Condale Plastics - Specialist Plastic Extruders    
 
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Plastic Extrusion Design -
Flexible and Co-extruded Profiles

These are design points to ensure cost-effective, consistent good quality plastic extrusions. Thermoplastic extrusion is a continuous process, relying on calibrating (or forming) after the plastic material has passed through the die, to form and define the profile, as the plastic is cooled and turned from liquid to solid. We can advise on the suitability of the thermoplastic material, such as PVC, PETG or Polycarbonate.

Flexible plastic profile design follows the same rules as rigid profile design, with the following exception:
Sketch: extrusion wall thickness for rigid profiles   Flexible profiles
Sketch: extrusion wall thickness for rigid profiles O Wall thickness
Sketch: extrusion wall thickness for rigid profilesThe wall of a flexible plastic profile may vary if necessary, as the process of extruding flexible plastic profiles is more akin to aluminium extrusion, and the plastic profile is supported rather than formed while cooling.
Sketch: extrusion wall thickness for rigid profiles   Co-extruded profiles
Sketch: hollow extrusions for rigid profiles O Rigid/flexible co-extrusion
Sketch: hollow extrusions for rigid profilesTo achieve a dual hardness plastic co-extrusion, two machines are used to feed the separate materials through the same die. For the tooling to be achievable, co-ex designs should only include one or two points of a flexible material welded to a rigid main section. A variation on the theme may be where two rigid plastic profiles are joined with a single flexible web to form a hinging profile.
Sketch: hollows within hollow rigid profiles O Two-colour co-extrusion
Sketch: hollows within hollow rigid profilesThis process is typically used for epos (electronic point of sale) ticket sections. A coloured back, which attaches to the shelf edge is extruded with a thin clear cover to protect labelling. A maximum of two clear portions is advised.
 

 
  
             
Copyright Condale Plastics Ltd. 2008 - Specialists in thermoplastic extrusion

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