Co-extrusion for the Future
			At the forefront of our new developments are advancements in the central core of the extrusion system: the die.  Our constant objective is to improve extruded film or blow molded products performance. To do this, the successful packaging supplier must have the most versatile equipment that can accommodate a vast array of potential structures at low production costs.
			

Producing co-extruded product structures with more layers results in stronger more economic structures enhancing each polymer's unique properties. Dual Spiral Systems' dies help film and blow molded product manufacturers stay ahead of the competition.
		
		
		

		

			
"Dual Spiral System" A New Co-extrusion Concept
			How do you make 10 layer film sheeting on a 5 layer die? The Dual Spiral System (DSS), is a new concept in co-extrusion 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.
		
		
		

		

			
Dual Spiral System (DSS) Co-extrusion dies
			The DSS provides a doubling of the number of layers in a die, superior streamlining and mixing of melt-flow, temperature isolation and a new standard in die design for simplicity and flexibility to add layers to the die configuration. The DSS is available from 1 to 11 layers, in die sizes of 1-55 in (25-1400mm).
			

View Results from Field Testing
		
		
		
		

		
 
		
DSS provides:
		
		
 
		
 
		

	   	
A substantial improvement to what was thought as truly modular design - each layer is essentially a two layer die producing two layer film.
   		
Polymer distribution on the face of modular disks rather than on the outside of a cylinder or cone.
		
Computer designed flow passages based on plastics engineering software that optimizes pressure and residence time, and ensures that the spiral does all the polymer distribution, leaving the die gap to be sized based on shear stress to eliminate melt fracture.
		
The entire melt flow passage from extruder adapter to the exit of the die is highly streamlined, with no sharp bends to cause dead spots, materials which were formerly difficult or impossible to run can now be successfully processed.
   		
Each spiral is fed by two ports allowing increased material and temperature homogeneity of the melt entering the spirals. These streamlined channels have a low wetted surface area resulting in better mixing without any dead spots and insuring rapid flushing.
   		
The polymer flow passages are short in order to reduce residence time resulting in less possibility of polymer degradation.
   		
Tapered module design enables ease of die assembly and ensures perfect concentricity of modules.
   		
All layers have roughly the same wetted surface area because distribution takes place on the disk's surface.
   		
Temperature isolation provides the ability to operate adjacent modules at temperature differences up to 60 °C in order to process each layer at their recommended temperatures, with minimal effect from other modules.
   		
Modular design allows adding, removing or relocating of layers with minimal effort and expense.
		
Available in one to ten layers in any configuration.
		
Increased effective tower height due to low profile modular die design.

		
		
		
		

		

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