Many things have a shelf life, how is it calculated?

We know that a lot of food on the earth today is processed from a variety of foods, after all, in order to keep any food from the impact of oxidation in the earth's interior, people need to use its high-end preservation technology to keep the food better, and the nutrition will not be lost. This is why in many lives nowadays, we can see that everything that is food has its expiration date.

So many things have an expiration date, so how do you get the expiration date? There are several reasons for this. <>

First, the use of oxidation reaction.

Conduct experiments. First of all, regarding the shelf life of many foods, people are oxidizing in the laboratory**, food and oxygen react, and how long is the reaction time and spoilage time of the two? By waiting or not receiving directly in the body, if there is no good shelf life, this will undoubtedly give us a food safety.

But such results are also called, after all, these foods are to be received by humans in the body, if there is no good shelf life, more balanced experimental results. If they don't have a good shelf life for these foods, this will undoubtedly give us a food safety. <>

Second, through the guinea pig.

Conduct experiments. Secondly, people have also found through some experiments that the use of mice to eat food, ** mice react to them, so that you can see the food, his shelf life and how much time he spoils in the air. This makes it possible to figure out how much preservatives one should add to it, which is also a control variable for general experiments.

and the theoretical results obtained. <>

3. Pass food preservatives.

Look at its ingredients. Finally, this is the method that is now used by adding food additives.

In the reaction with oxygen in the air, look at the time of occurrence of the two and compare the food without the addition of food additives. Thus deriving how much of it can keep food for how long is a comparison method.

The shelf life of an item is calculated based on the time from the birth of the item to the time it begins to deteriorate, and the item within the shelf life is harmless to the human body.

The best period for the use of substances in the shelf life, the enterprise is responsible for the quality of the product during the shelf life, but the shelf life is not the only criterion for whether the substance can be used, and it may deteriorate in the process of transportation or storage.

It is mainly calculated according to the technical shelf life and the market shelf life, the technical shelf life is calculated according to the production conditions of the product, and the market shelf life is calculated according to all aspects of the market and the shelf life of the same series of products.

The first is to refer to the relevant standards of the country. It is determined according to the shelf life and logistics of similar products. The second is determined according to the production standards of the enterprise. The date is determined based on the experiments carried out on the development of the product.

The expiration date is a legal concept, which is the limit of the manufacturer's responsibility for food safety by law, that is, within this period, they will be responsible for the quality of the food, and all manufacturers will set the shelf life according to the characteristics of their products.

The calculation method of the shelf life is generally from the date of production to the most effective day of product quality assurance, and the shelf life period will be clearly marked on the product, so there is no need for personal calculation, only need to pay attention to its clear date, you can achieve the ideal degree of use.

For example, the production period 2020 08 08, the expiration date.

1 year, filling sealed. Then opening the can at 2021 08 07 is the last day of the shelf life, and 2021 08 08 is considered an expired product. According to the national standard GB7718-2011, pre-packaged food.

The period of shelf life of quality under the storage conditions specified on the label. During this period, the product is fully merchantable and retains the characteristic qualities that need not be stated or have been stated in the label.

For example, the production period is 2020 08 08, the shelf life is 1 year, and the filling is sealed. Then opening the can at 2021 08 07 is the last day of the shelf life, and 2021 08 08 is considered an expired product. According to the national standard GB7718-2011, the period of shelf life and quality of prepackaged food under the storage conditions specified on the label.

During this period, the product is fully merchantable and retains the characteristic qualities that need not be stated or have been stated in the label.

There are two main types of descriptions of the shelf life on the bag:

Use before date: There is a high chance of spoilage beyond the expiration date, so it is best not to eat it, such as fresh milk, sandwiches, etc.

Best before date: It is not fresh after the expiration date, but it does not necessarily go bad, such as flour and potato chips.

Coke, etc. Note: The shelf life is not the only criterion to identify whether a product such as food has gone bad, and it may deteriorate due to changes in storage methods, environment, etc. Therefore, try to eat food and other foods in time before the expiration date. The shelf life of food will be shortened when the bag is opened.

(1) The shelf life can actually be calculated in two ways, one is calculated according to the day of its production date, which is mainly food and some items that begin to deteriorate when they are produced, and the shelf life of these items is one year according to the day of the production date.

2) Another kind of shelf life is to calculate the shelf life of use, and the shelf life of this kind of item refers to the shelf life of its use, so it is calculated according to the day of use.

Hello, the shelf life is to look at the production date first, and then look at the shelf life, if it is less than 12 months, use the production date plus the shelf life, such as 21 days, depending on whether there is a 31st in the current month, if there is, for example, today is the 22nd, then after 9 days is the end of the month.

After 21 days, 9 days have passed, and there are 12 days, and the expiration date is the 12th of the next month, and if it is more than 12 months, such as 18 months, use the production date plus one year plus six months.

The shelf life of food products is determined by both the provisions of the Pharmacopoeia and laboratory data. In general, the multiplied factor is the shelf life of the food based on the number of days it starts to become unpalatable.

The shelf life of the product should be calculated from the date of delivery.

Hello, consult a lawyer at your service.

Just read the instructions.

The warranty period is five years. The second point of Article 7 of the Measures for the Quality Warranty of Housing Construction Projects clarifies the developer's liability for waterproofing: The warranty period for the leakage prevention of roof waterproofing projects, toilets with waterproof requirements, rooms and external walls is five years.

Regulations on the Quality Management of Construction Projects》 Article 40 Under normal use conditions, the minimum warranty period of construction projects is: (1) infrastructure projects, foundation works and main structure projects of housing construction, and the reasonable service life of the project specified in the design documents; (2) Leakage prevention of roof waterproofing projects, toilets, rooms and external walls with waterproof requirements for 5 years; (3) Heating and cooling system, which is two heating periods and cooling periods; (4) Installation and decoration of electrical pipelines, water supply and drainage pipelines, and equipment shall be 2 years. The warranty period for other items shall be agreed between the employer and the contractor.

The warranty period of the construction project shall be calculated from the date of acceptance of the completion of the project. Article 41 If a quality problem occurs within the scope and duration of the warranty of the construction project, the construction unit shall perform the warranty obligation and bear the liability for compensation for the losses caused.

Provisions on the three-guarantee period of electronic products: 1. "7 days" stipulates that within 7 days from the date of sale, if the product fails in performance, consumers can choose to return, exchange or repair.

2."15 days" stipulates: within 5 days from the date of sale, if the product has a performance failure, the consumer can choose to replace or repair the product.

3.The "validity period of the three guarantees" stipulates that the validity period of the "three guarantees" is calculated from the date of issuance of the invoice.

In the first batch of L8 commodities released by the state to implement the "three guarantees", such as color TVs, watches, etc., the "three guarantees" validity period, the whole machine is divided into six months to one year, and the main components are one to three years. If the product is repaired twice within the validity period of the "Three Guarantees" and still cannot be used normally, the consumer can replace the product with the same model and specification or return it according to the relevant provisions with the repair record and certificate, and the validity period of the "Three Guarantees" shall be deducted from the time occupied by the repair and no spare parts to be repaired. The validity period of the "three guarantees" after the exchange will be recalculated from the date of exchange.

4."90 days" and "30 days" provisions: within the validity period of the "three guarantees", because the manufacturer has not made the best spare parts, more than 90 days from the date of repair has not been repaired, the repairer shall indicate in the repair status, and the seller will exchange the same model and specification of the product for the consumer free of charge.

If the repairer repairs for more than 30 days due to its own reasons, it shall exchange the product of the same model and specification for the consumer free of charge, and the cost shall be borne by the repairer. 5.30 days" and "5 years" provisions:

The repairer shall ensure that the repaired product can be used normally for more than 30 days, and the manufacturer shall ensure that the spare parts that meet the technical requirements will continue to be provided within 5 years after the product is discontinued.

How many years to how many years to count.

The shelf life can be calculated from the date of manufacture when the day of the tent or from the day after the date of manufacture.

1. Calculated from the date of production.

Example: production date 6 9, shelf life 25 days. The expiration date of the shelf life is 7 3.

2. One is calculated from the second day of the production date.

Example: production date 6 9, shelf life 25 days. The expiration date of the shelf life is 7 4.

The national food authorities have made the following provisions on the shelf life of some foods:

1. Alcohol. The shelf life of bottled ordinary cooked beer is 2 months, and the shelf life of special beer is 4 months; Bottled grape fruit wine for half a year.

2. Beverages.

Fruit juice soda, fruit soda, cola soda, shelf life is 3 months in glass bottles and 6 months in cans; Bottle of rolling juice in glass for 6 months.

3. Canned food.

The shelf life of canned and glass bottles of fish, meat and poultry is 2 years; 15 months for canned fruits and vegetables and glass bottles; The shelf life of fried dried fruits, tomato paste, canned and glass bottles is 1 year; Milk powder is 1 year in tinplate cans, 9 months in glass bottles, and 4 months in 500g plastic bags.

4. Sugar.

Biscuits are packed in tinplate barrels for 3 months, plastic bags for 2 months, and bulk for 1 month; The shelf life of chocolate and praline chocolate is 3 months, 6 months for pure chocolate and 1 month for bulk; Condiments: soy sauce and vinegar for 6 months. <>

The expiration date algorithm is the expiration date of the shelf life of the date of manufacture.

To put it simply, the month of the production date of the product plus the expiration date, if the amount of income exceeds 12, it needs to be subtracted from 12 and included in the month of the next year. If the shelf life is directly stated on the packaging until a certain year and a certain month, it means that it can be used until a certain year and a certain month, and after this date, it can no longer be used.

For example, if a cookie with a shelf life of 6 months and a production date of January 1, 2020, the expiration time is equal to January 1, 2020 plus 6 months, then the expiration date is July 1, 2020.

Methods and precautions for storing products

First of all, products with a short shelf life need to be stored separately from other surplus products, such as yogurt, fruit, eggs, etc.

Secondly, it is necessary to choose the corresponding preservation method according to the product, for example, beverages should be stored in an airtight manner, vegetables should be stored fresh, and meat should be stored in a frozen manner.

Again, raw and cooked foods should be stored separately because mixing them together can breed bacteria and shorten their shelf life. Refrigerated or frozen foods should be reheated before consumption.

Finally, it is suitable to store the product in a cool, dry, and dark environment, and do not place it in a place with high temperature. If the product is stored by dehydration, exposure to the sun, etc., it should be stored in a dry environment to avoid moisture regain.

A few days ago, my friend broke up with his girlfriend who had been in love for more than 5 years, I asked the reason, and the two of them said one, and they were not the same, the boy said that the two of them had too much opinion of each other together, and the girl said that she couldn't see the future with him. In general, both of them have already had opinions about each other, and their minds have begun to split into two roads, the end of the world and the cape, and the distance between the two roads is getting farther and farther.

At the time of this incident, I thought of a word, the seven-year itch, and they came to the moment of the 'seven-year itch' in advance, and unfortunately, they were defeated at the feet of the "seven-year itch", and they were unable to get through this extraordinary period of time, and finally broke up and went their separate ways.

In fact, I feel very sorry for the breakup of my friends, after all, like him, when he broke up in junior high school in the morning and found another one in the afternoon, looking for a girlfriend is like eating, he can last for more than five years, which is already a great thing, but this time his relationship may end because the shelf life has passed.

Does everything have an expiration date? I think so, but there are some things that can be thrown away after the expiration date, and some things that cannot be thrown away.

Either way, I still hope that my friend and his ex-girlfriend will be okay.

The past is still the same, just for the present.