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How many kinds of material are there in the protection film?

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Material type

 film

OPP material: this kind of protective film is relatively close to P, E and T protective film from appearance. It has higher hardness and flame resistance, but its use is poor. It is seldom used in general market.


PE material: the main raw material is LLDPE, the material is relatively soft, has a certain tensile properties, you can use tensile machine, tensile testing machine to do the relevant tensile, peeling and other tests to verify the characteristics. Average thickness of 0.05 m m - 0.15 m m, its viscosity according to different requirement, ranging from 5 G - 500 G (domestic and foreign different viscosity, such as South Korea film division 200 grams of the domestic equivalent of about 80 grams). PE material protection film projects are divided into static film, mesh film and so on. Electrostatic membrane is electrostatic adsorption force for adhesive force, there is no glue of a protective film, of course, relatively weak viscosity, mainly used in electroplating and other surface protection. Reticulate film is a kind of protective film with many meshes on the surface. This kind of protective film has better permeability, and the adhesive effect is more beautiful. Unlike the plain film, it will leave bubbles.


PP material: this protective film is the earliest in the market, the chemical name is polypropylene, no adsorption capacity, generally use glue to stick, tear after the glue will leave marks on the screen, the screen for a long time will be corrosion. Has been basically eliminated.


PVC material: protective film is characterized by its soft texture, and paste convenient, but this material is thick, light transmittance is not good, so that the screen looks more obscure. It also leaves a mark of glue on the screen. This material is also relatively easy to change with temperature and turn yellow oil, short service life (the market basically can not see).


PET material: This is the most common kind of protective film on the market, and mobile phones and tablet computers are using this kind of three layer P E T protective film, chemical named polyester film. The characteristics is relatively hard texture, a scratch resistant, long time use will not like PVC materials that turn yellow oil, the same tensile testing machine, tensile testing machine can choose different fixtures and the environment can do for its detection, but the protective film of general PET are relying on the electrostatic adsorption, easier blistering and shedding. But even if it falls off, it can be reused in clean water. The price of PET protective film is much higher than that of PVC. Using PET material protection film, workmanship and packaging is exquisite, there are special for hot cell phone model to order protective stickers, do not need to cut can be used directly.


A R material: A R is a synthetic material, generally divided into three layers, silica gel for the adsorption layer, P, E, T for the intermediate layer, the outer layer is a special treatment layer. The special processing layer is generally divided into two types: the AG processing layer and the HC processing layer. AG is anti glare, and frosted protective films are treated with this method. HC is the treatment of hardness. It is the treatment of high transmittance protective film. The screen protection film is characterized by that the screen does not glisten and has high transmittance (95% or more) and will not affect the display effect of the screen. The surface of the material is treated with special technology, the texture is softer, the friction and scratch resistance are strong, and the scratch will not occur for a long time. Paste by chemical material silica adsorption on the mobile phone screen, it will not cause damage to the screen itself, not tear off the mark, but also can be reused after cleaning.


OCA material: the protective film from the exterior does not have what difference with other materials, but the protective film of OCA material is produced in Japan, which is now in Apple's mobile phone application most in luminosity and hardness than other materials, so OCA is now the most popular mobile phone protection film material, is currently some people use tensile testing machine, tensile testing machine to measure the properties of the standard.

Analysis and selection
The main factors affecting the viscosity of protective film
Wettability: a pressure-sensitive adhesive is capable of intimate contact only when it is wetted with the surface of the adhered object, creating conditions for physical and chemical combination.
Molecular movement and diffusion: pressure sensitive molecules move toward the surface of the bonded material, and when the distance between them is less than 5A, physical and chemical bonding occurs.
Penetration: the flow of the adhesive layer, at a certain pressure to the gap between the groove and the gap, so that the two sides of the contact area increases, and then between the adhesive and the adhesive material will have a mechanical bond.

model selection
Different surfaces require different tack;
Similarly, different materials with similar surfaces may also require different tack;
The processing step is the key to stickiness. Subsequent processing generally has bending, stamping, cutting, drilling, thermoforming and so on;
Reasonable collocation of thickness and viscosity;
The tensile strength and elongation of the protective film ensures the flexibility and strength of the protective film;
The ultimate principle of protective film selection: adequate testing.


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