Protective film is a kind of film used to protect the surface of easily damaged objects. Its purpose is to prevent the surface of the protected object from being damaged or contaminated during transportation, assembly, or processing. The protective film will always be attached to the surface of the object to be protected, and will not be torn off and discarded until the object is delivered to the user. At present, the commonly used protective film substrates in the market include OPP film, PVC film, PET film, PE film, and some high-temperature resistant high-end films such as PI film, PEN film and PEEK film. The commonly used protective film substrate in the market is PET And PE film.


1. Classification and application of protective film
The protective film can be divided into many types from different applications, and different types determine the processing technology and market application of the protective film. For example, from the perspective of market applications, it is mainly divided into traditional protective films, flat-panel display protective films and consumer electronic protective films; from the perspective of viscosity, the market is mainly divided into low-viscosity protective films, medium-viscosity protective films and high-viscosity protective films. In terms of processing technology, it mainly includes sizing protective film and self-adhesive protective film.





2. The basic performance of the protective film
(1) Appropriate and stable viscosity;
(2) Easy to tear off;
(3) It has a certain degree of scratch resistance;
(4) The crystal point of the substrate is within the standard range (high-end electronic protective film requires no crystal point);
(5) After the protective film is torn off, there is no residual glue or degumming, and no pictures are left;
(6) After a long time of bonding, there should be no bubbles floating or warping;
(7) It must have a certain degree of weather resistance when in use


3. Protective film structure and process
From the perspective of common types of protective films on the market, they mainly include traditional application protective film types, such as glued protective films and self-adhesive protective films, and LCD protective films that have been used for consumer electronics protection. We will focus on a brief introduction to these three kinds of films, and the following film will be introduced separately for the following protective films.