JPS6325030B2 - - Google Patents
Info
- Publication number
- JPS6325030B2 JPS6325030B2 JP7968085A JP7968085A JPS6325030B2 JP S6325030 B2 JPS6325030 B2 JP S6325030B2 JP 7968085 A JP7968085 A JP 7968085A JP 7968085 A JP7968085 A JP 7968085A JP S6325030 B2 JPS6325030 B2 JP S6325030B2
- Authority
- JP
- Japan
- Prior art keywords
- maleic anhydride
- copolymer
- coating agent
- water
- maleimide
- 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
Links
- 239000011248 coating agent Substances 0.000 claims description 12
- 229920001577 copolymer Polymers 0.000 claims description 12
- 239000007864 aqueous solution Substances 0.000 claims description 8
- ZNZYKNKBJPZETN-WELNAUFTSA-N Dialdehyde 11678 Chemical compound N1C2=CC=CC=C2C2=C1[C@H](C[C@H](/C(=C/O)C(=O)OC)[C@@H](C=C)C=O)NCC2 ZNZYKNKBJPZETN-WELNAUFTSA-N 0.000 claims description 7
- 229920002873 Polyethylenimine Polymers 0.000 claims description 7
- 229920000642 polymer Polymers 0.000 claims description 7
- 150000001875 compounds Chemical class 0.000 claims description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 4
- LEQAOMBKQFMDFZ-UHFFFAOYSA-N glyoxal Chemical group O=CC=O LEQAOMBKQFMDFZ-UHFFFAOYSA-N 0.000 claims description 4
- 229910021529 ammonia Inorganic materials 0.000 claims description 2
- 229940015043 glyoxal Drugs 0.000 claims description 2
- PYSRRFNXTXNWCD-UHFFFAOYSA-N 3-(2-phenylethenyl)furan-2,5-dione Chemical compound O=C1OC(=O)C(C=CC=2C=CC=CC=2)=C1 PYSRRFNXTXNWCD-UHFFFAOYSA-N 0.000 claims 1
- SXRSQZLOMIGNAQ-UHFFFAOYSA-N Glutaraldehyde Chemical compound O=CCCCC=O SXRSQZLOMIGNAQ-UHFFFAOYSA-N 0.000 claims 1
- PEEHTFAAVSWFBL-UHFFFAOYSA-N Maleimide Chemical compound O=C1NC(=O)C=C1 PEEHTFAAVSWFBL-UHFFFAOYSA-N 0.000 claims 1
- WSMYVTOQOOLQHP-UHFFFAOYSA-N Malondialdehyde Chemical compound O=CCC=O WSMYVTOQOOLQHP-UHFFFAOYSA-N 0.000 claims 1
- 229920000147 Styrene maleic anhydride Polymers 0.000 claims 1
- PCSMJKASWLYICJ-UHFFFAOYSA-N Succinic aldehyde Chemical compound O=CCCC=O PCSMJKASWLYICJ-UHFFFAOYSA-N 0.000 claims 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims 1
- 229940118019 malondialdehyde Drugs 0.000 claims 1
- 239000010410 layer Substances 0.000 description 20
- 239000011347 resin Substances 0.000 description 10
- 229920005989 resin Polymers 0.000 description 10
- 238000005507 spraying Methods 0.000 description 9
- 239000000126 substance Substances 0.000 description 8
- 239000000243 solution Substances 0.000 description 7
- 239000006185 dispersion Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000001879 gelation Methods 0.000 description 5
- 239000007921 spray Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000003245 coal Substances 0.000 description 4
- 239000000839 emulsion Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000001035 drying Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000499 gel Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000003431 cross linking reagent Substances 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 229940079593 drug Drugs 0.000 description 2
- 229920000126 latex Polymers 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- SEFYJVFBMNOLBK-UHFFFAOYSA-N 2-[2-[2-(oxiran-2-ylmethoxy)ethoxy]ethoxymethyl]oxirane Chemical compound C1OC1COCCOCCOCC1CO1 SEFYJVFBMNOLBK-UHFFFAOYSA-N 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- VQTUBCCKSQIDNK-UHFFFAOYSA-N Isobutene Chemical group CC(C)=C VQTUBCCKSQIDNK-UHFFFAOYSA-N 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- AHVOFPQVUVXHNL-UHFFFAOYSA-N butyl prop-2-enoate;methyl 2-methylprop-2-enoate Chemical compound COC(=O)C(C)=C.CCCCOC(=O)C=C AHVOFPQVUVXHNL-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229920006026 co-polymeric resin Polymers 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000004816 latex Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 239000004846 water-soluble epoxy resin Substances 0.000 description 1
Description
〔産業上の利用分野〕
この発明は野積石炭、鉱石等の野積堆積物に固
結層を形成するためのコーテイング剤に関するも
のである。
〔従来の技術〕
水切りされた石炭や鉱石等はコンベアーで搬送
され、スタツカー等により屋外貯蔵ヤードに山積
貯蔵されるのが一般的である。これらの野積堆積
物は乾燥時には風により飛散して粉塵を発生する
ほか、降雨等により雨水が浸透し、含水率が上昇
する。
従来、野積堆積物の飛散、含水率上昇等を防止
するために、酢酸ビニル系樹脂、アクリル系樹
脂、ラテツクス等のエマルシヨンをコーテイング
剤として堆積物に散布し、乾燥させて固結層（コ
ーテイング剤が堆積物粒子を固結した層）を形成
させる方法が提案されている（特開昭49−31589
号）。
〔発明が解決しようとする問題点〕
しかしながら、従来のコーテイング剤はエマル
シヨンを使用しているため、散布後水分が乾燥し
ないと固結層が形成されない。この乾燥には、季
節、天候等によつて異なるが、通常１〜３日必要
であり、乾燥前に降雨があると、薬剤が流出して
しまい、固結層が形成できないため効果を発揮で
きない。特に雨水の浸透を抑制して含水率の上昇
を防止する場合は、雨期に固結層を形成する必要
があるが、雨のために薬剤の散布ができないとい
う問題点があつた。
この発明は上記問題点を解決するためのもの
で、硬化型の薬剤を使用することにより、散布後
迅速にゲル化し、その後降雨にあつても薬剤が流
出せず、効果的に固結層を形成することができる
野積堆積物のコーテイング剤を提供することを目
的としている。
〔問題点を解決するための手段〕
この発明は、イミド結合を有する高分子化合物
またはポリエチレンイミンの水溶液と水溶性ジア
ルデヒドとから成ることを特徴とする野積堆積物
のコーテイング剤である。
イミド結合
[Industrial Application Field] This invention relates to a coating agent for forming a consolidated layer on open deposits such as open coal and ore. [Prior Art] Drained coal, ore, etc. are generally conveyed by a conveyor and stored in piles in an outdoor storage yard using a stacker or the like. When these open deposits are dry, they are blown away by the wind and generate dust, and when it rains, rainwater seeps into them, increasing their moisture content. Conventionally, in order to prevent the scattering and increase in moisture content of open deposits, emulsions such as vinyl acetate resin, acrylic resin, latex, etc. were sprayed on the deposits as a coating agent, and dried to form a solidified layer (coating agent). A method has been proposed in which a layer of solidified sediment particles is formed (Japanese Patent Application Laid-Open No. 49-31589).
issue). [Problems to be Solved by the Invention] However, since the conventional coating agent uses an emulsion, a consolidated layer is not formed unless the moisture dries after being sprayed. This drying process usually takes 1 to 3 days, depending on the season and weather, and if it rains before drying, the chemical will wash out and a solidified layer will not form, making it ineffective. . Particularly in order to suppress the infiltration of rainwater and prevent an increase in water content, it is necessary to form a consolidated layer during the rainy season, but there was a problem in that the rain made it impossible to spray the chemicals. This invention is intended to solve the above-mentioned problems. By using a hardening type chemical, it quickly gels after being sprayed, and even if it rains afterwards, the chemical does not flow out, effectively forming a consolidated layer. The object is to provide a coating agent for field deposits that can be formed. [Means for Solving the Problems] The present invention is a coating agent for field deposits, which is characterized by comprising an aqueous solution of a polymer compound having an imide bond or polyethyleneimine, and a water-soluble dialdehyde. imide bond
本発明の野積堆積物のコーテイング剤の使用方
法は、各成分を別々にまたは混合状態で野積堆積
物に散布して固結層を形成する。好ましい使用方
法は樹脂成分を混合した溶液と、硬化剤および架
橋剤を混合した溶液を別々に散布するのが望まし
い。別々に散布する場合の散布順序および回数は
限定されない。散布する溶液の濃度は固形分２〜
10重量％程度が好ましい。
散布方法としては次のような方法があり、野積
層がぬれている場合でも散布可能である。
野積堆積物に対して堆積山表面１m2当り樹脂
分として25〜600ｇ、好ましくは50〜400ｇ散布
する。その際、散布機を用いて、堆積山の全表
面に対して均一に散布することができる。薬剤
の散布は各成分につき１回だけでよいが、複数
回行つてもよい。
填圧ローラまたは填圧板等を用いて堆積山表
面を加圧成形し、表面から約40cm程度の深さの
表層部の密度の平均（該表面部を複数等分する
各層からサンプリングした密度の平均という）。
を５〜30％上昇させたのち、その表面部にと
同様に散布する。
上記方法のうち、特にの方法が好ましい。
イミド結合を有する高分子化合物または（およ
び）ポリエチレンイミンの水溶液と水溶性ジアル
デヒドとを散布前に、または散布により混合する
と、これらが反応して３時間以内にゲル化し、さ
らに硬化が起こつて固結層が形成される。ゲル化
後は降雨があつても薬剤の流出はなく、固結層が
形成される。
イミド結合を有する高分子化合物およびポリエ
チレンイミンと水溶性ジアルデヒドとのゲル化機
構は下記〔〕または〔〕式によるものと推定
される。
コーテイング剤がイミド結合を有する高分子化
合物、ポリエチレンイミンおよび水溶性ジアルデ
ヒド以外の成分を含む場合は、他の成分を含んだ
状態でゲル化および硬化が起こり、ゲル状の網目
構造の内部に他の成分が分散した状態となる。従
つて常温造膜性の樹脂水分散体が含まれている場
合でも、樹脂水分散体はゲル状網目構造に覆われ
た状態で乾燥して造膜が行われるので、乾燥前に
降雨があつてもゲル化後であれば流出することは
ない。常温造膜性の樹脂水分散体とともに架橋剤
を使用する場合は、架橋とともにゲル化が行われ
るので、樹脂水分散体の流出はなく、さらに強固
な固結層が形成される。
固結層は風による飛散を防止するとともに、降
雨があつた場合の雨水の浸透を阻止して含水率の
上昇を防止することができる。特に常温造膜性の
樹脂水分散体を添加した場合は固結層の耐侯性が
優れ、長期間にわたつて均一な固結層を維持する
ことができる。
本発明の野積堆積物のコーテイング剤は水溶液
で使用できるため、溶剤による毒性や火災の恐れ
がなく、水による希釈、機器の洗浄が容易であ
り、しかも散布作業が簡単で広範囲に適用するこ
とができる。
〔発明の効果〕
本発明によれば、イミド結合を有する高分子化
合物またはポリエチレンイミンと水溶性ジアルデ
ヒドとにより固結層を形成するようにしたので、
散布後迅速にゲル化し、その後降雨があつても薬
剤が流出せず、野積堆積物に効果的に固結層を形
成することができ、これにより堆積物の飛散、含
水率上昇等を防止することができるとともに、散
布作業を容易かつ安全に行うことができるなどの
効果がある。
〔実施例〕
以下、本発明の実施例について説明する。
グーニエラ炭５トンを円錐状に堆積して石炭堆
積山を形成した。次いで第１表の液を２／m2
となるように均一に散布し、その30分後に第１表
の液を２／m2となるように散布した（ただし
比較例は液のみを散布した）。液を散布した
後、３時間後に降雨強度30mm／hrの人工降雨下に
堆積山を30分間曝した後、堆積山の表層状態を観
察するとともに、人工降雨後３日間自然乾燥して
固結層の有無を調べた。またこれらの堆積山を自
然放置して２カ月後の固結層の状態を調べた。結
果を第１表に併記する。
第１表の液、液は下記薬剤を表中の固形分
になるように水で希釈した溶液またはそのままの
溶液である。
Ａ：ポリエチレンイミン水溶液
Ｂ：グリオキザールの15重量％水溶液
Ｃ：アクリル酸ブチル−メタクリル酸メチル共重
合樹脂エマルシヨン
Ｄ：スチレン−ブタジエン共重合ゴムラテツクス
Ｅ：酢酸ビニル樹脂エマルシヨン
Ｆ：酸イミド共重合体水溶液（イソブチレン−無
水マレイン酸共重合体をアンモニア雰囲気の
もとで180℃に加熱し、イソブチレンマレイ
ン酸イミド−無水マレイン酸共重合体（モル
比３：２：１）を得、このイソブチレン−マ
レイン酸イミド−無水マレイン酸共重合体40
重量部、工業用25％アンモニア水７重量部、
および水80重量部を容器にとり、液温85℃に
加熱し、２時間撹拌して均一に溶解し酸イミ
ド共重合体水溶液（固型分33％）を調整す
る。）
Ｇ：水溶性エポキシ樹脂（ジエチレングリコール
ジグリシジルエーテル）
The method of using the coating agent for field deposits of the present invention involves spraying each component separately or in a mixed state onto field deposits to form a consolidated layer. A preferred method of use is to separately spray a solution containing a mixture of resin components and a solution containing a mixture of a curing agent and a crosslinking agent. When spraying separately, the order and number of spraying is not limited. The concentration of the solution to be sprayed is solid content 2~
About 10% by weight is preferable. The following methods are available for spraying, and spraying is possible even when the field layer is wet. 25 to 600 g, preferably 50 to 400 g of resin is applied to the field piles per square meter of pile surface. At that time, a sprayer can be used to uniformly spray the entire surface of the heap. The chemical may be sprayed only once for each component, but may be sprayed multiple times. The surface of the pile is pressure-formed using a pressure roller or a pressure plate, and the average density of the surface layer at a depth of about 40 cm from the surface (the average density sampled from each layer that divides the surface into multiple equal parts) ).
After increasing the amount by 5 to 30%, spray on the surface in the same way. Among the above methods, the following methods are particularly preferred. When an aqueous solution of a polymer compound having an imide bond or (and) polyethyleneimine and a water-soluble dialdehyde are mixed before or by spraying, they react and gel within 3 hours, and further harden and solidify. Conjunctions are formed. After gelation, the drug will not run out even if it rains, and a consolidated layer will be formed. The gelation mechanism of a polymer compound having an imide bond, polyethyleneimine, and water-soluble dialdehyde is estimated to be based on the following formula [] or []. When the coating agent contains components other than a polymeric compound having an imide bond, polyethyleneimine, and water-soluble dialdehyde, gelation and hardening occur in a state containing the other components, and other components are added to the inside of the gel-like network structure. The components of will be in a dispersed state. Therefore, even if a resin aqueous dispersion that can form a film at room temperature is included, the resin aqueous dispersion dries and forms a film while being covered with a gel-like network structure, so if rainfall occurs before drying, However, it will not flow out after gelation. When a crosslinking agent is used together with an aqueous resin dispersion capable of forming a film at room temperature, gelation occurs together with crosslinking, so that the aqueous resin dispersion does not flow out and a stronger consolidated layer is formed. The consolidated layer prevents scattering due to wind, and also prevents rainwater from penetrating when it rains, thereby preventing an increase in moisture content. In particular, when a resin aqueous dispersion capable of forming a film at room temperature is added, the weather resistance of the consolidated layer is excellent, and a uniform consolidated layer can be maintained for a long period of time. Since the coating agent for field deposits of the present invention can be used in the form of an aqueous solution, there is no danger of toxicity or fire caused by solvents, and it is easy to dilute with water and clean equipment. Moreover, it is easy to spray and can be applied over a wide range. can. [Effects of the Invention] According to the present invention, since a solidified layer is formed by a polymer compound having an imide bond or polyethyleneimine and a water-soluble dialdehyde,
It quickly gels after being sprayed, and even if it rains afterwards, the chemical will not run off, and it can effectively form a consolidated layer on open deposits, thereby preventing the scattering of sediment and increases in water content. It also has the effect of making the spraying work easier and safer. [Examples] Examples of the present invention will be described below. Five tons of Goonyella coal were piled up in a conical shape to form a coal pile. Next, add the liquid in Table 1 to 2/m 2
After 30 minutes, the solution shown in Table 1 was sprayed at a ratio of 2/m 2 (However, in the comparative example, only the solution was sprayed). After spraying the liquid, after 3 hours, the pile pile was exposed to artificial rain with a rainfall intensity of 30 mm/hr for 30 minutes, and the surface layer condition of the pile pile was observed. The presence or absence of was investigated. In addition, the condition of the consolidated layer was examined after two months after these piles were left to stand naturally. The results are also listed in Table 1. The liquids in Table 1 are solutions of the following drugs diluted with water to the solid content shown in the table, or solutions as they are. A: Polyethyleneimine aqueous solution B: 15% by weight aqueous solution of glyoxal C: Butyl acrylate-methyl methacrylate copolymer resin emulsion D: Styrene-butadiene copolymer rubber latex E: Vinyl acetate resin emulsion F: Acid imide copolymer aqueous solution (isobutylene - A maleic anhydride copolymer is heated to 180°C under an ammonia atmosphere to obtain an isobutylene maleic imide-maleic anhydride copolymer (molar ratio 3:2:1), and the isobutylene-maleic anhydride copolymer is Maleic anhydride copolymer 40
Parts by weight, 7 parts by weight of industrial 25% ammonia water,
and 80 parts by weight of water are placed in a container, heated to a liquid temperature of 85°C, and stirred for 2 hours to uniformly dissolve and prepare an acid imide copolymer aqueous solution (solid content 33%). ) G: Water-soluble epoxy resin (diethylene glycol diglycidyl ether)
【表】
第１表の結果から、実施例のものは薬剤散布の
３時間後に降雨があつても薬剤は流出せず、固結
層を形成することがわかる。また常温造膜性を有
する樹脂水分散体を添加したものは、２カ月放置
した場合の固結層が優れ、耐侯性を有することが
わかる。[Table] From the results in Table 1, it can be seen that in the examples, even if it rained 3 hours after spraying the chemicals, the chemicals did not flow out and a consolidated layer was formed. Furthermore, it can be seen that the product to which the aqueous resin dispersion having film-forming properties at room temperature was added had an excellent consolidated layer when left for two months, and had weather resistance.
Claims (1)
エチレンイミンの水溶液と水溶性ジアルデヒドと
から成ることを特徴とする野積堆積物のコーテイ
ング剤。 ２ イミド結合を有する高分子化合物が酢酸ビニ
ル−無水マレイン酸−マレインイミド共重合体、
スチレン−無水マレイン酸−マレインイミド共重
合体、イソブチレン−無水マレイン酸−マレイン
イミド共重合体、ビニルメチルエーテル−マレイ
ンイミド共重合体、もしくはビニルピロリドン−
マレインイミド共重合体、またはスチレン−無水
マレイン酸共重合体、もしくはイソブチレン−無
水マレイン酸共重合体とアンモニアを反応させて
分子内の無水マレイン酸の一部をマレインイミド
化したものである特許請求の範囲第１項記載のコ
ーテイング剤。 ３ 水溶性ジアルデヒドがグリオキザール、マロ
ンジアルデヒド、スクシンジアルデヒド、グルタ
ルジアルデヒド、ピメリンジアルデヒド、または
スペリンジアルデヒドである特許請求の範囲第１
項または第２項記載のコーテイング剤。[Scope of Claims] 1. A coating agent for field deposits, comprising an aqueous solution of a polymer compound having an imide bond or polyethyleneimine, and a water-soluble dialdehyde. 2. The polymer compound having an imide bond is a vinyl acetate-maleic anhydride-maleimide copolymer,
Styrene-maleic anhydride-maleimide copolymer, isobutylene-maleic anhydride-maleimide copolymer, vinyl methyl ether-maleimide copolymer, or vinylpyrrolidone-
A patent claim in which a part of maleic anhydride in the molecule is converted into maleimide by reacting a maleimide copolymer, a styrene-maleic anhydride copolymer, or an isobutylene-maleic anhydride copolymer with ammonia. The coating agent according to item 1. 3. Claim 1, wherein the water-soluble dialdehyde is glyoxal, malondialdehyde, succindialdehyde, glutardialdehyde, pimelinedialdehyde, or sperinedialdehyde.
The coating agent according to item 1 or 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7968085A JPS61236867A (en) | 1985-04-15 | 1985-04-15 | Coating agent for open-air storage deposit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7968085A JPS61236867A (en) | 1985-04-15 | 1985-04-15 | Coating agent for open-air storage deposit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61236867A JPS61236867A (en) | 1986-10-22 |
| JPS6325030B2 true JPS6325030B2 (en) | 1988-05-24 |
Family
ID=13696910
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7968085A Granted JPS61236867A (en) | 1985-04-15 | 1985-04-15 | Coating agent for open-air storage deposit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61236867A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6435417U (en) * | 1987-08-25 | 1989-03-03 | ||
| JPH0327622U (en) * | 1989-07-21 | 1991-03-20 |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PE20151551A1 (en) | 2012-11-20 | 2015-11-07 | Kuraray Co | AGENT TO AVOID DUST SPREADING AND A METHOD TO AVOID DUST SPREADING BY USING THE SAME |
-
1985
- 1985-04-15 JP JP7968085A patent/JPS61236867A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6435417U (en) * | 1987-08-25 | 1989-03-03 | ||
| JPH0327622U (en) * | 1989-07-21 | 1991-03-20 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61236867A (en) | 1986-10-22 |
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