JP2009119456A - System and method for by-type collection of plastic and paper from plastic wall paper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a by-type collection system enabling reliable by-type collection of plastic chips and paper from cut pieces of plastic wall paper with no adhesion of paper to the plastic chips or interminglement of plastic in paper. <P>SOLUTION: The system is for a by-type collection method comprising dispersing cut pieces of plastic wall paper in an aqueous solution of a cellulase(s), stirring the resultant mixture to separate the substrate from the resin layer of the cut pieces and collecting paper and plastic chips by type. It includes a separation tank 10, a stirrer 20, a filtering machine 30, a plastic dispersion storage tank 50, a plastic collection net 60, a first pump 41 circulating the aqueous solution of the enzyme flowing out of the filtering machine 30 to the separation chamber 10A of the separation tank 10 and a second pump 42 circulating the aqueous solution of the enzyme discharged from the plastic dispersion storage tank 50 to the separation chamber 10A of the separation tank 10. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a system for separating and collecting plastic and paper from plastic wallpaper, and more particularly, to a method for separating and collecting plastic paper, more specifically, from a cut piece of plastic wallpaper in which a resin layer is formed on a substrate made of paper. The present invention relates to a system and method for separating and recovering plastic pieces and paper derived from a substrate.

Plastic wallpaper in which a resin layer is formed on a paper substrate is manufactured and used in large quantities as an interior material.
In the manufacturing process and use (at the time of new construction or replacement) of these plastic wallpaper, a large amount of scrap or waste material of the plastic wallpaper is discarded as industrial waste.

  Such plastic wallpaper has a base material and a resin layer that are firmly adhered to each other and cannot be easily peeled off. Paper and plastic are separately collected and recycled from the above scraps or waste materials (resource reuse). It was virtually impossible to do.

  Here, the resin layer of the plastic wallpaper is composed of soft polyvinyl chloride resin (PVC), ethylene-vinyl acetate copolymer resin (EVA), ethylene-methyl methacrylate resin (EMMA), ethylene-ethyl acrylate resin (EEA), It is composed of ethylene-methyl acrylate resin (EMA) or the like, and among these, soft polyvinyl chloride accounts for about 90%.

  Also, foam (foamed resin) is frequently used for the resin layer of plastic wallpaper. A plastic wallpaper having a resin layer made of a foam is lightweight, has a good texture, and is excellent in soundproofing. Here, in order to form a resin layer made of a foam, an organic pyrolytic foaming agent such as azodicarbonamide (ADCA) or 4,4'-oxybisbenzenesulfonyl hydrazide (OBSH) is used.

  At present, these products are hardly recycled (resource reuse), and most of them are incinerated or disposed as landfills as industrial waste.

  In the case of incinerating plastic wallpaper with a resin layer made of vinyl chloride resin, the problem of dioxin that has been attributed to vinyl chloride resin is becoming less of a problem due to recent improvements in incinerator technology. There is concern about the effect of acidic components (hydrochloric acid) on the incinerator caused by hydrogen chloride generated in

In addition, when the scrap or waste material of a plastic wallpaper having a resin layer made of foam is disposed of in landfill, the bulk specific gravity is small and the landfill efficiency is extremely poor.
And among the scraps or scraps of plastic wallpaper to be disposed of in landfill, the paper that made up the base material is decomposed over time with enzymes contained in the soil, but the plastic that made up the resin layer It is preserved in the soil for many years.

  The disposal of plastic wallpaper described above is not an appropriate disposal method from the viewpoint of the global environment. Furthermore, the amount of these wallpaper to be discarded in the future is increasing, and an appropriate response is desired.

(1) Conventionally, a method has been attempted in which a scrap or waste material of plastic wallpaper is pulverized by mechanical means and the plastic and paper are separated by a difference in specific gravity.

  However, according to such a method, it is impossible to completely separate and collect plastic and paper. Paper remains in the collected plastic, and plastic remains in the collected paper.

When the plastic recovered by such a method is reused (for example, mixed with a commercially available plastic raw material), it is long to completely and uniformly disperse the paper inevitably remaining in the recovered plastic. Various troubles occur, such as kneading over time and the need for additional additives. Depending on the mixing ratio of these recovered plastics in which the paper remains, the texture of the finally obtained recycled product (for example, soft vinyl chloride product) and the physical properties of the product become inferior.
On the other hand, paper collected by such a method cannot be recycled as recycled paper because of the remaining plastic.

(2) A method of dissolving and separating a resin layer of a plastic wallpaper with an organic solvent is performed. Furthermore, after the resin layer is swollen with an organic solvent, a method of mechanically scraping the resin layer from the substrate has been introduced (see Patent Document 1).

However, even with such a method, the paper derived from the base material is mixed in the plastic derived from the scraped resin layer, and the plastic derived from the resin layer remains on the base material ( It cannot be completely scraped off) and cannot be completely recycled (effective resource reuse).
Moreover, in such a method, the recovery cost of the used organic solvent is high, and it is necessary to clear the regulation of VOC (volatile organic compound).

(3) Further, as a method for reusing plastic wallpaper, it is pulverized and mixed with sand, and further, a deodorizing agent or the like is added to produce cat sand.

Although such a method is reuse of plastic wallpaper, it is ultimately disposed of as household waste and is not completely recycled (effective resource reuse).
Japanese Patent Laid-Open No. 9-59423

  In view of the above circumstances, the present inventor, as a method for separating and collecting paper and plastic from plastic wallpaper, disperses the cut pieces of plastic wallpaper in an aqueous solution of cellulose-degrading enzyme, and stirs the system. By doing so, the fraction collection method including the process of isolate | separating a base material from the resin layer in the said cutting piece is proposed (Japanese Patent Application No. 2008-257330).

As a specific separation and recovery method, an enzyme aqueous solution is contained in a dual-structure treatment tank consisting of an outer tank (tank body) having a bottom drain port and an inner tank made of a perforated plate in which many through holes are formed. In this processing tank, the cut pieces of plastic wallpaper are charged, and the system (dispersion of cut pieces) is mechanically stirred. As a result, the base material (paper) that formed the cut pieces was decomposed into fibers and formed a paper-containing suspension in a state separated from the resin layer, while the plastic that formed the resin layer The pieces are suspended and dispersed in the paper-containing suspension while maintaining the shape of the cut pieces.
Next, a paper-containing suspension that can pass through the perforated plate of the inner tank is discharged from the bottom drain of the processing tank (outer tank) and supplied to the centrifuge. The paper is filtered and collected by a separator.
On the other hand, the plastic piece remaining in the treatment tank (inner tank) is taken out after washing with water and sufficiently dried to obtain a plastic piece derived from the resin layer.

  According to such a separate collection method, since the paper that is the base material can be reliably separated from the resin layer constituting the plastic wallpaper, the plastic piece and the paper can be reliably collected separately, The collected plastic piece can be recycled as a recyclable (resource reusable) material.

  However, the above-described separation and recovery method has a problem that the fibrous paper once separated is reattached to the recovered plastic piece. For this reason, the process of wash | cleaning the collect | recovered plastic piece with water etc. is needed.

The present invention has been made based on the above situation.
An object of the present invention is to provide a separation and collection system and a separation and collection method capable of reliably collecting and collecting plastic pieces and paper from the cut pieces of the plastic wallpaper, so that the paper does not (re) attach to the plastic pieces. It is to provide.

  As a result of earnestly examining the recycling (resource reuse) method of plastic wallpaper that has been considered extremely difficult, the present inventor has focused on the fact that the main component of the paper constituting the base material of the wallpaper is cellulose fiber, Cellulose enzyme or cytolytic enzyme is an enzyme capable of degrading cellulose. By decomposing the substrate (paper) into fibers, the substrate is completely separated from the resin layer. As a result, plastic Found that paper and paper can be separated and recovered reliably, and the paper is filtered to return the aqueous enzyme solution flowing out of the filter to the separation tank (the aqueous enzyme solution containing the separation tank and the filter) The paper separated from the resin layer does not remain in the separation processing chamber, and the plastic pieces in the separation processing tank are It found that the paper is completely removed by purification, and have completed the present invention based on this finding.

That is, the separation and recovery system of the present invention disperses a piece of plastic wallpaper in which a resin layer is formed on a paper base material in an aqueous solution of an enzyme capable of degrading cellulose, and stirs the system. By separating the base material from the resin layer in the cutting piece, the system is for separating and collecting the paper decomposed into fibers derived from the base material and the plastic pieces derived from the resin layer ,
A separation tank (10) containing the enzyme aqueous solution;
The internal space of the separation processing tank (10) is provided so as to partition into a separation processing chamber (10A) in which the cut pieces are charged and a drainage chamber (10B) partitioned by a hopper-like bottom wall, and fibers A perforated plate (12) formed with a large number of through-holes having a diameter that allows the paper disassembled into a shape to pass therethrough but does not allow the cut pieces and plastic pieces to pass through;
A stirring shaft (21), a stirring blade (22), and a drive motor (23) are provided, and the dispersion of the cut pieces and / or plastic pieces is stirred in the separation processing chamber (10A) of the separation processing tank (10). A stirrer (20) for
Separating a paper-containing suspension (a suspension in which fibrous paper is contained in an enzyme aqueous solution) discharged from the drainage chamber (10B) of the separation processing tank (10) into paper and an enzyme aqueous solution. A filter (30) capable of
A first pipe line (P1) communicating the drainage chamber (10B) of the separation processing tank (10) and the inflow portion of the filter (30);
A second piping path (P2) communicating the outflow part of the filter (30) and the separation processing chamber (10A) of the separation processing tank (10);
The paper-containing suspension provided in the first pipe line (P1) or the second pipe line (P2) and discharged from the drainage chamber (10B) flows into the filter (30), and A first pump (41) for refluxing the aqueous enzyme solution flowing out from the filter (30) to the separation chamber (10A) of the separation tank (10);
A plastic dispersion receiving tank (50) for receiving a dispersion of plastic pieces contained in the separation processing chamber (10A) of the separation processing tank (10);
A plastic separating and collecting net (60) housed in the plastic dispersion receiving tank (50);
A third connected to the drain of the plastic dispersion receiving tank (50) and communicating between the inside of the plastic dispersion receiving tank (50) and the separation processing chamber (10A) of the separation processing tank (10). A pipeline (P3);
A second pipe for recirculating the enzyme aqueous solution provided in the third piping (P3) and discharged from the plastic dispersion receiving tank (50) to the separation processing chamber (10A) of the separation processing tank (10); A pump (42);
It is characterized by comprising.

In the fraction collection system of the present invention, it is preferable that the filter (30) comprises a filter press.
Moreover, it is preferable that the bottom part of the plastic separation / collection net (60) is configured to be openable and closable.
Further, during the separation process, the agitator (20) has the cut piece and / or an object derived from it (the plastic piece and the through hole) adsorbed on the perforated plate (12) so as to close the through hole. It is preferable to provide a cleaning means (25) for removing a paper lump that cannot be formed.

The separation and recovery method of the present invention is a method of separating and recovering paper and plastic pieces from plastic wallpaper by the separation and recovery system of the present invention,
In the separation processing chamber (10A) of the separation processing tank (10), the cut pieces of plastic wallpaper are charged, the cut pieces are dispersed in the aqueous enzyme solution, and the system is stirred by the stirrer (20). The filter (30) and the first pump (41) are operated, the separation processing chamber (10A), the drainage chamber (10B), the first piping (P1) of the separation processing tank (10), By circulating the enzyme aqueous solution using the filter (30) and the second pipe (P2) as a flow path, the base material is removed from the resin layer constituting the cut piece in the separation processing chamber (10A). A plastic piece obtained by separating and dispersing a plastic piece derived from the resin layer into a paper-containing suspension of paper derived from a base material (a suspension in which fibrous paper is contained in an enzyme aqueous solution). While obtaining a dispersion, The paper-containing suspension that has passed through the through-hole of the perforated plate (12) and flowed into the drainage chamber (10B) is discharged from the drainage chamber (10B). The first pump (41) is caused to flow into the filter (30) through the first pipe line (P1). In the filter (30), the paper and the enzyme aqueous solution are separated and separated. A step of refluxing the aqueous enzyme solution through the second piping (P2) to the separation processing chamber (10A) of the separation processing tank (10);
Stopping the circulation of the aqueous enzyme solution in the flow path, and collecting the paper separated by the filter (30);
A dispersion of plastic pieces, in which the plastic pieces are dispersed in an aqueous enzyme solution, remaining in the separation processing chamber (10A) of the separation processing tank (10) is transferred to the plastic dispersion receiving tank (50), and Plastic pieces are collected by the plastic fraction collection net (60) housed inside, and the enzyme aqueous solution remaining in the plastic dispersion receiving tank (50) is removed by the second pump (42) by the third pump. Refluxing the separation processing chamber (10A) of the separation processing tank (10) through the piping (P3);
It is characterized by including.

  In the fraction collection method of the present invention, after lifting and carrying out the plastic fraction collection net (60) from the plastic dispersion receiver tank (50), the bottom of the plastic fraction collection net (60) is opened, It is preferable to take out the plastic piece.

According to the separation and collection system and the separation and collection method of the present invention, it is possible to completely separate the paper that is the base material from the resin layer that constitutes the cut pieces of the plastic wallpaper. It can be collected separately.
Moreover, according to the fraction collection system and the fraction collection method of the present invention, the fibrous paper separated from the resin layer in the separation treatment chamber of the separation treatment tank is in the form of a paper-containing suspension formed in the enzyme aqueous solution. In this case, it flows into the filter through the drainage chamber and is separated by the filter, so that it does not remain in the dispersion processing chamber, and the enzyme aqueous solution flowing out from the filter is refluxed to the separation processing chamber. Therefore, the paper does not (re) adhere to the plastic piece remaining in the separation processing chamber. Therefore, the collected plastic pieces can be reused immediately without washing with water or the like.

Moreover, the function of a filter such as a filter press collects as much of the aqueous enzyme solution as possible contained in the paper to be collected, thereby reducing the loss of the aqueous enzyme solution and reducing the moisture content of the paper, which is required for drying. Energy costs can be reduced.
According to another embodiment of the present invention, the plastic separation / collection net whose bottom is configured to be openable / closable is unloaded from the plastic dispersion receiver tank, and then the bottom of the plastic separation / collection net is opened to remove the plastic piece. A large amount of plastic pieces can be collected quickly and easily.

  The plastic piece recovered according to the present invention has physical properties required for a reusable plastic by drying it, and can therefore be recycled as a recyclable (resource reusable) material.

  The paper collected according to the present invention is pure pulp containing no plastic and can be reused as a base material for recycled paper or wallpaper.

Hereinafter, the fraction collection method of the present invention will be described in detail.
<Separate collection system>
In the separation and recovery system of the present invention, an aqueous solution of an enzyme capable of degrading cellulose (hereinafter, abbreviated as “cellulose-degrading enzyme”) is formed on a plastic wallpaper having a resin layer formed on a paper substrate. By dispersing this in an (enzyme aqueous solution) and stirring the system, the substrate is separated from the resin layer in the cut piece, and the paper derived from the substrate and the plastic piece derived from the resin layer are separated. There is a separate collection system.

FIG. 1 is an explanatory diagram showing a schematic configuration of an embodiment of the fraction collection system of the present invention.
The separation collection system of this embodiment includes a separation processing tank 10, a perforated plate 12, a stirrer 20, a filter 30, a first piping line P1, a second piping path P2, a first pump 41, A plastic dispersion liquid receiving tank 50, a plastic separation / collection net 60, a third piping P 3, and a second pump 42 are provided.

The separation processing tank 10 has an internal space defined by a top plate, a cylindrical side wall, and a hopper-shaped bottom wall. The separation processing tank 10 is provided with a jacket 13 for circulating hot water or low-pressure steam. ing.
The top plate of the separation processing tank 10 is formed with a charging port 11A for charging the cut pieces. Reference numeral 11 denotes a lid of the charging port 11A, and the lid 11 is closed during the separation process.

  The internal space of the separation treatment tank 10 (the storage space for the enzyme aqueous solution) is divided into a separation treatment chamber 10A defined by a cylindrical side wall and a drainage chamber 10B defined by a hopper-shaped bottom wall by a perforated plate 12. It is partitioned.

  The separation processing tank 10 contains an aqueous enzyme solution (not shown), and a piece of plastic wallpaper is placed inside the separation processing tank 10 (separation processing chamber 10A), and the cutting piece is configured in the separation processing chamber 10A. The process which isolate | separates a base material from a resin layer is made | formed.

A perforated plate 12 that partitions the separation processing chamber 10 </ b> A and the drainage chamber 10 </ b> B is provided near the bottom of the separation processing tank 10.
The perforated plate 12 is a punching plate in which a large number of through holes are formed.
The thickness of the perforated plate 12 is 1 to 10 mm, for example. The diameter of the through hole formed in the perforated plate 12 is such that the paper-containing suspension (suspension in which fibrous paper is contained in the enzyme aqueous solution) and the enzyme aqueous solution can pass through, The plastic piece has a diameter that cannot pass, and is, for example, 4 to 6 mm.
The perforated plate 12 can separate the wallpaper fragments and / or the dispersion of plastic pieces into wallpaper and / or plastic pieces and paper-containing suspension and / or enzyme aqueous solution.

  Below the side wall of the separation processing tank 10, a drain port 14 </ b> A for discharging the liquid (a dispersion of plastic pieces) in the separation processing chamber 10 </ b> A is formed. The drain port 14A has an elbow pipe that guides the discharged liquid (dispersion liquid of plastic pieces) to the plastic dispersion liquid receiving tank 50 via an open / close valve 15A (closed during the separation process). A guide pipe 16 is attached. Here, for example, a butterfly valve can be used as the open / close valve 15A.

  On the bottom wall of the separation processing tank 10, a drain port 14B for discharging the liquid (paper-containing suspension or enzyme aqueous solution) in the drain chamber 10B is formed. An open / close valve 15B (opened during the separation process) is attached to the drain port 14B. Here, as the on-off valve 15B, for example, a ball valve can be used.

The agitator 20 is a means for agitating the liquid (wall paper fragments and / or plastic fragment dispersion) contained in the separation treatment chamber 10A of the separation treatment tank 10, and is driven by the agitation shaft 21 and the agitation blade 22. And a motor 23.
The shape and size of the stirring blade 22 are not particularly limited as long as the cut pieces of the wallpaper can be dispersed in the aqueous enzyme solution.

During the separation process, the stirrer 20 removes the above-mentioned cut pieces adsorbed on the perforated plate 12 so as to block the through-holes and / or substances derived therefrom (plastic pieces / paper chunks that cannot pass through the through-holes). Cleaning means 25 is provided.
For example, the cleaning means 25 is formed by implanting a plurality of linear members 252 having a certain rigidity on the lower surface of the stirring blade 251 attached to the lower end of the stirring shaft 21. In addition, it may replace with the linear member 252 and the nail | claw-shaped member may be planted.
As a result of removal of the cut pieces adsorbed on the perforated plate 12 so as to block the through-holes by the cleaning means 25, liquid (paper-containing suspension or enzyme aqueous solution) from the separation processing chamber 10A to the drainage chamber 10B is removed. ), And thus the liquid can be circulated smoothly.

The filter 30 is means for separating (solid-liquid separation) the paper-containing suspension discharged from the drain chamber 10B of the separation processing tank 10 into paper and an enzyme aqueous solution.
A suitable filter 30 can include a filter press. By using a filter press, the water content of the paper can be reduced, the loss of the enzyme aqueous solution can be suppressed, and the energy cost required for drying can be reduced.

  The first pipe line P1 is a pipe line that communicates the drainage chamber 10B of the separation processing tank 10 and the inflow portion of the filter 30, and the paper-containing suspension discharged from the drainage chamber 10B (drainage port 14B). It becomes a flow path when supplying the turbid liquid to the filter 30.

  The second piping P2 is a pipe line that communicates the outflow portion of the filter 30 and the separation processing chamber 10A of the separation processing tank 10, and separates the aqueous enzyme solution flowing out from the filtering device 30 from the separation processing tank 10. It becomes a flow path at the time of refluxing to the chamber 10A.

A first pump 41 is provided in the first pipeline P1.
The first pump 41 flows (transfers) the paper-containing suspension discharged from the drainage chamber 10B (drainage port 14B) into the filter 30 and separates the enzyme aqueous solution flowing out from the filter 30. This is a pressure feed pump for refluxing the separation processing chamber 10A of the processing tank 10. Suitable first pump 41 includes a high pressure diaphragm pump, a gear pump, and the like.

The plastic dispersion liquid receiving tank 50 is a dispersion of plastic pieces discharged from the separation processing chamber 10A (drainage port 14A) of the separation processing tank 10 after completion of the separation processing (the state where the plastic pieces are floating in the enzyme aqueous solution). A dispersion liquid).
The plastic dispersion liquid receiving tank 50 has an internal space defined by a cylindrical side wall and a hopper-like bottom wall, the upper part (top surface) is opened, and a liquid (enzyme) contained in the bottom wall is contained in the bottom wall. A drainage port for discharging the aqueous solution) is formed.

The plastic separation / collection net 60 housed in the plastic dispersion receiving tank 50 is made of synthetic fibers such as nylon and polyester.
The mesh size of the plastic separation / collection net 60 can be appropriately selected according to the size of the plastic piece to be collected (the cut piece that has been loaded).

The upper part (top surface) of the plastic sorting and collecting net 60 is open.
On the other hand, the bottom of the plastic sorting and collecting net 60 is configured to be openable and closable. That is, in the plastic dispersion liquid receiving tank 50, the bottom part of the plastic separation / collection net 60 is tightly bound and closed by a rope (not shown) or the like, but after unloading from the plastic dispersion liquid receiving tank 50, the rope is unwound. Thus, the bottom can be opened.

  The third pipe line P3 is connected to the drain port of the plastic dispersion liquid receiving tank 50, and communicates the inside of the plastic dispersion liquid receiving tank 50 with the separation processing chamber 10A of the separation processing tank 10. This is a flow path when the aqueous enzyme solution discharged from the dispersion receiving tank 50 is returned to the separation processing chamber 10A of the separation processing tank 10.

A second pump 42 is provided in the third pipeline P3.
The second pump 42 is a pump for recirculating the enzyme aqueous solution discharged from the plastic dispersion receiving tank 50 to the separation processing chamber 10 </ b> A of the separation processing tank 10.

<Separate collection method>
Next, a method for separately collecting plastic and paper from plastic wallpaper, which is performed using the separate collection system of the present embodiment, will be described.

[1] Layer separation of cut pieces and paper filtration step:
In this step, the opening / closing valve 15A is closed and the opening / closing valve 15B is opened.
In the separation processing chamber 10A of the separation processing tank 10 containing the aqueous enzyme solution, the cut pieces of plastic wallpaper are charged, the cut pieces are dispersed in the aqueous enzyme solution, and this system (enzyme aqueous solution in which the cut pieces are dispersed) While stirring with the stirrer 20 (stirring blade 22 and stirring blade 251), the filter 30 and the first pump 41 are operated, so that the separation processing chamber 10A, the drainage chamber 10B, the first piping path of the separation processing tank 10 are operated. The aqueous enzyme solution is circulated using P1, the filter 30, and the second piping P2 as flow paths.

  Thereby, the paper which comprises a base material is decomposed | disassembled, and a base material (paper decomposed | disassembled into the fiber form) is isolate | separated from the resin layer, In the separation processing chamber 10A, it becomes the paper containing suspension by the paper derived from a base material. A plastic fragment dispersion is obtained by floating and dispersing plastic pieces derived from the resin layer in which the shape of the cut pieces is maintained, and this plastic piece dispersion (paper-containing suspension in which the plastic pieces are dispersed) is obtained. ), The paper-containing suspension that has passed through the through-hole of the perforated plate 12 and has flowed into the drainage chamber 10B is discharged from the drainage chamber 10B, and the first pump 41 causes the first piping line P1. It passes through the filter 30 and is separated into paper and an aqueous enzyme solution. The separated enzyme aqueous solution passes through the second piping P2 and is returned to the separation processing chamber 10A of the separation processing tank 10.

Along with the discharge of the paper-containing suspension in the drainage chamber 10B, the paper-containing suspension in the separation processing chamber 10A passes through the perforated plate 12 and moves to the drainage chamber 10B. The enzyme aqueous solution from the filter 30 is supplied. In this way, the aqueous enzyme solution (from the separation treatment tank 10 to the filtration device) using the separation treatment chamber 10A, the drainage chamber 10B, the first piping path P1, the filter 30 and the second piping path P2 of the separation processing tank 10 as flow paths. A paper-containing suspension) is circulated in the flow path reaching 30. As a result, the amount of liquid in the separation processing tank 10 is maintained constant, and in parallel with the separation processing (generation of paper decomposed into fibers) in the separation processing chamber 10A, in the filter 30 located downstream. Since the paper is continuously filtered, the content ratio of the paper in the paper-containing suspension inside the separation processing tank 10 (separation processing chamber 10A / drainage chamber 10B) decreases with time. In this case, the enzyme aqueous solution not containing paper circulates in the flow path, and the plastic piece in the separation processing chamber 10A is washed with the enzyme aqueous solution. As a result, the paper does not (re-) adhere to the plastic piece.
After confirming that the aqueous enzyme solution containing substantially no paper is circulating in the flow path, the stirring process by the stirrer 20 is stopped, and the filter 30 and the first pump 41 are operated (circulation of the aqueous enzyme solution). Is stopped, the on-off valve 15B is closed, and this process is completed.
At the end of this step, in the separation processing chamber 10A of the separation processing tank 10, a dispersion of plastic pieces (enzyme aqueous solution in which the plastic pieces are dispersed) exists, and paper derived from the substrate does not exist.

The cellulose-degrading enzyme constituting the enzyme aqueous solution is not particularly limited as long as it is an enzyme having an activity of degrading natural cellulose, which is an insoluble substrate, and it is called a cell wall (membrane) lytic enzyme agent or a cytolytic enzyme agent. What can be used can be used suitably.
Examples of the cellulolytic enzyme include cellulase, pectinase, hemicellulase, β-glucanase, xylanase, mannase and amylase.

  These cellulose-degrading enzymes (cellulases) are commercially available as fiber modifiers and fiber treatment agents. Commercially available cellulolytic enzymes include “Cellulase GODO TCL” (manufactured by Godo Seisei Co., Ltd.), “Cellulase“ Onozuka ”3S” (manufactured by Yakult Yakuhin Kogyo Co., Ltd.), “Entilon CM-40L” (Nakto Kasei Kogyo Co., Ltd.) Company-made), “Entilon GK-200” (manufactured by Nitto Kasei Kogyo Co., Ltd.), “Dolylase 20” (manufactured by Kyowa Hakko Co., Ltd.), “Cellulase A“ Amano ”3” (Amano Enzyme Co., Ltd.), etc. be able to.

  The concentration of the cellulolytic enzyme in the enzyme aqueous solution is usually 0.005 to 10% by mass, preferably 0.05 to 5% by mass.

  The hydrogen ion concentration of the aqueous enzyme solution differs depending on the type of cellulose-degrading enzyme in the aqueous enzyme solution (specifications of commercially available products), but the hydrogen ion concentration index (pH) is 3 from the viewpoint of maintaining the activity and stability of cellulose degradation. It is preferable that it is the range of -10. The pH value can be appropriately adjusted by adding an acid or an alkali.

  As the acid used to adjust the hydrogen ion concentration index (pH) of the aqueous enzyme solution to acidity (<7), it is possible to use inorganic acids such as hydrochloric acid, sulfuric acid, nitric acid, food additives, etc. It is preferable from the viewpoint of the environment to use the weak organic acid used as.

Examples of the weak organic acid include citric acid, tartaric acid, malic acid, acetic acid, oxalic acid, succinic acid, and gluconic acid.
The density | concentration of the organic weak acid used in order to adjust pH of aqueous solution, for example in the range of 4-5 shall be 0.0005-5 mass% normally.

  Bases such as sodium hydroxide and potassium hydroxide can be used as the alkali used to adjust the hydrogen ion concentration index (pH) of the aqueous enzyme solution to alkalinity (7 <). In addition, it is preferable to use a weak alkali that can be added to food.

Examples of the weak alkali include salts such as sodium bicarbonate, ammonium bicarbonate, sodium tartrate, potassium sodium tartrate, sodium phosphate, sodium citrate, sodium acetate and the like.
The concentration of the alkali used to adjust the pH of the aqueous enzyme solution, for example, in the range of 8 to 10, is usually 0.001 to 10% by mass, preferably 0.01 to 5% by weight.

The shape of the cut pieces to be dispersed in the enzyme aqueous solution is not particularly limited, but a quadrangle, particularly a square is preferable.
Further, the preferred size of the cut piece depends on the scale of the processing equipment and the stirring method, but from the viewpoint of facilitating the collection of the plastic and paper and maintaining the quality of the collected paper, for example, 1 cm ² (for example, 1 cm × 1 cm) or more, more preferably 1 to 2,500 cm ² , and particularly preferably 1 to 1,000 cm ² .

  When the size of the cut pieces is too small (for example, when pulverized by a pulverizer), it becomes difficult to separate and collect these in the plastic recovery process and the paper recovery process, and the collected paper is mixed with plastic. For this reason, the quality may be reduced.

The cutting method for obtaining the cut pieces is not particularly limited.
In addition, the “cutting piece” includes wallpaper scraps or scraps (the cutting step is not essential).

The amount (preparation amount) of the cut pieces to be dispersed in the enzyme aqueous solution can be appropriately adjusted depending on the expansion ratio of the resin layer.
Here, the amount of the cut pieces of the wallpaper (non-foamed product) having the non-foamed resin layer is 10 to 18 parts by mass with respect to 100 parts by mass of the enzyme aqueous solution.
Moreover, the preparation amount of the cut piece of the wallpaper (low foaming product) which has a low foaming resin layer (foaming ratio = 2-4 times) shall be 10-15 mass parts with respect to 100 mass parts of enzyme aqueous solution.
Moreover, the preparation amount of the cut piece of the wallpaper (high foaming product) which has a highly foamed resin layer (foaming ratio = 5-8 times) shall be 8-12 mass parts with respect to 100 mass parts of enzyme aqueous solution.

  The temperature at the time of stirring (treatment temperature) varies depending on the type of cellulose-degrading enzyme in the aqueous solution (specifications of commercially available products), but is preferably 20 to 70 ° C. from the viewpoint of maintaining the activity of the cellulose-degrading enzyme.

  Separation treatment time (stirring time = circulation time of the enzyme aqueous solution) includes the type of plastic that constitutes the resin layer of the cut piece, the degree of polymerization, the type and amount of plasticizer used, foamability and expansion ratio, degree of embossing, cellulose Although it depends on the type and amount of the degrading enzyme and the treatment temperature, the separation of the substrate from the resin layer of the cut pieces can be completed usually in 2 to 4 hours.

[2] Paper collection process:
In this step, the paper separated (filtered) by the filter 30 is collected. The collected paper is sent to a drying process (not shown).

[3] Separating and collecting plastic pieces:
In this step, the opening / closing valve 15A is opened, and the plastic fraction dispersion net (enzyme aqueous solution in which the plastic pieces are dispersed) remaining in the separation processing chamber 10A of the separation processing tank 10 is stored in the plastic fraction collection net 60. The plastic dispersion receiving tank 50 is moved.

  Next, as shown in FIG. 2, after the plastic separation / collection net 60 is lifted and a plastic piece (not shown) is unloaded from the plastic dispersion receiving tank 50, the bottom of the plastic separation / collection net 60 is bound. The plastic piece is dropped into the collection container 70 by releasing the rope and opening the bottom. According to such a configuration, a large amount of plastic pieces (heavy objects) can be collected quickly and easily. The plastic piece taken out from the plastic separation / collection net 60 is sent to a drying step (not shown).

  The aqueous enzyme solution remaining in the plastic dispersion receiving tank 50 is returned to the separation processing chamber 10A of the separation processing tank 10 through the third piping P3 by the second pump 42.

  According to the separation and recovery method of the present embodiment, the fibrous paper separated from the resin layer in the separation processing chamber 10A of the separation processing tank 10 is discharged in the form of a paper-containing suspension dispersed in an enzyme aqueous solution. Since it flows into the filter 30 through the chamber 10B and is separated by the filter 30, it does not remain in the dispersion processing chamber 10A, and the aqueous enzyme solution that does not contain paper flowing out of the filter 30 is separated. Since it is returned to the processing chamber 10A, the paper does not (re) adhere to the plastic pieces remaining in the separation processing chamber 10A. Therefore, the collected plastic pieces can be reused immediately without washing with water or the like.

EXAMPLES Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited to these Examples.
The fraction collection method according to this example was performed using a fraction collection system configured as shown in FIG. The apparatus constituting this separation and collection system is as follows.

(1) Separation processing tank 10:
・ Material: SUS304
・ Contents: 6000L
-It has the jacket 13 in which warm water circulation heating is possible.

(2) Perforated plate 12 (punching plate):
・ Material: SUS304
・ Thickness: 3mm
・ Through hole diameter: 6mm

(3) Filter 30:
・ Fully automatic compression filter press (Makino Co., Ltd.)

(4) First pump 41:
・ Gear pump "OH-15G type" (Daito Kogyo Co., Ltd.)

(5) Second pump 42 (pumping pump):
・ Multistage centrifugal pump made of MSN nylon coating

(6) Plastic dispersion tank 50:
・ Material: SUS304
・ Contents: 5000L

(7) Plastic separation collection net 60 (bottom opening / closing):
・ Nylon net (20 mesh)
・ Contents: about 1200L

(8) Open / close valve 15A:
・ Butterfly valve (diameter = 300mm)

(9) Open / close valve 15B:
・ Ball valve "Z600 type 50A" (manufactured by KITZ Corporation)

<Example 1>
[1] Cutting process (previous process):
A plastic wallpaper (manufactured by Nippon Vinyl Industry Co., Ltd.) having a resin layer made of polyvinyl chloride was cut with a hydraulic cutting machine (manufactured by Maruzei Seisakusho Co., Ltd.) to obtain a cut piece of 200 mm × 200 mm.

[2] Separation layer separation and paper filtration step:
The on-off valve 15A and the on-off valve 15B are closed, and in the separation treatment tank 10, 20 kg of a commercially available cellulase “Entilon GK-200” (manufactured by Nitto Kasei Kogyo Co., Ltd.) is dissolved in 5000 L of water to give a pH of 6 .8 enzyme aqueous solution (cellulase concentration = 0.4%) was prepared. Next, 70 ° C. warm water was circulated through the jacket 13 to raise the temperature of the aqueous enzyme solution to 30 ° C.
Next, 500 kg of the cut pieces obtained in the cutting step are charged into the separation processing tank 10, and stirring of the aqueous enzyme solution in which the cut pieces are dispersed is started by the stirrer 20 (the stirring blade 22 and the stirring blade 251). The opening / closing valve 15B is opened, the filter 30 and the first pump 41 are operated, the separation processing tank 10 (separation processing chamber 10A / drainage chamber 10B), the first piping line P1, the filtering device 30, and the second piping path. The enzyme aqueous solution was circulated using P2 as a flow path. Here, the liquid temperature in the separation treatment tank 10 was controlled at 30 ° C., and the stirring speed was 20 rpm.

As a result, the paper constituting the base material of the cut pieces is disassembled, the paper disassembled into fibers is separated from the resin layer, and the plastic pieces are suspended and dispersed in the paper-containing suspension in the separation processing chamber 10A. In this dispersion of plastic pieces, the paper-containing suspension that has flowed into the drainage chamber 10B through the through-holes of the perforated plate 12 is dispersed in the drainage chamber 10B. The first pump 41 flows into the filter 30 through the first piping P1, and the filter 30 separates the paper and the aqueous enzyme solution. The separated enzyme aqueous solution was refluxed to the separation processing chamber 10A of the separation processing tank 10 through the second piping P2.
The stirring operation in the separation processing chamber 10A and the circulation of the aqueous enzyme solution in the flow path (separation processing chamber 10A → drainage chamber 10B → first piping P1 → filter 30 → second piping P2 → separation processing chamber 10A) 3 Continued over time.
During this time, due to the back pressure by the first pump 41, the cut piece, the plastic piece, and the lump of paper are adsorbed by the through hole on the surface (through hole forming surface) of the perforated plate 12 in the separation processing chamber 10A. Although some of the holes are blocked, since these were immediately removed by the cleaning means 25 (linear member 252), the liquid (paper-containing suspension or aqueous enzyme solution) was transferred from the separation processing chamber 10A to the drainage chamber 10B. Was done smoothly.

  The paper as the base material could be completely separated from the resin layer constituting the cut pieces by stirring operation and circulation treatment (paper filtration treatment) for 3 hours. Moreover, substantially all of the separated paper derived from the base material was filtered by the filter 30, and the enzyme aqueous solution circulated through the flow path did not contain paper. The pH of the aqueous enzyme solution after lapse of 3 hours was 6.9, almost unchanged from before the treatment.

[3] Paper collection process:
After the completion of the stirring operation and the circulation treatment for 3 hours, the operation of the filter 30 and the first pump 41 was stopped, the open / close valve 15B was closed, and the paper separated by the filter 30 (filter press) was taken out. . The content of water (enzyme aqueous solution) in the removed paper was 66% on average. The taken out paper was dried by a box-type hot air circulating dryer. The mass of paper recovered in this way (dry mass) was 99.5 kg.

[4] Separating and collecting plastic pieces:
The on-off valve 15A was opened, and the dispersion liquid of the plastic pieces remaining in the separation processing chamber 10A was transferred to the plastic dispersion liquid receiving tank 50 in which the plastic separation / collection net 60 was accommodated. Thereafter, as shown in FIG. 2, the plastic separation / collection net 60 is picked up by a chain block (not shown) and the plastic piece (not shown) is unloaded from the plastic dispersion receiving tank 50. The bottom of the container was opened, the plastic piece was dropped into the collection container 70, and dried by a box-type hot air circulating dryer.

Further, the aqueous enzyme solution remaining in the plastic dispersion receiving tank 50 is discharged from the drainage port, the second pump 42 is operated, and the separation processing chamber 10A of the separation processing tank 10 is passed through the third piping P3. To reflux.
The mass (dry mass) of the plastic pieces collected as described above was 400 kg, and no paper adhesion was observed on these plastic pieces.

It is explanatory drawing which shows schematic structure of one Embodiment of the fraction collection system of this invention. It is explanatory drawing which shows typically collection | recovery operation of a plastic piece.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Separation processing tank 10A Separation processing chamber 10B Drainage chamber 11 Cover 12 Perforated plate 13 Jacket 14A Drainage port 14B Drainage port 15A Open / close valve 15B Open / close valve 16 Guide pipe 20 Stirrer 21 Stirring shaft 22 Stirring blade 23 Drive motor 25 Cleaning means 251 Stirrer blade 252 Linear member 30 Filter 41 First pump 42 Second pump 50 Plastic dispersion liquid receiving tank 60 Plastic fraction collection net 70 Recovery container P1 First piping path P2 Second piping path P3 Third piping path

Claims (6)

The resin layer in the above-mentioned fragment is obtained by dispersing a fragment of a plastic wallpaper in which a resin layer is formed on a base material made of paper and dispersing the cellulose in an aqueous solution of an enzyme capable of degrading cellulose, and stirring the system. Separating the base material from the paper, and separating and collecting the paper decomposed into fibers derived from the base material and the plastic pieces derived from the resin layer,
A separation tank (10) containing the enzyme aqueous solution;
The internal space of the separation processing tank (10) is provided so as to partition into a separation processing chamber (10A) in which the cut pieces are charged and a drainage chamber (10B) partitioned by a hopper-like bottom wall, and a fiber A perforated plate (12) formed with a large number of through-holes having a diameter that allows the paper disassembled into a shape to pass therethrough but does not allow the cut pieces and plastic pieces to pass through;
A stirring shaft (21), a stirring blade (22), and a drive motor (23) are provided, and the dispersion of the cut pieces and / or plastic pieces is stirred in the separation processing chamber (10A) of the separation processing tank (10). A stirrer (20) for
A filter (30) capable of separating the paper-containing suspension discharged from the drainage chamber (10B) of the separation treatment tank (10) into paper and an aqueous enzyme solution;
A first piping (P1) communicating the drainage chamber (10B) of the separation processing tank (10) and the inflow portion of the filter (30);
A second pipe line (P2) communicating the outflow part of the filter (30) and the separation processing chamber (10A) of the separation processing tank (10);
The paper-containing suspension provided in the first pipeline (P1) or the second pipeline (P2) and discharged from the drainage chamber (10B) flows into the filter (30), and A first pump (41) for refluxing the aqueous enzyme solution flowing out from the filter (30) to the separation chamber (10A) of the separation tank (10);
A plastic dispersion receiving tank (50) for receiving a dispersion of plastic pieces contained in the separation processing chamber (10A) of the separation processing tank (10);
A plastic separating and collecting net (60) housed in the plastic dispersion receiving tank (50);
A third connected to the drain of the plastic dispersion receiving tank (50) and communicating between the inside of the plastic dispersion receiving tank (50) and the separation processing chamber (10A) of the separation processing tank (10). A pipeline (P3);
A second pipe for recirculating the enzyme aqueous solution provided in the third piping (P3) and discharged from the plastic dispersion receiving tank (50) to the separation processing chamber (10A) of the separation processing tank (10); A pump (42);
A system for separating and collecting plastic and paper from plastic wallpaper.   The fraction collection system according to claim 1, wherein said filter (30) consists of a filter press.   The fraction collection system according to claim 1 or 2, wherein the plastic fraction collection net (60) is configured to be openable and closable at the bottom.   The stirrer (20) is provided with a cleaning means (25) for removing the cut pieces and / or objects derived therefrom adsorbed on the perforated plate (12) so as to close the through hole. The fraction collection system according to any one of claims 1 to 3 characterized by things. A method for separating and collecting paper and plastic pieces from plastic wallpaper by the separate collection system according to any one of claims 1 to 4,
In the separation processing chamber (10A) of the separation processing tank (10) containing the enzyme aqueous solution, the cut pieces of the plastic wallpaper are charged, the cut pieces are dispersed in the enzyme aqueous solution, and this system is mixed with the stirrer (20). While stirring, the filter (30) and the first pump (41) are operated to separate the separation treatment chamber (10A), the drainage chamber (10B), and the first pipe of the separation treatment tank (10). Resin that forms the cut pieces in the separation processing chamber (10A) by circulating the enzyme aqueous solution using the passage (P1), the filter (30), and the second piping passage (P2) as a flow passage. The substrate is separated from the layer, and a plastic piece dispersion obtained by dispersing a plastic piece derived from the resin layer in a paper-containing suspension of paper derived from the substrate is obtained. of That is, the paper-containing suspension that has passed through the through hole of the perforated plate (12) and flowed into the drainage chamber (10B) is discharged from the drainage chamber (10B), and the first pump ( 41) to flow into the filter (30) through the first pipe line (P1), and in the filter (30), the paper is separated into paper and the aqueous enzyme solution. Refluxing the separation processing chamber (10A) of the separation processing tank (10) through the piping (P2);
Stopping the circulation of the aqueous enzyme solution in the flow path, and collecting the paper separated by the filter (30);
The plastic dispersion in which the plastic pieces are dispersed in the enzyme aqueous solution remaining in the separation processing chamber (10A) of the separation processing tank (10) is transferred to the plastic dispersion receiving tank (50), Plastic pieces are collected by the plastic fraction collection net (60) housed inside, and the enzyme aqueous solution remaining in the plastic dispersion receiving tank (50) is removed by the second pump (42) by the third pump. Refluxing the separation processing chamber (10A) of the separation processing tank (10) through the piping (P3);
A method for separating and collecting plastic and paper from plastic wallpaper characterized by comprising: A method for separating and collecting paper and plastic pieces from plastic wallpaper by the separate collection system according to claim 3,
After lifting and unloading the plastic fraction collection net (60) from the plastic dispersion receiving tank (50), the bottom of the plastic fraction collection net (60) is opened and the plastic piece is taken out. The fraction collection method according to claim 5.

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