At present, with the popularity of mobile phones and other digital products in China, the protective film has now slowly become a screen protective film of a collectively. What is the principle of protective film production?
1, protective film adhesive (glue) principle
The protective film is a viscoelastic polymer
Film: its adhesive layer can be in close contact with the surface of the sticky material, and as much as possible into the surface of the groove into the paste, so that the protective film effective contact area increases.
Tear film: all the layers have a high anti-stripping capacity, the greater the peel rate of the protective film, the higher the peel strength of pressure-sensitive adhesive.
Adhesive properties (tackiness): Initial tack <Adhesive force <Cohesive force <Sticky force
2, the main factors affecting the viscosity
Wetting: protective film of the pressure-sensitive adhesive only with the surface of the object was sticky when there is a good wetting in order to achieve close contact, which is to create conditions for the combination of physical and chemical.
Molecular movement and diffusion: When the pressure-sensitive adhesive molecules will move to the surface of the material to be sticky, when they distance between the two keys is less than 5A, this will produce a combination of physical and chemical.
Permeation: Each glue flow, are under a certain pressure to the groove and the gap at the infiltration, so as to make the contact area between the two increases, and then the adhesive and the material can be bonded between the mechanical binding force The
3, the preparation of substrate film: blow molding, casting, rolling three steps.
4, the substrate film surface treatment
Corona treatment: the formation of polar reaction groups, the formation of a very small potholes is corona treatment.
Coating: We put the liquid glue evenly on the substrate film and then the initial drying, to complete the coating.
What kind of material is the protective film?
There are many types of protective film, according to its material is divided into the following, the general protective film manufacturers have.
1, PP material protective film is the first to appear in the market, the chemical name is polypropylene, there is no adsorption capacity, the general glue to stick, tear off the screen will leave a mark on the glue, a long time will corrode the screen The Has been basically eliminated.
2, PVC material protection paste is characterized by its own soft texture, and paste convenient, but this material is relatively thick, light transmission is not good, so that the screen looks more hazy. After tearing off the screen will also leave a mark on the glue. This material is also easier to change with the temperature and turn yellow out of oil, the service life is relatively short.
3, PVC improved version of the protective film, to solve the previous heavy and poor light transmission problems.
4, PET material protection film is the most common on the market a protective paste, mobile phones and Tablet PC is used in this three-tier PET protective film.
5, AR material protection is the best known on the market a screen protector.
6, PE material is the main raw material LLDPE, the material is relatively soft, there is a certain degree of stretch.
7, OPP material protective film from the appearance point of view closer to the PET protective film, the hardness of a larger, there is a certain flame retardant, but its use of poor paste, the market rarely used.
8, OCA material protective film from the appearance point of view with the other material is no different, but the OCA material protective film is produced in Japan, which is now the most used in Apple's mobile phone, its brightness and hardness than other materials Ok, so OCA is now the most popular material for mobile phone protective film.
vanco are screen protector factory located in shenzhen,both mobile screen protector film roll and finished products are available