JPH0780281A - Production of ceramic hollow particles - Google Patents
Production of ceramic hollow particlesInfo
- Publication number
- JPH0780281A JPH0780281A JP18914693A JP18914693A JPH0780281A JP H0780281 A JPH0780281 A JP H0780281A JP 18914693 A JP18914693 A JP 18914693A JP 18914693 A JP18914693 A JP 18914693A JP H0780281 A JPH0780281 A JP H0780281A
- Authority
- JP
- Japan
- Prior art keywords
- particles
- ceramic powder
- ceramic
- core
- predetermined
- 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.)
- Pending
Links
- 239000002245 particle Substances 0.000 title claims abstract description 35
- 239000000919 ceramic Substances 0.000 title claims abstract description 34
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 239000000843 powder Substances 0.000 claims abstract description 25
- 239000011230 binding agent Substances 0.000 claims abstract description 17
- 239000011162 core material Substances 0.000 claims abstract description 15
- 239000007771 core particle Substances 0.000 claims abstract description 11
- 239000011248 coating agent Substances 0.000 claims abstract description 7
- 238000000576 coating method Methods 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims description 10
- 239000011147 inorganic material Substances 0.000 claims 1
- 229910010272 inorganic material Inorganic materials 0.000 claims 1
- 239000011368 organic material Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 11
- 239000000463 material Substances 0.000 abstract description 4
- 239000007921 spray Substances 0.000 abstract description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 10
- 239000000126 substance Substances 0.000 description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 6
- 239000000395 magnesium oxide Substances 0.000 description 5
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 3
- 239000000292 calcium oxide Substances 0.000 description 3
- 235000012255 calcium oxide Nutrition 0.000 description 3
- 238000005524 ceramic coating Methods 0.000 description 3
- 239000011247 coating layer Substances 0.000 description 3
- 239000004794 expanded polystyrene Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical group O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 229910052863 mullite Inorganic materials 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 235000010980 cellulose Nutrition 0.000 description 1
- 239000008119 colloidal silica Substances 0.000 description 1
- 229910052878 cordierite Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 229920005610 lignin Polymers 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
- 235000013379 molasses Nutrition 0.000 description 1
- 229910052575 non-oxide ceramic Inorganic materials 0.000 description 1
- 239000011225 non-oxide ceramic Substances 0.000 description 1
- 229910052574 oxide ceramic Inorganic materials 0.000 description 1
- 239000011224 oxide ceramic Substances 0.000 description 1
- 235000011007 phosphoric acid Nutrition 0.000 description 1
- 150000003016 phosphoric acids Chemical class 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 235000019422 polyvinyl alcohol Nutrition 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
Landscapes
- Glanulating (AREA)
- Manufacturing Of Micro-Capsules (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、断熱材、濾過材その他
に使用されるセラミック中空体粒子の製造法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing hollow ceramic particles used for heat insulating materials, filter materials and the like.
【０００２】[0002]
【従来の技術】従来、造粒された有機物芯材粒子にバイ
ンダーを介してセラミック粉（耐火原料粉を含む。以下
同じ。）を被覆させ、これらを乾燥させたのち、被覆し
たセラミック粉を焼結してこれらの焼結中空体粒子を製
造する製造法においては、特開平２−２７７５４４号公
報などに記載されているように、、前記芯材粒子にセラ
ミック粉を所定厚みに被覆するためには、（ａ）芯材粒
子にバインダーを塗布し、次いで、（ｂ）セラミック粉
をバインダー塗布面上に付着させ、少なくとも、この２
工程を段階的に繰り返しながら、セラミック粉を所定厚
みに被覆していた。2. Description of the Related Art Conventionally, granulated organic core particles are coated with a ceramic powder (including refractory raw material powder; the same applies hereinafter) through a binder, and these are dried, and then the coated ceramic powder is burned. In the production method for producing these sintered hollow body particles by binding, in order to coat the core particles with a ceramic powder to a predetermined thickness, as described in JP-A-2-277544 and the like. Of (a) applies a binder to the core material particles, and then (b) deposits ceramic powder on the binder application surface, and
While repeating the process stepwise, the ceramic powder was coated to a predetermined thickness.
【０００３】このため、（ａ）工程と（ｂ）工程とで
は、製造装置を別々にするか、同じ製造装置で行うとき
は、異なる工程管理が必要となり、歩留りの低下やコス
ト高を招く等の欠点を有していた。For this reason, in the steps (a) and (b), when the manufacturing apparatuses are separated or when the same manufacturing apparatus is used, different process management is required, resulting in a decrease in yield and an increase in cost. Had the drawback of.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、芯材粒子に
所定厚みのセラミック粉を被覆させる工程が、１工程、
１製造装置で、短時間に行うことができるセラミック中
空体粒子の製造法を提供するものである。DISCLOSURE OF THE INVENTION According to the present invention, a step of coating core particles with a ceramic powder having a predetermined thickness is one step,
The present invention provides a method for producing ceramic hollow body particles which can be performed in a short time with one production apparatus.
【０００５】[0005]
【課題を解決するための手段】本発明は、上記目的を達
成するため、有機物芯材粒子の表面にバインダーを介し
てセラミック粉を被覆させる工程を含むセラミック中空
体粒子の製造法において、所定径の球状有機物芯材粒子
にセラミック粉を所定厚みに被覆させる工程が、前記芯
材粒子の所定量全量を流動させて、それに有機物又は無
機物又は両者からなる所定量のバインダー液を噴射する
と共に、所定量のセラミック粉を供給することからなる
セラミック中空体粒子の製造法を提供するものである。In order to achieve the above object, the present invention provides a method for producing hollow ceramic particles, which comprises a step of coating the surface of organic core particles with ceramic powder through a binder. The step of coating the spherical organic substance core material particles with ceramic powder to a predetermined thickness is such that a predetermined amount of the core material particles is allowed to flow and a predetermined amount of binder liquid consisting of an organic substance or an inorganic substance or both is sprayed onto the core substance particles. The present invention provides a method for producing ceramic hollow body particles, which comprises supplying a fixed amount of ceramic powder.
【０００６】本発明において、芯材粒子は、有機可燃性
物質の球状粒子からなり、できるだけ低い温度で分解す
る物質が好ましい。また、ガス化してセラミック被覆層
を通過する際には、セラミック被覆層を破壊することな
く通過して消失する物質が好ましい。このため発泡スチ
ロール球粒子やポリエチレン球粒子等が使用される。ま
た、芯材粒子は、球径約１〜１０ミリメートルのものが
望ましく、また真円度が高く、球径分布の均一性のもの
が望まれる。In the present invention, the core material particles are composed of spherical particles of an organic combustible substance, and a substance which decomposes at a temperature as low as possible is preferable. Further, when gasifying and passing through the ceramic coating layer, a substance that passes and disappears without destroying the ceramic coating layer is preferable. For this reason, expanded polystyrene sphere particles and polyethylene sphere particles are used. Further, the core material particles preferably have a sphere diameter of about 1 to 10 mm, and have a high roundness and a uniform sphere diameter distribution.
【０００７】芯材粒子の所定量全量を流動させるために
は、図１に示すような回転容器に所定量全量を入れて回
転させる方法、図２に示すように、容器１Ｂ内に所定量
全量１１Ｂを入れたのち、底部１２Ｂから管１３Ｂの圧
力空気で浮遊させる方法、容器内に所定量全量を入れた
のち、容器自体を振動させる方法などやこれらを組み合
せる方法などが挙げられる。なお、図２において、２Ｂ
はセラミック粉を収容したホッパー、３Ｂはバインダー
液噴霧管である。In order to make a predetermined amount of the core material particles flow, a method of putting a predetermined amount of the core material particles in a rotary container as shown in FIG. 1 and rotating the core material particles, as shown in FIG. Examples of the method include a method of suspending 11B after the bottom portion 12B is floated by the pressurized air in the tube 13B, a method of vibrating the container itself after a predetermined amount of the total amount is put into the container, and a method of combining these. In FIG. 2, 2B
Is a hopper containing ceramic powder, and 3B is a binder liquid spray tube.
【０００８】バインダー液は、有機物としては、各種セ
ルローズ、ポリビニルアルコール、澱粉、糖蜜、リグニ
ン等の水溶液や、無機物としては、水ガラス、コロイド
アルミナ、コロイドシリカ、各種燐酸等の液状物が使用
される。As the binder liquid, aqueous solutions of various types of cellulose, polyvinyl alcohol, starch, molasses, lignin and the like are used as organic substances, and liquid substances such as water glass, colloidal alumina, colloidal silica and various phosphoric acids are used as inorganic substances. .
【０００９】バインダー液の噴射は、微細な噴霧を生成
させるため、通常はノズルで液滴を生成させるが、回転
による遠心力を利用する場合もある。Since the jetting of the binder liquid produces fine spray, droplets are usually produced by the nozzle, but centrifugal force due to rotation may be used in some cases.
【００１０】セラミック粉は、通常、粒度０．０１〜
０．８４ミリメートルの範囲のものが使用され、また、
組成としては、アルミナを７０重量部以上含み、残部が
シリカを主体とするムライト質、アルミナを７０重量部
以上含み、残部がマグネシアを主体とするスピネル質、
シリカを９０重量部以上含む高シリカ質、アルミナを９
０重量部以上含む高アルミナ質、マグネシアを９０重量
部以上含む高マグネシア質、カルシアを９０重量部以上
含む高カルシア質、マグネシアとカルシアの両者を５０
重量部含むドロマイト質、ジルコニアを９０重量部以上
含むジルコニア質およびシリカ、アルミナ、マグネシア
の３成分からなるコージエライト質のものなどの酸化物
セラミックを主成分とするもの、炭化珪素、窒化珪素お
よびサイアロンなどの非酸化物セラミックを主成分とす
るもの、炭酸カルシウム、炭酸マグネシウム、あるい
は、この両者を含むものなどが、通常、使用される。The ceramic powder usually has a particle size of 0.01-.
The range of 0.84 mm is used, and
The composition includes 70 parts by weight or more of alumina, the balance is mullite mainly composed of silica, 70 parts by weight or more of alumina and the balance is spinel mainly composed of magnesia,
High-silica containing 90 parts by weight or more of silica, alumina 9
High alumina containing 0 parts by weight or more, high magnesia containing 90 parts by weight or more magnesia, high calcia containing 90 parts by weight or more of calcia, both magnesia and calcia 50
Parts by weight dolomite, zirconia containing 90 parts by weight or more of zirconia and those mainly containing oxide ceramics such as silica, alumina, cordierite composed of three components of magnesia, silicon carbide, silicon nitride and sialon In general, the non-oxide ceramics described in 1 above, calcium carbonate, magnesium carbonate, or a mixture containing both of them are used.
【００１１】セラミック粉の供給は、ホッパー等からの
重力落下による方法、圧力空気を介して噴出させる方法
などが挙げられる。The ceramic powder can be supplied by a method such as gravity dropping from a hopper or the like, or a method of ejecting the powder through pressurized air.
【００１２】[0012]
【実施例】本発明の実施例が図１に示されている。直径
３ｍｍの発泡スチロール球粒子１１の１００重量部を回
転造粒機１に投入する。回転造粒機１を始動させ、回転
速度を所定速度に保持すると、投入された発泡スチロー
ル球粒子１１は遠心力により側壁部分で底からの高さが
最高になりながら、皿状の表面を形成しつつ全体として
回転しながらスチロール球粒子１１自身も互いに接触し
つつ個々に転動する。造粒機１の側方上部に設置された
ホッパー２には、予め粒度調整された乾燥したムライト
組成のセラミック粉２１が８０００重量部貯蔵されてお
り、下部の粉末流量調整弁２２を通じ、セラミック粉２
１を回転造粒機１に所定の供給速度で投入する。同時
に、造粒機１の直径方向に設置したバインダー供給管３
の複数のノズル３２からバインダー液３１（ポリビニル
アルコール１％水溶液）１０００重量部を回転しつつあ
る粒子群１１の表面に噴霧速度１〜５ｍｌ／秒の範囲で
調整しながら、噴射する。１〜３分間でスチロール球１
１表面がバインダー液３１で濡らされると共に、セラミ
ック粉２１が付着し、約２０分後にはスチロール球粒子
の表面に所定厚み０．５ミリメートルのセラミック層が
被覆される。セラミック層の被覆が完了すれば、造粒機
１側壁の排出口から造粒物を取り出し、底部が金あみの
乾燥容器に入れる。乾燥前重量は９１００部である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention is shown in FIG. 100 parts by weight of expanded polystyrene sphere particles 11 having a diameter of 3 mm are put into the rotary granulator 1. When the rotary granulator 1 is started and the rotational speed is maintained at a predetermined speed, the expanded polystyrene sphere particles 11 that have been introduced form a dish-shaped surface while the height from the bottom is maximized at the side wall due to the centrifugal force. While rotating as a whole, the styrene sphere particles 11 themselves also roll while individually contacting each other. The hopper 2 installed on the upper side of the granulator 1 stores 8000 parts by weight of a ceramic powder 21 of a dried mullite composition whose particle size has been adjusted in advance. Two
1 is charged into the rotary granulator 1 at a predetermined supply rate. At the same time, the binder supply pipe 3 installed in the diameter direction of the granulator 1
1000 parts by weight of the binder liquid 31 (1% aqueous solution of polyvinyl alcohol) is sprayed onto the surface of the rotating particle group 11 from the plurality of nozzles 32 while adjusting the spraying speed in the range of 1 to 5 ml / sec. Styrene ball 1 in 1-3 minutes
The surface 1 is wetted with the binder liquid 31, the ceramic powder 21 is attached, and after about 20 minutes, the surface of the styrene sphere particles is coated with a ceramic layer having a predetermined thickness of 0.5 mm. When the coating of the ceramic layer is completed, the granulated product is taken out from the discharge port on the side wall of the granulator 1 and put in a drying container having a gold net at the bottom. The weight before drying is 9100 parts.
【００１３】[0013]
【発明の効果】本発明製造法によれば、芯材粒子に所定
厚みのセラミック粉を被覆させるには、芯材粒子の所定
量の全量を流動させておき、それに所定量のバインダー
液を噴射させると共に、所定量のセラミック粉を供給す
れば、短時間に、一挙に、所定厚みのセラミック被覆層
を有する芯材粒子が、１工程、１製造装置で得られるこ
とになり、工程管理の省略化と歩留りの向上をもたらし
て大巾なコスト安をはかることができる。According to the manufacturing method of the present invention, in order to coat the core material particles with the ceramic powder of the predetermined thickness, the predetermined amount of the core material particles is made to flow, and then the predetermined amount of the binder liquid is sprayed on it. In addition, by supplying a predetermined amount of ceramic powder, core material particles having a ceramic coating layer of a predetermined thickness can be obtained at once in one step with one manufacturing apparatus, thus omitting process control. It is possible to reduce the cost significantly by improving the yield and improving the yield.
【図１】本発明製造装置例を示す説明図である。FIG. 1 is an explanatory diagram showing an example of a manufacturing apparatus of the present invention.
【図２】別の本発明製造装置例を示す説明図である。FIG. 2 is an explanatory view showing another example of the manufacturing apparatus of the present invention.
１１ 芯材粒子 ２１ セラミック粉 ３１ バインダー液 11 Core Particles 21 Ceramic Powder 31 Binder Liquid
Claims (1)
してセラミック粉を被覆させる工程を含むセラミック中
空体粒子の製造法において、所定径の球状有機物芯材粒
子にセラミック粉を所定厚みに被覆させる工程が、前記
芯材粒子の所定量全量を流動させて、それに有機物又は
無機物又は両者からなる所定量のバインダー液を噴射す
ると共に、所定量のセラミック粉を供給することからな
るセラミック中空体粒子の製造法。1. A method for producing hollow ceramic particles, which comprises a step of coating the surface of organic core particles with a ceramic powder via a binder, wherein spherical organic core particles having a predetermined diameter are coated with the ceramic powder to a predetermined thickness. The step is to flow a predetermined amount of the core material particles, and to inject a predetermined amount of a binder liquid composed of an organic material or an inorganic material or both into the core material particles, and to supply a predetermined amount of ceramic powder to the ceramic hollow body particles. Manufacturing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18914693A JPH0780281A (en) | 1993-06-30 | 1993-06-30 | Production of ceramic hollow particles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18914693A JPH0780281A (en) | 1993-06-30 | 1993-06-30 | Production of ceramic hollow particles |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0780281A true JPH0780281A (en) | 1995-03-28 |
Family
ID=16236197
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18914693A Pending JPH0780281A (en) | 1993-06-30 | 1993-06-30 | Production of ceramic hollow particles |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0780281A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0740581A4 (en) * | 1994-01-21 | 1999-06-02 | Bruce Nathaniel Gray | Particulate material |
| US6355345B1 (en) | 1997-12-12 | 2002-03-12 | Teijin Limited | Laminate film for preventing glass from shattering |
| KR101383255B1 (en) * | 2012-06-01 | 2014-04-10 | 삼화콘덴서공업주식회사 | Electrostatic force type powder coating apparatus and dielectric powder coating method for multi layer ceramic capacitor using the same |
| JP2014141371A (en) * | 2013-01-23 | 2014-08-07 | Agc Ceramics Co Ltd | Thick-skinned hollow ceramic particles and method for manufacturing the same |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03270726A (en) * | 1990-03-22 | 1991-12-02 | Kanagawa Pref Gov | Preparation of hollow sphere |
-
1993
- 1993-06-30 JP JP18914693A patent/JPH0780281A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03270726A (en) * | 1990-03-22 | 1991-12-02 | Kanagawa Pref Gov | Preparation of hollow sphere |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0740581A4 (en) * | 1994-01-21 | 1999-06-02 | Bruce Nathaniel Gray | Particulate material |
| US6355345B1 (en) | 1997-12-12 | 2002-03-12 | Teijin Limited | Laminate film for preventing glass from shattering |
| KR101383255B1 (en) * | 2012-06-01 | 2014-04-10 | 삼화콘덴서공업주식회사 | Electrostatic force type powder coating apparatus and dielectric powder coating method for multi layer ceramic capacitor using the same |
| JP2014141371A (en) * | 2013-01-23 | 2014-08-07 | Agc Ceramics Co Ltd | Thick-skinned hollow ceramic particles and method for manufacturing the same |
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