Antibacterial degradable composite film
By designing a composite membrane structure that combines aluminum foil and an antibacterial polyethylene layer, the problem of the single function of existing food packaging materials is solved, achieving antibacterial and heat insulation effects and reducing environmental pollution.
Patent Information
- Application Number
- CN202423227817.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2025-11-14
- Estimated Expiration
- 2034-12-26
AI Technical Summary
Existing food packaging materials, such as polyethylene film and polyvinyl chloride film, have limited functionality and cannot meet the requirements for antibacterial and heat insulation performance. Furthermore, plastic residues cause environmental pollution.
A composite membrane structure was designed, including an outer tensile layer, a middle layer consisting of aluminum foil, an antibacterial layer, and an aging-resistant layer, and an inner antibacterial polyethylene layer. The antibacterial layer and aluminum foil are used to achieve a double-layer antibacterial effect, and biodegradable materials are used to avoid environmental pollution.
It improves the antibacterial properties of food packaging, maintains food freshness, reduces environmental pollution, and has good environmental protection properties.
Smart Images
Figure CN223545937U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of packaging film technology, and more specifically, to an antibacterial and biodegradable composite film. Background Technology
[0002] As one of the most commonly used food packaging materials, plastic products pose a significant food safety risk due to their direct contact with food, which has always been a concern for society.
[0003] In the current food packaging industry, most packaging forms are still relatively simple, such as plastic film packaging, including polyethylene film, polyvinyl chloride film, etc. The simple film structure has limited functionality and cannot meet the performance requirements of antibacterial, heat insulation and other properties, which affects the quality of the packaged products. Utility Model Content
[0004] This invention provides an antibacterial and biodegradable composite film that overcomes some or all of the defects of the prior art.
[0005] According to the present invention, an antibacterial and biodegradable composite film includes a composite film body, which includes an outer layer, a middle layer and an inner layer stacked sequentially. The outer layer is a tensile layer, the middle layer includes an aluminum foil, an antibacterial layer and an aging-resistant layer, and the inner layer is an antibacterial polyethylene layer. The antibacterial layer is disposed between the aluminum foil and the aging-resistant layer. The aluminum foil and the antibacterial polyethylene layer are bonded together, and the aging-resistant layer and the tensile layer are bonded together.
[0006] With the addition of an antibacterial layer, an antibacterial polyethylene layer, and aluminum foil, it has good heat insulation, moisture-proof, and antibacterial effects, achieving double-layer antibacterial properties and improving the overall antibacterial effect of the composite membrane. In addition, all materials are made of biodegradable materials, which can be degraded by bacteria in the soil, avoiding residual film pollution of the soil and exhibiting high environmental friendliness.
[0007] Preferably, the antibacterial polyethylene layer, aluminum foil, antibacterial layer, aging resistant layer and tensile layer are all connected by a biodegradable adhesive.
[0008] Through the above methods, it can decompose naturally, enhancing the environmental friendliness of the entire composite membrane and reducing environmental pollution.
[0009] Preferably, the antibacterial polyethylene layer is one of sorbic acid modified LDPE film and chitosan modified LDPE film.
[0010] Preferably, the thickness of the antibacterial polyethylene layer is 10-14 μm.
[0011] By adding chitosan to improve LDPE film, the antibacterial polyethylene layer has a stronger ability to inhibit the reproduction of various bacteria and viruses, and has the advantages of low toxicity, good film-forming properties, good biocompatibility, and no antigenicity.
[0012] Preferably, the thickness of the aluminum foil is 70-80 μm.
[0013] The aluminum foil effectively isolates the food from oxygen, moisture, and light, maintaining its freshness and quality.
[0014] Preferably, the thickness of the antibacterial layer is 8-11 μm.
[0015] The antibacterial layer is made of chitosan, which enhances the antifungal properties of the composite membrane.
[0016] Preferably, the thickness of the aging-resistant layer is 5-11 μm.
[0017] The aging-resistant layer is made of polyvinyl alcohol. By setting the aging-resistant layer, the aging resistance of the composite membrane body is increased, making the composite membrane body more practical.
[0018] Preferably, the thickness of the tensile layer is 15-19 μm.
[0019] The tensile layer is made of polylactic acid, which improves the strength of the composite membrane. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the cross-sectional structure of an antibacterial and biodegradable composite membrane. Detailed Implementation
[0021] To further understand the content of this utility model, a detailed description of the utility model is provided in conjunction with the embodiments. It should be understood that the embodiments are merely illustrative and not limiting of the utility model.
[0022] Example 1
[0023] Please see Figure 1 This embodiment provides an antibacterial and biodegradable composite film, which includes a composite film body 100. The composite film body 100 includes an outer layer, a middle layer and an inner layer stacked sequentially. The outer layer is a tensile layer 130. The middle layer includes an aluminum foil 121, an antibacterial layer 122 and an aging-resistant layer 123. The inner layer is an antibacterial polyethylene layer 110. The antibacterial layer 122 is disposed between the aluminum foil 121 and the aging-resistant layer 123. The aluminum foil 121 is bonded to the antibacterial polyethylene layer 110, and the aging-resistant layer 123 is bonded to the tensile layer 130.
[0024] The antibacterial and biodegradable composite membrane disclosed herein, through the arrangement of antibacterial layer 122, antibacterial polyethylene layer 110 and aluminum foil 121, has good heat insulation, moisture-proof and antibacterial effects, realizes double-layer antibacterial, and improves the overall antibacterial effect of composite membrane body 100. In addition, all of them are made of biodegradable materials, which can be degraded by bacteria in the soil, avoiding residual film from polluting the soil, and have high environmental protection.
[0025] In this embodiment, the antibacterial polyethylene layer 110, aluminum foil 121, antibacterial layer 122, aging resistant layer 123, and tensile layer 130 are all connected by a biodegradable adhesive.
[0026] Through the above methods, it can decompose naturally, enhancing the environmental friendliness of the entire composite membrane and reducing environmental pollution.
[0027] In this embodiment, the antibacterial polyethylene layer 110 is a sorbic acid modified LDPE film or a chitosan modified LDPE film.
[0028] In this embodiment, the thickness of the antibacterial polyethylene layer 110 is 10-14 μm.
[0029] By adding chitosan to improve LDPE film, the antibacterial polyethylene layer 110 has a stronger ability to inhibit the reproduction of various bacteria and viruses, and has the advantages of low toxicity, good film-forming properties, good biocompatibility, and no antigenicity.
[0030] In this embodiment, the thickness of the aluminum foil 121 is 70-80 μm.
[0031] The aluminum foil 121 effectively isolates the intrusion of oxygen, moisture, and light, thus maintaining the freshness and quality of food.
[0032] In this embodiment, the thickness of the antibacterial layer 122 is 8-11 μm.
[0033] The antibacterial layer 122 is made of chitosan. By setting the antibacterial layer 122, the antifungal properties of the composite membrane body 100 are increased.
[0034] In this embodiment, the thickness of the aging-resistant layer 123 is 5-11 μm.
[0035] The aging-resistant layer 123 is made of polyvinyl alcohol. By setting the aging-resistant layer 123, the aging resistance of the composite membrane body 100 is increased, making the composite membrane body 100 more practical.
[0036] In this embodiment, the thickness of the tensile layer 130 is 15-19 μm.
[0037] Among them, the tensile layer 130 is polylactic acid, and the strength of the composite membrane body 100 is improved by setting the tensile layer 130.
[0038] It is readily understood that those skilled in the art can combine, split, or reorganize the embodiments provided in this application to obtain other embodiments, all of which do not exceed the protection scope of this application.
[0039] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the embodiments shown are only part of the embodiments of the present invention. The actual structure is not limited to this. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.
Claims
1. An antibacterial and biodegradable composite film, characterized in that, The composite membrane body (100) includes an outer layer, a middle layer and an inner layer stacked in sequence. The outer layer is a tensile layer (130). The middle layer includes an aluminum foil (121), an antibacterial layer (122) and an aging-resistant layer (123). The inner layer is an antibacterial polyethylene layer (110). The antibacterial layer (122) is disposed between the aluminum foil (121) and the aging-resistant layer (123). The aluminum foil (121) is bonded to the antibacterial polyethylene layer (110), and the aging-resistant layer (123) is bonded to the tensile layer (130).
2. The antibacterial and biodegradable composite film according to claim 1, characterized in that: The antibacterial polyethylene layer (110), aluminum foil (121), antibacterial layer (122), aging resistant layer (123) and tensile layer (130) are all connected by a biodegradable adhesive.
3. The antibacterial and biodegradable composite film according to claim 1, characterized in that: The antibacterial polyethylene layer (110) is a sorbic acid modified LDPE film and a chitosan modified LDPE film.
4. The antibacterial and biodegradable composite film according to claim 1, characterized in that: The thickness of the antibacterial polyethylene layer (110) is 10-14 μm.
5. The antibacterial and biodegradable composite film according to claim 1, characterized in that: The thickness of the aluminum foil (121) is 70-80 μm.
6. The antibacterial and biodegradable composite film according to claim 1, characterized in that: The thickness of the antibacterial layer (122) is 8-11 μm.
7. The antibacterial and biodegradable composite film according to claim 1, characterized in that: The thickness of the aging resistant layer (123) is 5-11 μm.
8. The antibacterial and biodegradable composite film according to claim 1, characterized in that: The thickness of the tensile layer (130) is 15-19 μm.