KR100735656B1 - Apparatus and method of separating old corrugated containerboard into linerboard and corrugated medium by continuous pulping operation - Google Patents

Abstract

An apparatus and a method for separating linerboard from old corrugated cardboard are provided to improve the reusability of the old corrugated cardboard, by continuously separating corrugated medium and linerboard from the old corrugated cardboard. White water is continuously putted in a pulper by the amount of pulp, which is continuously discharged from the pulper to the outside, thereby uniformly keeping the amount of white water within the pulper(S1). Old corrugated cardboard is inputted and crushed to dissociate corrugated medium within the pulper(S2). Linerboard pieces are filtered out by flowing pulp contents containing the linerboard pieces into a screen, which is connected to an outlet of the pulper(S3). Contents unfiltered by the screen are returned to the pulper(S4). The associated corrugated medium is continuously discharged through a perforated plate, and sent to a single fiber corrugated medium chest(S6).

Description

Apparatus and method of separating old corrugated containerboard into linerboard and corrugated medium by continuous pulping operation}

1 is a process flow diagram schematically showing a lineage piece continuous separation method according to an embodiment of the present invention.

Figure 2 is a schematic diagram of a lineage piece continuous separation apparatus according to an embodiment of the present invention.

* Explanation of symbols for the main parts of the drawings *

1: White water tank 2: Pulper with perforated plate

3: white water regulating valve 4: water level measuring device

5: water level and paper concentration control device 6: perforated plate

7: Rota 8: Outlet

9: Pulper Motor 10: Screen (Rotating Screen)

11: Lineage piece conveying conveyor 12: Pulper refilling pump

13: lineage piece storage tank 14: core discharge pump

15: Central Heart Chest

The present invention relates to a method for separating and recycling waste cardboard into lineage and corrugated cardboard, and more particularly, to a method for continuous recycling of lineage that can significantly increase the recycling value of old corrugated containerboard.

In general, waste cardboard consists of corrugated core of short fiber and liner of long fiber, and is configured to safely store or distribute the contents from external impact. In particular, the percentage of long fiber contained in the liner of the cardboard is a factor that determines the economic value, the content of the cardboard depends on the performance. Therefore, in order to safely distribute the contents, the strength required for lineage should be ensured, and since the strength of the lineage is determined according to the ratio of long fibers, the effective treatment of long fibers in corrugated cardboard recycling process is very important. .

In general, linage paper contains more than 90% of unbleached kraft pulp, which is a long fiber, while the core core is a semifiber, semi-chemically treated hardwood.

The pulp (Semichemical H / W Pulp; SCP) is the main ingredient, and if recycled without separating it, the content of long fiber in the paper is lowered, which lowers the strength quality of the paper. On the other hand, liner used for corrugated cardboard can be obtained from natural pulp, but has been recycled for a long time in order to protect nature and reduce production costs. In particular, the conventional liner regeneration method has the following problems because the pulp is recycled only in a batch process without systematically distinguishing long-fiber liners and short-fiber liners.

First, when dissociating waste corrugated cardboard from pulp, high-quality unbleached kraft pulp (UKP) is mixed with lining paper, which is composed of short fibers, to inhibit the content of long fibers. Second, unbleached kraft pulp (UKP) of long fibers that could not be dissociated with impurities removed by various washing machines used to recycle waste cardboard is removed together, resulting in a decrease in the long fiber content that influences the quality of recycled kraft pulp. . Third, even when trying to remove the short fibers mixed in the paper using a classifier, there is a limitation in the existing classifier performance, once the short fibers mixed with unbleached kraft pulp (UKP) is not easily removed. Fourth, fibrill of unbleached kraft pulp (UKP) keratinized in the initial papermaking process in waste cardboard is dissociated or betrayed again in the regeneration process, and is separated from the body of unbleached kraft pulp (UKP) and becomes a fine fiber. Because of reducing the effective hydrogen binding area of the liver, the same strength as that of using natural unbleached kraft pulp (UKP) cannot be obtained.

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In particular, the existing classifier is classified by passing the recycled feed through the pressure screen (Pressure Screen) having a constant hole size, so that the long fibers and short fibers of the lining paper are tangled together. As long fibers are reversed along short fibers, separation of long fibers and short fibers by a screen is not easy.

 Therefore, in order to solve this problem, in the past, a plurality of classifiers were used in series, but it was difficult to obtain the ratio of long fibers required to increase the strength of the lineage to a certain level. Therefore, expensive natural unbleached kraft pulp had to be used to produce high strength lineage. Moreover, in order to remove impurities in the process of regenerating waste corrugated cardboard containing impurities, it is necessary to use a press screen such as Semang screen.Therefore, a large amount of unbleached kraft pulp (UKP) is used even when passing through the press screen. Since is mixed with impurities, the content of long fibers in the recycled stock is further reduced. In addition, the refiner, which is generally used to improve the recycle of recycled paper, removes the unbleached kraft pulp from the pulp body from the body of the pulp so that the effective hydrogen bond area between fibers is reduced. It is another factor that impairs tensile strength because it reduces.

As another method for solving the conventional problem, a manual dual batch method is disclosed in US Pat. No. 6,340,407.

However, in this manual double batch method, the dissociation-pulper is determined by the operator's visual observation of the dissociation of the core, and after discharging the manual dissipation of the core, the linger remains in the pulp. Disintegrate by adding white water and lineage dissociation accelerator, and discharge the disintegrated lineage stock. Therefore, the operator must always observe the inside of the dissociation-pulper. When dissociating waste cardboard in large quantities using very large pulpers, it is not only difficult for an operator to observe the inside of the pulp accurately but also depends on the subjective judgment of the operator. There was a problem that the content ratio of.

In addition, the dual arrangement method uses the property that the core core dissociates before the liner. That is, when the core core dissociates, the core core material in the pulper is discharged out of the pulp through the porous plate of the pulper and sent to the short fiber chest, and white water is added again to dissociate the remaining lineage pieces that are not yet dissociated in the pulp. The disintegrated liner paper is dissociated, and then the liner paper is discharged through the same porous plate and sent to the long fiber chest to separate the liner paper and the corrugated paper.

However, the above-described dual arrangement method cannot use the existing pulping system as it is, and the whole system modification and change are necessarily accompanied. Thus, apart from the efficiency of the dual batch, there are considerable practical implications for the existing lineage regeneration pulping system due to the different cost and lengthening of the retrofit time for the dual batch application.

The present invention devised to solve the above problems, by using the waste cardboard to separate the corrugated medium and liner continuously used to provide a lineage recovery method that can increase the recycling value of the waste cardboard and also increase the separation efficiency. have.

In order to achieve the above object, the present invention, in the method for continuously separating the lineage pieces from the waste cardboard, continuously feeding the white water as much as the paper material continuously discharged from the pulper to maintain a constant amount of white water in the pulper A first step of discharging the corrugated cardboard at the same time by pulverizing the waste cardboard while operating the pulper rota at a constant speed; A second step of filtering the pulp contents containing the pieces of lineage to a screen connected to an outlet of a specific portion to filter out pieces of lineage; Sending a passed content back to the pulp without being filtered out of the screen; And a fourth step through which a predetermined amount of dissociated bone core material is continuously discharged to the short fiber core core chest through the porous plate of the pulper.

The present invention also provides a method for continuously separating lineage pieces from waste cardboard, comprising: a first step of dissociating bone cores from waste cardboard and forming lineage pieces while replenishing the pulp with white water corresponding to the discharged amount; A second step of sorting the lineage pieces by discharging the lineage pieces and feedstock with continuous white water input into a pulp; And a third step of discharging the corrugated paper stock in the pulp with continuous input of white water into the pulp.

Hereinafter, a lineage reproducing apparatus and method according to the present invention will be described in detail with reference to the accompanying drawings.

First, referring to Figure 1 will be described in detail the lineage separation method according to an embodiment of the present invention as follows.

Unlike the conventional lineage regeneration process that is discontinuous by separating the process of dissociating dissociated bone cores and the process of discharging lineage pieces, in the present invention, the lineage pieces generated in the process of dissociating waste cardboard are dismantled. It can be characterized by continuous discharge through a specific outlet.

In the present invention, when the waste corrugated cardboard is put in the state driving the rotator of the pulper, the corrugated cardboard is gradually broken into small pieces, and the corrugated core is first dissolved in the water, and the crushed lineage pieces are present in a non-relative state. At this time, if the contents of the pulp are continuously put into the screen connected to the discharge port through a specially designed discharge port in the pulp, the untreated pieces of lineage are filtered continuously. In other words, the non-crushed lineage pieces cannot pass through the perforated plate in the pulper, so if the contents of a certain volume are continuously discharged out of the pulper, only the corrugated paper is continuously discharged. Therefore, this system proposes a method to separate the corrugated core and ligne at the same time while continuously operating the pulper. Referring to this in more detail through the process flow diagram of Figure 1 as follows.

First, while maintaining the water level in the pulper continuously put the waste cardboard (S1). At this time, while keeping the water level of the pulper continuously discharge the corrugated wick and lineage pieces, white water and corrugated cardboard as much as discharged is continuously put into the pulper, the white water and the corrugated cardboard that is present in the pulper as a whole The amount of is controlled constantly. The amount of white water may be easily implemented by measuring the amount of waste cardboard input and the concentration of dissociated bone wick.

While continuously operating the rota of the pulper to disintegrate the corrugated cardboard to dissociate the core (S2), the speed of the rota is not a problem if it is adjusted to be made in the normal speed range of the normal pulping.

The lineage pieces that have not yet been dissociated after dissociation of the core core are sent to the screen through an outlet formed at a specific position in the pulper, so that the remaining lineages are not separated (S3). In addition, the corrugated paper material discharged to the screen together with the lineage paper is sent back to the pulp after passing through the screen (S4). On the other hand, the outlet should be selected in an appropriate position to increase the discharge efficiency of the lineage pieces, generally, if the lineage characteristics are used to some extent floating in the pulp, the outlet to the floating position of the lineage Naturally, it should be installed in the corresponding place. In a preferred embodiment, the outlet may be installed at the bottom and the center of the pulp. However, the location of the outlet may be slightly different depending on the size and shape of the pulp, but if you select the area where the lineage pieces are located most, there will be no big problem. In addition, the shape of the inlet of the outlet should also be considered so that the lineage piece does not block the inlet of the outlet. In general, the lineage has a size of about 1 to 8 cm without being dissociated. It would be desirable to limit to 8 cm.

Subsequently, the ligne pieces filtered through the screen are subjected to a separate transfer process, dried and compressed or packed, or transferred to another pulper to undergo a separate dissociation process (S5).

On the other hand, through the porous plate of the pulper is dissociated corrugated material is continuously discharged and sent to the short-fiber corrugated chest (S6).

The ligage sorting method according to the present invention can minimize the modification and change in the existing pulper structure by selectively separating only the unfilled ligna in the continuous pulping process, and also by not using a double batch as a whole system Simplify the operation.

Figure 2 is a schematic diagram of a system for continuously separating the core core and lineage pieces at the same time using a system in which a pulper with a perforated plate and a screen are integrally attached according to an embodiment of the present invention.

When the waste corrugated cardboard is put into the pulper 2 together with the white water from the white water tank 1 while driving the rota 7, the corrugated cardboard is gradually broken into small pieces within 5 minutes, and the corrugated medium is dissolved in water. It is dissociated, and lineage paper is present in small pieces of about 1 to 8 cm in the undissociated state. At this time, if the contents of the pulper 2 are continuously put into the screen 10 (normally, a rotating drum screen, a vibration screen, or a fixed screen) through a specially designed outlet 8 in the pulper 2, the untreated ligage piece This is filtered continuously. Here, the hole size of the inlet 8 for filtering liner paper is designed to be about 8 cm in diameter so that the liner paper passes through the liner piece and not yet crushed. While not passing through the inlet, small pieces of lineage paper can be easily passed through the outlet 8.

Lineage is screened from the stock sent to the screen 10 and the residue is sent back to the pulper 2 via a pulper re-entry pump 12. In a preferred embodiment, the screen 10 may be implemented as a rotating drum screen so that the paper may be supplied into the drum to sort the lineage. In addition, the screen 10 may be formed as a vibration screen or a fixed dummy screen vibrated by the vibration motor.

Meanwhile, the water level and the paper concentration control device 5 programmed to optimize the operation of the pulper 2 are considered in consideration of factors such as the water level in the pulp, the paper concentration, the amount of corrugated paper input, and the time of input. By operating the corrugated medium discharge pump 14 through the perforated plate 6 to continuously discharge the contents of the material of a constant capacity out of the pulper (2) will be continuously discharged corrugated paper. At this time, the hole size of the porous plate 6 is designed as a small hole that can not pass through the liner pieces. In addition, the water level and the stock concentration adjusting device 5 controls the white water control valve 3 by measuring the white water level in the pulp 2 through the water level measuring device 4 and measuring the concentration of the white water. Will be adjusted. Of course, it will be apparent to those skilled in the art that the amount of white paper to be added is also taken into account in consideration. In FIG. 2, reference numeral 7 denotes a rotor, 9 a pulper motor, 11 a liner piece conveying conveyor, 13 a liner piece storage tank, and 15 a core core material chest.

In addition, in the preferred pulping system of the present invention, one or more outlets 8 may be formed to effectively discharge the remaining lineage pieces that have not yet been dissociated in the pulp 2.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, modifications, and alterations are possible within the scope without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

The present invention described above can keep the load on the pulper constant by operating the pulper in a continuous manner, thereby increasing the stability and durability of the mechanical device, and simplifying the operating conditions. It can provide many advantages.

In addition, the present invention described above allows to separate the waste corrugated cardboard into lineage pieces and corrugated paper by continuous system operation rather than the double batch method compared to the conventional separation and dissociation system, and on the other hand, the existing factory allows the production line It is possible to greatly reduce the material cost by using the lineage scrap as a raw material that can replace expensive natural pulp without remodeling, thereby greatly increasing the recycling value of waste cardboard.

Claims (11)

In the method of continuously separating the lineage pieces from the waste cardboard, The first step is to continuously input the amount of white water discharged from the pulper to the outside continuously to maintain the amount of white water in the pulper, and to put the pulverized cardboard by pulverizing the pulper rotatable at a constant speed and to dissociate the core at the same time. ; A second step of filtering the pulp contents containing the pieces of lineage to a screen connected to an outlet of a specific portion to filter out pieces of lineage; Sending a passed content back to the pulp without being filtered out of the screen; And The fourth step through the perforated plate of the pulper is discharged a certain amount of dissociated corrugated material continuously and sent to the short-fiber corrugated chest Lineage piece separation method comprising a.  The method of claim 1, The first step is, The method of separating the lineage pieces comprising the step of supplying the white water and waste cardboard as much as the flow rate containing the corrugated paper material discharged to the short fiber corrugated medium chest through the porous plate to constantly fix the water level in the pulp.  The method of claim 1, The screen is a drum type rotary drum screen rotatably formed lineage piece separation method characterized in that the non-replaced ligage piece from the pulper is supplied into the rotating drum screen.  The method of claim 1, The screen is a vibrating screen vibrating by a vibration motor, the lineage fragment separation method characterized in that the contents containing the liner pieces compared to the pulp is supplied to the upper portion of the vibrating screen through the outlet. The method of claim 1, The screen is a fixed dummy screen without any movement, the contents of the liner pieces separated from the pulper is supplied to the top of the dummy screen through the discharge port, characterized in that the lineage piece separation method.  The method of claim 1, The method, And re-sending the contents passing through the screen to the pulp after the lineage pieces are filtered.  The method of claim 1 The outlet is formed in the bottom and the middle portion of the pulper to match the floating characteristics of the lineage pieces, lineage pieces separation method.  The method of claim 1, The amount of white water in the first step is adjusted by measuring the white water level and concentration in the pulp. In the method of continuously separating the lineage pieces from the corrugated cardboard, A first step of sensing the amount of white water discharged through the water level and the paper concentration control device, replenishing the corresponding white water in the pulp, dissociating the core core from the corrugated cardboard and forming the lineage pieces; To the white water with a continuous input into the pulper discharges the license born operation and supply a second step of selecting a piece of the license born; And A third step of discharging the core wick in the pulp with the continuous addition of the white water into the pulp; Lineage piece separation method comprising a.  The method of claim 9, The method, Re-sending the residue after sorting the lineage pieces to the pulp.  The method of claim 9, The method, And measuring the white water level and concentration in the pulp to control the white water amount.

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