Page 293 - Plastics Engineering
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276 Processing of Plastics
Extruder die
Ib) Cast film process
Fig. 4.28 Co-extrusion of plastic film
In most cases there is insufficient adhesion between the basic polymers and
so it is necessary to have an adhesive film between each of the layers. Recent
investigations of co-extrusion have been centred on methods of avoiding the
need for the adhesive layer. The most successful seems to be the development
