The concept of milk

Milk is one of the oldest natural drinks, known as "white blood", and its importance to human body can be imagined. As the name implies, milk is squeezed from cows, and different countries have different grades of milk.

Analysis of Nutritional Components of Milk

Milk is rich in minerals, calcium, phosphorus, iron, zinc, copper, manganese and molybdenum. The most rare thing is that milk is the best source of calcium for human body, and the ratio of calcium to phosphorus is very suitable, which is beneficial to the absorption of calcium. There are at least 100 complex species, and the main components are water, fat, phospholipids, protein, lactose and inorganic salts.

Types of milk

Normal temperature milk: through ultra-high temperature sterilization, all harmful bacteria can be killed, and the shelf life can be extended to 6 ~ 12 months, without refrigeration, but a lot of nutrients will be lost.

Reduced milk: Milk powder should not be used in pasteurized milk, but dairy products such as normal temperature milk and yogurt can be used, but the raw materials must be marked with "reduced milk" or "water and milk powder".

Fresh milk: In many developed countries, unsterilized fresh milk is the most popular among consumers, but it is also the most expensive. Freshly squeezed milk contains antibacterial active substances such as lysozyme, which can be stored at 4℃ for 24 ~ 36 hours. This kind of milk does not need heating, and it is not only nutritious, but also retains some trace physiological active components in milk, which is very beneficial to children's growth.

Pasteurized milk: Pasteurized milk needs to be refrigerated at 4℃ ~ 10℃ all the way, which is popular and preserves the nutrients in milk to the greatest extent. Most milk with short shelf life is pasteurized "homogeneous" milk. This method can ideally preserve the nutrients in milk, and it is one of the most advanced milk disinfection methods in the world today.

Non-resistant milk: this term has been recognized by most people, but it will not appear on the outer packaging of milk, because it is one of the indicators of milk leaving the factory, and the milk of well-known manufacturers should meet this standard.

Milk packaging

Roof box-roof box, also called fresh-keeping house, is a kind of paper-plastic composite packaging. Its roof-shaped carton is a multilayer composite film, the outermost layer of the carton is a plastic film, the middle layer is fiber, and the inner layer of the product is aluminum foil. The roof box is beautifully printed, which is generally suitable for filling high-grade products with high nutritional value and fresh taste, such as fresh milk, colored milk, yogurt and lactic acid bacteria drinks, but it needs to be stored in cold storage.

Tetrapak-Tetrapak packaging is sealed, that is, milk is poured into a paper tube and then cut and sealed, so there is no air inside. Tetra pak is a six-layer composite package composed of paper, aluminum and plastic, which can effectively isolate milk from air, light and bacteria, so it can be stored at room temperature and has a long shelf life.

Glass bottle-glass bottle is a traditional milk packaging, which has the characteristics of environmental protection, reusability and low cost. Non-toxic, odorless, transparent, beautiful, good barrier, airtight, heat-resistant, pressure-resistant and cleaning-resistant, and can be sterilized at high temperature and stored at low temperature.

Sterile plastic bag-The packaging material of sterile plastic bag is specially treated, and there is a black coating inside the plastic bag, which can isolate light. However, due to the thin aseptic plastic bag, even after special treatment, its effect of isolating light cannot be compared with that of aluminum foil, so the shelf life of milk at room temperature is about 30 days.

Bailibao-its structure is multi-layer aseptic composite film, including three layers of black and white film, five layers of high barrier film, seven layers of extruded film and aluminum-plastic composite film. According to different materials, its shelf life ranges from 30 days to 180 days. Bailibao is a new low-cost packaging form. The shelf life of milk packaged by Bailibao is generally 45 days, and the shelf life can reach 2 ~ 3 months with appropriate preservatives.

Combibloc-Combibloc is a kind of aseptic packaging, similar to Tetra Pak packaging. Kangmei packaging belongs to "open" packaging, and its dumping method is to pour directly into the carton, and the upper part of the carton is not sealed. Pour the milk first, and then the machine automatically seals the top of the carton.