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Introduction to Preservation Materials


1、Polyethylene, abbreviated as PE
Safe and environmentally friendly, no plasticizers added, safeHigh integrity, this material is mainly used forThe packaging of food, we usually buy it backThis film is used for fruits and vegetables, includingIncluding semi-finished vegetables purchased from supermarketsThey all use this material.

2、Polyvinylidene chloride, abbreviated as PVDC

PVDC materials can effectively prevent the penetration of gases, water vapor, odors, and ultraviolet rays, while also resisting the erosion of chemical substances. Therefore, they are widely used in the fields of food, medicine, and packaging.Compared with other plastics, PVDC materials have higher barrier and chemical resistance, as well as good transparency and processability. Currently, PVDC materials are widely used globally and are still in their early stagesR&D and production of PVDC material preservation products.

3、Polyvinyl chloride, abbreviated as PVC

This material can also be used for food packagingInstall, but it has safety implications for the human bodyA certain impact, not much introduction, already TaobaoEliminate.
Because there are two substances in PVC film that can cause cancerAbility, one is VCM (Vinyl Complex Monomer), and the other isDEHA, if the composition of VCM is within 1PPM (metric)Within the range of one millionth, it is non-toxicIf it exceeds the limit, there is a possibility of cancer.

4、LDPE low-density polyethylene

LDPE low-density polyethylene, also a material for fresh-keeping bagsQuality, it has good oxygen and odor blocking effects, LDPELow density polyethylene has a certain degree of flexibility and is suitable for productionMore plasticizers need to be added during the process. This materialThe fresh-keeping film has relatively poor safety and cannot be addedHot, do not come into contact with oily food.

5、Aluminum titanium foil

Aluminum foil is a material for fresh-keeping bags, made of high-purity materialsMade from aluminum and added iron elements. It has antiCharacteristics such as bacterial properties, positive isolation, antioxidant properties, and safetyHigher completeness. Aluminum foil cling film is opaque and inconvenientClearly identify the ingredients inside and store for a longer period of time. althoughThe aluminum bowl drop cling film lacks transparency, but it is stillA material with good preservation effect has a higher cost.

Introduction to the functions of An'erxian fresh-keeping materials


1、Prevent spoilage of vegetables and fruits during transportation

Anersin Fresh Preservation Technology can efficiently isolate external air andThe invasion of bacteria slows down the rate of food spoilage. haveStrong barrier effect, preventing vegetables and fruits from coming into contact with water and oxygen,So as to slow down the oxidation rate and extend the shelf life of food.

2、Ensure the freshness of vegetable and fruit products

Anerxian can maintain its freshness while preserving food,This includes maintaining the natural humidity and taste of fruits and vegetables.The transparency of the fresh-keeping bag allows users to visually observeTo the state of the food, it is convenient to determine its freshness.

3、Prevent cross contamination of vegetable and fruit food flavors

Anerxian can effectively isolate the odor between different foods,Prevent cross contamination of food flavors and maintain the original appearance of foodFlavor.

4、Anerxian Oxygen Isolation Technology: The Liveliness of Endurance Fruit and Vegetable Ingredients

The main function of traditional fresh-keeping bags is to prevent oxygen from entering, whileWith the advancement of technology, Anerxian fresh-keeping bags have upgraded to more advanced oxygen barriersLeaving and killing techniques, this means that fruits, vegetables, and ingredients can be kept in the bagLonger freshness, delayed food oxidation, thereby reducing wasteImprove the endurance of ingredients.

PVDC antibacterial preservation bag


PVDC (Polyvinylidene Chloride) is a commonly used material for making plastic bags. PVDC film has excellent barrier performance, with low transmittance to various gases, especially under humid conditions. It has excellent gas resistance, oil resistance, chemical resistance, and excellent barrier performance. However, the processing of PVDC films is relatively difficult. This is because PVDC is a crystalline polymer, and the longer the film is exposed to high temperature during processing, the higher the crystallization rate; Moreover, the glass transition temperature of PVDC is lower than room temperature, and crystallization may occur even at room temperature. In addition, there is decomposition during high-temperature processing, and the generated chlorides can corrode the equipment, making it difficult to produce high-quality PVDC films.
At present, although PVDC single film has been applied in preservation, PVDC composite film with excellent performance has a broader application prospect. PVDC composite film can be divided into two types according to the process: coated film and co extruded film. PVDC coated film is coated with PVDC copolymer latex and then composite, which is relatively complicated and inefficient. The quality of the finished product is greatly affected by the environment and process; PVDC co extruded film is formed by direct co extrusion of PE or PP with PVDC, which has high efficiency and excellent product quality. However, PVDC co extruded film technology is difficult and requires extremely high equipment requirements.
This project uses PVDC and PE multi-layer co extrusion to obtain PVDC composite films. The project was jointly developed by researchers from the National Nanometer Center of the Chinese Academy of Sciences and the General Research Institute of Chemical Technology. The composite film has good mechanical properties and is easy to process and use; Excellent barrier performance, with extremely low oxygen and moisture permeability; It has inhibitory and bactericidal effects on Escherichia coli, Staphylococcus aureus, and excellent antibacterial properties. In addition, the material has been modified with nanomaterials, which has certain degradation performance and good environmental protection performance. This PVDC composite film is free of heavy metals, and its xylene soluble extract and n-hexane soluble extract meet US FDA standards. Its various properties can meet the requirements of food packaging, making it a good high barrier packaging material that can be used for packaging fruits, vegetables, meat products, dried fruits, and other products.
Antibacterial mechanism:
Nano zinc oxide has good biocompatibility and low cytotoxicity, and is often used in fine chemicals and medical applications. Compared with TiO2, ZnO still has better antibacterial effects under no light conditions, so ZnO has better application prospects than other antibacterial agents. Coating ZnO and exploring its inhibitory effect on bacteria. The morphology and size of ZnO can affect its antibacterial activity, and zinc oxide with different morphologies exhibits significant differences in antibacterial activity.

The main mechanisms of antibacterial or bactericidal properties of nano ZnO are as follows:
1. Contact sterilization mechanism, the release of free Zn2+, achieves the purpose of sterilization, and after killing bacteria, Zn2+can be released from the cell, continuing to play a bactericidal role; The interaction between nanoparticles and the surface of bacterial cells disrupts the cell wall and releases the contents of the bacterial cells.
2. The photocatalytic antibacterial mechanism produces reactive oxygen species, which are induced by nanoparticles to produce reactive oxygen species. A series of chemical reactions occur within the bacteria, such as membrane damage, ultimately leading to bacterial death.The antibacterial co extruded PVDC composite film in this project uses nano ZnO modified material, which can produce reactive oxygen species under visible light and has stable performance against bacteria. Viruses have a wide range of killing and inhibitory effects.