Digital BW, The Print

On 07/24/2011 07:16 PM, Lew Schwartz wrote:
> Can anyone explain the difference?
>

The lowest quality acrylic sheets are made in an extrusion process from 
molten acrylic pellets and will show stria in the sheet, less even 
surfaces, etc if compared to cast acrylic sheets. The last produced as 
in mold (between glass) polymerised acrylic that is considered the best 
optical quality plastic available. Styrene transparent sheets are always 
produced as an extrusion directly from molten styrene pellets.With 
polystyrene the optical effects are worse and its surface will scratch 
faster. Polystyrene will yellow in time and usually its optical quality 
is also reduced if it has to have more impact strength by adding other 
components. For example the ABS qualities. There are copolymeres of 
styrene and acrylic but they still do not deliver the quality of cast PMMA.

-- 
Met vriendelijke groeten,   Ernst

Try: http://tech.groups.yahoo.com/group/Wide_Inkjet_Printers/

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