D 1 Blow Moulding Process Barrier Containers Part
( D. 1 ) Blow Moulding Process & Barrier Containers Part 1. 5 Effect of resin properties www. assocomaplast. org Assocomaplast - Centro Direzionale Milanofiori - Palazzo F/3 - 20090 Assago - Milan - Italy - tel +39 02 8228371 - fax +39 02 57512490 - e-mail: info@assocomaplast. org
( D. 2 Processing - Viscosity ) The viscosity together with the lubrication (additives) determine: - melt pressure - melt fracture occurrence - bottle aesthetics www. assocomaplast. org Assocomaplast - Centro Direzionale Milanofiori - Palazzo F/3 - 20090 Assago - Milan - Italy - tel +39 02 8228371 - fax +39 02 57512490 - e-mail: info@assocomaplast. org
( D. 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: ü density ü impact resistance ü chemical resistance ü environmental stress crack resistance ü optical properties (gloss, clarity) ü creep and bulging www. assocomaplast. org Assocomaplast - Centro Direzionale Milanofiori - Palazzo F/3 - 20090 Assago - Milan - Italy - tel +39 02 8228371 - fax +39 02 57512490 - e-mail: info@assocomaplast. org
( D. 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 www. assocomaplast. org Assocomaplast - Centro Direzionale Milanofiori - Palazzo F/3 - 20090 Assago - Milan - Italy - tel +39 02 8228371 - fax +39 02 57512490 - e-mail: info@assocomaplast. org
( D. 5 Processing: swell related problems ) The combination of high swell and low melt strength leads to curtaining (parison collapse) High Swell Narrow die gap High shear rates High diameter swell High hoop stress Pleating Handle webbing Impurity sensitive Die lines Excessive Flash Trimming problems www. assocomaplast. org Assocomaplast - Centro Direzionale Milanofiori - Palazzo F/3 - 20090 Assago - Milan - Italy - tel +39 02 8228371 - fax +39 02 57512490 - e-mail: info@assocomaplast. org
between bottle ( Relation ) and resin properties D. 6 Property ESCR impact resistance Stiffness (Topload) Barrier prop. Density www. assocomaplast. org Assocomaplast - Centro Direzionale Milanofiori - Palazzo F/3 - 20090 Assago - Milan - Italy - tel +39 02 8228371 - fax +39 02 57512490 - e-mail: info@assocomaplast. org
( D. 7 Relation between bottle and resin properties ) Bottle property Gloss Impact resistance Abrasion resistance ESCR Melt Index www. assocomaplast. org Assocomaplast - Centro Direzionale Milanofiori - Palazzo F/3 - 20090 Assago - Milan - Italy - tel +39 02 8228371 - fax +39 02 57512490 - e-mail: info@assocomaplast. org
resin properties ( Effectonof processing ) D. 8 Pinch-off properties Property Parison drawdown (sagging) Melt index www. assocomaplast. org Assocomaplast - Centro Direzionale Milanofiori - Palazzo F/3 - 20090 Assago - Milan - Italy - tel +39 02 8228371 - fax +39 02 57512490 - e-mail: info@assocomaplast. org
( D. 9 Effect of extrusion parameters on plastic variables Property ) Bottle weight/ weight swell Output Pinch-off properties Gloss Melt temperature www. assocomaplast. org Assocomaplast - Centro Direzionale Milanofiori - Palazzo F/3 - 20090 Assago - Milan - Italy - tel +39 02 8228371 - fax +39 02 57512490 - e-mail: info@assocomaplast. org
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