Parison analysis

This expression therefore enables the thickness of the moulded article to be calculated from a knowledge of the die dimensions, the swelling ratio and the mould diameter. The following example illustrates the use of this analysis. A further example on blow moulding may be found towards the end of Chapter 5 where there is also an example to illustrate how the amount of sagging of the parison may be estimated. 

While in the analysis of the drug abuse situation and drug abuse trends all these indicators were considered, when it came to provide a global com parison a choice was made to rely on the one key indicator that is most available and provides an idea of the magnitude for the drug abuse situation annual prevalence among the population aged 15 to 64. 

PITA parison inflation thinning analysis PO polypropylene oxide... 

The first step in the Pro/Mechanica steady state thermal analysis is to supply the boundary conditions i.e. the temperature values in the mould. The die cavity resembles the shape of the bottle. The parison is formed by extrading the melted plastic through a die. Since the parison is inflated to form the shape of the bottle, the plastic will be in direct contact with the mould. So the temperature of the mould surface will be eqital to the temperature at which the plastic melts. Data from the blow moulding machine show that the plastic melts at a temperatirre of 190°C. So this temperatme of 190°C is... 

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