JPH0369868B2 - - Google Patents
Info
- Publication number
- JPH0369868B2 JPH0369868B2 JP58003261A JP326183A JPH0369868B2 JP H0369868 B2 JPH0369868 B2 JP H0369868B2 JP 58003261 A JP58003261 A JP 58003261A JP 326183 A JP326183 A JP 326183A JP H0369868 B2 JPH0369868 B2 JP H0369868B2
- Authority
- JP
- Japan
- Prior art keywords
- cement
- foamed plastic
- plastic particles
- particles
- hard film
- 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.)
- Expired - Lifetime
Links
- 239000002245 particle Substances 0.000 claims description 40
- 239000004033 plastic Substances 0.000 claims description 28
- 238000004519 manufacturing process Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 239000004566 building material Substances 0.000 claims description 5
- 229910010272 inorganic material Inorganic materials 0.000 claims description 5
- 239000011147 inorganic material Substances 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 2
- 239000004568 cement Substances 0.000 description 24
- 238000001125 extrusion Methods 0.000 description 13
- 239000000203 mixture Substances 0.000 description 11
- 239000003822 epoxy resin Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 229920000647 polyepoxide Polymers 0.000 description 7
- 239000000047 product Substances 0.000 description 7
- 239000002994 raw material Substances 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 229920006248 expandable polystyrene Polymers 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000004794 expanded polystyrene Substances 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- -1 polypropylene Polymers 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 238000001723 curing Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920000609 methyl cellulose Polymers 0.000 description 2
- 239000001923 methylcellulose Substances 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 229920002223 polystyrene Polymers 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 235000012438 extruded product Nutrition 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1018—Coating or impregnating with organic materials
- C04B20/1029—Macromolecular compounds
- C04B20/1037—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Porous Artificial Stone Or Porous Ceramic Products (AREA)
Description
【発明の詳細な説明】 本発明は建材の製造方法に関するものである。[Detailed description of the invention] The present invention relates to a method of manufacturing building materials.
無機質建材、例えばセメント系建築板の軽量
化、釘打ち性改良等のために、セメントに発泡プ
ラスチツク粒子、例えば発泡ポリスチレン粒子を
混合することが公知である（特許出願公告昭51−
16454号明細書、実用新案出願公告昭49−38092号
明細書）。 It is known to mix foamed plastic particles, such as foamed polystyrene particles, with cement in order to reduce the weight of inorganic building materials, such as cement-based building boards, and improve nailing properties (Patent Application Publication 1983-1983).
16454, Utility Model Application Publication No. 1983-38092).
而るに、かゝる建築板の製造には、従来、発泡
プラスチツク粒子を混合したセメントの含水混和
物を成形型内に充填し、これを加圧成形し、養生
脱型する方法が用いられている。しかしながら、
この製造方法においては、作業の連続化が困難で
あり、製造能率に劣るといつた不利がある。 However, conventionally, in the production of such building boards, a method has been used in which a water-containing mixture of cement mixed with foamed plastic particles is filled into a mold, the mixture is pressure-formed, and the mold is removed after curing. ing. however,
This manufacturing method has disadvantages such as difficulty in continuous operation and poor manufacturing efficiency.
ところで、セメント系建築板の連続製造方法と
して押出成形法が公知であり、上記発泡プラスチ
ツク粒子混合セメント板の製造に押出成形法を適
用できれば、上記製造能率の向上に有利である。 Incidentally, an extrusion molding method is known as a continuous manufacturing method for cement-based building boards, and if the extrusion molding method can be applied to the manufacturing of the foamed plastic particle-mixed cement board, it will be advantageous for improving the manufacturing efficiency.
しかしながら、セメントの押出成形の場合、そ
の成形圧力はセメント組成によつても異なるが10
〜30Kg／cm2と高圧であり、発泡プラスチツク粒子
を混合したセメント含水混和物をかかる高圧下で
押出成形すると、発泡プラスチツク粒子がその押
出圧力のために圧縮収縮してしまい、成形体がダ
イスから出るときに、成形体表面近傍の発泡プラ
スチツク粒子が圧縮から解放されて元の大きさに
膨張復元するときに、この粒子の膨張により成形
体の表面セメント層にクラツクが発生するといつ
た問題がある。従つて、発泡プラスチツク粒子を
混合したセメント含水混和物を押出成形しても、
良品質の建築板を得ることができない。 However, in the case of extrusion molding of cement, the molding pressure varies depending on the cement composition;
The pressure is as high as ~30Kg/ cm2 , and when a cement water-containing mixture mixed with foamed plastic particles is extruded under such high pressure, the foamed plastic particles compress and shrink due to the extrusion pressure, and the molded product falls out of the die. When the foamed plastic particles near the surface of the molded product are released from compression and expand and return to their original size, the expansion of these particles can cause cracks in the cement layer on the surface of the molded product. . Therefore, even if a cement water-containing mixture mixed with foamed plastic particles is extruded,
Unable to obtain good quality building boards.
本発明はかゝる点に鑑み、発泡プラスチツク粒
子を混合したセメント含水混和物の押出成形によ
つて上記クラツクの発生等のないセメント系建築
板の製造を可能にする方法を提供することにあ
る。 In view of the above, the present invention provides a method that makes it possible to manufacture cement-based building boards free from the above-mentioned cracks by extrusion molding a water-containing cement mixture mixed with foamed plastic particles. .
すなわち、本発明に係る建材の製造方法は、表
面に硬質膜を有する発泡プラスチツク粒子を水硬
性無機質材に混合し、該無機質材を水の存在下で
加圧成形することを特徴とする方法である。 That is, the method for producing a building material according to the present invention is a method characterized by mixing foamed plastic particles having a hard film on the surface with a hydraulic inorganic material, and press-molding the inorganic material in the presence of water. be.
本発明において、発泡プラスチツク粒子には発
泡倍率が10〜40倍、粒子径が0.1〜15mmの発泡ポ
リスチレン粒子を使用でき、硬質膜には発泡プラ
スチツク粒子よりもヤング率の大なるもの、例え
ば発泡プラスチツク粒子が発泡ポリスチレン粒子
の場合はエポキシ樹脂、セメント等を用いること
ができる。発泡プラスチツク粒子の表面に硬質膜
を形成する方法としては、発泡プラスチツク粒子
にスプレー法等により、フエノール樹脂−水ガラ
ス系、エチルシリケート−アルコール系、アルカ
リ土類−水ガラス系、エポキシ樹脂、セメント水
等を散布する方法を用い、これらを乾燥、熱処
理、その他の養生硬化を行い表面硬膜処理した発
泡プラスチツク粒子を用いることができる。 In the present invention, foamed polystyrene particles having an expansion ratio of 10 to 40 times and a particle diameter of 0.1 to 15 mm can be used as the foamed plastic particles, and the hard film can be made of foamed plastic particles having a larger Young's modulus than the foamed plastic particles, such as foamed plastic particles. When the particles are expanded polystyrene particles, epoxy resin, cement, etc. can be used. As a method for forming a hard film on the surface of foamed plastic particles, spraying on the foamed plastic particles can be performed using a phenol resin-water glass system, an ethyl silicate-alcohol system, an alkaline earth-water glass system, an epoxy resin, or a cement water system. Foamed plastic particles can be used which are surface hardened by drying, heat treatment, or other curing methods.
水硬性無機質材には、セメント、珪酸カルシウ
ム系原料、石膏、炭酸マグネシウム、炭酸カルシ
ウム等を主成分とする含水材料を用いることがで
き、石綿、ガラス繊維、有機合成繊維、例えばポ
リプロピレン繊維等の補強繊維、パルプ、メチル
セルローズ等の保型剤を必要に応じて添加でき
る。 As the hydraulic inorganic material, water-containing materials whose main components are cement, calcium silicate raw materials, gypsum, magnesium carbonate, calcium carbonate, etc. can be used, and reinforcements such as asbestos, glass fiber, organic synthetic fibers, such as polypropylene fibers, etc. can be used. A shape preserving agent such as fiber, pulp, methylcellulose, etc. can be added as necessary.
本発明を実施するには、表面に硬質膜を形成し
た発泡プラスチツク粒子をセメントに湿式ミキサ
ーにより混合し、発泡プラスチツク粒子混合セメ
ント含水原料を得る。次いで、この原料を押出機
に供給し、所定の断面形状で連続押出し、この押
出成形体を押出機に隣接して設けたベルトコンベ
ア上に移載していく。このベルトコンベア上にお
いて上記成形体を所定の長さに定尺切断し、この
切断片をベルトコンベアから取出し、これをオー
トクレーブ釜に搬入し、圧力２〜８気圧の飽和水
蒸気で養生、硬化を行い、これにて最終製品を得
る。上記押出成形時の圧力は10〜30Kg／cm2と高圧
であり、発泡プラスチツク粒子混合セメント含水
原料が特に押出ダイス内においてこの高圧力で加
圧されるが、該原料中の発泡プラスチツク粒子に
は硬質被膜が設けてあるから、この発泡プラスチ
ツク粒子の圧縮収縮をよく抑制できる。従つて、
それだけ、押出ダイス内での成形体の圧縮収縮を
軽減でき、この圧縮収縮との対応で生じるダイス
外での成形体の膨張復元歪を充分に小さくでき、
既述した成形体の表面セメント層のクラツク発生
を効果的に防止できる。 To carry out the present invention, foamed plastic particles having a hard film formed on their surfaces are mixed with cement using a wet mixer to obtain a hydrous raw material for cement mixed with foamed plastic particles. Next, this raw material is supplied to an extruder and continuously extruded in a predetermined cross-sectional shape, and the extruded product is transferred onto a belt conveyor provided adjacent to the extruder. The above-mentioned molded body is cut to a predetermined length on this belt conveyor, and the cut pieces are taken out from the belt conveyor and carried into an autoclave, where they are cured and cured in saturated steam at a pressure of 2 to 8 atmospheres. , to obtain the final product. The pressure during the above extrusion molding is as high as 10 to 30 kg/ cm2 , and the cement water-containing raw material mixed with foamed plastic particles is particularly pressurized at this high pressure in the extrusion die, but the foamed plastic particles in the raw material are Since the hard coating is provided, compression shrinkage of the foamed plastic particles can be well suppressed. Therefore,
This makes it possible to reduce the compression and contraction of the molded body inside the extrusion die, and to sufficiently reduce the expansion and restoring strain of the molded body outside the die that occurs in response to this compression and contraction.
The occurrence of cracks in the surface cement layer of the molded body described above can be effectively prevented.
次に、この発明の実施例を説明する。 Next, embodiments of the invention will be described.
発泡プラスチツク粒子として、発泡倍率が40
倍、粒子径が0.3〜1.0mmの発泡ポリスチレン粒子
の一次発泡粒子を空気中で24時間放置し発泡ガス
と空気とを置換して発泡倍率を15倍に抑制した発
泡プラスチツク粒子を用意し、該発泡ポリスチレ
ン粒子をミキサー内へ投入し、撹拌しながらエポ
キシ塗料をスプレーし、次いでセメントスラグを
少量づつ加えて表面に均一にまぶし、エポキシ樹
脂が硬化するまで撹拌を行い、表面に硬質膜を有
する発泡プラスチツク粒子を得た。 As expanded plastic particles, the expansion ratio is 40
Primary foamed polystyrene particles with a particle diameter of 0.3 to 1.0 mm are left in the air for 24 hours to replace the foaming gas with air to suppress the expansion ratio to 15 times. Put the foamed polystyrene particles into a mixer, spray the epoxy paint while stirring, then add cement slag little by little and sprinkle it evenly on the surface, stir until the epoxy resin hardens, and form the foam with a hard film on the surface. Plastic particles were obtained.
次に、セメント50重量％、珪砂44重量％、ポリ
プロピレン繊維0.2重量％、及びパルプ5.8重量％
からなるセメント配合物に外割で水を30重量％、
メチルセルロースを１重量％、さらに前記硬質膜
を有する発泡プラスチツク粒子を１重量％添加
し、混練機に供給して均一混合し、次いで100mm
φの押出成形機により圧力10Kg／cm2で押出成形し
厚さ20mm、幅100mm、長さ１ｍの板状体を成形し
た。 Next, 50% by weight of cement, 44% by weight of silica sand, 0.2% by weight of polypropylene fiber, and 5.8% by weight of pulp.
30% by weight of water in a cement mixture consisting of
Add 1% by weight of methylcellulose and 1% by weight of the foamed plastic particles having the hard film, feed the mixture to a kneader, mix uniformly, and then mix to 100 mm.
It was extruded using a φ extrusion molding machine at a pressure of 10 kg/cm 2 to form a plate-shaped body having a thickness of 20 mm, a width of 100 mm, and a length of 1 m.
該成形物の押出成形直後より２〜３分にわたり
表面の変化状態を観察したが、目視できる表面状
態の変化は全く無かつた。 Immediately after extrusion molding of the molded product, changes in the surface state were observed for 2 to 3 minutes, but there was no visible change in the surface state at all.
比較例として、硬質膜を有しない発泡ポリスチ
レン粒子を使用し、上記と同様にして押出成形を
行つたところ、成形物の押出成形直後より２〜３
分にわたり徐々に発泡ポリスチレン粒子が突出す
るのが観察され、５分後では表面にかなり凹凸が
生じ、これに起因するヘアークラツクの生じてい
るのが観察された。 As a comparative example, expanded polystyrene particles without a hard film were used and extrusion molding was performed in the same manner as above.
It was observed that the expanded polystyrene particles gradually protruded over a period of 5 minutes, and after 5 minutes, the surface was observed to be quite uneven, and hair cracks were observed to be caused by this.
次に、硬質膜の形成材料としてエポキシ樹脂の
みを使用し、ミキサーに投入して撹拌している発
泡プラスチツク粒子に該エポキシ樹脂を散布して
かき混ぜ、エポキシ樹脂が硬化するまで撹拌を続
けた。 Next, only an epoxy resin was used as the material for forming the hard film, and the epoxy resin was sprinkled onto the foamed plastic particles that were being stirred in a mixer and stirred, and the stirring was continued until the epoxy resin was cured.
硬質膜が生成されたポリスチレン粒子を先の実
施例と同様セメント配合物に添加混合し同様に押
出成形を行つた。 The polystyrene particles on which the hard film had been formed were added and mixed to a cement mixture in the same manner as in the previous example, and extrusion molding was carried out in the same manner.
成形品の表面状態についての観察を行つたが先
の実施例と同様な結果となつた。 The surface condition of the molded product was observed, and the results were similar to those in the previous example.
上記エポキシ樹脂に代え、カリウム、ナトリウ
ム、リチユウム等の水ガラス溶液を乾燥加熱撹拌
しながらスプレーすることにより、また、エチル
シリケート液を使用し硬質膜を有するポリスチレ
ン粒子を得、実施例と同様に押出成形を行つたが
成形体の表面状態はいずれもスプリングバツクに
起因するクラツクはなく平滑表面の製品が得られ
た。 Instead of the above epoxy resin, polystyrene particles with a hard film were obtained by spraying a water glass solution of potassium, sodium, lithium, etc. while drying and heating and stirring, and by using an ethyl silicate solution, and extruded in the same manner as in the example. Although molding was carried out, the surface condition of the molded products was free from any cracks due to spring back, and products with smooth surfaces were obtained.
上述した通り、本発明に係る建材の製造方法に
よれば、発泡プラスチツク粒子混合無機質板を、
連続成形法である押出法によりクラツク発生等の
支障なしに良好に製造でき、発泡プラスチツク粒
子混合セメント系板の製造能率の向上に極めて有
用である。 As described above, according to the method for producing building materials according to the present invention, the inorganic board mixed with foamed plastic particles is
The extrusion method, which is a continuous molding method, can be successfully manufactured without problems such as cracks, and is extremely useful for improving the manufacturing efficiency of cement-based boards mixed with foamed plastic particles.
Claims (1)
を水硬性無機質材に混合し、該無機質材を水の存
在下で加圧成形することを特徴とする建材の製造
方法。1. A method for producing a building material, which comprises mixing foamed plastic particles having a hard film on the surface with a hydraulic inorganic material, and pressure-molding the inorganic material in the presence of water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP326183A JPS59128260A (en) | 1983-01-11 | 1983-01-11 | Manufacture of construction material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP326183A JPS59128260A (en) | 1983-01-11 | 1983-01-11 | Manufacture of construction material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59128260A JPS59128260A (en) | 1984-07-24 |
| JPH0369868B2 true JPH0369868B2 (en) | 1991-11-05 |
Family
ID=11552522
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP326183A Granted JPS59128260A (en) | 1983-01-11 | 1983-01-11 | Manufacture of construction material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59128260A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50139817A (en) * | 1974-04-26 | 1975-11-08 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4715651U (en) * | 1971-03-25 | 1972-10-24 |
-
1983
- 1983-01-11 JP JP326183A patent/JPS59128260A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50139817A (en) * | 1974-04-26 | 1975-11-08 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59128260A (en) | 1984-07-24 |
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