What are the key performance indicators of release paper? Release paper is a special type of paper with low or non-stick surface, mainly used to carry sticky materials (such as adhesive tape, self-adhesive, adhesive, composite materials, etc.), serving the purpose of isolating, protecting the sticky surface, and facilitating peeling. The performance of release paper directly affects the use effect of sticky materials, and the core indicators include: 1. Stability of release force: The deviation of release force within the same batch of release paper should be ≤±10% (for example, if the nominal weight is 30g/in, the actual weight should be within the range of 27-33g/in), to avoid material stretching or detachment due to uneven peeling force.
Weather resistance: After being tested under high and low temperatures (-20~60℃) or humidity (90% RH), the change rate of release force is ≤15% (e.g., the release paper of adhesive tape used outdoors needs to be resistant to aging).
2. Surface flatness: The surface roughness is ≤5μm, ensuring uniform adhesion to viscous materials (without bubbles), making it particularly suitable for high-precision bonding in the electronics industry (such as mobile phone screen protectors).
Cleanliness: The number of surface dust particles (>0.1mm) should be no more than 3 particles per square meter, and there should be no oil stains or hair clippings (to avoid contaminating viscous materials, such as sterile release paper for medical tape).
3. Mechanical properties: Tensile strength: Longitudinal tensile strength ≥ 3kN/m (for kraft paper substrate), to avoid fracture during processing (such as die-cutting); Bursting strength: ≥ 150kPa, to prevent damage due to compression during packaging or transportation, which could lead to contamination of adhesive materials.
4. Temperature and Chemical Resistance: Ordinary silicone release paper can withstand temperatures up to 120℃, while fluorine-based release paper can withstand temperatures ranging from 200-300℃ (suitable for hot pressing of composite materials). Solvent Resistance: After exposure to solvents such as alcohol and acetone, the release layer does not peel off (e.g., protection during cleaning of electronic components).