CA1176839A - Length measuring instrument for paper fibres - Google Patents

Length measuring instrument for paper fibres

Info

Publication number
CA1176839A
CA1176839A CA000410147A CA410147A CA1176839A CA 1176839 A CA1176839 A CA 1176839A CA 000410147 A CA000410147 A CA 000410147A CA 410147 A CA410147 A CA 410147A CA 1176839 A CA1176839 A CA 1176839A
Authority
CA
Canada
Prior art keywords
capillary tube
fibre
measuring instrument
length measuring
fibres
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.)
Expired
Application number
CA000410147A
Other languages
French (fr)
Inventor
Tapio Makkonen
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.)
Kajaani Oy
Original Assignee
Kajaani Oy
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 Kajaani Oy filed Critical Kajaani Oy
Application granted granted Critical
Publication of CA1176839A publication Critical patent/CA1176839A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • G01N33/343—Paper pulp
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
    • 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
    • G01N15/02—Investigating particle size or size distribution
    • G01N15/0205—Investigating particle size or size distribution by optical means

Landscapes

  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Dispersion Chemistry (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

ABSTRACT OF DISCLOSURE
A paper fibre length measuring instrument, comprising a capillary tube, through which the fibres to be measured, in a liquid, are passed, and having on one side of the capillary tube a light source and on the opposite side of the capillary tube a photocell from the results of which the lengths of the fibres are determinable. The photocell comprises a diode matrix of which the diodes calculate the fibre length from the image of the passing fibre.

Description

iL17~3~

The present invention relates to a paper fibre length measuring instrument comprising a capillary tube through which the fibres to be measured, in a liquid, are passed and having on one side of the capillary tube a light source and on the opposite side of the capillary tube a photocell, from the results of which the fibre lengths are determinable.

By the invention a more precise procedure for measuring fibre length is provided, compared with those in use nowadays. The length measuring instrument of the invention is such that the photocell comprises a diode matrix, the diodes of this matrix calculating the length of the fibre from the image of the passing fibre. With the invention a highly reliable and accurate length is obtained - for the fibre because the passing fibre, at a certain point, obscures part of the diodes, on the basis of their number the length of the fibre being immediately readable on a display unit which is part of the length measuring instrument.

In an advantageous embodiment of the invention between the light source and the diode matrix are positioned crossed polarizers, by which it can be ensured that the instrument will only register fibres and not other foreign objects, such as air bubbles.

The present invention will be further illustrated by way of the accompanying drawing , presenting the length measuring instrument according to the embodiment of the present invention in simplified manner.

The length measuriny instrument comprises a capillary tube 1, through which the fibres 2 to be measured, in a liquid, are passed. On one side of the capillary tube 1 there is a light source 3 and on the opposite side of the capillary tube, a photocell 4. The photocell 4 comprises 3~

... .
a diode matrix, of which the diodes 5 calculate the fibre length from the image of the passing fibre 2. Between the light source 3 and the diode matrix 4, polarizers 6, 7 are provided.

The fibres 2 are passed downwardly within the capillary tube 1, in the direction indicated by the arrow 8.
With the aid of the light source 3 and lenses 6, 7, 9, 10 a moving image shaped like the fibre is obtained on the diode matrix 4. When the lower end of the image reaches the lowermost diode 11 of the diode matrix, the image upwardly covers part of the diodes 5, whence the fibre length is immediately readable.

~r-~ ~ ~ 2

Claims (2)

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A paper fibre length measuring instrument comprising a capillary tube through which the fibres to be measured, in a liquid, are passed and having on one side of the capillary tube a light source and on the opposite side of the capillary tube a photocell, the photocell comprising a diode matrix, the diodes of which calculate, from the moving image of the fibre, the fibre length.
2. An instrument according to claim 1, wherein between the light source and the diode matrix there are disposed crossed polarizers.
CA000410147A 1981-08-26 1982-08-25 Length measuring instrument for paper fibres Expired CA1176839A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI812627A FI812627L (en) 1981-08-26 1981-08-26 LAENGDMAETARE FOER PAPPERSFIBER
FI812627 1981-08-26

Publications (1)

Publication Number Publication Date
CA1176839A true CA1176839A (en) 1984-10-30

Family

ID=8514655

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000410147A Expired CA1176839A (en) 1981-08-26 1982-08-25 Length measuring instrument for paper fibres

Country Status (6)

Country Link
JP (1) JPS5852505A (en)
CA (1) CA1176839A (en)
DE (1) DE3230523A1 (en)
FI (1) FI812627L (en)
FR (1) FR2512196A1 (en)
SE (1) SE8204869L (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4837446A (en) * 1988-03-31 1989-06-06 International Paper Company Apparatus and process for testing uniformity of pulp
US5311290A (en) * 1992-09-30 1994-05-10 Pulp And Paper Research Institute Of Canada Imaging apparatus and method of fiber analysis

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59114445A (en) * 1982-12-21 1984-07-02 Yamamura Glass Kk Apparatus for detecting defect of transparent body
JPS60231136A (en) * 1984-05-01 1985-11-16 Kanzaki Paper Mfg Co Ltd Measurement of fiber orientation in paper
DE3502406C2 (en) * 1985-01-22 1987-04-23 Dr. Peter + Steinwender Technische Geräte GmbH, 8176 Waakirchen Method and device for the continuous, contactless determination of the length of an undivided, moving body
DE4118716A1 (en) * 1990-07-16 1992-01-23 Gerhart Schroff METHOD AND ARRANGEMENT FOR THE OPTICAL DETECTION AND EVALUATION OF SPREADING LIGHT SIGNALS
FR2681693A1 (en) * 1991-09-24 1993-03-26 Barrat Bertrand DEVICE FOR DIMENSIONAL ANALYSIS OF PARTICLES POSITIONED IN A PLANE.
US5293219A (en) * 1991-12-31 1994-03-08 Andritz Sprout-Bauer, Inc. Fiber length analyzer
DE19802315A1 (en) * 1998-01-22 1999-07-29 Rieter Ag Maschf Method of measuring fibre lengths
US6407819B1 (en) 1998-01-22 2002-06-18 Maschinenfabrik Rieter Ag Method and device for measuring fibre length
AU2003901910A0 (en) * 2003-04-17 2003-05-08 Commonwealth Scientific And Industrial Research Organisation Method and apparatus for testing fibres
AU2004231118B2 (en) * 2003-04-17 2009-09-17 Commonwealth Scientific And Industrial Research Organisation Method and apparatus for testing fibres
US8120769B2 (en) 2007-08-03 2012-02-21 North Carolina State University Method and system for fiber properties measurement

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4837446A (en) * 1988-03-31 1989-06-06 International Paper Company Apparatus and process for testing uniformity of pulp
US5311290A (en) * 1992-09-30 1994-05-10 Pulp And Paper Research Institute Of Canada Imaging apparatus and method of fiber analysis

Also Published As

Publication number Publication date
FR2512196A1 (en) 1983-03-04
SE8204869L (en) 1983-02-27
JPS5852505A (en) 1983-03-28
SE8204869D0 (en) 1982-08-25
FR2512196B3 (en) 1984-10-26
FI812627L (en) 1983-02-27
DE3230523A1 (en) 1983-03-17

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Legal Events

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MKEC Expiry (correction)
MKEX Expiry