PET bottle is a kind of functional resin. It is a kind of packaging bottle formed by 100 % PET. It is usually used for packaging materials such as fruit juice, tea and carbonated beverage. It can be said that it has the same function as paper packaging and is active in the packaging field.
The history of PET as a packaging material is still very new. It was first used around the 1970 s, but by the end of the 20 th century, its use had reached hundreds of thousands of times. In particular, the rapid development in the past two or three decades shows the rationality of its existence. It can be seen from the analysis of the characteristics of this PET material :
( 1 ) Its transparency and luster can be comparable to that of glass. At the same time, this material can be colored and printed directly on it.
( 2 ) It is very light and can withstand impact. If it is made into a very large container, its own weight does not change much and is not fragile.
( 3 ) It has a very high interruption of contact with the air.
( 4 ) Its heat resistance can reach more than 90 degrees, so the beverage packaged with it can be insulated.
( 5 ) Since it is 100 % PET, there is no separation phenomenon in the material. From this point of view, it can strictly guarantee the hygiene of food.
( 6 ) It also has the ability to resist the ingredients of the drug.
( 7 ) when burning, it only decomposes diacidified carbon or decomposes in water without producing harmful gases ; its heat is basically the same as paper and wood, and there is no damage to the furnace during the melting process. Therefore, this material is very suitable for packaging.
Packaging materials with so many advantages, why not be used earlier ? This is because the development and utilization of this material, is to go through many times of improvement and technological innovation, the process is the need for multiple inspection and testing. When the product technology is successful, it can enter the market and be recognized and used by people. Finally, it has created a mature market for the current PET bottle, in which the environment and demand are indispensable.
It can be seen from the market demand of PET bottles that it was mainly manifested in the 1980 s when household refrigerators were popularized, which was inseparable from the particularly strong demand for 1.5 liters of juice at that time. From the perspective of its historical development process, its most developed time is also the most popular period of family refrigerators. This coincidence also shows the maturity of materials and market needs, which is the result of simultaneous development. At the same time, the extensive use of PET bottles can also be said to symbolize the improvement of people 's lives.
Although many goods are bottles made of PET materials, we may also feel that the shape is completely different. For example, the bottom shape of Cola 's PET bottle is like a foot, which can also be called a petal-shaped bottle bottom. Here is not to design from the aesthetic aspects of the shape, which contains a functional needs.
Because there is a pressure in the bottle of carbonated beverage, in order to make the bottom surface not easy to break, this kind of modeling is especially used. Carbonated drinks used PET bottles around 1983.At the beginning, it was not the current shape. In order to be safe and stable, the designer added other materials to its bottom, and then after the study of the shape, it became the current structure.
As the use of juice drinks, the bottle shape has a concave surface on its side. This is because the juice drinks need to be heated and sterilized during processing. This bottle shape plays a key role in preventing shrinkage when the temperature is reduced.
In the processing of the PET bottle door part, because the bottle mouth part is stronger and more durable than other parts, more PET is mainly injected into the bottle mouth part to make it stronger.
Although juice PET bottles and cola PET bottles are the same material, but this contains a lot of technical achievements.
There is also a sterile PET bottle, which is not particularly different from other bottle shapes, but only meets its special requirements when injecting different beverages. PET bottles of mineral water require a sterile state when they are injected, that is, they do not come into contact with the outside world. For example, tea and dairy drinks that are very perishable use this sterile PET bottle.
Now for the development of PET bottles, researchers are still in progress, and there are many lighter and thinner bottles than now. Its research on convenient recycling is also an important research topic at present, now in lotions, oils, cosmetics. In the packaging of pharmaceuticals, we can also see examples of the use of PET as a packaging material.
