Blow Molding

{
  "id": "MLC-T-ENV-003474",
  "term": "Blow Molding",
  "field": "Environment",
  "definition": "Blow molding is used to manufacture bottles and other hollow or lightweight objects. The basic technique of blow molding is to stretch and form plastic material against a mold, usually by air pressure. The extrusion blow molding method extrudes fluid plastic into a parison (a free-blown form shaped like a tube) before molding the final product. The parison is directed between two halves of a mold, then air pressure expands the parison and forces it to conform to the contour of the mold. The injection blow molding method is similar to extrusion blow molding, except that the parison is injection-molded rather than extruded.",
  "references": [
    "EPA Preferred and Alternative Methods for Estimating Air Emissions from Plastic Products Manufacturing at http://www.epa.gov/ttnchie1/eiip/techreport/volume02/ii11.pdf"
  ],
  "url": "https://mlchart.com/terminology/environment/blow-molding/"
}