JP4448480B2 - Electromagnetic induction heating cooking utensil, method for manufacturing the same, and electromagnetic induction heating cooker - Google Patents

Electromagnetic induction heating cooking utensil, method for manufacturing the same, and electromagnetic induction heating cooker Download PDF

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JP4448480B2
JP4448480B2 JP2005231782A JP2005231782A JP4448480B2 JP 4448480 B2 JP4448480 B2 JP 4448480B2 JP 2005231782 A JP2005231782 A JP 2005231782A JP 2005231782 A JP2005231782 A JP 2005231782A JP 4448480 B2 JP4448480 B2 JP 4448480B2
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芳夫 西本
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Mitsubishi Electric Corp
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本発明は、電磁誘導加熱用調理器具及びその製造方法並びに電磁誘導加熱調理器に関し、特に電磁誘導加熱を利用した炊飯器やコンロ等の電磁誘導加熱調理器に使用される釜や鍋、フライパンなどの電磁誘導加熱用調理器具及びその製造方法並びにこの電磁誘導加熱用調理器具を備えた電磁誘導加熱調理器に関する。   The present invention relates to a cooking utensil for electromagnetic induction heating, a method for manufacturing the same, and an electromagnetic induction heating cooker, and more particularly, a pot, a pan, a frying pan, and the like used for an electromagnetic induction heating cooker such as a rice cooker or a stove using electromagnetic induction heating. The present invention relates to an electromagnetic induction heating cooking utensil, a method for manufacturing the same, and an electromagnetic induction heating cooker equipped with the electromagnetic induction heating cooking utensil.

電磁誘導加熱調理器である炊飯器やコンロは、高周波磁場発生装置である誘導加熱コイルが磁性金属である鉄やステンレスに渦電流を発生させて発熱を起こすものであり、いわゆる電磁誘導加熱を利用したものである。しかし、これらの磁性金属は熱伝導率が小さいため、食品を速やかに且つ均一に調理することが困難であるという問題点があった。   Rice cookers and stoves that are electromagnetic induction heating cookers are those in which induction heating coils that are high-frequency magnetic field generators generate heat by generating eddy currents in magnetic metals such as iron and stainless steel, and so-called electromagnetic induction heating is used. It is a thing. However, since these magnetic metals have low thermal conductivity, there is a problem that it is difficult to cook food quickly and uniformly.

このような熱伝導性の問題点を解決するために、従来、電磁誘導加熱用調理器具にアルミニウムや銅などを積層したクラッド材を用いていたが、クラッド材は鍋や釜に成型するときの絞り加工が困難であり、また表面をフッ素樹脂などで耐熱塗装した場合に、樹脂層の積層界面が剥離してしまう等の問題点があった。   In order to solve such problems of thermal conductivity, clad materials made by laminating aluminum, copper, etc. have been used in conventional electromagnetic induction heating cooking utensils. Drawing processing is difficult, and when the surface is heat-resistant coated with a fluorine resin or the like, there are problems such as peeling of the laminated interface of the resin layers.

このため従来の誘導加熱調理器では、黒鉛（グラファイト）のブロック状成型物を切削して鍋や釜などの成型品を作成した後、調理面である内面に下塗り塗料及びフッ素樹脂を塗装することにより誘導加熱用調理器具を製造していた（例えば、特許文献１参照）。この文献では、従来の鉄やステンレスなどに代わって、炊飯釜などの電磁誘導加熱用調理器具に適度な導電性と誘電性及び高い熱伝導率を有する炭素（カーボン）焼結体を用いることが提案されている。このような炭素焼結体は、コークス等の炭素含有率の高い粉粒を無酸素状態で１０００〜３０００℃に加熱して凝結させることにより得ることができる。   For this reason, in a conventional induction heating cooker, after cutting a graphite block-shaped molded product to create a molded product such as a pot or a pot, an undercoating paint and a fluororesin are applied to the inner surface which is the cooking surface. Has produced a cooking utensil for induction heating (see, for example, Patent Document 1). In this document, instead of conventional iron, stainless steel, etc., a carbon (carbon) sintered body having appropriate electrical conductivity, dielectric properties, and high thermal conductivity is used for an electromagnetic induction heating cooking utensil such as a rice cooker. Proposed. Such a carbon sintered body can be obtained by heating and condensing powder particles having a high carbon content such as coke to 1000 to 3000 ° C. in an oxygen-free state.

また従来の他の誘導加熱調理器では、棒柱状に加圧して凝縮させた炭素圧縮体を切削加工した後に、フッ素樹脂コートを施して誘導加熱用調理器具を製造し、高温での調理器具として用いていた（例えば、特許文献２参照）。
特開平９−７５２１１号公報（図４〜図７） 特開平９−７０３５２号公報（図１、図２） In another conventional induction heating cooker, after cutting a carbon compact that has been pressed and condensed into a columnar shape, a fluororesin coat is applied to produce a cooking utensil for induction heating, as a cooking utensil at high temperature (For example, refer to Patent Document 2).
JP-A-9-75211 (FIGS. 4 to 7) Japanese Patent Laid-Open No. 9-70352 (FIGS. 1 and 2)

上記のように、従来の誘導加熱調理器では（例えば、特許文献１又は特許文献２参照）コークス等の炭素を多く含む粒子を高温で焼結させた炭素凝結体を鍋状に切削加工して電磁誘導加熱用調理器具を作成しているものがあった。しかしこのような電磁誘導加熱用調理器具の作成方法では、炭素凝結体を切削加工して鍋等の形状としているため、中空部分にある炭素凝結体の多くが無駄になるという問題点があった。またコークス等からなる粒子を焼結させて炭素凝結体を作成し、それを切削するという工程が必要なため製造工程が多くなるという問題点があった。   As described above, in a conventional induction heating cooker (see, for example, Patent Document 1 or Patent Document 2), a carbon aggregate obtained by sintering particles containing a large amount of carbon such as coke at a high temperature is cut into a pan shape. Some have made cooking utensils for electromagnetic induction heating. However, in such a method of creating a cooking utensil for induction heating, there is a problem that a large amount of the carbon aggregate in the hollow portion is wasted because the carbon aggregate is cut into a shape such as a pan. . In addition, there is a problem in that the number of manufacturing steps is increased because a step of forming a carbon aggregate by sintering particles made of coke or the like and cutting it is necessary.

本発明は、炭素凝結体の無駄及び製造工程数の少ない電磁誘導加熱用調理器具の製造方法及びこの製造方法で得られた電磁誘導加熱用調理器具並びにこの電磁誘導加熱用調理器具を備えた電磁誘導加熱調理器を提供することを目的とする。   The present invention relates to a method for producing a cooking utensil for electromagnetic induction heating with less waste of carbon aggregates and a smaller number of production steps, a cooking utensil for electromagnetic induction heating obtained by this manufacturing method, and an electromagnetic device equipped with the cooking utensil for electromagnetic induction heating. An object is to provide an induction heating cooker.

本発明に係る電磁誘導加熱用調理器具の製造方法は、電磁誘導加熱用調理器具の製造方法であって、前記電磁誘導加熱用調理器具の形状を成型する成型用金型の、下金型と上金型との間を、最終的に成形を行う状態よりも開いた状態に維持する工程と、前記成型用金型内に繊維状物質を載置する工程と、炭素を含有する粉粒と、炭素を含有する液状の結合材との混合物を前記成型用金型に注入する工程と、前記成型用金型の下金型及び上金型の何れか一方を、最終的に成型を行う状態に移動させて前記混合物を加圧し、成型品を製造する工程と、該成型品を無酸素条件下で加熱して凝結させることにより凝結体を製造する工程とを有するものである。 A method for manufacturing an electromagnetic induction heating cooking utensil according to the present invention is a method for manufacturing an electromagnetic induction heating cooking utensil, wherein a molding die for molding the shape of the electromagnetic induction heating cooking utensil, A step of maintaining a space between the upper mold and a state where the molding is finally performed, a step of placing a fibrous substance in the molding die, and a powder containing carbon And a step of injecting a mixture with a liquid binder containing carbon into the molding die, and finally molding either one of the lower die and the upper die of the molding die. It pressurized the mixture is moved, and has a step of producing a molded article, and a step of manufacturing the aggregates by coagulating by heating the molded type products under anoxic conditions.

炭素を含有する粉粒と、炭素を含有する液状の結合材との混合物を成型用金型で射出成型して鍋や釜等の形状を有する成型品を製造し、これを加熱して凝結することにより電磁誘導加熱用調理器具を製造するため、切削による炭素凝結体の無駄がなくなり、製造工程数を削減することが可能となる。   A mixture of powder containing carbon and a liquid binder containing carbon is injection-molded with a molding die to produce a molded product having a shape such as a pot or a pot, and this is heated and condensed. Accordingly, since the cooking utensil for electromagnetic induction heating is manufactured, there is no waste of carbon aggregates due to cutting, and the number of manufacturing steps can be reduced.

実施形態１．
本実施形態１では、コークスの粉粒を溶融状態のタールピッチ（コールタールピッチとも呼ばれる）に混練した混合物を射出成型して成型品を製造し、この成型品を高温焼結させることにより炭素を主成分とする凝結体を製造して電磁誘導加熱用調理器具を得る方法について説明する。 Embodiment 1. FIG.
In the first embodiment, a mixture obtained by kneading coke powder particles into a molten tar pitch (also called coal tar pitch) is injection-molded to produce a molded product, and the molded product is sintered at a high temperature to produce carbon. A method for producing a cooking utensil for electromagnetic induction heating by producing a coagulated body having a main component will be described.

まず、炭素を主成分とするコークスを０．３ｍｍ以下に粉砕して粉粒とし、この粉粒を２５０℃の溶融状態にあるタールピッチと混練する。このとき炭素を主成分とするタールピッチは液状となっているが、冷却されたときに固化する結合材としての機能を有している。なおコークスの粉粒とタールピッチの混合物は、以下に示す成型用金型による成型の際に気泡が発生するのを防止するために十分混練することが望ましい。   First, coke containing carbon as a main component is pulverized to 0.3 mm or less to form powder particles, and the powder particles are kneaded with a tar pitch in a molten state at 250 ° C. At this time, the tar pitch mainly composed of carbon is in a liquid state, but has a function as a binder that solidifies when cooled. It is desirable that the mixture of coke powder and tar pitch be sufficiently kneaded in order to prevent bubbles from being generated during molding by the molding die shown below.

図１は、コークスの粉粒とタールピッチの混合物を射出成型するための成型用金型を示した縦断面図である。ここでコークスの粉粒とタールピッチの混合物は、図１に示す成型用金型によって鍋や釜の形状を有する成型品に成型される。成型用金型は、コークスの粉粒とタールピッチの混合物を固化させるためにタールピッチの融点よりも十分低い温度で、最終的に成型を行う状態よりも５ｍｍ程度開いた状態を維持する。そして混練時とほぼ同程度の温度状態でコークスの粉粒とタールピッチの混合物を注入する。このコークスの粉粒とタールピッチの混合物の注入は、注入口１から行う。なお、図１に示す成型用金型では、鍋等の形状を有する開口部の外縁に相当する鍔部２から混合物の注入を行うものとする。このとき下金型３と上金型４は５ｍｍ程度開いた状態となっているので、鍔部２も若干開いた状態にあり、混合物の注入をスムーズに行うことができる。   FIG. 1 is a longitudinal sectional view showing a molding die for injection molding a mixture of coke powder and tar pitch. Here, the mixture of the coke powder and the tar pitch is molded into a molded product having the shape of a pot or a pot by the molding die shown in FIG. The molding die is maintained at a temperature sufficiently lower than the melting point of the tar pitch to solidify the mixture of the coke powder and the tar pitch, and is opened about 5 mm from the final molding state. Then, a mixture of coke powder and tar pitch is injected at a temperature substantially equal to that during kneading. The mixture of the coke powder and the tar pitch is injected from the inlet 1. In the molding die shown in FIG. 1, the mixture is injected from the flange 2 corresponding to the outer edge of the opening having a shape such as a pan. At this time, since the lower mold 3 and the upper mold 4 are opened by about 5 mm, the flange 2 is also slightly opened, and the mixture can be injected smoothly.

成型用金型に注入されたコークスの粉粒とタールピッチの混合物は、鍋や釜の形状を有する成型品の側面部分に沿って底面部分へと流動する。そして成型用金型の中空部分に混合物が充填された後、成型用金型への熱伝導に伴って混合物が冷却されて粘度が上昇し、鍋等の形状を有する成型品となる。なお混合物の充填が完了したときに、上金型４を下方向に移動させて成型用金型を最終的に成型を行う状態にしてコークスの粉粒とタールピッチの混合物を加圧する。またこれと同時に、注入口１付近に設けたシリンダー５を閉じて注入口１を塞ぐ。このとき、注入口１に残った混合物は成型用金型の抜き穴６に押出されて、取出口７から取り除かれる。成型品は、成型用金型内で冷却されて固化した後に取り出される。   The mixture of coke powder and tar pitch injected into the molding die flows along the side surface of the molded product having the shape of a pot or a pot to the bottom surface. Then, after the hollow portion of the molding die is filled with the mixture, the mixture is cooled with heat conduction to the molding die, the viscosity increases, and the molded product has a shape such as a pan. When the filling of the mixture is completed, the upper mold 4 is moved downward so that the molding mold is finally molded, and the mixture of coke powder and tar pitch is pressurized. At the same time, the cylinder 5 provided near the inlet 1 is closed to close the inlet 1. At this time, the mixture remaining in the injection port 1 is extruded into the punching hole 6 of the molding die and removed from the outlet 7. The molded product is taken out after being cooled and solidified in the molding die.

混合物の充填が最も遅い成型品の底面部分では、混合物の流動時の冷却に伴って粘度が高くなり、混合物への圧力付加が非常に小さくなる。このままの状態で成型品に凝結処理を行って凝結体を製造した場合、注入口１に近い鍔の部分に比べて底面部分の密度が低くなり、この部分の曲げ強度が低下して割れが生じやすくなる。しかし本実施形態１に係る電磁誘導加熱用調理器具の製造方法では、成型用金型を５ｍｍ程度開いた状態で閉塞して混合物を注入しているため、成型品の鍔の部分と底面部分に適度な圧力を付加することができ、また過度な空隙をなくして密な状態を維持することができる。このため表１に示すように、電磁誘導加熱用調理器具の底面部分の曲げ強度を上げて、割れが発生するのを防止することが可能となっている。

Figure 0004448480
In the bottom portion of the molded product with the slowest filling of the mixture, the viscosity increases as the mixture flows during cooling, and the pressure applied to the mixture becomes very small. If a molded product is produced by subjecting the molded product to a condensing state as it is, the density of the bottom surface portion is lower than that of the heel portion close to the inlet 1 and the bending strength of this portion is lowered, resulting in cracking. It becomes easy. However, in the method of manufacturing a cooking utensil for electromagnetic induction heating according to the first embodiment, the mixture is injected by closing the molding die in an opened state of about 5 mm, so that it is applied to the heel part and the bottom part of the molded product. Appropriate pressure can be applied, and a dense state can be maintained without excessive voids. For this reason, as shown in Table 1, it is possible to prevent the occurrence of cracks by increasing the bending strength of the bottom portion of the electromagnetic induction heating cooking utensil.
Figure 0004448480

図１に示す成型用金型で射出成型された成型品は、コークスの粉粒とタールピッチの混合物に含まれる不純物を取り除いて炭素（カーボン）粒子を凝結させる必要がある。このため、成型物の周辺にコークス等の酸素を排除する充填剤を充填した加熱炉などを用いて、無酸素条件下で凝結（焼結）させる。このとき、成型品が変形しないように充填剤で成型品を覆うようにし、加熱炉は密閉状態として加熱する。凝結処理は、成型品が凝結するときに不純物が飛散したり結晶形態の転移時の収縮に伴って応力が残存しないように、１〜５℃／ｈｒの速度で昇温、降温を行い、１０００〜３０００℃で処理を行う。これにより、鍋等の形状を有する炭素を主成分とした凝縮体が得られる。   The molded product injection-molded with the molding die shown in FIG. 1 needs to remove impurities contained in a mixture of coke powder and tar pitch and condense carbon particles. For this reason, it is condensed (sintered) under oxygen-free conditions using a heating furnace or the like in which a filler such as coke is excluded around the molded product. At this time, the molded product is covered with a filler so that the molded product is not deformed, and the heating furnace is heated in a sealed state. In the condensation treatment, the temperature is raised and lowered at a rate of 1 to 5 ° C./hr so that no impurities are scattered when the molded product is condensed or no stress remains with the shrinkage at the transition of the crystal form. Process at ~ 3000 ° C. Thereby, the condensate which has carbon which has shapes, such as a pan, as a main component is obtained.

本実施形態１では、凝結体を作成した後に旋盤等を用いて切削加工を行う必要がないので、０．３〜１．０時間を要していた切削加工時間を削減することができる。またタールピッチは成型に都合のよい２００〜３００℃の融点を有しており、焼成による不純物の飛散が少ないため、高温で成型品が凝結する際に不純物の飛散を原因とする収縮が起こりにくく、昇降温時の応力の残留を抑制することができる。   In this Embodiment 1, since it is not necessary to cut using a lathe etc. after producing a condensate, the cutting time which required 0.3 to 1.0 hour can be reduced. In addition, tar pitch has a melting point of 200 to 300 ° C. that is convenient for molding, and since there is little scattering of impurities due to firing, shrinkage due to scattering of impurities is unlikely to occur when molded products condense at high temperatures. In addition, it is possible to suppress the residual stress during the temperature rise and fall.

その後、以上の工程で作成された炭素を主成分とする凝縮体の表面に、調理物等の付着を防止するためのフッ素樹脂の塗装を施す。上記の凝結体は、主成分とする炭素の粉粒が多くの鋭角を備えた多角形を形成しており、互いの粉粒の接触部分が極めて小さくなっている。このため、表面層の引っ掻きや摩耗に対する耐性が低く、調理器具として用いるためにその表面を改質する塗装を行う必要がある。また、樹脂層と接触する凝結体の表面も同様の状態となっており、樹脂層が剥離したときに凝結体の表面も破壊されるため、同時に剥離耐性を向上させる処理を行う必要がある。   Thereafter, a fluororesin coating is applied to the surface of the condensate containing carbon as a main component prepared in the above steps in order to prevent adhesion of cooked food or the like. In the aggregate, the carbon particles as the main component form a polygon having many acute angles, and the contact portions of the powder particles are extremely small. For this reason, the surface layer has low resistance to scratching and abrasion, and it is necessary to perform coating for modifying the surface for use as a cooking utensil. Further, the surface of the aggregate in contact with the resin layer is in the same state, and when the resin layer is peeled off, the surface of the aggregate is also destroyed, so that it is necessary to perform a treatment for improving the peel resistance at the same time.

このため本実施形態１では、煮物調理に耐えられる温度、具体的には１５０℃を上限とした耐熱性を備えた樹脂で、凝結体との接触部分を補強することを目的として剥離耐性を向上させる処理を行った。まず、凝結体表面にＰＥＳ（ポリエーテルサルフォン）微粉末と安定分散を確保する界面活性剤を含む分散液（液状樹脂）をスプレーで塗布し、１５０℃の温度で１０分間乾燥させる。そして、ＰＦＡ（テトラフルオロエチレン・パーフルオロアルキルビニエーテル共重合体、フッ素樹脂を含む）及びＰＥＳの微粉末を含んだ樹脂混合溶液をスプレーで塗布し、１５０℃の温度で１０分間乾燥させる。   For this reason, in this Embodiment 1, the temperature which can endure boiled cooking, specifically, the resin provided with heat resistance up to 150 ° C., and the peel resistance is improved for the purpose of reinforcing the contact portion with the aggregate. The processing to be performed was performed. First, a dispersion (liquid resin) containing a fine PES (polyethersulfone) powder and a surfactant that ensures stable dispersion is applied to the surface of the aggregate by spraying, and dried at a temperature of 150 ° C. for 10 minutes. A resin mixed solution containing fine powder of PFA (including tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer and fluororesin) and PES is applied by spraying and dried at a temperature of 150 ° C. for 10 minutes.

スプレーによる分散液及び樹脂混合溶液の塗布は、凝結体表面から樹脂混合溶液が吸収されて凝結体の内部に気泡が発生することのないよう、十分な時間間隔をおいて行うのが望ましい。それから、凝結体表面に樹脂混合溶液が吸収されずに滞留した状態で塗布を完了し、樹脂混合溶液が乾燥しきる前にＰＦＡの粉末を塗布する。その後、凝結体を３４０〜４００℃に加熱することにより乾燥及び溶融を行って、凝結体の表面改質と塗装が完了する。これにより、凝結体の最外面に樹脂塗装面が形成される。   It is desirable to apply the dispersion liquid and the resin mixed solution by spraying at a sufficient time interval so that the resin mixed solution is not absorbed from the surface of the aggregate and bubbles are not generated inside the aggregate. Then, the application is completed in a state where the resin mixed solution stays on the aggregate surface without being absorbed, and the PFA powder is applied before the resin mixed solution is completely dried. Then, the aggregate is dried and melted by heating to 340 to 400 ° C. to complete the surface modification and coating of the aggregate. Thereby, the resin coating surface is formed on the outermost surface of the aggregate.

なお凝結体の加熱は、樹脂の塗装された面の反対面から行うことが望ましい。これは、ＰＦＡの粉末が凝縮体の下部から溶融して気泡が残留し、調理時等に膨れが発生するのを防止するためである。この加熱により、まず樹脂混合溶液中の水分が蒸発し、その後ＰＥＳが溶融して凝縮体表面に含浸し、凝結体と樹脂層の接触部を覆うようにして凝縮体表面を補強する。それから融点の高いＰＦＡが溶融するが、分散液中のＰＥＳと樹脂混合溶液中のＰＥＳ、及び樹脂混合溶液中のＰＦＡと最後に塗布したＰＦＡの粉末が融着して結合するため強固な樹脂塗装を行うことができる。   It is desirable to heat the aggregate from the surface opposite to the resin-coated surface. This is to prevent PFA powder from melting from the lower part of the condensate, leaving bubbles and causing blistering during cooking. By this heating, the water in the resin mixed solution is first evaporated, and then the PES is melted and impregnated on the surface of the condensate to reinforce the condensate surface so as to cover the contact portion between the aggregate and the resin layer. Then, PFA with a high melting point melts, but the PES in the dispersion, the PES in the resin mixed solution, and the PFA in the resin mixed solution and the last applied PFA powder are fused and bonded, so that the resin coating is strong. It can be performed.

上記の樹脂塗装の剥離耐性について、５ｍｍ間隔の升目状にこの塗装を施した試験片を用いて検査を行った。なおこの検査は、試験片に粘着テープを密着させて剥離したときの樹脂層の剥離状態を見るものである。その結果、樹脂混合溶液を塗布せずＰＦＡのみを塗布したものが６０〜８５％の保持率であったのに対して、本実施形態１に係る樹脂塗装を行ったものは全く剥離を生じることがなく、剥離耐性が大幅に改善されていることを確認した。   The peeling resistance of the above-mentioned resin coating was inspected using a test piece having this coating applied in a grid shape with an interval of 5 mm. In this inspection, the peeled state of the resin layer is observed when the adhesive tape is brought into close contact with the test piece and peeled off. As a result, the retention rate of 60 to 85% was obtained by applying only PFA without applying the resin mixed solution, whereas the resin coating according to the first embodiment caused peeling at all. It was confirmed that the peel resistance was greatly improved.

本実施形態１では、炭素を含有する粉粒と、炭素を含有する液状の結合材との混合物を成型用金型で射出成型して鍋や釜等の形状を有する成型品を製造し、これを加熱して凝結することにより電磁誘導加熱用調理器具を製造するため、切削による炭素凝結体の無駄がなくなり、製造工程数を削減することができる。また凝結体に液状樹脂を含浸し、フッ素樹脂を含有する樹脂塗装面を形成するため、樹脂塗装面の剥離耐性を大幅に向上することができる。なお、炭素を含有する液状の結合材としてフェノール樹脂も考えられるが、タールピッチ溶融物はカーボンの含有率が多いので、高温で処理する際に飛散する量が少ないため、好適である。   In the first embodiment, a mixture of powder containing carbon and a liquid binder containing carbon is injection-molded with a molding die to produce a molded product having a shape such as a pan or a pot. Since the cooking utensils for electromagnetic induction heating are manufactured by heating and condensing, the carbon condensate is not wasted by cutting, and the number of manufacturing steps can be reduced. Further, since the aggregate is impregnated with a liquid resin to form a resin-coated surface containing a fluororesin, the peeling resistance of the resin-coated surface can be greatly improved. In addition, although the phenol resin can also be considered as a liquid binder containing carbon, since the tar pitch melt has a high carbon content, it is preferable because it is less scattered when processed at a high temperature.

実施形態２．
本実施形態２では、コークスの粉粒を溶融状態のタールピッチに混練した混合物に、さらに磁性金属からなる繊維を混練したものを射出成型して成型品を製造し、この成型品を高温焼結させることにより炭素を主成分とする凝結体を製造して電磁誘導加熱用調理器具を得る方法について説明する。 Embodiment 2. FIG.
In the second embodiment, a mixture obtained by kneading coke powder into a molten tar pitch and further kneading fibers made of magnetic metal is manufactured by injection molding to produce a molded product, and this molded product is sintered at high temperature. A method for producing a condensate containing carbon as a main component to obtain a cooking utensil for electromagnetic induction heating will be described.

まず、炭素を主成分とするコークスを０．３ｍｍ以下に粉砕して粉粒とし、この粉粒を２５０℃の溶融状態にあるタールピッチと混練し、さらに１ｍｍ以下の鉄繊維を３０重量％混練する。このとき炭素を主成分とするタールピッチは液状となっているが、冷却されたときに固化する結合材としての機能を有している。なおコークスの粉粒、タールピッチ及び鉄繊維の混合物は、以下に示す成型用金型による成型の際に気泡が発生するのを防止するために十分混練することが望ましい。また本実施形態２では、磁性金属からなる金属として鉄繊維を使用しているが、他の磁性金属からなる繊維を使用してもよい。   First, coke containing carbon as a main component is pulverized to 0.3 mm or less to form particles, which are kneaded with a tar pitch in a molten state at 250 ° C., and further, 30% by weight of iron fiber of 1 mm or less is kneaded. To do. At this time, the tar pitch mainly composed of carbon is in a liquid state, but has a function as a binder that solidifies when cooled. In addition, it is desirable to sufficiently knead the mixture of coke powder, tar pitch and iron fiber in order to prevent bubbles from being generated during molding by the molding die shown below. Moreover, in this Embodiment 2, although the iron fiber is used as a metal which consists of magnetic metals, you may use the fiber which consists of another magnetic metal.

本実施形態２では、実施形態１と同様にコークスの粉粒、タールピッチ及び鉄繊維の混合物を、図１に示す成型用金型によって鍋や釜の形状を有する成型品に成型する。成型用金型は、コークスの粉粒とタールピッチの混合物を固化させるためにタールピッチの融点よりも十分低い温度（例えば、８０℃）で、最終的に成型を行う状態よりも２ｍｍ程度開いた状態を維持する。そして混練時とほぼ同程度の温度状態でコークスの粉粒、タールピッチ及び鉄繊維の混合物を注入する。このとき下金型３と上金型４は２ｍｍ程度開いた状態となっているので、鍔部２も若干開いた状態にあり、混合物の注入をスムーズに行うことができる。   In the second embodiment, as in the first embodiment, a mixture of coke granule, tar pitch and iron fiber is molded into a molded product having the shape of a pan or a pot using the molding die shown in FIG. The mold for molding was opened at a temperature sufficiently lower than the melting point of the tar pitch (for example, 80 ° C.) in order to solidify the mixture of the coke powder and the tar pitch, and opened about 2 mm from the final molding state. Maintain state. Then, a mixture of coke powder, tar pitch, and iron fiber is injected at a temperature substantially the same as that during kneading. At this time, since the lower mold 3 and the upper mold 4 are opened by about 2 mm, the flange 2 is also slightly opened, and the mixture can be injected smoothly.

成型用金型に注入されたコークスの粉粒、タールピッチ及び鉄繊維の混合物は、鍋や釜の形状を有する成型品の側面部分に沿って底面部分へと流動する。そして成型用金型の中空部分に混合物が充填された後、成型用金型への熱伝導に伴って混合物が冷却されて粘度が上昇し、鍋等の形状を有する成型品となる。なお実施形態１と同様に、混合物の充填が完了したときに、上金型４を下方向に移動させて成型用金型を最終的に成型を行う状態にしてコークスの粉粒、タールピッチ及び鉄繊維の混合物を加圧する。またこれと同時に、注入口１付近に設けたシリンダー５を閉じて注入口１を塞ぐ。このとき、注入口１に残った混合物は成型用金型の抜き穴６に押出されて、取出口７から取り除かれる。成型品は、成型用金型内で冷却されて固化した後に取り出される。   The mixture of coke granule, tar pitch and iron fiber injected into the molding die flows along the side part of the molded product having the shape of a pot or a pot to the bottom part. After the hollow portion of the molding die is filled with the mixture, the mixture is cooled with heat conduction to the molding die, the viscosity increases, and the molded product has a shape such as a pan. As in the first embodiment, when the filling of the mixture is completed, the upper mold 4 is moved downward so that the molding mold is finally molded, and coke powder particles, tar pitch and Pressurize the iron fiber mixture. At the same time, the cylinder 5 provided near the inlet 1 is closed to close the inlet 1. At this time, the mixture remaining in the injection port 1 is extruded into the punching hole 6 of the molding die and removed from the outlet 7. The molded product is taken out after being cooled and solidified in the molding die.

混合物の充填が最も遅い成型品の底面部分では、混合物の流動時の冷却に伴って粘度が高くなり、混合物への圧力付加が非常に小さくなる。このままの状態で成型品に凝結処理を行って凝結体を製造した場合、注入口１に近い鍔の部分に比べて底面部分の密度が低くなり、この部分の曲げ強度が低下して割れが生じやすくなる。しかし本実施形態２に係る電磁誘導加熱用調理器具の製造方法では、成型用金型を２ｍｍ程度開いた状態で閉塞して混合物を注入しているため、成型品の鍔の部分と底面部分に適度な圧力を付加することができ、また過度な空隙をなくして密な状態を維持することができる。このため、電磁誘導加熱用調理器具の底面部分の曲げ強度を上げて、割れが発生するのを防止することが可能となっている。   In the bottom portion of the molded product with the slowest filling of the mixture, the viscosity increases as the mixture flows during cooling, and the pressure applied to the mixture becomes very small. If a molded product is produced by subjecting the molded product to a condensing state as it is, the density of the bottom surface portion is lower than that of the heel portion close to the inlet 1 and the bending strength of this portion is lowered, resulting in cracking. It becomes easy. However, in the method of manufacturing a cooking utensil for electromagnetic induction heating according to the second embodiment, the mixture is injected by closing the molding die in an opened state of about 2 mm. Appropriate pressure can be applied, and a dense state can be maintained without excessive voids. For this reason, it is possible to increase the bending strength of the bottom surface portion of the electromagnetic induction heating cooking utensil and prevent the occurrence of cracks.

図１に示す成型用金型で射出成型された成型品は、コークスの粉粒、タールピッチ及び鉄繊維の混合物に含まれる不純物を取り除いて炭素（カーボン）粒子を凝結させる必要がある。このため、成型物の周辺にコークス等の酸素を排除する充填剤を充填した加熱炉などを用いて、無酸素条件下で凝結（焼結）させる。このとき、成型品が変形しないように充填剤で成型品を覆うようにし、加熱炉は密閉状態として加熱する。凝結処理は、成型品が凝結するときに不純物が飛散したり結晶形態の転移時の収縮に伴って応力が残存しないように、１〜５℃／ｈｒの速度で昇温、降温を行い、１０００〜３０００℃で処理を行う。これにより、鍋等の形状を有する炭素及び鉄繊維を主成分とした凝縮体が得られる。   The molded product injection-molded with the molding die shown in FIG. 1 needs to remove impurities contained in a mixture of coke powder, tar pitch and iron fiber to condense carbon particles. For this reason, it is condensed (sintered) under oxygen-free conditions using a heating furnace or the like in which a filler such as coke is excluded around the molded product. At this time, the molded product is covered with a filler so that the molded product is not deformed, and the heating furnace is heated in a sealed state. In the condensation treatment, the temperature is raised and lowered at a rate of 1 to 5 ° C./hr so that no impurities are scattered when the molded product is condensed or no stress remains with the shrinkage at the transition of the crystal form. Process at ~ 3000 ° C. Thereby, the condensate which has carbon and iron fiber which have shapes, such as a pan, as a main component is obtained.

本実施形態２においても、凝結体を作成した後に旋盤等を用いて切削加工を行う必要がないので、０．３〜１．０時間を要していた切削加工時間を削減することができる。またタールピッチは成型に都合のよい２００〜３００℃の融点を有しており、焼成による不純物の飛散が少ないため、高温で成型品が凝結する際に不純物の飛散を原因とする収縮が起こりにくく、昇降温時の応力の残留を抑制することができる。   Also in the second embodiment, since it is not necessary to perform cutting using a lathe after creating the aggregate, it is possible to reduce the cutting time that required 0.3 to 1.0 hour. In addition, tar pitch has a melting point of 200 to 300 ° C. which is convenient for molding, and since there is little scattering of impurities due to firing, shrinkage caused by scattering of impurities is difficult to occur when the molded product condenses at high temperatures. In addition, it is possible to suppress the residual stress during the temperature rise and fall.

その後、以上の工程で作成された炭素及び鉄繊維を主成分とする凝縮体の表面に、調理物等の付着を防止するためのフッ素樹脂の塗装を施す。上記の凝結体は、主成分とする炭素の粉粒が多くの鋭角を備えた多角形を形成しており、互いの粉粒の接触部分が極めて小さくなっている。このため、表面層の引っ掻きや摩耗に対する耐性が低く、調理器具として用いるためにその表面を改質する塗装を行う必要がある。また、樹脂層と接触する凝結体の表面も同様の状態となっており、樹脂層が剥離したときに凝結体の表面も破壊されるため、同時に剥離耐性を向上させる処理を行う必要がある。   Thereafter, the surface of the condensate mainly composed of carbon and iron fibers prepared in the above steps is coated with a fluororesin for preventing adhesion of cooked food or the like. In the aggregate, the carbon particles as the main component form a polygon having many acute angles, and the contact portions of the powder particles are extremely small. For this reason, the surface layer has low resistance to scratching and abrasion, and it is necessary to perform coating for modifying the surface for use as a cooking utensil. Further, the surface of the aggregate in contact with the resin layer is in the same state, and when the resin layer is peeled off, the surface of the aggregate is also destroyed, so that it is necessary to perform a treatment for improving the peel resistance at the same time.

このため本実施形態２でも、煮物調理に耐えられる温度、具体的には１５０℃を上限とした耐熱性を備えた樹脂で、凝結体との接触部分を補強することを目的として剥離耐性を向上させる処理を行った。まず、凝結体表面にＰＥＳ（ポリエーテルサルフォン）微粉末と安定分散を確保する界面活性剤を含む分散液（液状樹脂）をスプレーで塗布し、１５０℃の温度で１０分間乾燥させる。そして、ＰＦＡ（テトラフルオロエチレン・パーフルオロアルキルビニエーテル共重合体、フッ素樹脂を含む）及びＰＥＳの微粉末を含んだ樹脂混合溶液をスプレーで塗布し、１５０℃の温度で１０分間乾燥させる。   For this reason, even in the second embodiment, a temperature that can withstand boiled cooking, specifically, a resin having heat resistance up to 150 ° C. is used, and the peel resistance is improved for the purpose of reinforcing the contact portion with the aggregate. The processing to be performed was performed. First, a dispersion (liquid resin) containing a fine PES (polyethersulfone) powder and a surfactant that ensures stable dispersion is applied to the surface of the aggregate by spraying, and dried at a temperature of 150 ° C. for 10 minutes. A resin mixed solution containing fine powder of PFA (including tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer and fluororesin) and PES is applied by spraying and dried at a temperature of 150 ° C. for 10 minutes.

スプレーによる分散液及び樹脂混合溶液の塗布は、凝結体表面から樹脂混合溶液が吸収されて凝結体の内部に気泡が発生することのないよう、十分な時間間隔をおいて行うのが望ましい。それから、凝結体表面に樹脂混合溶液が吸収されずに滞留した状態で塗布を完了し、樹脂混合溶液が乾燥しきる前にＰＦＡの粉末を塗布する。その後、凝結体を３４０〜４００℃に加熱することにより乾燥及び溶融を行って、凝結体の表面改質と塗装が完了する。これにより、凝結体の最外面に樹脂塗装面が形成される。   It is desirable to apply the dispersion liquid and the resin mixed solution by spraying at a sufficient time interval so that the resin mixed solution is not absorbed from the surface of the aggregate and bubbles are not generated inside the aggregate. Then, the application is completed in a state where the resin mixed solution stays on the aggregate surface without being absorbed, and the PFA powder is applied before the resin mixed solution is completely dried. Then, the aggregate is dried and melted by heating to 340 to 400 ° C. to complete the surface modification and coating of the aggregate. Thereby, the resin coating surface is formed on the outermost surface of the aggregate.

なお凝結体の加熱は、樹脂の塗装された面の反対面から行うことが望ましい。これは、ＰＦＡの粉末が凝縮体の下部から溶融して気泡が残留し、調理時等に膨れが発生するのを防止するためである。この加熱により、まず樹脂混合溶液中の水分が蒸発し、その後ＰＥＳが溶融して凝縮体表面に含浸し、凝結体と樹脂層の接触部を覆うようにして凝縮体表面を補強する。それから融点の高いＰＦＡが溶融するが、分散液中のＰＥＳと樹脂混合溶液中のＰＥＳ、及び樹脂混合溶液中のＰＦＡと最後に塗布したＰＦＡの粉末が融着して結合するため強固な樹脂塗装を行うことができる。   It is desirable to heat the aggregate from the surface opposite to the resin-coated surface. This is to prevent PFA powder from melting from the lower part of the condensate, leaving bubbles and causing blistering during cooking. By this heating, the water in the resin mixed solution is first evaporated, and then the PES is melted and impregnated on the surface of the condensate to reinforce the condensate surface so as to cover the contact portion between the aggregate and the resin layer. Then, PFA with a high melting point melts, but the PES in the dispersion, the PES in the resin mixed solution, and the PFA in the resin mixed solution and the last applied PFA powder are fused and bonded, so that the resin coating is strong. It can be performed.

上記の樹脂塗装の剥離耐性について、５ｍｍ間隔の升目状にこの塗装を施した試験片を用いて検査を行った。なおこの検査は、試験片に粘着テープを密着させて剥離したときの樹脂層の剥離状態を見るものである。その結果、樹脂混合溶液を塗布せずＰＦＡのみを塗布したものが６０〜８５％の保持率であったのに対して、本実施形態２に係る樹脂塗装を行ったものは全く剥離を生じることがなく、剥離耐性が大幅に改善されていることを確認した。また、本実施形態２では、原料となる混合物に鉄繊維を混練したことによって、電磁誘導加熱の効率を低下させることなく、表２に示すような曲げ強度の向上を行うことができた。

Figure 0004448480
The peeling resistance of the above-mentioned resin coating was inspected using a test piece having this coating applied in a grid shape with an interval of 5 mm. In this inspection, the peeled state of the resin layer is observed when the adhesive tape is brought into close contact with the test piece and peeled off. As a result, the retention rate of 60 to 85% was obtained by applying only PFA without applying the resin mixed solution, whereas the resin coating according to the second embodiment was completely peeled off. It was confirmed that the peel resistance was greatly improved. Moreover, in this Embodiment 2, the bending strength as shown in Table 2 was able to be improved, without reducing the efficiency of electromagnetic induction heating, by kneading iron fiber with the mixture used as a raw material.
Figure 0004448480

なお上記のように、原料となる混合物にステンレスやカーボンからなる繊維を混練するようにしてもよい。また、磁性金属からなる繊維の長さは混合物の流動性に影響するが、成型品や成型用金型の形状等を考慮して適当な長さの繊維を用いることができる。さらに、磁性金属でないため電磁誘導加熱には寄与しないが強度や摩耗性を改善するために、柔軟で炭素と結合しやすいシリカ（ＳｉＯ2）からなる繊維を混練するようにしてもよい。 As described above, fibers made of stainless steel or carbon may be kneaded into the mixture as a raw material. Further, the length of the fiber made of magnetic metal affects the fluidity of the mixture, but an appropriate length of fiber can be used in consideration of the shape of a molded product or a molding die. Furthermore, since it is not a magnetic metal, it does not contribute to electromagnetic induction heating, but in order to improve strength and wear, fibers made of silica (SiO 2 ) that is flexible and easily bonded to carbon may be kneaded.

本実施形態２では、コークスの粉粒を溶融状態のタールピッチに混練した混合物に、さらに磁性金属からなる繊維を混練しているため、電磁誘導加熱の効率を下げることなく、電磁誘導加熱用調理器具の強度を向上することができる。なお、その他の効果については実施形態１に係る電磁誘導加熱用調理器具の製造方法と同様である。   In the second embodiment, since a fiber made of a magnetic metal is further kneaded into a mixture obtained by kneading coke powder into a molten tar pitch, electromagnetic induction heating cooking is performed without reducing the efficiency of electromagnetic induction heating. The strength of the instrument can be improved. In addition, about another effect, it is the same as that of the manufacturing method of the cooking utensil for electromagnetic induction heating which concerns on Embodiment 1. FIG.

実施形態３．
本実施形態３では、コークスの粉粒を溶融状態のタールピッチに混練した混合物を、磁性金属からなる繊維状物質を載置した成型用金型で射出成型して成型品を製造し、この成型品を高温焼結させることにより、表面が磁性金属からなる繊維状物質で強化された凝結体を製造して電磁誘導加熱用調理器具を得る方法について説明する。 Embodiment 3. FIG.
In the third embodiment, a mixture obtained by kneading coke powder particles in a molten tar pitch is injection-molded with a molding die on which a fibrous substance made of a magnetic metal is placed, and a molded product is manufactured. A method for producing a cookware for electromagnetic induction heating by producing a coagulated body whose surface is reinforced with a fibrous material made of a magnetic metal by sintering the product at a high temperature will be described.

まず、炭素を主成分とするコークスを０．１ｍｍ以下に粉砕して粉粒とし、この粉粒を２５０℃の溶融状態にあるタールピッチ（融点が約２００℃）と混練する。このとき炭素を主成分とするタールピッチは液状となっているが、冷却されたときに固化する結合材としての機能を有している。なおコークスの粉粒とタールピッチの混合物は、以下に示す成型用金型による成型の際に気泡が発生するのを防止するために十分混練することが望ましい。   First, coke containing carbon as a main component is pulverized to 0.1 mm or less to form powder particles, and the powder particles are kneaded with a tar pitch (melting point: about 200 ° C.) in a molten state at 250 ° C. At this time, the tar pitch mainly composed of carbon is in a liquid state, but has a function as a binder that solidifies when cooled. It is desirable that the mixture of coke powder and tar pitch be sufficiently kneaded in order to prevent bubbles from being generated during molding by the molding die shown below.

図２は、コークスの粉粒とタールピッチの混合物を射出成型するための成型用金型を示した縦断面図である。ここでコークスの粉粒とタールピッチの混合物は、図２に示す成型用金型によって鍋や釜の形状を有する成型品に成型される。なお本実施形態３では、混合物を成型用金型に注入する前に、金型内の成型品の内面に相当する位置に鉄を不織布状に成型した繊維状物質を載置した。なお繊維状物質は、必ずしも不織布状でなくてもよく、磁性金属の長繊維からなるマット状のものを使用することができる。成型用金型は、コークスの粉粒とタールピッチの混合物を固化させるためにタールピッチの融点よりも十分低い温度（例えば、６０℃）で、最終的に成型を行う状態よりも５ｍｍ程度開いた状態を維持する。そして混練時よりも高い２８０℃の温度状態で、コークスの粉粒とタールピッチの混合物を注入する。なお本実施形態２で使用する成型用金型は、図２に示すように成型品の底面側が上になっており、上金型４に設けられた注入口１から混合物の注入を行うようになっている。また実施形態１に係る成型用金型と同様に、混合物の注入が完了したときに注入口１を塞ぐシリンダー５が設けられている。   FIG. 2 is a longitudinal sectional view showing a molding die for injection molding a mixture of coke powder and tar pitch. Here, the mixture of coke powder and tar pitch is formed into a molded product having the shape of a pot or a pot by a molding die shown in FIG. In the third embodiment, before injecting the mixture into the molding die, a fibrous material obtained by molding iron into a nonwoven fabric is placed at a position corresponding to the inner surface of the molded product in the die. The fibrous material does not necessarily have to be a nonwoven fabric, and a mat-like material made of long magnetic metal fibers can be used. The mold for molding was opened at a temperature sufficiently lower than the melting point of the tar pitch (for example, 60 ° C.) to solidify the mixture of the coke powder and the tar pitch, and opened about 5 mm from the final molding state. Maintain state. Then, a mixture of coke powder and tar pitch is injected at a temperature of 280 ° C., which is higher than that during kneading. Note that the molding die used in the second embodiment is such that the bottom side of the molded product is up as shown in FIG. 2, and the mixture is injected from the inlet 1 provided in the upper die 4. It has become. Further, similarly to the molding die according to the first embodiment, a cylinder 5 that closes the injection port 1 when the injection of the mixture is completed is provided.

このとき混合物の温度を混練時よりも高く設定しており、また下金型３と上金型４は５ｍｍ程度開いた状態となっているので、鍔部２も若干開いた状態にあり、混合物の注入をスムーズに行うことができる。さらに、混合物を成型用金型の上部に設けられた注入口１から注入しているため、成型品の側面部分に沿って鍔部２へと混合物が流動し、鉄からなる繊維状物質に過度な剪断力を与えることがなく、繊維状物質が変形するのを防止することができる。   At this time, the temperature of the mixture is set higher than that at the time of kneading, and the lower mold 3 and the upper mold 4 are opened by about 5 mm, so that the flange 2 is also slightly opened. Can be smoothly injected. Further, since the mixture is injected from the injection port 1 provided at the upper part of the molding die, the mixture flows along the side surface portion of the molded product to the flange portion 2 and excessively increases in the fibrous material made of iron. It is possible to prevent the fibrous material from being deformed without imparting a shearing force.

そして成型用金型の中空部分に混合物が充填された後、成型用金型への熱伝導に伴って混合物が冷却されて粘度が上昇し、鍋等の形状を有する成型品となる。なお混合物の充填が完了したときに、上金型４を下方向に移動させて成型用金型を最終的に成型を行う状態にしてコークスの粉粒とタールピッチの混合物を加圧する。またこれと同時に、注入口１付近に設けたシリンダー５を閉じて注入口１を塞ぐ。このとき、注入口１に残った混合物は成型用金型の抜き穴６に押出されて、取出口７から取り除かれる。成型品は、成型用金型内で冷却されて固化した後に取り出される。このようにして作成された成型品は、鉄からなる繊維状物質に混合物が含浸して複合化し、繊維状物質が成型品の外面と一体化した複合状態となっている。   After the hollow portion of the molding die is filled with the mixture, the mixture is cooled with heat conduction to the molding die, the viscosity increases, and the molded product has a shape such as a pan. When the filling of the mixture is completed, the upper mold 4 is moved downward so that the molding mold is finally molded, and the mixture of coke powder and tar pitch is pressurized. At the same time, the cylinder 5 provided near the inlet 1 is closed to close the inlet 1. At this time, the mixture remaining in the injection port 1 is extruded into the punching hole 6 of the molding die and removed from the outlet 7. The molded product is taken out after being cooled and solidified in the molding die. The molded product thus created is in a composite state in which a fibrous material made of iron is impregnated with a mixture to form a composite, and the fibrous material is integrated with the outer surface of the molded product.

図２に示す成型用金型で射出成型された成型品は、コークスの粉粒とタールピッチの混合物に含まれる不純物を取り除いて炭素（カーボン）粒子を凝結させる必要がある。このため、成型物の周辺にコークス等の酸素を排除する充填剤を充填した加熱炉などを用いて、無酸素条件下で凝結（焼結）させる。このとき、成型品が変形しないように充填剤で成型品を覆うようにし、加熱炉は密閉状態として加熱する。凝結処理は、成型品が凝結するときに不純物が飛散したり結晶形態の転移時の収縮に伴って応力が残存しないように、１〜５℃／ｈｒの速度で昇温、降温を行い、１０００〜３０００℃で処理を行う。これにより、繊維状物質と複合化した凝縮体が得られる。   The molded product injection-molded with the molding die shown in FIG. 2 needs to remove impurities contained in a mixture of coke powder and tar pitch and condense carbon particles. For this reason, it is condensed (sintered) under oxygen-free conditions using a heating furnace or the like in which a filler such as coke is excluded around the molded product. At this time, the molded product is covered with a filler so that the molded product is not deformed, and the heating furnace is heated in a sealed state. In the condensation treatment, the temperature is raised and lowered at a rate of 1 to 5 ° C./hr so that no impurities are scattered when the molded product is condensed or no stress remains with the shrinkage at the transition of the crystal form. Process at ~ 3000 ° C. Thereby, the condensate compounded with the fibrous substance is obtained.

本実施形態３では、凝結体を作成した後に旋盤等を用いて切削加工を行う必要がないので、０．３〜１．０時間を要していた切削加工時間を削減することができる。またタールピッチは成型に都合のよい２００〜３００℃の融点を有しており、焼成による不純物の飛散が少ないため、高温で成型品が凝結する際に不純物の飛散を原因とする収縮が起こりにくく、昇降温時の応力の残留を抑制することができる。さらに、凝縮体の最外層に形成した混合物と繊維状物質の複合体は剛性が高く、凝縮体表面の耐摩耗性を大幅に向上することができ、引っ掻き等の損傷を防止することが可能となる。   In this Embodiment 3, since it is not necessary to cut using a lathe etc. after producing a condensate, the cutting time which required 0.3 to 1.0 hour can be reduced. In addition, tar pitch has a melting point of 200 to 300 ° C. which is convenient for molding, and since there is little scattering of impurities due to firing, shrinkage caused by scattering of impurities is difficult to occur when the molded product condenses at high temperatures. In addition, it is possible to suppress the residual stress during the temperature rise and fall. Furthermore, the composite of the mixture and fibrous material formed in the outermost layer of the condensate has high rigidity, can greatly improve the wear resistance of the condensate surface, and can prevent damage such as scratching. Become.

その後、以上の工程で作成された炭素を主成分とする凝縮体の表面に、調理物等の付着を防止するためのフッ素樹脂の塗装を施す。上記の凝結体は、主成分とする炭素の粉粒が多くの鋭角を備えた多角形を形成しており、互いの粉粒の接触部分が極めて小さくなっている。このため、表面層の引っ掻きや摩耗に対する耐性が低く、調理器具として用いるためにその表面を改質する塗装を行う必要がある。また、樹脂層と接触する凝結体の表面も同様の状態となっており、樹脂層が剥離したときに凝結体の表面も破壊されるため、同時に剥離耐性を向上させる処理を行う必要がある。   Thereafter, a fluororesin coating is applied to the surface of the condensate containing carbon as a main component prepared in the above steps in order to prevent adhesion of cooked food or the like. In the aggregate, the carbon particles as the main component form a polygon having many acute angles, and the contact portions of the powder particles are extremely small. For this reason, the surface layer has low resistance to scratching and abrasion, and it is necessary to perform coating for modifying the surface for use as a cooking utensil. Further, the surface of the aggregate in contact with the resin layer is in the same state, and when the resin layer is peeled off, the surface of the aggregate is also destroyed, so that it is necessary to perform a treatment for improving the peel resistance at the same time.

このため本実施形態３では、煮物調理に耐えられる温度、具体的には１２０℃を上限とした耐熱性を備えた樹脂で、凝結体との接触部分を補強することを目的として剥離耐性を向上させる処理を行った。まず、凝結体表面にＰＥＳ（ポリエーテルサルフォン）微粉末と安定分散を確保する界面活性剤を含む分散液（液状樹脂）をスプレーで塗布し、１５０℃の温度で１０分間乾燥させる。そして、ＰＦＡ（テトラフルオロエチレン・パーフルオロアルキルビニエーテル共重合体、フッ素樹脂を含む）及びＰＥＳの微粉末を含んだ樹脂混合溶液をスプレーで複数回に分けて塗布し、１５０℃の温度で１０分間乾燥させる。   For this reason, in this Embodiment 3, it is resin with the heat resistance which set the temperature which can endure boiled cooking, specifically 120 degreeC as an upper limit, and improves peeling resistance for the purpose of reinforcing the contact part with a condensed body. The processing to be performed was performed. First, a dispersion (liquid resin) containing a fine PES (polyethersulfone) powder and a surfactant that ensures stable dispersion is applied to the surface of the aggregate by spraying, and dried at a temperature of 150 ° C. for 10 minutes. Then, a resin mixed solution containing fine powder of PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer and fluororesin) and PES is applied in a plurality of times by spraying, and is applied at a temperature of 150 ° C. Let dry for a minute.

スプレーによる分散液及び樹脂混合溶液の塗布は、凝結体表面から樹脂混合溶液が吸収されて凝結体の内部に気泡が発生することのないよう、十分な時間間隔をおいて行うのが望ましい。それから、凝結体表面に樹脂混合溶液が吸収されずに滞留した状態で塗布を完了し、樹脂混合溶液が乾燥しきる前にＰＦＡの粉末を塗布する。その後、凝結体を３４０〜４００℃に加熱することにより乾燥及び溶融を行って、凝結体の表面改質と塗装が完了する。これにより、凝結体の最外面に樹脂塗装面が形成される。   It is desirable to apply the dispersion liquid and the resin mixed solution by spraying at a sufficient time interval so that the resin mixed solution is not absorbed from the surface of the aggregate and bubbles are not generated inside the aggregate. Then, the application is completed in a state where the resin mixed solution stays on the aggregate surface without being absorbed, and the PFA powder is applied before the resin mixed solution is completely dried. Then, the aggregate is dried and melted by heating to 340 to 400 ° C. to complete the surface modification and coating of the aggregate. Thereby, the resin coating surface is formed on the outermost surface of the aggregate.

なお凝結体の加熱は、樹脂の塗装された面の反対面から行うことが望ましい。これは、ＰＦＡの粉末が凝縮体の下部から溶融して気泡が残留し、調理時等に膨れが発生するのを防止するためである。この加熱により、まず樹脂混合溶液中の水分が蒸発し、その後ＰＥＳが溶融して凝縮体表面に含浸し、凝結体と樹脂層の接触部を覆うようにして凝縮体表面を補強する。それから融点の高いＰＦＡが溶融するが、分散液中のＰＥＳと樹脂混合溶液中のＰＥＳ、及び樹脂混合溶液中のＰＦＡと最後に塗布したＰＦＡの粉末が融着して結合するため強固な樹脂塗装を行うことができる。   It is desirable to heat the aggregate from the surface opposite to the resin-coated surface. This is to prevent PFA powder from melting from the lower part of the condensate, leaving bubbles and causing blistering during cooking. By this heating, the water in the resin mixed solution is first evaporated, and then the PES is melted and impregnated on the surface of the condensate to reinforce the condensate surface so as to cover the contact portion between the aggregate and the resin layer. Then, PFA with a high melting point melts, but the PES in the dispersion, the PES in the resin mixed solution, and the PFA in the resin mixed solution and the last applied PFA powder are fused and bonded, so that the resin coating is strong. It can be performed.

上記の樹脂塗装の剥離耐性について、５ｍｍ間隔の升目状にこの塗装を施した試験片を用いて検査を行った。なおこの検査は、試験片に粘着テープを密着させて剥離したときの樹脂層の剥離状態を見るものである。その結果、樹脂混合溶液を塗布せずＰＦＡのみを塗布したものが６０〜８５％の保持率であったのに対して、本実施形態３に係る樹脂塗装を行ったものは全く剥離を生じることがなく、剥離耐性が大幅に改善されていることを確認した。また、鉄からなる繊維状物質と複合化した外面は硬度が大幅に向上しており、繊維状物質と複合化していないものよりも、摩耗や引っ掻きに対する耐性が向上していることも確認した。   The peeling resistance of the above-mentioned resin coating was inspected using a test piece having this coating applied in a grid shape with an interval of 5 mm. In this inspection, the peeled state of the resin layer is observed when the adhesive tape is brought into close contact with the test piece and peeled off. As a result, the retention rate of 60 to 85% was obtained by applying only PFA without applying the resin mixed solution, whereas the resin coating according to the third embodiment caused peeling at all. It was confirmed that the peel resistance was greatly improved. It was also confirmed that the outer surface combined with the fibrous material made of iron had a significantly improved hardness, and the resistance to abrasion and scratching was improved as compared with the one not combined with the fibrous material.

なお上記のように、繊維状物質として電磁誘導加熱の効率を低下させないステンレスやカーボンからなるマットを使用するようにしてもよい。また、磁性金属でないため電磁誘導加熱には寄与しないが強度や摩耗性を改善するために、ミクロフィブリル化セルロース等の結合材とシリカ（ＳｉＯ2）とを含む柔軟なアルミナペーパーを用いるようにしてもよい。このアルミナペーパーは、アルミナ繊維を不織布状に成型したものであり、これを用いることにより耐摩耗性等を向上させることができる。 As described above, a mat made of stainless steel or carbon that does not reduce the efficiency of electromagnetic induction heating may be used as the fibrous material. In addition, since it is not a magnetic metal, it does not contribute to electromagnetic induction heating, but in order to improve strength and wearability, a flexible alumina paper containing a binder such as microfibrillated cellulose and silica (SiO 2 ) should be used. Also good. This alumina paper is obtained by molding alumina fibers into a nonwoven fabric, and by using this, it is possible to improve wear resistance and the like.

本実施形態３では、成型用金型に磁性金属からなる繊維状物質を載置して、炭素を主成分とする混合物と複合化させるため、電磁誘導加熱の効率を下げることなく、電磁誘導加熱用調理器具の表面の摩耗や引っ掻きに耐性を向上させることができる。なお、その他の効果については実施形態１に係る電磁誘導加熱用調理器具の製造方法と同様である。   In Embodiment 3, since a fibrous material made of magnetic metal is placed on a molding die and combined with a mixture containing carbon as a main component, electromagnetic induction heating is performed without reducing the efficiency of electromagnetic induction heating. Resistance to wear and scratching of the surface of the cooking utensils can be improved. In addition, about another effect, it is the same as that of the manufacturing method of the cooking utensil for electromagnetic induction heating which concerns on Embodiment 1. FIG.

なお実施形態１から実施形態３の製造方法で製造された電磁誘導加熱用調理器具は、電磁誘導加熱を利用した炊飯器やコンロ等の電磁誘導加熱調理器に使用される釜や鍋、フライパンなどの電磁誘導加熱用調理器具として用いることができる。   In addition, the electromagnetic induction heating cooking utensil manufactured by the manufacturing method of Embodiments 1 to 3 is a pot, a pan, a frying pan, or the like used in an electromagnetic induction heating cooking apparatus such as a rice cooker or a stove using electromagnetic induction heating. It can be used as a cooking utensil for electromagnetic induction heating.

本発明に係る電磁誘導加熱用調理器具及びその製造方法並びに電磁誘導加熱調理器は、上記の実施形態に限定されるものでなく、本発明の思想の範囲内において変更することができる。例えば、成型用金型の形状や成型品を凝結する際の加熱温度、混練する繊維や繊維状物質の材質は、状況に応じて適宜変更することができる。   The electromagnetic induction heating cooking utensil, the manufacturing method thereof, and the electromagnetic induction heating cooker according to the present invention are not limited to the above embodiment, and can be changed within the scope of the idea of the present invention. For example, the shape of the molding die, the heating temperature at the time of condensing the molded product, and the material of the fiber or fibrous material to be kneaded can be appropriately changed according to the situation.

実施形態１に係る成型用金型を示した縦断面図。1 is a longitudinal sectional view showing a molding die according to Embodiment 1. FIG. 実施形態３に係る成型用金型を示した縦断面図。FIG. 5 is a longitudinal sectional view showing a molding die according to a third embodiment.

符号の説明Explanation of symbols

１ 注入口、２ 鍔部、３ 下金型、４ 上金型、５ シリンダー、６ 抜き穴、取出口。
1 Inlet, 2 collars, 3 Lower mold, 4 Upper mold, 5 Cylinder, 6 Punching hole, Outlet.

Claims (6)

電磁誘導加熱用調理器具の製造方法であって、
前記電磁誘導加熱用調理器具の形状を成型する成型用金型の、下金型と上金型との間を、最終的に成形を行う状態よりも開いた状態に維持する工程と、
前記成型用金型内に繊維状物質を載置する工程と、
炭素を含有する粉粒と、炭素を含有する液状の結合材との混合物を前記成型用金型に注入する工程と、
前記成型用金型の下金型及び上金型の何れか一方を、最終的に成型を行う状態に移動させて前記混合物を加圧し、成型品を製造する工程と、
該成型品を無酸素条件下で加熱して凝結させることにより凝結体を製造する工程と
を有することを特徴とする電磁誘導加熱用調理器具の製造方法。 A method of manufacturing a cooking utensil for electromagnetic induction heating,
Maintaining the state between the lower mold and the upper mold of the mold for molding the shape of the electromagnetic induction heating cooking utensil in an open state rather than the final molding state;
Placing a fibrous material in the mold, and
Injecting a mixture of powder containing carbon and a liquid binder containing carbon into the molding die;
Either one of the lower mold and the upper mold of the molding mold is moved to a state where the molding is finally performed, and the mixture is pressurized to produce a molded product;
And a step of producing a coagulated product by heating and coagulating the molded product under oxygen-free conditions. 前記繊維状物質は、磁性金属からなることを特徴とする請求項１記載の電磁誘導加熱用調理器具の製造方法。 The fibrous material, manufacturing method of claim 1 electromagnetic induction heating cooking appliance wherein a made of a magnetic metal. 前記凝結体を製造する工程の後に、該凝結体の表面に樹脂塗装を施す工程を有することを特徴とする請求項１又は２記載の電磁誘導加熱用調理器具の製造方法。 The method for producing a cooking utensil for electromagnetic induction heating according to claim 1 or 2, further comprising a step of applying resin coating to a surface of the aggregate after the step of manufacturing the aggregate. 電磁誘導加熱用調理器具の形状を成型する成型用金型の、下金型と上金型との間を、最終的に成形を行う状態よりも開いた状態に維持し、
前記成型用金型内に繊維状物質を載置し、
炭素を含有する粉粒と、炭素を含有する液状の結合材との混合物を前記成型用金型に注入し、
前記成型用金型の下金型及び上金型の何れか一方を、最終的に成型を行う状態に移動させて前記混合物を加圧し、成型品を製造し、
該成型品を無酸素条件下で加熱して凝結させることにより製造された、炭素を含有する原料と磁性金属からなる繊維状物質が複合された凝結体からなることを特徴とする電磁誘導加熱用調理器具。 Maintaining the mold between the lower mold and the upper mold in a mold that molds the shape of the electromagnetic induction heating cooking utensil is more open than the final mold.
Place the fibrous material in the mold for molding,
Injecting a mixture of powder containing carbon and a liquid binder containing carbon into the molding die,
Either one of the lower mold and the upper mold of the molding mold is moved to a state where the molding is finally performed, the mixture is pressurized, and a molded product is manufactured.
For electromagnetic induction heating, characterized in that the molded product is produced by heating and condensing the molded product under oxygen-free conditions, and comprising an aggregate obtained by combining a carbon-containing raw material and a fibrous material composed of a magnetic metal. kitchenware. 前記凝結体の表面に樹脂塗装が施されていることを特徴とする請求項４記載の電磁誘導加熱用調理器具。 The electromagnetic induction heating cooking utensil according to claim 4, wherein a resin coating is applied to a surface of the aggregate. 請求項４又は５記載の電磁誘導加熱用調理器具を備えていることを特徴とする電磁誘導加熱調理器。 An electromagnetic induction heating cooker comprising the electromagnetic induction heating cooking utensil according to claim 4 or 5 .
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