Abstract A convolutely wound tube having a portion adjacent the inside edge thereof more pliable than the remainder thereof for easily conforming to the contour of the inside surface thereof and method for making same from a predetermined length of elongate sheet material having opposed first and second surfaces and first and second longitudinal side edges, wherein the method includes mechanically deforming a minor portion of the sheet material adjacent the first longitudinal edge thereof to render same more pliable than the major portion of the sheet material, convolutely winding a predetermined length of the elongate sheet material transversely of the length into a convolute tube while forming the inside edge of the tube from the first longitudinal edge of the sheet material so that the pliable portion of the sheet material adjacent the inside edge will readily conform to the contour of the inside surface of the convolute tube, and securing the convolute tube in the wound condition.
A convolutely wound tube formed from a predetermined length of elongate sheet material having opposed surfaces and longitudinal side edges, said tube comprising a plurality of overlying convolute windings of the sheet material including inside and outside surfaces and edges formed by the opposed surfaces and the longitudinal edges of the sheet material, adhesive means for securing said convolute windings in the overlying relation and for securing said inside edge to the next outer convolute winding, a minor portion only of the sheet material adjacent said inside edge of said tube including longitudinally extending corrugations rendering the sheet material more pliable than the major portion thereof and readily conformable to the contour of said inside surface of said convolute tube, and said minor portion of the sheet material having said corrugations therein comprising width substantially less than the circumference of the inside surface of said tube.
Claim 2
Dependent Claim
146 words
A convolutely wound tube formed from a predetermined length of elongate sheet material having opposed surfaces and longitudinal side edges, said tube comprising a plurality of overlying convolute windings of the sheet material including inside and outside surfaces and edges formed by the opposed surfaces and the longitudinal edges of the sheet material, adhesive means for securing said convolute windings in the overlying relation and for securing said inside edge to the next outer convolute winding, a minor portion only of the sheet material adjacent said inside edge of said tube including longitudinally extending corrugations rendering the sheet material more pliable than the major portion thereof and readily conformable to the contour of said inside surface of said convolute tube, and said minor portion of the sheet material having said corrugations therein comprising width substantially less than the circumference of the inside surface of said tube.