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Full Record for Micrograph 584
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- Micrograph no
- 584
- Brief description
- External surface of blow-moulded HDPE
- Keywords
- alignment, blow moulding
, bottle, damage, HDPE, parison , polyethylene (PE), polymer , surface - Categories
- Polymer
- System
- High density polyethylene (HDPE)
- Composition
- Not specified
- Standard codes
- Reaction
- Processing
- A 'parison' (tube) is continuously extruded into a mould which periodically closes together with a knife, to cut suitable lengths which are then expanded to fill the mould
- Applications
- Blow moulding is a continuous process used in the manufacture of bottles as well as sheets, bags, and tubes.
- Sample preparation
- The specimen has been sputter-coated with gold, to give a conducting surface
- Technique
- Scanning electron microscopy (SEM)
- Length bar
- 400 μm
- Further information
- The surface shows periodic ridges at right angles to the flow direction. These are indicative of flow instability and a periodic slipping of the melt at the die wall. It also shows surface scratches which are typical of polymer surfaces. Hard abrasive particles, dragged across the surface, have displaced material to form grooves and ridges.
- Contributor
- J A Curran
- Organisation
- Department of Materials Science and Metallurgy, University of Cambridge
- Date
- 03/10/02
- Licence for re-use
Attribution-Non-Commercial-Share Alike 2.0 UK: England & Wales- Related micrographs