The Light  Distribution Tube (LDT) is made with a multi-ply combination of polycarbonate films.  It has an ever increasing curved, wedge-like light distribution surface (LDS) that reflects and scatters the collimated light from the light source out of the tube.  The interior and exterior films have a protective hard coat, shielding them from exposure to ultra-violet radiation, providing a high degree of abrasion resistance and protecting the tubes from numerous chemicals.  These films are rolled into tubes and bonded permanently along their longitudinal seam.

ASSEMBLY PROCESS DESCRIBED:

1. Assemble poly cardonate film laminates with 3M VHB tapes "in the flat".

2. Secure the VHB tape seams to precisely align laminates.

3. Remove the VHB tape liner to bond film laminates.

4. Press assembled film structure down into a forming jig.

5. Roll film structure to create tube and secure joint temporarily to insure alignment.

6. Remove VHB tape liner to create permanent tube structure.

7. End view of a finished tube structure showing the curved LDS inside.