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WO2015132735A1 - Method and device for identifying and counting fibers on a transparent tape - Google Patents

Method and device for identifying and counting fibers on a transparent tape Download PDF

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Publication number
WO2015132735A1
WO2015132735A1 PCT/IB2015/051577 IB2015051577W WO2015132735A1 WO 2015132735 A1 WO2015132735 A1 WO 2015132735A1 IB 2015051577 W IB2015051577 W IB 2015051577W WO 2015132735 A1 WO2015132735 A1 WO 2015132735A1
Authority
WO
WIPO (PCT)
Prior art keywords
tape
fibers
flatbed
scanner
shield
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IB2015/051577
Other languages
French (fr)
Inventor
Niklas Elvin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Stora Enso Oyj
Original Assignee
Stora Enso Oyj
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Stora Enso Oyj filed Critical Stora Enso Oyj
Publication of WO2015132735A1 publication Critical patent/WO2015132735A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/06—Investigating concentration of particle suspensions
    • G01N15/0606—Investigating concentration of particle suspensions by collecting particles on a support
    • G01N15/0612—Optical scan of the deposits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00002—Diagnosis, testing or measuring; Detecting, analysing or monitoring not otherwise provided for
    • H04N1/00007—Diagnosis, testing or measuring; Detecting, analysing or monitoring not otherwise provided for relating to particular apparatus or devices
    • H04N1/00018—Scanning arrangements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/34—Paper
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/2813—Producing thin layers of samples on a substrate, e.g. smearing, spinning-on
    • G01N2001/2833—Collecting samples on a sticky, tacky, adhesive surface

Definitions

  • the present invention relates to a method and a device for identifying and counting fibers on a transparent, adhesive tape.
  • a well-known problem in the paperboard manufacturing process is the presence of fibers released from the back ply of the paperboard.
  • the fibers tend to stick on the top ply of the paperboard, when the paperboard is rolled up on a jumbo roll.
  • the fibers on the top ply can results in problems in the printing process.
  • the problems could contain both damage of printing equipment and poor printing result due to missing dots.
  • a method to perform this measurement is to cut out a paperboard party comprising three sheets of paperboard from a jumbo roll with rolled up paperboard. The two outer sheets are then and the middle sheet is chosen to be analyzed.
  • a transparent, adhesive tape is thereafter applied to the back ply of the paperboard sheet. The tape is then removed and possible loose fibers have now stucked onto the tape.
  • the tape is then fastened on a plastic, see- through film.
  • the see-through film with the tape is then placed in a light microscope to be analyzed.
  • the number of fibers on the tape which is in the range between 0.5-3 mm, is then counted manually by an operator. An object less than 0.5 mm is probably not a problem in the process and an object longer than 3 mm is probably not a fiber .
  • the present invention provides a method and a device which are more efficient and better of counting the number of fibers which have been stucked onto a
  • the device in accordance with the invention is a
  • a scanner for creating a digital image of the tape, where the scanner comprises a flatbed for placing the tape onto to be analyzed,
  • the shield is arranged at a predetermined distance away from the flatbed, wherein the distance is greater than the focal length of the scanner, and
  • Figure 1 shows a preferred embodiment of a device for counting number of fibers on an adhesive tape, which has been placed onto the back ply of a paperboard.
  • a preferred method in accordance with the invention comprising the steps of cutting out a paperboard party with at least three sheets of paperboard from a jumbo roll with rolled up paperboard. A sheet in between the outer sheets is picked out to be analyzed. The outer sheets that surround the chosen sheet are primary used to protect the sheet to be analyzed from outer environment, such as dust or similar. Therefore are these surrounding sheets removed and are not used in the following steps of the analysis.
  • the paperboard sheet to be analyzed having a first surface, i.e. the back ply and a second surface, i.e. top ply.
  • paperboard is rolled up on the jumbo roll.
  • a transparent, adhesive tape is thereafter placed and stucked onto the back ply of the middle paperboard sheet.
  • the tape has a suitable size for the purpose, preferably about 250x19 mm.
  • the tape is thereafter removed from the back ply of the paperboard sheet.
  • the fibers on the back ply of the paperboard have now been stucked on to the adhesive tape.
  • the tape, with fibers, is then fastened on a plastic, see-through film.
  • the plastic, see-through film with the tape is then placed in the inventive device 1 to be analyzed.
  • the device 1 comprises a scanner 2 for creating a digital image of the tape with fibers.
  • the scanner 2 is suitably a modified, conventional colour, flatbed scanner, for example a CANON CANOSCAN 9000f.
  • the scanner 2 comprising a flatbed 3 onto which the tape is placed to be analyzed.
  • the scanner 2 is modified in such a way that the ordinary pivotal document cover of the scanner 2 is not used in the analysis.
  • the device 1 comprises a shield 4 for covering the flatbed in use.
  • the shield 4 is arranged over the flatbed 3 at a predetermined distance X from the flatbed 3, wherein the distance X is at least greater than the focal length for the scanner 2.
  • the focal length is about 100 mm.
  • the interior surface of the shield 4 surface, which facing against the flatbed 3, must have a high absorption coefficient, in order to not disturb the focus of the tape when the digital image of the tape is created by the scanner 2.
  • a preferred absorption coefficient is in the range 0.8-1, preferably 0.9-1.
  • the shield 4 may be a box, a piece of fabric or similar.
  • a preferred shield 4 is made of black velvet.
  • the device 1 further comprises a computer 5 for analyzing the image of the tape with fibers.
  • the computer 5 is therefore connected with the scanner 2, such that the image is transferred to the computer 5.
  • the transfer of the image may be done through a wire such as USB, HDMI, and FIREWIRE or similar. Also wireless transfer is possible such as BLUETOOTH.
  • the computer 5 having software for analyzes of the image.
  • a preferred software for this purpose is MATLAB.
  • the software is programmed with a script suitable to identify and count fibers on the tape which are in the range
  • the amount of fibers on the tape is a measurement of the amount of fibers that have been released from the back ply of the paperboard and stuck on the top ply when the paperboard is rolled up on the jumbo roll. If the counted number of identified fibers exceeds a predetermined value, an adjustment in the manufacturing process must be taken in order to decrease the content of fibers that releases from the back ply of the paperboard.
  • the skilled person realises that other possibilities are possible than fasten the tape on a plastic, see-through film.
  • the tape can be fastened on a glass-plate or even directly onto the flatbed of the scanner.

Landscapes

  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Health & Medical Sciences (AREA)
  • Pathology (AREA)
  • Analytical Chemistry (AREA)
  • Immunology (AREA)
  • General Physics & Mathematics (AREA)
  • Biochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Medicinal Chemistry (AREA)
  • Signal Processing (AREA)
  • Food Science & Technology (AREA)
  • Multimedia (AREA)
  • Biomedical Technology (AREA)
  • Dispersion Chemistry (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

Method for identifying and counting fibers on a transparent, adhesive tape. The method is characterized in that it comprises the steps of placing the tape on a flatbed of a scanner; placing a shield over the flatbed and the tape, where the shield is arranged at predetermined distance away from the flatbed and where the distance is greater than the focal length of the scanner; creating a digital image of the tape with the scanner; transferring the image to a computer; and analyzing the image of the tape, wherein fibers on the tape are identified and counted by a software script in the computer.

Description

METHOD AND DEVICE FOR IDENTIFYING AND COUNTING FIBERS ON A TRANSPARENT TAPE
Technical field
The present invention relates to a method and a device for identifying and counting fibers on a transparent, adhesive tape.
Prior art - Problem
A well-known problem in the paperboard manufacturing process is the presence of fibers released from the back ply of the paperboard. The fibers tend to stick on the top ply of the paperboard, when the paperboard is rolled up on a jumbo roll. The fibers on the top ply can results in problems in the printing process. The problems could contain both damage of printing equipment and poor printing result due to missing dots.
It is therefore important to continuously, in the
process, measure the emergence of fibers that releases from the back ply and thereby preventing the above mentioned problem from occurring.
A method to perform this measurement is to cut out a paperboard party comprising three sheets of paperboard from a jumbo roll with rolled up paperboard. The two outer sheets are then and the middle sheet is chosen to be analyzed. A transparent, adhesive tape is thereafter applied to the back ply of the paperboard sheet. The tape is then removed and possible loose fibers have now stucked onto the tape. The tape is then fastened on a plastic, see- through film. The see-through film with the tape is then placed in a light microscope to be analyzed. The number of fibers on the tape, which is in the range between 0.5-3 mm, is then counted manually by an operator. An object less than 0.5 mm is probably not a problem in the process and an object longer than 3 mm is probably not a fiber .
If the counted number of fibers on the tape exceeds a predetermined value, an adjustment in the manufacturing process must be taken in order to decrease the content of fibers that releases from the back ply.
The method to manually count fibers with a light
microscope has some drawbacks. It is difficult to
identify and count the fibers, which results in a lack of measurement reliability. The method is also time- consuming, due to the difficulty for the operator to identify and measure fibers in the range 0.5-3 mm. The present invention provides a method and a device which are more efficient and better of counting the number of fibers which have been stucked onto a
transparent, adhesive tape. Short summary of the invention
The method in accordance with the invention is
characterized in that the method comprises the steps of:
- placing the tape on a flatbed of a scanner,
- placing a shield over the flatbed and the tape, where the shield is arranged at predetermined distance away from the flatbed and where the distance is greater than the focal length of the scanner,
- creating a digital image of the tape with the scanner,
- transferring the image to a computer, and
- analyzing the image of the tape, wherein fibers on the tape are identified and counted by a software script in the computer.
The device in accordance with the invention is
characterized in that the device comprises:
- a scanner for creating a digital image of the tape, where the scanner comprises a flatbed for placing the tape onto to be analyzed,
- a shield for covering the flatbed where the
shield is arranged at a predetermined distance away from the flatbed, wherein the distance is greater than the focal length of the scanner, and
- a computer with software suitable for analyzing the image by identifying and counting the fibers of the tape.
Detailed description of a preferred embodiment In the following, the invention will be described further with reference to the drawings, wherein: Figure 1 shows a preferred embodiment of a device for counting number of fibers on an adhesive tape, which has been placed onto the back ply of a paperboard. A preferred method in accordance with the invention comprising the steps of cutting out a paperboard party with at least three sheets of paperboard from a jumbo roll with rolled up paperboard. A sheet in between the outer sheets is picked out to be analyzed. The outer sheets that surround the chosen sheet are primary used to protect the sheet to be analyzed from outer environment, such as dust or similar. Therefore are these surrounding sheets removed and are not used in the following steps of the analysis. The paperboard sheet to be analyzed having a first surface, i.e. the back ply and a second surface, i.e. top ply.
Fibers that have released from the back ply of a
paperboard tend to stick on the top ply, when the
paperboard is rolled up on the jumbo roll.
A transparent, adhesive tape is thereafter placed and stucked onto the back ply of the middle paperboard sheet. The tape has a suitable size for the purpose, preferably about 250x19 mm.
The tape is thereafter removed from the back ply of the paperboard sheet. The fibers on the back ply of the paperboard have now been stucked on to the adhesive tape.
The tape, with fibers, is then fastened on a plastic, see-through film.
The plastic, see-through film with the tape is then placed in the inventive device 1 to be analyzed. The device 1 comprises a scanner 2 for creating a digital image of the tape with fibers. The scanner 2 is suitably a modified, conventional colour, flatbed scanner, for example a CANON CANOSCAN 9000f. The scanner 2 comprising a flatbed 3 onto which the tape is placed to be analyzed. The scanner 2 is modified in such a way that the ordinary pivotal document cover of the scanner 2 is not used in the analysis. Instead, the device 1 comprises a shield 4 for covering the flatbed in use. The shield 4 is arranged over the flatbed 3 at a predetermined distance X from the flatbed 3, wherein the distance X is at least greater than the focal length for the scanner 2. For the above mentioned scanner 2 the focal length is about 100 mm. The interior surface of the shield 4 surface, which facing against the flatbed 3, must have a high absorption coefficient, in order to not disturb the focus of the tape when the digital image of the tape is created by the scanner 2. A preferred absorption coefficient is in the range 0.8-1, preferably 0.9-1. The shield 4 may be a box, a piece of fabric or similar. A preferred shield 4 is made of black velvet.
The device 1 further comprises a computer 5 for analyzing the image of the tape with fibers. The computer 5 is therefore connected with the scanner 2, such that the image is transferred to the computer 5. The transfer of the image may be done through a wire such as USB, HDMI, and FIREWIRE or similar. Also wireless transfer is possible such as BLUETOOTH.
The computer 5 having software for analyzes of the image. A preferred software for this purpose is MATLAB. The software is programmed with a script suitable to identify and count fibers on the tape which are in the range
0.5-3 mm. The amount of fibers on the tape is a measurement of the amount of fibers that have been released from the back ply of the paperboard and stuck on the top ply when the paperboard is rolled up on the jumbo roll. If the counted number of identified fibers exceeds a predetermined value, an adjustment in the manufacturing process must be taken in order to decrease the content of fibers that releases from the back ply of the paperboard. The above mentioned method to use the inventive device to identify has, of course, some major benefits in
comparison to the known method of manually counting the fibers with a light microscope. First is the identifying of the fibers done in a uniform and convenient way.
Secondly, the counting of fibers is much easier and also much faster.
In the foregoing, the invention has been described on the basis of a specific preferred embodiment. It is
appreciated, however, that other embodiments and variants are possible within the scope of the following claims. For example it is obvious that the method to pick out the sheet to be analyzed can be done in various ways. It is of course possible to only take out one sheet and leave the outer, surrounding sheets. It is also possible to protect the paperboard sheet with other things such as an envelope or similar.
Moreover, the skilled person realises that different types of scanners can be used to create the digital image of the tape.
Furthermore, the skilled person realises that other possibilities are possible than fasten the tape on a plastic, see-through film. For example the tape can be fastened on a glass-plate or even directly onto the flatbed of the scanner.

Claims

C L A I M S
. Method for identifying and counting fibers on a transparent, adhesive tape, characterized in that the method comprises the steps of:
- placing the tape on a flatbed of a scanner,
- placing a shield over the flatbed and the tape, where the shield is arranged at predetermined distance away from the flatbed and where the distance is greater than the focal length of the scanner,
- creating a digital image of the tape with the scanner,
- transferring the image to a computer, and
- analyzing the image of the tape, wherein fibers on the tape are identified and counted by a software script in the computer.
Method according to claim 1, characterized in that the method further comprises the steps of:
- placing the tape on a back ply of a paperboard sheet, and
- removing the tape from the back ply. 3. Method according to any of claims 1-2, characterized in that the method further comprises the step of fastening the tape on a see-through film.
Device (1) for identifying and counting fibers on a transparent, adhesive tape, characterized in that the device (1) comprising:
- a scanner (2) for creating a digital image of the tape, where the scanner (2) comprises a flatbed (3) for placing the tape onto to be analyzed,
- a shield (4) for covering the flatbed (3) where the shield (4) is arranged at a predetermined distance (X) away from the flatbed (3), wherein the distance (X) is greater than the focal length of the scanner (2), and
- a computer (5) with software suitable for
analyzing the image by identifying and counting the fibers of the tape.
Device according to claim 4, characterized in that the shield surface (4), which faces against the flatbed (3), has a high absorption coefficient.
Device according to claim 4, characterized in that the shield surface (4), which faces against the flatbed (3), has an absorption coefficient in the range 0.8-1.
PCT/IB2015/051577 2014-03-05 2015-03-04 Method and device for identifying and counting fibers on a transparent tape Ceased WO2015132735A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1450247-0 2014-03-05
SE1450247A SE1450247A1 (en) 2014-03-05 2014-03-05 Method and apparatus for identifying and counting fibers on a transparent tape

Publications (1)

Publication Number Publication Date
WO2015132735A1 true WO2015132735A1 (en) 2015-09-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2015/051577 Ceased WO2015132735A1 (en) 2014-03-05 2015-03-04 Method and device for identifying and counting fibers on a transparent tape

Country Status (2)

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SE (1) SE1450247A1 (en)
WO (1) WO2015132735A1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005111587A1 (en) * 2004-05-18 2005-11-24 Kabushiki Kaisya Advance Bio-specimen detection device
US20130220003A1 (en) * 2012-02-24 2013-08-29 Mark Laurint Method and apparatus for measuring deposition of particulate contaminants in pulp and paper slurries

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005111587A1 (en) * 2004-05-18 2005-11-24 Kabushiki Kaisya Advance Bio-specimen detection device
US20130220003A1 (en) * 2012-02-24 2013-08-29 Mark Laurint Method and apparatus for measuring deposition of particulate contaminants in pulp and paper slurries

Also Published As

Publication number Publication date
SE1450247A1 (en) 2015-09-06

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