I. Main Raw Materials of Pharmaceutical Glass Tubes and Bottles

The main raw materials of pharmaceutical glass tubes and bottles include natural mineral materials, quartzite, caustic soda, limestone, etc. Among them, quartz sand is the main component of pharmaceutical glass, because it contains abundant silicon dioxide (SiO₂), which is the key element in forming the glass skeleton. The purity and particle size of quartz sand have a direct impact on the quality of the glass. Therefore, in the production process, quartz sand needs to be strictly screened and purified to ensure the quality of the final product.

In addition to quartz sand, auxiliary materials such as caustic soda (NaOH) and limestone (CaCO₃) also play an indispensable role. Caustic soda is used to adjust the alkalinity of the glass, affecting the melting temperature and viscosity of the glass; limestone mainly provides calcium ions, which helps to improve the chemical stability and mechanical strength of the glass. In addition, depending on the specific needs, other raw materials such as borax, feldspar, and aluminum hydroxide may be added to further adjust the properties of the glass.

 II. Production Process of Pharmaceutical Glass Tubes and Bottles

The production process of pharmaceutical glass tubes and bottles can be roughly divided into several key steps: raw material preparation, melting, molding, annealing, and inspection and packaging.

1. Raw Material Preparation

In the raw material preparation stage, the screened quartz sand, caustic soda, limestone, and other raw materials need to be mixed evenly in a certain proportion. This step is crucial because the ratio of raw materials directly affects the chemical composition and physical properties of the glass. The mixed raw materials need to be sent to the material storage bin for later use.

 2. Melting

Melting is the process of melting the evenly mixed raw materials into liquid glass at high temperatures. The temperature of the furnace is usually controlled above 1500℃ to ensure that the raw materials can be completely melted. During the melting process, the glass liquid needs to be continuously stirred and mixed to ensure its uniform composition. At the same time, the temperature and atmosphere of the furnace must be strictly controlled to prevent defects such as bubbles and stones from appearing in the glass liquid.

3. Molding

Molding is the process of shaping the melted glass liquid into the desired shape through a mold. The molding methods for pharmaceutical glass tubes and bottles mainly include hand blowing, machine blowing, and pressing. Hand blowing is suitable for producing products with complex shapes and small batches; machine blowing is suitable for mass production of products with regular shapes; pressing is to press the glass liquid into the desired shape using a press, suitable for producing products with simple shapes and uniform wall thickness.

During the molding process, it is necessary to ensure that the glass liquid evenly fills the mold to avoid bubbles and cracks. The molded glass tubes and bottles also need to be cut and ground to obtain the required Size and appearance.

4. Annealing

Annealing is the process of placing the molded glass tubes and bottles in an annealing furnace, slowly heating them to a certain temperature, maintaining them for a period of time, and then slowly cooling them to room temperature. The main purpose of annealing is to eliminate internal stress in the glass, improve the strength and stability of the glass, and reduce the risk of breakage during use. The heating and cooling rates during the annealing process must be strictly controlled to ensure the annealing effect.

5. Inspection and Packaging

The annealed pharmaceutical glass tubes and bottles need to undergo strict inspection to ensure that their quality meets relevant standards and requirements. Inspection items include appearance inspection, Size measurement, physical property testing, and chemical property testing. Appearance inspection mainly checks whether the surface of the glass bottle has bubbles, stones, cracks, and other defects; Size measurement mainly checks whether the diameter, height, and wall thickness of the glass bottle meet the requirements; physical property testing mainly tests the strength, hardness, and heat resistance of the glass bottle; chemical property testing mainly tests the corrosion resistance and chemical stability of the glass bottle.

Qualified pharmaceutical glass tubes and bottles can be packaged and stored. Packaging usually uses cartons or pallets to protect the glass bottles from damage during transportation and storage. The storage environment should be kept dry, ventilated, and clean to avoid the glass bottles being affected by moisture and pollution.

In summary, the production process of pharmaceutical glass tubes and bottles requires strict control of the quality of each link to ensure the safety and reliability of the products. Only through strict production processes and quality inspection can pharmaceutical glass tubes and bottles that meet standards and requirements be produced, providing high-quality packaging materials for the pharmaceutical industry.