http://www.searchreslt.com/blow-mold/
how is blow moulding involved in bottle production?
describe blow moulding and how is it involved in a bottle production?
*Blow moulding or blow forming is a manufacturing process by which hollow plastic parts are formed. In general, there are three main types of blow moulding; Extrusion Blow Moulding, Injection Blow Moulding, and Stretch Blow Moulding. The blow molding process begins with melting down the plastic and forming it into a parison or preform. The parison is a tube-like piece of plastic with a hole in one end in which compressed air can pass through. The parison is then clamped into a mold and air is pumped into it. the air pressure then pushes the plastic out to match the mold. Once the plastic has cooled and hardened the mold opens up and the part is ejected. *Extrusion blow molding will feature machine component identification, parison control and HDPE-type bottle making. Injection stretch blow molding will feature machine component identification, preform control, plastic orientation and PET-E bottle making. *In Extrusion Blow Moulding (EBM), plastic is melted and extruded into a hollow tube (a parison). This parison is then captured by closing it into a cooled metal mold. Air is then blown into the parison, inflating it into the shape of the hollow bottle, container or part. After the plastic has cooled sufficiently, the mold is opened and the part is ejected. Continuous and Intermittent are two variations of Extrusion Blow Molding. In Continuous Extrusion Blow Molding the parison is extruded continuously and the individual parts are cut off by the mold. In Intermitttent or Accumulator Method, an accumulator gathers melted plastic and when the previous mold has cooled and enough plastic has accumulated, a rod pushes the melted plastic and forms the parison.
Blow Molding Video