Parison programming

A different problem occurs when the bottle has vertical rather than horizontal asymmetries, such as bottles with narrow waists or wide shoulders. In such cases, a one-time change in the die dimensions cannot produce even wall thickness. The solution is to provide the ability to change the die dimensions as the parison is being produced, so that a thicker profile is produced for the part of the parison that forms the wider part of the bottle, and a thinner profile where the bottle is thinner. This technique is called parison programming. 

Why might you want to use parison programming die shaping Can both be used together Why would you want to do so ... 

Various techniques are used to introduce air. It can enter through the extrusion die mandrel (as with most pipe lines. Chapter 3), through a blow pin over which the end of a parison has dropped (Fig. 4-1), or through blowing needles that pierce the parison. The wall distribution and thickness of the blown part are usually controlled by parison programming, the blow ratio, and part configuration. 

Electronic parison programming is an effective way to control material usage and improve both quality and productivity. The most common method used is orifice modulation (Fig. 4-4). The die is fitted with a hy-... 

Fig. 13.15 is an example of parison programming to produce an irregular shaped detergent container. 

Blow molding parison programming In extrusion blow molding bottles and containers of complex geometry are produced. To compensate for the variation in bottle geometry and... 

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