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Plas-Pak (WA) Pty Ltd
99 Beringarra Ave
Malaga WA 6090
Australia





Glossary of commonly used terms in the plastic industry

Blow Pressure The air pressure used to form a hollow part by blow moulding.
Blow Rate The speed at which the air enters the parison during the blow moulding cycle.
Cavity Depression in a mould that forms the shape of the product to be moulded.
Cross Head A channel which changes the direction of the ‘melt’ from a horizontal flow through the extruder, to a vertical flow through an extrusion die to form the parison.
Cycle Time The period between a certain point in one cycle and the same point in the next.
Deflashing Covers the range of finishing techniques used to remove the flash (excess unwanted material) on a plastics moulding.
Extrusion The compacting of plastics material and the forcing of it through an orifice in a continuous manner.
Finish The finish is the part of a bottle that holds the cap, stopper, or closure. The area that has the threads or thread finish. A bottle and its corresponding cap(s) must have a matching finish or neck finish. For example, a 28-410 bottle must be fitted with a 28-410 closure. The first number (in this example: 28) refers to the nominal diameter measured across the inside of the cap at the opening in milimeters. The second number, 410, refers to a specific thread style. Thereafter TT = tamper tail closure; CR = child resistant closure; J/Snap = snap on lid.
Flash Extra plastics attached to a moulding along the parting line. It must be removed before the product is considered finished.
Flash Line A raised line appearing on the surface of a moulding and formed at the junction of the mould faces.
Lip The outer edge of the top of a container, intended to facilitate pouring.
Mould Seam A vertical line formed at the point of contact of the mould halves.
Parison The hollow plastics tube from which the product is blow moulded.
Recycle Ground materials from flash and trimmings which, after mixing with a certain amount of virgin material, are fed back into the blow moulding machine.
 Silk Screening Silk screening is the method of printing where ink is forced through a photographically treated screen onto the container/closure to be decorated. 

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