Patent EP-2384886-A1 (EP)
Inventor: KEIENBURG GUENTER
IPC: B32B27/10
Filed: 2011-02-25
Abstract: The beverage can (1) comprises a casing closed by bottom- and cover-elements, where the casing consists of a parallely wrapped laminate from cellulose containing material such as cardboard, and a multilayer film arranged in a region of an inner sheath surface. The multilayer film contains a barrier and/or barrier layer, and has a total thickness of 80-100 mu m, where a thickness portion of a layer based on the total thickness of the multilayer film is 8-12%. The layer on both sides is completely embedded between polyolefin layers such as polyethylene-layers. The beverage can (1) comprises a casing closed by bottom- and cover-elements, where the casing consists of a parallely wrapped laminate from cellulose containing material such as cardboard, and a multilayer film arranged in a region of an inner sheath surface. The multilayer film contains a barrier and/or barrier layer, and has a total thickness of 80-100 mu m, where a thickness portion of a layer based on the total thickness of the multilayer film is 8-12%. The layer on both sides is completely embedded between polyolefin layers such as polyethylene-layers, where a metal foil is integrated into the casing, which contains the layers from cardboard, and the metal foil is introduced between two layers. The metal foil is a stainless steel- or aluminum film having a thickness of 15-20 mu m. The layer consists of a material. An overlap width in the range of the casing of the laminate lies in the range of 10-15 mm. The laminate is wrapped and/or coated on the outside in the range of overlapping-edges strips on both sides having an adhesive film on the basis of polyethylene such as high-density polyethylene. The overlapping-edges strips of the laminate are connected itself by heat-bonding or ultrasonic welding. The multi-layer film at its inner- and outer-side has the layers made of high-density polyethylene, and the proportion of the layer based on the total thickness of the multilayer film is 10-18%. The multilayer film in a direction of an inner wall to an outer wall of the casing comprises an inner high-density polyethylene-layer, a polyethylene-layer, an ethylene vinyl alcohol-layer, a polyamide-layer and an outer high-density polyethylene-layer, where the ethylene vinyl alcohol-layer is embedded between the polyethylene-layer having the weight in the range of 14-16 g/m 2>, and a polyamide/polyethylene-surly-layer having the weight of 3-6 g/m 2>. The casing has the layers made of cardboard such as bleached and/or unbleached sulfate board having the total weight in a magnitude of 350-420 g/m 2>, and has four cardboard layers with a basis weight of 75-125 g/m 2>, and an adhesive layers are provided between the cardboard layers and the metal film on the basis of the polyamide/polyethylene (19-21 g/m 2>) or linear low-density polyethylene (14-16 g/m 2>) or Polyethylene terephthalate (13-17 g/m 2>). The casing is provided on an outer layer of the cardboard laminated polyethylene- or low-density polyethylene-coating having the basis weight of 40 g/m 2>. The cardboard layer consists of load and sulfate-paper. The laminate consists of the cardboard layer and the multilayer film that are wrapped on two-parts.