UN METODO PARA REDUCIR EL GROSOR DE UN MATERIAL PARA RECIPIENTES DE EMPAQUE QUE COMPRENDE UNA CAPA DE CARTON Y UN REVESTIMIENTO TERMOPLASTICO

摘要

The invention relates to a method for carrying out along optional reagions of a blank or a web of a material comprising at least one layer of paper or cardboard a local thickness reduction of the web or the blank for the purpose of obtaining visible markings or of facilitating the shaping of the material and/or improving the prerequisites for manufacturing packages from the material. The said thickness reduction is achieved by passing the material (141) over one or more die rolls (140), each being provided with raised portions (139) and by bringing the material by means of the said die rolls into contact with a rapidly rotating grinding wheel (142) with the help of which selected surfaces (143) of the material are ground away. The invention also relates to a material to be used for packages which can be easily folded in spite of some layers being overlapped.