| With the development of production equipment and raw materials, plastic packaging has been widely used in various fields. In recent years, compared with glass bottles, such packaging methods that are light in weight, non-fragile, easy to manufacture and disinfect, and easy to seal and cost-effective have been widely recognized by pharmaceutical companies and rapidly developed.
The raw materials of medicinal plastic bottles need to meet the requirements of medical and health. The most common plastic varieties are: polyethylene (PE), polypropylene (PP), polystyrene (PS), polyester (PET). Polyethylene (PE) is corrosion resistant and can be chlorinated. Polyethylene is classified into high density (HDPE), low density (LDPE), and linear low density (LLDPE). HDPE has high melting point, hardness and strength, low water absorption, excellent processability and radiation resistance, and is often used in the production of plastic bottles for tablets. LDPE has good flexibility, elongation and impact strength and can be used. Plastic bottle for eye drops; LLDPE has high impact strength, fatigue resistance and wear resistance, and is less used in medical packaging.
Polypropylene (PP) has low density, and is superior to high-density polyethylene in strength, hardness and heat resistance, but becomes brittle at low temperature, is not wear-resistant, and is easy to age. However, the corresponding additive can be added for modification, and the functional level of HDPE can be achieved after modification.
Polystyrene (PS) is colorless and bright, and its light transmittance is second only to plexiglass. It is excellent in color, water resistance, chemical stability and strength. However, PS is brittle, prone to stress cracking, and is not resistant to organic solvents such as benzene and gasoline, so it is less used in pharmaceutical packaging. However, after modification, the impact resistance of the material can be greatly improved.
As a pharmaceutical packaging container, PET has many advantages. First of all, PET bottles are light and strong, and their strength and elasticity are significantly higher than those of plastic bottles made of plastic materials. They are better at insulating water vapor and oxygen in common plastics. PET bottles have outstanding chemical resistance. It can be used for the packaging of all items except strong alkali and some organic solvents. It is suitable for making medicine bottles with thin walls, light weight and high strength. Therefore, PET bottles have a tendency to replace traditional glass bottles.
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