Plastic tubes are categorized by the type of plastic resin used, which determines their properties.
Plastic Type | Abbreviation | Key Characteristics | Common Uses |
---|---|---|---|
Polyethylene | PE (LDPE, HDPE) | • Soft and highly squeezable (especially LDPE). • Good moisture barrier. • Chemically resistant. • Can be opaque, translucent, or clear. | Most common type. Lotions, creams, hair gels, ointments, hand creams. |
Polypropylene | PP | • More rigid than PE, has a "snap-back" quality. • Excellent chemical resistance. • Higher heat resistance. • Can be made clear. | Toothpaste, thick pastes, pharmaceutical ointments, products requiring clarity and rigidity. |
Co-extruded Tubes | Multi-layer | • Combines layers of different plastics (e.g., PE/PP/PE). • Allows for custom properties: a white inner layer for opacity, a clear outer layer for product visibility, enhanced barriers. | Premium cosmetics, products needing specific barrier protection. |
Tube Body: The main reservoir, made of flexible plastic.
Shoulder: The conical section connecting the body to the neck.
Neck: The opening where the product is dispensed. Comes in various sizes (e.g., 13mm, 19mm, 22mm) to control flow.
Cap/Closure: Screws onto the neck. Types include:
Flip-Top Cap: Very user-friendly for one-handed use (e.g., in the shower).
Screw Cap: Simple and secure.
Nozzle Tip Cap: For precise application (e.g., eye cream, glue).
Bottom Seal: The tube is filled from the bottom and then heat-sealed and crimped, creating an airtight seal.
Tamper-Evident Seal: A plastic band or membrane that breaks when the cap is first twisted open, proving the product is new.