For a moment, I regretted giving birth to him. The older the children are, the more I feel illiterate.
So, I summed up the complete answer to this question, hoping that you can become a heroic mother who knows everything in your child's heart.
1. Why is milk packed in a square box?
In terms of manufacturing materials, most milk cartons are packed with tetra pak bricks. tetra pak bricks are one of Tetra Pak's patented packaging in Sweden and one of the most popular dairy and beverage packaging in the world. For example, Deyun Society and Australian Animal Husbandry imported children's milk, and Anjia adopted tetra pak.
The storage of milk mainly considers sterilization. Tetra pak brick is a six-layer composite paper bag composed of paper, aluminum and plastic, which can effectively block air and light and prevent milk from spoiling. Therefore, small tetra pak bricks can extend the shelf life of milk to several months or even a year, and achieve high packaging efficiency.
Because of its fiber structure, paper is easy to fold, and it is mostly square when made into containers, but it is difficult to process it into a circle.
As far as storage space is concerned, Professor robert frank, the author of "Economics of Milk Cola", thinks that considering the cost-benefit analysis, square boxes can make more effective use of storage space and save shelf costs.
Some milk needs to be refrigerated in the refrigerator, otherwise it will go bad soon. The storage space of the freezer is very precious, and the square boxes can use the space more effectively when stacked.
2. Why is the soda in the round bottle?
We can see in the market that almost all soft drinks, whether plastic bottles, glass bottles or aluminum cans, are cylindrical. Why?
In fact, soda contains carbon dioxide, so it needs a container that can withstand a certain pressure. Circular plastic bottles or aluminum cans are more conducive to withstanding the pressure inside. If soda is filled in a square carton, the four sides of the carton will swell due to the increase of air pressure, which will lead to the appearance deformation, affect the appearance, and even cause an explosion due to excessive pressure.
Because people are used to drinking soda in containers, cylindrical containers are more convenient to use and offset the extra storage cost, so soda is usually packed in round bottles!
Ok, that's all for today's milk knowledge. Ma Bao quickly took her children to the supermarket!