parison swell

parison swell

[′par·ə·sən ‚swel]
(engineering)
In blow molding, the ratio of the cross-sectional area of the parison to that of the die opening.
References in periodicals archive ?
This certainly will affect parison swell and the total amount of flash.
Depending on the PET resin and processing conditions, correction of size may be needed to accommodate a different parison swell and die swell.
Normally, larger tooling diameters have smaller parison swell. Small tooling produces a larger percentage of swell.
Parison swell and sag are factors that significantly influence the parison dimensions, and are strongly affected by die geometry, resin characteristics, and operating conditions.
The control of parison swell is the first criterion for a successful product in extrusion blowmolding.
The most common representation of the parison swell is in terms of the diameter swell ([B.sub.1]) and the thickness swell ([B.sub.2]) defined as
A number of different methods have been employed in the past to measure the parison swell. The earliest studies of parison swell made use of the pinch-off mold originally proposed by Sheptak and Beyer [3].
The parison swell (diameter and thickness) decreased with increasing fiber content.
The parison swell for the individual segments is modeled using semi-empirical equations.
We have evaluated the parison swell as a function of time after emerging from the die.
Parison swell was calculated using the extrudate swell and residual stress obtained in region (I) as initial conditions.
Parison swell behavior can be characterized in terms of the weight swell, [S.sub.w], diameter swell, [S.sub.D], and thickness swell, [S.sub.T]: