Some Other Methods of Manufacturing Inhibited Films

5 Some Other Methods of Manufacturing Inhibited Films 

Slot extrusion is used to form flat inhibited films and laminated films. To this end, flat co-extrusion, extrusion pasting and lamination methods are used [7,14,18,28,34,40,82]. Commonly, preliminary granulated mixtures of film-forming pol3miers and Cl participate in extrusion. To avert foaming of the melt by VCI vapors, adsorbents like silica gel [7] are introduced into the polymer composition. 

A scheme of appl3dng an inhibited coating in a polymer melt onto the film base by extrusion lamination [34] is illustrated in Fig. 2.13. A similar procedure is employed at Cortec and Northern Instruments Co. for paper production with a laminated layer of inhibited PE. 

A special setup is used for manufacture of a three-layered inhibited film whose middle layer is embossed and the cells are filled with a non-drying inhibiting composition (Fig. 2.14). The setup consists of extruders 1 with slot heads 3, vacuum-forming drum 4 and Cl batcher 2 [4,83]. The film blank is directed by guide rollers 5 and 6 to the assembly unit of the laminated material equipped with a heat chamber 7. 

Pol3uner films produced by slot extrusion are homogeneous and have even thickness, which is an important factor for modification by a structural 

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