Introduction to the production and processing technology of glass bottles

1. The status quo of glass bottles:

             Glass bottles can be roughly divided into soda glass, lead glass and boron glass according to their composition. According to the molding manufacturing method, it is divided into manual blowing, mechanical blowing and extrusion molding. Today, the mechanically blown soda glass is mainly introduced to everyone, because the mechanically blown soda glass is currently the most widely used high-end glass bottle. The production process of glass bottles will be used as clues to introduce relevant knowledge to everyone one by one.

2. The craftsmanship of glass bottles:

1. Melting

          Glass is mainly made of quartz sand, soda ash, limestone, feldspar, etc. as raw materials, of which quartz sand is the main component, crushed and mixed in a certain proportion, and then enters the tank kiln or tank furnace for high temperature (1550 ~ 1600 degrees) heating through conveying equipment. Make it form a uniform, bubble-free liquid glass that meets the molding requirements. The main component of quartz sand is silicon, which is also the skeleton of glass. These raw materials have also undergone strict testing when they enter the site. After passing the testing, these raw materials are prepared in a certain proportion and put into the kiln for melting.

2. Forming

            The high-temperature liquid glass in the kiln enters the bottle making machine from the feeder (bottle making machines are divided into automatic and semi-automatic). The feeder is controlled by a computer. According to the weight of the product, according to the uniform size and timing, the material is fed Give the bottle machine. Bottle making machine is the core equipment in molding. Wine bottles, oil bottles, perfume bottles, and beverage bottles are small-caliber glass bottles, which are basically blow-blow molding process. The process is as follows: charging blowing backward blowing initial inflation prototype turning positive blowing and solidification and cooling of bottles and cans clamp bottles cooling and conveying.

Fully automatic production line, production site of bottles:


           The glass bottle is cooled and transported to the annealing furnace for annealing. Annealing is used to eliminate various thermal stresses formed during the molding process of the glass bottle, stabilize the internal structure and avoid bursting. The process is that the glass bottle slowly passes through the annealing furnace, and the temperature in the furnace is controlled at around 500 degrees. If the annealing process is not done well, it will burst during transportation, filling, and equipment sales, which is a hidden danger. After the glass bottle comes out of the annealing furnace, it is the packaging inspection step.

3. Surface treatment process

             After the glass bottle is finished, according to the different needs of customers, various patterns, symbols, colors, etc. need to be added to the surface of the bottle, which requires different surface treatment processes to achieve. The commonly used processes include baking, frosting, color spraying, engraving, screen printing, electroplating, polishing and so on.

1) Decal 

         First print the pattern on the baking paper made of special materials, and then paste the printed baking paper on the glass bottle, dry it and put it in an electric heating furnace to heat and cool, the pattern will be printed The glass is on the surface, and its adhesion is very strong. The baking flowers are divided into high temperature and low temperature.

Demonstration of baking process:



2) Frosting

Frosting is to immerse the glass bottle in a solution of glass frosting powder to corrode the surface of the glass bottle and produce a hazy effect. Frosting is divided into full frosting, partial frosting, and hollow frosting.

Frosting craft show:


3) Spray color (spray picture)

          The color spraying process is also called spray drawing. It uses special glass paint, sprays it evenly on the surface of the glass bottle with a spray gun, and then performs drying treatment. Glass bottle spray color is divided into high temperature and low temperature according to the temperature. Nowadays, high temperature is rarely used due to environmental protection and energy consumption. According to the color, the glass bottle spray color is divided into transparent color and solid color (bright and matte): according to spray The parts are divided into gradient spray color and full spray color; there are also spray colors that mix and match several colors. It should be noted that multiple processes can appear on a glass bottle at the same time, not a single one.

Color spraying process display:


In addition to the several processes described above, common glass processes include electroplating and screen printing.

Electroplating process display:


Screen printing process display:



After looking at the display pictures of the above several craft effects, everyone must have a more perceptual understanding of the glass bottle craftsmanship.

4. Summary:

              The bottle is rigid, and the surface treatment is flexible. Both are indispensable. A good combination of the two can produce high-quality products. The first-class designers are based on the product craftsmanship, to show the customer’s product demands in the most suitable graphics, and the outstanding factory is to realize the design effect with superb skills.

Post time: Jul-16-2021