The medical disposable paper bag is valid for one month, and the medical non-woven fabric and disposable medical corrugated paper bag are valid for six months; The validity period of paper-plastic packaging bags is 6 months.
Sterility of packaged products
The sterilization of food raw materials can be divided into thermal sterilization and cold sterilization. Up to now, the sterilization of food aseptic packaging materials is mainly thermal sterilization, which can be divided into ultra-high temperature sterilization and high temperature short-time sterilization. The cold sterilization methods of materials mainly refer to ultraviolet and microwave sterilization. Ultra-high temperature sterilization refers to the process of processing dairy products or other foods at the temperature of 135- 150 degrees for 2-8 seconds.
Because it has many advantages, especially it can solve the contradiction between killing microorganisms in products and maintaining food quality and nutritional value, it has been widely used in the production of milk, juice and juice drinks, soybean milk, tea, wine, mineral water and other products.
Materials with cooking smell can be sterilized at 70-75℃ for a short time at high temperature 15-20s. This method can keep the nutrition and flavor of the product well, and its typical application is to sterilize dairy products and some vegetable products.
Due to the particularity of material viscosity, PH value, heat sensitivity and easy oxidation, sterilization methods and equipment are also different. The PH value often determines the temperature and time of sterilization of materials, and the PH value depends on the amount and separation degree of acidic substances in food. The PH value of low acid food is greater than 4.6,
It can provide ideal growth conditions for pathogenic microorganisms, and spoilage microorganisms can also grow well. Generally, ultra-high temperature instantaneous sterilization is adopted. The PH value of acidic food is between 3.7 and 4.6, and the pathogenic bacteria in it are not easy to grow, but the spoilage bacteria can grow. Generally, ultra-high temperature instantaneous sterilization or high temperature short-time sterilization is adopted.
Low-acid food can be transformed into acidic food by adding acid or fermentation, thus reducing sterilization requirements and improving shelf life. This method is used to treat tomato sweat, cheese and so on in food. The PH value of food with high acidity is less than 3.7, and pathogenic bacteria and spoilage bacteria cannot grow under this acidity, so sterilization is not a problem that needs special attention, and quality assurance becomes the primary purpose.
Generally, pasteurization can meet the requirements, that is, 62 degrees for 30 minutes, or instantaneous ultra-high temperature sterilization or short-time high temperature sterilization, depending on the specific situation.
Extended data
existing problems
The technology and materials of aseptic packaging are in a mature state, but in the aseptic packaging made of paper, plastic and aluminum, such as brick bags, pillow bags and top bags, and in all packaging specifications with packaging capacity less than 250ml, the design of exposed drinking pipe holes is adopted. These uncovered drinking water pipe holes are easy to attach and hide impurities harmful to human body, such as dust and bacteria.
When consumers directly insert into the drinking tube hole without taking necessary sanitary measures, pollutants will be brought into the drink, which will bring great health hazards to drinking.
Over the years, experts and researchers in aseptic packaging industry have conducted long-term exploration and research on hygienic drinking in aseptic packaging. Fortunately, a patented technology of "sanitary beverage box" was invented in the industry. In order to stop consumers from drinking "toxic drinks" as soon as possible, people of insight strongly appeal to the government to introduce mandatory hygienic drinking standards for aseptic packaging.
The patented technology of "sanitary beverage box" will be transformed and applied as soon as possible. The hygienic drinking standard of aseptic packaging has entered the agenda of relevant state departments. Only in this way can there be real aseptic packaging in the market and consumers can "drink with confidence"
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