Method and apparatus for the inspection of a paper web wound on a bobbin

Patent metadata

Field	Value
Publication number	US-11397175-B2
Application number	US-202016773069-A
Country	US
Kind code	B2
Filing date	Jan 27, 2020
Priority date	Jan 27, 2020
Publication date	Jul 26, 2022
Grant date	Jul 26, 2022

Abstract

An apparatus adapted to examine a paper web includes a rotatable first bobbin, a rotatable second bobbin, and a first testing device. The first bobbin has a paper we wound thereabout that has transverse bands spaced apart along a length thereof. The second bobbin is arranged to receive the paper web from the first bobbin with a paper web path defined between the first and second bobbins. The first testing device is disposed along the paper web path and is arranged to nondestructively measure a diffusivity of one of the transverse bands of the paper web.

First claim

What is claimed:

1. A method of testing a paper web, the method comprising:
advancing a paper web from a first bobbin to a second bobbin such that a band of the paper web is in registration with a first testing device positioned along a paper web path between the first and second bobbins;
nondestructively measuring a diffusivity of the first band with the first testing device; and
advancing the paper web to test a subsequent band when the diffusivity of the first band is within specification;
identifying the first band is out of specification;
advancing the paper web such that a second band adjacent the first band is in registration with the first testing device;
nondestructively measuring a diffusivity of the second band with the first testing device;
retracting the paper web from the second bobbin to the first bobbin such that a third band adjacent the first band is in registration with the first testing device, the first band between the second and third bands; and
nondestructively measuring a diffusivity of the third band with the first testing device.

2. The method according to claim 1 , further comprising identifying the first band as a singular error when the second and third bands are within specification.

3. The method according to claim 1 , further comprising identifying a defective section of the paper web when either the second band or the third band is outside of specification.

4. The method according to claim 3 , wherein identifying the defective section of the paper web comprises:
advancing the paper web such that a subsequent band beyond the second band is in registration with the first testing device;
nondestructively measuring a diffusivity of the subsequent band with the first testing device;
repeating advancing and nondestructively measuring a diffusivity of the subsequent bands until a subsequent band is within specification; and
marking a first end of the defective section as the subsequent band within specification.

5. The method according to claim 4 , wherein repeating advancing and nondestructively measuring a diffusivity of subsequent bands includes increasing a length of advancement between subsequent bands when a subsequent band is out of specification.

6. The method according to claim 4 , wherein repeating advancing and nondestructively measuring includes advancing the paper web in a range of 2 centimeters to 10 meters between subsequent bands.

7. The method according to claim 4 , wherein identifying the defective section includes marking a second end of the defective section as a band previous to the first band which measured within specification.

8. The method according to claim 4 , further comprising marking a second end of the defective section, wherein marking the second end of the defective section comprises:
retracting the paper web such that a previous band beyond the third band is in registration with the first testing device;
nondestructively measuring a diffusivity of the previous band with the first testing device;
repeating retracting and nondestructively measuring a diffusivity of the previous bands until a previous band is within specification; and
marking the second end of the defective section as the previous band within specification.

9. The method according to claim 1 , wherein advancing the paper web includes rotating the second bobbin with a first motor to wind the paper web about the second bobbin and to unwind the paper web from the first bobbin and applying tension to the paper web with a second motor engaged with the first bobbin, the second motor configured to rotate the first bobbin to wind the paper web about the first bobbin.

Assignees

• Reynolds Tobacco Co R

Inventors

• Ademe Balager

Classifications

• G01N13/00

  Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects (scanning-probe techniques or apparatus G01Q) · CPC title

• G01N2013/003

  Diffusion; diffusivity between liquids · CPC title

• B65H2801/54

  Cigarette making · CPC title

• G01N33/34 Primary

  Paper · CPC title

• G01N15/0806

  Details, e.g. sample holders, mounting samples for testing · CPC title