Why does milk with a shelf life expire?

The purchased fresh milk, although it is still within the shelf life and has been refrigerated after purchase, is found to have deteriorated when eaten.
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Have you ever encountered such a situation? So what is the reason for this situation? Let me take you to find out
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The domestic dairy industry is improving as a whole.
The "2020 China Dairy Industry Quality Report" released in October 2020 shows that the domestic dairy industry pays close attention to quality at the source.
Although the number of fresh milk colonies in the new national standard is 20 times higher than that of Europe and the United States, the results show that The total number of colonies and the average value of somatic cell sampling are better than the EU standards, which is a great progress of the Chinese dairy industry! When domestic dairy companies with advanced equipment mention domestic milk production equipment, ordinary people will have the stereotype that they lag behind foreign countries, but in fact, since melamine in 2008 After the incident, the Chinese people are paying more and more attention to the quality of dairy products, and domestic dairy companies have also come to their senses.
Most of the newly built dairy production lines have imported equipment from abroad
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Domestic dairy companies have also deployed this technology and launched their own ultra-filtered milk
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As early as September 2021, Coca-Cola and Mengniu's joint venture "Keniu" introduced the fairlife ultra-filtered milk "Xianfeile" into the Chinese market
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In January this year, Yili also launched the ultra-filtered milk product Jindian "Super 6"
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Several major companies entered the game at the same time, making "ultrafiltered milk" and the technology behind it a new competition point in the domestic dairy market
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The milk source is high-quality and the equipment is advanced.
Now is a good era for the development of domestic dairy enterprises.
It goes hand in hand with the European and American dairy industries.
Is the spoiled milk during the shelf life just a simple accident? When comparing the current situation of domestic and foreign dairy industry, Achilles' heel of dairy product safety is not only pleased with the progress of domestic dairy industry, but also found an inconspicuous but fatal blind spot of quality safety - advanced equipment, but the equipment and pipeline connection adopts Manual welding is prone to bad weld beads, which will cause secondary pollution in the production process
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At present, the foreign dairy industry widely adopts the American 3-A sanitation standard and the European Hygienic Engineering Design Organization standard (EHEDG for short).
These standards have very strict requirements for clean piping systems.
Pipe connections are to be automatically welded to reduce the risk of dairy contamination
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But unfortunately, although GMP (Good Manufacturing practice for milk products, Good Manufacturing Practice for Dairy Products) puts forward strict requirements on the materials and design of clean pipelines, the Chinese dairy industry still has a lot of stress due to factors such as labor costs and industry inertia.
Equipment, light pipeline phenomenon
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Although advanced equipment is introduced when building or expanding production lines, traditional manual welding and installation are still widely used
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The manual welding method is greatly affected by human factors.
The skill level of each welder is different, and the weld bead is uneven.
Any bad weld bead is a place for microorganisms, internal and external toxins, and heat-resistant enzymes to remain and multiply
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The main reason for the deterioration of milk is a series of chemical reactions caused by the reproduction of microorganisms, endotoxins or heat-resistant enzymes produced by microorganisms, which make various components and physical and chemical properties of milk change
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In the production, storage, processing, transportation and other links of milk, the number of colonies exceeds the standard or the residue of heat-resistant enzymes, thus shortening the shelf life
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The main reason why the number of domestic milk colonies exceeds the standard - the poor welding bead of manual welding on the production line hides dirt! After CIP cleaning, due to the depression or protrusion of the manual weld bead, the cleaning solution cannot be self-drained in the pipeline, and the milk scale remains in the pipeline.
There are about 30,000 weld beads on the production line of a large-scale dairy enterprise.
If manual welding is used, it is unavoidable There will be a lot of bad weld beads that can be the Achilles' heel of dairy safety! When the heat-resistant enzyme falls off in the welding seam and is filled into a package of milk, it will deteriorate during the shelf life, but it is difficult to detect when it leaves the factory, so it is sold as a qualified product.
event that is bound to happen
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Magnetic filter Bad weld bead will not only leave all kinds of dirt, but also shed a lot of iron filings due to oxidation
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A multinational dairy company's newly built production line in China is plagued by iron filings impurities
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It is often necessary to stop production for sterilization and cleaning, and the intervals are getting shorter and shorter
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After recruiting the engineering company to test the whole line, it was concluded that the culprit was those bad welds, either re-laying the pipeline and using automatic welding, or strengthening the concentration of the cleaning solution and increasing the cleaning frequency
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Dairy companies are caught in a dilemma between quality control and reconstruction costs, and are struggling to cope with the endless quality anomalies
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The situation was alleviated after the installation of Kinglai magnetic filters
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However, all kinds of dirt, heat-resistant enzymes, and internal and external toxins remaining in the weld bead cannot be effectively solved
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Automatic welding of magnetic rods that absorb a large amount of iron filings removes quality blind spots for dairy enterprises.
Automatic welding eliminates human factors, and there will be no defects such as welding bead dislocation, depression, non-penetration, and internal and external protrusions, and will not cause materials, CIP cleaning fluid, microorganisms, etc.
Residual manual pass VS automatic pass rame src="https://" width="100%" height="100%" frameborder="1 ">rame> Automatic welding video automatic welding technology clears the quality blind spot for dairy enterprises.
Kinglai Group is willing to join hands with domestic dairy enterprises to promote automatic welding technology
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Provide consumers with high-quality domestic assured milk; extend the shelf life for dairy enterprises, reduce the frequency of CIP cleaning, reduce production costs, eliminate waste, and jointly promote food safety progress! (The pictures of the article are provided by Jinlai Group) window.
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