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Method of Duct Fabrication to Reduce Film Delamination Disclosure Number: IPCOM000209437D
Publication Date: 2011-Aug-04
Document File: 3 page(s) / 46K

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The Prior Art Database


This submission documents a proposed solution to prevent the delamination of a reflective film from the gore groove of a daylighting duct.

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Method of Duct Fabrication to Reduce Film Delamination


This article discusses a possible method of duct fabrication that could reduce the occurrence rate of a laminated film delamination at a gore groove. A gore groove is the location where two pieces of a duct mate and can be twisted to achieve various angles. The gore groove is made by deforming the duct as shown in figure 2. This deformation causes high stress levels in the laminated duct. The layers can delaminate due to this stress.


With the above background in place, the improved techniques will now be
described. A duct is formed by roll lamination of various materials including a reflective film (~ 3.5 mils), a metal sheet (primed aluminum ~16 mils), and an adhesive (~ 1 mils) see figure 1. Once laminated, the duct is cut and bent to form a circular duct section. Some sections are gored along one or two edges to form a recessed trough into which a second section lies. This creates a connection allowing the duct sections to twist independently of each other. This gives the ability to create custom corner angles. At some infrequent but persistent level, the laminated film pops out of (delaminates from) the gore groove either wholly or partially resulting in a cosmetically undesirable defect (see figure 3).

The proposed solution to gore groove film delamination is to reduce the stress in the film. A possible solution is a modification of the goring tool to incorporate a rotary blade c...