DSS line runs Pa-6 structure at Argenplas 2000

TechFlow Inc. produced Argenplas 2000’s only blown film co-extrusion line running a three layer structure of LDPE/ADHESIVE/NYLON – 6 using a 120 mm DSS die. Nylon -6 is one of the hardest polymers to run at the best of times because of its poor melt strength and is usually not run in short runs of a few hours like it was during each day of the show. Typically it is recommended that nylon-6 be run at blow up ratios of under 2:1 because of stability problems however, Techflow was running the nylon at a blow up ratio of 4:1, without stability problems. To further complicate maters, the polyamide was a non-blown film monofilament grade, which had never been used for film extrusion of any kind. This surprised even the resin supplier Radici Plastics of Italy.

 

Of primary importance to co-extrusion film producers was the gauge deviation of the overall film and of the nylon layer by itself. The gauge deviation measuring from the highest to the lowest peak was ± 5% (2S) on 65 micron film. The nylon layer distribution by itself was determined by running the DSS without the adhesive layer. This gauge distribution did not exceed ± 6% (2S) with the nylon layer thickness at 29 microns. Finally, the DSS was run with all three layers processing fractional melt LDPE. The gauge distribution was ± 4.6% (2S) at 65 microns which left many customers in awe. These results were verified by Octagon Process Technology GmbH of Germany using their automatic off-line film thickness profiler. One of the output printouts is displayed below.

 

 

We encourage you to contact us so that we can send you a film sample verifying these results.