Method and devices and system for winding and unwinding a reel

A control method for performing an unwinding process on an unwinding device, comprising the following steps:

• at least partially unwinding a web material from a reel during the unwinding process,
• obtaining a correlation between an irregularity of the web material and at least one running parameter of the reel from a winding process, and
• performing a response action in response to the irregularity, when a position of the web material is reached based on the correlation between the irregularity and the running parameter upon unwinding of the web material,
• wherein the obtaining the correlation between the irregularity and the running parameter comprises the following step:
• reading out a reel-specific information medium which is arranged on the reel and comprises the correlation between the irregularity and the running parameter by a detector of a reference interface,
• wherein the web material comprises a plastic film,
• wherein the response action comprises at least one of the following actions:
• interrupting the unwinding process,
• changing a speed of unwinding the web material,
• changing of processing parameters,
• suspending individual processing steps, and
• adding individual special processing steps,
• wherein the unwinding device comprises a form, fill and seal (FFS) machine and is adapted to produce sacks from the web material, and
• wherein a number of sacks produced from the web material is determined based on the running parameter and the irregularity of the web material.

An unwinding device for performing an unwinding process of a web material of a reel, comprising:

• a reel holder on which the reel can be stored during the unwinding process;
• a reference interface for obtaining a correlation between an irregularity of the web material and at least one running parameter of the reel from a winding process;
• and
• a position detector by which an unwinding of the web material can be monitored during the unwinding process, so that a response action in response to the irregularity is performed, when a position of the web material is reached based on the correlation between the irregularity and the running parameter in the unwinding process,
• wherein:
• the reference interface comprises a detector for reading out a reel-specific information medium which is arranged on the reel and comprises the correlation between the irregularity and the running parameter,
• the web material comprises a plastic film,
• the response action comprises at least one of the following actions:
• interrupting the unwinding process,
• changing a speed of unwinding the web material,
• changing of processing parameters,
• suspending individual processing steps, and
• adding individual special processing steps,
• the unwinding device comprises a form, fill and seal (FFS) machine and is adapted to produce sacks from the web material, and
• the position detector is configured to determine a number of sacks produced from the web material based on the running parameter and the irregularity of the web material.