1.The principle of protective film adhesive (glue):
(1) Film: The protective film adhesive is a viscoelastic polymer. The adhesive layer can be in close contact with the surface of the adherend and flow into the groove of the adherend surface as much as possible, so that the effective contact area is increased.

(2) Tear-off film: The adhesive layer has high peeling resistance. The higher the peeling speed, the higher the peeling strength of the pressure-sensitive adhesive.

(3) Adhesive properties (viscosity): T<A<C<K. Initial tack, adhesion, cohesion, and keying.






2. The main factors affecting stickiness:
(1) Wetting: The pressure-sensitive adhesive can achieve close contact only with good wetting with the surface of the object to be adhered, creating conditions for physical and chemical bonding.

(2) Molecular movement and diffusion: The pressure-sensitive adhesive molecules will move to the surface of the material to be adhered. When the distance bond between the two is less than 5A, physical and chemical bonding will occur.

(3) Penetration: The adhesive layer flows and penetrates into the groove and the gap under a certain pressure, so that the contact area between the two increases. At this time, a mechanical bonding force is generated between the adhesive and the material to be adhered.