JP2019035168A - Production method of paper material using paper chips separated from a waste gypsum board as a raw material and production apparatus thereof, and animal bedding material - Google Patents

Abstract

To provide a production method of a paper material capable of minimizing or reducing an amount of deposited gypsum to zero without firing a waste gypsum board, and even when remaining, capable of suppressing separating and scattering of deposited gypsum.SOLUTION: The production method of a paper material using a paper chip separated from a waste gypsum board as a raw material contains: a crush step of crushing a waste gypsum board to a predetermined shape or a size; a paper chip recovery step of separating and recovering a paper chip from the crushed product; an in-water agitation and crushing step of loading the separated paper chip into a water and disintegrating to give a pulp liquid having a plant tissue dispersed and suspended in the water; a pulp recovery step of separating the gypsum and water involved in the pulp liquid and separating the pulp; a paper material molding process of molding the pulp to a prescribed shape; and a drying step of drying the molded paper material at a predetermined temperature.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a paper material manufacturing method and manufacturing apparatus using a piece of paper separated from waste gypsum board as a raw material, and animal litter, and more specifically, a piece of paper from gypsum board waste material (hereinafter referred to as waste gypsum board). The present invention relates to a method and apparatus for producing a paper material using the paper piece as a raw material, and an animal bedding using the paper material.

  A gypsum board is a board made of baked gypsum, mixed with sawdust, pearlite, foam, etc., kneaded with water and poured into a paste between two sheets of paper. Since it is excellent in fireproofing, sound insulation and non-stretchability and is inexpensive, it has been used for interior materials such as buildings, for example, walls, partitions, ceilings, etc. for a long time. In recent years, due to the evolution of its manufacturing technology and construction method, and the development of new materials, gypsum boards with various performances, such as sizing gypsum boards with double-sided base paper and core gypsum waterproofed, and gypsum Reinforced gypsum board with glass fiber added to the core to enhance fire resistance, plasterboard with half-penetrating embossed gypsum plaster board for painting walls in residential Japanese-style rooms, decorative gypsum board with cosmetic finish on the surface, and small holes A wide variety of boards have been developed and commercialized, such as a perforated gypsum board for sound absorption that exhibits an excellent sound absorption effect for mid to low frequencies.

  Since hundreds of thousands of tons of such gypsum board are manufactured and used annually, the used gypsum board will be used as waste material and discharged in large quantities in the future. This waste material is generated as scrap material such as scraps and scraps (hereinafter referred to as new construction waste material) when it is cut into a predetermined size at a new construction site such as a house in the case of a new board. On the other hand, in the dismantling of existing buildings, the dismantled materials are generated as waste materials (hereinafter referred to as dismantling waste materials), and at present, the latter occurs in a larger amount than the former. In the future, this trend will continue and it is expected that more dismantling waste will be generated.

  Among these waste materials, some of the newly constructed waste materials are reused as raw materials for the production of new gypsum board, but the remaining new constructed and dismantled waste materials are disposed of as industrial waste in the same manner as other waste. It has been disposed of. However, in this landfill disposal, the waste gypsum board is metabolized by sulfate-reducing bacteria inhabiting the groundwater and becomes a source of toxic hydrogen sulfide. On the other hand, management-type disposal sites are tight, and securing them in the suburbs of cities is becoming difficult year by year, and securing these disposal sites has become a major environmental and social problem.

In this situation, efforts are being made to recycle (recycle) waste gypsum board instead of landfilling it. However, the following issues have been pointed out.
There is a general understanding amongst the general public that recycled products should be cheaper than virgin materials, while the reality is that processing costs are higher than expected and this is reflected in the recycled products. Since it is expensive, the recycling of waste gypsum board has been discouraged, and in the end, most of it is buried in a managed final disposal site. In addition, burying in stable final disposal sites is prohibited.

  In addition, some gypsum boards currently contain harmful substances such as asbestos, arsenic, and cadmium, and it is necessary to deal with them. Currently, some of these treatment technologies and additives are in practical use. However, the processing cost is high, which is a problem of recycling. In the past, there were various problems with this harmful substance, which hindered the expansion of the market for recycled products.

  In addition, for the recycling of release paper peeled from waste gypsum board, a part of it is a raw material for the production of recycled paper, but the general understanding is that recycling is similar to the recycling of gypsum. Due to the high price of the products, recycling of release paper is also encouraged, and most of them are incinerated or buried in managed final disposal sites. Currently, this release paper is partly made into RPF (solid fuel with waste plastics as the main raw material), but there are restrictions such as fluctuations in supply and demand due to market prices and separation costs for gypsum. Therefore, there is an urgent need to expand applications other than RPF.

  Under these circumstances, research and development of recycling of waste gypsum board has been conducted in some companies, and the results have been proposed in several patent documents.

  The following Patent Document 1 (Japanese Patent No. 40354419) describes a method and a separating apparatus for separating a piece of paper from waste gypsum board, and an animal bedding using the separated piece of paper. This paper piece separation method includes a crushing step for crushing waste gypsum board to a size suitable for firing, a firing step for firing the crushed waste gypsum board, and a waste gypsum board calcined in the firing step with gypsum-attached paper pieces and gypsum. A preliminary sieving step for separating the gypsum-attached paper piece separated by the preliminary sieving step, a sieving step for separating the gypsum and the paper piece separated from the gypsum-attached paper piece pneumatically transported, The paper piece is separated from the waste gypsum board through a series of steps.

  According to this paper piece separation method, waste gypsum board is pulverized and fired, dihydrate gypsum is made into half-water gypsum, this is subjected to the air transport process, and the gypsum content and paper content are separated by sieving with a simple ordinary sieve When this is done, it is possible to efficiently separate and collect a piece of paper with less adhering gypsum (half water gypsum). In addition, by firing the waste material at a temperature of 100 ° C. or higher, it is possible to sterilize or kill mold, mites, etc. adhering to the waste material. Can be reused.

  The following Patent Document 2 (Japanese Patent No. 3221940) is a method for recovering gypsum from gypsum board waste, and gypsum board waste in which gypsum board base paper adheres to at least a part of the gypsum board core. Is heated to carbonize the base paper.

  Further, the following Patent Document 3 (Patent No. 3221939) is a method for recovering gypsum board base paper and gypsum from gypsum board waste, and the gypsum board base paper is attached to at least a part of the gypsum board core. After the waste material of the gypsum board is heated, water is applied to separate the base paper from the gypsum core, and the base paper and the gypsum constituting the gypsum core are collected.

  Furthermore, the following Patent Document 4 (Patent No. 4371801) describes a method for producing α-type hemihydrate gypsum from waste gypsum board and a method for collecting gypsum board base paper. This recovery method is a method in which waste gypsum board is subjected to wet heat treatment under pressure to separate the gypsum core transferred to α-type hemihydrate gypsum and the base paper for gypsum board, in hot water or in a steam atmosphere. It is characterized by doing. According to this method, gypsum without paper (paper pieces and paper fibers) and base paper without gypsum adhesion are recovered from waste materials and are effective as raw materials for manufacturing gypsum building materials, used paper, agriculture, and other industries. Available to:

  Furthermore, the following Patent Document 5 (Japanese Patent Laid-Open No. 2001-294696) describes a technique that can use paper in waste gypsum board as a moisture adjusting material for cow manure for manufacturing compost. This technology is a method for producing compost characterized by using paper after separating gypsum and paper from gypsum board waste as a moisture control material for livestock manure, crushing gypsum board waste Gypsum and paper are separated, and the paper after this separation is crushed again to remove the gypsum adhering to the paper, and the paper is used as a moisture adjusting material. According to this method, compared with the conventional compost production method using sawdust as a moisture adjusting material, the period until ripeness can be greatly shortened, and further, it has been treated as waste in the past. There is an effect that the recovered paper from the waste gypsum board can be reused.

  In addition, the following patent document 6 (Unexamined-Japanese-Patent No. 2015-16440) describes the methane fermentation method, a straw material, and bedding. This methane fermentation method is a method in which cocoons are crushed into pieces of 10 mm to 100 mm and methane fermentation is performed at a temperature of 50 ° C. or higher. According to this method, it is possible to provide sanitary dredging materials and bedding as compared with those conventionally pulverized to the micron order, and a sufficient amount of biogas can be recovered by methane fermentation.

Japanese Patent No. 4035419 Japanese Patent No. 3221940 Japanese Patent No. 3221939 Japanese Patent No. 4371801 JP 2001-294696 A JP2015-16440

  Separation / recovery of gypsum and paper pieces from waste gypsum board described in Patent Documents 1 to 4 is carried out through steps such as firing, heating (paper carbonization) and pressurized wet heating of the waste gypsum board. However, these processing methods and processing apparatuses are complex and generally large-scale processing facilities, which require large capital investment and running costs such as fuel costs, which are reflected in the price of recycled products and are expensive. As a result, it is difficult to obtain profits commensurate with investment, and there is a problem with profitability.

  In addition, the paper piece is expensive and can not be expected to expand its use, and since the paper piece is maintained in the shape of the paper and the gypsum adheres to the paper surface, the gypsum is easily separated. Yes. Also, the gypsum to be separated is dihydrate gypsum (needle-like tissue), which is heated to a predetermined temperature to make a half-water gypsum or anhydrous gypsum, which can be easily separated and collected. It tends to adhere and remain in the form of anhydrous gypsum.

  By the way, if gypsum (especially half-water or anhydrous gypsum) remains on the piece of paper, it will be separated and scattered during use, especially finely pulverized and scattered to the surroundings, causing damage and being safe and secure (hereinafter, safe and secure). May also be unusable. For example, if this dust is inhaled by humans, it will adversely affect health, and if used for livestock bedding such as dairy cows, dairy cows may have a similar adverse effect. The same applies to other industrial fields. In addition, the bedding of the said patent document 5 also has the same subject. Moreover, the bedding of the above-mentioned patent document 6 is a method of crushing straw into a predetermined size and performing methane fermentation at a predetermined temperature. However, recently, the straw material is insufficient, and it is difficult to obtain a stable and expensive product. Yes.

  From the above, the recycling of waste gypsum board so far has been drought or stagnation due to the fact that the total cost has risen due to large and expensive processing facilities and running costs, etc. There is an urgent need to reduce this total cost. On the other hand, gypsum adheres to the separated paper pieces and is scattered.

  Therefore, the present inventors have simplified the processing method or processing apparatus of the prior art to reduce the processing cost and how to reduce the amount of gypsum adhering to the paper piece to zero, and still remain the gypsum. We have been eagerly searching through trial and error to see if it can be separated from paper pieces and scattered. As a result, in the treatment facility, the process such as the baking process is not required and the paper piece can be separated and simplified, while the paper piece to which the gypsum is attached is once returned to the pulp in water and processed to remove the remaining attached gypsum. The gypsum that can be removed easily and inexpensively and remains without being removed can be made into a dihydrate gypsum form that is difficult to be pulverized, so that it can be embedded between the pulp fibers and sealed, and the gypsum remaining on the surface can be finely divided. Therefore, the present invention has been completed by conceiving that separation and scattering can be prevented and that it becomes safe.

  The object of the present invention is to minimize the amount of gypsum adhering to a piece of paper when separating paper from waste gypsum board by a simple processing step and inexpensive apparatus without firing the gypsum board, A method and a manufacturing method for manufacturing a paper material that suppresses separation / scattering even if it remains, especially a paper material that can be used safely and securely by suppressing the scattering as dust and can be recycled. To provide an apparatus.

  Another object of the present invention is to provide a production method and a production apparatus capable of producing a paper material having the above-mentioned object and further having improved deodorizing property at low cost.

  Still another object of the present invention is to use a paper material manufactured by the above manufacturing method and manufacturing apparatus as an animal bedding, and the attached gypsum does not scatter and become dust during use in a livestock bedding. Another object of the present invention is to provide an animal litter that can absorb livestock manure and use it as a raw material for methane fermentation to increase the methane production rate.

The manufacturing method of the paper material which used the paper piece isolate | separated from the waste gypsum board of the 1st aspect of this invention as a raw material includes the following processes (a)-(f), It is characterized by the above-mentioned.
(A) a crushing step of crushing waste gypsum board into a predetermined shape or size;
(B) a paper piece collecting step for separating and collecting a paper piece from the crushed material;
(C) an underwater agitation / crushing step for producing a pulp liquid in which the paper pieces are put into water and kneaded to disperse and suspend the plant tissue in water;
(D) a pulp recovery step for recovering pulp by separating gypsum and water from the pulp liquid;
(E) a paper material forming step for forming the pulp into a predetermined shape;
(F) A drying step of drying the paper material at a predetermined temperature.

The manufacturing method of the paper material which used the paper piece isolate | separated from the waste gypsum board of the 2nd aspect of this invention as a raw material includes the following (a ')-(f') processes, It is characterized by the above-mentioned.
(A ′) a crushing step of crushing waste gypsum board into a predetermined shape or size;
(B ′) a paper piece collecting step for separating and collecting a paper piece from the crushed material;
(C ′) an underwater agitation / crushing step for producing a pulp liquid in which the paper pieces are put into water and kneaded to disperse and suspend the plant tissue in water;
(C′-1) a charcoal mixing step of further mixing a predetermined amount of charcoal into the pulp liquid (d ′) a pulp recovery step of separating the gypsum, water and residual charcoal from the pulp liquid and recovering the pulp;
(E ′) a paper material forming step for forming the pulp into a paper material having a predetermined shape;
(F ′) A drying step of drying the paper material at a predetermined temperature.

  The method for producing a paper material using a paper piece separated from the waste gypsum board of the third aspect of the present invention as a raw material is a method for producing a paper material using a paper piece separated from the waste gypsum board of the first or second aspect as a raw material. The drying step is characterized by drying at less than 128 ° C., preferably at 100 to 127 ° C.

  According to a fourth aspect of the present invention, there is provided a method for producing a paper material using a piece of paper separated from a waste gypsum board as a raw material. In the mixing step, charcoal is mixed in an amount of 10 to 30% by weight with respect to 100% by weight of the paper material.

  The paper material manufacturing method using the paper piece separated from the waste gypsum board of the fifth aspect of the present invention as a raw material is the paper material using the paper piece separated from the waste gypsum board of any of the first to fourth aspects as a raw material. In the manufacturing method, in the forming step, the pulp is formed into a molded body or processed product having a predetermined shape.

The paper material manufacturing apparatus according to the sixth aspect of the present invention is:
Crushing means for crushing waste gypsum board into a predetermined shape or size;
A paper piece collecting means for separating and collecting the paper pieces from the crushed material;
An underwater agitation / crushing means for producing a pulp liquid in which the paper pieces are put into water and dissolved to disperse and suspend the plant tissue in water,
A pulp recovery means for separating and recovering the pulp by separating gypsum and water contained in the pulp liquid;
Paper material molding means for molding the pulp into a predetermined shape;
Drying means for drying the paper material at a predetermined temperature;
It is provided with.

The paper material manufacturing apparatus according to the seventh aspect of the present invention is:
Crushing means for crushing waste gypsum board into a predetermined shape or size;
A paper piece collecting means for separating and collecting the paper pieces from the crushed material;
An underwater agitation / crushing means for producing a pulp liquid in which the paper pieces are put into water and dissolved to disperse and suspend the plant tissue in water,
Charcoal mixing means for further mixing a predetermined amount of charcoal into the pulp liquid;
Pulp recovery means for recovering pulp by separating gypsum, water and residual charcoal contained in the pulp liquid;
Paper material forming means for forming the pulp into a predetermined shape paper material,
Drying means for drying the paper material at a predetermined temperature;
It is provided with.

  The paper material according to the eighth aspect of the present invention is a paper material manufactured by the manufacturing method according to any one of the first to fifth aspects, and is formed of a molded body or a molded product having a predetermined shape. Is 0.075 mm to 1.5 mm dihydrate gypsum, and the gypsum fine powder generation rate is 1% by weight or less.

  The animal litter of the ninth aspect of the present invention is characterized in that the paper material of the eighth aspect is used for an animal litter.

According to the method for producing a paper material using a piece of paper separated from the waste gypsum board of the first aspect of the present invention as a raw material, the waste gypsum board is not fired at the time of processing, so compared with the method of firing the waste gypsum board of the prior art. Thus, the parting process that eliminates the need for the baking process is simplified, and a piece of paper can be separated from the waste gypsum board at a low cost, and the amount of gypsum adhering from this piece of paper can be recycled to a paper material with minimal to zero.
Moreover, even if gypsum remains in the paper material, separation and scattering of gypsum can be suppressed during use, and in particular, dust can be prevented from scattering.

  Furthermore, the amount of gypsum adhering to the paper can be minimized to zero, and even if gypsum remains attached, the paper material does not scatter, so it can be used in a wide range of applications, such as various raw materials such as recycled paper, buffer Can be used safely and safely on materials. In particular, when used as an animal covering material, in addition to safety and security, it can absorb livestock manure and use it as a raw material for methane fermentation to increase the methane production rate.

  According to the method for producing a paper material using a piece of paper separated from the waste gypsum board of the second aspect of the present invention as a raw material, a paper material having a further improved deodorizing property can be produced in the paper material of the first aspect.

According to the method for producing a paper material using a piece of paper separated from the waste gypsum board of the third aspect of the present invention as a raw material, the paper material is dried at less than 128 ° C., so that the dihydrate gypsum is maintained and pulverized. Can be prevented.
Dihydrate gypsum has the property that it is difficult to be pulverized. Moreover, the sterilization effect is also acquired by drying at 100 to 127 degreeC.

  According to the method for producing a paper material using a piece of paper separated from the waste gypsum board of the fourth aspect of the present invention as a raw material, the deodorizing property can be enhanced.

  According to the fifth aspect of the present invention, according to the method for producing a paper material using a piece of paper separated from the waste gypsum board as a raw material, the pulp is formed or processed into a predetermined shape, and is adapted and adapted to various uses. Can be. In these molded products or processed products, if the shape has a minimum surface area, for example, a spherical body, most of the residual gypsum is attached to the paper fibers inside the paper and is blocked from the outside. Separation can be suppressed to the outside. Moreover, after making it spherical, it can also be made into a flat plate in which most of the remaining gypsum is fixed inside by crushing it into a flat plate shape. The shape that minimizes the surface area includes, for example, a lump (thing) body having at least one plane or curved surface in addition to the spherical body.

  According to the paper material manufacturing apparatus using the paper piece separated from the waste gypsum board of the sixth aspect of the present invention as a raw material, it comprises crushing, separation, stirring, molding and drying means (apparatus), all of which are extremely ordinary. Since these are general-purpose means (devices) and can be constituted by these general-purpose devices, they are less expensive than means (devices) employing a conventional heating (dry, steam, hot water, etc.) system.

  According to the paper material manufacturing apparatus using the paper piece separated from the waste gypsum board according to the seventh aspect of the present invention as a raw material, this manufacturing apparatus includes crushing, separation, stirring (charcoal mixing stirring), molding and drying means (apparatus). These are all ordinary general-purpose means (devices), and can be constituted by these general-purpose devices, so means (devices) adopting the conventional heating (dry, steam, hot water, etc.) system Compared to

The paper material of the eighth aspect of the present invention consists of a molded article or molded article having a predetermined shape, and the adhering gypsum is dihydrate gypsum having a particle size of 0.075 mm to 1.5 mm, so that the residual gypsum is separated. And can be prevented from scattering to the outside.
That is, when a three-dimensional shape with a small surface area, for example, a spherical body, is used, the residual gypsum is mostly attached to the paper fibers inside the paper and is cut off from the outside. , Will not be separated and scattered outside. Further, the adhered residual gypsum is dihydrate gypsum that does not easily become a fine powder, and is a fine particle having a particle size as small as 0.075 mm to 1.5 mm, so that it can be in a state of being embedded (embedded) between pulp fibers. Since the gypsum remaining on the surface is also difficult to be pulverized, separation and scattering can be prevented and it becomes safe. In addition, if a relatively large gypsum, for example, gypsum exceeding 1.5 mm remains, even dihydrate gypsum is easily crushed by external force during use, and if crushed, fine powder is likely to be generated. On the other hand, if the particle size is about 1 mm, an external force is unlikely to work during use, so that it is difficult to be crushed and fine powder is hardly generated. Therefore, the particle size of the adhered gypsum is preferably in the range of 0.075 mm to 1.5 mm, and is preferably set to −0.2 to +0.2 mm centering on 1.0 mm.
Moreover, since the generation rate of gypsum fine powder is 1% by weight or less, even if it is scattered, there is almost no damage.

  According to the animal litter of the ninth aspect of the present invention, when used in a livestock litter, the attached gypsum does not pulverize and scatter and absorbs livestock manure to promote methane fermentation and increase the methane production rate. Can be made.

It is the block process figure which showed the manufacturing process of the paper material which used the paper piece isolate | separated from the waste gypsum board which concerns on Embodiment 1 of this invention as a raw material. It is the graph which showed the measurement result of the amount of fine powder gypsum generated from paper. It is the block process figure which showed the manufacturing process of the paper material which used the paper piece isolate | separated from the waste gypsum board which concerns on Embodiment 2 of this invention as a raw material. FIG. 4 shows the measurement result of the odor level generated from the paper material, FIG. 4A is a graph showing the change over time when the amount of ammonia (odor source) dropped is small, and FIG. 4B shows the change over time when the amount of dripping is large. It is a graph.

  Hereinafter, with reference to drawings, the manufacturing method and manufacturing apparatus of the paper material which used the paper piece isolate | separated from the waste gypsum board which concerns on embodiment of this invention as a raw material, and the animal bedding are demonstrated. However, the embodiment shown below exemplifies a paper material manufacturing method and manufacturing apparatus using animal pieces separated from waste gypsum board for embodying the technical idea of the present invention, and animal bedding. It is not intended to limit the invention to this, but is equally applicable to other embodiments within the scope of the claims.

[Embodiment 1]
With reference to FIG. 1, the manufacturing method and manufacturing apparatus of the paper material which used the paper piece isolate | separated from the waste gypsum board which concerns on Embodiment 1 as a raw material are demonstrated. FIG. 1 is a block process diagram showing a paper material manufacturing process using a paper piece separated from the waste gypsum board according to the first embodiment as a raw material.

The manufacturing method A of the paper material which uses the paper piece isolate | separated from the waste gypsum board which concerns on Embodiment 1 of this invention as a raw material includes the following process (a)-(f).
(A) a crushing step of crushing waste gypsum board into a predetermined shape or size;
(B) a paper piece collection step for separating and collecting a paper piece from the crushed material,
(C) an underwater agitation / crushing step for producing a pulp liquid in which the paper pieces are put into water and kneaded to disperse and suspend the plant tissue in water;
(D) a pulp recovery step of recovering pulp by separating gypsum and water from the pulp liquid;
(E) a paper material forming step for forming the pulp into a predetermined shape;
(F) A drying step of drying the paper material at a predetermined temperature.

  According to this manufacturing method, the waste gypsum board is not fired at the time of processing. Therefore, compared to the method of firing the waste gypsum board of the prior art, the process that eliminates the firing process is simplified, and the waste gypsum board is simplified. It is possible to easily and inexpensively regenerate and manufacture a paper material in which the amount of gypsum attached is minimized to zero. In addition, this processing apparatus, that is, a manufacturing apparatus is composed of crushing, separation, stirring, molding, and drying means (apparatus), all of which are ordinary and general-purpose means (apparatus). Since it can be configured, it is less expensive than means (apparatus) employing a conventional heating (dry, steam, hot water, etc.) method.

Furthermore, even if gypsum remains on the paper material, separation and scattering of the gypsum can be suppressed, and in particular, dust can be prevented from being scattered and thus safe. Further, the price of the produced paper material is low because the raw material is waste material, the manufacturing method is simple, and the installation cost of the manufacturing apparatus can be reduced.
Furthermore, since the amount of gypsum adhering to the paper becomes very small or zero, the paper material can be used for a wide range of applications, for example, various raw materials such as recycled paper, buffer materials and the like. In particular, when it is used as an animal covering material, it can be used as a raw material for methane fermentation in which livestock manure is absorbed, and the methane production rate can be increased.

  Hereinafter, each process of said (a)-(f) and the manufacturing apparatus which implements this process are demonstrated. Other features will be clarified in the following description.

(A) Waste gypsum board crushing process a. Waste gypsum board The waste gypsum board has the same configuration as the virgin gypsum board. That is, it has a configuration in which baked gypsum is the main raw material, sawdust, pearlite, foamed material, etc. are mixed, kneaded with water to form a paste, poured between two base papers, and hardened into a plate shape. The two base papers are coated with an adhesive on the inner surface facing each other, and the base paper and the gypsum are bonded together by this adhesive.

The calcined gypsum (CaSO ₄ .2H ₂ O) as a main raw material has the property of absorbing water of crystallization and exothermic hardening when it is added to become gypsum (CaSO ₄ .1 / 2H ₂ O). Transition temperature between _them, CaSO 4 · _2H 2 O and CaSO ₄ · 1 / 2H ₂ O between between 128 ° C., also CaSO ₄ · 1 / 2H ₂ O and CaSO ₄ has a 163 ° C..

  The two base papers consist of a front paper on the front side of the board and a back paper on the back side, and these have the property that they do not adhere to gypsum and do not wavy due to the wetting and drying processes, and more than ordinary paper Also used are papers that increase water resistance and strength when wet. Each color is white, cream, blue, etc. for the front paper, and the paper is bleached pulp, high-quality waste paper, etc., and for the back paper, high-quality waste paper is used. ing. The adhesive is generally a vinyl acetate type thermoplastic resin.

(B) Sorting (excluding items containing hazardous materials)
The waste gypsum board collected and carried in is often miscellaneous and has unknown features. In particular, if there is something that contains hazardous materials, exclude it. The waste gypsum board that has been excluded will be properly treated separately.

C) Crushing In the treatment facility, after confirming and removing foreign substances, the waste material is first shredded into a predetermined shape or size using a shredder. The crushing at this time is a size such that one side has a predetermined length, for example, 10 mm, and crushes until the base paper on both sides and the gypsum sandwiched therebetween are separated. The total amount of gypsum separated by this primary crushing is, for example, less than 2 mm, and the gypsum is adhered to the paper piece by an adhesive.

  After primary crushing, it is separated into gypsum and paper pieces with a predetermined sieve mesh, for example, a 5 mm mesh vibrating sieve, and the recovered granular gypsum is recycled separately. The crushing means (apparatus) used in this step uses a known crushing apparatus, for example, a board crusher. Many of these exist as general-purpose devices and are well-known, so detailed description thereof will be omitted.

(B) Paper piece collection step The crushed material crushed in the previous step is sieved and separated into gypsum and paper pieces and classified. For example, the crushed material is separated into gypsum and a piece of paper (partially gypsum is adhered) with a predetermined sieve mesh, for example, a vibrating sieve having a mesh size of 5 mm. When gypsum is still attached to the paper pieces after the separation, the gypsum adhering by secondarily crushing with a roller crusher or the like is mechanically separated. By this crushing, the gypsum is separated from the bonded portion. The separated paper piece is conveyed to the next process, and the gypsum is processed separately. A well-known thing is used for the separation and classification means (apparatus) in this separation process. Many of these exist as general-purpose devices and are well-known, so detailed description thereof will be omitted.

(C) Underwater agitation / crushing process A piece of paper is put into water and stirred using a stirring bar such as a screw, and the paper piece is crushed to produce a pulp liquid in which the plant tissue of the piece of paper is dispersed and suspended in water. To do. By the generation of this pulp liquid, the gypsum adhering to the paper piece is made fine and easily separated. That is, when the piece of paper is disaggregated to the pulp liquid, the paper fiber pulp becomes bent and bent in water, and the plaster adheres to the pinned point on this loose paper fiber, in other words, the part where the plaster can adhere is a fiber. The adhesion area becomes small at the pinpoint on the surface, and as a result, the gypsum is easily peeled off and easily separated. When the particle diameter exceeds 1.5 mm, even dihydrate gypsum is easily crushed by external force during use, and fine powder is generated when crushed. On the other hand, if the particle size is about 1 mm, an external force is unlikely to work during use, so that it is difficult to be crushed and fine powder is hardly generated. The gypsum particle size to be refined is in the range of 0.075 mm to 1.5 mm, and of these, −0.2 to +0.2 mm is preferable centering on 1.0 mm.
By this step, the pulp becomes fibrous, and the gypsum adhering to the paper piece is washed away. However, the amount of gypsum that remains without being washed away is very small, but it sinks between pulp fibers and is firmly fixed between the fibers by molding and drying in the subsequent process, so separation and scattering can be suppressed. . In other words, the remaining gypsum is in a dihydrate gypsum state that is difficult to be pulverized and is embedded and sealed between the pulp fibers by molding and drying, so that it can be prevented from separating and scattering during use. Moreover, since the gypsum adhering to the surface is also difficult to be pulverized, the generation rate of gypsum fine powder can be extremely low regardless of the amount of gypsum remaining. The fine powder generation rate is preferably 1% by weight or less with respect to 100% by weight of the paper material, for example.

  The term “pulp” means cellulose from plant paper, and “pulp liquid” means paper fiber suspended in water. It is also called “disaggregation” to disperse the paper pieces and disperse and suspend the plant tissue of the paper pieces in water. A well-known thing is used for the stirring means (apparatus) used at this process. Many of these exist as general-purpose devices and are well-known, so detailed description thereof will be omitted.

  Moreover, it may replace with the stirring apparatus by a screw and may use a high-pressure-pressure water washing machine. By using this high water pressure washer, gypsum adhering to a piece of paper can be made substantially zero. In addition, the high water pressure water washing machine is already known, and this is used.

  Moreover, in this process, although the paper piece was processed without heating, you may heat-process. That is, after the separated paper piece is heated to 120 to 150 °, it is stirred in water to form a pulp. Thereby, the remaining gypsum can be decreased. In this case, the remaining gypsum absorbs moisture and becomes dihydrate gypsum again, so that it can be prevented from being pulverized and scattered during use.

(D) Pulp recovery process A pulp liquid is sieved, a gypsum content is removed, paper piece pulp is isolate | separated and collect | recovered.

(E) Paper material forming step In this step, the pulp is formed into a shape suitable for and adapted to the application. In other words, the pulp is made into a molded body or processed product having a predetermined shape, and is adapted and adapted to various uses. For example, it is formed into a block shape, a sheet shape, a pellet shape or a flake shape. These are molded using respective molds.
By this step, most of the gypsum remaining on the paper piece is embedded in the molded body during molding, and the amount exposed on the surface of the molded body is further reduced. As a result, the gypsum embedded in the molded body can be prevented from scattering to the outside. In other words, the remaining gypsum is in a dihydrate gypsum state that is difficult to be pulverized and is embedded and sealed between the pulp fibers by molding and drying, so that it can be prevented from separating and scattering during use. In addition, since the gypsum attached to the surface is also difficult to be pulverized, the generation rate of gypsum fine powder can be extremely low regardless of the amount of gypsum remaining. As a result, it becomes a recycled paper material that suppresses the remaining adhering gypsum from being pulverized and scattered.
In these molded products or processed products, if the shape has a minimum surface area, for example, a spherical body, most of the residual gypsum is attached to the paper fibers inside the paper and is blocked from the outside. Separation can be suppressed to the outside. Moreover, after making it spherical, it can also be made into a flat plate in which most of the remaining gypsum is fixed inside by crushing it into a flat plate shape. The shape that minimizes the surface area includes, for example, a lump (thing) body having at least one plane or curved surface in addition to the spherical body.

  Further, by reducing the apparent surface area, more residual gypsum can be fixed inside, and the deodorizing effect is improved. Moreover, as described above, a flat plate in which a large amount of residual gypsum is fixed can be created by shaping it into a spherical shape and then crushing it into a flat plate shape. What is important here is that, regardless of the amount of gypsum remaining, the occurrence rate of fine gypsum that separates and scatters gypsum from paper is reduced during use. The fine gypsum generation rate is preferably 1% by weight or less with respect to 100% by weight of the paper material. Since the molding machine used in this step can be performed using a known machine, detailed description thereof is omitted.

(F) Drying process The molded object thru | or the molded article shape | molded by the previous process are dried by heating, ventilation, etc. below transition temperature (128 degreeC). In this case, what is important is that if heating is performed at 128 ° C. or higher, the gypsum becomes hemihydrate gypsum and is easily pulverized. That is, when it is dried at less than 128 ° C., dihydrate gypsum is retained, so that fine powdering can be prevented well. Moreover, when it drys in the range of 100 to 127 degreeC, the sterilization effect is also acquired. As the drying means (apparatus) used in this step, a known general-purpose one can be used, and detailed description thereof is omitted.

  The paper material manufactured through the above steps (a) to (f) is separated or scattered even if the amount of gypsum adhering to the piece of paper becomes extremely small or zero and remains (regardless of the amount). In particular, it is possible to suppress scattering as dust. In other words, the fine gypsum generation rate is preferably 1% by weight (1% by weight with respect to 100% by weight of the paper material) or less.

  The paper material manufacturing method A includes the steps (a) to (f), but the paper material forming step (e) may be omitted. That is, the pulp recovered in the pulp recovery step (d) may be dehydrated in the drying step (f) to obtain a paper material having a predetermined shape. The manufacturing equipment is the same. Alternatively, the molded body formed in the paper material forming step (e) may be cut after the drying step (f) to obtain a processed product (paper piece) having a predetermined shape or size. For example, a sheet-like material is cut into pieces of a predetermined shape and size.

  From the above description, it is clear that the manufacturing method and the manufacturing apparatus have the characteristics described above. Hereinafter, this point will be supplemented, and the manufactured paper material will be described.

  This manufacturing method consists of the steps of crushing, separation, stirring, molding and drying, whereas the prior art is a manufacturing method consisting of steps such as firing, heating (paper carbonization) and pressurized wet heating of waste gypsum board. From the comparison between the two, this manufacturing method is simplified, and since there is no firing step, there is no need for running costs such as fuel costs, and further, crushing, separation, stirring, molding, and drying that constitute the processing apparatus. All of these devices can use general-purpose devices, so the processing steps (devices) are simplified and inexpensive, and the waste gypsum board is incinerated or buried without recycling, ensuring commercial profitability. Can do.

  Also, according to this manufacturing method, the piece of paper on which gypsum is attached can be easily removed by returning it to the pulp once in water, and the remaining gypsum that remains without being removed is submerged between the pulp fibers and molded. So there is no separation and scattering. Moreover, since this manufacturing method processes with a dihydrate gypsum as it is, gypsum does not fly, and it can shape | mold into the shaping paper material of arbitrary shapes. The pulp becomes fibrous, so that the gypsum adhering to the piece of paper is washed away.

However, the gypsum that has not been washed off still sinks between the pulp fibers, although it is a very small amount, and is firmly fixed between the fibers by molding and drying in the next process. Suppressing, especially scattering as dust can be suppressed. As a result, the manufactured paper material can be used safely and safely because gypsum can be prevented from being scattered as dust during use.
Further, when the paper material is dried at less than 128 ° C., the dihydrate gypsum is maintained, so that fine pulverization can be satisfactorily prevented. In particular, when it is dried in the range of 100 ° C. to 127 ° C., a sterilizing effect can be obtained.

The paper material produced by the above production method and production apparatus is a molded body or molded product having a predetermined shape, and the adhering gypsum is dihydrate gypsum having a particle size of 0.075 mm to 1.5 mm. Can be separated and scattered outside. That is, when a three-dimensional shape with a small surface area, for example, a spherical body, is used, the residual gypsum is mostly attached to the paper fibers inside the paper and is cut off from the outside. , Will not be separated and scattered outside. Moreover, since the adhered gypsum is dihydrate gypsum that does not easily become fine powder, and the particle size is as small as 0.075 mm to 1.5 mm, it can be in a state of being buried (embedded) and sealed between pulp fibers. The gypsum remaining on the surface is also difficult to pulverize, so that separation and scattering can be prevented and it is safe. In addition, if a relatively large gypsum, for example, gypsum exceeding 1.5 mm remains, even dihydrate gypsum is easily crushed by external force during use, and if crushed, fine powder is likely to be generated. On the other hand, if the particle size is about 1 mm, an external force is unlikely to work during use, so that it is difficult to be crushed and fine powder is hardly generated. Therefore, the particle size of the adhered gypsum is preferably in the range of 0.075 mm to 1.5 mm, and is preferably set to −0.2 to +0.2 mm centering on 1.0 mm.
Moreover, since the generation rate of gypsum fine powder is 1% by weight or less, even if it is scattered, there is almost no damage.
Since it has the above characteristics, it can be used safely and safely for a wide range of applications, for example, various raw materials such as recycled paper, and buffer materials. Hereinafter, the example used for the animal bedding in it is demonstrated.

  When this paper material is used for a litter such as livestock, the following remarkable effects are obtained. First, the remaining gypsum does not scatter as dust during use in the bedding. Moreover, if livestock manure is absorbed, it will become a raw material of methane fermentation, and a methane production rate can be raised. Moreover, since the amount of gypsum attached to the paper material used for the bedding is extremely small or zero, it does not adversely affect livestock. Even if gypsum remains, the amount is extremely small, and it is dihydrate gypsum that is difficult to be pulverized, and most of the gypsum is attached to the paper fibers inside the paper and is blocked from the outside. Therefore, it does not separate and scatter.

  Further, since the paper material is made in the form of pulp, a gap is formed between the paper fibers, and this space becomes a water retaining space, which increases water absorption and increases the diffusion rate. Moreover, the contact area with air increases and evaporation is promoted. Furthermore, the water of manure that contacts the paper is absorbed by the paper and quickly diffuses along the fibers.

  Furthermore, when the amount of manure is relatively small, the diffused water has a large contact area with the air, so that the evaporation rate of odorous components such as ammonia in the water is increased. However, since the total amount is small, it diffuses and dilutes before the problematic odor level. On the other hand, if the amount of manure is relatively large, it is stored inside the shaped paper. In this case, the contact area between the internal moisture and air is reduced, and the evaporation rate of odor components such as ammonia is also reduced. As a result, the amount of odor components released into the atmosphere in a short time is suppressed, and the odor level does not increase. These points are confirmed by the experimental results shown in Table 2 and FIG.

  In addition, the paper that maintains the paper shape, such as crushing the paper of the prior art by dry method, stores a lot of moisture on the surface, so the contact area with the air becomes large, the evaporation rate increases, and the moisture It becomes easy to scatter. For this reason, especially when manure containing bedding is processed, the bedding is agitated, the contact area with the air increases at once, moisture on the surface splashes, odorous components such as ammonia volatilize, and the working environment deteriorates. . On the other hand, even if this paper material is agitated, the contact area with air does not increase abruptly, and it is difficult for the paper to form droplets. Therefore, the volatilization of odorous components such as ammonia does not increase, and the working environment deteriorates. do not do.

  In the past, methane fermentation was carried out using raw material in which livestock manure was absorbed in sawdust. In this case, however, there was a problem that methane production efficiency could not be increased. By making it, methane production efficiency can be increased. From the above, it is possible to provide a bedding that is cheaper and easier to use than the present sawdust, and can improve the methane generation efficiency of methane fermentation by using manure mixed with this bedding. Moreover, since sawdust and waste paper are currently tight, they can be replaced.

[Experimental Examples 1 and 2]
Next, the effects of the paper material manufactured by the manufacturing method of Embodiment 1 were confirmed by Experimental Examples 1 and 2. First, waste gypsum board is crushed, water is added to a piece of paper with gypsum attached by separating paper with a side of 5 mm or more as paper, and then stirred and disaggregated with a screw, and then filtered through a wire mesh with an opening width of 2 mm. The obtained pulp was further rinsed with water to remove gypsum, and then placed in a mold and dried at 110 ° C. The dried paper material was cut to prepare a 10 mm square paper material as Sample 1 of Experimental Example 1. The paper material of Experimental Example 1 is put in a container, shaken with a shaking tester, and screened three times every hour (3 hours in total), with a 200-mesh sieve, the weight of ingredients on the sieve and the ingredients passing through the sieve The weight of the generated gypsum fine powder was measured by measuring the weight of each.

  Similarly, the paper piece before the water washing process was heated at 150 degreeC for 2 hours, and the 10 square mm paper as a comparative sample of Experimental example 2 was created. The comparative sample of Experimental Example 2 was shaken in the same manner as in Experimental Example 1, and the weight of the generated gypsum fine powder was measured. The results are summarized in Table 1 and FIG. In addition, the pulverization occurrence rate in the shaking test of Table 1 and FIG. 2 is an alternative to the rate at which gypsum adhering to the paper material becomes fine powder when the paper material is used for bedding and stepped on a cow or the like. Corresponds to the value.

From the results shown in Table 1 and FIG. That is, as shown by the solid line in FIG. 2, the paper material of Sample 1 starts to be used before the experiment (before using the paper material, for example, as a laying material), and 3 times per hour (within 3 hours). The occurrence rate of fine powder (gypsum) changes from about 0.3% to 0.2%, 0.1%, and 0.2% at first, and all values are 0.3% or less at the beginning. On the other hand, as shown by the dotted line in FIG. 2, in the paper material of the comparative sample, the fine powder generation rate started from 0.5% and changed to 1.1%, 0.9%, and 0.7%. The highest value has reached 1.1%. These values indicate the generation rate of fine powder (gypsum) during use of the sample (paper material).
From this result, the paper material (sample 1) of the present embodiment has a smaller generation rate of fine powder (gypsum) in use than the paper material of the comparative sample (prior art), and can be used safely and securely. In particular, as described above, particularly when used as a bedding, there is a remarkable effect. The deodorizing effect will be described later.

[Embodiment 2]
A second embodiment of the present invention will be described with reference to FIG. FIG. 3 is a block process diagram showing a manufacturing process of a paper material using a paper piece separated from the waste gypsum board according to Embodiment 2 of the present invention as a raw material.

The manufacturing method B of the paper material which used the paper piece isolate | separated from the waste gypsum board which concerns on Embodiment 2 of this invention as a raw material includes the following (a ')-(f') processes.
(A ′) crushing step of crushing waste gypsum board into a predetermined shape or size;
(B ′) a paper piece collection step for separating and collecting a paper piece from the crushed material;
(C ′) an underwater agitation / crushing step for producing a pulp liquid in which the paper pieces are put into water and kneaded to disperse and suspend the plant tissue in water;
(C′-1) a charcoal mixing step of further mixing a predetermined amount of charcoal into the pulp liquid;
(D ′) a pulp recovery step of separating the gypsum, water and residual charcoal from the pulp liquid and recovering the pulp;
(E ′) a paper material forming step for forming the pulp into a paper material having a predetermined shape;
(F ′) A drying step of drying the paper material at a predetermined temperature.

  In this manufacturing method, among the steps (a ′) to (f ′) and the manufacturing apparatus that performs the steps, the steps (a ′) to (c ′) and (e ′) to (f ′) The process is the same as each process of (a)-(c) and (e)-(f) of the manufacturing method of Embodiment 1. Therefore, in the same process, only a different process will be described while avoiding redundant description.

(C′-1) In the agitation and crushing step in water, a charcoal mixing step in which charcoal is further mixed In this step, a predetermined amount of charcoal is mixed and stirred. The type of charcoal is not limited and any charcoal (known) can be used. Each charcoal can be attracted by the charcoal used. Moreover, if sludge charcoal is used, it can be made inexpensive. The amount of charcoal to be mixed is in the range of 10 to 30% by weight with respect to 100% by weight of the paper material. If the amount is less than 10%, it is difficult to obtain a deodorizing effect, and if it exceeds 30%, the color of the paper material becomes charcoal and looks bad. On the other hand, when used as a litter, the raw material for methane fermentation It becomes difficult to do. The mixing amount of 10 to 30% by weight is a range with respect to 100% by weight of the paper material, that is, the amount mixed in the paper material of the final product.
Although charcoal is mixed in this step, it may be mixed in the previous step (c ′). When mixed in the previous process, the carbonaceous material is agitated and crushed in the previous process to obtain a desired size.

  The deodorizing property can be further improved by mixing this range of charcoal. In addition, in the methane fermentation using livestock manure mixed with this litter, it becomes a place where microorganisms live, contributes to the growth of microorganisms, and improves and stabilizes methane production efficiency. '-1) may be integrated into the submerged stirring and crushing step of the previous step (c). That is, charcoal mixing may be added to the separated paper pieces.

(D ') The pulp recovery process which isolate | separates the gypsum and water and residual charcoal which are contained in a pulp liquid, and collect | recovers pulp This process isolate | separates the gypsum and water and the residual charcoal which are contained in a pulp liquid, and collects pulp It is.

  According to the manufacturing method of this Embodiment 2, the effect of the paper material manufactured with the manufacturing method of Embodiment 1 is show | played, and also the deodorizing property of a paper material can be improved. That is, since the waste gypsum board is not fired at the time of processing even in the manufacturing method of the second embodiment, compared to the method of firing the waste gypsum board of the prior art, the fractional process that eliminates the firing process is simplified. It is possible to easily and inexpensively manufacture a paper material in which a piece of paper is easily separated and the amount of gypsum attached is minimized to zero.

  Moreover, this manufacturing apparatus consists of crushing, separation, agitation, molding and drying means (apparatus), and these are all ordinary general-purpose means (apparatus), and can be constituted by these general-purpose apparatuses. Compared to means (apparatus) adopting a conventional heating (dry, steam, hot water, etc.) method, the cost is reduced. Furthermore, even if it remains on the paper material, separation / scattering can be suppressed, and in particular, scattering as dust can be suppressed. Furthermore, since the amount of gypsum adhering to the paper can be minimized to zero, the paper material can be used for a wide range of applications, for example, various raw materials such as recycled paper, buffer materials, and the like. In particular, when it is used as an animal covering material, it can be used as a raw material for methane fermentation in which livestock manure is absorbed, and the methane production rate can be increased.

  According to the manufacturing method of Embodiment 2, in addition to these effects, the deodorizing property can be further improved. In other words, charcoal generally adsorbs only a small amount of ammonia, which is the main odor component, but moisture (feces and urine water) containing the odor component can be stored in the charcoal, and the apparent surface area (stored) Since the contact area between moisture and air or moisture outside the charcoal is small, the amount of evaporation of odorous components from the accumulated moisture is relatively small, and the effect is superior to the molded paper. In addition, since the water absorption rate of charcoal is relatively slow, it is effective to use it together with paper.

  That is, since the paper material manufactured in Embodiment 2 carries charcoal inside the paper, the paper quickly absorbs moisture containing an odor component, and then slowly absorbs it into charcoal. And the deodorizing property can be improved. Although the effect does not last, bedding such as cattle is not a problem because the use rotation is fast.

  The bedding and charcoal can be prepared separately and mixed. However, if charcoal is carried inside the paper, there is no concern that the charcoal and bedding will be separated due to movement of the cow, etc. Since it is easy to absorb, the effect is also easily obtained. Although charcoal serves as a place for microorganisms during methane fermentation and contributes to the improvement and stabilization of methane production efficiency due to the growth of microorganisms, it does not become a raw material for direct methane fermentation, so the upper limit of the amount added is limited by 30%. Is done. From the above, it is possible to provide a rug that is cheaper and easier to use than the present sawdust, and the methane generation efficiency of methane fermentation is improved by using manure mixed with this rug.

[Experimental Examples 3 to 8]
Next, the effect of the paper material manufactured by the manufacturing method of the said Embodiment 2 was confirmed by Experimental Examples 3-8. First, waste gypsum board is crushed, and a piece of paper with a side of 5 mm or more is separated into paper. Water is added to the piece of paper to which gypsum adheres, and the mixture is stirred and disintegrated with a squeeze to make sludge charcoal 100% by weight. On the other hand, 10% by weight (Experimental Examples 3 to 5: Table 2 Samples 1 to 3) mixed or not mixed (Experimental Examples 6 to 8: Table 2 Samples 4 to 6), and then filtered through a wire mesh with an opening width of 2 mm. The pulp was further rinsed with water to remove the gypsum and then molded into a mold and dried at 110 ° C. The dried paper material was cut to prepare paper material samples of Experimental Examples 3 to 8 having a thickness of about 0.5 mm, 1 mm, and 2 mm and 10 mm square. 0.5 ml / g to 2 ml / g of ammonia water (odor source) was dropped on each of the paper material samples 1 to 6 of Experimental Examples 3 to 8, and the odor intensity after 1 minute and 5 minutes was measured. The measurement results are shown together in Table 2 and FIG.

From the results shown in Table 2 and FIG. That is, from the comparison between the paper materials of Sample 1 to Sample 3 (paper materials mixed with charcoal) and the paper materials of Sample 4 to Sample 6 (no charcoal), as shown in FIG. The odor level from 1 minute to 5 minutes after dropping of the ammonia water drops steeply down to the right with respect to any thickness of the paper material 0.5 mm, 1 mm or 2 mm. As for the odor level, the paper material (samples 1 to 3) mixed with charcoal has a lower odor level drop than the paper material (samples 4 to 6) without charcoal, and the deodorizing effect is improved. Also, as shown in FIG. 4B, when the amount of dripping is large, from the comparison of the paper material of Sample 1 to Sample 3 (paper material mixed with charcoal) and the paper material of Sample 4 to Sample 6 (no charcoal), It descends with a downward slope, and the gradient is gentler than when the amount of dripping is small (see FIG. 4A). Also in this case, the charcoal-containing paper material is good for the deodorizing effect.
As described above, from the comparison between the case where the amount of dripping is small and the case where the amount of dripping is large, the paper material with charcoal and no charcoal has a high deodorizing effect of the former, and the speed of the former is high and the latter is slightly slow. I found out that Note that some of these points have already been described in the paper material of the first embodiment.

[Experimental Example 9]
In Experimental Example 9, animal bedding was prepared using a paper material manufactured by the same manufacturing method as in Embodiment 1, and the degree of gypsum scattering was confirmed. That is, after crushing waste gypsum board, separating the paper with a side of 5 mm or more as paper, adding water to the piece of paper to which the gypsum was adhered, stirring and breaking with a screw, and then filtering through a wire mesh with an opening width of 2 mm The obtained pulp was further rinsed with water to remove gypsum, and then placed in a mold and dried at 110 ° C. The dried paper material was cut to prepare a 20 mm square paper material. The prepared paper material was mixed at a volume ratio of 1: 1 with the sawdust and spread in a barn as a litter. There was no gypsum scattering during the laying work.

A, B Paper Material Production Method (a), (a ′) Crushing Step (b), (b ′) Paper Piece Recovery Step (c), (c ′) Underwater Stirring / Crushing Step (d), (d ′) Pulp recovery process (e), (e ') Paper material forming process (f), (f') Drying process (c'-1) Charcoal mixing process

Claims (9)

The manufacturing method of the paper material which used the paper piece isolate | separated from the waste gypsum board characterized by including the process of (a)-(f) below.
(A) a crushing step of crushing waste gypsum board into a predetermined shape or size;
(B) a paper piece collecting step for separating and collecting a paper piece from the crushed material;
(C) an underwater agitation / crushing step for producing a pulp liquid in which the paper pieces are put into water and kneaded to disperse and suspend the plant tissue in water;
(D) a pulp recovery step for recovering pulp by separating gypsum and water from the pulp liquid;
(E) a paper material forming step for forming the pulp into a predetermined shape;
(F) A drying step of drying the paper material at a predetermined temperature. The manufacturing method of the paper material which used the paper piece isolate | separated from the waste gypsum board characterized by including the process of (a ')-(f') below.
(A ′) a crushing step of crushing waste gypsum board into a predetermined shape or size;
(B ′) a paper piece collecting step for separating and collecting a paper piece from the crushed material;
(C ′) an underwater agitation / crushing step for producing a pulp liquid in which the paper pieces are put into water and kneaded to disperse and suspend the plant tissue in water;
(C-1) Charcoal mixing step of further mixing a predetermined amount of charcoal into the pulp liquid (d ′) Pulp recovery step of separating the gypsum, water and residual charcoal from the pulp liquid and recovering the pulp;
(E ′) a paper material forming step for forming the pulp into a paper material having a predetermined shape;
(F ′) A drying step of drying the paper material at a predetermined temperature.   In the said drying process, it dries at less than 128 degreeC, Preferably it is 100-127 degreeC, The manufacturing method of the paper material which used the paper piece isolate | separated from the waste gypsum board of Claim 1 or 2 as a raw material.   The method for producing a paper material using a paper piece separated from waste gypsum board as a raw material according to claim 2, wherein the charcoal mixing step mixes 10 to 30% by weight of charcoal with respect to 100% by weight of the paper material. .   The method for producing a paper material using a piece of paper separated from waste gypsum board as a raw material according to any one of claims 1 to 4, wherein in the molding step, the pulp is formed into a molded body or molded product having a predetermined shape. . Crushing means for crushing waste gypsum board into a predetermined shape or size;
A paper piece collecting means for separating and collecting the paper pieces from the crushed material;
An underwater agitation / crushing means for producing a pulp liquid in which the paper pieces are put into water and dissolved to disperse and suspend the plant tissue in water,
A pulp recovery means for separating and recovering the pulp by separating gypsum and water contained in the pulp liquid;
Paper material molding means for molding the pulp into a predetermined shape;
Drying means for drying the paper material at a predetermined temperature;
A paper material manufacturing apparatus comprising: Crushing means for crushing waste gypsum board into a predetermined shape or size;
A paper piece collecting means for separating and collecting the paper pieces from the crushed material;
An underwater agitation / crushing means for producing a pulp liquid in which the paper pieces are put into water and dissolved to disperse and suspend the plant tissue in water,
Charcoal mixing means for further mixing a predetermined amount of charcoal into the pulp liquid;
Pulp recovery means for recovering pulp by separating gypsum, water and residual charcoal contained in the pulp liquid;
Paper material forming means for forming the pulp into a predetermined shape paper material,
Drying means for drying the paper material at a predetermined temperature;
A paper material manufacturing apparatus comprising:   The paper material manufactured by the manufacturing method according to any one of claims 1 to 5 comprises a molded body or processed product having a predetermined shape, and the adhering gypsum is dihydrate gypsum having a particle size of 0.075 mm to 1.5 mm. A paper material having a gypsum fine powder generation rate of 1% by weight or less.   An animal litter comprising the paper material of claim 8 as an animal litter.