Spacer tube
A tubular hollow profile, particularly a spacer tube for the production of spacer frames for insulated glazing, has a profile wall. The profile wall is configured to be double-walled and has an outer wall made of metal, particularly stainless steel or aluminum, and an inner wall made of plastic, which are connected with one another, preferably in firm, i.e. non-displaceable manner. A device and a method for production of the hollow profile are also provided.
1. A spacer tube for the production of spacer frames of insulated glazing being a tubular hollow profile comprising a double-walled profile wall having a closed outer wall and an inner wall connected to said closed outer wall, said closed outer wall being made of metal and said inner wall being made of plastic, wherein said closed outer wall has a wall thickness of 0.04 mm to 0.1 mm and said inner wall has a wall thickness of 0.15 mm to 0.5 mm,
wherein the double-walled profile wall is produced by rolling deformation of a metal strip coated with a plastic strip, the metal strip having two lateral longitudinal edges that are adjacent to one another after rolling deformation, and
wherein the spacer tube is welded in a longitudinal direction in a region of the two lateral longitudinal edges of the metal strip by a longitudinal weld seam.
2. The spacer tube according to claim 1 , wherein the closed outer wall and the inner wall are connected with one another in non-displaceable manner.
3. The spacer tube according to claim 1 , wherein the two longitudinal edges are bent around to form flange cheeks, and
wherein the longitudinal weld seam welds said flange cheeks to one another or the longitudinal weld seam is configured as an overlapping weld or as a butt weld.
4. The spacer tube according to claim 1 , wherein the inner wall and the closed outer wall are glued to one another.
5. The spacer tube according to claim 4 , wherein the closed outer wall and the inner wall are glued to one another using a hot melt melting adhesive.
6. The spacer tube according to claim 1 , wherein the closed outer wall has a wall thickness of 0.05 mm to 0.08 mm.
7. The spacer tube according to claim 1 , wherein the inner wall has a wall thickness of 0.3 mm.
8. The spacer tube according to claim 1 , wherein the plastic of the inner wall has biopolymers.
9. The spacer tube according to claim 1 , wherein the plastic of the inner wall is at least one of a degradable plastic and a plastic made from renewable resources.