Industry standards impose stringent requirements on the quality control of pre-coated films. According to the national standard GB/T 27740-2011, the tensile strength of the pre-coated film must be ≥20MPa, and the peel force must be consistently within the range of 0.5-5N/15mm to ensure that it does not delaminate or peel off during long-term use. In terms of environmental protection, the EU REACH regulation imposes strict limits on phthalates, heavy metals, and other harmful substances in adhesives, driving the industry towards environmentally friendly directions such as water-based and solvent-free adhesives.
Three aspects need attention when using pre-coated films: First, temperature control. The bonding temperature of hot-melt pre-coated films needs to be adjusted according to the film type (e.g., PET base film is usually 110-130℃). Too high a temperature will cause the film to deform, while too low a temperature will result in weak adhesion. Second, pressure uniformity. Pressure-sensitive pre-coated films need to be rolled or flatbed to ensure complete contact between the bonding surfaces. The pressure is recommended to be controlled at 0.3-0.5MPa. Third, storage conditions. Pre-coated films need to be protected from light and moisture, and the temperature should be controlled below 25℃ to prevent adhesive aging or film embrittlement.
With consumption upgrades and technological advancements, pre-coated films are developing towards functionalization and customization. For example, pre-coated films with added antibacterial agents can be used in medical packaging, while pre-coated films that block ultraviolet rays are suitable for outdoor advertising. At the same time, the application of lightweight designs (such as ultra-thin 0.05mm film materials) and biodegradable materials (such as PLA base film) has further expanded the market space for pre-coated films.
