The development process and recycling of daily glass bottles

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In the cosmetics industry, it is based on raw materials such as quartz sand/limestone, barium sulfate, boric acid, borax, and lead compounds, combined with auxiliary materials such as clarifiers, colorants, decolorants, opacifiers, etc., through drawing and blowing processes Processed packaging products. We call it a glass container, or glass bottle for short.

 

In the development of mankind, glass has a long history. For us, glass is one of the most incredible and useful materials. It has been used in every field of mankind, from industrial applications to home decoration; from solar energy to the most basic doors and windows, such as home doors and windows, church doors and windows ; From beer bottles for tasting beer to perfume bottles for enjoying fresh and scented perfume, to medical safety infusion bottles for treating humans.

 

Let us understand the development history of the next glass bottle!

 

The history of glass containers

Container glass, including bottles, cans, drinking utensils, and bowls, etc. This type of glass is different from flat glass (used for windows, glass doors, transparent walls, windshields) and fiberglass (used for heat preservation, glass fiber composite Materials and optical communications).

 glass bottles

Compared to flat glass, container glass has a lower content of magnesium oxide and sodium oxide, but a higher content of silica, calcium oxide, and aluminum oxide. Its higher content of water-insoluble oxides gives it higher chemical durability, which is very important for water and food storage. Most of the container glass is soda lime glass, which is manufactured by pressing in a mold, while other laboratory glassware is made of borosilicate glass.

 

The history of glass manufacturing can be traced back to Mesopotamia in 3500 BC. Archaeological evidence indicates that the first real glass was made on the coast of northern Syria, Mesopotamia or ancient Egypt. The earliest known glass objects come from two millennia BC. They may be accidental by-products of metal processing (slag) or by-products of the production of colored porcelain. The earliest glassy materials were made by similar methods.

 

In Chinese history, glass is similar to handicrafts. The fact that glass objects are rarely found in archaeology also indicates that they are very rare in ancient China. From literature, we know that ancient Chinese glass originated in the 5th century AD.

 

However, for glass production, the earliest archaeological evidence in China comes from the Zhou Dynasty (1046 BC to 221 BC).

 

The diversification of the use of glass began in the Han Dynasty (206 BC to 220 AD). During this period, glass mold casting technology was introduced. The chemical composition of Chinese glass varies greatly from the Warring States Period to the Han Dynasty. The glass of this period contains high content of barium oxide (BaO) and lead, while West Asia and Mesopotamia belong to soda lime silica glass.

 

At the end of the Han Dynasty (220 AD), the production of lead barium glass declined, and glass production resumed in the fourth and fifth centuries.

 

Glass bottle molding process

The forming process of glass bottles and cans refers to a series of action combinations (including mechanical, electronic control, etc.), repeated in a given programming sequence, and the goal is to produce a bottle and can with the desired specific shape.

 

At present, there are two main processes in the production of glass bottles and cans: the blowing method for narrow and small bottle mouths and the pressure blowing method for bottles and cans with larger diameters.

 

In these two forming processes, the molten glass liquid, at its material temperature (1,050-1,200°C), is cut by a shear blade to form cylindrical glass droplets, called "gobs". The weight is enough to produce a bottle. Both processes start from shearing the glass liquid, drop the material under the action of gravity, and pass through the trough and turning trough, into the prototype, and then the prototype is closed tightly and from the top The "bulk head" is sealed.

 

In our daily lives, glass bottles can be seen everywhere. Whether it is beverages, medicines, cosmetics, etc., glass bottles are their good partners. These glass bottles have always been regarded as the best packaging materials because of their transparent beauty, good chemical stability, no pollution to the contents, high temperature heating, and old bottles that can be recycled and reused.

 

Recycling of glass bottles

The recycling volume of glass bottles is increasing every year, but this recycling quantity is huge and immeasurable.

 

According to the Glass Packaging Association: The energy saved by recycling a glass bottle can make a 100-watt light bulb light up for about 4 hours, run a computer for 30 minutes, and watch 20 minutes of TV programs. Therefore, recycling glass is A matter of great significance.

 

Glass bottle recycling saves energy and reduces the waste capacity of landfills, which can provide more raw materials for other products, including glass bottles of course. According to the National Consumer Plastic Bottle Report of the US Chemical Products Council, approximately 2.5 billion pounds of plastic bottles were recycled in 2009, with a recycling rate of only 28%.