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Blow Molding. MFG 355. Extrusion Blow Molding. Basic Blow Molding Extrusion Head. Circular Blow Molding Machine. Extrusion Blow Molding. Parison. Mold Open. Mold Closed. Pressurization of Parison. Mold Open. Cooled Part. Extrusion Blow Molding. Click frame to start video.

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Presentation Transcript
extrusion blow molding5
Extrusion Blow Molding

Parison

Mold Open

Mold Closed

Pressurization of Parison

Mold Open

Cooled Part

extrusion blow molding6
Extrusion Blow Molding

Click frame to start video

injection blow molding
Injection Blow Molding

Click frame to start video

injection blow molding8
Preform is injection molded

Preform is placed in the blow molding machine

Preform is heated

Preform is pressurized

Part is removed

Injection Blow Molding

PET Preform

molds and dies
Molds and Dies
  • General die and mold considerations (for injecting the preforms)
    • Tool steel
    • Multicavity
preform formation
Preform Formation
  • Material placement
  • Stretch optimization
general mold considerations for the mold in which the part is blown
General Mold Considerations (for the mold in which the part is blown)
  • Blow molding is lower pressure that injection molding
    • Blow molding molds don’t have the strength requirements
      • Aluminum molds are most common
      • Machined or cast
  • Venting
  • Symmetry
plant concepts

Needs to be

removed

Photo Courtesy of Phillips Petroleum Company

Plant Concepts
  • No extensive cooling needed
  • Scrap removal and handling important
material considerations
Material Considerations
  • Most thermoplastics can be blow molded (in theory)
    • High melt strength is necessary
  • Polyolefins are the easiest to process
  • PVC is temperature sensitive
  • Some materials require Coblow-Molding
shapes
Shapes
  • Basically hollow
  • Typically of a cubic or cylindrical shape
  • Bottles, barrels, tanks, ducts, trash carts, flower pots, double wall cases (for tools), and toys
  • Care must be taken to not have corners that are too thin
  • Threads for caps are typically not of the highest tolerance
  • Handles can be made using pinch points in the mold
shapes18

Mold Diameter

Blow Ratio=

Parison Diameter

Shapes