Strapping and Filament Tapes

< FONT face = Arial size = 2 > Strapping and filament tapes are strengthened with many woven filaments yarns embedded in the adhesive on the tape’s backing. Strapping tapes and filament tapes are commonly used in packaging applications. They consist of an adhesive-coated backing called a carrier. Single-sided strapping tape is used to attach overlapping or adjoining materials. Double-sided strapping tape is coated with adhesive on both sides and allows the joining of items back-to-back. Strapping films are synthetic resin adhesives that sometimes include a carrier fabric. Typically, strapping films are used under heat and pressure as an interleaf in the production of bonded structures. Transfer tape, a highly versatile product that consists of a thin adhesive film without a carrier, can be transferred to most dry surfaces from a peel-away release liner. Specialty strapping and filament tapes are also available.

Important specifications for strapping and filament tapes include width, thickness, and length. Physical properties include peel strength, tensile strength, temperature resistance, and dielectric strength. Strapping tapes and films bond to a variety of substrate materials. Examples include ceramics and glass, concrete and masonry, foam and leather, metal and plastic, paper and paperboard, rubbers and elastomers, textiles and fabrics, and wood and wood products. Liners for double-sided strapping tapes often incorporate differentially coated release liners that are easy to peel. These release liners are made of paper, film, or silicone sheets. Board liners are heavy weight paper liners that are usually measured in terms of points. The 12-point liner is the most common type with strapping and filament tapes.

Selecting strapping and filament tapes requires an analysis of coating types. Acrylic adhesives provide excellent environmental resistance. Epoxy resins exhibit high strength and low shrinkage during curing. Polyurethane (PUR) and isocyanate adhesives provide excellent flexibility, impact resistance and durability. Silicone adhesives have a very high temperature resistance. Rubber-based adhesives provide highly flexible bonds. Pressure sensitive adhesives (PSA) are tacky at room temperature in a dry (solvent-free) form. They adhere firmly to a variety of surfaces upon contact, requiring only the application of finger or hand pressure. Some strapping and filament tapes are thermally activated or require moisture. Others, such as latex gums, adhere to themselves. Hot melt and thermoset strapping and filament tapes are commonly available.

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