The adhesion of the pressure-sensitive adhesive on the protective film is mainly manifested in four aspects, which are the initial tack, the adhesive force, the cohesion and the sticking force. The more the four sticky force performance highlights the better adhesion of pressure-sensitive adhesive!
The initial tack, also known as fast stickiness, refers to the ability to resist separation immediately when the pressure-sensitive adhesive is in contact with the surface of the adherend with a very light pressure.
Adhesive force refers to the ability to resist the separation of the interface between the pressure sensitive adhesive and the surface of the adherend after appropriate pressure for pasting. Generally measured with a 180 ° peel strength of pressure sensitive adhesive.
Cohesion is the cohesion of the pressure-sensitive adhesive itself, generally with pressure-sensitive adhesive paste resistance to shear creep capacity that is holding the amount of sticky.
Sticky force refers to the adhesive between the pressure sensitive adhesive and the substrate or pressure sensitive adhesive and the primer and the primer and the substrate. Under normal circumstances sticky force is greater than the adhesive force, it is generally unable to measure this value.
Good pressure-sensitive adhesive, the four major adhesive properties should meet the initial viscosity <adhesion <cohesion <sticky force. Otherwise, it may lead to quality problems. For example, when the original adhesive force> adhesive force, there will be no pressure-sensitive performance; if the adhesive force> cohesion, the stripping of pressure-sensitive adhesive products will appear when the adhesive layer damage, leading to adhesive stained sticky surface, And other ills; if cohesion> sticky force, there will be degumming phenomenon.