Structural insulating Polyamide Strips have been utilized for thermally breaking aluminum extrusion assemblies for over 30 years, and have been in use in North America for over a decade. Strips are available with a variety of configurations, to meet differing performance requirements. Creating a thermal break using a Polyamide Strip system involves 3 steps :
A knurling wheel is used to produce “teeth” between 0.15 mm and 0.30 mm long in a pocket of the inner and outer extruded profiles that will be joined by the Strip to comprise the frame. These “teeth” will bite into the Strip during the crimping process and insure adequate shear strength for the composite profile.
Aluminium tooth channel must open smoothly. On the alumunium outer channel (tightened section) teeth should be more prominent and bigger , aldo wick channel depth should have more teeth and less damage.
Teeth opening disks must be unblended. These disks should change yearly if production is 50_60 tons in a month and the peeling test should be in 700_800 Kg/N.
Typically, the Polyamide Strip is pulled or pushed into the extrusion profile, using specialized equipment. However, manual insertion can also be used, and there are assembly methods that pull or push the profile onto the Strip. The preferred method is up to the installer.
Three sets of wheels rotate the extrusion onto the Strip and mechanically lock the components together. Over 1300 pounds of pressure is applied in stages, and the resulting aluminum/Strip assembly will then act as a load-bearing composite. Shear testing is typically conducted periodically to verify that the process has produced an assembly that will perform structurally as required.
In the furnace process things need to be considered is the balance profile point is well setted.
If necessary; use double aluminium profile hanger. Also the furnace heat system must be calibrate on 6 months on a row.
The aluminium profile waiting time should be 30 minutes in furnace. If the furnace temperature is above 200˚C , the aluminium profile and the polyamide may damage. After the furnace process , abrasion test must be above 250 Kg/N. if you don’t want these problems , follow these instructions.