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Blow Moulding Process & Barrier Containers Part 1.5 Effect of resin properties

Blow Moulding Process & Barrier Containers Part 1.5 Effect of resin properties. Processing - Viscosity. The viscosity together with the lubrication (additives) determine: melt pressure melt fracture occurrence - bottle aesthetics. Processing – Influence of the resin.

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Blow Moulding Process & Barrier Containers Part 1.5 Effect of resin properties

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  1. Blow Moulding Process & Barrier Containers Part 1.5 Effect of resin properties

  2. Processing - Viscosity • The viscosity together with the lubrication (additives) determine: • melt pressure • melt fracture occurrence • - bottle aesthetics

  3. Processing – Influence of the resin • For an optimal processability and performance the type of grade used is important: • - rheology: processing, downgauging (swell) • solid state properties: • density • impact resistance • chemical resistance • environmental stress crack resistance • optical properties (gloss, clarity) • creep and bulging

  4. Processing Swell Do: outer diameter of die Dp: diameter of parison ho: die gap hp: thickness of parison Dp/Do: diameter swell (BD) hp/ho : thickness swell (BH) Weight swell (BA)= BD x BH if diameter >> thickness

  5. Processing: swell related problems The combination of high swell and low melt strength leads to curtaining (parison collapse) High Swell Narrow die gap Impuritysensitive High shear rates High diameter swell Die lines High hoop stress Excessive Flash Pleating Trimming problems Handle webbing

  6. Relation between bottle and resin properties Property ESCR impact resistance Stiffness(Topload) Barrier prop. Density

  7. Bottleproperty Gloss Impact resistance Abrasion resistance ESCR Relation between bottle and resin properties Melt Index

  8. Pinch-off properties Property Parison drawdown (sagging) Effect of resin properties on processing Melt index

  9. Property Bottle weight/ weight swell Output Pinch-off properties Gloss Melt temperature Effect of extrusion parameters on plastic variables

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