Container seam and a process for forming a container seam

Claim 2

A process for assembling a container body and a bottom therefor by forming a triple seam between the body and the bottom of the container comprising the steps of: (a) forming a hook-shaped profile in the edge of the body of the container; (b) superposing a bottom edge of the bottom of the container over the hooked edge of the body of the container; (c) flanging a terminal part of said body subsequent to the step of forming the hook-shaped profile in the body edge; said body edge having: (i) the hook-shaped profile with a generally axially extending terminal part; and (d) rolling the bottom and body edges around each other to form a triple seam having more than five layers of adjoining material.

Claim 3

A process for assembling a container body and a bottom therfor by forming a triple seam between the body and bottom of the container comprising the steps of: (a) forming a hook-shaped profile in the edge of the body of the container; (b) superposing a bottom edge of the bottom the the container over the hooked edge of the body; (c) flanging a terminal part of said body subsequent to the step of forming the hooked-shaped profile in the body edge, said body edge having: (i) the hook-shaped profile with a generally axially extending terminal part (20), and (ii) an annular depression (26) radially inside said hook-shaped profile; and (d) rolling the bottom and body edges around each other to form a triple seam having more than five layers of adjoining material.

Claim 4

A process for assembling a container body and a bottom therfor by forming a triple seam between the body and bottom of the container comprising the steps of: (a) forming a hook-shaped profile in the edge of the body of the container; (b) superposing a bottom edge of the bottom the the container over the hooked edge of the body; (c) flanging a terminal part of said body subsequent to the step of forming the hooked-shaped profile in the body edge, said body edge having: (i) the hook-shaped profile with a generally axially extending terminal part (20), and (ii) an annular depression (26) radially inside said hook-shaped profile; and (d) rolling the bottom and body edges around each other to form a triple seam having more than five layers of adjoining material.

Claim 5

A process according to claim 2 wherein the hook-shaped profile is formed by means of a chuck and of a roll having complementary profiles.

Claim 6

A process according to claims 2 or 3 wherein prior to the flanging step the hook-shaped profile includes: (a) forming a root branch extending toward the inside of the body; and (b) forming a terminal branch extending away from the inside of the body.

Claim 7

A process according to claims 2 or 3 wherein the body edge is driven down by means of a press.

Claim 8

A process for assembling a container body and bottom therefor by forming a triple seam between the body and the bottom of the container comprising the steps of: (a) forming a hook-shaped profile in the edge of the body of the container; (b) forming a flange on said body; (c) forming an annular depression in said flange between the hook-shaped profile (19) and a portion of the flange connecting the flange to an unaltered portion of the body; (d) superposing a bottom edge of the bottom of the container over the hooked edge of the body; and, (e) rolling the bottom and body edges around each other to form a triple seam having more than five layers of adjoining material.

Claim 9

A process for assembling a container body and bottom therefor by forming a triple seam between the body and the bottom of the container comprising the steps of: (a) forming a hook-shaped profile in the edge of the body of the container; (b) forming a flange on said body; (c) forming an annular depression in said flange between the hook-shaped profile (19) and a portion of the flange connecting the flange to an unaltered portion of the body; (d) superposing a bottom edge of the bottom of the container over the hooked edge of the body; and, (e) rolling the bottom and body edges around each other to form a triple seam having more than five layers of adjoining material.

Claim 10

A process according to any one of claims 2, 3 or 6 further including the step of: (a) positioning a liquid sealant in the annular depression prior to the superposing step.

Claim 11

A process for assemblying a container body and a bottom therefor, comprising the steps of: (a) forming an axially extending seaming structure comprising a plurality of layers belonging to adjoining edges of the body and bottom, one of said adjoining edges including a first layer formed from said one edge and a contiguous overfolded second layer formed from said one edge and having an axial length less than the axial length of said first layer to increase the number of layers in a first axial section of the seaming structure; and (b) lamination rolling the seaming structure to a uniform width.

Claim 12

A process for assemblying a container body and a bottom therefor, comprising the steps of: (a) forming an axially extending seaming structure comprising a plurality of layers belonging to adjoining edges of the body and bottom, one of said adjoining edges including a first layer formed from said one edge and a contiguous overfolded second layer formed from said one edge and having an axial length less than the axial length of said first layer to increase the number of layers in a first axial section of the seaming structure; and (b) lamination rolling the seaming structure to a uniform width.

Claim 13

A process according to claim 8 wherein said first and second layers are formed on the adjoining edge of the bottom.

Claim 14

A process according to claim 8 wherein said first and second layers are formed on the adjoining edge of the body, and the forming step includes the step of forming a hook shaped profile in a terminal part of the edge of the body.

Claim 15

A process according to claim 10 wherein the hook shaped profile is formed by operation of a roll and of a chuck-plate having complementary profiles.

Claim 16

A process according to claims 10 or 11 wherein the hook shaped profile includes a root branch extending toward the interior of the body, and a terminal branch extending away from the body.

Claim 17

A process according to claims 10 or 11 wherein the edge of the body is bent outward after formation of the hook-shaped profile to form a flange.

Claim 18

A process for assembling a container body and a bottom therefor, comprising the steps of: (a) forming an axially extending seaming structure comprising a plurality of layers belonging to adjoining edges of the body and bottom, one of said adjoining edge of said body including a first layer and a contiguous overfolded second layer having an axial length less than the axial length of said first layer to increase the number of layers in a first axial section of the seaming structure; (b) forming a hook shaped profile in a terminal part of the edge of the body during said forming of said seaming structure; (c) bending the edge of the body outward after formation of the hook-shaped profile to form a flange which extends outward from an unaltered portion of a wall of the body; (d) forming an annular depression, concave toward the outside of the body in the flange between a raised portion of the hook-shaped profile and an inside edge of the flange, and, (e) lamination rolling the seaming structure to a uniform width.

Claim 19

A process for assembling a container body and a bottom therefor, comprising the steps of: (a) forming an axially extending seaming structure comprising a plurality of layers belonging to adjoining edges of the body and bottom, one of said adjoining edge of said body including a first layer and a contiguous overfolded second layer having an axial length less than the axial length of said first layer to increase the number of layers in a first axial section of the seaming structure; (b) forming a hook shaped profile in a terminal part of the edge of the body during said forming of said seaming structure; (c) bending the edge of the body outward after formation of the hook-shaped profile to form a flange which extends outward from an unaltered portion of a wall of the body; (d) forming an annular depression, concave toward the outside of the body in the flange between a raised portion of the hook-shaped profile and an inside edge of the flange, and, (e) lamination rolling the seaming structure to a uniform width.

Claim 20

A process according to claim 14 wherein the step of forming the seaming structure further includes the step of applying a sealant in said annular depression.

Claim 21

A process according to any one of claims 8, 9, 10 or 11 wherein the step of forming the seaming structure includes the steps of: (a) positioning the bottom adjacent the body; and (b) subsequently engaging an edge of the bottom, around the edge of the body, first with a rolling roll (31) and then with a laminating roll (33) having a working surface with a profile approximately parallel to a surface of a chuck-plate which supports the body and the bottom.