Another example is polyethylene containers which have g […]
Another example is polyethylene containers which have good acid and alkali resistance, but are not resistant to many organic solvents, while nylon containers are resistant to hydrocarbons and organic solvents, but have poor acid and alkali resistance (especially poor acid resistance). Polycarbonate bottles can be used for packaging products (such as juice) that are filled at high temperatures, but if polycarbonate bottles are used for carbonated beverages that require good barrier properties (to prevent the escape of carbon dioxide in the beverages) or edible oils ( It is necessary to prevent oxygen from entering the bottle to avoid oxidation and rancidity of the edible oil), the product cannot be well protected, and the ideal packaging effect cannot be obtained; while the ordinary polyester stretch bottle packaging carbonated beverages can effectively prevent the beverage Carbon dioxide escapes (polyester stretch bottles have excellent barrier properties). Using them in the packaging of edible oil can delay the oxidative deterioration of edible oil and extend its shelf life (polyester stretch bottles have good oxygen barrier properties and can effectively prevent Oxygen in the upper atmosphere enters the bottle through the wall of the container), but when it is used to package high-temperature-filled juices and other commodities, the polyester stretch bottle will deteriorate severely and lose its use value during high-temperature filling.
Polyethylene bottles can hold substances such as acids and alkalis rather than organic solvents such as benzene and toluene (the swelling strength of polyethylene bottles is significantly reduced or organic solvents escape through the walls of the container), while nylon containers are not suitable for storage of acids and alkalis. However, it is very suitable for containing organic solvents such as benzene and xylene.