Initial Tack: Initial tack reflects the tape's instantaneous adhesion to the substrate upon contact. It's typically measured by the steel ball number; for example, BOPP pressure-sensitive adhesive tape for sealing boxes requires a steel ball number ≥10# (corresponding to a diameter of 11.11mm). In express packaging, tape with good initial tack adheres immediately to the carton surface when the courier seals the box quickly, eliminating the need for prolonged pressing and improving efficiency. Poor initial tack prevents the tape from adhering promptly, hindering packaging operations.
Holding Tack: Holding tack assesses the tape's ability to maintain adhesion after prolonged application. Typically, under a 1kg load, the hanging time should be ≥60 minutes. For applications requiring long-term fixation, such as temporary markings on industrial equipment or warning signs in construction, high-holding printed tape ensures the signs remain attached for an extended period, providing continuous and effective warnings. Insufficient holding tack may cause the signs to fall off quickly, posing a safety hazard.
Peel Strength: Peel strength reflects the force required to peel the tape from the surface of the adhered object. For example, the 180° peel strength for stainless steel generally requires ≥3.5 N/10 mm. In the use of label printing tape, when labels need to be replaced, tape with appropriate peel strength ensures that the label adheres firmly during use and leaves no adhesive residue on the surface of the adhered object upon removal, keeping the surface clean. If the peel strength is too high, the label is difficult to remove and may even damage the surface of the adhered object; if the peel strength is too low, the label easily falls off on its own, failing to meet usage requirements.
Heat Aging Performance: Heat aging performance simulates the performance changes of the tape after prolonged storage in a high-temperature environment. It is generally required that after being placed at 70℃ for 168 hours, the peel strength retention rate should be ≥80%. In some high-temperature storage environments, such as the high temperatures in summer warehouses, printed tapes with good heat aging performance can ensure sufficient adhesion after long-term high-temperature storage, without phenomena such as delamination, aging, or brittleness, ensuring the stability of the packaging.
Low-temperature toughness: Low-temperature toughness is related to the performance of the tape in cold environments. Generally, it is required that the tape can be bent 180° around a 10mm diameter axis without cracking at -20℃. In northern winters, outdoor temperatures may drop below -20℃ during logistics transportation. At this temperature, printed tape with good low-temperature toughness will not become brittle and break due to low temperatures during operations such as sealing boxes and affixing labels, ensuring the normal operation of logistics packaging.
