Method For the Production of a Can Body, and Can Body

• US 20080164241A1
• Filed: 06/17/2005
• Published: 07/10/2008
• Est. Priority Date: 06/17/2004
• Status: Active Grant

• Current Assignee: Caprosol AG
• Original Assignee: Crebocan AG
• Inventors: Boltshauser, Werner
• Granted Patent: US 9,365,344 B2
• Time in Patent Office: Days
• US Class Current: 219/121.64
• CPC Class Codes: B21D 51/26 cans or tins; Closing same in a permanent manner making outlet arrangements B21D51/38; welding or soldering B23K
• CPC Class Codes: B23K 2101/125 Cans
• CPC Class Codes: B23K 2103/04 Steel or steel alloys
• CPC Class Codes: B23K 2103/10 Aluminium or alloys thereof
• CPC Class Codes: B23K 26/282 of tube sections
• CPC Class Codes: B65D 83/38 Details of the container body pressure relief devices B65D83/70
• CPC Class Codes: B65D 83/42 Filling or charging means
• CPC Class Codes: Y10T 428/12493 Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]

Abstract

To fix a valve piece encompassing a connecting shell and a valve to a can jacket, an embodiment of a method includes a welding step in which the connecting shell of the valve piece is fastened to the can jacket as a top closing element along with the valve by laser welding. According to an embodiment, a shoulder-shaped constricted cross section is embodied on the can jacket towards the top face thereof while the border area of the closing element which rests against the shoulder is tightly pressed thereagainst and is sealingly joined to a laser seam, the top face of the can jacket lying inside the can. The method dispenses with the need to configure or fix a valve seat while eliminating the technically complex crimping step, thus also dispensing with the need for an installation used for crimping connecting shells in the filling station. The method makes it possible to produce also aerosol cans whose diameter is smaller than the diameter of a standard valve seat.

Claims

1. A method for securing a valve part with a connecting bowl and a valve to a can shell, the method comprising:

attaching the connecting bowl of the valve part, as upper closure member together with the valve, via laser welding to the can shell, wherein a cross-sectional reduction in the form of a shoulder is embodied on the can shell, toward the end face, wherein the edge region of the closure member that fits against the shoulder is pressed on tightly and is securely connected with the aid of a laser-welded connecting seam, and wherein the end face of the can shell is located inside the can.

2. The method according to claim 1, wherein the can shell and the closure member are provided on the inside with a protective layer and wherein a ring-shaped sealing material is arranged along the connecting seam, the sealing material ensuring that a continuous protective layer even after the connecting seam is formed.

3. The method according to claim 1, wherein the at least one closure member comprises a plastic inside coating on the inside and a ring-shaped, closed sealing bead, wherein following the forming of the closing seam, the sealing bead is made to flow in a melting step and the end face of the can shell that is positioned on the can inside is covered by the material from the sealing bead.

4. The method according to claim 3, wherein the laser connecting seam is also covered by the material of the sealing bead.

11. The method according to claim 2, wherein the at least one closure member comprises a plastic inside coating on the inside and a ring-shaped, closed sealing bead, wherein following the forming of the closing seam, the sealing bead is made to flow in a melting step and the end face of the can shell that is positioned on the can inside is covered by the material from the sealing bead.

12. The method according to claim 11, wherein the laser connecting seam is also covered by the material of the sealing bead.

5. A can body with closed can shell, comprising:

a valve part with a connecting bowl and a valve arranged at the end face, wherein a laser-welded connecting seam attaches the connecting bowl of the valve part, as upper closure member together with the valve, to the can shell, wherein a shoulder type cross-sectional reduction is embodied on the can shell, toward the end face, wherein the edge region of the closure member that rests tightly against this shoulder is securely connected via the laser-welded connecting seam, and wherein the end face of the can shell is positioned inside the can.

6. The can body according to claim 5, wherein the can shell and the closure member are provided on the inside with a protective coating, wherein a ring-shaped sealing material is arranged along the connecting seam, and wherein the sealing material ensures a continuous sealing layer even for the connecting seam.

7. The can body according to claim 5, wherein the at least one closure member comprises on the inside a plastic coating and a ring-shaped, closed sealing bead, and wherein the sealing bead is made to flow and covers the end face of the can shell.

8. A method according to claim 7, wherein the laser connecting seam is also covered by the material of the sealing bead.

9. The can body according to claim 5, wherein the valve part includes two differently dimensioned flow-through cross sections, and wherein a first cross section is formed for inserting the propellant gas and for discharging the product and a second cross section is formed for filling in the product.

10. The can body according to claim 5, wherein a closable filling opening is formed in the can bottom.

13. The can body according to claim 6, wherein the at least one closure member comprises on the inside a plastic coating and a ring-shaped, closed sealing bead, and wherein the sealing bead is made to flow and covers the end face of the can shell.

14. A method according to claim 13, wherein the laser connecting seam is also covered by the material of the sealing bead.