture-proof outer layer, the protective middle layer and the buffer inner layer are closed and formed by hot pressing to form the fresh-keeping film bag main body for vegetables and fruits. According to the high-toughness puncture-proof fresh-keeping film bag for the vegetables and the fruits, the hemispherical buffer balls arranged on the surface of the buffer inner layer at equal intervals are integrally formed with the hydrophilic polymer inner base layer, and the hemispherical buffer balls and the second breathable micropores are distributed in a staggered mode, so that the vegetables and the fruits can be prevented from being in direct and tight contact with the film bag; the semispherical buffer balls effectively buffer external force through deformation, the concentrated pressure of sharp parts of vegetables and fruits on the film bag is dispersed into dispersion force in multiple directions, the local pressure intensity is reduced, the film bag is further protected from being punctured, and meanwhile damage to the vegetables and the fruits caused by extrusion is reduced.

Description

Technical Field

[0001] This utility model relates to the field of fruit and vegetable packaging technology, specifically a high-toughness, puncture-resistant fruit and vegetable freshness-locking film bag. Background Technology

[0002] Fruits and vegetables are indispensable foods in people's daily lives. They are rich in nutrients such as vitamins, minerals, and dietary fiber. However, after being picked, fruits and vegetables are still living organisms and will continue to carry out physiological activities such as respiration and transpiration, which will cause them to gradually lose water, nutrients, and quality, and even rot and spoil. Therefore, effective preservation measures are needed to extend the shelf life of fruits and vegetables.

[0003] Traditional food preservation bags have a single-layer structure that is easily punctured by the sharp parts of fruits and vegetables, resulting in poor actual performance. Once the bag is damaged, external air, moisture and microorganisms can invade, accelerating the spoilage and decay of fruits and vegetables. Utility Model Content

[0004] The purpose of this invention is to provide a high-toughness, puncture-resistant fruit and vegetable preservation film bag to solve the problem mentioned in the background art that the single-layer structure of traditional preservation film bags is easily punctured by the sharp parts of fruits and vegetables, resulting in poor actual use effect of the fruit and vegetable preservation film bag. Moreover, once the film bag is damaged, external air, moisture and microorganisms invade, accelerating the deterioration and rot of fruits and vegetables.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a high-toughness puncture-resistant fruit and vegetable fresh-locking film bag, comprising a puncture-resistant outer layer, a protective middle layer and a buffer inner layer sequentially arranged from the outside to the inside to form the main body of the film bag, wherein the puncture-resistant outer layer, the protective middle layer and the buffer inner layer are formed by hot-pressing and sealing to constitute the main body of the fruit and vegetable fresh-locking film bag;

[0006] The puncture-resistant outer layer is composed of a modified high-density polyethylene base layer and breathable micropores, and the modified high-density polyethylene base layer is uniformly provided with breathable micropores. The protective middle layer is composed of a composite sheet base layer, a natural rubber latex layer and an organosilicon pressure-sensitive adhesive layer bonded together, and the natural rubber latex layer is in contact with the modified high-density polyethylene base layer.

[0007] The inner buffer layer is composed of a hydrophilic polymer outer base layer, a hydrophilic polymer inner base layer, breathable micropores, and a hemispherical buffer ball. The inner wall of the inner buffer layer is the hydrophilic polymer inner base layer. The upper end of the opening of the puncture-proof outer layer is hot-pressed with a connecting strip, and a zipper sealing strip is connected inside the connecting strip. The surface of the zipper sealing strip is provided with anti-slip texture, and a zipper head is slidably connected inside the zipper sealing strip.

[0008] By adopting the above technical solution, the outer layer, the middle layer, and the inner layer are sequentially laminated and heat-pressed to form a protective structure. Combined with the special materials and structural design of each layer, the dual functions of high toughness and puncture resistance and efficient preservation are achieved.

[0009] Preferably, the puncture-resistant outer layer, the protective middle layer, and the buffer inner layer are nested together, and the openings of the puncture-resistant outer layer, the protective middle layer, and the buffer inner layer are bonded together by heat pressing.

[0010] The above technical solution features a nested arrangement of the puncture-resistant outer layer, protective middle layer, and buffer inner layer, with the openings heat-pressed together. This makes the membrane bag structure compact and robust, effectively preventing separation of the layers, enhancing overall stability, and further improving puncture resistance.

[0011] Preferably, the silicone pressure-sensitive adhesive layer abuts against the hydrophilic polymer outer base layer, and the silicone pressure-sensitive adhesive layer and the natural rubber latex layer are coated on both sides of the composite sheet base layer.

[0012] By adopting the above technical solutions, the structural strength and flexibility of the protective middle layer are enhanced, the overall sealing performance of the film bag is improved, and the impact of external environmental factors on fruits and vegetables is effectively blocked.

[0013] Preferably, the hydrophilic polymer outer base layer and the hydrophilic polymer inner base layer are stacked together to form the substrate of the buffer inner layer.

[0014] Using the above technical solution, a hydrophilic polymer outer base layer and a hydrophilic polymer inner base layer are stacked to form a buffer inner layer substrate, which utilizes the properties of hydrophilic polymers to efficiently absorb and release water vapor.

[0015] Preferably, the hydrophilic polymer inner base layer is uniformly provided with breathable micropores, and hemispherical buffer balls are equidistantly arranged on the surface of the hydrophilic polymer inner base layer.

[0016] Using the above technical solution, the hemispherical buffer ball avoids direct contact between fruits and vegetables and the film bag, buffers external forces during storage and transportation, disperses pressure on sharp parts of fruits and vegetables, reduces the risk of the film bag being punctured, and reduces damage to fruits and vegetables.

[0017] Preferably, the breathable micropores and the hemispherical buffer ball are staggered, and the hemispherical buffer ball is integrated with the hydrophilic polymer inner base layer.

[0018] By adopting the above technical solution, the air-permeable micropores and the hemispherical buffer ball are staggered and integrally formed, which maximizes the buffering and dispersing effect of the hemispherical buffer ball while ensuring the smooth flow of gas exchange channels.

[0019] Preferably, the second breathable micropore is aligned with the first breathable micropore.

[0020] By adopting the above technical solution, the aligned arrangement of the breathable micropores meets the breathing needs of fruits and vegetables and slows down their metabolism.

[0021] Compared with the prior art, the beneficial effects of this utility model are: This high-toughness, puncture-resistant fruit and vegetable preservation film bag:

[0022] 1. This fruit and vegetable freshness-locking film bag features a puncture-resistant outer layer, a protective middle layer, and a cushioning inner layer. The opening is connected by a heat-pressed strip, which, along with a zippered sealing strip and a zipper head, forms a convenient sealing structure. This makes it easy for users to open and close the film bag. The anti-slip texture on the surface of the zippered sealing strip makes opening and closing easier and less strenuous, and the sealing effect is reliable. It can be reused multiple times. Compared with traditional film bag sealing methods, it is more convenient to use and can better maintain the airtightness of the film bag, ensuring the freshness preservation effect.

[0023] 2. The composite sheet base layer in the further protective middle layer is coated with natural rubber latex layers and silicone pressure-sensitive adhesive layers on both sides, which not only helps to enhance the overall strength of the film bag, but also provides good sealing performance. Among them, the silicone pressure-sensitive adhesive layer is tightly bonded to the hydrophilic polymer outer base layer, and the natural rubber latex layer is bonded to the modified high-density polyethylene base layer. The multi-layer stacking effectively blocks the intrusion of external air, moisture and microorganisms. At the same time, the air-permeable micropores one and two are aligned and evenly distributed, which facilitates gas exchange between the inside and outside of the film bag, delays the respiration of fruits and vegetables, and the hydrophilic polymer outer base layer and hydrophilic polymer inner base layer of the buffer layer can absorb excess moisture released by fruits and vegetables and slowly release it when the humidity is low, maintaining the humidity inside the film bag. In conjunction with the natural antibacterial agent added to the inner layer, it inhibits the growth of microorganisms.

[0024] 3. The hemispherical buffer balls, equidistantly arranged on the inner surface of the buffer layer, are integrally formed with the hydrophilic polymer inner base layer and are staggered with the breathable micropores. This avoids direct and close contact between fruits and vegetables and the film bag. During storage and transportation, when fruits and vegetables are squeezed or collided, the hemispherical buffer balls effectively buffer the external force through deformation, dispersing the concentrated pressure of the sharp parts of the fruits and vegetables on the film bag into dispersed forces in multiple directions, reducing local pressure, further protecting the film bag from puncture, and reducing damage to fruits and vegetables caused by squeezing. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall external three-dimensional structure of this utility model;

[0026] Figure 2 This is a schematic diagram of the overall internal side section of the present invention.

[0027] Figure 3 This is a schematic diagram of the overall internal three-dimensional structure of this utility model;

[0028] Figure 4 This is a detailed structural diagram of the stab-resistant outer layer and the protective middle layer of this utility model;

[0029] Figure 5 This is a detailed structural diagram showing the puncture-resistant outer layer, protective middle layer, and buffer inner layer of this utility model.

[0030] Figure 6 This is a detailed structural diagram of the inner buffer layer of this utility model.

[0031] In the diagram: 1. Puncture-resistant outer layer; 101. Modified high-density polyethylene base layer; 102. Breathable micropores one; 2. Protective middle layer; 201. Composite sheet base layer; 202. Natural rubber latex layer; 203. Organosilicon pressure-sensitive adhesive layer; 3. Buffer inner layer; 301. Hydrophilic polymer outer base layer; 302. Hydrophilic polymer inner base layer; 303. Breathable micropores two; 304. Hemispherical buffer ball; 4. Connecting strap; 5. Chain lock strip; 6. Chain head. Detailed Implementation

[0032] 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.

[0033] Please see Figures 1-6 This utility model provides a technical solution: a high-toughness puncture-resistant fruit and vegetable fresh-locking film bag, comprising a puncture-resistant outer layer 1, a modified high-density polyethylene base layer 101, a breathable micropore one 102, a protective middle layer 2, a composite sheet base layer 201, a natural rubber latex layer 202, an organosilicon pressure-sensitive adhesive layer 203, a buffer inner layer 3, a hydrophilic polymer outer base layer 301, a hydrophilic polymer inner base layer 302, a breathable micropore two 303, a hemispherical buffer ball 304, a connecting strap 4, a zipper sealing strip 5, and a zipper head 6;

[0034] Among them, the puncture-proof outer layer 1, together with the protective middle layer 2 and the buffer inner layer 3, are sequentially fitted from the outside to the inside to form the main body of the film bag. The puncture-proof outer layer 1, the protective middle layer 2 and the buffer inner layer 3 are formed by hot pressing and closing to form the main body of the fruit and vegetable fresh-locking film bag.

[0035] The stab-resistant outer layer 1 is composed of a modified high-density polyethylene base layer 101 and breathable micropores 102, and the breathable micropores 102 are uniformly opened in the modified high-density polyethylene base layer 101. The protective middle layer 2 is composed of a composite sheet base layer 201, a natural rubber latex layer 202 and an organosilicon pressure-sensitive adhesive layer 203 bonded together. The natural rubber latex layer 202 abuts against the modified high-density polyethylene base layer 101, and the organosilicon pressure-sensitive adhesive layer 203 abuts against the hydrophilic polymer outer base layer 301. The organosilicon pressure-sensitive adhesive layer 203 and the natural rubber latex layer 202 are coated on both sides of the composite sheet base layer 201.

[0036] Referring to the attached diagrams in the instruction manual Figures 1-6 As shown, the modified high-density polyethylene base layer 101 of the stab-resistant outer layer 1 uses high-density polyethylene as the base material and is produced by a screw extruder. The surface of the modified high-density polyethylene base layer 101 is perforated by laser drilling to produce breathable micropores 102, ensuring that the micropore diameter is controlled within 0.05-0.1mm.

[0037] The composite sheet base layer 201 is made of polyethylene terephthalate film. A coating process is used to coat the surface of the film with a natural rubber latex layer 202 and an organosilicon pressure-sensitive adhesive layer 203. The natural rubber latex layer 202 is made of natural rubber latex with a concentration of 40%, and the organosilicon pressure-sensitive adhesive layer 203 is made of food-grade organosilicon pressure-sensitive adhesive.

[0038] Both the hydrophilic polymer outer base layer 301 and the hydrophilic polymer inner base layer 302 are made of polyvinyl alcohol. 5% chitosan is added during production to enhance its antibacterial properties. The hemispherical buffer ball 304 and the hydrophilic polymer inner base layer 302 are integrally injection molded using the same PVA-chitosan material. The hemispherical buffer ball 304 has a diameter of 1.5 mm, a height of 1 mm, and a spacing of 2.5 mm between adjacent buffer balls. The pore diameter of the second breathable micropore 303 is aligned with the first breathable micropore 102 and hot-melt opened.

[0039] After the above preparation, the stab-proof outer layer 1, the protective middle layer 2 and the buffer inner layer 3 are made. Then, a multi-layer co-extrusion composite process is adopted, and the stab-proof outer layer 1, the protective middle layer 2 and the buffer inner layer 3 are co-extruded and composited in sequence through an extruder. Then, it is ensured that each layer is tightly bonded. After the composite film is cooled and shaped, it is cut and hot-pressed by a bag making machine to form a film bag.

[0040] The connecting strap 4 is made of the same modified high-density polyethylene material as the stab-proof outer layer. The zipper locking strip 5 and zipper head 6 are made of food-grade polypropylene (PP). The surface of the zipper locking strip 5 is formed with an anti-slip texture through injection molding. During assembly, the connecting strap 4 is hot-pressed onto the upper end of the opening of the stab-proof outer layer 1, and then the zipper locking strip 5 and zipper head 6 are installed. Figures 1-3 As shown, the overall production is complete;

[0041] The stab-resistant outer layer 1, the protective middle layer 2, and the buffer inner layer 3 are nested together, and the openings of the stab-resistant outer layer 1, the protective middle layer 2, and the buffer inner layer 3 are bonded together by heat pressing. The buffer inner layer 3 is composed of a hydrophilic polymer outer base layer 301, a hydrophilic polymer inner base layer 302, a breathable microporous layer 303, and a hemispherical buffer ball 304. The inner wall of the buffer inner layer 3 is the hydrophilic polymer inner base layer 302. The hydrophilic polymer outer base layer 301 and the hydrophilic polymer inner base layer 302 are stacked together to form the substrate of the buffer inner layer 3. The hydrophilic polymer inner base layer 302 has a uniform structure. The outer layer 1 has a second ventilation micropore 303, and hemispherical buffer balls 304 are equidistantly arranged on the surface of the hydrophilic polymer inner base layer 302. The second ventilation micropore 303 and the hemispherical buffer balls 304 are staggered, and the hemispherical buffer balls 304 are integrated with the hydrophilic polymer inner base layer 302. The second ventilation micropore 303 is aligned with the first ventilation micropore 102. A connecting strip 4 is hot-pressed at the upper end of the opening of the puncture-proof outer layer 1, and a zipper sealing strip 5 is connected inside the connecting strip 4. The surface of the zipper sealing strip 5 is provided with anti-slip texture, and a zipper head 6 is slidably connected inside the zipper sealing strip 5.

[0042] Referring to the attached diagrams in the instruction manual Figures 1-6 As shown, the hemispherical buffer ball 304 is integrally molded with the hydrophilic polymer inner base layer 302, effectively preventing detachment and displacement after long-term use. From the perspective of puncture resistance, the unique hemispherical structure of the hemispherical buffer ball 304 gives it good stress dispersion characteristics. During the storage and transportation of fruits and vegetables, when subjected to compression or collision, sharp parts such as strawberry stems and cucumber thorns will exert concentrated pressure on the film bag. At this time, the hemispherical buffer ball 304, with its deformable characteristics, will first contact the sharp parts of the fruits and vegetables, and absorb external force energy through elastic deformation. Its curved shape can disperse the originally concentrated pressure along the spherical surface to multiple directions, thereby effectively reducing local pressure and making the pressure evenly distributed on a larger area of ​​the hydrophilic polymer inner base layer 302, significantly reducing the risk of the film bag being punctured and providing reliable puncture protection for the film bag.

[0043] In terms of preservation, the hemispherical buffer ball 304 avoids direct and close contact between fruits and vegetables and the film bag, forming a tiny air buffer layer inside the film bag. This buffer layer not only further cushions external forces but also increases the internal air circulation space. At the same time, the hemispherical buffer ball 304 and the second breathable micropore 303 are staggered to ensure unobstructed gas exchange channels. Appropriate air circulation helps maintain the uniform distribution of gas components inside the film bag. Combined with the second breathable micropore 303, it is more conducive to gas exchange between the inside and outside of the film bag, thus creating a more suitable breathing environment for fruits and vegetables. In addition, reducing direct contact between fruits and vegetables and the film bag can prevent damage to the surface of fruits and vegetables due to friction and compression, avoid damage becoming a breakthrough point for microbial invasion, reduce the possibility of fruits and vegetables rotting and spoiling, and further extend the shelf life of fruits and vegetables.

[0044] In actual use, the fruits and vegetables to be preserved are placed inside the film bag. By pulling the zipper head 6, the zipper sealing strip 5 is tightly engaged, achieving a seal on the film bag and effectively preventing the entry of external air, moisture, and microorganisms. At this time, due to the anti-slip texture on the surface of the zipper sealing strip 5, it is easier and less strenuous for users to open and close the film bag, and it can ensure the stability of the sealing structure during repeated use. During the storage of fruits and vegetables, the first breathable micropore 102 and the second breathable micropore 303 achieve appropriate gas exchange between the inside and outside of the film bag, maintain a suitable oxygen and carbon dioxide concentration inside the bag, and inhibit the respiration of fruits and vegetables. At the same time, the hydrophilic polymer base layer of the buffer inner layer 3 absorbs excess moisture released by fruits and vegetables, maintains a suitable humidity inside the film bag, delays the deterioration of fruits and vegetables, and achieves the purpose of efficient preservation.

[0045] Working principle: When using this high-toughness puncture-resistant fruit and vegetable preservation film bag, the modified high-density polyethylene base layer 101 of the puncture-resistant outer layer 1 has high strength and toughness through special modification treatment. When subjected to sharp objects, the breathable micropores 102 opened in the modified high-density polyethylene base layer 101 form a mesh structure, which increases the overall connection effect. Furthermore, the puncture-resistant outer layer 1, the protective middle layer 2 and the buffer inner layer 3 are set up in a multi-layer configuration to achieve the puncture-resistant effect. The connecting strip 4, which is heat-pressed at the upper end of the opening of the puncture-resistant outer layer 1, seals the film bag through the internal zipper sealing strip 5 and zipper head 6. Through the zipper sealing structure, it effectively blocks the entry of external air, moisture and microorganisms, reduces the contact between fruits and vegetables and the external environment, and further extends the shelf life of fruits and vegetables. The anti-slip texture on the surface of the zipper sealing strip 5 makes it easy for users to open and close the film bag and ensures the stability of the sealing structure during use.

[0046] The natural rubber latex layer 202 and the silicone pressure-sensitive adhesive layer 203 on both sides of the composite base layer 201 are flexible and viscous. When subjected to external force, they can buffer and disperse stress to avoid stress concentration. Together with the hydrophilic polymer outer base layer 301, the hydrophilic polymer inner base layer 302 and the hemispherical buffer ball 304, they absorb and disperse external force through deformation, reduce the impact of sharp objects on the film bag, and jointly improve the puncture resistance of the film bag. The hydrophilic polymer outer base layer 301 and the hydrophilic polymer inner base layer 302 of the buffer inner layer 3 are hydrophilic and can absorb excess moisture released by fruits and vegetables, preventing the fruits and vegetables from rotting due to excessive humidity inside the film bag.

[0047] The first and second breathable micropores 102 and 303 are aligned and evenly distributed. During storage, fruits and vegetables respire. Through these micropores, moderate gas exchange can occur between the inside and outside of the bag, maintaining a suitable gas composition ratio inside the bag, inhibiting excessive respiration, slowing down spoilage, and increasing overall usability.

[0048] Although 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 alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-toughness, puncture-resistant fruit and vegetable preservation film bag, comprising: The puncture-proof outer layer (1), together with the protective middle layer (2) and the buffer inner layer (3), are sequentially fitted from the outside to the inside to form the main body of the film bag. The puncture-proof outer layer (1), the protective middle layer (2) and the buffer inner layer (3) are formed by hot pressing and closing to form the main body of the fruit and vegetable fresh-locking film bag. The features are as follows: the stab-proof outer layer (1) is composed of a modified high-density polyethylene base layer (101) and a breathable micropore (102), and the breathable micropore (102) is uniformly opened in the modified high-density polyethylene base layer (101); the protective middle layer (2) is composed of a composite sheet base layer (201), a natural rubber latex layer (202) and an organosilicon pressure-sensitive adhesive layer (203) bonded together, and the natural rubber latex layer (202) abuts against the modified high-density polyethylene base layer (101); The inner buffer layer (3) is composed of a hydrophilic polymer outer base layer (301), a hydrophilic polymer inner base layer (302), a breathable microporous layer (303), and a hemispherical buffer ball (304). The inner wall of the inner buffer layer (3) is the hydrophilic polymer inner base layer (302). The upper end of the opening of the puncture-proof outer layer (1) is hot-pressed with a connecting strip (4), and a zipper sealing strip (5) is connected inside the connecting strip (4). The surface of the zipper sealing strip (5) is provided with anti-slip texture, and a zipper head (6) is slidably connected inside the zipper sealing strip (5).

2. The high-toughness, puncture-resistant fruit and vegetable preservation film bag according to claim 1, characterized in that: The puncture-resistant outer layer (1), the protective middle layer (2), and the buffer inner layer (3) are nested together, and the openings of the puncture-resistant outer layer (1), the protective middle layer (2), and the buffer inner layer (3) are bonded together by heat pressing.

3. The high-toughness, puncture-resistant fruit and vegetable preservation film bag according to claim 1, characterized in that: The silicone pressure-sensitive adhesive layer (203) abuts against the hydrophilic polymer outer base layer (301), and the silicone pressure-sensitive adhesive layer (203) and the natural rubber latex layer (202) are coated on both sides of the composite sheet base layer (201).

4. The high-toughness, puncture-resistant fruit and vegetable preservation film bag according to claim 1, characterized in that: The hydrophilic polymer outer base layer (301) and the hydrophilic polymer inner base layer (302) are stacked together to form the substrate of the buffer inner layer (3).

5. A high-toughness, puncture-resistant fruit and vegetable preservation film bag according to claim 1, characterized in that: The hydrophilic polymer inner base layer (302) is uniformly provided with breathable micropores (303), and hemispherical buffer balls (304) are equidistantly arranged on the surface of the hydrophilic polymer inner base layer (302).

6. The high-toughness, puncture-resistant fruit and vegetable preservation film bag according to claim 1, characterized in that: The breathable micropores (303) and the hemispherical buffer ball (304) are staggered, and the hemispherical buffer ball (304) is integrated with the hydrophilic polymer inner base layer (302).

7. The high-toughness, puncture-resistant fruit and vegetable preservation film bag according to claim 1, characterized in that: The second breathable micropore (303) is aligned with the first breathable micropore (102).

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