CN101672764A - Method for measuring porosity of paper pulp - Google Patents
Method for measuring porosity of paper pulp Download PDFInfo
- Publication number
- CN101672764A CN101672764A CN200910193124A CN200910193124A CN101672764A CN 101672764 A CN101672764 A CN 101672764A CN 200910193124 A CN200910193124 A CN 200910193124A CN 200910193124 A CN200910193124 A CN 200910193124A CN 101672764 A CN101672764 A CN 101672764A
- Authority
- CN
- China
- Prior art keywords
- paper pulp
- porosity
- face
- pulp
- fiber
- 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.)
- Pending
Links
Landscapes
- Paper (AREA)
Abstract
A method for measuring the porosity of paper pulp, which comprises the steps: one end face of the naturally-piled paper pulp is observed with a micro apparatus, a plurality of images of the end face at different angles are acquired via a camera, and then image processing is performed by a computer to result in the porosity of the paper pulp. The method for measuring the porosity of paper pulp by optical methods has great simplicity, high accuracy and no damage to the structure of the paper pulp.
Description
Technical field
The measuring method of the porosity of paper pulp when concentration and high concentration paper pulp are as porous medium in the present invention relates to.
Background technology
Phase at beginning of the eighties in last century Northern Europe begins to use the slurrying new technology---before the dense technology of middle height of efficient, low consumption, of low pollution, paper pulp under the low dense technology is considered to a kind of Newtonian fluid always, carry with traditional centrifugal stock pump, other processing procedures also can adopt traditional mechanical.When the concentration of paper pulp reached certain value, some conclusions under the low dense condition were just no longer suitable, and middle high consistency pulp is called as " class solid ".High consistency pulp porous media properties viewpoint is Univ British Columbia Canada at first proposing, the scholar Bennington and the Pineault at UBC paper pulp papermaking center.Porous medium is meant the material of being made up of all kinds kapillary systems such as solid skeletal and the hole that is interconnected, cracks.Because middle high consistency pulp is gas, liquid, solid three-phase and the porous medium deposited, paper pulp fiber has certain network strength, interfibrous gas flow can not be ignored, and its characteristic is similar to solid to a certain extent, therefore is different from the low-consistency stock of fibrous suspension character fully.High consistency pulp in studying at first will be studied the parameter that characterizes its character.The washing of paper pulp, bleaching, concentrate and processes such as the manufacturing paper with pulp of wet web, squeezing in, porosity of paper pulp, permeability to technology, equipment determine and use all play a very important role.Therefore, the research of parameter measurements such as porosity, permeability has important significance for theories for the characteristic of high consistency pulp in determining, has great practical value equally to instructing the slurrying papermaking process.
Also there is not further conclusion to deliver in this respect at present abroad.
Domestic, people such as Chen Haifeng adopt the low-temperature vacuum drying technology to produce the porosity that thickened pulp layer sample and statistic law have been measured middle high consistency pulp.The porosity of paper pulp is defined as the hole ratio long-pending with population of samples between the bone dry fiber (water in the fiber is distilled) at this moment.But water in the middle concentration paper pulp lumen and the volume sum that is adsorbed in the water in the cell membrane approximately be whole water volume 40%; And to high consistency pulp, nearly all water is to be stored in the fiber core and to invest cell membrane.This moment, water became the part of paper pulp fiber, and the character of its paper pulp all be the character when having water to exist, thus in dense or high consistency pulp porosity to should be the porosity of heterogeneous body paper pulp just more realistic.
Summary of the invention
The purpose of this invention is to provide a kind of measurement measuring method of middle and high concentration porosity of paper pulp fast and accurately.
The method of porosity of paper pulp provided by the invention, a first end face of the paper pulp of stacking with microsurgical instrument observation nature obtains the image of a plurality of different angles of this end face by camera, then machine Flame Image Process and draw porosity of paper pulp as calculated.
Described paper pulp is through stirring.
Computer Image Processing comprises software MATLAB identification, analyzes fiber and hole in the paper pulp, and the pixel of fiber or hole and entire image is calculated the plane porosity at last by statistics.
Because middle high consistency pulp quality is soft, loosely organized, easy deformation, so the method such as the direct method of measurement porous medium volumetric porosity commonly used, mercury intrusion method, gas expansion method, centering high consistency pulps such as nitrogen adsorption method all are not suitable for, and the present invention is in conjunction with the porosity of high consistency pulp in optical method technology and the computer image processing technology measurement.Optical method is an end face at microscopically random observation paper pulp, and at this moment taking a picture at microscopically obtains a plurality of different images in this cross section, can prove that the plane porosity of paper pulp image is identical with the porosity of paper pulp.It is simple to utilize optical method to measure the porosity of paper pulp method, and the degree of accuracy height can not destroy the paper pulp structure.The plane porosity of the paper pulp image processing techniques that uses a computer is calculated, and promptly utilizes image processing software to discern, analyze, calculate the face porosity of paper pulp on computers, and this method is simple to operate, and labor capacity is little, and error is little.
Embodiment
Embodiment:
The method of porosity of paper pulp provided by the invention, paper pulp is through after stirring, naturally be deposited in an end face of the paper pulp in the glass dish with the microsurgical instrument random observation, because the fiber reflection potential different to light on the sample end face with hole, light is scattered at the hole place, can not all enter object lens, demonstrate black.Light at place, fiber plane then enters object lens with direct reflected light reflection, thereby present size and shape that white light tone demonstrates fiber, obtain the image of a plurality of different angles of this end face in the microscopically photograph by camera, the machine Flame Image Process is software MATLAB identification, analysis paper pulp mesoporosity as calculated then, the pixel of hole and entire image is by statistics carried out the plane porosity again and is calculated the porosity that is paper pulp again.
Claims (3)
1, a kind of measuring method of porosity of paper pulp is characterized in that earlier an end face of the paper pulp stacked with microsurgical instrument observation nature, obtains the image of a plurality of different angles of this end face by camera, then machine Flame Image Process and draw porosity of paper pulp as calculated.
2, the measuring method of porosity of paper pulp according to claim 1 is characterized in that described paper pulp is through stirring.
3, the measuring method of porosity of paper pulp according to claim 1 is characterized in that Computer Image Processing comprises software MATLAB identification, analyzes fiber and hole in the paper pulp, and the pixel of fiber or hole and entire image is calculated the plane porosity at last by statistics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910193124A CN101672764A (en) | 2009-10-12 | 2009-10-12 | Method for measuring porosity of paper pulp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910193124A CN101672764A (en) | 2009-10-12 | 2009-10-12 | Method for measuring porosity of paper pulp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101672764A true CN101672764A (en) | 2010-03-17 |
Family
ID=42020084
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910193124A Pending CN101672764A (en) | 2009-10-12 | 2009-10-12 | Method for measuring porosity of paper pulp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101672764A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103471974A (en) * | 2013-09-05 | 2013-12-25 | 东华大学 | Method for determining theoretic porosity of fabric through image method |
| CN103712900A (en) * | 2013-12-09 | 2014-04-09 | 青岛歌尔声学科技有限公司 | Method and device for detecting pore uniformity of tuning network |
-
2009
- 2009-10-12 CN CN200910193124A patent/CN101672764A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103471974A (en) * | 2013-09-05 | 2013-12-25 | 东华大学 | Method for determining theoretic porosity of fabric through image method |
| CN103712900A (en) * | 2013-12-09 | 2014-04-09 | 青岛歌尔声学科技有限公司 | Method and device for detecting pore uniformity of tuning network |
| CN103712900B (en) * | 2013-12-09 | 2016-09-07 | 青岛歌尔声学科技有限公司 | A kind of detection tuning conforming method and apparatus of mesh gap |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9611591B2 (en) | Soft, absorbent sheets having high absorbency and high caliper, and methods of making soft, absorbent sheets | |
| Jahangiri et al. | On filtration and heat insulation properties of foam formed cellulose based materials | |
| Svensson et al. | Preparation of dry ultra-porous cellulosic fibres: Characterization and possible initial uses | |
| Koponen et al. | Foam forming of long fibers | |
| Hubbe et al. | Rate-limiting mechanisms of water removal during the formation, vacuum dewatering, and wet-pressing of paper webs: A review | |
| CN101672764A (en) | Method for measuring porosity of paper pulp | |
| CN105334293B (en) | Flow state identification method and device for dense gas in multiple media | |
| CN109721743B (en) | Based on MoS2Color-changing anti-counterfeiting material of quantum dots and preparation method thereof | |
| CN211651727U (en) | Sampling detection device is used in wood pulp processing | |
| CN106596509A (en) | Portable raman-microscratch rapid detector integrated with wireless data transmission function | |
| Koponen et al. | Vacuum-assisted water removal from highly refined furnishes | |
| WO2021135250A1 (en) | Rapid measurement method for degree of fibrillation of nanocellulose | |
| AU716454B2 (en) | Procedure for determining the diffusion coefficient prevailing in the fibre wall in a suspension containing primary and secondary fibre and for determining the proportion and papermaking properties of secondary fibre | |
| Zhang et al. | A novel measurement of contact angle on cylinder-shaped lignocellulosic fiber for surface wettability evaluation | |
| CN103439216B (en) | Apparatus for determining gas content in paper-pulp fiber suspension | |
| CN101750237B (en) | Pulp sampling device for on-line measurement of whiteness of medium-concentration pulp | |
| Rainey et al. | Pressure filtration of Australian bagasse pulp | |
| Lederer et al. | Easy-use and low-cost fiber-based two-color dynamic light-scattering apparatus | |
| CN108548818A (en) | A kind of method and system of detection sheet uniformity | |
| CN208899249U (en) | Brightness of pulp sample preparation device | |
| CN109098045B (en) | Pulp brightness sample preparation method and preparation device | |
| CN107589242B (en) | A method of wood pulp cellulose deformation nature is evaluated using formula | |
| CN105091754A (en) | Portable cost-effective fiber analyzer | |
| CN202351106U (en) | Handsheet former provided with forming transfer screen | |
| CN206740346U (en) | Contactless stiffness of structural member detection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20100317 |