Glass jar is often an essential for any kitchen cupboard. It can be used to preserve or store items as diverse as jam, pickled, marmalade, oil, home brewing, sundried tomatoes, olives, chutneys, honey, and many others. They are also frequently re-used in order to put home-made preserves in. For industries, glass jars are used for foods, beverages, cosmetics, medications, and chemicals that are relatively thick or viscous: pourable liquids.
Glass Jar is chosen for its attractiveness, low cost, and a practical way to keep and display any household items, while its construction keeps contents fresh. Also, it can be sterilized only by putting it in boiling water, an oven, or microwave for few minutes.
The demand of wholesale glass jar market is quite high. Typically, they are produced in a factory using an automated process, however, it can be created at your home.
Basically, there are two main steps of making glass jars. The first involves molding the molten glass using an iron mold and air. The second involves reheating and cooling the glass.
Besides of the process, shape and sizes, the unique thing of the glass jars are on its closures (caps or lids), a stopper which fits inside the neck of the glass jar to make seal. Some of the options are:
- Cork or cork stopper. It is the most common closure, particularly for wine products.
- External and internal threaded screw cap.
- Combination metal and cork, like sprinkler, squirt and tube tops. Typically, sprinkler top does not need to be removed from the bottle in order to use the contents; the contents were dispensed through the opening
- Rubber, wood, paper, wax, corn cobs, and other materials were occasionally used as general closures on bottle,
- The crown cap closure that made from simple metal cap