FI122242B - Method and instrument for the measurement of recycled fiber mass - Google Patents

Description

Method and instrument for the measurement of recycled fiber mass

Area

The invention relates to a method and a measuring device for measuring the recycled fiber mass of a recycled fiber process.

5 Background

The recycled fiber line, also called the RCF (Recycled Fiber) line, refers to a production process that transforms recycled paper into raw material for printing paper, mainly for newspapers and magazines. This process can also be called de-inking. Cardboard 10 and board can also be recycled and reused in a similar manner. The pulping, washing, dispersing and new washing of the recycled fiber process aims to separate the fibers of the recycled fiber pulp by chemical chemistry, at different stages to separate the materials added to the paper, such as printing ink, wax, glue, plastics, metallizing, etc. The process is complicated by the fact that the quality of the recovered paper varies according to where and how it was collected. In addition, the recycled paper contains impurities and its moisture content varies.

A sample of the recycled fiber process can be sampled and subjected to hyper-washing, in particular to remove ink present as free particles 20 in the sample. Hyper-washed samples taken at different stages of the recycled fiber process can be compared to the recycled fiber pulp at various stages of the recycled fiber process, thereby determining the efficiency of the treatment of the recycled fiber and the quality of the recycled fiber pulp.

Hyperwashing can be done by hand washing by taking the sample into 25 containers of the desired type with a wire at the bottom. However, different wires are used by different laboratories, which are usually between 50 and 200 mesh (aperture size about 70 µm to 300 µm). The sample on the wire is subjected to water rinsing, whereby particles smaller than the mesh size of the wire are discharged from the container.

^ 30 There are several problems with hand washing. For example, tanks, wires, display volumes, rinsing water temperature and rinsing water pressure are different in different (ta co §) measurements, which makes the different measurements non-comparable with each other. Also, perceptions of when hyperwashing has been done properly or correctly vary depending on the method of measurement and the performer of measurement 2, although the washing time and the amount of water used are known to influence the final result.

Hyperwashing can also be performed on a device made for this purpose. This solution also uses a wire (between 50 and 200 mesh) through which the pulp is filtered through flowing water. The imaging software can measure both the loose ink in the filtrate and the ink adhering to the fibers in the washed pulp.

There are also problems with this solution. The material, manufacturing geometry and wear of the wires affect the filtration and thus the measurement result. 10 It is impossible to produce and maintain identical wire geometries because even microscopic differences in wires affect the measurement and the manufacturing geometry changes with wear. Furthermore, since a single sample can be measured with only one wire, it is not possible to compare the result obtained with a sample with measurements made with different wires. The reproducibility of the solution 15 is also not very good.

Short description

An object of the invention is to provide an improved method and a measuring device implementing the method.

This is achieved by a method of measuring recycled fiber pulp produced by at least one of the following: paper, cardboard, cardboard, and at least one added substance being transferred to the surface of paper, cardboard, cardboard, and the method comprising sampling recycled fiber pulp from the fraktiointiputkessa. The method further comprises treating the sample as at least two fractions according to particle size such that the at least one fraction comprises a particle size range of 0.005 mm to 0.1 mm and measuring at least one parameter of at least one added substance of said at least one fraction.

The invention also relates to a method of measuring recycled fiber pulp produced by at least one of the following: paper, cardboard, £ 30 cardboard, and ink is transferred to the surface of paper, cardboard, cardboard and a method of sampling a recycled fiber pulp from a recycled fiber process. arranging the particles of the flowing sample according to the particle size o in the fractionation tube. The method further comprises treating the sample as at least two fractions according to particle size such that the at least one fraction comprises a particle size range of 0.005 mm to 0.1 mm and measuring at least one parameter of the ink of at least one of said fractions.

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The invention further relates to a measuring device for measuring recycled fiber pulp in a recycled fiber process, the manufacture of which comprises at least one of the following: paper, cardboard, cardboard, and at least one added substance transferred to the surface of paper, cardboard and cardboard. to receive a sample of the recycled fiber pulp from the recycled fiber process and to arrange the filing sample particles according to the particle size, the sensor, and the signal processing unit. The measuring device is adapted to process the sample in at least two fractions according to particle size such that the at least one fraction comprises particles in the size range of 0.005 mm to 0.1 mm, the sensor is adapted to measure at least one of said fractions, the signal processing unit is adapted to receive at least one parameter of at least one added agent of the measured fraction.

The invention further relates to a measuring device for measuring recycled fiber pulp in a recycled fiber process, the manufacture of which comprises at least one of the following: paper, cardboard, cardboard, and ink transferred to the surface of paper, board, cardboard and a fractionating tube adapted to receive recycle fiber pulp and arrange the particles of the flowing sample according to the particle size, the sensor and the signal processing unit. The measuring device is adapted to process the sample in at least two 20 fractions according to particle size such that at least one fraction comprises ink particles from 0.005mm to 0.1mm, the sensor is adapted to measure at least one of said fractions, the signal processing unit is adapted to receive the sensor measurement signal and at least one parameter of the ink of at least one measured fraction.

Preferred embodiments of the invention are described in the dependent claims.

The method and measuring device of the invention provide g many advantages. The measurement is independent of the wire, the wire manufacturing geometry, and the wire wire geometry changing over time. The results of a single measurement tu-x 30 can be adapted to measurements on different wires. The solution

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Repeatability is good and measurement conditions can be controlled,

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The invention will now be described in greater detail in connection with preferred embodiments, with reference to the accompanying drawings, in which: Figure 1 shows a recycled fiber process, Figure 2 shows a fractionator, 4 Figure 3 shows an optical measurement, Figure 4 shows different fraction distributions, and Figure 5

DESCRIPTION OF EMBODIMENTS 5 Let us first consider the recycled fiber process generally with reference to Figure 1. Initially, the recovered feedstock, such as newspapers, leaflets, or magazines, may be fed to a pulping subprocess 100, whereby the pulp is mixed with water so that the consistency of the recycled pulp, for example, is 5-18% depending on the pulp used. The purpose of the pulping subprocess is to chemically mechanically disintegrate the raw material into a recycled fiber mass in which the fibers and other substances such as ink are broken and separated into discrete particles.

The pulper may be, for example, a rotary pulper in which the pulp of recycled fibers rises up with the wall of the cylindrical pulper and drops down by gravity. During processing, the recycled fiber decomposes into ever smaller parts and eventually into fibers. The drop height of the recycled fiber mass depends on the speed of rotation of the drum. The pulp may rotate in the pulper for 20 to 40 minutes and, after passing through the pulper, will enter the target portion of the pulping subprocess, where it will be diluted, for example, to a level of 3.5%. Hereby, the largest impurities and non-degradable bodies such as rivets, pieces of plastic, etc. can be separated from the recycled fiber mass by means of openings (e.g., about 1 cm in diameter) on the screen portion. The pieces separated from the recycled fiber pulp end up in the waste conveyor.

Several chemicals can be fed into the pulping subprocess to separate the particles. Sodium hydroxide is used to increase the alkalinity of the coarse fiber pulp, for example to pH 9-10. The function of sodium hydroxide is to swell the fibers and, for example, to facilitate the removal of the printing ink. Water glass, or sodium silicate, in turn, also improves the release of, for example, x printing ink and prevents ink from re-attaching. At the same time, it buffers the pH to the desired level. Hydrogen peroxide, typically used for bleaching mas-S san, contributes to preventing pulp yellowing from pulping

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g connection. In addition, other chemicals may be used. Next, the recycled fiber can be washed in the washing part process 102. At this stage, the consistency of the recycled fiber pulp is usually reduced to about 1%, for example. Foaming can be used to remove small free particles from the recycled fiber mass. The wash removes particles of all sizes, but most particles in the size range of about 10 µιτι - 100 µm. In addition, the recycled fiber mass can be further filtered (for example, a filter opening of 2 mm) to remove unsuitable particles in the recycled fiber mass.

The function of the dispersion sub-process 104 is to further chemically and mechanically remove ink particles adhering to the fibers of the recycled fiber pulp. For mechanical treatment, the dispersion sub-process dispersion machine includes a stator and a rotating rotor whose blades shape the pulp. As the blades travel between the blades, the velocity of the pulp changes rapidly, whereby the fibers 10 are subjected to mechanical stress that releases ink from the fibers. At the same time, it is also intended to remove stickers from the fibers and to reduce the particle size of added materials such as ink particles.

Finally, the recycled fiber pulp may be washed once more in another preferred process 106. Again, flotation may be used to remove small free particles from the recycled fiber pulp.

Each of the different sub-processes 100-106 of the recycled fiber process can be controlled by a controller 108, to which measurement results can be fed from different points of the recycled fiber process. Controller 108 may utilize measurement data for subprocesses to optimize the operation of each subprocess separately 20, or to optimize interactions between different subprocesses to provide the best possible end product. The purpose of the recycled fiber process is to remove substances harmful to the recycled fiber mass. Often the focus is on removing ink. The fraction in which the recycled fiber pulp mus particles are located affects the ink removal and indicates the operation / success of the de-inking process. The size of free ink particles depends on how well the free ink can be removed from the recycled fiber process.

The sample (s) may be taken before at least one sub-process 100 to 106, during at least one sub-process 100 to 106, or after at least one sub-process 100 to 106.

x 30 All in all, the treatment of recycled fiber pulp

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“To separate the recycled fiber pulp fibers from the fibers, after the actual LO has been made, to transfer the added S substances, such as printing ink, wax, hydrophobic materials, plastics, metallization, etc., to the surface of the paper, board or cardboard, and

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^ to remove added substances from the recycled fiber pulp.

The mechanical-mechanical treatment of the pulping sub-process and the dispersion sub-process seeks to optimize, among other things: 6 how well the fibers have separated, whether the fibers are pulverized, how well the ink has been detached from the fibers and fillers and the coating paste and fine. The mechanical means for treating the pulping subprocess include, for example: flow rate of the pulp in the drum, i.e. production rate, consistency of pulp in the drum, and rotational speed of the drum. Chemical treatments for the pulping sub-process include, for example: pH of the pulp in the drum based, for example, on the addition of sodium hydroxide, the proportion of silicate, and consistency of the pulp (amount of water).

In dispersion, the separation of fibers and ink can be effected primarily by mechanical means, which include: flow rate of the pulp through the dispersion process, i.e. production rate, consistency of pulp in the dispersion process, temperature of pulp in the dispersion process, rotor rotation speed. The amount of power supplied to the rotor is typically controlled by controlling the opening between the rotor and the stator through which the pulp must pass.

Many of the substances transferred to the surface also remain on the surface of paper, cardboard or cardboard. These include, for example, printing ink, plastic or metal. An example of metal use is aluminum coated paper. Other substances may be partially or completely absorbed in the paper after transfer to the surface. These may include wax, some (weight) inks, and hydrophobic agents (such as glue).

The material to be added can be applied to the surface of paper, cardboard or cardboard by pressing, spraying, spreading or brushing. In addition, the added substance can be transferred by various evaporation methods. The transfer may also be accomplished by immersing the paper, cardboard or cardboard in the material to be added, or the material to be added may be glued or melted to the paper, board or cardboard.

Common to the transfer is that the paper, cardboard, or cardboard is itself ready, and one or both sides of the surface of the paper, cardboard, or cardboard are often transferred to its surface, often according to its intended use. Thus, paper, cardboard or cardboard has already come out of the paper machine and possibly 30 from the paper mill. After that, ready made paper, cardboard or

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“Cardboard can go into processing where the material to be added is transferred to the surface of paper, cardboard or already cardboard. For example, if the cardboard is to be made into a packaging containing liquid o °, the finished cardboard can be coated with plastic and the plasticized cardboard 35 can be shaped into a container of the desired shape, which after filling the container can be sealed by gluing. In addition, text and / or pictures can be printed on the cardboard or plastic surface with ink. The carton of this example can contain three different added materials: plastic, glue, and ink.

Figure 2 illustrates an apparatus for fractionation that functions like a chroma-5 tograph. A sample of the recycled fiber process may be fed through valve 202 into a tube 204 where the pressure, flow, and temperature of the water pushing the sample forward may be controlled by controller 200. Through valve 202, the desired chemical may also be added to the sample. . For example, the fibers may be stained with a hydrophobic dye to leave the wax in the sample unstained and thus lighter.

The fractionation tube 204 may be tens or hundreds of meters long and have a diameter of a few millimeters to tens of 15 centimeters. The tube 204 may be made of a polymer such as plastic, metal, etc. When the sample in suspension flows in the tube 204, the solid particles of the sample will be aligned with the particle size such that the largest particles accumulate in the front and the smallest particles. The large particles thus file faster than the small particles 20. The particles of the sample may be arranged in fractions of particle size, each containing particles falling between the desired upper and lower limits.

The filing sample may be imaged with at least one camera 206 and optical radiation source 208. Optical radiation refers to electromagnetic radiation from ultraviolet (about 50 nm) to infrared (about 200 µm). From the camera 25,206, the image or images may be transferred to an image processing unit 210, wherein the resulting image or images may be transmitted to a display 212. The image processing unit 210 includes a processor, memory and one or more computer programs required to perform image processing. The image or images may also be transmitted to the display ^ 212 directly from the camera 206 without processing x 30 in the image processing unit 210. Each image can be a still image or a video image. Each fixed

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“A picture can represent one fraction, or a picture representing 5 one fraction can be formed or selected from a set of pictures. The video image, in turn, may be a series of solid images C \ lg representing the sample from the beginning of the sample to the end of the sample. In this case, as the image progresses from the first image (the image of the largest particles at the beginning of the sample), the image-to-image average particle size decreases. In addition, the consistency of the fractions can be measured optically by taking advantage of the attenuation of the 8 optical rays and possibly additionally a change in polarization.

Fractions can be sampled into sample containers 214-220, which may be N, where N is a positive integer and N is equal to or greater than 2. Each fraction in sample vessel 214-220 can be measured in the laboratory or fractions can be measured as in the 204 sample stream. using one or more optical measurement methods.

The measuring device may further comprise a cake forming unit 222 for converting fractions in containers 214 to 220 into cakes 224. The cake unit 10 222 may comprise a container with a wire at the bottom and a drying device such as a suction unit and oven for drying the wire-filtered fraction to a solid.

Measurements describing fiber properties include, for example, fiber length measurement, fiber length distribution measurement, fiber bundle measurement, and brightness measurement. Of these, the brightness measurement can also measure the property of the ink 15 (the ink is attached to the fibers).

Optical measurements of particle properties can be performed spectroscopically or by image analysis, and measurements may be made on a filing sample or on cakes made from sample fractions. Optical measurements may be absorption, reflectance, or scattering measurements, in which the polarization of optical radiation can be utilized.

The particle size, such as fiber length or ink particle diameter, can be measured using a line or matrix camera. The measurement may be related to the number, proportion, size or size distribution of free ink particles and the number, proportion, size or size distribution of ink particles adhered to the fibers.

> Measurement of total ink in the mass, i.e. effective ink, can be performed using optical radiation measurement, such as the Effective Residual Ink Concentration (ER) method. The optical radiation in the desired band is then applied to the pulp or cake and measured x 30 diffused radiation. Optical radiation may be infrared radiation, the band of which may be chosen such that the ink absorption coefficient of the ink in the pulp is higher than that of the fibers or other particles in the pulp.

The infrared radiation band may be, but not limited to, 700 nm to 1500 nm.

In addition, it is possible to measure the amount or proportion of ink adhered to the fibers and the amount or proportion of free ink 9 released from the recycled fiber mass. The measurement can be made optically by forming an image from which, by means of a suitable image processing program, the number, proportion and / or ratio of particles of different sizes and colors can be determined. Such a solution is disclosed in US 6,010,593, which describes this measurement in more detail.

Figure 3 shows a general principle of optical measurement methods.

The recycled fiber mass 300 is guided to the transparent tube 302 at the wavelength used in the optical measurement. As the recycled fiber mass advances in the tube 302, the recycled fiber mass is illuminated by optical radiation provided by the optical power source 304. The optical power source 302 may be an LED, a filament lamp, a ka-10 discharge lamp, a laser, and the like, and the optical power source may illuminate the subject in a pulsed or continuous manner. A camera 306, which may be a Charge Coupled Device (CCD) camera or Complementary Metal Oxide Semiconductor (CMOS) camera, for example, takes a picture or pictures of recycled fiber pulp 300 in tube 302 either on the same side as the optical power source or 15 from the fireplace side. In addition, the camera 306 can also be imaged using radiation scattered from the recycled fiber mass. The image processing unit 308 can control image acquisition and subject illumination and perform image processing and analysis. For measuring the length of the fibers and the size of the ink particles, a capillary tube having a diameter of less than a millimeter to a few millimeters to 20 meters can be used as a tube 302. In other measurements, the diameter of the tube 302 may be larger, up to tens of centimeters.

Instead of a camera 306, a spectrometer can be used as a sensor 206 to determine the spectrum of optical radiation reflected by each fraction. From the spectrum, the color, lightness, etc. of the particles can be determined and thus the desired parameter to be measured.

Instead of that shown in Figure 3, source 304 may apply some appropriate energy to each fraction to provide an acoustic response signal in the sample particles. The source 304 may be, for example, a laser whose optical radiation causes acoustic vibration of the particles. Similarly, instead of the camera 306, the x 30 sensor 206 can detect acoustic vibration. Usually acoustic vibration

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is ultrasound. The frequency, amplitude and / or phase of acoustic radiation depend on the properties of the particles, i.e. the parameter being measured.

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Figure 4 shows the attenuation of optical radiation as a function of the amount of water discharged in the fraction droplet. Curve 400 represents the measurement prior to the washing part process of the 35 recycled fiber process, curve 402 represents the wire washing process and curve 404 represents the measurement result after the preferred process of the recycled fiber process. The vertical axis has the optically measured damping ATT and the horizontal axis has the amount of water drained in L liters. The attenuation ATT may be related to the consistency of the sample and thus to the solids content of the various parts of the sample. The amount of water is inversely related to the particle size 5 and can be measured by starting the measurement as the sample enters the fractionation tube and measuring the volume once the desired sample point or fraction has been drained to the measuring point. The metering point can be an area within the camera imaging sector. The more water flowing through the fractionation tube, the longer the sample distribution becomes and the more precisely the particles of different sizes 10 separate. From the number of liters, sample length I can be estimated as follows: I = (M1 - M0) / A, where M1 is the last fraction of the last fraction (about 20 L = 20 dm3 in the example of Figure 4), MO is the starting point for fractionation (about 16 L = 16 dm3) and A is the cross-sectional area of the fractionation tube (about 0.08 dm2 in the example of Figure 4). This results in a fractionated sample length of approximately 200 dm = 20 m in the example of Figure 4. When the sample was taken, the sample was only about 25 cm long, so that the fractionation tube stretched the sample by about 75 times. If the sample is flowing at about 1 m / s, the sample will pass the optical measurement in about 20 to 20 seconds. If the camera takes pictures at 20 msec, which corresponds to an image capture at 2 mm intervals, 1000 still images are obtained from the sample, or 1000 image fractions, which produce 20 seconds of video at successive speeds. Only a few fractions may be needed, for example four (FR1 - FR4), so each result measured from the fractions can represent an average of up to 250 images of the particles in the 25 samples. Similarly, each fraction can be represented by one representative image without averaging. In any case, the limits and amounts of fractions can be freely selected from the captured images, g One mode of fractionation is shown in Figure 4 and in this example four fractions are used. The largest particle fraction FR1 comprises particles x 30 set liters between 15.6 L and 16.3 L (size range, for example, 5 mm to 2 mm), cc the second largest particle fraction FR2 comprises particles per liter between 16.3 L and 17 liters. , 5 L (for example, size 2mm - 0.5mm), the second smallest

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The FR3 fraction of g small particles contains particles in a liter range from 17.5 to 18.3 L (size range for example 0.5 mm to 0.1 mm) and the FR4 fraction of the smallest particles 35 contains particles in a range from 18.3 L to 20.4 L L (size range, for example, 0.1 mm to 0.005 mm).

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In the case of Figure 4, the FR1 fraction of curve 400 may comprise flakes, the FR2 fraction may be long fibers, the FR3 fraction may be short fibers, and the FR4 may contain ink particles, fines, and any other small matter particles, typically the ink particles are recycled fibers. significant for use. The FR4 ink particles are in the size range of 10 µιη to 100 µm, which are usually largely removed by the washing part process of the recycled fiber process, or should be (almost) completely removed by hyperwashing. A result similar to this can be seen in the curve 402, which shows the result of hyper-washing on the wire. Since no particles remain in FR4 in 10 complete hyperwashing, curve 400 for FR4 can be set to predetermined values in the image processing unit, and the resulting distribution is referred to as a reference for washing in the recycled fiber process. If different fractions of the sample are collected in tanks 214-220, as shown in Figure 2, the contents of tanks 214-218 can be combined (in this case, the fraction of tank 220 has been filtered out of the sample) to provide a concrete reference for hyper-washing the sample. The measurement result 404 of a sample taken from the washing part process 102 (or 106) of the recycled fiber process can be compared to a reference having a distribution 400 in fractions FR1 to FR3 and having a constant value 0 in fraction FR4. The comparison can be performed, for example, by using a kor-20 relation. If the difference between the reference and the measurement result 404 is greater than a predetermined threshold, the recycled fiber process does not work well enough and the quality of the end product does not meet the desired quality requirements. In this case, the operation of the recycled fiber process must be enhanced. If the difference is below the threshold value, the operation of the recycled fiber process can be considered optimized and the quality of the final product 25 sufficiently good.

In general, any actual sub-process of a recycled fiber process can be compared to a corresponding reference. Hereby, the measurement of at least one parameter of at least one added substance may be accomplished by determining the difference between the distribution of at least one fraction measured after the desired subprocess and ex x 30 the given distribution. The predetermined distribution then represents the desired distribution after the sub-process of the desired recycled fiber process.

The sample may be processed into at least two fractions by imaging the camera 206 on different particle sizes of the sample in the fractionation tube 204 and forming at least one image of the images formed by the camera 206 in the image processing unit 210. Alternatively or additionally, at least two fractions from the hate sample in fraction tube 204 may be formed into containers 214-220 and depicted by camera 206 at least one fraction contained in a container 214-220. Further, alternatively or additionally, at least one fraction may form cake 222 and one fraction cake.

The parameter to be measured may represent the proportion of at least one substance added to the fibers in the sample. The parameter to be measured may also represent the proportion of at least one added substance present in the sample. In addition, both of the above parameters can be measured.

Figure 5 shows a flow diagram of the method. In step 500, sample 10 is taken from the recycled fiber pulp of the recycled fiber process into a fractionation tube. In step 502, the particles of the sample flowing are arranged according to the particle size in the fractionation tube. In step 504, the sample is treated as at least two fractions according to particle size. In step 506, at least one parameter of the at least one added agent of the at least one fraction is measured.

While the invention has been described above with reference to the examples in the accompanying drawings, it is clear that the invention is not limited thereto, but that it can be modified in many ways within the scope of the appended claims.

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Claims (24)

A method for measuring a recycled fiber pulp, for the preparation of which has been used at least one of the following: paper, cardboard, cardboard, and to the surface of the paper, cardboard, paperboard, at least one added substance is moved and in the process taken ( 500) a sample from the recoverable fiber pulp of the recycling fiber process into a fractionation tube (204); (502) the particles are arranged in the flow sample according to particle size in the fractionation tube (204), characterized in that the sample is treated (504) as at least two fractions of particle size, such that at least one fraction comprises particles of the size class 0.005 mm -0.1 mm of at least one parameter is measured (506) for at least one added substance in at least one fraction. 2. A method for measuring recoverable fiber pulp, for the manufacture of which at least one of the following has been used: paper, cardboard, cardboard, and to the surface of the paper, cardboard, paperboard, ink is removed and in the process (500) a sample is taken from the recycled fiber process's pulp. to a fractionation tube (204); (502) the particles are arranged in the particle-flowing sample in the fractionation tube (204), characterized in that the sample is treated (504) as at least two particle size fractions, such that at least one fraction comprises ink particles of size 10 class. pm-100 pm; At least one parameter is measured (506) for the ink in at least one fraction. • 'sT 1 3. A method according to claim 1, characterized in that the sample CC is treated as at least two fractions, such that with a camera (206) photoin the various particle sizes of the sample flowing in the fractionation tube (204) are graphed; and is formed with an image processing unit (210) at least one image which o represents at least one fraction of the images formed by the camera (206). 4. A method according to claim 1, characterized in that at least two fractions are formed from the sample flowing in the fractionation tube (204); at least one fraction is photographed; and from at least one image formed, at least a few meters are measured for at least one added substance in at least one fraction. Method according to claim 1, characterized in that at least one fraction forms a cake (222); said at least one cookie formed from the fraction is photographed and from at least one image formed, at least one parameter for at least one added substance is measured in at least one fraction. 6. A method according to claim 1, characterized by decreased spectrometric at least one parameter for at least one added substance in at least one fraction. The method of claim 1, characterized by decreased energy being directed to produce an acoustic response signal in the particles of the fraction; and acoustically, at least one parameter is measured for at least one added substance in at least one fraction. 20 8. A method according to claim 1, characterized in that a parameter is measured which describes the proportion of at least one added substance solid in the fiber in the sample. 9. A method according to claim 1, characterized in that a parameter is measured which describes the proportion of at least one of the fibers dissolved in the sample. o CM Method according to claim 1, characterized in that the measurement of the parameter is carried out by determining the difference of the distribution of at least one fraction measured according to a desired subprocess and a g predetermined distribution, where the predetermined distribution describes the The desired distribution according to the subprocess of the desired recovery fiber process. CO o Method according to claim 1, characterized in that a dye is added to the sample to facilitate the measurement of the added substance. 12. A method according to claim 1, characterized in that the added substance is at least one of the following: ink, plastic, wax, metal, hydrophobic substance. 13. Measuring device for measuring in a recoverable fiber process a recoverable fiber pulp, for the manufacture of which has been used at least one of the following: paper, cardboard, cardboard, and to the surface of the paper, cardboard, paperboard, at least one added substance and the measuring device have been moved. comprises a fractionation tube (204) arranged to receive a sample from the recoverable fiber mass of the recovery fiber process and arrange the particles in the flow sample according to particle size, a sensor (206) and a signal processing unit (210), characterized in that the measuring device arranged to treat the sample as at least two fractions of particle size, such that at least one fraction comprises particles from the size class of 0.005 mm-0.1 mm; the sensor (206) is arranged to measure at least one fraction; the signal processing unit (210) is arranged to receive the measurement signal of the sensor (206) and determine the at least one parameter for the at least one added substance in the at least one measured fraction. 14. Measuring device for measuring in a recycled fiber process a recycled fiber pulp, for the manufacture of which has been used at least one of the following: paper, cardboard, cardboard, and to the surface of the paper, cardboard, paperboard, the ink has been moved and the measuring device comprises a fractionation tube (204 ), which is arranged to receive the sample from the recoverable fiber mass of the recovery fiber process and arrange the particles of the flowing sample according to particle size, a sensor (206) and a signal processing unit (210), characterized in that the measuring device is arranged to treat the sample as at least two fractions according to particle size, such that at least one fraction comprises ink particles of the size class 10 μιτι-100 µm; The sensor (206) is arranged to measure at least one fraction; the signal processing unit (210) is arranged to receive the measurement signal from the sensor (306) and determine at least one parameter of the ink in the at least one measured fraction. Measurement device according to claim 13, characterized in that the measuring device is arranged to treat the sample as at least two fractions, such that a camera (306) in the form of a sensor (206) is arranged to photograph different particle sizes of the sample flowing in the sample. the fractionation tube 5 (204); and the signal processing unit (210) is arranged to determine from at least one image formed by the camera (306) representing at least one fraction at least one parameter for at least one added substance. Measurement device according to claim 13, characterized in that the sensor (206) is a camera (306) arranged to photograph at least one fraction; and the signal processing unit (210) is arranged to determine from at least one image formed by the camera (306) representing at least one fraction at least one parameter for at least one added substance. The measuring device according to claim 16, characterized in that the measuring device is arranged to form from at least one fraction a cake (222); and the camera (206) is arranged to photograph said at least one cookie formed from the fraction; and the signal processing unit (210) is arranged to determine from at least one image formed by the camera (306) which represents at least one fraction at least one parameter for at least one added substance. 18. A measuring device according to claim 13, characterized in that the sensor (206) is a spectrometer arranged to measure at least one fraction; and the signal processing unit (210) is arranged to determine from the signal formed by the spectrometer (206) which represents at least one C \ J fraction at least one parameter for at least one added substance. cp The measuring device according to claim 13, characterized in that the measuring device comprises a cold (304) for directing energy towards the fraction of 30 for providing an acoustic response signal in the sample particles; The S sensor (206) is an acoustic sensor, which is arranged to receive C \ | g the acoustic signal coming from at least one fraction; and the signal processing unit (210) is arranged to determine from at least one signal formed by the sensor (206) which represents at least one fraction at least one parameter for at least one added substance. The measuring device according to claim 13, characterized by the signal processing unit (210) being arranged to measure a parameter which describes the proportion of at least one added substance fixed in the fibers in the sample. Measurement device according to claim 13, characterized in that the signal processing unit (210) is arranged to measure a parameter which describes the proportion of at least one added substance dissolved from the fibers in the sample. The measuring device according to claim 13, characterized in that the signal processing unit (210) is arranged to measure a parameter by determining the difference of the distribution of at least one fraction measured after a desired subprocess and a predetermined distribution, being the predetermined distribution. describes the desired distribution according to the sub-process of the desired recovery fiber process. 23. Measuring device according to claim 13, characterized in that the measuring device is arranged to add a dye in the sample to facilitate the measurement of the added substance. The measuring device of claim 13, characterized in that the added substance is at least one of the following: ink, plastic, wax, metal, hydrophobic. δ (M (M O sj- X Χ CL Sj- in) M tn CD o o {M