4. Coextrusion

Coextrusion involves the simultaneous hot extrusion of two or more plastic sheets into flat dies, and their immediate assembly while still hot, so that they bond together.

There are several techniques and machines: multi-channel dies, single-channel dies with coextrusion distributor, tubular coextrusion.

If the different polymers are not compatible with each other, they must be coextruded with the interposition of a "coextrusion binder", which is a kind of adhesive material (adhering to the different polymers).

Thanks to their excellent adhesion to a wide range of polymers, and their excellent weldability, ethylene-acrylic ester copolymers (Lotader and Orevac from Atofina) can be used either as bonding agents in 3-layer, 5-layer or higher laminates, or as weld coats in 2-layer laminates.

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Coextrusion

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Bibliography

L'emballage sous toutes ses facettes - . CEP communications (1988).
SKEIST (I.) - Handbook of adhesives - . Reinhold, New York (1990).
Industrial...

Regulations

http://www.legifrance.gouv.fr

Food grading

Europe

Commission Directive 2002/72/EC of August 6, 2002 relating to plastic materials and articles intended to come into contact with foodstuffs.

Council Directive 82/711/EEC of 18 October 1982 laying down the basic rules...

Standardization

▪ French Association for Standardization (Afnor)

http://www.afnor.fr

• Adhesives

Hot melt adhesives – Determination of thermal stability. - ISO 10363 - (12-1992)
Packaging materials and systems for medical devices requiring sterilization – Part 10: adhesive-coated polyolefin nonwovens for the manufacture of pouches and heat-sealable...