JP4163899B2 - Recycled material, manufacturing method thereof, and inorganic board using the recycled material - Google Patents
Recycled material, manufacturing method thereof, and inorganic board using the recycled material Download PDFInfo
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- JP4163899B2 JP4163899B2 JP2002149526A JP2002149526A JP4163899B2 JP 4163899 B2 JP4163899 B2 JP 4163899B2 JP 2002149526 A JP2002149526 A JP 2002149526A JP 2002149526 A JP2002149526 A JP 2002149526A JP 4163899 B2 JP4163899 B2 JP 4163899B2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Description
【０００１】
【発明の属する技術分野】
この出願の発明は、再生材とその製造方法、およびその再生材を用いた無機質板に関するものである。さらに詳しくは、この出願の発明は、無機質板原料への配合量を増大することができ、マテリアルバランスを保つことができる再生材とその製造方法、およびその再生材を用いた無機質板に関するものである。
【０００２】
【従来の技術】
無機質板の製造過程において、また現場施工時においては、無機質板の端材や不良品等の廃材が大量に発生している。従来は、これらを産業廃棄物として処理していたが、最近では、資源枯渇、環境保護、およびコストの観点から、これらの廃材を原料として再利用する試みが種々検討されている。
【０００３】
この無機質板の再利用の方法としては、たとえば、無機質板の端材や不良品等の廃材を微細な粉末状に粉砕して再生材とし、原料に配合する方法が一般的に行われている。この方法では、得られる無機質板の強度低下の問題などから、再生材の配合量は最大でも２０％程度に抑えられている。
【０００４】
【発明が解決しようとする課題】
しかしながら、製造過程で発生するのに加え、現場から回収される無機質板の端材および不良品等の廃材の発生量を考慮すると、原料への再生材の配合量が３０％程度でないと、再生材量と再利用量とのマテリアルバランスがとれないのが現状である。
【０００５】
そこで、この出願の発明は、以上の通りの事情に鑑みてなされたものであり、従来技術の問題点を解消し、無機質板原料への配合量を増大することができ、マテリアルバランスを保つことができる再生材とその製造方法、およびその再生材を用いた無機質板を提供することを課題としている。
【０００６】
【課題を解決するための手段】
そこで、この出願の発明は、上記の課題を解決するものとして、以下の通りの発明を提供する。
【０００７】
すなわち、まず第１には、この出願の発明は、補強繊維としてパルプを使用している無機質板の廃材を粉砕した再生材であって、再生材に含まれるパルプのフリーネスが上記無機質板に配合されていた新品のパルプのフリーネスの５０％以上で、再生材に含まれる固形分の粒度が１００μｍ以下であることを特徴とする再生材を提供する。
【０００８】
そして、この出願の発明は、上記第１の発明について、第２には、再生材に含まれるパルプのアルカリ溶出量が、無機質板に配合されていたパルプのアルカリ溶出量の８０％以下であることを特徴とする再生材を、第３には、再生材のパルプの繊維分に固形分が付着しているとともに、固形分の付着量が、重量比として、パルプ：付着固形分＝５０：５０〜３０：７０であることを特徴とする再生材を、第４には、この再生材が１００メッシュのふるいにかけたときのふるい上残留分であることを特徴とする再生材を、第５には、この再生材が１００メッシュのふるいにかけたときのふるい通過分であることを特徴とする再生材を、第６には、無機質板の原料として、固形分重量で３０％以上の配合が可能とされる再生材を提供する。
【０００９】
そしてこの出願の発明は、第７には、補強繊維としてパルプを使用している無機質板の廃材を、無機質板に含まれるパルプのフリーネスが新品のパルプのフリーネスの５０％以上で、無機質板に含まれる固形分の粒度が１００μｍ以下となるように粉砕することを特徴とする再生材の製造方法を、第８には、ピンミル式の粉砕機により粉砕することを特徴とする再生材の製造方法を提供する。
【００１０】
加えてこの出願の発明は、第９には、上記いずれかに記載の再生材が原料として用いられていることを特徴とする無機質板を提供する。
【００１１】
【発明の実施の形態】
この出願の発明は、上記の通りの特徴を持つものであるが、以下にその実施の形態について説明する。
【００１２】
この出願の発明者らは、無機質板の端材および不良品等の廃材を用いた再生材の調整について鋭意研究を重ねた結果、「廃材の粉末化＝繊維も固形分も粉末状に粉砕」という従来の観念を拭い去り、廃材中の繊維をできるだけ痛めないように粉砕することで、この再生材を使用して得られる無機質板の強度や生産性への悪影響を低下し、再生材の配合量を３０％程度にまで引き上げられることを見出すに至った。
【００１３】
すなわち、この出願の発明の再生材は、無機質板の端材および不良品等の廃材を粉砕した再生材であって、無機質板に配合されていたパルプと、その他の固形分とに大分したとき、再生材に含まれるパルプのフリーネスが無機質板に配合されていたパルプ、すなわち、新品のパルプのフリーネスの５０％以上で、再生材に含まれる固形分の粒度が１００μｍ以下であることを特徴としている。
【００１４】
ここで、フリーネス（濾水度）とは、繊維の水切れの良さを示す指標であって、値が小さくなるほど繊維の粉砕が進んでいることを示す。そしてこの出願の発明においては、このフリーネスを再生材中のパルプの繊維長分布および比表面積の特性を評価する指標として用いるようにし、この再生材に含まれるパルプのフリーネスが無機質板に配合されていたパルプのフリーネスの５０％以上となるように粉砕することで、廃材中のパルプをできるだけ痛めないように粉砕するようにしている。
【００１５】
また、廃材の粉砕が十分でないと、再生材としての利用は困難となリ、この再生材を利用して製造した無機質板の強度等の特性を著しく低下させることになる。そこでこの出願の発明においては、上記のパルプのフリーネスとともに、再生材中の固形分の粒度が、１００μｍ以下であるように規定を設けている。
【００１６】
これによって、再生材としての利用が好適となり、再生材として無機質板の原料に配合した場合に、新品のパルプのみを用いた場合とほぼ同等の強度を発現させることができ、固形分は主原料として用いるセメント粒子の隙間を埋め、高強度で緻密な無機質板を得ることができるのである。
【００１７】
またこの出願の発明の再生材は、パルプのアルカリ溶出量が、新品のパルプのアルカリ溶出量の８０％以下に抑制されている。パルプから溶出するアルカリ成分はセメントの硬化反応を阻害することが知られているが、この再生材ではアルカリ溶出量が抑制されているため、セメントの硬化反応の進行を促進する効果が得られることになる。
【００１８】
また、以上のようなこの出願の発明の再生材は、パルプに固形分が付着しているとともに、固形分の付着量が、重量比として、パルプ：付着固形分＝５０：５０〜３０：７０の範囲のものとして実現される。再生材のパルプに固形分が付着した状態であるとともに、固形分の付着量を特定の範囲のものとすることで、この再生材を無機質板の原料に配合した場合に、繊維としての特性が十分発現されるとともに、パルプとセメントとの結合力が高められることになる。
【００１９】
さらにこの出願の発明の再生材においては、上記の再生材を１００メッシュのふるいにかけてふるい上残留分とふるい通過分とに分けることで、その各々を新たな再生材として利用することができる。このふるい上残留分は、主として固形分が付着したパルプからなり、新品のパルプと比較して同等以上の補強効果を示す。また、ふるい通過分については、主として固形分からなり、パルプが少ないことで、無機質板以外の異材、たとえば肥料、タイル、レンガ等へ応用することができ、再利用範囲を拡大することができる。
【００２０】
以上のような優れた特性を有するこの出願の発明の再生材は、無機質板の原料として、固形分重量で３０％もしくはそれ以上の配合が可能とされる。従来は、固形分重量として２０％を超える配合では、得られる無機質板の強度等の物性を著しく劣化させていたが、この出願の発明の再生材によって３０％程度の配合が可能となり、再生材量と再利用量とのマテリアルバランスをとることができる。
【００２１】
そしてこの再生材が原料として用いられている無機質板は、従来の再生材を用いたものよりも強度等の特性に優れ、また新品の材料のみを用いた無機質板にもひけを取ることはない。
【００２２】
以上のこの出願の発明の再生材は、無機質板の廃材を、無機質板に含まれるパルプのフリーネスが５０％以上で、無機質板に含まれる固形分の粒度が１００μｍ以下となるように粉砕することで製造することができる。
【００２３】
一般に、粉砕は、固体に圧縮（押す）、衝撃（たたく）、剪断（切る，折る）あるいは摩砕（擦る，すりつぶす）等の外力を与えて破壊し、元より粒径の小さな粒または粉にすることを言い、汎用されている粉砕機には、これらの外力を複合して粉砕を行うものが多い。そして、従来の再生材の製造においては、無機質板の廃材の粉砕装置としては、回転衝撃式粉砕ロータの中高速のものであって、圧縮および剪断力により粉砕するハンマーミルが広く用いられている。しかしながら、この出願の発明においては、上記のとおりの粉砕を行うために、衝撃および摩砕力による粉砕によって繊維が切断されるのを最小限に押さえ、かつ高い離解・分散効果が得られるピンミル式の粉砕機を用いることが好適な例として示される。このピンミル式の粉砕機によると、粉砕による温度上昇が少なく、粉砕品の粒度分布がシャープであって、粉砕粒度選択が容易になるという利点をも得ることができる。これによって、フリーネスドロップ（フリーネス値の低下）が抑制されるために、無機質板に含まれるパルプのフリーネスを無機質板に配合されていた、新品のパルプの５０％以上とすることができ、また固形分の粒度が１００μｍ以下となるように粉砕することができる。
【００２４】
以下、添付した図面に沿って実施例を示し、この出願の発明の実施の形態についてさらに詳しく説明する。
【００２５】
【実施例】
（実施例１〜３）
補強繊維としてパルプを使用している無機質板の製造過程で発生した端材を、ピンミル式粉砕機で粉砕して再生材を作製した。なお、この再生材の一部から繊維分を回収してフリーネスを測定したところ、新品のパルプのフリーネスの５０％以上であった。また、固形分については、平均粒径が１００μｍ以下で安定していることが確認された。
【００２６】
比較のために、従来の通り、ハンマーミル式粉砕機で粉砕して再生材を作製した。この場合の再生材の一部から繊維分を回収してフリーネスを測定したところ、新品のパルプのフリーネスの４０％以下であった。また、固形分については、平均粒径が１００μｍを超え、大きいものでは数ｍｍのものが含まれていた。
【００２７】
これらの再生材を原料中に０〜３０％配合してスラリーとし、抄造法により成形して脱水プレスにより加圧成形したのち、自然養生および１７０℃のオートクレーブ養生を行って無機質板を製造した。
【００２８】
これらの無機質板について、生産性、曲げ強度、耐久性を調べ、その結果を表１に示した。耐久性については、ＡＳＴＭ−Ｂ法による耐凍害性試験を行った後の、無機質板の膨潤度を調べることで評価した。
【００２９】
【表１】
従来の再生材を用いた場合には、再生材の配合量は２０％以下の場合に生産性および強度、耐久性の良い無機質板が得られるのに対し、この出願の発明の再生材を用いた場合には、配合量を３０％とした場合であっても生産性および強度、耐久性の良い無機質板を得ることができることがわかった。
（実施例４）
実施例１〜３と同様にピンミル式粉砕機で得られた再生材を１００メッシュのふるいにかけ、ふるい上に残った部分（以下、再生材繊維分という）を回収した。
【００３１】
この再生材繊維分と、新品のパルプのアルカリ成分の溶出度を調べ、その結果を図１に示した。この再生材繊維分のアルカリ溶出度は、新品のパルプの８０％以下であることが確認された。
【００３２】
これらの再生材繊維分と、新品のパルプとを用いて無機質板を作製したところ、新品のパルプを用いた場合に比べ、再生材繊維分を用いた場合の方が無機質板の硬化度合いが速いことが確認された。
【００３３】
また、再生材繊維分と新品のパルプとを用い、十分に硬化させて無機質板を作製して、その引張り強度を測定した。その結果を図２に示した。図２より、この出願の発明の再生材は、再生材繊維分だけを用いても、新品のパルプを用いたのと同等の引張り強度の向上効果が得られることが示された。
（実施例５）
実施例４で得られた再生材繊維分を熱分析し、その結果から繊維成分の重量とセメント等固形成分の重量とを算出して結果を表２に示した。
【００３４】
【表２】
この出願の発明の再生材における再生材繊維分には、繊維のみならず、固形分が付着するなどして含まれていることがわかった。
（実施例６）
実施例１〜３と同様にピンミル式粉砕機で得られた再生材を１００メッシュのふるいにかけ、ふるいを通過した部分（以下、再生材固形分という）を回収した。
【００３６】
この再生材固形分を用いて無機質板を作製し、引張り強度を測定した。その結果を図３に示した。
【００３７】
また、比較のために、従来の再生材を用いて同様に無機質板を作製し、引張り強度を測定した。
【００３８】
図３より、この出願の発明の再生材固形分を用いた無機質板は、配合量が４０％の場合であっても引張り強度が５ＭＰａ超過と、優れた強度向上効果を有することが示された。
【００３９】
もちろん、この出願の発明は上記に限定されるものではなく、細部については様々な態様が可能であることは言うまでもない。
【００４０】
【発明の効果】
以上詳しく説明した通り、この出願の発明によって、無機質板原料への配合量を増大することができ、マテリアルバランスを保つことができる再生材とその製造方法、およびその再生材を用いた無機質板が提供される。
【図面の簡単な説明】
【図１】再生材繊維分とパルプのアルカリ溶出度を例示した図である。
【図２】再生材繊維分とパルプを配合した無機質板の引張り強度を例示した図である。
【図３】再生材固形分と従来の再生材を配合した無機質板の引張り強度を例示した図である。[0001]
BACKGROUND OF THE INVENTION
The invention of this application relates to a recycled material, a manufacturing method thereof, and an inorganic plate using the recycled material. More specifically, the invention of this application relates to a recycled material that can increase the blending amount in the raw material of the inorganic plate and maintain the material balance, a manufacturing method thereof, and an inorganic plate using the recycled material. is there.
[0002]
[Prior art]
In the manufacturing process of the inorganic board and at the time of on-site construction, a large amount of waste materials such as scraps and defective products of the inorganic board are generated. Conventionally, these have been treated as industrial waste, but recently, various attempts have been made to reuse these waste materials as raw materials from the viewpoints of resource depletion, environmental protection, and cost.
[0003]
As a method of reusing this inorganic board, for example, a method is generally performed in which waste materials such as inorganic board scraps and defective products are pulverized into a fine powder to make a recycled material, which is then mixed with the raw material. . In this method, the blending amount of the recycled material is suppressed to about 20% at the maximum due to a problem of strength reduction of the obtained inorganic plate.
[0004]
[Problems to be solved by the invention]
However, in addition to the amount generated in the manufacturing process, considering the amount of scraps of inorganic plates recovered from the site and the amount of waste materials such as defective products, the amount of recycled material added to the raw material must be around 30%. At present, the material balance between the amount of material and the amount of reuse cannot be achieved.
[0005]
Therefore, the invention of this application has been made in view of the circumstances as described above, solves the problems of the prior art, can increase the blending amount to the inorganic board raw material, and keep the material balance. It is an object of the present invention to provide a recycled material that can be manufactured, a method for producing the same, and an inorganic plate using the recycled material.
[0006]
[Means for Solving the Problems]
Therefore, the invention of this application provides the following invention as a solution to the above-mentioned problems.
[0007]
That is, first the first invention of this application, compounding a recycled material obtained by grinding the scrap inorganic board using pulp, the freeness is the inorganic board of pulp contained in the recycled material as a reinforcing fiber in once was new more than 50% of the freeness of the pulp, solids particle size contained in the recycled material is to provide a recycled material, characterized in that at 100μm or less.
[0008]
The invention of this application relates to the first invention, and secondly , the alkali elution amount of the pulp contained in the recycled material is 80% or less of the alkali elution amount of the pulp mixed in the inorganic board. Thirdly, the recycled material is characterized in that the solid content adheres to the fiber content of the recycled material pulp , and the solid content adheres as a weight ratio of pulp : adhered solid content = 50: 50-30: the recycled material, which is a 70, the fourth, the recycled material, characterized in that the recycled material is sieve on residue when sieved 100 mesh, 5 to the recycled material, characterized in that the recycled material is sieve pass fraction when sieved 100 mesh, the sixth, as a raw material for inorganic board, more than 30% of the formulation by solids weight Providing possible recycled materials.
[0009]
According to the invention of this application, seventhly, the waste material of the inorganic board that uses pulp as the reinforcing fiber, the freeness of the pulp contained in the inorganic board is 50% or more of the freeness of the new pulp , and the inorganic board A method for producing a reclaimed material characterized by pulverizing the contained solids so as to have a particle size of 100 μm or less. Eighth, a method for producing a reclaimed material comprising pulverizing with a pin mill type pulverizer I will provide a.
[0010]
In addition, the invention of this application provides, in a ninth aspect, an inorganic board characterized in that any of the recycled materials described above is used as a raw material.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The invention of this application has the features as described above, and an embodiment thereof will be described below.
[0012]
The inventors of this application have conducted extensive research on the adjustment of recycled materials using scraps of inorganic plates and scraps such as defective products. As a result, “pulverization of waste materials = pulverization of fibers and solids into powder” By wiping away the conventional concept of `` grinding '' the fibers in the waste material as much as possible, the adverse effects on the strength and productivity of the inorganic board obtained using this recycled material are reduced, and the composition of recycled material is reduced. We have found that the amount can be increased to about 30%.
[0013]
That is, the recycled material of the invention of this application is a recycled material obtained by pulverizing waste materials such as scraps and defective products of an inorganic plate, and is largely divided into pulp mixed with the inorganic plate and other solid components. The pulp freeness contained in the recycled material is the pulp mixed with the inorganic board, that is, 50% or more of the freeness of the new pulp , and the solid content particle size contained in the recycled material is 100 μm or less. Yes.
[0014]
Here, freeness (degree of drainage) is an index indicating the goodness of water drainage of a fiber, and indicates that the fiber is more pulverized as the value decreases. And in the invention of this application, the freeness was used as the index for evaluating the properties of a fiber length distribution and specific surface area of the pulp in the recycled material, and freeness of the pulp contained in the recycled material has not been incorporated into inorganic board was by grinding so that 50% or more of the freeness of the pulp, so that grinding as much as possible damage the pulp in the waste material.
[0015]
Further, if the waste material is not sufficiently pulverized, it is difficult to use it as a recycled material, and the properties such as the strength of the inorganic board produced using the recycled material are significantly reduced. Therefore, in the invention of this application, with freeness of the pulp, solids particle size in the reproduction material is provided with a defined to be 100μm or less.
[0016]
This makes a suitable use as recycled material, when incorporated into the raw material of the inorganic board as recycled material, if and it is possible to substantially express the same intensity using only the new goods pulp, solids is primarily By filling the gaps between the cement particles used as the raw material, a high-strength and dense inorganic plate can be obtained.
[0017]
The recycled materials of the invention of this application, an alkali elution amount of pulp, is suppressed to 80% or less of the amount of alkali elution of new pulp. Alkali components eluted from the pulp are known to inhibit the hardening reaction of the cement, but this recycled material has the effect of accelerating the progress of the hardening reaction of the cement because the amount of alkali elution is suppressed. become.
[0018]
Further, in the recycled material of the invention of this application as described above, the solid content is adhered to the pulp, and the solid content is as follows: Pulp : Adhesive solid content = 50: 50 to 30:70 Realized as a range of When the solid content is attached to the recycled material pulp and the amount of the solid content is within a specific range, when this recycled material is blended with the raw material of the inorganic board, the properties as a fiber are It is fully expressed and the binding force between pulp and cement is enhanced.
[0019]
Furthermore, in the recycled material of the invention of this application, each of the recycled materials described above can be used as a new recycled material by dividing the recycled material into a residue on the sieve and a sieve passing portion through a sieve of 100 mesh. The residue on the sieve is mainly composed of pulp to which solid matter is adhered, and exhibits a reinforcing effect equal to or greater than that of a new pulp . Moreover, about a sieve passage part, it consists mainly of solid content, and since it has few pulps , it can apply to different materials other than an inorganic board, for example, a fertilizer, a tile, a brick, etc., and a reuse range can be expanded.
[0020]
The recycled material of the invention of the present application having the excellent characteristics as described above can be blended in an amount of 30% or more in terms of solid weight as a raw material for the inorganic plate. Conventionally, when the blending exceeds 20% as the solid content weight, the physical properties such as strength of the obtained inorganic plate have been remarkably deteriorated. However, the recycled material according to the invention of this application enables the blending of about 30%. A material balance between the amount and the amount of reuse can be achieved.
[0021]
And the inorganic board in which this recycled material is used as a raw material is superior in characteristics such as strength than those using the conventional recycled material, and does not sink on the inorganic board using only new materials. .
[0022]
The above recycled materials of the invention of this application, a waste of inorganic board, in the pulp contained in the inorganic board freeness of 50% or more, grinding so that the solid particle size contained in the inorganic board is 100μm or less Can be manufactured.
[0023]
In general, pulverization is performed by applying an external force such as compression (pushing), impact (tapping), shearing (cutting, folding), or grinding (rubbing, crushing) to a solid to break it down into particles or powder having a smaller particle size than the original. That is, many of the pulverizers that are widely used perform pulverization by combining these external forces. In the production of the recycled material in the related art, a hammer mill that pulverizes by compression and shear force is widely used as a pulverizer for waste material of inorganic plates, which is a medium-to-high-speed rotary impact pulverization rotor. . However, in the invention of this application, in order to perform the pulverization as described above, the pin mill type that minimizes the fiber being cut by the pulverization by impact and grinding force and obtains a high disaggregation / dispersion effect. It is shown as a preferable example that the pulverizer is used. According to this pin mill type pulverizer, it is possible to obtain an advantage that the temperature rise due to pulverization is small, the particle size distribution of the pulverized product is sharp, and the pulverized particle size can be easily selected. As a result, freeness drop (decrease in freeness value) is suppressed, so that the freeness of the pulp contained in the inorganic board can be 50% or more of the new pulp blended in the inorganic board. It can grind | pulverize so that the particle size of a minute may be 100 micrometers or less.
[0024]
Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings.
[0025]
【Example】
(Examples 1-3)
Recycled materials were produced by pulverizing mill ends generated in the process of manufacturing an inorganic board using pulp as reinforcing fibers with a pin mill type pulverizer. In addition, when fiber content was collect | recovered from this recycled material and freeness was measured, it was more than 50% of the freeness of a new pulp. Moreover, about solid content, it was confirmed that the average particle diameter is stable at 100 micrometers or less.
[0026]
For comparison, a recycled material was produced by pulverizing with a hammer mill type pulverizer as in the past. In this case, the fiber content was collected from a part of the recycled material and the freeness was measured to find that it was 40% or less of the freeness of a new pulp. Moreover, about solid content, the average particle diameter exceeded 100 micrometers, and the thing of several mm was contained in the big thing.
[0027]
These recycled materials were blended in a raw material in an amount of 0 to 30% to form a slurry, which was molded by a papermaking method and pressure-molded by a dehydrating press, and then subjected to natural curing and autoclave curing at 170 ° C. to produce an inorganic plate.
[0028]
These inorganic plates were examined for productivity, bending strength, and durability, and the results are shown in Table 1. Durability was evaluated by examining the degree of swelling of the inorganic plate after the frost damage resistance test by the ASTM-B method.
[0029]
[Table 1]
When conventional recycled materials are used, an inorganic plate with good productivity, strength, and durability can be obtained when the blended amount of recycled materials is 20% or less, whereas the recycled materials of the invention of this application are used. It was found that an inorganic plate having good productivity, strength and durability can be obtained even when the blending amount is 30%.
Example 4
The recycled material obtained by the pin mill type pulverizer was passed through a 100-mesh sieve in the same manner as in Examples 1 to 3, and the portion remaining on the sieve (hereinafter referred to as recycled material fiber) was recovered.
[0031]
The elution degree of this recycled material fiber and the alkali component of a new pulp was investigated, and the result is shown in FIG. It was confirmed that the alkali elution degree of this recycled material fiber was 80% or less of the new pulp.
[0032]
When an inorganic board was made using these recycled material fibers and new pulp, the degree of cure of the inorganic board was faster when recycled fibers were used than when using new pulp. It was confirmed.
[0033]
Further, the recycled fiber and the new pulp were sufficiently cured to produce an inorganic board, and the tensile strength was measured. The results are shown in FIG. From FIG. 2, it was shown that the recycled material of the invention of this application can obtain the same tensile strength improvement effect as that of using a new pulp even if only recycled fiber is used.
(Example 5)
The recycled material fibers obtained in Example 4 were subjected to thermal analysis, and the weight of the fiber component and the weight of the solid component such as cement were calculated from the results. The results are shown in Table 2.
[0034]
[Table 2]
It was found that the recycled material fiber content in the recycled material of the invention of this application contained not only fibers but also solid content.
(Example 6)
The recycled material obtained by the pin mill type pulverizer was passed through a 100 mesh sieve in the same manner as in Examples 1 to 3, and the portion that passed through the sieve (hereinafter referred to as recycled material solid content) was recovered.
[0036]
Using this recycled material solid content, an inorganic plate was prepared, and the tensile strength was measured. The results are shown in FIG.
[0037]
For comparison, an inorganic plate was similarly produced using a conventional recycled material, and the tensile strength was measured.
[0038]
From FIG. 3, it was shown that the inorganic plate using the recycled material solid content of the invention of this application has an excellent strength improvement effect with a tensile strength exceeding 5 MPa even when the blending amount is 40%. .
[0039]
Of course, the invention of this application is not limited to the above, and it goes without saying that various aspects are possible in detail.
[0040]
【The invention's effect】
As described above in detail, according to the invention of this application, a recycled material that can increase the blending amount into the inorganic plate raw material, can maintain the material balance, a manufacturing method thereof, and an inorganic plate using the recycled material are provided. Provided.
[Brief description of the drawings]
FIG. 1 is a diagram exemplifying recycled material fiber content and alkali elution degree of pulp.
FIG. 2 is a diagram illustrating the tensile strength of an inorganic board containing recycled fiber and pulp.
FIG. 3 is a diagram illustrating the tensile strength of an inorganic plate containing a recycled material solid content and a conventional recycled material.
Claims (9)
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| JP2002149526A JP4163899B2 (en) | 2002-05-23 | 2002-05-23 | Recycled material, manufacturing method thereof, and inorganic board using the recycled material |
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| JP2002149526A JP4163899B2 (en) | 2002-05-23 | 2002-05-23 | Recycled material, manufacturing method thereof, and inorganic board using the recycled material |
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|---|---|
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| JP4163899B2 true JP4163899B2 (en) | 2008-10-08 |
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