Method and apparatus for roll winding measurement
AssigneeInternational Paper Company
InventorKhaim Lisnyansky
Life of this patent
Estimating the term…
Abstract
A method and apparatus for continuously measuring the compressive strain and determining the compressive pressure on rolls of flexible material as they are being wound and for measuring the accumulated length of material wound on the roll. An accurate measurement is recorded of the length and caliper of each layer of the roll. From these measurements, the compressive strain and compressive pressure are determined and this information is used to control the winding process. The length measurements are also employed to correct the accumulated length measurement after the winding has been interrupted for removal of defective layers of material.
Claims9
Apparatus for measuring the length of successive layers of a web of flexible material wound on a roll by a winder, for determining the compressive strain on the web of flexible material and for determining the accumulated length of the material which has been wound onto the roll, which comprises:
- first pulse encoder means for generating signals representing a first portion of a rotation and a second portion of a rotation of the roll onto which the material is wound,
- second pulse encoder means for generating signals representing the length of material being wound onto the roll,
- processor means, responsive to said signals from said first and second pulse encoders, which measures for each revolution of said roll the length of material wound onto the roll during that revolution and the accumulated length of material wound onto the roll from the start of the roll,
- memory means for storing said length measurements for each revolution and said accumulated length measurements,
- means for deriving signals indicative of said length measurements for each revolution,
- means for combining and transforming said indications into a further indication of the compressive strain on at least one layer of the material wound onto the roll, and
- reset control means for correcting the accumulated length measurement after at least one defective layer of material has been removed from the roll.
Apparatus for controlling a winder for winding a web of flexible material on a roll which comprises:
- first pulse encoder means for generating signals representing a first portion of a rotation and a second portion of a rotation of the roll onto which the material is wound,
- second pulse encoder means for generating signals representing the length of material being wound onto the roll,
- processor means, responsive to said signals from said first and second pulse encoders, which measures for each revolution of said roll the length of material wound onto the roll during that revolution and the accumulated length of material wound onto the roll from the start of the roll,
- memory means for storing said length measurements for each revolution and said accumulated length measurements,
- means for deriving signals indicative of said length measurements for each revolution,
- means for combining and transforming said indications into a further indication of the compressive strain on at least one layer of the material wound onto the roll, and
- means responsive to said compressive strain indication for adjusting continuously at least one operating parameter of said winder such that the compressive strain is maintained at a progression of predetermined values as said flexible material is wound onto the roll.
A method for controlling a winder for winding a web of flexible material on a roll, said method comprising:
- measuring the length of each layer of said flexible material as it is applied to the roll,
- deriving a signal indicative of said length measurements for each revolution,
- combining and transforming said indications into a further indication of the compressive strain on at least one layer of the material wound onto the roll, and
- adjusting continuously at least one operating parameter of the winder as a function of said compressive strain indication such that the compressive strain is maintained at a progression of predetermined values as said flexible material is wound onto the roll.
Dependencies are inferred from the claim text.