The Materials Testing Association in America has defined glass as a mineral product obtained from the earth’s crust, i.e. a molten mixture of lime silicate and sodium carbonate, hard and without crystals, because the atoms and molecules in glass have an irregular and random distribution.
They cannot be crystallized. Considering that heat is very important in the food industry, glass is thermally stable, suitable for pasteurizing, sterilizing and hot filling.
Peanut butter jar containers allow to be used for pasteurizing materials for cold and hot filling subject to compliance Taking the void volume into account and taking thermal shock into account, filling products hot at 85°C and then cooling requires 5% void space, while filling a cold product to be sterilized at 121°C Grad needs 6% free space.
Glass containers are reversible and reusable and recyclable, and weight savings have been created by technical advances in design.
The final and critical aspect is to close the lid, the lids of glass containers include lids, lids, corks, glass lids.
Glass lids are no longer common nowadays, and lids that are opened by twisting are used mainly.
They are opened by the twisting action, which maintains the air pressure inside the soda bottles and the vacuum by means of plastic washers and metal springs.
Improper design of doors for glass containers negates the advantages of glass packaging.
Resistant to heat: after being made, all glass containers are heated at a temperature close to melting (570-540 degrees Celsius), for this reason, these containers are resistant to pasteurization, sterilization, and even thermal shocks.
Strength: Glass containers are very strong against pressure and like an elastic material, they absorb some of the incoming energy.
Although the design plays an important role in the resistance of these containers.
Possibility of re-use: the lid of glass containers can be opened and closed easily and can be used to store unused contents again.
Color: Glass containers are available in different shapes, sizes and colors.
Most of the glass containers are made colorless and transparent, but due to the necessity of using color in cases such as packaging of milk, beer or colorless soft drinks, the color of the glass can be simply green, amber, milky, brown.
And other colors also changed.
Convenient packaging: Glass containers are easy to fill.
Food packaged in glass has a longer life and has a higher storage capacity.