Blow Molding

What Type of Parts are Good Candidates for Blow Molding

Blow Molding was in part created due to Glassblowing, but geared towards plastic materials. The process was invented in the late 30's. The popularity of Blow Molding took off partly because of plastic bottled drinks in the 70's. This new form of packaging drinks caused a surge in the demand for blow molded products. Many everyday items that a routinely used are manufactured by the Blow Molding process. Some other parts created by Blow Molding would be the thin hollow tubes, teacups, trash cans, and bowls amongst a variety of other everyday items.

Designing Parts for Blow Molding

Blow molding, which is also known as Blow Mounding or Blow Forming is the process in which objects obtain their hollow shape. An example of this would be a cupcake pan. To get the hollow center of the pans shape, the material of the pan has to be molded. Various materials can be molded into shapes with one of the three forms of blow molding. These forms are known as Extrusion Blow Molding (EBM), Stretch Blow Molding (SBM), and Injection Blow Molding (IBM). Extrusion Blow Molding is the process in which a straw like shape is clamped on both ends with a small hole at one of the ends. Air is blown into the end with the hole until the desired shape is achieved. Stretch Blow Molding is the process in which products such as juice bottles are created. A straw is placed inside of the object and blown to the desired size. The process of Injection Blow Molding is usually reserved for large production or small fragile items, such as the glass medical tubes.