company news about How to make PVA water soluble film?

Raw Materials Preparation:

• Main ingredient: Polyvinyl Alcohol (PVA) resin

• Plasticizers (e.g., glycerin, sorbitol) – for flexibility

• Additives (e.g., surfactants, colorants, stabilizers) – optional

Solution Preparation:

• PVA resin is mixed with water and plasticizers

• Heated to around 85–95°C to fully dissolve

• Mixed until a uniform viscous PVA solution is formed

Casting or Extrusion:

• Casting method: The PVA solution is cast onto a heated belt or drum, forming a thin film

• Extrusion method: Melt-processing via twin-screw extruder, forming film through a T-die

Drying:

• The wet film is passed through drying ovens (around 50–90°C)

• Water is evaporated, and a dry film is formed

Cooling and Winding:

• The film is cooled and then wound into rolls

• Thickness is typically controlled between 15–60 microns

Cutting and Packaging:

• Rolls are slit to desired width

• Film is sealed in moisture-proof packaging to avoid premature dissolving