A new device called a Layer Sequence Repeater has been added to the Modular Disc Die technology from BBS Corp., Spartanburg, S.C. The new device takes two or three layers created by the modular discs and repeats the layers over and over in a nano-layer stack. The Layer Sequence Repeater is an independent unit inside the die. It forms the nano-layer stack and inserts it between other layers in blown film. This allows brittle barrier polymers to be used in layers so thin that they are no longer brittle, BBS reports. The company made blown film with alternating nano-layers of EVOH and Mitsui’s Admer olefinic adhesive for oxygen barrier and another film with alternating nano-layers of COC and PE adhesive resin for moisture barrier. In each film, the barrier and adhesive resins were combined into a stack of 21 nano-layers, which was inserted as if it were a single barrier layer into the middle of a 5-layer film. The film had a total of 25 layers in a structure of PE/tie/nano-layer stack/tie/PE. The EVOH nano-layer stack reportedly showed better oxygen barrier, especially after flexing, and better elongation than a conventional 7-layer barrier film with a single layer of EVOH. In a similar structure, a COC nano-layer stack showed greater elongation than a single COC layer in a standard 7-layer film. BBS will present its nano-layer-stack technology at the SPE Polyolefins 2009 Conference in Houston this month. (864) 579-3058 • firstname.lastname@example.org
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