BOPP sealing tape mother roll: The specification is expressed by "width × length × thickness", where "width" is the width of the tape, generally expressed in mm or cm, generally ≥ 10mm, as early as the 1980s, common specifications are: 72mm , 60mm, 50mm, 30mm, etc.; nowadays, has gradually changed to: 60mm, 48mm, 45mm, 40mm, 30mm, etc.; "long" is the total length after the tape is opened, generally expressed by "m" or "code" ( 1 yard = 0.9144m), common lengths are 50m, 100m, 150m, 200m, 500m, etc.; thickness refers to the total thickness of BOPP original film + adhesive layer (unit: micron, μm), commonly used 45 ~ 55μm. For example 50mm × 100m × 50μm"
   Calculation method for the unit price of each roll of tape: The tape industry usually uses "yuan/square meter" to calculate the price of the tape, then "price per roll = width (m) * length (m) * square price"