Patent ID: 6345425
Filing Date: 2002-02-12
Classification: B21C,B21D,Y10T

Abstract:
An apparatus comprising:a scoring device including at least one scoring blade defining a non-uniform depth dimension along a length of the scoring blade for making non-uniformly deep transverse score lines on a roll of sheet material; a rollformer adapted to continuously form the sheet material into a tubular shape; a welder positioned in line with the rollformer and that is adapted to weld the tubular shape into a permanent tube; a break-off device in line with the rollformer that is adapted to break off sections of the tube at the score lines; and a dimpler for forming dimples adjacent the scoring lines; the dimpler including a dimpler punch that forms a protruding dimple adjacent each one of the scoring lines, the dimpler including top and bottom dimpler rollers having top and bottom punches, the top and bottom punches being configured to form up and down dimples in the sheet material.