Transport & Manufacturing
Blow Molding Parison Sag & Bottle Wall Thickness Sizer
Calculate blow molding parison sag & bottle wall thickness using the stated engineering or scientific relationship and adjustable field inputs.
Preparing your result…
What this calculator does
Calculates Blow Molding Parison Sag & Bottle Wall Thickness Sizer using the formula verified against the cited source.
What your result means
An estimate from the inputs you enter, within the scope stated below — not advice.
Formula
Thin-wall volume balance: final wall ≈ parison wall ÷ (circumferential stretch × axial stretch), circumferential stretch = bottle ÷ parison diameter
The step-by-step working for your own numbers appears with the result above and in the PDF report.
Frequently asked questions
Symbols and assumptions
- Inputs
- The values entered in the fields above
- • Thin-wall incompressible stretch balance: final wall≈initial wall/(circumferential stretch×axial stretch). The supplied t_final=t_parison×Dparison/Dbottle is the restricted axial-stretch=1 case.
Sources and review
Reviewed 2026-10-18 · Next review 2027-04-18
- • Derived local material-volume conservation. It cannot predict parison sag or realistic bottle wall distribution: axial stretching, temperature/viscoelastic behavior, die swell, gravity/time, local geometry and parison programming matter. Label the no-axial-stretch approximation and remove the sag prediction, or add the missing model.
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
Quick reference
| Scenario | Parison wall thickness (mm) | Parison diameter (mm) | Bottle diameter (mm) | Average blown wall thickness |
|---|---|---|---|---|
| Worked example | 3 | 40 | 90 | 1.3333 mm |
| Half the amounts | 1.5 | 20 | 45 | 1.3333 mm |
| Double the amounts | 6 | 80 | 180 | 1.3333 mm |
Need the full picture? Get the detailed PDF report with charts, tables, formulas and working steps.
Reviewed 2026-10-18 · Next review 2027-04-18
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