Antibacterial food packaging film and processing technology thereof

Abstract

The invention relates to the technical field of food packaging, and discloses an antibacterial food packaging film which is characterized by comprising a basic packaging material, an antibacterial agent, other additives, solid moisture absorption particles and a casting polypropylene film. The basic packaging material comprises polypropylene and polyethylene. The antibacterial agent is an anionic antibacterial agent. Anhydrous calcium chloride is adopted as the solid moisture absorption particles. The other additives comprise a plasticizer and a solubilizer. The preparation method has the advantages that the preparation process flow is simple, materials and equipment used in processing are daily visible and are easy to obtain, and the cost is low; the antibacterial food packaging film prepared by the invention has good antibacterial performance and also has relatively good waterproofness and air tightness, the waterproofness and oxygen barrier property of the packaging film can be improved, and the safety performance of food is improved; the antibacterial food packaging film prepared by the invention is good in drying performance, capable of avoiding reproduction of bacteria and capable of protecting food.

Description

Technical Field

[0001] The present invention relates to the technical field of food packaging, and specifically to an antibacterial food packaging film and its processing technology. Background Technique

[0002] Selecting antibacterial film packaging in food packaging is the most beneficial. It can inhibit the growth of microorganisms, ensure food safety, and extend the shelf life of food. At present, there are various types of plastic films for food packaging, mainly including catalytic inorganic antibacterial agent films, natural and polymer antibacterial agent films, compound antibacterial agent films, inorganic antibacterial agent films, and organic antibacterial agent films, etc.

[0003] However, the existing antibacterial films have single functionality, resulting in poor effects when packaging food and being unable to provide better packaging protection for food.

[0004] Therefore, we have proposed an antibacterial food packaging film and its processing technology to solve the problem. Summary of the Invention

[0005] (1) Technical Problems to be Solved

[0006] Aiming at the deficiencies of the prior art, the present invention provides an antibacterial food packaging film and its processing technology, which solves the problems in the above background technique.

[0007] (2) Technical Solutions

[0008] To achieve the above object, the present invention provides the following technical solution: An antibacterial food packaging film, characterized in that it includes: a basic packaging material, an antibacterial agent, other additives, solid moisture-absorbing particles, and a cast polypropylene film.

[0009] Preferably, the basic packaging material includes polypropylene and polyethylene.

[0010] Preferably, the antibacterial agent uses an anionic antibacterial agent.

[0011] Preferably, the solid moisture-absorbing particles use anhydrous calcium chloride.

[0012] Preferably, the other additives include a plasticizer, a solubilizer, etc.

[0013] In addition to the above technical solutions, the present invention further includes:

[0014] A processing technology for an antibacterial food packaging film, including the following steps:

[0015] S1: Prepare the inner layer

[0016] Select suitable polypropylene, polyethylene and other additives, and conduct pretreatment to ensure their quality and performance. Add the materials into an extruder, and through heating and extrusion, make them into a molten plastic fluid. The molten plastic passes through a die and is formed into a tubular film blank according to the required shape and size. Introduce the tubular blank into a blow molding device, and inflate the blank to form an inner layer film with a certain thickness and shape. Cool the blown film to make it solidify and take shape, maintaining a stable shape and performance. According to needs, wind up or cut the made inner layer film into specific sizes and specifications;

[0017] S2: Prepare the moisture absorption layer

[0018] Place the inner layer materials prepared in step S1 opposite to each other to form an accommodation space, and then evenly fill anhydrous calcium chloride in the space between the two interlayers, ensuring that the edges of the interlayers are well sealed to prevent leakage of moisture-absorbing particles, thus making the moisture absorption layer;

[0019] S3: Prepare the antibacterial layer

[0020] Put the anionic antibacterial agent into an extruder, and through heating and extrusion, make the mixture form a continuous antibacterial layer material. Prepare a suitable base material, such as a film. Mix the antibacterial material with a suitable solvent or adhesive to make an antibacterial coating, and use a coating device to evenly coat the antibacterial coating on the base material to form an antibacterial layer;

[0021] S4: Prepare the barrier layer

[0022] Add polypropylene raw materials into an extruder, melt it at a high temperature, and the molten polypropylene flows out through a casting die head and is quickly cooled and shaped on a cooling roll to form a continuous film. Stretch the film longitudinally and transversely as needed to improve its mechanical properties and barrier properties;

[0023] S5: Prepare the antibacterial food packaging film

[0024] Compound the inner layer, moisture absorption layer, antibacterial layer, and barrier layer together through processes such as lamination and coating to make the antibacterial food packaging film.

[0025] (III) Beneficial effects

[0026] Compared with the prior art, the present invention provides an antibacterial food packaging film and its processing technology, having the following beneficial effects:

[0027] 1. The process flow prepared by the present invention is simple. Secondly, the materials and equipment used in the processing are all commonly seen in daily life, are relatively easy to obtain, and have low costs.

[0028] 2. The antibacterial food packaging film prepared by the present invention not only has good antibacterial performance, but also has good waterproofness and airtightness, which can improve the waterproofness and oxygen barrier property of the packaging film, and greatly improve the safety performance of food.

[0029] 3. The antibacterial food packaging film prepared by the present invention has good drying performance, which can avoid the reproduction of bacteria and play a protective role for food. Specific embodiments

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] An antibacterial food packaging film, characterized in that it includes: a basic packaging material, an antibacterial agent, other additives, solid hygroscopic particles, and a cast polypropylene film.

[0032] Among them, the basic packaging material includes polypropylene and polyethylene; here, polypropylene has high mechanical strength and good heat resistance, while polyethylene has good flexibility, transparency and water resistance.

[0033] The antibacterial agent uses an anionic antibacterial agent; here, the anionic antibacterial agent has good antibacterial effect, broad antibacterial spectrum, can inhibit and kill various bacteria, molds and other microorganisms, and has long-term antibacterial property.

[0034] The solid hygroscopic particles use anhydrous calcium chloride; here, anhydrous calcium chloride can absorb the moisture in the package, keep the inside of the package dry, and inhibit the growth and reproduction of bacteria;

[0035] Other additives include plasticizers and solubilizers; here, plasticizers can improve the flexibility and processing performance of the packaging film, making the packaging film softer, easier to fold and stretch; solubilizers can improve the compatibility between different components, enabling additives such as antibacterial agents to be better dispersed in the basic packaging material, thereby improving the antibacterial performance and physical properties of the packaging film.

[0036] In addition to the above technical solutions, a processing process of an antibacterial food packaging film includes the following steps:

[0037] S1: Prepare the inner layer

[0038] Select suitable polypropylene, polyethylene and other additives, and conduct pretreatment to ensure their quality and performance. Add the materials into an extruder, and through heating and extrusion, make them into a molten plastic fluid. The molten plastic passes through a die and is formed into the desired shape and size to form a tubular film blank. Introduce the tubular blank into a blow molding device, and inflate the blank to form an inner layer film with a certain thickness and shape. Cool the blown film to make it solidify and take a stable shape and performance. As needed, wind up or cut the made inner layer film into specific sizes and specifications;

[0039] S2: Prepare the moisture absorption layer

[0040] Place the inner layer materials prepared in step S1 opposite to each other to form a containing space, and then evenly fill anhydrous calcium chloride in the space between the two interlayers, ensuring that the edges of the interlayers are well sealed to prevent the leakage of moisture-absorbing particles, thus making the moisture absorption layer;

[0041] S3: Prepare the antibacterial layer

[0042] Put the anionic antibacterial agent into an extruder, and through heating and extrusion, make the mixture form a continuous antibacterial layer material. Prepare a suitable base material, such as a film. Mix the antibacterial material with a suitable solvent or adhesive to make an antibacterial coating, and use a coating device to evenly coat the antibacterial coating on the base material to form an antibacterial layer;

[0043] S4: Prepare the barrier layer

[0044] Add polypropylene raw materials into an extruder, melt it at a high temperature, and the molten polypropylene flows out through a casting die head and is quickly cooled and shaped on a cooling roller to form a continuous film. Stretch the film longitudinally and transversely as needed to improve its mechanical properties and barrier properties;

[0045] S5: Prepare the antibacterial food packaging film

[0046] Compound the inner layer, moisture absorption layer, antibacterial layer and barrier layer together through processes such as lamination and coating to make the antibacterial food packaging film.

[0047] In summary: The prepared inner layer can be in direct contact with the packaged food, having good food safety. The prepared moisture absorption layer can adsorb the moisture inside the packaging film, keep the inside dry, and inhibit the generation of bacteria. The prepared antibacterial layer has a good isolation and sterilization effect on germs, improving the antibacterial performance of the packaging film. The prepared barrier layer makes the packaging film have better waterproofness and airtightness, which can improve the waterproofness and oxygen barrier property of the packaging film. Finally, it can enhance the antibacterial performance and other functions of the whole packaging film, greatly strengthening the protection of food and enhancing food safety.

[0048] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art will appreciate that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An antibacterial food packaging film, characterized in that: include: Basic packaging materials, antimicrobial agents, other additives, solid hygroscopic particles, cast polypropylene film.

2. The antibacterial food packaging film according to claim 1, characterized in that: The basic packaging material includes polypropylene and polyethylene.

3. The antibacterial food packaging film according to claim 1, characterized in that: The antibacterial agent is a cationic antibacterial agent.

4. The antibacterial food packaging film according to claim 1, characterized in that: The solid hygroscopic particles are anhydrous calcium chloride.

5. The antibacterial food packaging film according to claim 1, characterized in that: The other additives include plasticizers, solubilizers, etc.

6. A processing technology for antibacterial food packaging film, characterized in that: The following steps are involved: S1: Preparation of inner layer Select appropriate polypropylene, polyethylene and other additives, and pre-treat them to ensure their quality and performance. Add the materials to the extruder, heat and extrude them to make them into a molten plastic fluid. The molten plastic passes through a mold and is molded into the required shape and size to form a tubular film blank. The tubular blank is introduced into the blow molding equipment, and the blank is expanded by inflation to form an inner film with a certain thickness and shape. The blown film is cooled to solidify and shape it to maintain a stable shape and performance. The inner film is rolled up or cut into specific sizes and specifications as needed. S2: Preparation of hygroscopic layer The inner layer materials prepared in step S1 are placed opposite to each other to form a containing space, and then anhydrous calcium chloride is evenly filled in the space between the two interlayers, ensuring that the edges of the interlayers are well sealed to prevent the moisture absorbing particles from leaking, thereby forming a moisture absorbing layer; S3: Preparation of antibacterial layer Putting the anionic antibacterial agent into an extruder, heating and extruding the mixture to form a continuous antibacterial layer material, preparing a suitable base material, such as a film, mixing the antibacterial material with a suitable solvent or adhesive to make an antibacterial coating, and using a coating device to evenly coat the antibacterial coating on the base material to form an antibacterial layer; S4: Preparation of barrier layer The polypropylene raw material is added into the extruder and melted at high temperature. The molten polypropylene flows out through the casting die and is quickly cooled and shaped on the cooling roller to form a continuous film. The film is stretched longitudinally and transversely as needed to improve its mechanical properties and barrier properties. S5: Preparation of antimicrobial food packaging film The inner layer, the hygroscopic layer, the antibacterial layer and the barrier layer are compounded together through lamination, coating and other processes to produce an antibacterial food packaging film.