PET heat-seal film What is it like? What factors affect its quality? Single‑sided or double‑sided PET heat‑seal films, owing to their excellent high‑temperature resistance, are widely used in die‑cutting and the lamination of adhesive products. This product uses PET heat‑seal film as its base material, with a very thin release coating applied uniformly to one or both sides. The surface of the PET heat‑seal film is smooth and even, with a uniform coating free of defects such as wrinkles, particles, or bubbles. It exhibits outstanding physical properties, tight thickness tolerances, and low thermal shrinkage, along with high tensile strength and chemical inertness.

　　PET heat-seal films are typically used to isolate adhesive substances and are widely employed in industries such as electronics, inkjet consumables, reflective materials, adhesive tapes, and pre‑applied self‑adhesive materials. Based on the flow characteristics of the silicone coating and the changes in release force upon heating, release liners can be classified into light‑release, medium‑release, and heavy‑release types; the release force can be adjusted as needed, and these films exhibit excellent heat resistance.

　　PET heat-seal film thicknesses: 0.019 mm, 0.025 mm, 0.036 mm, 0.05 mm, 0.075 mm, 0.1 mm, 0.125 mm, 0.175 mm, 0.188 mm

　　The heat-seal film features controllable demolding force, high gloss, and exceptional cleanliness, with a residual adhesion of 92%. It exhibits excellent surface properties, superior mechanical strength, and outstanding chemical resistance, ensuring high stability under adverse weather conditions and a long shelf life.

　　The main factors affecting the quality of PET heat-seal films are as follows:

　　1. Substrate: Heat-seal films are produced by coating an organic silicone release agent onto the surface of PET heat-seal film, and the quality of the substrate directly affects its performance. Domestically produced PET film substrates lag behind their international counterparts in terms of thickness control and thermal shrinkage.

　　2. Residual Adhesion Rate: The residual adhesion rate refers to the force required to peel the release liner during a second removal after the first. The resulting data primarily reflects the curing performance of the silicone oil.

　　3. Peel strength: Peel strength directly affects the performance of PET heat-seal films; in most industry standards, the allowable tolerance for peel strength is ±15%.

　　4. Processing Environment: With advancements in product design and improvements in quality and manufacturing processes, the cleanliness requirements for PET heat-seal films are becoming increasingly stringent, particularly in the electronic die-cutting industry.

　　Of course, in actual production, numerous factors influence the quality of PET heat-seal films. Different industries, companies, and processes have varying requirements for the use of different types of films.