In addition to considering its excellent open anti-sticking effect, the selection of silp and anti-blocking masterbatch mainly includes the following points:
(1). Optical properties: To obtain the best transparency and the lowest haze, the opening slip agent must use a refractive index and resin similar (1.49), narrow particle size distribution, suitable particle size, the amount of addition can achieve the desired effect.
(2). Dispersibility: The particle size of the anti-blocking agent is critical. Smaller size, the better the dispersion. The large particle size will affect the apparent and optical properties of the film. The particle size of the anti-blocking agent is generally 2-10 microns. Masterbatch producers need to have highly dispersed twin-screw units and extensive masterbatch dispersion production experience.
(3). Heat sealing and printing performance: Generally speaking，the film is corona or flame treated before heat sealing and printing to increase the surface tension and surface energy of the film, but an unsuitable amount of slip agent will migrate to the surface of the film to affect the heat sealing of the film. Printing performance, resulting in low peel strength between the film and weak ink adhesion, the film manufacturers can choose low friction coefficient, non-migrating open smooth masterbatch.