The plastic resin pellets are melted and forced through the head tooling, forming a continuously extruding hollow tube called a parison. This tube is captured between two mold halves and pulled aside to the blow station. The blow pins are inserted into the top of the molds, compressed air is blown into the plastic tube, forcing it to expand to the sidewalls of the mold, which are cooled by water lines running through the mold halves. The mold opens and the fully formed bottle is dropped out of the mold with the excess plastic (a moile at the top and a tail from the bottom) removed.
A method of fabrication in which a hollow plastic tube (parison) is forced into the shape of the mold cavity by internal air pressure. Post finishing of the product is required.
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