PROCESS FOR PRODUCTION OF TUBES OUT OF COMPOSITE CARDBOARD, DEVICE FOR CARRYING OUT THE PROCESS AND COMPOSITE MATERIAL USED THEREIN

摘要

PCT No. PCT/EP97/00349 Sec. 371 Date Jul. 27, 1998 Sec. 102(e) Date Jul. 27, 1998 PCT Filed Jan. 27, 1998 PCT Pub. No. WO97/27041 PCT Pub. Date Jul. 31, 1997A gas-tight tube out of composite cardboard for cans is formed by welding the polymer coatings of neighboring layers, a linearly-focused halogen light source being employed. A marginal strip of the composite material is heated from the side of the material opposite to that having the polymer coating to be melted and welded. In addition, a layer which absorbs and transforms the halogen light into heat can be provided in the area of the marginal strip on the side thereof on which the halogen light is focused. An apparatus for carrying out the process and suitable composite materials are described.