Coated paper technical indicators
Oct 26, 2022
The technical indicators of the coated paper are as follows, dry silicon coating amount, normal temperature peeling force, aging peeling force and residual adhesion rate.
The dry silicon coating amount refers to the amount of the release agent coated on the material, in grams per square meter. Generally, the coating amount of solvent-based silicone oil is from 0.30 to 0.80 grams per square meter, and the coating amount of solvent-free silicone oil is from 0.80 to 1.30 grams per square meter. Professional testing equipment is required to test the coating amount. The amount of silicone oil coating directly affects the peel performance. The higher coating amount can cover the base paper densely and ensure the uniform distribution of silicone oil. The lower silicone oil coating amount is prone to leakage and other phenomena, resulting in poor peeling. Some release coating suppliers reduce the coating amount of silicone oil, resulting in heavier peeling and producing heavy release paper, which is quite risky when used. Reliable manufacturers can adjust the peel force by adjusting the chemical formula without reducing the coating amount of silicone oil. This takes a long time to accumulate technology, rather than overnight.
Normal temperature peel force, the peel force data obtained by standard test methods at normal temperature, the unit is N/25mm, which can be converted into grams. Generally, 0.10N/25mm, that is, the peeling force below 10 grams, commonly known as light peeling; 0.20N/25mm, that is, the peeling force below 20 grams, commonly known as medium peeling; 0.35~0.45N/25mm, that is, 35~45 grams Peeling force, commonly known as heavy peeling; 0.60~0.80N/25mm, that is, 60~80 grams of peeling force, commonly known as heavy peeling; Of course, there are also 0.03~0.04N/25mm, that is, 3~4 grams of peeling force, commonly known as light peeling Light peeling; also has a peeling force of 1.00N/25mm, that is, more than 100 grams, commonly known as overweight peeling.
Aging peel force, the peel force data measured after aging, is generally slightly larger than the normal temperature peel force.
Residual adhesion rate refers to the force of the second peeling of the release paper after peeling off. The data obtained after calculation mainly reflects the curing effect of silicone oil. The residual adhesion rate of UV curing silicone oil is generally 100%, and the residual adhesion rate of thermal curing silicone oil is 90%. It would be suspicious if a few suppliers claim to have 100% residual stickiness of their release liner. If desiliconization occurs, the residual adhesion rate of this release paper is generally not higher than 70%. The testing of release paper technical indicators is a rather complicated project. Generally, electronics factories and tape factories can only test the latter data. As for the coating amount of silicone oil, it generally does not appear in the technical report of the release coating supplier.
