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2022
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Principles of Production and Material Classification of Mirror Safety Films
Currently, with advances in science and technology and the widespread adoption of smartphones and other digital devices in China, mirror‑protective films have come to serve as a general term for screen protectors. Below, we’ll briefly explain the manufacturing principles and material classifications of these films. Let’s take a look.
At present, with the advancement of science and technology and the widespread adoption of mobile phones and other digital devices in China, Mirror safety film It has gradually become a generic term for screen protectors. Below, we’ll briefly explain the manufacturing principles and material classifications of mirror‑grade safety films.
1. Adhesion (gluing) principle of mirror safety film: The protective film is a viscoelastic polymer adhesive film. Its adhesive layer makes close contact with the surface of the substrate and penetrates as much as possible into the microscopic irregularities on that surface, thereby increasing the effective contact area of the protective film. 2. Wettability—the primary factor influencing adhesion: For a pressure-sensitive adhesive to achieve tight contact with the substrate, it must first be thoroughly wetted by the surface of the material being bonded, creating favorable conditions for physicochemical bonding. Molecular motion and diffusion: When the molecules of the pressure-sensitive adhesive migrate toward the surface of the substrate, physical and chemical bonds form once the intermolecular distance falls below approximately 5 Å. Under appropriate pressure, each layer of adhesive flows into the micro‑grooves and gaps, enlarging the contact area and generating mechanical interlocking between the adhesive and the substrate. 3. Preparation of the base film: methods include blown‑film extrusion, cast‑film production, and calendering. 4. Surface treatment of the base film: corona treatment creates polar reactive groups and introduces microscopic pits. Liquid adhesive is then uniformly coated onto the base film, followed by preliminary drying, completing the coating process.
Mirror safety film There are many types, which can be categorized by material as follows. Most manufacturers’ screen protectors fall into these categories: 1. The earliest type on the market was the PP‑based protector, chemically known as polypropylene. It has no adhesive properties and is typically attached with glue; once removed, it leaves behind adhesive residue that can corrode the screen over time—though this issue has largely been addressed. 2. PVC protectors are characterized by their soft texture and ease of application. However, they tend to be relatively thick, with poor transparency, making the screen appear hazy. After removal, they often leave behind sticky residues. Additionally, this material is prone to yellowing and oiling with temperature fluctuations, resulting in a shorter lifespan. 3. An improved version of PVC protectors has resolved the earlier issues of bulkiness and reduced light transmission. 4. PET mirror‑type safety films are among the most common protective films available; these three‑layer PET protectors are widely used for smartphones and tablets. 5. AR‑coated protectors are well‑known screen protectors on the market. 6. PE materials are primarily made from LLDPE, offering a soft feel and moderate stretchability. 7. OPP‑based protectors resemble PET films in appearance but are harder and possess some flame‑retardant properties; however, their adhesion is poor, so they are rarely used in the market. 8. OCA‑based mirror safety films look virtually identical to other materials at first glance. Produced in Japan, OCA protectors are now extensively employed in smartphones and offer superior optical clarity and hardness compared to other materials, making them highly popular. Mirror safety film Material.
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