Helically wound tubes

Claim 2

A helically wound cylindrical tube comprising: a. a helically wound liner ply; b. a helically wound body ply disposed about and adhered to said liner ply; c. said body ply having adjacent edges disposed in slightly spaced relationship to each other along a helical path; d. said liner ply including a first marginal portion along one edge and located on the inside of said tube, extending across said helical path, and adhered in overlapping relationship to liner material on one side of said path; e. said liner ply including a second marginal portion along an opposite edge from said first marginal portion, extending outward between said adjacent edges of said body ply and circumferentially beyond said helical path in an opposite peripheral direction from said first marginal portion; f. said second marginal portion of said liner being adhered to an outer peripheral surface of said body ply.

Claim 3

A tube as defined in claim 1 wherein said liner ply is substantially thinner than said body ply, and including a third ply overlying said body ply and said second marginal portion of the liner ply, and adhered to both the body ply and said second marginal portion.

Claim 4

A tube as defined in claim 1 including a moisture barrier formed of a solidified wax-containing composition covering the inner surface of said liner ply.

Claim 5

A helically wound cylindrical tube adapted for use as a container, comprising: a fiber strip helically disposed to form a tubular body ply and a relatively thin strip helically disposed and adhered to the inside of the tubular body ply to form a liner ply; said body ply having edges disposed opposite each other along a helical path and in slightly spaced relationship; said strip forming the liner ply having first and second marginal portions along parallel sides of the strip; and said liner ply completely covering the inner surface of said body ply, extending between the adjacent edges thereof to locate said first edge portion of the liner ply strip on the outside of said tubular body ply flush against the surface thereof, and said second edge portion overlapping the liner ply adjacent the helical edges of the body ply.

Claim 6

A helically wound cylindrical tube adapted for use as a container, comprising: a fiber strip helically disposed to form a tubular body ply and a relatively thin strip helically disposed and adhered to the inside of the tubular body ply to form a liner ply; said body ply having edges disposed opposite each other along a helical path and in slightly spaced relationship; said strip forming the liner ply having first and second marginal portions along parallel sides of the strip; and said liner ply completely covering the inner surface of said body ply, extending between the adjacent edges thereof to locate said first edge portion of the liner ply strip on the outside of said tubular body ply flush against the surface thereof, and said second edge portion overlapping the liner ply adjacent the helical edges of the body ply.

Claim 7

A tubular member comprised of at least first, second and third strips of material helically wound and bonded one to the next, the first strip forming an inner or liner ply, the second strip being narrower and thicker than the first and surrounding all but a first marginal porTion thereof along one edge, and the third ply surrounding the second, the pitch of the helical path of at least the first and second strips being substantially identical, opposite edges of said second strip helically disposed in opposed relationship, said first marginal portion of said first strip extending between the opposed and otherwise abutting edges of the second strip, overlying and bonded to a marginal portion of a convolution of the second strip, and a second marginal edge portion of said first strip underlying the otherwise abutting edges of said second strip in overlying relationship with and bonded to an adjacent one of its own convolutions, thereby forming a lap joint within the tube, said marginal edge portions of said first strip each extending in a peripheral direction opposite to that of the other.

Claim 8

A tubular member comprised of at least first, second and third strips of material helically wound and bonded one to the next, the first strip forming an inner or liner ply, the second strip being narrower and thicker than the first and surrounding all but a first marginal porTion thereof along one edge, and the third ply surrounding the second, the pitch of the helical path of at least the first and second strips being substantially identical, opposite edges of said second strip helically disposed in opposed relationship, said first marginal portion of said first strip extending between the opposed and otherwise abutting edges of the second strip, overlying and bonded to a marginal portion of a convolution of the second strip, and a second marginal edge portion of said first strip underlying the otherwise abutting edges of said second strip in overlying relationship with and bonded to an adjacent one of its own convolutions, thereby forming a lap joint within the tube, said marginal edge portions of said first strip each extending in a peripheral direction opposite to that of the other.