Method and plant for producing logs of thin products

A plant for producing logs of thin products, the plant comprising:

• a winding station for winding a thin product into a plurality of logs on corresponding support cores, coaxial with and adjacent to one another;
• a cutting device, with a plurality of blades, arranged opposite said support cores;
• a plant management electronic center;
• graphic or electronic or magnetic supports applied to said logs, wherein a master or primary log is assigned a primary ID code to said master roll or primary log, said master roll or primary log being marked with said primary code, wherein information on said parameters to said primary ID code of said master roll or primary log is associated with a database such that, in said database system, to a given primary ID code information are associated on parameters of said corresponding master roll or primary log;
• a reading and/or writing device for reading and/or writing on said graphic or electronic or magnetic supports, configured to write or to program said graphic or electronic or magnetic supports, associated with said winding station and operatively connected to said plant management electronic center;
• at least one detection device for detecting said parameters of said thin product being wound on said logs, said parameters comprising one or more of:
• defects in a surface and/or a thickness of said thin product, comprising a position of said defects on said log, said information on said position comprising coordinates of said defects on said log in terms of product meters unwound from a center of said log and distance from an edge of said log;
• mechanical parameters;
• winding parameters comprising log density profile and/or tension and/or sliding and/or NIP;
• and position of joins for removing defects;
• a rewinder configured to:
• cut a common support core into a plurality of secondary support cores on which said product is rewound, of transverse width equal to a transverse width of said secondary logs;
• unwind said thin product;
• cut said thin product in a product feeding direction, wherein a cut position being such as to cut said product into two or more strips of transverse width equal to said transverse width of corresponding secondary support cores arranged adjacent and aligned together;
• rewind said strips on said respective secondary support cores to produce secondary logs of said thin product, the plant management electronic center being configured to:
• read said primary ID code of said master roll or primary log;
• acquire said information on said parameters of said thin product in said master log or primary log, to which said primary ID code, read by said database system, is associated;
• assign secondary ID codes to respective secondary logs;
• mark said secondary logs by respective secondary ID codes;
• change said information on a first series of parameters of said master log or primary log into information on a second series of parameters of each secondary log;
• associate, in said database system, said secondary ID codes to said respective information on said parameters on corresponding secondary logs, such that a second series of parameters is associated with each secondary log.

A method for producing logs of continuous thin products in an optimized way, providing for tracking product parameters detected in log winding steps, the method comprising the steps of:

• cutting a thin product into a plurality of strips;
• winding said strips of a plurality of adjacent logs;
• detecting, before or after cutting said thin product into said plurality of strips, parameters associated with said thin product;
• storing information on said parameters in a database system, outside said logs, for at least one log of said plurality of adjacent logs;
• assigning an ID code to said at least one log;
• marking said at least one log with said ID code;
• associating, in said database system, said information on said parameters to said ID code of said at least one log, so that information on said parameters of said corresponding log are associated, in said database, to a given ID code;
• sharing, in subsequent processing steps of said at least one log, said information on said parameters stored in said database system, wherein said information on said parameters of at least one log, stored in said database system, is used in order to optimize at least one subsequent processing of said product wound into said at least one log, said use providing for recognizing said ID code of said at least one log being processed and said processing of said product of said log based on said information on said parameters of said log;
• winding a master roll or primary log, and subsequently winding said master roll or primary log into said plurality of secondary logs and cutting said plurality of secondary logs into strips;
• identifying a first series of said parameters associated with said thin product wound to produce said master roll or primary log;
• storing, in said database system outside said master roll or primary log, information on said parameters;
• assigning a primary ID code to said master roll or primary log;
• marking said master roll or primary log with said primary code;
• associating, in said database system, information on said parameters to said primary ID code of said master roll or primary log so that, in said database system, to a given primary ID code information are associated on said parameters of said corresponding master roll or primary log;
• providing a rewinder;
• cutting a common support core via said rewinder into a plurality of secondary support cores on which said product is rewound, of transverse width equal to a transverse width of said secondary logs;
• unwinding said thin product via said rewinder;
• cutting said thin product in a product feeding direction via said rewinder, wherein a cut position being such as to cut said product into two or more strips of transverse width equal to said transverse width of corresponding secondary support cores arranged adjacent and aligned together;
• rewinding said strips, via said rewinder, on said respective secondary support cores to produce secondary logs of said thin product;
• reading said primary ID code of said master roll or primary log;
• acquiring said information on said parameters of said thin product in said master log or primary log, to which said primary ID code, read by said database system, is associated;
• assigning secondary ID codes to respective secondary logs;
• marking said secondary logs by respective secondary ID codes;
• changing said information on said first series of parameters of said master log or primary log into information on said second series of parameters of each secondary log;
• associating, in said database system, said secondary ID codes to said respective information on said parameters on corresponding secondary logs, such that a second series of parameters is associated with each secondary log.