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CO-EXTRUSION

Versatile solutions and materials. Lower costs.
Highest quality. Clean environment.

Co-extrusion allows for more than one material to be extruded. The advantage is that, on the one hand, recycled plastic can be reused to create a circular economy for plastics. On the other hand, different formulations and materials can be processed. Our customers’ demanding needs can thus be satisfied both from a financial and technical standpoint.

Typical applications for co-extrusion include:

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Bay post
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Window casement
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Frame extension
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Glazing bead
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Bay profile
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Panel
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Overlapping casement profile
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Rain gutter
LAYER.COEX plus | Co-Extrusion - Greiner Extrusion

LAYER.COEX plus

  • 55–65% core material content
  • Thick-film technology: Coating is up to 75% of the wall thickness of the profile
  • Core material either from main extruder or co-extruder
  • Mixed regrind can be used

 

18% in cost savings (compared to mono extrusion)

COMBI.COEX | Co-Extrusion - Greiner Extrusion

COMBI.COEX

  • About 50% core material content
  • Combination of thin-coat and solid-wall technology
  • Core material either from main extruder or co-extruder
  • Mixed regrind can be used

 

14% in cost savings (compared to mono extrusion)

LAYER.COEX | Co-Extrusion - Greiner Extrusion

LAYER.COEX

  • 60–70% core material content
  • Thin-film technology: Coating is up to 33% of the wall thickness of the profile
  • Core material from main extruder
  • The use of single-variety regrind is recommended

 

13% in cost savings (compared to mono extrusion)

CORE.COEX | Co-Extrusion - Greiner Extrusion

CORE.COEX

  • 35–45% core material content
  • Solid-wall technology
  • Core material from co-extruder
  • Mixed regrind can be used

 

10% in cost savings (compared to mono extrusion)

Technische Profile | Co-Extrusion - Greiner Extrusion

Technical profiles

Co-extrusion is also used in technical profiles. Up to 5 different materials can be combined, including the following:

  • PVC
  • PP
  • PE
  • PC
  • ABS
  • PMMA
  • WPC
  • Glass-fibre compounds (such as ULTRADUR© by BASF)

Core materials for co-extrusion

Kernrezeptur | Co-Extrusion - Greiner Extrusion

Core formulation

Core formulations are less expensive blended materials, usually with more fillers (CaCo3) and fewer stabilisers – and well suited for the profile interior.

Sortenreines Mahlgut | Co-Extrusion - Greiner Extrusion

Single-variety regrind

Single-variety regrind (plastics with uniform markings according to DIN EN ISO 11469 or VDA 260) is obtained from grinding plastic profiles.

Gemischtes Mahlgut | Co-Extrusion - Greiner Extrusion

Mixed regrind

The most affordable regrind from different ground plastic profiles that have chemical compatibility (different colours, different materials).

Regranulat | Post Co-Extrusion - Greiner Extrusion

Regranulate

Regranulate is produced via a melting process, also known as compounding; additives are added to improve properties and it is ideally suited for the co-extrusion process.

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