Removing Material From Mandrels
My company produces biologic medical devices derived from porcine intestine. One of our product lines is cylindrical or tubular devices made by covering mandrels with the material, drying, and then removing. We continue to experience difficulty removing the tubes from the mandrels. The mandrels are hardened SS that have been electropolished. The electopolishing provides a smooth surface, but not necessarily a "slick" one. Diameters 1.5mm to 7mm. Since the devices are permanently implanted in the human body, any process materials such as lubricants must be biocompatible. So far, we have tried PTFE spray lubricant and Dow Chemical 360 medical silicone lubricant. We have also tried bead blasting the mandrels to provide an overall reduced surface area in contact with our material. What experience or suggestions do you have? Thanks in advance for any information you can provide.