Patent ID: 6036629
Filing Date: 2000-03-14
Classification: B31C

Abstract:
Process for manufacturing a cylindrical composite container having a recessed spiral groove therein and comprising the steps of:providing a mandrel having at least one recessed spiral groove cut into its surface and positioned at a predetermined angle to a longitudinal axis of the mandrel;providing desired material layers for constructing the composite container;feeding the material layers onto the mandrel while spirally-winding the material layers at a winding angle corresponding to the predetermined angle of the spiral groove in the mandrel to form a continuous tube on the mandrel;applying external pressure at the mandrel spiral groove to the continuous tube as it is being formed to force the material layers into the spiral groove for deforming the material layers to form a spiral groove in the continuous tube;cutting the continuous tube with spiral groove therein into individual container lengths; andremoving the container lengths from the mandrel.