The primary function of plastic tube caps is to protect the openings of pipes or packaging containers, providing sealing, protection, and aesthetic enhancement. They are predominantly used in consumer goods packaging, such as for cosmetics and pharmaceutical ointment tubes.

Common Types and Functions:
Based on installation methods and application scenarios, plastic tube caps are mainly categorized into the following types:
Flip-Top Caps: Equipped with a hinge structure allowing for one-handed operation. Commonly found in squeeze tubes for products like toothpaste and facial cleansers.
Threaded Caps: Secured by rotating threads. Used in industrial and pharmaceutical environments requiring high-level sealing, waterproofing, or leak prevention.
Safety Closures: Includes Child-Resistant caps and Tamper-Evident caps. These are widely used for packaging pharmaceuticals and chemicals.