A NEW CONCEPT IN COEXTRUSION DIES
		
		
		

		

			
Rafael J. Castillo, Dual Spiral Systems Inc., Hamilton, Ontario, Canada

		
		
		

		

			
Abstract
			     Producing coextruded product structures with more layers results in stronger more economic film structures enhancing the polymer's unique properties in combination with the reduction of the unfavorable attributes of some polymers. Coextrusion brings out the best properties of the individual polymers in the film structure.

			     This paper will present the Dual Spiral System (DSS), a new patent pending concept in coextrusion blown film and blow molding. The DSS enables processors to take advantage of the improvements brought about from adding layers without adding additional equipment costs. By dividing each individual layer into two separate layers, the enhanced structural and physical properties of each layer material can be taken advantage of. This means that a five extruder DSS die would in fact be producing a 10 layer film sheet.


		
		
	
		

		

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