Home Blog How Glass Water Bottles Are Made?

How Glass Water Bottles Are Made?

5:25 pm | Blog


We often use various types of glass products in our daily lives. Because glass products are both beautiful and practical, they can be loved by virtue of their crystal-clear appearance, but also make full use of their hard and durable physical properties. Some art glass will even make the glass with more patterns to enhance the decorative effect. In this article, NoWest (water bottle manufacturer) will introduce glass water bottle manufacturing process.

Clear Glass or Frosted White Sublimation


1. Glass Brief Introduction

2. Glass Characteristics

3.Glass Water Bottle Manufacturing Process 

  • Batching
  •  Melting
  •  Forming
  • Annealing
  • Inspection

4. Conclusion

Glass Brief Introduction

Glass is an amorphous inorganic non-metallic material, generally made of a variety of inorganic minerals (such as quartz sand, borax, boric acid, barite, barium carbonate, limestone, feldspar, soda ash, etc.) as the main raw material, plus a small amount of auxiliary raw materials.

Its main components are silicon dioxide and other oxides. The chemical composition of ordinary glass is Na2SiO3, CaSiO3, SiO2 or Na2O-CaO-6SiO2, etc. The main component is silicate compound salt, which is an amorphous solid with an irregular structure.

Glass Characteristics

◎ Transparent, hard, good chemical stability.

◎The physical and chemical properties of the glass can be substantially adjusted by the adjustment of chemical composition to suit a variety of different usage requirements.

◎It can be made by various forming methods such as blowing, pressing, drawing, casting, groove sinking, centrifugal pouring, etc.

◎Hollow and solid products of various shapes can be produced.

◎Complex shapes and tight dimensions can be produced by welding and powder sintering.

◎The raw materials for glass manufacturing are abundant.

◎Glass is a renewable and environmentally friendly material.

Glass Water Bottle Manufacturing Process 

  • Batching

The main raw materials of glass are quartz sand, limestone, feldspar, soda ash, boric acid, etc. According to the design of the material list, the various raw materials will be weighed and mixed in a mixer.

  • Melting

The matched raw materials are heated in the kiln at high temperatures (1550~1600 degrees) to form a uniform, bubble-free, and liquid glass that meets the molding requirements.

The melting of glass is carried out in the kiln. There are two major types of kilns: crucible kilns and pool kilns.

1)Crucible kilns

The glass material is held in a crucible and heated outside the crucible. Smaller crucible kilns contain only one crucible, while larger ones can have up to 20 crucibles. Crucible kilns are interstitially produced, and now Only optical glass and color glass are produced in crucible kilns.

2)Pool kilns

The glass material is melted in the kiln pool, and the open flame is heated in the upper part of the glass liquid. Glass melting Most of the glass melting temperature is 1300 ~ 1600 ° C. For most of the flame heating, there are also a small number of With a small number of electric heating, known as electric fusion kiln. Now, the pool kiln is continuous production, the Small kilns can be a few meters, and large ones can be as large as more than 400 meters.

  • Forming

Forming is the transformation of the melted glass liquid into a solid product with a fixed shape. It must be done at a certain temperature range, which is a cooling process. The glass is first transformed from a viscous liquid state to a plastic state, and then into a brittle solid.

There are two major types of forming methods: manual blowing and machine pressing.

1)Manual Blowing

Use a stainless steel hollow tube to pick the right amount of high-temperature molten glass water, like blowing a balloon first blow into a sphere, then put it into the pre-prepared mold and continue to blow into the shape of the mold fit. Then the mold is opened and the glass is clamped into the annealing furnace to remove the stress of the glass, and then cut, ground, mounted (feet or handles), polished, and the finished glass.

2)Machine pressing

The same principle as manual, but from human blowing into bubble blowing machine to blow. Pressing glass machine like a revolver, the mold is fixed one by one on the turntable, the turntable a general circle of 8 or 10 molds, hanging above a punch is fixed, through a barrel of glass water into the mold, and then turn to the punch below the punch down the glass pressed into shape, and then manually remove the glass into the annealing furnace to complete the finished glass.

  • Annealing

Glass undergoes intense temperature changes and shape changes during the forming process, which leaves thermal stresses in the glass. This thermal stress can reduce the strength and thermal stability of the glass product. If directly cooled, it is likely to break on its own during the cooling process or later during storage, transportation, and use (commonly known as the cold burst of glass). In order to eliminate the cold burst phenomenon, glass products must be annealed after forming. Annealing is a temperature range in certain temperature insulation or slow cooling for a period of time to eliminate or reduce the thermal stress in the glass to allow the value.

  • Inspection

All glass containers are checked for any foreign contamination in the glass and for air bubbles in the glass. Both automatic and manual inspections are performed. Inspections include the size of the product, the shape of the product, cracks, pinholes, contamination in the bottle, and air in the bottle. These inspections are done on a continuous conveyor belt through which the bottles pass, with multiple inspectors checking for these defects. Once sorting is complete, the good products are sent to the next stage for packaging. Defective bottles are sent to a recycling station and used as crushed stone in the batch composition.

In addition, all defects are recorded for feedback to the production department to reduce defects.


The above is the manufacturing process of glass, I do hope it can provide some help to you! From the glass production process, we clearly learn that glass is a very environmentally friendly material. So in terms of environmental considerations, we should choose glass water bottles instead of plastic water bottles as much as possible!