How to choose release paper? Key Technical Indicators and Practical Selection Guidelines

1、 Silicon coating amount: the "basic parameter" of release effect

The dry silicon coating amount refers to the coating weight of the release agent on the surface of the substrate, measured in grams per square meter, and is one of the core indicators determining the performance of release paper.

 The commonly used solvent based silicone oil in the current market typically has a coating amount of 0.30-0.80 grams per square meter; Solvent free silicone oil needs to reach 0.80-1.30 grams per square meter.

This indicator is not necessarily the higher the better, but it needs to be matched according to the type of adhesive: acrylic adhesive products have lower requirements for release, and can be paired with low coating release paper;Solvent glue and hot melt adhesive have strong viscosity, and high coating release paper must be selected to ensure smooth peeling. If the coating amount does not match, it is easy to encounter problems such as "not sticking" or "not tearing".

2、 Release force: an intuitive standard for measuring release performance

Release force is the force value used to detect the separation of release paper from the adhesive, commonly measured in N/25mm (which can be converted to grams). Among them, room temperature peeling force is the most basic testing item, and the industry generally defines a peeling force of ≤ 0.10N/25mm (i.e. 10 grams) as "light peeling".

It is worth noting that the release force is directly related to the amount of silicon coating: insufficient silicone oil coating may lead to excessive release force and difficulty in tearing; If the coating amount is too high, it may cause the release force to be too light and the material to easily peel off. Therefore, the matching of adhesive type and coating amount is crucial - this is also the core reason why acrylic adhesives are suitable for low coating amounts, while Solvent-based adhesives require high coating amounts.

3、 Seasonal factors: easily overlooked 'hidden influences'

Temperature changes can indirectly affect the performance of release paper.

For example, in high temperature environments during summer, the viscosity of hot melt adhesive may increase. If the coating amount of release paper is insufficient, it is easy to cause adhesion; During low temperatures in winter, some adhesives may lose their stickiness, and excessive coating may result in loose peeling.

Therefore, in actual selection, in addition to looking at the type of glue, seasonal adjustments should also be made: during high temperature seasons, the coating amount can be appropriately increased, while during low temperature seasons, a medium coating amount can be selected based on the characteristics of the glue.

Overall, technical indicators such as silicon coating amount and peel strength are the "hard standards" for determining whether release paper is suitable. 

 Choosing the right release paper can not only improve production efficiency, but also reduce material loss - remember to "base on the glue, the season, and the coating amount" to avoid most selection pitfalls.