Pharmaceutical Packaging Borosilicate Glass Tube Round

Pharmaceutical Packaging Borosilicate Glass Tubing

raw material

Including main raw materials and auxiliary raw materials. The former refers to the introduction of raw materials such as the oxides that form the network structure of the glass, the intermediate oxides and the oxides outside the network; the latter can accelerate the melting of the glass or make it obtain certain necessary properties.

main ingreadient

According to the nature of the introduced oxides, it is divided into acidic oxide raw materials, alkali metal oxide raw materials and alkaline earth metal oxide raw materials.
① Acidic oxide raw materials: raw materials such as SiO2, B2O3, Al2O3, etc. SiO2 is the skeleton of the glass structure in silicate glass. It gives the glass high strength, good chemical stability, heat resistance and low expansion, but it will increase the melting temperature of the glass and increase the viscosity. The cited raw materials of SiO2 are silica sand, sandstone, and quartzite. Adding B2O3 to the glass can reduce the thermal expansion of the glass, increase the refractive index, thermal shock resistance and chemical resistance, reduce the viscosity of the glass when the temperature is higher, and increase the viscosity of the glass when the temperature is lower. The cited raw material for B2O3 is borax or boric acid. Adding Al2O3 to the glass can reduce the tendency of glass to crystallize and enhance the chemical stability, increase the strength, and increase the viscosity of the glass. The cited raw materials are usually feldspar with K2O or Na2O and SiO2, and industrial alumina can also be used. Cangzhou Tianchang Craft Glass Products Factory specializes in the production of various types of high borosilicate glass tubes
② Alkali metal oxide raw materials: raw materials with Na2O and K2O. Adding Na2O and K2O to the glass can reduce the melting temperature and viscosity, but it will make the chemical stability of the glass worse. The cited raw materials are soda ash (Na2CO3) and potash (K2CO3).

It mainly includes the steps of batch preparation, melting, forming, annealing and post-processing.

Glass tube blowing method: used to manufacture hollow glass products, such as water cups, utensils, bottles, jars, light bulbs, etc. For manual blowing, a hollow iron blowing pipe with a length of about 1.5m is used, one end is dipped in glass liquid (picking material), and the other end is a blowing nozzle. After picking the material, roll it evenly on the rolling plate (bowl) and blow air to form a glass frit, which is blown into the product in the mold; it can also be freely blown without a mold, and finally knocked off from the blow pipe. When large-scale products are formed, it is necessary to repeatedly pick and roll evenly to collect enough material. During mechanical blowing, the molten glass flows out from the outlet of the glass melting furnace, and is formed into gobs with a set weight and shape through the feeder, which is cut into the preliminary mold to be blown or pressed into the preliminary shape, and then transferred to the forming mold for blowing. product. The blow-blowing method, which is blown into a preliminary shape and then blown into a finished product, is suitable for making small-mouthed utensils and bottles. The weighing-blowing method of pressing into a primary shape and then blowing it into a finished product is suitable for making large-mouthed utensils and thin-walled bottles and cans

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