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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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Presentation Transcript
slide1

Blow Moulding Process

& Barrier Containers

Part 1.5 Effect of resin properties

slide2

Processing - Viscosity

  • The viscosity together with the lubrication (additives) determine:
    • melt pressure
    • melt fracture occurrence
    • - bottle aesthetics
slide3

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
slide4

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

slide5

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

slide6

Relation between bottle

and resin properties

Property

ESCR

impact resistance

Stiffness(Topload)

Barrier prop.

Density

slide7

Bottleproperty

Gloss

Impact resistance

Abrasion resistance

ESCR

Relation between bottle

and resin properties

Melt Index

slide8

Pinch-off properties

Property

Parison drawdown

(sagging)

Effect of resin properties

on processing

Melt index

slide9

Property

Bottle weight/ weight swell

Output

Pinch-off properties

Gloss

Melt temperature

Effect of extrusion

parameters

on plastic variables