-
Extrusion lines on polycarb showing through
Did a job a while back flood coating 10 clear 5mm polycarb sheets in a gloss blue translucent (very light tint) these were floodcoated by hand and stacked on a bench laying flat. when the panenls were installed in the correct light and when viewed at an angle, extrusion lines which look like bow waves could clearly be seen. The client supplied the polycarb and all we did was coat it.
Has anyone else experienced issues with the extrusion lines in sheet materials affecting the face graphic? -
3 Replies
-
What was your fitting method?
Dry with a standard squeegee, dry full width in one (eg roller / superwide squeegee), wet with squeegee or wet with a window cleaner’s rubber?
In all the hundreds of back coated acrylic & polycarb panels I’ve done, never seen extrusion lines…have seen ‘swoosh’ lines where I’ve squeegeed on though – especially in things like etch fitted dry….disappears eventually unless it was a water soluble adhesive used on the cheaper films and you fitted wet – then you’re buggered as the pressure of wet squeegeeing moves it around!
Or it could just be the nastiest, reject material imaginable you were provided with.
Dave
-
David it was applied wet (just water) done it countless times before on all sorts of substrates and never experienced any issues.
The sheets were stacked on top of each other and transported to the venue then installed, the reverse on the de-rig. Its almost as if the highest points on the polycarb have contacted with the sheet above and slightly "matted" at this point? I’ve had issues when laminating cast acrylic before as this can have quite a difference in thickness when manufactured and have seen similar bow waves in very cheap foamex. the trouble is you cant see the waves in clear polycarb! If it had been a printed white vinyl being applied I doubt if anyone would have ever noticed but as it was a translucent it is very apparent.
I have got to return to the job, strip a single panel and re-apply new vinyl to prove to client its not the vinyl, its the substrate 🙁 -
With a soft squeegee…
Log in to reply.