Packaging House Technical Discussion - Machine Glass Blown

Update:17 Nov 2017

For cosmetics, fragile glass containers have a safe hea […]

For cosmetics, fragile glass containers have a safe heart, glass materials are often used in the packaging of cosmetic products, especially perfumes and high-end skin care products.




History of glass containers
Containers glass, including bottles, cans, drinks, bowls and so on. Bottle glass is different from flat glass (for windows, glass doors, transparent walls, windshields) and glass fibers (for insulation, fiberglass composites and optical communication). Container glass has a lower magnesia and sodium oxide content than flat glass, but higher silica, calcium oxide, and aluminum oxide. Its high water-insoluble oxide content gives it higher chemical durability, which is important for water and food storage. Most of the container glass is soda lime glass, made by mold pressing, while other laboratory glassware is made of borosilicate glass.
Glass container material
Glass packaging container manufacturing, that is, some quartz sand, limestone and other silicate-based materials after calcination calcination, may reach nearly a thousand degrees, and then through the mold forming, after annealing and cooling processes such as made. The main raw material of glass sand, soda, calcite, feldspar, which occupy more than 98% of glass raw materials. Other small materials include clarifiers, colorants, decolorizing agents and more. In addition, thanks to the power of glass, we use broken glass as one of our major raw materials (typically in the range of 0% -50%, sometimes even 100%) in order to recycle glass and reduce energy consumption. This is why we say that glass is an environmentally friendly material. Quartz sand of different origin of different quality, generally have white material, white material, etc., the classification of glass bottles are generally based on material color to distinguish: General to fine white, white, white, green material, brown and so on.
Glass products are superior to most products in the protection of plastic products, such as water permeability, oxidation resistance, migration, etc.

Glass container molding process
The process of forming a glass jar involves a series of combinations of actions (mechanical, electrical, etc.) repeated for a given sequence of programming, with the goal of creating a jar of the desired specific shape. There are currently two main processes for the production of glass jar containers: the blowing of narrow vials and the pressure-blowing method for larger diameter bottles and jars.



Figure 1. Blowing process



Figure 1. Pressure blowing process


Machine glass blowing
Machine glass blowing: For the hollow opening of the glass container molding, both decorative and functional products, the choice of different glass material directly determines the use of the product.
Machine glass blowing and blowing the biggest difference between the human body: to allow mass production, but a single piece of lower value products.
Process costs: mold costs (high), a single cost (low)
Typical products: food packaging, pharmaceutical packaging, utensils, kitchen utensils, jewelry, lamps
Yield suitable: only allow large quantities
Quality: high surface accuracy, strong sense of quality
Speed: a single cycle is short, high efficiency
Suitable materials
1. Soda lime glass: the most commonly used material for high volume glass blow molding machines, suitable for machine blowing, unsuitable for manual blowing
2. Lead-alkali glass: household utensils, jewelry and glass ornaments the most commonly used glass materials
3. Borosilicate glass: high temperature, stable, suitable for laboratory glassware and kitchenware
4. Design considerations
a. Artificial glass blowing machine and the mold from the restrictions, high degree of freedom of form and color, so the finished product often have a higher technical appreciation value
b. The machine blowing only suitable for large quantities, artificial glass blowing only suitable for small quantities
c. Machine blowing relative to the manual blowing, the operator of the lower technical requirements, lower labor costs






Stage1-4: The 1500 ° high temperature glass clot into the prototype mold, the bottom of the piston through the air blown into the glass clot to form a hollow open high-temperature glass clot, embryo mold left and right, high temperature clot is sent to The second blow mold.

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