Color management system

Abstract

To provide a color management system that measures colors before papermaking processes and reflect in preparing raw materials for colored papers.SOLUTION: A branching channel 31 of a raw material feeding channel 41 is connected with a cylinder press 1. In the cylinder press 1, a dye-added paper stock slurry is dewatered, sheeted, and extruded as a WET sheet S on a take-out conveyor 32. In the cylinder press 1, by lowering rotary speed of a dewatering drum, a transfer speed of the WET sheet S on a take-out conveyor 32 is lowered to be close to a settling condition. A colorimeter 35 is arranged above the take-out conveyor 32. In a controller for control, scheduled "color" is set with a range, and if a numeric value of a color information from the colorimeter 35 is shifted from the center of the scheduled "color", the overall operation is not stopped as long as the shift is in an allowable range, and processes of discharge rates of pumps (M), (M), ... are changed in the direction of correcting the shift.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a color management system that can measure and manage color before the papermaking process in the production of colored paper. [Background technology]

[0002] When producing colored paper, dyes are added and mixed into the paper stock slurry and allowed to settle before the papermaking process. However, paper pulp is a natural product, and even if it is bleached, it does not become uniformly white. In addition, the dyes used are often mixed and fixed to obtain the desired color, but the affinity for the paper pulp varies depending on the dye. For these reasons, if multiple dyes are added to the continuously fed paper stock slurry according to a preset procedure, the optimal blending conditions for the dyes may change during the process, and the "color" of the paper after it is made and dried may differ from the expected one. Conventionally, the "color" of the paper was inspected after it was made and dried, and if the "color" was different from what was expected, the entire process, including the papermaking process, was stopped at that stage and measures were taken such as changing the procedure. However, responding at this stage already requires a great deal of energy and is wasteful.

[0003] In the concentrating dehydrator shown in Patent Document 1, when the pulp slurry is fed into the raw material storage tank from the raw material inlet, the moisture flows into the inside through the wire mesh on the outer periphery of each of the pair of dehydration drums and the holes in the punched metal. As the dehydration drums rotate, the fibers are carried upward while being caught by the edge of the holes and the wire mesh, and are compressed between the movable dehydration drum and further dehydrated by the elastic pressure of the movable dehydration drum against the fixed dehydration drum, and the fibers on the movable side are drawn to the fixed side and become a kind of sheet. This is peeled off by the doctor, so the sheet state is maintained at that point. Then, the material is transported to the next process. Meanwhile, the moisture is drained from the drainage port.

[0004] In addition, the concentrating and dehydrating machine shown in Patent Document 2 retains the basic configuration of the concentrating and dehydrating machine described in Patent Document 1, but by changing the location of the drain outlet and adopting a waterproof connection structure, the dehydrating effect is further improved. The types of concentrating and dehydrating machines described in Patent Documents 1 and 2 achieve a high concentration and dehydration effect by filtering and draining the water in a dehydration drum by setting the water level, and by concentrating and dehydrating the water by pushing against each other at the contact points between the wire meshes.They are also cost-effective because they use a natural vacuum system. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 3433905 [Patent Document 2] Patent No. 7208618 Summary of the Invention [Problem to be solved by the invention]

[0006] Recently, the performance of colorimeters has improved, and it is now possible to measure the color even before the paper has been made into paper through the papermaking process, as long as the paper has been sufficiently dehydrated and turned into a wet sheet. The present invention has been made with a focus on the above-mentioned conventional problems, and has as its object to provide a new and useful color management system that utilizes the concentrating and dehydrating machines described in Patent Documents 1 and 2 as a sample preparation machine for measuring color before the papermaking process in colored paper production, making it possible to measure color before the papermaking process and reflect the results in adjusting the raw materials for colored paper. [Means for solving the problem]

[0007] The present invention has been made to solve the above-mentioned problems, and is a color management system characterized by comprising a sample preparation branch flow path branched off from a raw material feeding flow path that feeds colored paper raw material, to which dye has been adjustably added to a paper slurry, into a seed box; a sample preparation unit connected to the sample preparation branch flow path that dehydrates the colored paper raw material for sample preparation to prepare a wet sheet sample; a color measurement unit that measures the color of the sample; and an adjustment means for adjusting the amount of dye supplied based on the color measured by the color measurement unit.

[0008] Preferably, the adjusting means adjusts the discharge amount of a pump inserted in a dye addition flow path connected to the raw material feed flow path, based on the color measured by the color measuring section. More preferably, the predetermined color is set within a range, and the adjusting means adjusts the pump discharge rate by automatic control so as to fall within the range.

[0009] The sample preparation unit of the present invention preferably comprises a raw material storage tank for storing raw material for colored paper, a pair of dehydration drums arranged in parallel within the raw material storage tank and compressing the raw material for colored paper that comes between them by periodic elastic contact and reverse rotation, and a cylinder press equipped with a raw material supply port arranged in the raw material storage tank and communicating with the underside of the dehydration drums, and a drain port arranged in the raw material storage tank and communicating with the inside of the dehydration drums, and the raw material for colored paper is drawn from between the pair of dehydration drums toward one of the dehydration drums and comes out as a wet sheet.

[0010] Preferably, the cylinder press is characterized in that it comprises a rubber-like closing member that protrudes like a sheet flap at the same height from the inner surface of the raw material storage tank toward the outer peripheral surfaces of a pair of dehydration drums, and whose tips contact the outer peripheral surfaces over their entire length, thereby closing the gap between the inner surface of the raw material storage tank and the outer peripheral surfaces of the dehydration drums and separating the upper and lower parts, and a raw material supply amount adjustment means that adjusts the amount of raw material supplied from the raw material supply port, and the raw material supply amount adjustment means adjusts the raw material supply amount depending on the contact condition of the raw material with the rubber-like closing member. More preferably, the cylinder press has a plurality of raw material supply ports provided below each of the pair of dehydration drums and spaced apart in the axial direction of the dehydration drums. Effect of the Invention

[0011] The color management system of the present invention makes it possible to measure color before the papermaking process, thus preventing the waste of colored paper that has been dyed a different color than expected through the papermaking process. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a top view of a cylinder press according to an embodiment of the present invention (however, the left dehydration drum, the left rubber sheet, and the left and right flat belts are omitted). [Diagram 2] FIG. 2 is a side view of the cylinder press of FIG. [Diagram 3] 3 is a side view of the cylinder press of FIG. 1 in a direction different from that of FIG. 2. [Figure 4] FIG. 2 is an explanatory diagram of the processing operation of the cylinder press of FIG. 1. [Diagram 5] 1 is a partial configuration diagram of a colored paper manufacturing system incorporating a color management system according to an embodiment of the present invention. [Figure 6] FIG. 6 is a configuration diagram of the color management system of FIG. 5. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] A cylinder press 1 according to an embodiment of the present invention will be described with reference to FIGS. Reference numeral 2 denotes a base, and a fixed table 3 is fixed to the right side of the base 2. A tilting table 4 is provided on the left side of the base 2. The tilting table 4 is capable of tilting with a support shaft 5 as a fulcrum. The base 2 is also provided with an air spring 6, which supports the left end of the underside of the tilting table 4 and causes it to tilt by expanding and contracting due to pressure increase and pressure decrease of the air spring 6.

[0014] Reference numeral 7 denotes a raw material storage tank, which is composed of a fixed tank 8, a tilting tank 9, and an expandable section 10 connecting the fixed tank 8 and the tilting tank 9. The fixed tank 8 is supported by a fixed base 3, and the tilting tank 9 is supported by a tilting base 4. The bottom surfaces of the fixed tank 8 and the tilting tank 9 are shaped like a half-circular arc, and on the bottom surfaces thereof, there are provided raw material supply ports 11. These raw material supply ports 11 are provided in parallel to the axial direction of each of the fixed tank 8 and the tilting tank 9, three each, at predetermined intervals. The raw material supply ports 11, 11, ... are connected to a header pipe 12 directly attached to a pump by hoses 13, 13, .... The header pipe 12 is connected to a raw material supply path.

[0015] Two dehydration drums 14, 14 are housed side by side in a nearly horizontal position in the raw material storage tank 7. One dehydration drum 14 is housed in the fixed tank 8 of the raw material storage tank 7, and the other dehydration drum 14 is housed in the tilting tank 9, and they are housed so that they have similar semicircular arc-shaped bottom surfaces. The dehydration drums 14, 14 are rotated in opposite directions around their axes by motor drive. The dewatering drum 14 is made of perforated metal and has many water holes. Two types of wire mesh are stretched around the outside of the drum, a lower mesh and an upper mesh. The mesh of the upper mesh on the fixed tub 8 side is finer than that on the tilting tub 9 side.

[0016] Both axial end faces of the dehydration drum 14 are provided with an annular drum-side ridge 15. Also, an annular storage tank-side ridge 16 protrudes from the inner surface on the raw material storage tank 7 side. The drum-side ridge 15 and the storage tank-side ridge 16 are butted against each other coaxially. A waterproof flat belt 17 is wound around the drum-side ridges 15 and the storage tank-side ridges 16. One end of the flat belt 17 in the length direction is fixed to the raw material storage tank 7 side, and the other end is pulled upward and fixed in a tensioned state. Due to this waterproof connection, the water passage hole serves as the only inflow path between the inside and outside of the dehydration drum 14.

[0017] A flat, band-like rubber sheet 18 is disposed as a closing member from the inner surface of the flat portion of raw material storage tank 7 so as to protrude toward the outer circumferential surface of dehydration drum 14. One widthwise side of this rubber sheet 18 is placed on a mounting plate 19 fixed to raw material storage tank 7, and while sandwiched between presser plates 20, it is fixed in place by screws using the screw holes of mounting plate 19 and the through holes of presser plate 20 and rubber sheet 18. The tip of the other side forms a free end 18a. The rubber sheet 18 is aligned at the same height toward the outer circumferential surface of the dewatering drum 14 over its entire length, and as the dewatering drum 14 rotates about its axis as indicated by the arrow, the rubber sheet 18 is pressed against the outer circumferential surface of the dewatering drum 14 and bends almost vertically, resulting in a hook shape when viewed from the length direction. Furthermore, the repulsive force of the rubber is applied, so that the surface contact portion adheres closely to the drum surface.

[0018] Both the fixed tank 8 side and the tilting tank 9 side are configured as described above, but the tilting tank 9 side is different in that a pressure sensor is provided on the mounting plate 19. As an example, a GP-M series environmentally resistant digital pressure sensor from Keyence Corporation is used as the pressure sensor. The mounting plate 19 has a portion on the tank side where the rubber sheet 18 and the holding plate 20 are not placed, and the threaded portion of the pressure sensor is screwed into a screw hole formed in that portion to secure it in place. The pressure sensor has a pressure receiving surface formed on the inside of the threaded portion, and detects the pressure on the lower side that is partitioned and closed off by the rubber sheet 18 when screwed in.

[0019] Raw material storage tank 7 has a portion surrounded by a circular ring by a waterproof connection with dehydration drum 14, and a drain outlet 21 communicating with the outside is formed by cutting out a rectangular shape in the lower portion of the circular ring. A doctor 22 and a scraper 23 are provided on the upper side of the dehydration drum 14 on the fixed tank 8 side, and a raw material overflow port 24 is provided on the side of the dehydration drum 14 on the tilting tank 9 side. Raw material overflowing from the raw material overflow port 24 is circulated to the raw material storage tank 7. This raw material overflow port 24 is provided at approximately the same height as the rubber sheet 18, and does not function when the rubber sheet 18 is attached.

[0020] The pump and pressure sensor directly attached to the header pipe 12 are connected to a control controller (not shown). The control controller is composed of a storage medium such as memory, a CPU, a microcomputer equipped with an input / output unit, and the like, and a target pressure is set, and the rotation speed of the drive motor is controlled by inverter control so that the target pressure is maintained based on the detection data from the pressure sensor, thereby adjusting the suction force of the pump. The raw material supply amount adjustment means is configured in this way, and the amount of raw material supplied from the raw material supply port 11 to the raw material storage tank 7 is adjusted so that the pressure on the lower side covered with the rubber sheet 18 is constant.

[0021] The cylinder press 1 is constructed as described above, and during operation, as shown in Fig. 2, the dehydrating drum 14 on the fixed vat 8 side rotates clockwise around its axis, and the dehydrating drum 14 on the tilting vat 9 side rotates counterclockwise around its axis and tilts repeatedly around the support shaft 5. As a result, the dehydrating drum 14 on the fixed vat 8 side is periodically pressed against the dehydrating drum 14 on the tilting vat 9 side, compressing anything sandwiched between them. Raw material L is continuously supplied from raw material supply port 11 of raw material storage tank 7 and comes into contact with the lower surface of rubber sheet 18, and a constant internal pressure is maintained on the lower side thereof due to the supply of raw material.

[0022] Under such circumstances, when the above operation is performed, dehydration through the water holes of the dehydration drum 14 and elastic compression between the dehydration drums 14, 14 are performed in sequence in a time series, and as shown in FIG. 4, the moisture W in the raw material L moving toward the dehydration drum 14 by natural vacuum flows into the inside of the dehydration drum 14 through the water holes of the dehydration drum 14 and is discharged from the drainage outlet 21. The fiber content F that could not enter the inside of the dehydration drum 14 is attached and piled up on the wire mesh. This fiber content F is carried to the point where the dehydration drums 14, 14 elastically contact each other, where it is compressed and dehydrated to a high concentration all at once. Then, this dehydrated fiber content F is transferred to the dehydration drum 14 on the fixed tank 8 side, where a fine upper mesh is stretched, and adheres to the dehydration drum 14 in the form of a single sheet, and is peeled off by the doctor 22 at a position rotated about 120 degrees to become a wet sheet S.

[0023] Since multiple raw material supply ports 11 are arranged in a well-balanced manner, the wet sheet S is dewatered uniformly in the width direction, which results in a uniform thickness and concentration in the width direction. In addition, the dewatering drum 14 is connected waterproofly with a flat belt 17, which prevents the fiber content F from being wasted from the dewatering drum 14, and the use of a rubber sheet 18 enables smooth dewatering even if the raw material L is poor in drainage due to the addition of a dye to the paper stock slurry. Thereafter, if the scraping device 23 is used, the wet sheet S is crushed into small pieces. If the wet sheet S is directly placed on the take-out conveyor 32 instead of using the scraping device 23, the wet sheet S will be transported with the plate surface facing up. If the wet sheet S is cut by an online cutter and further stacked on a pallet, it becomes easy to handle, but it also becomes a wet sheet S that can be measured by a colorimeter 35. Moreover, even if the raw material L has poor drainage due to the addition of dye, it can be sufficiently dehydrated as described above, so it is a suitable sample for checking the "color" before the colored paper making process. Furthermore, the cylinder press 1 has a simple structure and can be easily miniaturized, even in a size of about 30 cm in width.

[0024] In the present invention, the colored paper manufacturing system incorporates a color monitoring system which produces the above-mentioned wet sheet sample using the cylinder press 1, measures the sample using a colorimeter 35, and reflects the measurement results in the colored paper manufacturing process, thereby reducing waste after the papermaking process. As shown in Fig. 5, in this colored paper manufacturing system, three seed boxes for paper machines are provided, and raw material feed passages 25a, 25b, and 25c to which pulp slurry is supplied are connected, respectively. Note that, although this embodiment is for three paper machines, the present invention is not limited to this, and there are also cases where there is one or two paper machines. Hereinafter, when there is no need to distinguish between 25a, 25b, and 25c, it will be written as "41". Three dye-adding passages 26a, 26b, and 26c are connected to each of the raw material feed passages 41, and dyes are added to the stock slurry. An in-line mixer 27 is installed downstream of the connection, and the stock slurry to which the dyes have been added is thoroughly mixed before being sent to the seed box.

[0025] The No. 1 type box is supplied with pulp slurry that has been conditioned from the finishing chest via the No. 1 machine chest. The No. 2 and No. 3 type boxes are supplied with pulp slurry that has been conditioned via the No. 2 and No. 3 machine chests and comes out from separate outlets. The dye addition flow paths 26a, 26b, and 26c are connected to service tanks for each dye color (red, blue, and green) to supply the dye, and dilution flow paths 28a, 28b, and 28c are connected to the dye addition flow paths 26a, 26b, and 26c to which water is supplied from a fresh water tank to dilute the dye. An in-line mixer 29 is installed downstream of the connection, and the diluted dye is thoroughly mixed and then supplied to the raw material feed flow paths 25a, 25b, and 25c. A predetermined "color" is created by mixing a plurality of dyes, and each raw material feed channel 41 is connected to three dye addition channels 26a, 26b, and 26c. Hereinafter, when there is no need to distinguish between the numbers, such as 26a, 26b, and 26c, they will be written as "42." When there is no need to distinguish between the numbers, such as 28a, 28b, and 28c, they will be written as "44."

[0026] A pump (M) is inserted in the raw material feed flow path 41 at an upstream position before the diluted dye is supplied. Also, a pump (M) is inserted in the dye addition flow path 42 at an upstream position before the dye is diluted. Furthermore, a pump (M) is also inserted in the dilution flow path 44. The operation of all pumps (M) is controlled by a control controller that is also used for cylinder press 1. In the control controller, the planned "color" is quantified according to the L*a*b* color system, and the discharge rates of pumps (M), (M), ... are determined according to a predetermined procedure so that colored paper colored in that "color" can be ultimately produced, and the dye dilution ratio, the blending ratio between dyes, and the total amount of dye added to the paper slurry are optimized.

[0027] In the colored paper manufacturing system having the above configuration, a color measurement unit 30 of the color monitoring system is incorporated in the flow path after the dye is added. 5, a portion downstream of the in-line mixer 27 of the raw material feed channel 41 is branched to provide a sample preparation branch channel 31. This branch channel 31 has a small channel size and a low flow rate. A compact version of the cylinder press 1 described above is connected to the branch flow path 31. A branch flow path 31 is connected to a header pipe 12 which is connected to a raw material supply port 11 of the cylinder press 1 . A take-out conveyor 32 is connected to the doctor 22 instead of the scraping device 23, and a recovery container 33 is provided at the downstream end of the take-out conveyor 32. A recovery container 34 is also provided at the drainage port 21.

[0028] In the cylinder press 1, the paper stock slurry to which the dye has been added is dehydrated and formed into a sheet, and the WET sheet S is placed on a take-out conveyor 32, which is a belt conveyor, and is taken out. The WET sheet S has a sufficient thickness that is uniform in the width direction.

[0029] In the colored paper manufacturing system, colored paper is manufactured by continuous paper making, so a certain amount of water must always be sent to the seed box, but the amount flowing into the branch flow path 31 is small, and even if there are some fluctuations in the discharge rate of the pump directly attached to the header pipe 12, there is no adverse effect on the progress of the entire continuous colored paper manufacturing process. Also, in the cylinder press 1, by slowing down the rotation speed of the dewatering drum 14, the transport speed of the WET sheet S on the take-out conveyor 32 can be slowed down to make it closer to a stationary state.

[0030] A colorimeter 35 is disposed above the take-out conveyor 32. This colorimeter 35 is connected to the control controller so as to be able to communicate with the control controller. The colorimeter 35 measures the spectral reflectance and outputs a numerical value according to the L*a*b* color system as color information. In the controller, the expected "color" is set within a range, and if the color information from the colorimeter 35 deviates from the center of the expected "color" numerically, as long as it is within the allowable range, the procedure for the discharge amounts of the pumps (M), (M), ... is changed in the direction that corrects the deviation without stopping the operation of the entire colored paper manufacturing system. In other words, the amount of dye supplied is automatically adjusted by feedback control. For example, if the color is shifting toward a stronger blue tone, the blending ratio of the blue dye is corrected to a lower value. The colorimeter 35 can measure the color of the WET sheet S when it is nearly stationary, so the measurement accuracy is high.

[0031] The colorimeter 35 is the online spectrophotometer JX7-100 manufactured by Color Techno System Co., Ltd. The light source is a halogen lamp. This device slides in the full width direction, but is characterized by being non-contact, and can be fixed by stopping the sliding. There is also a non-contact in-line spectrophotometer called "ColorXRA45" manufactured by X-Rite. This light source is an LED light source. This device is also fixed.

[0032] In wet paper color measurement, a solids concentration of around 30% is effective because the resolution (colorimetric degree) of b* (yellowish blue) is high, but there was no suitable device that could dehydrate the solids to a concentration of around 30% online. Therefore, attempts were made to measure the color with a slurry of around 4%, but perhaps because the color measurement accuracy and reliability were low, this method did not become very popular in the end, and on-site workers would conveniently squeeze the slurry by hand based on their experience, make balls of roughly 30% concentration, line them up, and visually observe the color change, and make adjustments based on the observations. Thus, in the present invention, on the dehydration side, by using a cylinder press 1, dehydration can be easily performed to a concentration of about 30%, and the cylinder press 1 itself can be made relatively simple and small. Also, on the color measurement side, a device has been developed that can measure the color of wet paper online without contact and has high resolution for any color in the L*a*b* color system, so this can be utilized. Moreover, since the online colorimeter is used on the cylinder press where no steam or the like is emitted, maintenance is also easy. As a result, a long-standing problem has been solved. In addition, in the conventional dye addition method, the dye was added in batches in the pulp stock chest (mixing chest), the color was mixed, and when the color matched, it was sent to the machine chest → seed box → paper machine. This required manpower and time, and the response time was long, but by utilizing an inline mixer, it became possible to perform inline color mixing by linking it with the dye input pump based on the dye mixing information (computer controlled).

[0033] Although the embodiment of the present invention has been described in detail above, the specific configuration is not limited to this embodiment, and the invention also includes design changes within the scope of the present invention without departing from the gist of the present invention. For example, the dyes are not limited to the three basic types, and these may be mixed to increase the number of colors such as "green." In this case, the number of dye addition flow paths 42 will increase accordingly, but it will be easier to fine-tune the color.

[0034] Furthermore, the colorimeter 35 and color system are not limited to those described above, and any system capable of acquiring color information may be used. Furthermore, the materials discharged from the color monitoring system are collected in collection containers 33 and 34, and if the materials collected in the collection containers 33 and 34 are remixed, they become the original colored raw material, and can also be returned to the main raw material stream.

[0035] Due to its structure, the cylinder press 1 is not limited to being used as part of a color monitoring system, and can be used in place of the concentrating and dehydrating machines described in Patent Documents 1 and 2. Recently, as it has become difficult to collect waste paper, there are more and more cases where large companies collect waste paper and turn it into paper slurry, rather than individual companies carrying out the entire process of collecting waste paper and recycling it into paper, and then small and medium-sized companies receive it and manufacture paper. However, the wet sheet S is easier to store and transport than the paper slurry. In particular, by arranging multiple raw material supply ports 11 in a well-balanced manner, the wet sheet S has a uniform thickness in the width direction, and is less likely to collapse when cut by a cutter and stacked on a pallet. For this reason, the cylinder press 1 is advantageous.

[0036] In the system of the above embodiment, a dye injection process is performed on the path from the machine chest to the seed box, which allows for quick response in color matching. After the dye addition process, a branch path for sample creation is provided on the route to the seed box, and the samples created along this branch path for sample creation are color-managed by a color management system, and color correction is performed as necessary by providing feedback. In the controller, the expected "color" is set within a range, and if the color information from the colorimeter 35 deviates from the center of the expected "color" numerically, as long as it is within the acceptable range, the procedure for the discharge amounts of pumps (M), (M), ... is changed in the direction that corrects the deviation without stopping the entire operation.Since the "color" is corrected within the expected range, the number of products that are treated as defective after papermaking is reduced.

[0037] However, when the range of the planned "color" is narrow, there may be cases where the color correction is slightly too late and the raw material is sent to the papermaking machine as is and paper is made. In such a case, the colored raw material that has gone through a series of color-matching processes from the dye-adding process to the stage where color correction is possible using the colorimeter 35 is not sent directly to the seed box, but is temporarily stored, and if the color is correct, it is sent directly to the seed box, and if the color is not correct, it is sent to a separate recovery route until it is correct, and then it is recovered in the recovery containers 33, 34 and returned to the main raw material stream. In this way, it is possible to take advantage of the quick response time for color adjustment while still being able to precisely reduce defective products, even when the desired "color" requirements are strict. [Explanation of symbols]

[0038] 1...Cylinder press 2...Base 3…Fixed base 4…Tilt base 5...Support shaft 6...Air spring 7...Raw material storage tank 8...Fixed tank 9...Tilt tank 10...Extendable part 11... Raw material supply port 12... Header pipe 13... Hose 14... Dehydration drum 15: drum side protruding portion 16: storage tank side protruding portion 17...Flat belt 18...Rubber sheet 18a...Free end 19...Mounting plate 20: Pressing plate 21: Drain hole 22...Doctor 23...Scraper 24…Raw material overflow port 25a, 25b, 25c, 41... Raw material feed channel 26a, 26b, 26c, 42...Dye addition flow channel 27…Inline mixer 28a, 28b, 28c, 44...Dilution flow path 29... In-line mixer 30... Color measurement section 31...Branch flow path 32...Removal conveyor 33...Collection container 34...Collection container 35...colorimeter L: Raw material F: Fiber content W: Moisture S...WET sheet M...Pump

Claims

1. A color management system comprising: a branched flow path for sample preparation branched off from a raw material feeding flow path that feeds colored paper raw material, to which dye has been adjustably added to a paper slurry, into a seed box; a sample preparation unit that is connected to the branched flow path for sample preparation and that prepares samples by dehydrating the colored paper raw material for sample preparation into a wet sheet; a color measurement unit that measures the color of the sample; and an adjustment means for adjusting the amount of dye supplied based on the color measured by the color measurement unit.

2. 2. The color management system according to claim 1, A color management system characterized in that the adjustment means adjusts the discharge volume of a pump inserted in a dye addition flow path connected to a raw material feed flow path based on the color measured by the color measurement unit.

3. 3. The color management system according to claim 2, A color management system in which a predetermined color is set within a range, and an adjustment means adjusts the pump discharge amount by automatic control so as to keep the color within the range.

4. 4. A color management system according to claim 1, The sample preparation department A raw material storage tank for storing raw materials for colored paper; A pair of dewatering drums are arranged in parallel in the raw material storage tank, and compress the raw material for colored paper that comes between them by periodic elastic contact and counter-rotation with each other, and send it upward; a raw material supply port provided in the raw material storage tank and communicating with a lower side of the dehydration drum; a cylinder press provided in the raw material storage tank and having a drainage port communicating with the inside of the dehydration drum; The color management system is characterized in that the raw material for colored paper is drawn toward one of the dehydration drums from between the pair of dehydration drums and comes out as a wet sheet.

5. 5. The color management system according to claim 4, The cylinder press is a rubber-like closing member that protrudes from the inner surface of the raw material storage tank toward the outer circumferential surfaces of a pair of dehydration drums in the shape of a sheet flap with the same height position, and whose tip abuts against the outer circumferential surfaces over the entire length direction to close a gap between the inner surface of the raw material storage tank and the outer circumferential surfaces of the dehydration drums, thereby separating the upper and lower portions; a raw material supply amount adjusting means for adjusting the amount of raw material supplied from the raw material supply port, a color management system for controlling the amount of raw material supplied by said raw material supply amount adjusting means in response to a contact state of the raw material with said rubber-like closing member;

6. 6. A color management system according to claim 5, The cylinder press is A color management system comprising a pair of dehydration drums, each of which has a raw material supply port provided below the other of the pair of dehydration drums at intervals in the axial direction of the dehydration drums.

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