- Nov 22, 2017 -
The technical indexes of the release paper are as follows: dry silicon coating amount, peeling force at room temperature, aging peeling force and residual adhesion rate.
Dry silicon coating amount refers to the amount of coating agent on the material, the unit is grams per square meter. The coating amount of solvent silicone oil is 0.30~0.80 grams per square meter, and the coating amount of solvent free silicone oil is from 0.80~1.30 grams per square meter. Professional testing equipment is required to test coating amount. The amount of silicone oil coating directly affects peeling performance. The higher coating amount can cover the base paper evenly, and ensure the uniform distribution of silicone oil. While the lower silicone oil coating, it is prone to leakage coating and other phenomena, resulting in poor peeling. Some coating suppliers reduce the amount of silicone oil coating, resulting in peeling off the weight, producing heavy release paper, in use, it is quite risky. The reliable manufacturer is to adjust the stripping force by adjusting the chemical formula without reducing the coating amount of silicone oil. It takes a long time to accumulate technology, not overnight.
Peel force at room temperature, the peel force data obtained by standard test method at room temperature, the unit is N/25mm, can be converted into grams. General 0.10N/25mm, 10 grams of peel strength, commonly known as 0.20N/25mm, is light peeling; 20 grams peel strength, commonly known as 0.35~0.45N/25mm, which is 35~45 in peel; grams of peel strength, commonly known as 0.60~0.80N/25mm, that heavy peeling; 60~80 grams of peel strength, commonly known as heavy peeling; there are 0.03~0.04N/25mm that is, 3~4 grams of peel strength, commonly known as softly; also have 1.00N/25mm, which is more than 100 grams of peel strength, commonly known as overweight stripping.
The peeling force of aging and the peel force measured after aging are generally slightly larger than the peel force at normal temperature.
The residual adhesion rate refers to the force of the second stripping of the release paper after the first peeling. The calculated data mainly reflect the effect of silicone oil curing. The residual adhesion rate of UV cured silicone oil is generally 100%, and the residual adhesion rate of heat cured silicone oil is 90%. A small number of suppliers claim that the residual adhesion rate of their release paper is 100%, which is doubtful. In the case of desilication, the residual adhesion rate of the release paper is generally no higher than 70%. The test of the technical index of the release paper is a rather complicated project. General electronic factory and tape factory can only test the latter data. As for silicone oil coating, it will not appear in the technical report of the coating supplier.