Unit for treating packaging material in web in a machine for packaging food products and method for the gradual advance of a packaging material in web in said unit.

摘要

A unit (1) for treating a material (2) on continuous tape for packaging in a machine for packaging food products, having the material (2) for web packaging features which periodically recur with a repeat length (R ) given, including the media unit power control (14, 10, 18) for step-feeding said material (2) of web packaging along a path (P) feed and at least a first number (n) of processing devices (3a, 3b, 3c, 3d, 3e; 5a, 5b, 5c, 5d, 5e) spaced apart along said path and adapted to perform the same operation on said material (2) for web packaging, in parallel, during each stop of said material (2) for web packaging, characterized in that said processing devices (3a, 3b, 3c, 3d, 3e; 5a, 5b, 5c, 5d, 5e ) they are separated by a distance (D) which is equal to a second number (k) of beadin des greater than 1 repeat, said means (14, 10, 18) control means supply (14, 10, 18) for step-feeding said material (2) for web packaging according to power cycles repeated, each feed cycle being defined by a plurality of feed steps in which said material (2) for web packaging is advanced by a feed length equal to a number (L1, ..., Lk) of lengths repeat that is less than said first number (n) multiplied by said second number (k), the sum of said feed lengths (L1, ... Lk) of said feed steps that constitute a feed cycle being equal to said first number (n) multiplied by said second number (k), the number of feed steps defining each feed cycle being equal to said second number (k), the number of repeatlengths (L1, ... , Lk) defining LENGTH ud supply each step of not divisible by said second number power (k).