In the packaging of fast food, clean vegetables, and other aspects, these foods have the characteristics of freshness, convenience, nutrition, and pollution-free, and their consumption is not high in major and medium-sized cities
Break the increase. There is an increasing demand for nitrogen filling and preservation in continuous box type modified atmosphere packaging machines.
Nitrogen filled fresh-keeping packaging machine
Generally, it can be maintained for one week at a high temperature of 40 ℃. The formula for this preservative is: 24 kilograms of water, 0.36 kilograms of salt, and 0.09 kilograms of glucose,
1.2 kilograms of maltodextrin, adjust to a pH 3.5 mixture with citric acid. The shelf life is relatively short, usually 10 days at 2-4 ℃.
In 1994, the international paper industry was the first to introduce rooftop box packaging into the Chinese market, with domestic brands such as Shanghai Guangming, Beijing Sanyuan, Inner Mongolia Yili, and Hangzhou Dingjin
Important dairy production enterprises have successively cooperated with them to jointly explore the box packaging market.
The preservation technology of modified atmosphere packaging is the key for manufacturers of modified atmosphere sealing machines, and the degree of food preservation directly affects customer sales. Modified atmosphere sealing machines are
Modified atmosphere packaging plays a crucial role and has professionally analyzed several factors that affect the shelf life of food.
1、 Vacuum displacement rate
The vacuum replacement rate is a key factor affecting shelf life, and its accuracy is usually represented by the residual oxygen content inside the packaging container. The lower the residual oxygen content, the higher the replacement rate,
The more controllable the shelf life for customers.
Measurement method;
In the mode of modified atmosphere packaging, the packaging inside the tray is filled with nitrogen or CO2 separately, and then the oxygen content is measured using a Witt portable analytical instrument
The percentage of residual oxygen obtained by measuring is called the vacuum displacement rate error. Approximately O2: N2=1:4 in the air, if the vacuum displacement rate is less than 97%,
That 15% of the original gas is still inside the box, completely losing the significance of gas regulation 1.1. png
Nitrogen filled fresh-keeping packaging machine
2、 Filling gas mixing accuracy
At the same time of vacuum replacement, it is necessary to fill the sealed packaging space with a well proportioned preservation gas, and the mixing accuracy of the preservation gas is achieved through the mixing system.
The accuracy and stability of the mixing system determine the accuracy and stability of the preservation gas. The low accuracy of the mixing system can lead to the following conditions: CO2 dissolution
In water and mixed with a weak acidic taste, excessive CO2 concentration can cause cooked food to become acidic and CO2 to dissolve in water, resulting in an increasing amount of CO2 in modified atmosphere packaging
The small and unstable mixed gas ratio, as well as the significant difference in the rate of disappearance of CQ2, can lead to uneven shelf life of food preservation and the situation of not opening the packaging
The situation cannot be determined. Unstable mixing systems will become increasingly unstable with production use.
3、 Initial bacterial count
It refers to the number of bacteria contained in food before packaging. The more bacteria there are, the larger the bacterial reproduction base, and the worse the preservation effect of food. Therefore, when packaging food
Before use, it is necessary to be in a clean environment.
4、 Refrigerated environment
Temperature is one of the important factors affecting bacterial reproduction. If the storage temperature is higher than 7 degrees, CO2 will quickly dissolve in water, accelerate bacterial reproduction, and improve the effectiveness of modified atmosphere preservation
The fruit is greatly discounted, so the ideal environment for the entire food journey is 0-4 degrees Celsius.
Nitrogen filled fresh-keeping packaging machine
Non chemical new preservation technologies have broad application prospects in clean vegetable processing, mainly focusing on composite modified atmosphere packaging, also known as gas displacement packaging,
Internationally known as MAP packaging (i.e. Modified AtmospherePackaging). The principle of the composite modified atmosphere packaging machine is to use composite preservation gases (2-3 types)
Gas is mixed according to the characteristics of the food, and the air inside the packaging box or bag is replaced to change the external environment of the food inside the box (bag). Due to many micro factors
The growth and reproduction of organisms (bacteria) require O2, so reducing oxygen content can slow down the growth rate of bacteria (excluding anaerobic bacteria).
The composite modified atmosphere preservation produced by box packaging machines is a new preservation technology developed based on the traditional foundation mentioned above, which has certain requirements for the packaging environment. Its characteristics
The point is that there is no need for high-temperature sterilization, and refrigeration and preservation equipment is mainly used for food freezing processing and refrigeration and preservation? Refrigeration and preservation equipment is used to maintain a certain indoor temperature through refrigeration
Low temperature. The walls, floors, and flat roofs of refrigeration and preservation equipment are covered with insulation materials of a certain thickness to reduce external heat transfer. Can slow down breathing rate,
Extend storage life. Inhibiting the proliferation of pathogens generally leads to the spoilage of garden products. The suitable temperature for their growth and development is exactly the same as the temperature for harvesting products in the field,
Approximately 20-30 ℃.
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