JP2008278984A - Method of manufacturing electromagnetic induction heating cooker - Google Patents
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- JP2008278984A JP2008278984A JP2007124113A JP2007124113A JP2008278984A JP 2008278984 A JP2008278984 A JP 2008278984A JP 2007124113 A JP2007124113 A JP 2007124113A JP 2007124113 A JP2007124113 A JP 2007124113A JP 2008278984 A JP2008278984 A JP 2008278984A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 230000005674 electromagnetic induction Effects 0.000 title claims abstract description 25
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 41
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 36
- 239000002245 particle Substances 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 16
- 229920005992 thermoplastic resin Polymers 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 238000000465 moulding Methods 0.000 claims abstract description 8
- 239000011230 binding agent Substances 0.000 claims description 15
- 238000010411 cooking Methods 0.000 claims description 10
- 238000000354 decomposition reaction Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 7
- 239000012298 atmosphere Substances 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 5
- 238000005470 impregnation Methods 0.000 claims description 3
- 239000000155 melt Substances 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 239000004745 nonwoven fabric Substances 0.000 claims description 2
- 229920001187 thermosetting polymer Polymers 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims 2
- 229910052760 oxygen Inorganic materials 0.000 claims 2
- 239000001301 oxygen Substances 0.000 claims 2
- 239000011248 coating agent Substances 0.000 abstract description 9
- 238000000576 coating method Methods 0.000 abstract description 9
- 238000003825 pressing Methods 0.000 abstract description 2
- 239000005011 phenolic resin Substances 0.000 description 21
- 238000010304 firing Methods 0.000 description 13
- 229920000728 polyester Polymers 0.000 description 9
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- 238000010586 diagram Methods 0.000 description 5
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 4
- 239000003973 paint Substances 0.000 description 4
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- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000000748 compression moulding Methods 0.000 description 3
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- 241000209094 Oryza Species 0.000 description 2
- 235000007164 Oryza sativa Nutrition 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
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- 239000011737 fluorine Substances 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
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- 239000002253 acid Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
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- 239000004020 conductor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
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- 238000007731 hot pressing Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
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- 238000004898 kneading Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 229920003986 novolac Polymers 0.000 description 1
- 239000010680 novolac-type phenolic resin Substances 0.000 description 1
- 125000002524 organometallic group Chemical group 0.000 description 1
- 239000002006 petroleum coke Substances 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
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Abstract
Description
この発明は、電磁誘導加熱が可能な炊飯器釜などの電磁誘導加熱調理器の製造方法に関するもので、更に詳しくはカーボン粉粒を主体とする圧縮成型品を無酸素状態で焼成処理することによって塗装が容易な電磁誘導加熱調理器の製造方法に関する。 The present invention relates to a method for producing an electromagnetic induction heating cooker such as a rice cooker capable of electromagnetic induction heating, and more specifically, by subjecting a compression molded product mainly composed of carbon powder to a baking process in an oxygen-free state. The present invention relates to a method of manufacturing an electromagnetic induction heating cooker that is easy to paint.
電磁誘導加熱調理器であるコンロや炊飯器は、高周波磁場発生装置である誘導加熱コイルが発生する渦電流によって磁性体が発熱する電磁誘導加熱を利用するものである。電磁誘導加熱調理器は、調理器による食品の速やかで均一な加熱を向上するために、アルミニウムや銅などを積層したクラッド材を釜状に成形した成型品を調理器として用いていた。しかし、クラッド材は鍋や釜などに絞り加工することが困難である。さらに、内外面に施した食材の剥離性や使用時の耐摩耗性を良好とするための耐熱樹脂塗装との各積層界面が剥離するなどの不具合もあった。 A stove or rice cooker that is an electromagnetic induction heating cooker uses electromagnetic induction heating in which a magnetic material generates heat due to an eddy current generated by an induction heating coil that is a high-frequency magnetic field generator. In order to improve the quick and uniform heating of food by the cooker, the electromagnetic induction heating cooker has used a molded product obtained by molding a clad material laminated with aluminum, copper or the like into a pot shape. However, it is difficult to draw the clad material into a pan or a pot. Furthermore, there were also problems such as peeling of each laminated interface with the heat-resistant resin coating for improving the peelability of the food applied to the inner and outer surfaces and the wear resistance during use.
このため、クラッド材と比較して電磁誘導加熱調理器に適度な導電性と誘電性と優れた熱伝導度とを有しているコークスなどの高炭素含有物粉粒を、無酸素状態で1000〜3000℃の加熱によって凝結させたカーボンの焼結体のブロック状成型物を切削して鍋や釜などの成型品を得た後、調理面である内面にフッ素樹脂が下塗り塗料を介して塗装されて成る誘導加熱調理器が提案されている(例えば、特許文献1参照)。 For this reason, high carbon content powder particles such as coke having moderate conductivity, dielectric property, and excellent thermal conductivity in an electromagnetic induction heating cooker as compared with the clad material are 1000 in an oxygen-free state. After cutting a block-shaped molded product of sintered carbon that has been condensed by heating at ~ 3000 ° C to obtain a molded product such as a pot or pot, a fluororesin is applied to the inner surface, which is the cooking surface, via an undercoat There has been proposed an induction heating cooker (see, for example, Patent Document 1).
また、250℃で加圧して棒柱状に成形した炭素圧縮体を切削加工した加工物にフッ素樹脂コートを施す手段が紹介されており、高温での調理器具として有効であることが述べられている(例えば、特許文献2参照)。 In addition, a means for applying a fluororesin coat to a workpiece obtained by cutting a carbon compact formed by pressing at 250 ° C. into a columnar shape has been introduced, and is described as being effective as a cooking utensil at high temperature. (For example, refer to Patent Document 2).
しかし、これら成型品への塗装は、カーボンの凝結体が備える気孔に塗料を含浸させて発現するアンカー効果によって密着するものである。そのため使用するカーボン粒子が微細で結合材量が多い圧縮成型や射出成型の原料系の場合には、得られた成型品の焼成物の気孔が小さいために塗料が充分に含浸しないので、塗料の密着性が不十分なものとなる。 However, the coating on these molded products is in close contact by the anchor effect that is expressed by impregnating the pores of the carbon aggregates with the paint. Therefore, in the case of a raw material system of compression molding or injection molding in which the carbon particles used are fine and the amount of the binder is large, the pores of the fired product of the obtained molded product are small and the paint is not sufficiently impregnated. Adhesion is insufficient.
この課題の解決手段として、例えば、披着物表面の溶融状態下で原料供給して接合する手段が提案されている(例えば、特許文献3参照)。 As means for solving this problem, for example, a means for supplying and joining raw materials under the molten state of the surface of an article is proposed (for example, see Patent Document 3).
また、有機金属カップリング剤を用いて基材との接着性を改善する手段が提案されている(例えば、特許文献4参照)。 In addition, means for improving the adhesion with a substrate using an organometallic coupling agent has been proposed (see, for example, Patent Document 4).
しかしながら、これら手段の適用には、誘電加熱を可能とする高温焼成して得たカーボン成形体を成す凝結体の表面に他の物質との接着性を促す官能基が一切存在しないため、充分な接着力を確保することが出来ない。 However, the application of these means is sufficient because there is no functional group that promotes adhesion to other substances on the surface of the aggregate formed of the carbon molded body obtained by high-temperature firing that enables dielectric heating. Adhesive strength cannot be secured.
また、α−セルロースを主成分とする繊維を抄造してシート状にした後、これに高炭素含有樹脂を含浸したプリプレグを積層して熱圧プレスで得た成形体を800℃以上の無酸素状態下で焼成処理を行うことによって、高い気孔率を備えた焼成加工体を得る手段が開示されている(例えば、特許文献5参照)。
しかしながら、これら手段の適用には、過度な気孔の存在によって強度の低下を来しやすく、調理器具としての耐衝撃性や摩耗性を保持することが出来ないという課題があった。 However, the application of these means has a problem in that the strength tends to decrease due to the presence of excessive pores, and the impact resistance and wear resistance as a cooking utensil cannot be maintained.
この発明は、上記のような課題を解決するためになされたもので、塗料の密着性に優れた電磁誘導加熱調理器の製造方法を提供することを目的とする。 The present invention has been made to solve the above-described problems, and an object thereof is to provide a method for manufacturing an electromagnetic induction heating cooker having excellent paint adhesion.
この発明に係る電磁誘導加熱調理器の製造方法は、カーボン粉粒と高炭素含有物からなる結合材とを含む混合物を炭素含有率の低い熱可塑性樹脂のシートを載置した金型内に投入し、その後、金型を加温して熱可塑性樹脂が溶融した状態で加圧保持して結合材を固化して賦型し、得られた成形品を高温の無酸素条件下で炭化させる焼成処理を行うことを特徴とする。 The method of manufacturing an electromagnetic induction heating cooker according to the present invention is to put a mixture containing carbon particles and a binder composed of a high carbon content into a mold on which a low carbon content thermoplastic resin sheet is placed. After that, the mold is heated to hold the pressure in a molten state of the thermoplastic resin to solidify the binder and mold, and the resulting molded product is carbonized under high temperature oxygen-free conditions It is characterized by performing processing.
成形体に含浸された溶融した熱可塑性樹脂である液状物質は、含浸して占有した容積部分が高温焼成時に分解または気散して消失するので、気孔が形成される。当該気孔が成形体に含浸して粒子間に滞留した液状物質が存在していた部分であることから、塗料は複雑で非直線状の気孔形状に容易に侵入するので、密着性に優れる塗膜が得易い。 Since the liquid material which is the molten thermoplastic resin impregnated in the molded body is decomposed or diffused during high temperature firing, the impregnated and occupied volume portion disappears, and pores are formed. Since the pores are the part where the liquid material staying between the particles was impregnated in the molded body, the coating easily penetrates into the complicated and non-linear pore shape, so the coating film has excellent adhesion Is easy to obtain.
実施の形態1.
図1は実施の形態1を示す図で、釜の製造方法を示す製造工程図である。
圧縮成形によって釜状の成型品を得る手段に関し、原料であるカーボン粉粒とノボラック型フェノール樹脂を結合材とした混合物を金型に充填して得られる電磁誘導加熱調理器(例えば、釜)の製造方法について、図1を用いて、以下に詳述する。
Embodiment 1 FIG.
FIG. 1 is a diagram showing the first embodiment and is a production process diagram showing a method for producing a hook.
Regarding means for obtaining a pot-shaped molded product by compression molding, an electromagnetic induction heating cooker (for example, a pot) obtained by filling a mold with a mixture of raw carbon particles and a novolac-type phenol resin as a binder. The manufacturing method will be described in detail below with reference to FIG.
先ず、石油コークスを3000℃の無酸素状態で焼成してグラファイト化した後、これを0.3mm以下に粉砕したカーボン粉粒とする。このカーボン粉粒と、常温で固体の熱硬化性の高炭素含有物であるフェノール樹脂をほぼ均一に分散させる。その後、これを押出機で混練して得た混合物を、更に1mm以下に粉砕して原料の混練物を作製する(S10)。 First, petroleum coke is fired in an oxygen-free state at 3000 ° C. to be graphitized, and then this is made into carbon particles pulverized to 0.3 mm or less. The carbon powder particles and a phenol resin, which is a solid thermosetting high carbon content at normal temperature, are dispersed almost uniformly. Thereafter, the mixture obtained by kneading with an extruder is further pulverized to 1 mm or less to prepare a kneaded material (S10).
次に、カーボン粉粒と未硬化の粉末状のフェノール樹脂との混練物を、金型に投入して圧縮成形する。 Next, a kneaded product of carbon particles and uncured powdery phenol resin is put into a mold and compression molded.
このとき、金型を約90℃に調整しておき、低分子量ポリエステル(炭素含有率の低い熱可塑性樹脂の一例)で厚さが300〜500μmのシートを金型に載置して密着させる(S11)。 At this time, the mold is adjusted to about 90 ° C., and a sheet having a thickness of 300 to 500 μm made of low molecular weight polyester (an example of a thermoplastic resin having a low carbon content) is placed on and closely adhered to the mold ( S11).
シートの上に混練物の厚さを整えて散布し、僅かな圧力を付与して金型を閉塞する(S12)。 The thickness of the kneaded material is adjusted and sprayed on the sheet, and a slight pressure is applied to close the mold (S12).
ここで用いる低分子量ポリエステルのシート材は、ポリヒドロキシブタン酸をメチルエステル化して分子量を10000以下としたものである。これは分解しやすく、残留物が少ないのが特徴である。 The low-molecular-weight polyester sheet material used here is a polyhydroxybutanoic acid methyl esterified to have a molecular weight of 10,000 or less. This is easy to decompose and is characterized by little residue.
次に金型温度を、低分子量ポリエステルの融点を超えて、フェノール樹脂の成型温度以下の約140℃に昇温する(S13)。この温度ではフェノール樹脂が溶融しておらず、混練物が受ける僅かな加圧によってポリエステル溶融物が、比較的、疎な空隙内に侵入する状態を有する。 Next, the mold temperature is raised to about 140 ° C. below the molding temperature of the phenol resin, exceeding the melting point of the low molecular weight polyester (S13). At this temperature, the phenolic resin is not melted, and the polyester melt is in a relatively sparse space due to slight pressure applied to the kneaded product.
次に、約140℃の温度で数分間の維持後、金型に圧力を付与して加圧すると同時に、金型温度をフェノール樹脂の成型温度である約200℃まで上昇させ、硬化させて賦型し成型品を得る(S14)。 Next, after maintaining at a temperature of about 140 ° C. for several minutes, pressure is applied to the mold, and at the same time, the mold temperature is raised to about 200 ° C., which is the molding temperature of the phenol resin, and is cured and applied. A molded product is obtained by molding (S14).
昇温過程で混練物を加圧することによってカーボン粉粒間の空隙は緻密化して、金型面近傍に含浸した低分子量ポリエステル溶融物が含浸の深さを増すことになる。型温の上昇に伴って、カーボン粉粒の表面にあるフェノール樹脂が粘度を低下して残りの空隙を埋めるように移動して硬化した状態で成型品を取り出す。 By pressurizing the kneaded product during the temperature rising process, the gaps between the carbon particles become dense, and the low molecular weight polyester melt impregnated near the mold surface increases the depth of impregnation. As the mold temperature rises, the phenolic resin on the surface of the carbon powder particles decreases in viscosity and moves to fill the remaining voids, and the molded product is taken out in a cured state.
絶縁物であるフェノール樹脂は、カーボン粉粒の間隙にあるので、これを炭化して導電体とする必要がある。得られた成型品は、焼成温度がフェノールの分解を来すことなしに低分子量ポリエステルを分解するために、約350℃の空気雰囲気中で低温焼成を施した後、成型品をコークスで覆った状態で耐火煉瓦などからなる高温炉内に埋没させて、無酸素状態の1000〜1200℃で高温焼成をして焼成体を得る(S15)。 Since the phenol resin which is an insulator is in the gaps between the carbon particles, it is necessary to carbonize this to make a conductor. The obtained molded product was subjected to low-temperature firing in an air atmosphere of about 350 ° C. in order to decompose the low molecular weight polyester without causing the decomposition of phenol at the firing temperature, and then the molded product was covered with coke. It is buried in a high-temperature furnace made of refractory bricks in a state and fired at a high temperature at 1000 to 1200 ° C. in an oxygen-free state to obtain a fired body (S15).
無酸素状態の高温焼成では樹脂成分の分解が進行し、カーボン粉粒の間隙にある絶縁物のフェノール樹脂が、分解によって生じた残留物の殆どが黒鉛となり、電気伝導性を醸し出すことになる。一方、混練物の間隙にあった低分子量ポリエステルは先の低温焼成で酸化分解が進行して殆どが消失し、高温焼成で一層の分解が進んで、その殆どが飛散して消滅する。 In the oxygen-free high-temperature firing, the decomposition of the resin component proceeds, and the insulating phenol resin in the gaps between the carbon particles makes most of the residue generated by the decomposition into graphite, which brings about electrical conductivity. On the other hand, the low molecular weight polyester present in the gaps of the kneaded product is mostly decomposed by the low-temperature firing and disappears most, and further decomposed by the high-temperature firing, most of which is scattered and disappears.
以上の工程を経て得られた焼成体には、調理の際の具材のこびりつきや他の調理具との摩擦や摩耗による損傷を軽減することを狙いとした塗装を行う。主には、内面にフッ素樹脂、外面にシリコン樹脂の希薄液を複数回に分けてスプレーを用いて塗布する。塗布した樹脂液は低分子量ポリエステルが飛散して消滅したことにより生成した気孔に含浸し、その後の乾燥および硬化によって、強固に密着した塗膜を形成した電磁誘導加熱調理器を得ることができる。 The fired body obtained through the above steps is coated with the aim of reducing the sticking of ingredients during cooking and the damage caused by friction and wear with other cooking utensils. Mainly, a fluorine resin is applied to the inner surface, and a dilute liquid of silicon resin is applied to the outer surface in a plurality of times using a spray. The applied resin liquid impregnates the pores generated by the low molecular weight polyester scattering and disappearing, and then, by drying and curing, it is possible to obtain an electromagnetic induction heating cooker in which a firmly adhered coating film is formed.
上記塗膜は、その密着性評価としてJIS K 5400に準拠した碁盤目テープ剥離試験を行い、全く剥離しない結果から、優れた密着性の確保を確認した。 The coating film was subjected to a cross-cut tape peeling test based on JIS K 5400 as an adhesion evaluation, and from the results of not peeling at all, it was confirmed that excellent adhesion was ensured.
なお、本実施の形態では、結合材として粉体状のノボラック型フェノール樹脂を用いたが、これに替えてレゾール型フェノール樹脂やタール、ピッチなどの炭素含有率の高い物質であれば、代替が可能である。これらは、高温での焼成時における分解生成物を飛散した後の炭素が十分に残存して、収縮や結合力の不足が生じる恐れが少ない。 In this embodiment, a powdered novolac type phenol resin is used as the binder, but instead of this, a substance having a high carbon content such as a resol type phenol resin, tar, or pitch can be replaced. Is possible. These are less likely to cause sufficient shrinkage of carbon after scattering of decomposition products during firing at high temperatures, resulting in insufficient shrinkage and bonding strength.
実施の形態2.
図2は実施の形態2を示す図で、釜の製造方法を示す製造工程図である。
Embodiment 2. FIG.
FIG. 2 is a diagram showing the second embodiment, and is a production process diagram showing a method for producing a hook.
電磁誘導加熱調理器(例えば、釜)を製造する別の製造方法について、図2を用いて詳述する。グラファイト化したカーボン粉粒と結合材であるノボラック型フェノール樹脂の混合物を金型に充填して圧縮成形を行うことによっての釜状成型品を得たのち、この成型品を無酸素の1000〜1200℃の雰囲気で焼成処理をして、焼成体を得た。 Another manufacturing method for manufacturing an electromagnetic induction heating cooker (for example, a kettle) will be described in detail with reference to FIG. After obtaining a kettle-shaped molded product by filling a mold with a mixture of graphitized carbon particles and a novolac-type phenolic resin as a binder and performing compression molding, the molded product is made oxygen-free 1000-1200. A fired body was obtained by firing treatment in an atmosphere of ° C.
カーボン粉粒は、0.3mm以下に粉砕後、フェノール樹脂と押出機で混練して混合物とし、更に1mm以下に粉砕して原料の混練物を作製する(S20)。 The carbon powder is pulverized to 0.3 mm or less, kneaded with a phenol resin with an extruder to obtain a mixture, and further pulverized to 1 mm or less to produce a kneaded material (S20).
次に、カーボン粉粒と未硬化のフェノール樹脂との混練物を、金型に投入して圧縮成形する。このとき、金型は約70℃に調整しておき、分子量が1000以下のポリビニルアルコールの約30%水溶液を予め不織布(紙等)に塗布して200μm程度の厚さの膜を形成する(S21)。分解または飛散が容易な液体の一例が、分子量が1000以下のポリビニルアルコールの約30%水溶液である。 Next, a kneaded product of carbon powder particles and uncured phenol resin is put into a mold and compression molded. At this time, the mold is adjusted to about 70 ° C., and an about 30% aqueous solution of polyvinyl alcohol having a molecular weight of 1000 or less is previously applied to a nonwoven fabric (paper or the like) to form a film having a thickness of about 200 μm (S21). ). An example of a liquid that can be easily decomposed or scattered is an approximately 30% aqueous solution of polyvinyl alcohol having a molecular weight of 1000 or less.
その膜の上に混練物を均一厚さになるよう整えて散布し、金型を僅かな圧力を付与して閉塞する(S22)。 The kneaded material is arranged and spread on the film so as to have a uniform thickness, and the mold is closed by applying a slight pressure (S22).
ここで用いたポリビニルアルコールの約30%水溶液は分解しやすく、適度な粘度を備えているので、混練物の粒子間に適度な空隙を形成して保持される。 The about 30% aqueous solution of polyvinyl alcohol used here is easily decomposed and has an appropriate viscosity, so that an appropriate space is formed between the particles of the kneaded product and retained.
次に金型を、フェノール樹脂の成型温度である200℃に昇温するが、加圧初期にはフェノール樹脂が溶融しておらず、疎な空隙内に侵入したポリビニルアルコール水溶液が空隙を形成して金型と接する部分で保持された状態を備える。 Next, the mold is heated to 200 ° C., which is the molding temperature of the phenol resin, but the phenol resin is not melted at the initial stage of pressurization, and the polyvinyl alcohol aqueous solution that has entered the sparse voids forms voids. And is held in a portion in contact with the mold.
その後、金型温度の上昇につれてフェノール樹脂が溶融する140℃近傍で、所定の高い圧力を付与する(S23)。 Thereafter, a predetermined high pressure is applied in the vicinity of 140 ° C. where the phenol resin melts as the mold temperature rises (S23).
その後、成型温度を更に約200℃まで上昇させ、硬化させて賦型し成型品を得る(S24)。 Thereafter, the molding temperature is further raised to about 200 ° C., cured and shaped to obtain a molded product (S24).
昇温過程での混練物の加圧は、カーボン粉粒間の空隙を緻密化して、金型面近傍からフェノール樹脂の溶融物空隙を閉塞しながら硬化する。従って、金型面に塗布したポリビニルアルコール水溶液が含浸の深さを増すと共に、空隙を確保して内部に残留した状態で固化した成型品を得ることが出来る。 Pressurization of the kneaded material in the temperature raising process densifies the gaps between the carbon particles and cures while closing the melt gaps of the phenolic resin from the vicinity of the mold surface. Therefore, it is possible to obtain a molded product that is solidified in a state where the polyvinyl alcohol aqueous solution applied to the mold surface increases the depth of impregnation and the voids are secured and remain inside.
次に、得られた成型品には、絶縁物であるフェノール樹脂がカーボン粉粒の間隙にあるので、これを炭化する必要がある。得られた成型品は、焼成温度がフェノール樹脂の分解に至らずに、ポリビニルアルコールの分解が開始する約350℃の空気雰囲気中で低温焼成を施した後、成型品をコークスで覆った状態で耐火煉瓦などからなる高温炉内に埋没させて、無酸素状態の1000〜1200℃で高温焼成をすることによって焼成体を得る(S25)。 Next, since the phenol resin which is an insulator exists in the space | interval of a carbon particle in the obtained molded article, this needs to be carbonized. The obtained molded product was subjected to low-temperature firing in an air atmosphere of about 350 ° C. where the decomposition temperature of the polyvinyl alcohol starts without causing the decomposition of the phenol resin, and then the molded product was covered with coke. A fired body is obtained by being buried in a high-temperature furnace made of refractory bricks and the like and fired at a high temperature at 1000 to 1200 ° C. in an oxygen-free state (S25).
無酸素状態での高温焼成では樹脂成分が分解し、カーボン粉粒の間隙にあって絶縁物のフェノール樹脂が分解によって生じた残留物の殆どが黒鉛となって、電気伝導性を醸し出すことになる。一方、混練物の間隙にあったポリビニルアルコールは先の低温焼成で酸化分解が進行しており、高温焼成で一層の分解が進んで、その殆どが飛散して消滅することになる。 High-temperature firing in an oxygen-free state decomposes the resin component, and most of the residue generated by the decomposition of the insulating phenolic resin in the gaps between the carbon particles becomes graphite, which leads to electrical conductivity. . On the other hand, the polyvinyl alcohol existing in the gap between the kneaded materials has been oxidatively decomposed by the previous low-temperature baking, and further decomposed by the high-temperature baking, most of which is scattered and disappears.
以上の工程を経て得られた電磁誘導加熱調理器には、調理の際の具材のこびりつきや他の調理具との摩擦や摩耗による損傷軽減を狙いとした塗装を行う。主には、内面にフッ素樹脂、外面にシリコン樹脂の希薄液を複数回に分けてスプレーを用いて塗布する(S26)。塗布した樹脂液は、低分子量ポリエステルが飛散して消滅したことにより生成した気孔に含浸し、その後の乾燥および硬化によって、強固に密着した塗膜を形成することになる。 The electromagnetic induction heating cooker obtained through the above steps is coated for the purpose of reducing damage caused by sticking of ingredients during cooking and friction and wear with other cooking utensils. Mainly, a fluorine resin is applied to the inner surface, and a dilute liquid of silicon resin is applied to the outer surface in a plurality of times using a spray (S26). The applied resin liquid impregnates pores generated by the low molecular weight polyester scattering and disappearing, and forms a tightly adhered coating film by subsequent drying and curing.
上記塗膜は、その密着性評価としてJIS K 5400に準拠した碁盤目テープ剥離試験を行い、全く、剥離しないことを結果から、優れた密着性の確保を確認した。 The coating film was subjected to a cross-cut tape peeling test in accordance with JIS K 5400 as its adhesion evaluation, and from the results, it was confirmed that excellent adhesion was ensured.
なお、本実施の形態では、結合材としてフェノール樹脂を用いたが、これに替えてタールピッチなどの炭素含有率の高い物質であれば、代替が可能である。これらは、高温での焼成時における分解生成物を飛散した後の炭素が十分に残存して、収縮や結合力の不足が生じる恐れが少ない。 In this embodiment, a phenol resin is used as the binder, but instead, a material having a high carbon content such as tar pitch can be substituted. These are less likely to cause sufficient shrinkage of carbon after scattering of decomposition products during firing at high temperatures, resulting in insufficient shrinkage and bonding strength.
Claims (9)
その後、前記金型を加温して前記熱可塑性樹脂が溶融した状態で加圧保持して結合材を固化して賦型し、
得られた成形品を高温の無酸素条件下で炭化させる焼成処理を行うことを特徴とする電磁誘導加熱調理器の製造方法。 A mixture containing carbon particles and a binder composed of a high carbon content is put into a mold on which a low carbon content thermoplastic resin sheet is placed,
After that, the mold is heated and the thermoplastic resin is melted and held under pressure to solidify the binder and mold,
The manufacturing method of the electromagnetic induction heating cooking appliance characterized by performing the baking process which carbonizes the obtained molded article on high temperature oxygen-free conditions.
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