【考案の詳細な説明】[Detailed explanation of the idea]
産業上の利用分野
本考案は電磁調理器のトツププレートに関す
る。
従来技術
従来の電磁調理器のトツププレートとしては、
ガラス中に微細結晶を析出させた結晶化ガラスが
使用されている。この結晶化ガラスは通常のガラ
スに比べて熱膨張が小さく、強度も強い特長を有
している。
しかしながら、(1)耐衝撃性に劣り、機械的衝撃
によつて割れ易いこと、(2)加工性に劣ること、例
えば穴あけ加工ができない欠点を有している。
電磁調理器のトツププレートはトツププレート
の破損による感電及び火災を防止する意味から、
鋼球落下試験に合格する必要がある。結晶化ガラ
スはそれに耐えるには約５mm程度の厚さであるこ
とを必要とし、また穴あけ加工ができないため、
ネジ止め加工が不可能で、シリコーンゴム等の接
着剤で接着する必要があり、それだけ操作も煩雑
であつた。
考案の目的
本考案は従来の電磁調理器のトツププレートに
おける前記欠点を解消すべくなされたもので、そ
の目的は耐衝撃性及び加工性に優れると共に耐摩
耗性で付着食品の離型性のよい電磁調理器のトツ
ププレートを提供するにある。
考案の構成
本考案者らは、前記目的を達成すべく鋭意研究
の結果、集成マイカ板は高弾性を有し、機械的強
度にも優れ、かつ加工性を有することに着目し、
これを利用すべく検討を加えた。その結果、集成
マイカ板は電磁調理器のトツププレートとして要
求される耐摩耗性の面でモース硬が２ないし３と
柔らかいことから要改善点が存在し、また食品が
付着した場合における離型性が結晶化ガラスに劣
ることが分かつた。
本考案者らは集成マイカ板の特長を生かし、欠
点を補うために、集成マイカ板の片面もしくは両
面に、耐摩耗性、離型性に優れた無機繊維を接着
剤で結合させた板状層を設けると、その欠点を解
消し得られることが分かつた。この知見に基づい
て本考案を完成した。
本考案の要旨は、集成マイカ板の片面もしくは
両面に無機繊維を結合剤で結合した板状層を設け
てなる電磁調理器のトツププレート、にある。
これを図面に基づいて説明すると、図面は該ト
ツププレートの断面図で、第１図は無機繊維を結
合剤で結合させた板状層を集成マイカ板の片面に
設けた場合、第２図は該板状層を両面に設けた場
合を示す。
図中、１は集成マイカ板、２は無機繊維、３は
結合剤、４は無機フイラーを示す。
集成マイカ板はマイカを水ゼツト等により厚さ
数ミクロンでアスペクト比が300〜500の微細な鱗
片となしたものを抄紙器等により抄き集成マイカ
箔となしたものをシリコーン、エポキシ樹脂等で
結合させたものである。
無機繊維としてはガラス繊維、セラミツク繊維
等が用いられ、これをマツト状とし、シリコーン
樹脂等の結合剤で結合一体化した板状層とする。
この場合、硬度の大きなアルミナ、シリカ、酸化
チタン等のセラミツク粉末を無機繊維間に充填し
て結合剤で結合させた板状層にすると、耐摩耗性
が更に改善される。
この板状層を集成マイカ板の片面もしくは両面
に設けるには、シリコーン、エポキシ、ポリアミ
ド、ポリイミドの樹脂等の耐熱性樹脂からなる接
着剤で接着すればよい。
実施例
１ 集成マイカ箔60ｇ（500×1000mm）に、シリ
コーン樹脂をトルエンで７％に希釈した溶液
110ｇを含浸し、100〜110℃で乾燥してプリプ
レグのマイカシートを得た。このマイカシート
を25シート重ねて熱プレスして1.5mm厚さの集
成マイカ板を得た。
２ 1.5mm厚さのガラスマツト115ｇ（500×1000
mm）に、シリコーン樹脂9.5％、アルミナ4.4
％、溶剤（トルエン）46.5％からなる溶液を
1550ｇ含浸し、130℃で15分間乾燥してプリプ
レグのガラス繊維マツトシートを得た。これを
２枚重ねて熱プレスして1.3mmのガラスマツト
板を得た。
３ 前記集成マイカ板の片面に、シリコーン樹脂
溶液（18％）を50ｇ塗布し、乾燥後、前記２）
で得たガラスマツト板を熱プレスによつて貼合
わせ、厚さ3.0mmのトツププレートとした。
得られたトツププレートを534ｇ鋼球を使用し
て落下高さを変化させて落下試験を行つた。その
結果は次の通りであつた。
INDUSTRIAL APPLICATION FIELD The present invention relates to a top plate of an electromagnetic cooker. Conventional technology The top plate of a conventional induction cooker is
Crystallized glass, in which fine crystals are precipitated in glass, is used. This crystallized glass has smaller thermal expansion and stronger strength than normal glass. However, it has the following disadvantages: (1) It has poor impact resistance and is easily broken by mechanical shock, and (2) It has poor workability, for example, it cannot be drilled. The top plate of an electromagnetic cooker is designed to prevent electric shocks and fires caused by damage to the top plate.
Must pass a steel ball drop test. Crystallized glass needs to be about 5mm thick to withstand this, and since it cannot be drilled,
It was not possible to fix the device with screws, and it was necessary to use an adhesive such as silicone rubber to attach it, making the operation that much more complicated. Purpose of the invention The present invention was made in order to eliminate the above-mentioned drawbacks of the conventional top plate of an electromagnetic cooker.The purpose of the invention is to provide excellent impact resistance and processability, as well as wear resistance and good releasability of adhered food. To provide the top plate of the induction cooker. Structure of the invention As a result of intensive research to achieve the above object, the inventors of the present invention focused on the fact that laminated mica plates have high elasticity, excellent mechanical strength, and workability.
We have considered taking advantage of this. As a result, in terms of the wear resistance required for the top plate of an electromagnetic cooker, the laminated mica board has a soft Mohs hardness of 2 to 3, so there are areas that need improvement. was found to be inferior to crystallized glass. In order to take advantage of the features of the laminated mica board and compensate for its shortcomings, the present inventors created a plate-like layer on one or both sides of the laminated mica board, in which inorganic fibers with excellent wear resistance and mold release properties are bonded with an adhesive. It has been found that this drawback can be overcome by providing a. Based on this knowledge, we completed the present invention. The gist of the present invention resides in a top plate for an electromagnetic cooker comprising a plate-like layer formed by bonding inorganic fibers with a binder on one or both sides of a laminated mica plate. To explain this based on the drawings, the drawing is a cross-sectional view of the top plate, and Fig. 1 shows a case where a plate-like layer made of inorganic fibers bonded with a binder is provided on one side of a laminated mica plate. The case where the plate-like layer is provided on both sides is shown. In the figure, 1 is a composite mica board, 2 is an inorganic fiber, 3 is a binder, and 4 is an inorganic filler. Laminated mica board is made by forming mica into fine scales with a thickness of several microns and an aspect ratio of 300 to 500 using water zest, etc., then forming them into laminated mica foil using a paper machine, etc., and then using silicone, epoxy resin, etc. It is a combination. As the inorganic fibers, glass fibers, ceramic fibers, etc. are used, and these are made into a mat shape and are bonded together with a binder such as a silicone resin to form a plate-like layer.
In this case, abrasion resistance is further improved by filling ceramic powder such as alumina, silica, or titanium oxide, which has a high hardness, between inorganic fibers to form a plate-like layer bonded with a binder. In order to provide this plate-like layer on one or both sides of the mica board assembly, it may be bonded with an adhesive made of a heat-resistant resin such as silicone, epoxy, polyamide, or polyimide resin. Example 1 A solution of silicone resin diluted to 7% with toluene was added to 60 g (500 x 1000 mm) of laminated mica foil.
It was impregnated with 110 g and dried at 100 to 110°C to obtain a prepreg mica sheet. 25 of these mica sheets were stacked and hot pressed to obtain a laminated mica board with a thickness of 1.5 mm. 2 115g of 1.5mm thick glass mat (500 x 1000
mm), silicone resin 9.5%, alumina 4.4
%, a solution consisting of 46.5% solvent (toluene)
It was impregnated with 1550g and dried at 130°C for 15 minutes to obtain a prepreg glass fiber mat sheet. Two sheets of this were stacked and hot pressed to obtain a 1.3 mm glass mat plate. 3. Apply 50g of silicone resin solution (18%) to one side of the laminated mica board, and after drying, apply 2) above.
The glass mat plates obtained in step 1 were bonded together using a hot press to form a top plate with a thickness of 3.0 mm. The resulting top plate was subjected to a drop test using a 534g steel ball and varying the drop height. The results were as follows.
【表】
この結果が示すように、耐衝撃性が優れている
ことを示す。
考案の効果
本考案の電磁調理器のトツププレートは従来の
結晶化ガラスに比べて耐衝撃性が強く、破損によ
る感電及び火災の恐れもなく、かつ薄いものとな
し得軽量であり、また加工性もよいので、ネジ止
め等も可能で作業性も優れたものとなる等の優れ
た効果を有する。[Table] As shown in this result, impact resistance is excellent. Effects of the invention The top plate of the electromagnetic cooker of this invention has stronger impact resistance than conventional crystallized glass, has no risk of electric shock or fire due to breakage, is thin and lightweight, and is easy to process. Since it is flexible, it has excellent effects such as being able to be fastened with screws and having excellent workability.
【図面の簡単な説明】[Brief explanation of the drawing]
図面は本考案の電磁調理器のトツププレートの
断面図で、第１図は無機繊維を結合させた板状層
を集成マイカ板の片面に、第２図は両面に設けた
場合を示す。
１……集成マイカ板、２……無機繊維、３……
結合剤、４……無機フイラー。
The drawings are cross-sectional views of the top plate of the electromagnetic cooker of the present invention, where FIG. 1 shows a case in which a plate-like layer bonded with inorganic fibers is provided on one side of a composite mica board, and FIG. 2 shows a case in which it is provided on both sides. 1... laminated mica board, 2... inorganic fiber, 3...
Binder, 4...Inorganic filler.