"I have an application where the cuff is glued to the tube and I require a smooth, tapered transition between the cuff edge and the tube.
Writing will take place over this area; that is why I need the smooth, tapered glue connection."
It is very common to use an adhesive to make a nice, smooth, tapered transition between cuff edges and the tube, or marker bands, or transitions where there is a jump from one size tube to another. A low-viscosity adhesive in the 200-600 cP range, which cures rapidly to a smooth tack-free finish, is ideal. DYMAX light-curable materials like 1120-M-UR or 204-CTH-F are often used in these types of applications. Techniques include applying the adhesive in either a vertical or horizontal position, or even at a slight upward angle to achieve the taper. If it is a horizontal or tilted orientation, rotating the shaft during application and curing with a spot system for 1-8 seconds (typical), will allow the material to cure in the proper profile without risk of the adhesive slumping or running. Typically these transitions have a max height of 2-5 mils or less. Lower viscosities will have a sharper taper, and higher viscosities will have a shallower taper. Selecting the right needle dispense tip will help control adhesive quantity and position on the catheter shaft.