JPH09150179A - Production of packing material for waste water treatment of septic tank and the like - Google Patents
Production of packing material for waste water treatment of septic tank and the likeInfo
- Publication number
- JPH09150179A JPH09150179A JP7336065A JP33606595A JPH09150179A JP H09150179 A JPH09150179 A JP H09150179A JP 7336065 A JP7336065 A JP 7336065A JP 33606595 A JP33606595 A JP 33606595A JP H09150179 A JPH09150179 A JP H09150179A
- Authority
- JP
- Japan
- Prior art keywords
- speed
- shaped bodies
- nozzles
- linear bodies
- waste water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Immobilizing And Processing Of Enzymes And Microorganisms (AREA)
- Biological Treatment Of Waste Water (AREA)
Abstract
Description
【０００１】[0001]
【発明の技術分野】本発明は、浄化槽などに充填され
て、廃水を自ら濾過したり、又は、廃水処理に有効な微
生物を付着させて、廃水を浄化するために供される浄化
槽等の廃水処理用充填材の製造方法に関する。TECHNICAL FIELD The present invention relates to a wastewater such as a septic tank which is filled in a septic tank or the like and is used for purifying the wastewater by filtering the wastewater by itself or adhering microorganisms effective for treating the wastewater. The present invention relates to a method for manufacturing a processing filler.
【０００２】[0002]
【従来の技術】従来、合成樹脂製の複数の線状体による
立体網状構造の周壁を有して、その内部を廃水が流れる
ようにした筒状の廃水処理用充填材が存在する。そし
て、このような充填材は、押出機の複数のノズルから溶
融状態の合成樹脂を下方へ向って連続的に押し出して線
状体を形成し、その下方位置で線状体をその落下速度よ
り遅い速度で引き取ることによって線状体を皺曲させ、
それら皺曲した線状体を互いに接触部をくっ付けるよう
に絡ませながら集合させて立体網状構造の周壁を形成
し、これを冷却固化するという方法で製造されている。2. Description of the Related Art Conventionally, there has been a cylindrical waste water treatment filler having a peripheral wall having a three-dimensional net structure composed of a plurality of linear bodies made of synthetic resin and allowing the waste water to flow through the interior wall. Then, such a filler continuously extrudes the molten synthetic resin downward from a plurality of nozzles of the extruder to form a linear body, and at the lower position thereof, the linear body is lowered from its dropping speed. Wrinkles the linear body by pulling it at a slow speed,
It is manufactured by a method in which these wrinkled linear bodies are assembled while entwining each other so that their contact portions are attached to each other to form a peripheral wall of a three-dimensional net-like structure, and this is cooled and solidified.
【０００３】しかしながら、このような構造の充填材
は、例えば浄化槽内に多数充填された場合に、圧力で潰
れて廃水が通過しにくくなり、浄化機能が損われるとい
う問題があった。また、このような充填材を浄化槽内に
多数設置した場合、各充填材を通過する廃水は、流速、
流量、汚水濃度等の差によって浄化度にばらつきが生じ
るので、各充填材を通過した廃水を貯留部に集めて混合
することにより浄化度を均一化する必要があり、廃水処
理効率が良くないという問題があった。However, when a large number of fillers having such a structure are filled in a septic tank, for example, there is a problem in that they are crushed by pressure and it becomes difficult for waste water to pass therethrough, impairing the purifying function. When a large number of such fillers are installed in the septic tank, the wastewater passing through each filler has a flow velocity,
Since the degree of purification varies depending on the difference in flow rate, sewage concentration, etc., it is necessary to collect the wastewater that has passed through each packing material in the storage part and mix it to make the degree of purification uniform, and the efficiency of wastewater treatment is not good. There was a problem.
【０００４】[0004]
【発明が解決しようとする課題】そこで本発明は、耐圧
性が向上して浄化槽などに多数充填しても圧力で潰れる
ことがなく、また、その内部を流れる廃水をその通過時
に隣接する充填材を流れる廃水と互いに混合させて廃水
の浄化度を均一化することのできる廃水処理用充填材
を、効率良く製造できる方法の提供を目的とする。SUMMARY OF THE INVENTION Therefore, according to the present invention, the pressure resistance is improved so that even if a large number of septic tanks or the like are filled, they are not crushed by pressure, and the waste water flowing inside the packing material is adjacent to the filling material. It is an object of the present invention to provide a method capable of efficiently producing a filler for treating wastewater, which can be mixed with the wastewater flowing through the tank to make the degree of purification of the wastewater uniform.
【０００５】[0005]
【課題を解決するための手段】上記の目的を達成するた
めに、本発明の浄化槽等の廃水処理用充填材の製造方法
は、複数の下向きノズル９を輪状に配置するとともに、
その輪の内側にも輪の複数箇所を結ぶ線上に複数の下向
きノズル９を配置した押出機８によって、熱可塑性合成
樹脂を加熱溶融してから、その溶融樹脂を上記の各ノズ
ル９から下方へ向って押し出すことにより複数の線状体
１を形成しながら連続的に落下させ、その下方に配した
変速機構１１付きの引取装置１０によって上記の各線状
体１をその落下速度より遅く引き取る工程と、その落下
速度と略同速度で引き取る工程とを組み合わせることに
よって、各線状体１が皺曲して互いに接触部をくっ付け
ながら絡み合って密に集合することにより立体網状構造
を呈する周壁２と中骨３の密壁部４，５を形成するとと
もに、各線状体１が略直線状に伸びて並ぶことにより上
記の密壁部４，５より空隙率の高い構造となる周壁２と
中骨３の疎壁部６，７も形成して、これらを冷却固化す
ることを特徴とするものである。In order to achieve the above object, in the method for producing a wastewater treatment filler such as a septic tank of the present invention, a plurality of downward nozzles 9 are arranged in a ring shape, and
The thermoplastic synthetic resin is heated and melted by an extruder 8 having a plurality of downward nozzles 9 arranged on a line connecting a plurality of points on the inside of the ring, and then the molten resin is moved downward from each of the nozzles 9 described above. A step of continuously dropping while forming a plurality of linear bodies 1 by extruding toward each other, and pulling each linear body 1 slower than its falling speed by a take-off device 10 with a speed change mechanism 11 arranged below the linear bodies 1. By combining the dropping speed and the step of pulling at substantially the same speed, the linear walls 1 are wrinkled, and the peripheral wall 2 presenting a three-dimensional net-like structure by entwining and tightly gathering while sticking the contact portions to each other is formed. The dense wall portions 4 and 5 of the bone 3 are formed, and the linear bodies 1 extend substantially linearly and are arranged side by side to form a structure having a higher porosity than the dense wall portions 4 and 5 described above. Sparse wall part 6 7 be formed, is characterized in that these cooling and solidifying.
【０００６】[0006]
【実施例】以下、本発明の実施例を図面に基づき説明す
る。まず、製造工程を示す図１において、符号８が押出
機であり、この押出機８はその下面に複数の下向きノズ
ル９を設けている。ノズル９は、図２に示すように、輪
状に配置するとともに、その輪の内側で、その輪の対向
する２点を結ぶ中心線上にも配置している。なお、この
輪の内側におけるノズル９の配置は自由であり、上記の
ように一直線状でも良いし、或は十字状、略Ｙ字状など
にすることも可能である。この押出機８にポリプロピレ
ン等の熱可塑性樹脂を入れて加熱溶融し、その溶融樹脂
を上記のノズル９から連続的に押し出して複数の線状体
１を形成し、それら線状体１をそのまま落下させる。Embodiments of the present invention will be described below with reference to the drawings. First, in FIG. 1 showing a manufacturing process, reference numeral 8 is an extruder, and the extruder 8 is provided with a plurality of downward nozzles 9 on its lower surface. As shown in FIG. 2, the nozzles 9 are arranged in a ring shape, and are also arranged inside the ring and on a center line connecting two points facing each other. It should be noted that the nozzle 9 can be arranged freely inside the ring, and may be in a straight line shape as described above, or may be in a cross shape or a substantially Y shape. A thermoplastic resin such as polypropylene is put into the extruder 8 and melted by heating, and the molten resin is continuously extruded from the nozzle 9 to form a plurality of linear bodies 1, and the linear bodies 1 are dropped as they are. Let
【０００７】これら落下する線状体１は、その下方に配
したローラを備えた引取装置１０によって引き取られ
る。この引取装置１０は、ローラの回転数を自由に変更
できる変速機構１１を備えている。引取装置１０による
線状体１の引取速度を、線状体１の落下速度より遅く設
定すると、各線状体１は皺曲して互いに接触部をくっ付
けながら絡み合って密に集合することにより立体網状構
造を呈し、周壁２の密壁部４と、中骨３の密壁部５が同
時に形成される。また、引取装置１０による線状体１の
引取速度を、線状体１の落下速度と略同速度に設定する
と、各線状体１は皺曲せずに略直線状に伸びて並んだ状
態となり、周壁２の疎壁部６と、中骨３の疎壁部７が同
時に形成される。なお、周壁２の密壁部４と疎壁部６
は、上記の押出機８における輪状に配置した複数のノズ
ル９から降りてくる線状体１によって形成され、又、中
骨３の密壁部５と疎壁部７は、上記の押出機８における
輪状に配置したノズル９の内側に一直線状に配した複数
のノズル９から降りてくる線状体１によって形成される
ものである。上記のように線状体１をその落下速度より
遅い速度で引き取る工程と、線状体１をその落下速度と
略同速度で引き取る工程とを組み合わせれば、密壁部４
と疎壁部６を有する周壁２と、同じく密壁部５と疎壁部
７を有する中骨３とが一体的に形成され、これらを冷却
水１２の中に浸漬して冷却固化したのち、引き上げて適
宜な長さに切断すれば、図３乃至図５に示すような廃水
処理用充填材を得ることができる。These falling linear bodies 1 are taken up by a take-up device 10 having a roller arranged below them. The take-up device 10 includes a speed change mechanism 11 that can freely change the number of rotations of the roller. When the take-up speed of the linear body 1 by the take-off device 10 is set to be slower than the falling speed of the linear body 1, the linear bodies 1 are wrinkled and are closely entwined with each other while sticking their contact portions together to form a solid body. It has a net-like structure, and the dense wall portion 4 of the peripheral wall 2 and the dense wall portion 5 of the middle bone 3 are simultaneously formed. Moreover, when the take-up speed of the linear body 1 by the take-up device 10 is set to be substantially the same as the falling speed of the linear body 1, the linear bodies 1 are arranged in a substantially straight line without wrinkling. The sparse wall portion 6 of the peripheral wall 2 and the sparse wall portion 7 of the middle rib 3 are simultaneously formed. The dense wall portion 4 and the sparse wall portion 6 of the peripheral wall 2
Is formed by the linear body 1 coming down from a plurality of nozzles 9 arranged in a ring shape in the extruder 8, and the dense wall portion 5 and the sparse wall portion 7 of the middle rib 3 are the extruder 8 described above. Is formed by the linear body 1 coming down from a plurality of nozzles 9 arranged in a straight line inside the nozzle 9 arranged in a ring shape. By combining the step of pulling the linear body 1 at a speed slower than the falling speed and the step of pulling the linear body 1 at substantially the same speed as the falling speed as described above, the dense wall portion 4
And the peripheral wall 2 having the sparse wall portion 6 and the mid bone 3 having the dense wall portion 5 and the sparse wall portion 7 are integrally formed, and after these are immersed in the cooling water 12 to be cooled and solidified, By pulling it up and cutting it to an appropriate length, it is possible to obtain a filler for wastewater treatment as shown in FIGS.
【０００８】上記の廃水処理用充填材は、横断面形状が
一直線状の中骨３を有しているが、図６に示すように中
骨３の横断面形状が十字状のものや、図７に示すように
中骨３の横断面形状が略Ｙ字状のものも、ノズル９の配
置を変えることによって上記と同様に製造することがで
きる。すなわち、押出機８のノズル９を輪状に配すると
ともに、その内側に複数のノズル９を十字状に配置すれ
ば、中骨３の横断面形状が十字状のもの、又、押出機８
のノズル９を輪状に配するとともに、その内側に複数の
ノズル９を略Ｙ字状に配置すれば、中骨３の横断面形状
が略Ｙ字状のものを製造することができる。[0008] The above-mentioned filler for treating wastewater has a cross-section having a straight middle rib 3, but as shown in FIG. As shown in FIG. 7, a cross-sectional shape of the inner rib 3 having a substantially Y shape can also be manufactured in the same manner as above by changing the arrangement of the nozzle 9. That is, when the nozzles 9 of the extruder 8 are arranged in a ring shape and a plurality of nozzles 9 are arranged inside thereof in a cross shape, the cross section shape of the inner rib 3 is a cross shape, and the extruder 8
By arranging the nozzles 9 in a ring shape and arranging the plurality of nozzles 9 in a substantially Y shape on the inner side thereof, it is possible to manufacture the middle rib 3 having a substantially Y-shaped cross section.
【０００９】本発明の製法によれば、上記のように、筒
状を呈してその中に廃水を流すことのできる周壁２と、
その周壁２の内部空間を複数に区画するように周壁２の
内面における複数箇所の間に架設した中骨３とを有し
て、その周壁２は、合成樹脂製の複数の線状体１が皺曲
して互いに接触部をくっ付けながら絡み合って密に集合
することにより立体網状構造を呈する密壁部４と、同じ
く合成樹脂製の複数の線状体１が略直線状に伸びて並ん
だ構造を有して上記の密壁部４よりも空隙率の高い疎壁
部６とから成り、また、中骨３も、周壁２の密壁部４と
対応する箇所に設けた同様な構造の密壁部５と、周壁２
の疎壁部６と対応する箇所に設けた同様な構造の疎壁部
７とから成る廃水処理充填材を、容易に効率良く製造す
ることができる。According to the manufacturing method of the present invention, as described above, the peripheral wall 2 having a tubular shape and capable of flowing the waste water therein,
The inner wall of the peripheral wall 2 is divided into a plurality of spaces, and the inner wall 3 of the inner wall of the peripheral wall 2 is erected between a plurality of positions. The peripheral wall 2 has a plurality of linear bodies 1 made of synthetic resin. A dense wall portion 4 having a three-dimensional net structure by wrinkling and being intertwined with each other while adhering the contact portions to each other and densely gathering, and a plurality of linear bodies 1 also made of synthetic resin are arranged in a substantially straight line. It has a structure and is composed of a sparse wall portion 6 having a higher porosity than the above-mentioned dense wall portion 4, and the middle rib 3 has a similar structure provided at a position corresponding to the dense wall portion 4 of the peripheral wall 2. Closed wall part 5 and peripheral wall 2
The wastewater treatment filler composed of the sparse wall portion 6 and the sparse wall portion 7 of the same structure provided at the corresponding position can be easily and efficiently manufactured.
【００１０】そして、これらの充填材は、中骨３を有し
て、その中骨３が周壁２を内側から支えるので、外側か
ら圧力を受けても周壁２が潰れる虞がなく、浄化槽など
に多数充填しても、それぞれが原形を維持して確実に浄
化機能を発揮できる。また、これらの充填材は疎壁部
６，７を有して、その疎壁部６，７を通って廃水が活発
に流出入するので、廃水の通過時に隣接する充填材間で
廃水が混合して浄化度が均一化する。さらに、これら充
填材は中骨３を有するので、単純な筒状のものに比べ、
廃水との接触面積が増えて廃水処理能力が向上する。Since these fillers have the inner ribs 3 and the inner ribs 3 support the peripheral wall 2 from the inside, there is no possibility that the peripheral wall 2 will be crushed even if pressure is applied from the outside, and the filler can be used in a septic tank or the like. Even if many are filled, each can maintain its original shape and reliably exert its purification function. In addition, since these fillers have the sparse wall portions 6 and 7, and the wastewater actively flows in and out through the sparse wall portions 6 and 7, when the wastewater passes, the wastewater is mixed between the adjacent fillers. Then, the degree of purification becomes uniform. Furthermore, since these fillers have the inner ribs 3, compared with the simple tubular ones,
The contact area with wastewater increases and the wastewater treatment capacity improves.
【００１１】[0011]
【発明の効果】本発明は上記の通りであり、耐圧性が向
上して浄化槽などに多数充填して外圧を受けても潰れず
浄化機能を確実に発揮でき、かつ、内部を流れる廃水の
流出入を活発にして廃水を混合することにより浄化度を
均一化して廃水処理効率を高めることができる充填材
を、容易に効率良く製造できるという効果がある。ま
た、本発明の製法は、押出機のノズルの配置を変えるこ
とにより、様々な形状の中骨を有する充填材を簡単に得
られるという効果がある。The present invention is as described above. The pressure resistance is improved, and a large number of septic tanks are filled with the septic tank without being crushed even when an external pressure is applied, so that the purifying function can be surely exhibited and the outflow of waste water flowing inside. There is an effect that it is possible to easily and efficiently manufacture a filler that can make the degree of purification uniform and increase the efficiency of wastewater treatment by actively activating the mixture and mixing the wastewater. In addition, the manufacturing method of the present invention has an effect that a filler having various shapes of inner ribs can be easily obtained by changing the arrangement of the nozzle of the extruder.
【図１】製造工程を示す断面図である。FIG. 1 is a cross-sectional view showing a manufacturing process.
【図２】押出機のノズルの配置図である。FIG. 2 is a layout view of nozzles of an extruder.
【図３】完成品の斜視図である。FIG. 3 is a perspective view of a completed product.
【図４】図３のＡ−Ａ線断面図である。FIG. 4 is a sectional view taken along line AA of FIG. 3;
【図５】図３のＢ−Ｂ線断面図である。FIG. 5 is a sectional view taken along line BB of FIG. 3;
【図６】完成品の斜視図である。FIG. 6 is a perspective view of a completed product.
【図７】完成品の斜視図である。FIG. 7 is a perspective view of a finished product.
１ 線状体 ２ 周壁 ３ 中骨 ４ 密壁部 ５ 密壁部 ６ 疎壁部 ７ 疎壁部 ８ 押出機 ９ ノズル １０ 引取装置 １１ 変速機構 １２ 冷却水 1 linear body 2 peripheral wall 3 medium bone 4 dense wall part 5 dense wall part 6 sparse wall part 7 sparse wall part 8 extruder 9 nozzle 10 take-up device 11 speed change mechanism 12 cooling water
Claims (1)
とともに、その輪の内側にも輪の複数箇所を結ぶ線上に
複数の下向きノズル９を配置した押出機８によって、熱
可塑性合成樹脂を加熱溶融してから、その溶融樹脂を上
記の各ノズル９から下方へ向って押し出すことにより複
数の線状体１を形成しながら連続的に落下させ、その下
方に配した変速機構１１付きの引取装置１０によって上
記の各線状体１をその落下速度より遅く引き取る工程
と、その落下速度と略同速度で引き取る工程とを組み合
わせることによって、各線状体１が皺曲して互いに接触
部をくっ付けながら絡み合って密に集合することにより
立体網状構造を呈する周壁２と中骨３の密壁部４，５を
形成するとともに、各線状体１が略直線状に伸びて並ぶ
ことにより上記の密壁部４，５より空隙率の高い構造と
なる周壁２と中骨３の疎壁部６，７も形成して、これら
を冷却固化することを特徴とする浄化槽等の廃水処理用
充填材の製造方法。1. A thermoplastic synthetic resin is heated by an extruder 8 in which a plurality of downward nozzles 9 are arranged in a ring shape and a plurality of downward nozzles 9 are arranged inside the ring along a line connecting a plurality of points of the ring. After being melted, the molten resin is extruded downward from each of the above nozzles 9 to continuously drop while forming a plurality of linear bodies 1, and a take-up device with a speed change mechanism 11 arranged below the linear bodies 1. By combining the step of pulling each of the linear bodies 1 slower than the falling speed thereof with 10 and the step of pulling the linear bodies 1 at substantially the same speed as the falling speed, each linear body 1 wrinkles and the contact portions are attached to each other. The dense wall portions 4 and 5 of the peripheral wall 2 and the mid bone 3 having a three-dimensional net-like structure are formed by being entangled and densely gathered, and the linear bodies 1 are extended substantially linearly and arranged side by side to form the dense wall described above. Manufacture of a filler for wastewater treatment such as a septic tank, characterized in that a peripheral wall 2 having a higher porosity than the parts 4, 5 and a sparse wall part 6, 7 of the middle rib 3 are also formed and cooled and solidified. Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7336065A JP3055086B2 (en) | 1995-11-30 | 1995-11-30 | Method for producing filler for wastewater treatment such as septic tanks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7336065A JP3055086B2 (en) | 1995-11-30 | 1995-11-30 | Method for producing filler for wastewater treatment such as septic tanks |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09150179A true JPH09150179A (en) | 1997-06-10 |
| JP3055086B2 JP3055086B2 (en) | 2000-06-19 |
Family
ID=18295337
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7336065A Expired - Fee Related JP3055086B2 (en) | 1995-11-30 | 1995-11-30 | Method for producing filler for wastewater treatment such as septic tanks |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3055086B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003010875A (en) * | 2001-07-02 | 2003-01-14 | Mitsubishi Rayon Co Ltd | Microorganism immobilized carrier |
| EP1316533A3 (en) * | 2001-12-03 | 2004-02-11 | Nisshinbo Industries, Inc. | Chemical-resistant bioreactor carrier, processes for producing the carrier and use of the carrier |
-
1995
- 1995-11-30 JP JP7336065A patent/JP3055086B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003010875A (en) * | 2001-07-02 | 2003-01-14 | Mitsubishi Rayon Co Ltd | Microorganism immobilized carrier |
| EP1316533A3 (en) * | 2001-12-03 | 2004-02-11 | Nisshinbo Industries, Inc. | Chemical-resistant bioreactor carrier, processes for producing the carrier and use of the carrier |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3055086B2 (en) | 2000-06-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1270787B1 (en) | Three-dimensional net-like structure, and method and device for producing three-dimensional net-like structure | |
| JPH11510120A (en) | Co-extruded blocks and their uses | |
| US8757996B2 (en) | Apparatus and method for manufacturing three-dimensional netted structure | |
| JP2024037772A (en) | Features on porous membrane | |
| RU98107642A (en) | METHOD FOR PRODUCING BIOLOGICAL DECOMPOSABLE FILTERING MATERIAL | |
| US3374300A (en) | Process and apparatus for the continuous production of polystyrenic foam materials | |
| CN101980759A (en) | Filter cartridge and a method for the production and use thereof | |
| JPH11241264A (en) | Three-dimensional netty structure and its production | |
| JPH09150179A (en) | Production of packing material for waste water treatment of septic tank and the like | |
| JP3025269U (en) | Filler for wastewater treatment such as septic tanks | |
| WO2011102262A1 (en) | Contact filter medium compact, production method therefor, and filtration device | |
| CN101977852B (en) | Process for producing shaped contact-filtration member, shaped contact-filtration member, filtration apparatus, and method of processing soiled water | |
| WO2017150740A1 (en) | Oil-adsorbent mat and production process therefor | |
| JP2001248054A (en) | Method for producing three-dimensional net-like body | |
| JP2733819B2 (en) | Filter media and method for producing the same | |
| JPS6044419B2 (en) | Continuous manufacturing method for three-dimensional reticular aggregates made of synthetic resin | |
| JPH0899093A (en) | Production of spherical three-dimensional reticulated aggregate | |
| JPH08206676A (en) | Filler for waste water treatment and manufacture thereof | |
| RU205127U1 (en) | Downhole filter | |
| JPH0742559Y2 (en) | Filler for wastewater treatment such as septic tanks | |
| JPH0742560Y2 (en) | Filler for wastewater treatment such as septic tanks | |
| JPH0711840Y2 (en) | Anaerobic treatment filter material | |
| JPH0133335B2 (en) | ||
| JP7497862B2 (en) | Bedding made of knitted resin network structure | |
| JPH0317667B2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100414 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130414 Year of fee payment: 13 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20140414 Year of fee payment: 14 |
|
| LAPS | Cancellation because of no payment of annual fees |