JP2010059586A - Method for recycling and utilizing used paper diaper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for recycling and utilizing a used paper diaper by which a polymer contained in the paper diaper can be converted into a fine particulate state without using an agent. <P>SOLUTION: The method for recycling and utilizing includes breaking the used paper diaper; simultaneously disassembling the paper diaper into a pulp component and a non-pulp component; washing the resultant mixture of the disassembled pulp component and non-pulp component such as a vinyl resin with water; then separating and recovering the non-pulp component from the mixture; breaking the polymer mixed in the pulp component removed from the non-pulp component, and absorbing water and swelling into the fine particulate state of ≤10 μm without breaking fibers of the pulp component with a pulverizer 1; forming a suspension containing the fine particulate polymer, pulp component and water; dewatering the suspension; removing the polymer together with the water from the pulp component; and recovering the pulp component. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a recycling method for used paper diapers for recovering and reusing pulp components from used paper diapers.

  Patent Documents 1 and 2 disclose a recycling method in which after a used paper diaper is broken, a polymer polymer contained in the paper diaper is decomposed into granular monomers with water mixed with a polymer decomposing agent, and then a pulp component is separated and recovered. Is disclosed.

JP 2000-084533 A (Fig. 1-2) JP 2006-289154 A (FIG. 2)

  In the recycling methods of Patent Documents 1 and 2, since a polymer polymer is decomposed using a polymer decomposing agent (medicine), storage of the polymer decomposing agent and adjustment of the mixing ratio of the polymer decomposing agent to water, etc. Management becomes troublesome.

  The present invention has been made to solve the above-described problems. The polymer polymer contained in the paper diaper is made into fine particles without using a chemical, and the polymer polymer can be easily mixed with water from the pulp component. It aims at providing the recycling method of the used paper diaper which can be removed.

  As shown in FIG. 1, the used paper diaper recycling method according to the present invention breaks a used paper diaper and decomposes it into a pulp component and a non-pulp component, and a mixture of the decomposed pulp component and the non-pulp component. After washing with water, the non-pulp component is separated and recovered from the mixture, and the pulp component is mixed with the pulp component from which the non-pulp component has been removed without breaking the fiber of the pulp component. Breaking the water-absorbing high-molecular polymer into fine particles of 10 μm or less to form a suspension containing the fine-particle high-molecular polymer, the pulp component and water, and dehydrating the suspension to obtain the pulp component The high-molecular polymer is removed together with water to recover the pulp component. Here, the non-pulp component corresponds to a synthetic resin such as vinyl, which is a constituent material of a paper diaper, and a non-woven fabric made of a synthetic resin. The washing water includes industrial water and seawater made up of ground water, river water, and the like. The smaller the diameter of the polymer polymer fine particles after breaking, the better.

  Specifically, the pulverizer 1 includes a rotating body 2 formed in a disk shape and driven to rotate by a motor 6, a fixed body 3 formed in a disk shape, and the rotating body 2 and the fixed body 3 accommodated therein. Casing 7. The fixed body 3 is fixed to the casing 7 and has fixed tooth rows 16 and 17 in which a plurality of fixed teeth 15 are arranged at predetermined intervals along the circumferential direction of the fixed body 3. The rotating body 2 has rotating tooth rows 20 and 21 in which a plurality of rotating teeth 19 are arranged at predetermined intervals along the circumferential direction of the rotating body 2, and the rotating tooth rows 20 and 21 are arranged. It arrange | positions so that a surface may become coaxial with the fixed body 3 with the attitude | position which faces the surface which has arrange | positioned the fixed tooth row | line | column 16 * 17 in the fixed body 3. FIG. The rotating tooth rows 20 and 21 of the rotating body 2 and the fixed tooth rows 16 and 17 of the fixed body 3 are alternately arranged in the radial direction of the fixed body 3 with a gap W having a predetermined dimension interposed therebetween. The pulp component and the high molecular polymer flow from the axial center side of the rotating body 2 and the fixed body 3 toward the peripheral side, so that the rotating tooth rows 20 and 21 of the rotating body 2 and the fixed tooth rows 16 and 17 and pass through. The gap W between the rotary teeth 20 and 21 and the fixed teeth 16 and 17 is such that the pulp component fibers are the rotation teeth 19 of the rotary teeth 20 and 21 and the fixed teeth 15 of the fixed teeth 16 and 17. It can be set to the dimension which can avoid breaking by. The gap W between the rotating dentitions 20 and 21 and the fixed dentitions 16 and 17 is preferably large. However, if the gap W is excessively large, the polymer polymer is difficult to break, so the range of 0.2 to 0.8 mm is used. preferable.

  At least a part of the polymer polymer that has passed through the rotating teeth 20 and 21 of the rotating body 2 and the fixed teeth 16 and 17 of the fixed body 3 is returned to the axial center side of the rotating body 2 and the fixed body 3. can do.

  The pulp component washed with water and the non-pulp component can be washed again with water.

  According to the recycling method of used paper diapers according to the present invention, the water-swelling high-molecular polymer is broken down to fine particles of 10 μm or less that can be suspended by the pulverizer 1, so that it can be dehydrated from the pulp component. The high molecular weight polymer can be easily removed together with water, so that only the pulp component can be reliably recovered. In addition, since the high molecular polymer is made into fine particles without using the drug, management such as storage of the drug becomes unnecessary, and it is possible to reduce the management effort associated with the implementation of the recycling method. Moreover, since the pulverizer 1 does not break the fibers of the pulp component, it can be prevented that the fiber length of the pulp component becomes excessively short and the pulp component cannot be reused for corrugated cardboard or the like. Further, since the non-pulp component is recovered, the non-pulp component can be reused as a recycled resin or the like.

  The gap W between the rotary teeth 20 and 21 of the rotary body 2 of the crusher 1 and the fixed teeth 16 and 17 of the fixed body 3 is such that the fibers of the pulp component are in contact with the rotary teeth 19 of the rotary teeth 20 and 21. If the dimension is set so as to avoid breaking with the fixed teeth 15 of the fixed tooth rows 16 and 17, the polymer polymer that absorbs water and collides with the rotating teeth 19 of the rotating body 2 that rotates. Thus, it is possible to reliably prevent the fibers of the pulp component from being broken by the pulverizer 1 while being surely broken to be fine particles.

  When the polymer polymer that has passed through the rotating teeth 20 and 21 of the rotating body 2 and the fixed teeth 16 and 17 of the fixed body 3 is returned to the axial center side of the rotating body 2 and the fixed body 3, the polymer polymer Collides with the rotating tooth 19 again, and the high molecular polymer is further broken to promote fine particles.

  When the pulp component washed with water and the non-pulp component are washed again with water, the waste component and dirt are more reliably removed from the pulp component and the non-pulp component. Can improve the quality.

  1 to 3 show an embodiment of a method for recycling used diapers according to the present invention. In this recycling method, as shown in FIG. 1, a metering step, a decomposition step, a washing step, a rewashing step, a separation step, a pulp component / high polymer mixture grinding step, a dehydration step, and a recovery step The pulp component contained in the used paper diaper is recovered through these steps in order. Further, this recycling method has a vinyl recovery step of recovering non-pulp components such as synthetic resin such as vinyl and nonwoven fabric made of synthetic resin contained in the used paper diaper.

  In the weighing step, the used paper diapers to be processed are weighed and gathered into a predetermined amount and broken into pieces by a cutter or the like. In the metering process, used paper diapers are sterilized and deodorized using an ultraviolet lamp, ozone (gas), ozone water, or the like. In the following steps, the used paper diaper is processed every predetermined amount.

  In the decomposition step, the used paper diaper, which is bundled into the predetermined amount and broken, is put into a decomposition drum into which industrial water, seawater, or the like is poured, thereby absorbing water and blowing it. The used paper diaper is decomposed into a pulp component containing a polymer and a waste component and a non-pulp component by rotation of a decomposition drum. Further, the high molecular polymer is swollen with water.

  The decomposition drum is provided with a large number of holes having a diameter of 3 mm so that only water-soluble filth components and dirt pass through the holes together with the groundwater and seawater. Pulp components and non-pulp components remaining in the cracking drum are sent to the washing step. The industrial water containing the water-soluble filth component is purified by using microorganisms and then discharged to the sewer. A plurality of protrusions are provided on the inner surface of the disassembling drum, and the disintegration is promoted by the protrusions colliding with a used paper diaper in a broken state as the disassembling drum rotates. In addition, in the pulp component and non-pulp component sent to the washing | cleaning process, a filth component, dirt, etc. still remain.

  In the washing step, the mixture of the pulp component and the non-pulp component taken out from the decomposition drum is put into a washing drum disposed in a washing tank into which industrial water or the like is poured, and the washing drum Is cleaned by rotating for a predetermined time. The cleaning drum is provided with a large number of holes having a diameter of 8 mm, and the cleaning action is promoted by stirring the mixture as it passes through the holes. By this washing, filth components and dirt are separated from the pulp components and non-pulp components. During cleaning, industrial water or the like in the cleaning tank is not drained, and when cleaning is completed, it is sent to the re-cleaning step together with the mixture. Thereafter, industrial water or the like is newly poured into the washing tank.

  In the re-cleaning step, the mixture and industrial water sent from the cleaning tank are put into a re-cleaning drum from which industrial water is discharged, and the re-cleaning drum rotates for a predetermined time. The mixture is again washed (rewashed) with water. The re-cleaning drum is provided with a large number of holes having a diameter of 3 mm, and only water-soluble filth components and dirt pass through the holes together with industrial water and the like. The water discharge into the re-cleaning drum is continuously performed during the re-cleaning. Along with this, the filth component and dirt removed from the pulp component and the non-pulp component pass through the hole of the rewash drum together with industrial water and the like and are removed from the rewash drum. As a result, the waste components and dirt are almost completely removed from the pulp components and the non-pulp components. After completion of rewashing, the mixture of pulp and non-pulp components remaining in the rewash drum is sent to the separation step. The industrial water containing the water-soluble filth component is purified by using microorganisms and then discharged to the sewer. The pulp component and the non-pulp component are sent to the separation step in a state containing water.

  In the separation step, the pulp component and the non-pulp component containing water are put into a separation drum provided with a large number of holes having a diameter of 8 mm, so that the pulp component and the polymer polymer together with water are formed in the separation drum. While passing through, non-pulp components remain in the separation drum. Non-pulp components such as vinyl remaining in the separation drum are recovered in the vinyl recovery step and reused as recycled resin or the like. The pulp component and the polymer polymer that have passed through the holes of the separation drum are temporarily stored together with water in a storage tank.

  In the pulp component / high polymer mixture pulverizing step, the polymer and the pulp component stored in the storage tank are sent to the pulverizer 1 together with water. Then, the pulverizer 1 does not break the fibers of the pulp component, but breaks the polymer polymer mixed with the pulp component from which the non-pulp component has been removed and water-absorbed into fine particles of 10 μm or less, As a result, a suspension containing the particulate polymer, the pulp component, and water is formed.

  In the dehydration step, the suspension is put into a dewatering drum and dehydrated by rotating the dewatering drum. The dewatering drum is provided with a large number of holes having a diameter of 3 mm, and the polymer polymer mixed with water passes through the holes together with the water and is removed from the pulp component. Water and polymer are drained into sewers and the like, but the polymer is harmless and does not adversely affect the environment. Further, since the high molecular polymer is broken into fine particles, it does not cause clogging of sewers or the like.

  In the recovery step, the pulp component is taken out from the dewatering drum. Then, the recovered pulp component is processed into cardboard or the like and reused.

  As shown in FIGS. 2 and 3, the pulverizer 1 used in the pulp component / high polymer mixture pulverization step includes a rotating body 2 formed in a disk shape, a fixed body 3 formed in a disk shape, And a casing 7 for housing the rotating body 2 and the fixed body 3. The rotating body 2 is connected to a motor 6 through a shaft 5 and is driven to rotate by the motor 6. The rotating body 2 rotates at a high speed, for example, at a rotational speed of 2000 to 2500 rpm.

  As shown in FIG. 2, the upper wall 7 a of the casing 7 is formed with an introduction port 10 for introducing the polymer and the pulp component sent together with water from the storage tank. 7b is formed with a discharge port 11 for discharging the polymer polymer broken by the pulverizer 1 and the pulp component. A packing 12 is disposed between the peripheral edge of the rotating body 2 and the inner surface of the side wall 7 b of the casing 7. The packing 12 is not completely sealed between the periphery of the rotating body 2 and the inner surface of the side wall 7b of the casing 7, and at least a part of the broken polymer returns to the inlet 10 side. It is to be broken again. This facilitates the formation of fine polymer polymer particles. The packing 12 does not hinder the rotation of the rotating body 2.

  The fixed body 3 of the pulverizer 1 is fixed to the lower wall 7c of the casing 7 with bolts or the like. As shown in FIGS. 2 and 3, the fixed body 3 has an upper surface in the circumferential direction of the fixed body 3. A plurality of fixed teeth 15 are arranged along the inner and outer fixed teeth rows 16 and 17 along a predetermined interval. On the lower surface of the rotating body 2, there are inner and outer two rotating tooth rows 20 and 21 in which a plurality of rotating teeth 19 are arranged at predetermined intervals along the circumferential direction of the rotating body 2. The rotating body 2 and the fixed body 3 are coaxial with the fixed body 3 so that the surface on which the rotating tooth rows 20 and 21 are disposed faces the surface on which the fixed tooth rows 16 and 17 are disposed on the fixed body 3. It is arranged up and down.

  The fixed teeth 15 are formed in a flat plate shape having a radial thickness smaller than the dimensions of the fixed body 3 in the circumferential direction and the vertical direction, and the rotating teeth 19 have dimensions in the circumferential direction and the vertical direction of the rotating body 2. It is formed in a flat plate shape having a smaller thickness dimension in the radial direction.

  The rotating body 2 is formed with four openings 22 at a predetermined interval in the circumferential direction on the axial center side relative to the rotating teeth 20 and 21, and the hood 23 covers the upper surface of each opening 22. Is provided. The hood 23 is disposed in the upper portion of the casing 7 and opens toward the downstream side in the rotation direction A (FIG. 3) of the rotating body 2, and the round roof-shaped upper surface 23 a of the hood 23 extends from the upper surface of the opening 22. The rotating body 2 is inclined upward toward the downstream side in the rotation direction. The lower surface of the opening 22 of the rotating body 2 is connected to an annular annular groove 25 formed on the lower surface of the rotating body 2, and the outer peripheral wall 26 of the annular groove 25 extends to the outer peripheral side of the rotating body 2. A communication groove 27 is formed.

  The rotating tooth rows 20 and 21 of the rotating body 2 and the fixed tooth rows 16 and 17 of the fixed body 3 are alternately arranged in the radial direction of the fixed body 3 with a gap W having a predetermined dimension (for example, 0.25 mm) interposed therebetween. Be placed. That is, the rotating tooth row 20 on the inner peripheral side of the rotating body 2 enters the fixed tooth rows 16 and 17 in the inner and outer two rows of the fixed body 3 with the gap W interposed therebetween. The rotating tooth row 21 on the outer peripheral side of the rotating body 2 is positioned in a state where the gap W is interposed outside the fixed tooth row 17 on the outer peripheral side of the fixing body 3. The fixed tooth row 16 on the inner peripheral side of the fixed body 3 is positioned in a state where a gap W0 having a predetermined dimension (for example, 0.25 mm) is interposed outside the outer peripheral wall 26 of the rotating body 2.

  The gap W between the rotating tooth rows 20 and 21 and the fixed tooth rows 16 and 17 is such that the pulp component fibers are between the rotating teeth 19 of the rotating tooth rows 20 and 21 and the fixed teeth 15 of the fixed tooth rows 16 and 17. The dimensions are set so as to avoid breaking. In addition, the clearance gap between the lower end surface of the rotation tooth row | line 20 * 21 of the rotary body 2 and the upper surface of the fixed body 3 which faces it, and the upper end surface of the fixed tooth row | line | column 16 * 17 of the fixed body 3, and the rotary body 2 which faces it. The gap between the lower surface and the lower surface is preferably narrow.

  Then, the polymer and the pulp component sent together with water from the storage tank are introduced into the upper portion of the casing 7 from the introduction port 10 and taken into the hood 23 of the rotating body 2. It flows from the axial center side of the rotating body 2 and the fixed body 3 toward the peripheral side through the opening 22, the annular groove 25, and the communication groove 27 in order. As a result, the water-swelling high molecular polymer passes through the rotating teeth 20 and 21 of the rotating body 2 and the fixed teeth 16 and 17 of the fixing body 3 and is broken into fine particles of 10 μm or less. . Note that at least a part of the broken polymer returns to the inlet 10 side as described above.

  When the fibers of the pulp component pass through the fixed teeth 16 and 17 and the rotating teeth 20 and 21, the pulp teeth of the fixed teeth 16 and 17 and the rotating teeth 19 of the rotating teeth 20 and 21 cause pulp component Since the fiber is prevented from being broken, the fiber length of the pulp component is prevented from becoming excessively short and cannot be reused for corrugated cardboard or the like.

  In this way, the polymer polymer that has absorbed and expanded water is broken to 10 μm or less that can be suspended by the pulverizer 1, so that the polymer can be easily separated from the pulp component together with water by the dehydration process in the dehydration step. Can be separated. Thus, only the pulp component can be reliably recovered. Further, in the recycling method of the present invention, since no drug is used in any step, the trouble of managing the drug becomes unnecessary.

  A filter may be disposed between the storage tank and the pulverizer 1. In the measuring step, the used paper diaper may be heated and sterilized using a microwave or the like. Each of the rotating tooth rows 20 and 21 and the fixed tooth rows 16 and 17 may be only one row, or three or more rows.

It is a process diagram of the recycling method of used paper diapers according to the present invention. It is a longitudinal section showing the important section of the crusher concerning the present invention. It is a cross section which shows the principal part of a grinder.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Crusher 2 Rotating body 3 Fixed body 6 Motor 7 Casing 15 Fixed tooth 19 Rotating tooth 20/21 Rotating tooth row 16/17 Fixed tooth row

Claims (4)

  The used paper diaper is broken and decomposed into a pulp component and a non-pulp component. After the mixture of the decomposed pulp component and the non-pulp component is washed with water, the non-pulp component is separated and recovered from the mixture. By using the pulverizer (1), the high-molecular polymer that is mixed with the pulp component from which the non-pulp component has been removed and is swollen with water is broken into fine particles of 10 μm or less without breaking the fibers of the pulp component. Forming a suspension containing a fine polymer polymer, a pulp component and water, dehydrating the suspension, removing the polymer from the pulp component together with water, and recovering the pulp component. Recycled used disposable diapers. The pulverizer (1) includes a rotating body (2) formed in a disk shape and driven to rotate by a motor (6), a fixed body (3) formed in a disk shape, a rotating body (2), A casing (7) for accommodating the stationary body (3),
The fixed body (3) is fixed to the casing (7), and a plurality of fixed teeth (15) are arranged at predetermined intervals along the circumferential direction of the fixed body (3). 17) at least one row,
The rotating body (2) has at least one rotating tooth row (20, 21) in which a plurality of rotating teeth (19) are arranged at predetermined intervals along the circumferential direction of the rotating body (2). It arrange | positions so that the surface which has arrange | positioned this rotation tooth row | line | column (20 * 21) may be coaxial with a fixed body (3) in the attitude | position which faces the surface which has fixed tooth row | line | column (16 * 17) in a fixed body (3). And
The rotating tooth row (20, 21) of the rotating body (2) and the fixed tooth row (16, 17) of the fixing body (3) are fixed body (3) with a gap (W) of a predetermined dimension interposed therebetween. ) Alternately arranged in the radial direction,
The pulp component and the high molecular polymer flow from the axial center side to the peripheral side of the rotating body (2) and the stationary body (3), thereby fixing the rotating tooth row (20, 21) of the rotating body (2). Pass through the fixed dentition (16, 17) of the body (3),
The gap (W) between the rotating dentition (20 · 21) and the fixed dentition (16 · 17) is such that the fibers of the pulp component are the rotation teeth (19) and the fixed teeth of the rotating dentition (20 · 21). The method of recycling used diapers according to claim 1, wherein the used disposable diapers are set to dimensions that can avoid breaking with the fixed teeth (15) of the rows (16, 17).   At least part of the polymer polymer that has passed through the rotating dentition (20/21) of the rotating body (2) and the fixed dentition (16/17) of the fixing body (3) is the rotating body (2) and the fixing body The recycling method for used paper diapers according to claim 2, which is returned to the axial center side of (3).   The recycling method of the used paper diaper according to any one of claims 1 to 3, wherein the pulp component washed with water and the non-pulp component are washed again with water.

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