How Glass Bottles Are Made

facility is located in a growing region of Xuzhou, China, and manufactures more than 400,000 glass bottles per day. Based on the modern bottling factory​ and experienced know-how team, our bottle production is intended for the premium end of the beverage, food and cosmetic industry.The manufacturing of glass bottles comprises a number of stages. They include crushing and mixing of raw materials, batching, melting, pormation processes, annealing. The manner in which these steps are performed may be adjusted depending on the glass bottle product.

Full Capacity in Our Glass Bottle Manufacturing Plant

  • 5000+

    - Instock styles -

    the foremost advantage of stocking a huge amount of molds in-house is the flexibility. One factory can hardly meet all your requirements.

  • 700,000+

    - Pcs of bottles daily -

    React to market quickly. Our bulk production allows businesses to move through production phases quickly and easily.

  • 8

    - Production lines -

    Lower cost when producing in low volumes. Roetell's production lines function diverse bottle production simultaneously.

How to Make Glass Bottles Step by Step

#1 Raw Materials For Making Glass Bottles

Raw materials that we primarily use in the manufacture of glass bottles are sand, soda ash, limestone and cullet.These materials are mixed in a specific ratio to make soda lime glass. Other types of glass bottles may, however, require additional inputs. For instance, dyes and chemical compounds may be added in the manufacturing process to produce colored bottles or heat-resistant borosilicate glass.

  • Glass containers raw materials sand Sand
  • Glass containers raw materials soda ash Soda ash
  • Glass containers raw materials limestone Limestone
  • Glass containers raw materials cullet Cullet

#2 Batching Process for Making Glass Bottles

Once the raw materials are gathered and prepared, they are placed in a hopper machine for mixing. The mixture is then put into batching compartments in measured portions. It is from these compartments that it is fed into the melting furnace through a conveyor belt.

Batching is an important phase of glass bottle manufacturing. The mixture portions have to be accurate to ensure consistent quality. Their sizes are determined by the design and the number of bottles to be made.

Glass containers batching process

#3 Glass melting during bottle production process

The melting phase takes place in a heating furnace where the raw materials are subjected to high temperatures of about 1600°C. The water content evaporates and organic matter is burned off while the remainder of the mixture melts to form molten glass. Finally, the molten glass is cooled to achieve viscosity in readiness for the formation stage.

All our furnaces are fully automated. Their temperatures settings are controlled by our engineers from an integrated control room using special software.

Glass containers melting process

#4 Blow glass forming processes

Glass formation involves the molding of molten glass into the desired bottle shapes. First, the viscous mixture is cut into gobs of equal size using a timed blade. The gobs fall into separate slots of an individual section machine. Each slot contains a shaping mold.

The final shape is achieved by either Blow and blow method or Press and blow method.

Blow and Blow Process

In the Blow and Blow method, compressed air is used to shape the bottle. It is blown onto the molten gob and pushes it to take the shape of the mold. This initial shape is referred to as a parison.The parison is then flipped to an upright position, reheated and injected with more air to fully define its shape.

This method is used for narrow glass bottles such as beer glass bottles​ , wine glass bottles​or soda glass bottles​.

Glass containers blow and blow gob dropped into black mold Gob dropped into black mold
Glass containers blow and blow neck formed Neck formed
Glass containers blow and blow process blank blown Blank blown
Glass containers blow and blow blank shape Blank shape
Glass containers blow and blow blank transferred to blow mold Blank transferred to blow mold
Glass containers blow and blowfinal shape blown Final shape blown
Glass containers blow and blow finished bottle Finished bottle
Press and Blow Process

The Press and Blow method involves the use of both a plunger and air to shape bottles. When the molten gob falls into the individual section, a plunger pushes it to fit the mold. This action defines it into a parison which is then transferred to a blow mold. There, it is reheated and blown with air until it is properly shaped.

This method is preferred for wide-mouth glass containers such as glass vases​, glass candle jars​ or milk bottles​.

Glass containers press and blow gob dropped into black mold Gob dropped into black mold
Glass containers press and blow plunger presses blank shape Plunger presses blank shape
Glass containers press and blow blank pressed Blank pressed
Glass containers press and blow blank shape Blank shape
Glass containers press and blow blank transferred to blow mold Blank transferred to blow mold
Glass containers press and blow final shape blown Final shape blown
Glass containers press and blow finished jar Finished jar

#5 Annealing and Conditioning Processes in Glass Bottle Manufacturing

After the rigorous process of formation, the glass bottles are allowed to cool before being moved into an Annealing Lehr. It is a long kiln that has controlled temperature settings. In it, the glass bottles are slowly reheated and then gradually cooled again to a temperature below the strain point of glass.

Annealing is important as it minimizes the internal stresses in the glass bottles that can lead to shattering. It also ensures an even settling of the glass material.

We control the annealing process to:

  • Ensure the consistency of material
  • Minimize stresses
  • Prevent spontaneous breakage
Glass containers annealing

#6. Surface Treatment

Surface treatments are performed on the exterior of glass bottles when they are complete. They can be used for decoration, labeling and even protection against abrasion. We have specialized equipment and know-how in performing various treatments including:

Professional Glass Bottle Manufacturers From China

At Roetell, we have over 30 years of professional experience in making glass bottles. We ensure that every process is done to the highest possible standards for our client's satisfaction.

Consult Your Roetell Glass Bottles & Packaging Experts

We help you avoid the pitfalls to deliver the quality and value your glass bottle and jar need, on-time and on-budget.

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