Hollow Blow Molding Process

Precision Technology｜OEM & Custom｜Multi-Industry Applications

Manufacture

  1. HOME
  2. Manufacture
  3. Forming

Types of Hollow Blow Molding

  • Extrusion Blow Molding
    The most common hollow blow molding method, suitable for producing large hollow products.
  • Injection Blow Molding
    A preform is first produced by injection molding, then blow molded. 
    This method is suitable for producing high-precision and high-quality hollow products.
  • Stretch Blow Molding
    The preform is stretched before blow molding, which increases product strength and transparency.
    This method is commonly used for producing bottles and similar products.

  • Feeding
    Plastic pellets or powder are fed into the hopper.
  • Plasticizing & Extrusion
    The material is heated and plasticized by the screw inside the barrel, transforming into molten plastic.
  • Parison Extrusion
    The molten plastic is extruded through the die head of the extruder, forming a hollow tubular parison.
  • Mold Closing
    The parison is clamped into a pre-designed mold. The mold closes, isolating the parison from the extruder.
  • Blowing
    High-pressure air is blown into the parison, expanding it against the inner wall of the mold to form the desired shape.
  • Cooling & Shaping
    The cooling system within the mold solidifies the plastic into its final shape.
  • Demolding
    The mold opens, and the finished plastic product is removed.
  • Trimming
    Excess flash or edges are removed from the product.
  • Inspection
    Dimensional checks, leak tests, and other inspections are carried out to ensure product quality.
Fin.
BACK
TOP