JP2842096B2 - Inorganic paper - Google Patents
Inorganic paperInfo
- Publication number
- JP2842096B2 JP2842096B2 JP28443892A JP28443892A JP2842096B2 JP 2842096 B2 JP2842096 B2 JP 2842096B2 JP 28443892 A JP28443892 A JP 28443892A JP 28443892 A JP28443892 A JP 28443892A JP 2842096 B2 JP2842096 B2 JP 2842096B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- hydroxide powder
- magnesium hydroxide
- aluminum hydroxide
- paper
- 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 - Fee Related
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Description
【０００１】[0001]
【産業上の利用分野】本発明は、主として建築物の壁材
等に難燃性を付与するための無機質紙に関し、特に防炎
２級の規格に合格する難燃性を有する無機質紙に関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inorganic paper mainly for imparting flame retardancy to building wall materials and the like, and more particularly to an inorganic paper having flame retardancy which meets the second grade of flameproofing. It is.
【０００２】[0002]
【従来の技術】建築物の難燃化や防火対策が重要視され
ている昨今、各種の建材に難燃性を付与する無機質紙が
使用されている。この種の無機質紙としては、水酸化ア
ルミニウム粉末高含有紙が一般に知られている。2. Description of the Related Art In recent years, the importance of fire retardancy and fire prevention measures for buildings has been emphasized, and inorganic papers that impart flame retardancy to various building materials have been used. As this kind of inorganic paper, paper containing aluminum hydroxide powder in high content is generally known.
【０００３】[0003]
【発明が解決しようとする課題】水酸化アルミニウム粉
末高含有紙に通常使用されている水酸化アルミニウム
は、ギブサイト結晶構造を有し、２５０〜３５０℃にて
結晶水を脱水するため優れた難燃効果を示すとともに、
取扱作業面や公害等の衛生面での問題がないため、現状
においては安全な無機質紙であるといえる。しかし、こ
の無機質紙の繊維質物質の主体となるセルロース繊維
は、本発明者らの検討によれば、図１の示差熱分析測定
結果に示すように加熱した場合に、２５０℃付近より着
火炎焼し、５００℃付近まで燃焼が続く状態となる。従
って、水酸化アルミニウムはその結晶水の脱水分解作用
が、セルロース繊維が燃焼を終える温度よりも１００℃
以上前に終わってしまう傾向が見られ、その結果、水酸
化アルミニウム粉末高含有紙は、難燃性能の一般的評価
であるＪＩＳ Ａ １３２２規格の燃焼試験における残
炎時間が、若干残る傾向があった。The aluminum hydroxide usually used for the paper containing high content of aluminum hydroxide powder has a gibbsite crystal structure and dehydrates water of crystallization at 250 to 350 ° C., so that it has excellent flame retardancy. While showing the effect,
At present, it can be said that it is a safe inorganic paper because there is no problem in terms of handling work and sanitation such as pollution. However, according to the study by the present inventors, when heated as shown in the differential thermal analysis measurement results of FIG. It is baked, and the combustion continues to about 500 ° C. Therefore, aluminum hydroxide has a dehydration / decomposition effect of water of crystallization that is 100 ° C. lower than the temperature at which the cellulose fibers finish burning.
As a result, there is a tendency that the after-flame time in the combustion test of JIS A 1322 standard, which is a general evaluation of the flame-retardant performance, remains slightly in the aluminum hydroxide powder-rich paper. Was.
【０００４】本発明は、このような事情に鑑みてなされ
たもので、その課題は、残炎時間がなく、防炎２級の規
格に合格する優れた難燃性を有する無機質紙を提供する
ことにある。The present invention has been made in view of such circumstances, and an object of the present invention is to provide an inorganic paper which has no after-flame time and has excellent flame retardancy which meets the second grade of flame prevention. It is in.
【０００５】[0005]
【課題を解決するための手段】本発明によれば、セルロ
ース繊維を主体とする繊維質物質１５〜３５重量％に、
水酸化マグネシウム粉末と水酸化アルミニウム粉末との
混合物６５〜８５重量％を定着担持せしめたシート状材
料であって、前記混合物中の水酸化マグネシウム粉末の
割合を５０重量％以上とする無機質紙により、上記の課
題を解決することができる。According to the present invention, a fibrous substance mainly composed of cellulose fiber is added to 15 to 35% by weight of the fibrous substance.
A sheet-like material in which a mixture of magnesium hydroxide powder and aluminum hydroxide powder is fixed and supported by 65 to 85% by weight, wherein the ratio of the magnesium hydroxide powder in the mixture is 50% by weight or more. The above problem can be solved.
【０００６】以下に本発明の詳細について説明する。本
発明で用いる水酸化マグネシウムには、一般にブルース
石として天然に産出する天然品および合成品があるが、
そのいずれを用いてもよい。また、水酸化アルミニウム
についても、天然品および合成品のいずれを用いてもよ
い。The details of the present invention will be described below. The magnesium hydroxide used in the present invention generally includes natural products and synthetic products naturally occurring as brute stone,
Either of them may be used. As for aluminum hydroxide, any of natural products and synthetic products may be used.
【０００７】図１に水酸化アルミニウム、水酸化マグネ
シウムおよびセルロース繊維の示差熱分析測定結果を示
すが、図１のグラフからわかるように、水酸化アルミニ
ウム粉末高含有紙に通常使用されている水酸化アルミニ
ウムは約２５０〜３５０℃で脱水分解するが、水酸化マ
グネシウムは約３５０〜４５０℃で脱水する。また繊維
質物質の主体となるセルロース繊維は２５０℃付近より
着火炎焼し、５００℃付近で燃焼を終える。FIG. 1 shows the results of differential thermal analysis of aluminum hydroxide, magnesium hydroxide and cellulose fibers. As can be seen from the graph of FIG. Aluminum dehydrates at about 250-350 ° C, while magnesium hydroxide dehydrates at about 350-450 ° C. Cellulose fibers, which are mainly composed of fibrous substances, are ignited and flame-burned at around 250 ° C. and finish burning at around 500 ° C.
【０００８】本発明は上述した水酸化アルミニウムと水
酸化マグネシウムの結晶水の脱水温度の違いに着眼した
結果、水酸化アルミニウムと水酸化マグネシウムとの混
合物を無機質粉末として使用することにより、ＪＩＳ
Ａ １３２２規格の燃焼試験において優れた効果を示す
ことを見出し、本発明を完成させたものである。The present invention focuses on the difference in the dehydration temperature of the water of crystallization between aluminum hydroxide and magnesium hydroxide. As a result, the use of a mixture of aluminum hydroxide and magnesium hydroxide as an inorganic powder allows the JIS to be improved.
The present invention has been found to exhibit excellent effects in a combustion test of A1322 standard, and has completed the present invention.
【０００９】すなわち、水酸化アルミニウム粉末と水酸
化マグネシウム粉末を併用した場合には、セルロース繊
維の着火温度付近での水酸化アルミニウムによる脱水吸
熱作用と、セルロース繊維が燃焼を終える温度付近まで
の水酸化マグネシウムによる脱水吸熱作用との２回に亘
る吸熱作用が相乗効果となって、優れた難燃性を有する
無機質紙を提供することが可能となるのである。That is, when the aluminum hydroxide powder and the magnesium hydroxide powder are used in combination, the dehydration and endothermic effect of the aluminum hydroxide near the ignition temperature of the cellulose fiber and the hydroxylation until the temperature at which the cellulose fiber finishes burning. The two endothermic actions of the dehydrating endothermic action of magnesium and the endothermic action of magnesium have a synergistic effect, and an inorganic paper having excellent flame retardancy can be provided.
【００１０】ただし、水酸化マグネシウムと水酸化アル
ミニウムを併用する場合に、その配合を水酸化アルミニ
ウム粉末重量％≦水酸化マグネシウム粉末重量％の比率
となるように混合しなければ、所望の難燃効果が得られ
ない結果が生じる。すなわち、前述したようにセルロー
ス繊維が燃焼を終える温度付近まで結晶水の脱水による
吸熱作用が行われる方が、セルロース繊維が着火する温
度付近での脱水よりも難燃性に関して効果があるので、
水酸化マグネシウムの脱水が水酸化アルミニウムの脱水
よりも多くなければ、かえって水酸化マグネシウムと水
酸化アルミニウムを併用した場合に、水酸化マグネシウ
ムの脱水が少ない分、難燃性効果が軽減されてしまうこ
とになる。従って、特に難燃性の面からは、水酸化アル
ミニウム粉末重量％と水酸化マグネシウム粉末重量％の
配合を同量にするよりも、水酸化マグネシウム粉末重量
％の方を多く配合する。However, when magnesium hydroxide and aluminum hydroxide are used in combination, the desired flame-retardant effect is obtained unless the mixing ratio is such that aluminum hydroxide powder weight% ≦ magnesium hydroxide powder weight%. Is obtained. That is, as described above, the endothermic effect of dehydration of the crystallization water is performed up to the vicinity of the temperature at which the cellulose fiber finishes burning, since the effect on the flame retardancy is greater than the dehydration at the temperature near the ignition of the cellulose fiber,
If magnesium hydroxide is not dehydrated more than aluminum hydroxide, the combined use of magnesium hydroxide and aluminum hydroxide will reduce the flame retardant effect due to less dehydration of magnesium hydroxide. become. Therefore, from the aspect of flame retardancy, the magnesium hydroxide powder wt% is more blended than the aluminum hydroxide powder wt% and magnesium hydroxide powder wt% blending in the same amount.
【００１１】本発明で使用される繊維質物質としては、
製紙用パルプのごときセルロース繊維を主体とするもの
であるが、水酸化マグネシウム粉末と水酸化アルミニウ
ム粉末との混合物の繊維への定着効果を高めるために、
フィブリル化したセルロース繊維や長繊維の天然繊維素
パルプをカチオン化したカチオン変性パルプを用いるこ
とが好ましい。The fibrous substance used in the present invention includes:
Although it is mainly composed of cellulose fibers such as pulp for papermaking, in order to enhance the fixing effect on fibers of a mixture of magnesium hydroxide powder and aluminum hydroxide powder,
It is preferable to use cation-modified pulp obtained by cationizing natural fibrous pulp of fibrillated cellulose fibers or long fibers.
【００１２】本発明の無機質紙を製造するに際しては、
繊維質物質と水酸化マグネシウム粉末／水酸化アルミニ
ウム粉末混合物を所定割合となるように混合して水懸濁
液となし、これを通常の抄紙方法を用いて抄紙する方法
が採用できる。なお、抄造過程において従来慣用されて
いるような有機質結合剤や結合助剤、さらにはサイズ剤
や湿潤紙力増強剤等を必要に応じて紙料に添加してもよ
い。In producing the inorganic paper of the present invention,
A method in which a fibrous substance and a mixture of magnesium hydroxide powder / aluminum hydroxide powder are mixed at a predetermined ratio to form an aqueous suspension, and this is made into a paper using a normal paper making method can be adopted. In the papermaking process, organic binders and binding aids conventionally used, as well as sizing agents and wet paper strength enhancers, may be added to the stock as required.
【００１３】[0013]
【実施例】以下に本発明の実施例および比較例を挙げて
詳述する。 ［実施例１］ 針葉樹クラフトパルプ（ＮＢＫＰ）をビーター式叩解機
を用いて濾水度３５０ｍｌ ｃ．ｓ．ｆ．に叩解したセ
ルロースパルプ２０重量％と、平均粒径２．５ミクロン
の水酸化マグネシウム粉末５２．５重量％と水酸化アル
ミニウム粉末１７．５重量％とを混合して水懸濁液と
し、これにアルキルケテンダイマー系中性サイズ剤を
０．４重量％（全繊維質分重量に対して）、変性ポリア
ミド樹脂系湿潤紙力増強剤を０．２重量％（全固形分重
量に対して）およびポリアクリルアミド系結合助剤を
０．２重量％（全固形分重量に対して）添加したのち、
シート坪量が１３０ｇ／ｍ2 になるように試験用手抄き
角型シートマシン（２５０×２５０ｍｍ）を用いて無機
質紙を作製した。EXAMPLES Hereinafter, the present invention will be described in detail with reference to Examples and Comparative Examples. [Example 1] Softwood kraft pulp (NBKP) was used in a beater-type beater with a freeness of 350 ml. C. s. f. 20% by weight of cellulose pulp beaten to a mixture of 52.5% by weight of magnesium hydroxide powder having an average particle diameter of 2.5 microns and 17.5% by weight of aluminum hydroxide powder to form an aqueous suspension. 0.4% by weight (based on the total fiber content) of the alkyl ketene dimer-based neutral sizing agent, 0.2% by weight (based on the total solids content) of the modified polyamide resin-based wet paper strength agent, and After adding 0.2% by weight (based on the total solid weight) of a polyacrylamide-based binding aid,
Inorganic paper was prepared using a hand-made square sheet machine for testing (250 × 250 mm) so that the sheet basis weight was 130 g / m 2 .
【００１４】この無機質紙について、ＪＩＳ Ａ １３
２２「建築物用薄物材料の難燃性試験方法」に従って、
難燃性能評価試験を行った。試験装置としては、４５°
メッケルバーナー法燃焼性試験器ＦＬ−４５型を使用し
た。結果を表１に示す。この結果から明らかなように、
この無機質紙（水酸化マグネシウム粉末を水酸化アルミ
ニウム粉末よりも多量に混合したもの）は残炎時間がな
く、炭化長も１００ｍｍ以下の範囲内にあり、防炎２級
の規格に合格するものであった。Regarding the inorganic paper, JIS A 13
According to 22 "Test method for flame retardancy of thin building materials"
A flame retardant performance evaluation test was performed. 45 ° for test equipment
The FL-45 type Meckelburner flammability tester was used. Table 1 shows the results. As evident from this result,
This inorganic paper (a mixture of magnesium hydroxide powder and aluminum hydroxide powder in a larger amount) has no after-flame time, has a carbonization length within the range of 100 mm or less, and passes the flame-proof second grade standard. there were.
【００１５】なお、表１中の合否の判定は、○：合格、
×：不合格として表した。また、防炎性の規格は以下の
とおりとした。 種 類 炭化長 残 炎 残 じ ん 防炎１級 ５ｃｍ以下 なし＊ １分後に存しないこと 防炎２級 １０ｃｍ以下 ５秒以下 １分後に存しないこと 防炎３級 １５ｃｍ以下 ５秒以下 １分後に存しないこと 註 ＊：大体１秒以下のことである。[0015] The pass / fail judgment in Table 1 is as follows:
X: expressed as reject. Further, the flameproofing standards were as follows. Kind of carbonized long residue Flame residue Dustproof 1st grade 5cm or less None * Does not exist after 1 minute Flameproof 2nd grade 10cm or less 5s or less Not present after 1 minute Not exist Note *: About 1 second or less.
【００１６】［実施例２］ セルロースパルプと無機質粉末との比率をセルロースパ
ルプ３０重量％、水酸化マグネシウム粉末３５重量％、
水酸化アルミニウム粉末３５重量％とした以外は、実施
例１と同様にして無機質紙を作製した。この無機質紙の
難燃性能評価試験を行った結果を表１に示す。この結果
から明らかなように、この無機質紙（水酸化マグネシウ
ム粉末と水酸化アルミニウム粉末とを同量混合したも
の）は、残炎時間がなく、炭化長も１００ｍｍ以下の範
囲内にあり、防炎２級の規格に合格するものであった。Example 2 The ratio of cellulose pulp to inorganic powder was 30% by weight of cellulose pulp, 35% by weight of magnesium hydroxide powder,
An inorganic paper was produced in the same manner as in Example 1 except that the amount of aluminum hydroxide powder was changed to 35% by weight. Table 1 shows the results of a flame retardancy evaluation test performed on the inorganic paper. As is clear from the results, this inorganic paper (a mixture of the same amount of magnesium hydroxide powder and aluminum hydroxide powder) has no after-flame time, has a carbonization length within the range of 100 mm or less, and has a flameproofing property. It passed the second grade standard.
【００１７】［比較例１］ セルロースパルプと無機質粉末との比率をセルロースパ
ルプ３０重量％、水酸化マグネシウム粉末１７．５重量
％、水酸化アルミニウム粉末５２．５重量％とした以外
は、実施例１と同様にして無機質紙を作製した。この無
機質紙の難燃性能評価試験を行った結果を表１に示す。
この結果から明らかなように、この無機質紙（水酸化マ
グネシウム粉末を水酸化アルミニウム粉末よりも少量に
混合したもの）は、残炎時間が５秒以上あり、防炎１〜
３級の全ての規格に合格しないものであった。Comparative Example 1 Example 1 was repeated except that the ratio of cellulose pulp to inorganic powder was 30% by weight of cellulose pulp, 17.5% by weight of magnesium hydroxide powder, and 52.5% by weight of aluminum hydroxide powder. In the same manner as described above, an inorganic paper was produced. Table 1 shows the results of a flame retardancy evaluation test performed on the inorganic paper.
As is evident from the results, this inorganic paper (a mixture of magnesium hydroxide powder in a smaller amount than aluminum hydroxide powder) has a residual flame time of 5 seconds or more,
It did not pass all the standards of the third grade.
【００１８】［比較例２］ セルロースパルプと水酸化マグネシウム粉末との比率を
セルロースパルプ３５重量％、水酸化マグネシウム粉末
６５重量％とした以外は、実施例１と同様にして無機質
紙を作製した。この無機質紙（水酸化マグネシウム粉末
を単独で使用したもの）の難燃性能評価試験を行った結
果を表１に示す。この結果から明らかなように、この無
機質紙は、残炎時間がなく、炭化長も１００ｍｍ以下の
範囲内にあり、防炎２級の規格に合格するものであった
が、後述する実施例４と比較すると炭化長は大きかっ
た。Comparative Example 2 An inorganic paper was prepared in the same manner as in Example 1 except that the ratio of cellulose pulp to magnesium hydroxide powder was 35% by weight of cellulose pulp and 65% by weight of magnesium hydroxide powder. Table 1 shows the results of a flame retardancy evaluation test of this inorganic paper (using magnesium hydroxide powder alone). As is clear from these results, this inorganic paper had no after-flame time, had a carbonized length within the range of 100 mm or less, and passed the second-class flameproofing standard. The carbonization length was larger than that of.
【００１９】［実施例３］ セルロースパルプと無機質粉末との比率をセルロースパ
ルプ３５重量％、水酸化マグネシウム粉末４８．８重量
％、水酸化アルミニウム粉末１６．２重量％とした以外
は、実施例１と同様にして無機質紙を作製した。この無
機質紙の難燃性能評価試験を行った結果を表１に示す。
この結果から明らかなように、この無機質紙（水酸化マ
グネシウム粉末を水酸化アルミニウム粉末よりも多量に
混合したもの）は、残炎時間がなく、炭化長も１００ｍ
ｍ以下の範囲内にあり、防炎２級の規格に合格するもの
であった。またこの無機質紙は、無機質粉末として水酸
化マグネシウム粉末を単独で使用した比較例２の無機質
紙よりも、炭化長が小さくなる傾向が認められた。Example 3 Example 1 was repeated except that the ratio of cellulose pulp to inorganic powder was 35% by weight of cellulose pulp, 48.8% by weight of magnesium hydroxide powder and 16.2% by weight of aluminum hydroxide powder. In the same manner as described above, an inorganic paper was produced. Table 1 shows the results of a flame retardancy evaluation test performed on the inorganic paper.
As is clear from the results, this inorganic paper (a mixture of magnesium hydroxide powder in a larger amount than aluminum hydroxide powder) has no after-flame time and has a char length of 100 m.
m or less, and passed the flameproof second grade standard. In addition, the inorganic paper had a tendency to have a shorter carbonization length than the inorganic paper of Comparative Example 2 using magnesium hydroxide powder alone as the inorganic powder.
【００２０】［比較例３］ セルロースパルプと無機質粉末との比率をセルロースパ
ルプ３５重量％、水酸化マグネシウム粉末３０重量％、
水酸化アルミニウム粉末３５重量％とした以外は、実施
例１と同様にして無機質紙を作製した。この無機質紙の
難燃性能評価試験を行った結果を表１に示す。この結果
から明らかなように、この無機質紙（水酸化マグネシウ
ム粉末を水酸化アルミニウム粉末より少量混合したも
の）は、炭化長、残炎時間とも防炎２級の合格基準から
遥かに逸脱するものであった。Comparative Example 3 The ratio of cellulose pulp to inorganic powder was 35% by weight of cellulose pulp, 30% by weight of magnesium hydroxide powder,
An inorganic paper was produced in the same manner as in Example 1 except that the amount of aluminum hydroxide powder was changed to 35% by weight. Table 1 shows the results of a flame retardancy evaluation test performed on the inorganic paper. As is evident from the results, this inorganic paper (a mixture of magnesium hydroxide powder and aluminum hydroxide powder in a smaller amount) far deviates from the passing criteria of the second class of flame prevention in both the carbonization length and the afterflame time. there were.
【００２１】[0021]
【表１】 [Table 1]
【００２２】[0022]
【発明の効果】以上説明したところからわかるように、
水酸化マグネシウム粉末と水酸化アルミニウム粉末とを
併用し、水酸化マグネシウムを水酸化アルミニウムより
も多量に含む混合物を、セルロース繊維を主体とする繊
維質物質に担持せしめてなる本発明の無機質紙によれ
ば、無害で取扱上あるいは抄造上何等問題がなく、しか
も残炎時間がなく、所期の優れた難燃性を有する無機質
紙を提供することができる。As can be seen from the above description,
According to the inorganic paper of the present invention, a mixture containing magnesium hydroxide powder and aluminum hydroxide powder in combination, and a mixture containing magnesium hydroxide in a larger amount than aluminum hydroxide is supported on a fibrous substance mainly composed of cellulose fibers. Thus, it is possible to provide an inorganic paper which is harmless, has no problem in handling or papermaking, has no after-flame time, and has an excellent flame retardancy.
【図１】水酸化アルミニウム、水酸化マグネシウムおよ
びセルロース繊維の示差熱分析測定結果を示すグラフで
ある。FIG. 1 is a graph showing the results of differential thermal analysis of aluminum hydroxide, magnesium hydroxide and cellulose fibers.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 森川 勲 東京都江東区東雲一丁目10番６号 王子 製紙株式会社商品研究所内 (72)発明者 大竹 利則 広島県呉市広末広二丁目１番１号 王子 製紙株式会社呉工場内 (56)参考文献 特開 平４−185799（ＪＰ，Ａ) 特開 平３−896（ＪＰ，Ａ) 特開 平２−33398（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) D21H 17/63 D21H 27/00──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Isao Morikawa 1-10-6 Shinonome, Koto-ku, Tokyo Oji Paper Manufacturing Co., Ltd. (72) Inventor Toshinori Ohtake 2-1-1 Hirosue Hirose, Kure City, Hiroshima Prefecture No. Oji Paper Co., Ltd. Kure Mill (56) References JP-A-4-185799 (JP, A) JP-A-3-896 (JP, A) JP-A-2-33398 (JP, A) (58) Survey Field (Int.Cl. 6 , DB name) D21H 17/63 D21H 27/00
Claims (1)
１５〜３５重量％に、水酸化マグネシウム粉末と水酸化
アルミニウム粉末との混合物６５〜８５重量％を定着担
持せしめたシート状材料であって、前記混合物中の水酸
化マグネシウム粉末の割合を５０重量％以上とすること
を特徴とする無機質紙。1. Magnesium hydroxide powder and hydroxide are added to 15 to 35% by weight of a fibrous substance mainly composed of cellulose fibers.
A sheet-like material on which a mixture of 65 and 85% by weight with aluminum powder is fixed and supported , wherein the hydroxyl compound in the mixture is
Inorganic paper characterized in that the proportion of magnesium oxide powder is 50% by weight or more .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28443892A JP2842096B2 (en) | 1992-10-22 | 1992-10-22 | Inorganic paper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28443892A JP2842096B2 (en) | 1992-10-22 | 1992-10-22 | Inorganic paper |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06136688A JPH06136688A (en) | 1994-05-17 |
| JP2842096B2 true JP2842096B2 (en) | 1998-12-24 |
Family
ID=17678553
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28443892A Expired - Fee Related JP2842096B2 (en) | 1992-10-22 | 1992-10-22 | Inorganic paper |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2842096B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012001926A1 (en) * | 2010-06-28 | 2012-01-05 | パナソニック株式会社 | Speaker component, speaker using same, electronic apparatus, and moving means |
| JP2012010215A (en) * | 2010-06-28 | 2012-01-12 | Panasonic Corp | Diaphragm for speaker, and speaker, electronic apparatus and transportation means using the same |
| JP2012060414A (en) * | 2010-09-09 | 2012-03-22 | Panasonic Corp | Speaker voice coil bobbin and speaker using the same and electronic equipment and device using the speaker |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5462574B2 (en) * | 2009-10-02 | 2014-04-02 | 大建工業株式会社 | Prepreg and decorative board using it |
-
1992
- 1992-10-22 JP JP28443892A patent/JP2842096B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012001926A1 (en) * | 2010-06-28 | 2012-01-05 | パナソニック株式会社 | Speaker component, speaker using same, electronic apparatus, and moving means |
| JP2012010215A (en) * | 2010-06-28 | 2012-01-12 | Panasonic Corp | Diaphragm for speaker, and speaker, electronic apparatus and transportation means using the same |
| CN102959985A (en) * | 2010-06-28 | 2013-03-06 | 松下电器产业株式会社 | Speaker component, speaker using same, electronic apparatus, and moving means |
| JP2012060414A (en) * | 2010-09-09 | 2012-03-22 | Panasonic Corp | Speaker voice coil bobbin and speaker using the same and electronic equipment and device using the speaker |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06136688A (en) | 1994-05-17 |
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