What are the Techniques for Glass Bottles

Glass bottle is one of the main products of Nantong Size Plastic Industry Co., Ltd. The production process of glass bottle includes:

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 according to a certain proportion, and then enters the tank kiln or tank furnace for high temperature (1550~1600 degrees) heating through conveying equipment. This process makes 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 entering 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 basically use the blowing process. The technological process is: charging → blowing → backward blowing → initial shape

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) Decoration firing

First print the pattern on the baking paper made of special materials, and then stick the printed decoration firing paper on the glass bottle, dry it and put it in the electric heating stove to heat and cool, the pattern will be printed on the glass surface. It has strong adhesion, and decoration firing process is divided into high temperature type and low temperature type.

Blowing → turning over the prototype → positive blowing and solidification and cooling of the bottle and can → clamp the bottle → cooling and transport

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.

3) Sandblasting

The sandblasting process uses compressed air as the power to form a high-speed jet beam to spray abrasives (quartz sand, emery, etc.) on the surface of the glass to be treated at a high speed, causing physical changes outside the surface due to the impact and cutting action of the abrasive on the surface , Make it obtain a certain degree of cleanliness and different roughness. The surface of the glass bottle is sandblasted to form a hazy, noble and elegant visual effect, and it also has a more hand-feeling.

4) 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 conducts drying treatment. Glass bottle spray color is divided into high temperature and low temperature according to temperature. Nowadays, high temperature is rarely used due to environmental protection and energy consumption. According to the color, 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.

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