Box-sealing tape, parcel tape, packing tape, or shipping tape is a pressure-sensitive tape used for closing or sealing corrugated fiberboard boxes. It consists of a pressure-sensitive adhesive coated onto a backing material which is usually a polypropylene or polyester film which is oriented to have strength in both the long (machine) direction and the cross direction.
Common packing tape is 50 mm wide, but narrower and wider variants are also common, like for example 36 mm, 48 mm and 72 mm (approx 1.5 in, 2 in and 3 in). A variety of backing strengths and calipers as well as adhesive formulations are available. The thickness of the tape may be in the order of 40 Micrometre for low strength, 45 μm for normal strength, or 50 μm and up for extra strength.
It is often transparent or tan (beige, buff, brown), but can be had in any color with or without prints and logos. The length of a roll varies, but can be around 50-70 meters.
The tape can be used as a "six-strip" closure or "H-seal" by applying cross strips on the ends of the box. This is used when a relatively weak tape is used or when extra box reinforcement is needed. This method also seals the box to help keep contaminants out.
This tape has also been used by artists (e.g., Mark Jenkins) as a way to create molds of objects, as the strength of the tape allows for a strong shell for the mold when completed.
Automated machinery for application of tape to high-speed lines is also common.
If a tape remains on corrugated box during recycling, a tape should be chosen which does not hinder box recyclability.ASTM D1974 For example, when taped corrugated boxes are recycled, film backed box sealing tapes do not hinder box recycling: the PSA adhesive stays with the backing and is easily removed.
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