Monitoring upstream machine wires and felts

Patent metadata

Field	Value
Publication number	US-9816232-B2
Application number	US-201514735655-A
Country	US
Kind code	B2
Filing date	Jun 10, 2015
Priority date	Jun 10, 2015
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

Abstract

Collecting data includes generating a sensor signal from each of a plurality of sensors located on a sensing roll, wherein each signal is generated when each sensor enters a region of a nip between the sensing roll and mating roll during each rotation of the sensing roll; wherein a web of material travels through the nip and a continuous band contacts a region of the web of material upstream from or at the nip. A periodically occurring starting reference is generated associated with each rotation of the continuous band and the signal generated by each sensor is received so that the one of the plurality of sensors which generated this signal is determined and one of a plurality of tracking segments associated with the continuous band is identified. The signal is stored to associate the respective sensor signal with the identified one tracking segment.

First claim

The invention claimed is:

1. A system associated with a sensing roll and a mating roll for collecting roll data comprising:
the sensing roll and mating roll located relative to one another to create a nip therebetween, wherein a web of material travels through the nip from an upstream direction to a downstream direction and a continuous band, arranged to travel around in a loop pattern, contacts at least a region of the web of material upstream from the nip;
a plurality of sensors located at axially spaced-apart locations of the sensing roll, wherein each sensor enters a region of the nip during each rotation of the sensing roll to generate a respective sensor signal;
structure for generating a periodically occurring time reference associated with each rotation of the continuous band around the loop pattern; and
a processor to receive the periodically occurring time reference and the respective sensor signal generated by each sensor and, after receiving the respective sensor signal, the processor operates to:
determine a particular one of the plurality of sensors which generated the respective sensor signal,
based upon an amount of time that elapsed between when the respective sensor signal was generated and a most recent time reference, identify one of a plurality of time-based tracking segments associated with the continuous band, wherein each of the plurality of tracking segments is, respectively, associated with a different amount of elapsed time, and
store the respective sensor signal to associate the respective sensor signal with the identified one time-based tracking segment.

2. The system of claim 1 , wherein the continuous band comprises a press felt.

3. The system of claim 1 , wherein the continuous band comprises a wire mesh.

4. The system of claim 1 , wherein the continuous band does not travel through the nip.

5. The system of claim 1 , wherein the received sensor signal comprises a pressure value.

6. The system of claim 1 , wherein the processor receives:
the respective sensor signal for each of the plurality of sensors during each rotation of the sensing roll, and
a plurality of the respective sensor signals occurring during a plurality of rotations of the sensing roll.

7. The system of claim 6 , wherein, for each one of the plurality of the respective sensor signals, the processor identifies an associated continuous band axial segment and its identified one time-based tracking segment.

8. The system of claim 7 , wherein:
the continuous band comprises n axial segments, having respective index values: 1, 2, . . . , n;
a continuous band rotational period comprises m time-based tracking segments, each having a respective, unique index value x in the range of: 1, 2, . . . , m, and
wherein there are (n times m) unique permutations that are identifiable by a two-element set comprising a respective axial segment index value and a respective time-based tracking segment index value.

9. The system of claim 8 , wherein, for the plurality of respective sensor signals and for one or more of the possible (n times m) permutations, the processor determines an average of all the plurality of respective sensor signals associated with an axial segment and time-based tracking segment matching each of the one or more permutations.

10. The system of claim 8 , wherein the continuous band comprises:
m circumferential tracking segments relative to a reference location on the continuous band, each having a respective, unique index value q in the range of: 1, 2, . . . , m, and, wherein
each time-based tracking segment is associated with a corresponding circumferential tracking segment.

11. The system of claim 10 , wherein the index value x of a particular time-based tracking segment is calculated independently from calculating the index value q of the corresponding circumferential tracking segment.

12. The system of claim 10 , wherein:
each circumferential tracking segment of the continuous band contacts the web of material at an upstream location from the region of the nip; and
the index value q of each circumferential tracking segment is calculated based on a) a distance between the region of the nip and the upstream location and b) the index value x of the corresponding time-based tracking segment.

13. The system of claim 10 , wherein the structure for generating a periodically occurring time reference comprises:
a signal generator to generate a trigger signal on each rotation of the continuous band as the reference location on the continuous band travels past a predetermined position.

14. The system of claim 13 , wherein:
each circumferential tracking segment of the continuous band contacts the web of material at an upstream location from the region of the nip;
one particular circumferential tracking segment contacts the web of material at the upstream location substantially concurrently with the signal generator generating the trigger signal, and
the index value q of each circumferential tracking segment is calculated based on a) a distance between the region of the nip and the upstream location, b) the index value of the one particular circumferential tracking segment, and c) the index value x of the corresponding time-based tracking segment.

15. A system associated with a sensing roll and a mating roll for collecting roll data comprising:
the sensing roll and mating roll located relative to one another to create a nip therebetween, wherein a web of material travels through the nip from an upstream direction to a downstream direction and a continuous band, arranged to travel around in a loop pattern, contacts at least a region of the web of material upstream from the nip;
a plurality of sensors located at axially spaced-apart locations of the sensing roll, wherein each sensor enters a region of the nip during each rotation of the sensing roll to generate a respective sensor signal;
a signal generator to generate a periodically occurring time reference associated with each rotation of the continuous band around the loop pattern; and
a processor to receive the periodically occurring time reference and the respective sensor signal generated by each sensor and, after receiving the respective sensor signal, the processor operates to:
determine a particular one of the plurality of sensors which generated the respective sensor signal,
based upon the respective sensor signal and a time reference, identify one of a plurality of time-based tracking segments associated with the continuous band, and
store the respective sensor signal to associate the respective sensor signal with the identified one time-based tracking segment.

Assignees

• Int Paper Co

Inventors

• Figiel Kerry D

Classifications

• D21G9/0036

  controlling the press or drying section · CPC title

• D21F3/08 Primary

  Pressure rolls · CPC title

• G01L5/0085

  Force sensors adapted for insertion between cooperating machine elements, e.g. for measuring the nip force between rollers · CPC title

• D21F7/06

  Indicating or regulating the thickness of the layer; Signal devices · CPC title

• D21F3/0209 Primary

  with extended press nip · CPC title