EVAL™ Processing / Flexible / Coextrusion Orientation

Coextrusion Orientation

Multilayer barrier films can be produced with the coextrusion orientation technologies such as the double-bubble or the tenter process. Different resins supplied from a number of extruders are bonded together through a multimanifold circular or flat die. The melted polymers are quenched into cold water before being reheated and bi-axially oriented. For the production of multilayer coextrusion oriented films, polyethylene, EVA or nylon can be used in combination with EVAL™ copolymers. The films will have shrink properties if no thermosetting is applied.

Using the double-bubble process for the production of bi-oriented films, shrinkable or not, composed of EVAL™ resins, requires a thorough technical knowledge. This process also has much correlation with the other bi-orientation tenter process. As with any set of operating parameters, the information presented herein cannot be considered absolute. However, it does contain general procedures and recommendations that should provide some guidelines for an effective operation.

EVAL™ resins for coextrusion orientation

The stretching conditions of EVAL™ resins vary depending on the ethylene content and the degree of crystallinity of the raw film. Taking this into account, the EVAL™ G156B, SP292 and E105B resins can be processed by blown film coextrusion orientation.

Click on the underlined grades in the table below to see the datasheets:






Ethylene Content






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