BOPP Packing Tape: A Comprehensive Description
Composition
Base Film
1.Biaxially Oriented Polypropylene (BOPP): At the core of BOPP packing tape is a BOPP film. This film is manufactured through a sophisticated biaxial orientation process. When molten polypropylene is stretched in both the machine and transverse directions simultaneously, the polymer chains align in an ordered manner. This orientation significantly enhances the film's properties. BOPP films are renowned for their high clarity, which gives the tape a transparent appearance, allowing for easy identification of the contents beneath. For example, in e - commerce packaging, the transparency enables quick visual inspection of products within the box without opening it.
2.Strength and Durability: The biaxial orientation imparts excellent tensile strength to the BOPP film. It can withstand substantial pulling forces without breaking. This strength makes the tape suitable for heavy - duty packaging applications. A single - layer BOPP film used in packing tape can typically handle weights ranging from a few kilograms to tens of kilograms depending on its thickness and quality.
Adhesive
1.Pressure - Sensitive Adhesive (PSA): Coated on one side of the BOPP film is a pressure - sensitive adhesive. PSAs are formulated to bond strongly to a variety of surfaces when pressure is applied. They contain a blend of polymers, tackifiers, and other additives. The polymers provide the cohesive strength of the adhesive, while tackifiers increase the stickiness. For instance, acrylic - based PSAs are commonly used in BOPP packing tapes. These adhesives offer a good balance of adhesion to different substrates like cardboard, plastic, and metal.
2.Immediate Bonding: One of the key advantages of the pressure - sensitive adhesive is its ability to form an immediate bond. As soon as the tape is pressed onto a surface, the adhesive molecules start to interact with the surface molecules, creating a strong attachment. This makes the tape highly convenient for on - the - go packaging tasks, such as sealing boxes in a busy warehouse.
