JP2002019016A - Thermoplastic resin-coated metal plate excellent in recycling property, metal plate-joined object with the metal plate fusion-bonded, and method for separating the object - Google Patents
Thermoplastic resin-coated metal plate excellent in recycling property, metal plate-joined object with the metal plate fusion-bonded, and method for separating the objectInfo
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- JP2002019016A JP2002019016A JP2000203330A JP2000203330A JP2002019016A JP 2002019016 A JP2002019016 A JP 2002019016A JP 2000203330 A JP2000203330 A JP 2000203330A JP 2000203330 A JP2000203330 A JP 2000203330A JP 2002019016 A JP2002019016 A JP 2002019016A
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- Prior art keywords
- metal plate
- thermoplastic resin
- coating film
- coated
- resin
- Prior art date
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、リサイクルが容易
な熱可塑性樹脂被覆金属板、それを熱融着した金属板接
合物及び金属板接合物の分離方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermoplastic resin-coated metal plate which is easy to recycle, a metal plate joined product obtained by heat-sealing the same, and a method of separating the metal plate joined product.
【０００２】[0002]
【従来の技術】最近の家電製品などの塗覆装金属板を用
いた製品は、プレコート化が進み塗覆装金属板を加工
し、接合して製造されている。従来、塗覆装金属板を接
合する場合、かしめ等による方法、リベット、ネジ止め
等による方法、溶接による方法が一般的である。これら
は次のような問題がある。かしめ等による接合は、強度
が弱く製品に凹凸が生じる。リベット、ネジ止めによる
接合は、製品に凹凸が生じるだけでなく他の材料（リベ
ット材、ネジ材）を必要とする。溶接による接合は、塗
装金属板は表・裏面ともに電気絶縁性塗膜が被覆されて
いるので溶接が困難であり製品に歪みを生じ作業も煩雑
である。接着剤による接合もあるが、固着まで時間がか
かり確実ではない。2. Description of the Related Art Products using a coated metal plate, such as recent home electric appliances, have been manufactured by prepainting, processing and joining the coated metal plate. Conventionally, when joining a coated metal plate, a method using caulking, a method using rivets, screws or the like, and a method using welding are generally used. These have the following problems. Bonding by caulking or the like has low strength and causes irregularities in the product. Joining by rivets and screws requires not only irregularities in the product but also other materials (rivet materials, screw materials). Joining by welding is difficult because the coated metal plate is covered with an electrically insulating coating film on both the front and back surfaces, resulting in distortion of the product and complicated operations. Although there is bonding with an adhesive, it takes a long time to fix and is not reliable.
【０００３】近年、リサイクル法により製造メーカーに
リサイクルを義務付けされるようになってきた。これま
で、破砕処理等により原材料や燃料として再利用するこ
とが一般的であったが、今後は部品の再利用を考えなけ
ればならない。ところで、かしめ、リベット、ネジ、溶
接、接着剤による接合法では、分離・解体が困難であ
り、部品を再利用するには手作業で分解する必要があり
非常に煩雑かつ莫大な費用を要する。In recent years, manufacturers have become obliged to recycle by the Recycling Law. Until now, it has been common practice to reuse raw materials and fuel by crushing, etc., but it is necessary to consider reusing parts in the future. By the way, in the joining method using caulking, rivets, screws, welding, and adhesives, separation and disassembly are difficult, and parts need to be manually disassembled to be reused, which is very complicated and requires enormous cost.
【０００４】[0004]
【発明が解決しようとする課題】本発明の課題は、リベ
ット、ネジ、接着剤等の他材料を使用することなく、製
品に歪み等を生じず、容易に迅速かつ確実に接合するこ
とができる塗装金属板を得ることであり、かつ容易に分
離・解体することができ、リサイクルを容易にすること
にある。SUMMARY OF THE INVENTION It is an object of the present invention to easily and quickly and surely join products without using other materials such as rivets, screws, adhesives and the like, without causing distortion or the like in products. An object of the present invention is to provide a coated metal plate, which can be easily separated and dismantled, and facilitates recycling.
【０００５】[0005]
【課題を解決するための手段】発明者等は、金属板の接
合及び分離方法について鋭意検討した結果、少なくとも
片面に熱可塑性樹脂を含む塗膜を被覆した金属板を加熱
・圧着することにより、迅速かつ確実に接合することが
でき、逆に分離・解体するにも熱可塑性樹脂の融点以上
に加熱すれば容易であることを見出した。しかも接合は
塗装直後の溶融状態の熱可塑性樹脂に接着するのでな
く、通常の塗装金属板として塗膜が形成された後、加工
の際に加熱・圧着することにより行われる。したがっ
て、本発明の塗装金属板は加熱・圧着しなければ一般的
な塗装金属板として使用できることも特長の一つであ
る。使用形態の一例を挙げると、本発明に従ったプレコ
ート金属板をコイルや切板として製品化し、家電製品等
に加工されるとき、加熱・圧着することで容易に接合で
きる。Means for Solving the Problems As a result of intensive studies on the joining and separating methods of metal plates, the inventors have found that a metal plate coated with a coating containing a thermoplastic resin on at least one side is heated and crimped. It has been found that bonding can be performed quickly and reliably, and conversely, separation and disassembly can be easily achieved by heating to a temperature higher than the melting point of the thermoplastic resin. Moreover, the bonding is performed not by bonding to the thermoplastic resin in a molten state immediately after coating, but by forming a coating film as an ordinary coated metal plate and then heating and pressing it during processing. Therefore, one of the features is that the coated metal plate of the present invention can be used as a general coated metal plate unless it is heated and pressed. To give an example of the form of use, when the precoated metal sheet according to the present invention is commercialized as a coil or a cut plate and processed into home electric appliances or the like, it can be easily joined by heating and pressing.
【０００６】すなわち本発明は、金属板の少なくとも片
面に熱可塑性樹脂を含む塗膜を形成し、塗膜同士もしく
は該塗膜と異材との接合及び分離が容易なリサイクル性
に優れた熱可塑性樹脂被覆金属板であり、熱可塑性樹脂
被覆金属板の塗膜同士もしくは該塗膜と異材を重ね合わ
せて熱融着して接合する。また、前記金属板接合物を熱
可塑性樹脂の融点以上の温度で加熱することにより容易
に分離できるものである。That is, the present invention provides a thermoplastic resin having excellent recyclability, in which a coating film containing a thermoplastic resin is formed on at least one surface of a metal plate, and the coating films are easily bonded and separated from each other or between different coating materials. It is a coated metal plate, and the coatings of the thermoplastic resin-coated metal plates or the coating and the dissimilar material are overlapped and bonded by heat fusion. Further, the metal plate joint can be easily separated by heating at a temperature higher than the melting point of the thermoplastic resin.
【０００７】[0007]
【発明の実施の形態】以下、本発明の実施の形態を説明
する。金属板に被覆する熱可塑性樹脂としては、ポリビ
ニルアルコール、ポリビニルブチラール、ポリビニルア
セタール、ポリ酢酸ビニル、ポリ塩化ビニル、ポリビニ
ルピロリドン、ポリスチレン等のビニル系樹脂、ポリメ
チル（メタ）アクリレート、ポリブチル（メタ）アクリ
レート、ポリアクリルアミド、ポリアクリロニトリル等
のアクリレート系樹脂、ポリプロピレン、ポリエチレン
等のポリオレフィン系樹脂、ポリエステル樹脂、ポリカ
ーボネート樹脂、ポリウレタン樹脂、ポリアミド樹脂、
尿素樹脂、ポリカプロラクトン樹脂、ポリアリレート樹
脂、ポリスルホン樹脂、シリコーンポリエステル樹脂、
エポキシ樹脂等や、これらの共重合体又は混合物による
塗料が使用できる。また、ポリオレフィン樹脂を無水マ
レイン酸等で変性し、接着性を向上させた変性ポリオレ
フィン樹脂、アクリルモノマーに重合触媒や反応促進剤
を加え、重合と接着を同時に行うモノマーセメント、耐
水性や耐熱性を向上させるため、硫酸チタニル、硝酸ク
ロム等の金属塩を添加したものを使用することができ
る。Embodiments of the present invention will be described below. Examples of the thermoplastic resin to be coated on the metal plate include polyvinyl alcohol, polyvinyl butyral, polyvinyl acetal, polyvinyl acetate, polyvinyl chloride, polyvinyl pyrrolidone, vinyl resins such as polystyrene, polymethyl (meth) acrylate, polybutyl (meth) acrylate, Acrylic resins such as polyacrylamide and polyacrylonitrile, polyolefin resins such as polypropylene and polyethylene, polyester resins, polycarbonate resins, polyurethane resins, polyamide resins,
Urea resin, polycaprolactone resin, polyarylate resin, polysulfone resin, silicone polyester resin,
An epoxy resin or the like, or a paint made of a copolymer or a mixture thereof can be used. In addition, a polyolefin resin is modified with maleic anhydride or the like, and a modified polyolefin resin with improved adhesiveness, a polymerization catalyst or a reaction accelerator is added to an acrylic monomer, a monomer cement that simultaneously performs polymerization and adhesion, and water resistance and heat resistance are improved. In order to improve the properties, those to which metal salts such as titanyl sulfate and chromium nitrate are added can be used.
【０００８】これらの熱可塑性樹脂の中でも、接合を迅
速に行うためには、熱軟化挙動がシャープであり、融点
を境に急激に軟化・溶融する樹脂が好ましい。融点を境
に急激に軟化溶融しない樹脂では、樹脂硬化に時間がか
かり、冷却中に剥離してしまう恐れがある。また、加熱
融着による接合温度は、熱可塑性樹脂の融点よりも４０
〜２００℃高い温度が望ましい。熱可塑性樹脂の融点に
満たない加熱温度では、十分に樹脂が軟化しないので安
定した接着強度が得られず、逆に熱可塑性樹脂の融点よ
りも２００℃を超える加熱温度では、樹脂の熱分解によ
って塗膜が脆くなる。[0008] Among these thermoplastic resins, a resin having a sharp thermal softening behavior and rapidly softening / melting at the melting point is preferable for rapid bonding. In the case of a resin that does not rapidly soften and melt from the melting point, it takes a long time to cure the resin and may be peeled off during cooling. In addition, the joining temperature by heat fusion is 40 degrees below the melting point of the thermoplastic resin.
A temperature that is higher by ~ 200 ° C is desirable. At a heating temperature lower than the melting point of the thermoplastic resin, the resin does not sufficiently soften, so that stable adhesive strength cannot be obtained. Conversely, at a heating temperature higher than the melting point of the thermoplastic resin by more than 200 ° C, the resin is thermally decomposed. The coating becomes brittle.
【０００９】熱可塑性樹脂は金属板の片面又は両面に塗
装するが、熱可塑性樹脂塗膜と熱硬化型塗膜や異材を重
ね合せる場合、乾燥塗膜厚が２〜２００μｍになるよう
に所定の樹脂を配合した塗料を塗装する。乾燥塗膜厚が
２μｍ未満では、金属板と熱可塑性樹脂の界面接着力が
不足し、剥離し易くなる。逆に乾燥塗膜厚が２００μｍ
を超えると、接着剤層が厚すぎて接着剤の凝集破壊を生
じ接着力が不足する。十分な接着力を得るためには、乾
燥塗膜厚を５〜１５０μｍになるように塗装することが
好ましい。熱可塑性樹脂塗膜同士を重ね合せる場合、片
面当りの乾燥塗膜厚が適正な値（凡そ半分の１〜１００
μｍ）になるように塗装する。The thermoplastic resin is coated on one or both sides of a metal plate. When a thermoplastic resin coating film and a thermosetting coating film or a different material are laminated, a predetermined thickness is set so that the dry coating film thickness is 2 to 200 μm. Paint with resin. If the dry coating thickness is less than 2 μm, the interfacial adhesion between the metal plate and the thermoplastic resin will be insufficient, and the coating will be easily peeled off. Conversely, the dry film thickness is 200μm
If it exceeds, the adhesive layer is too thick, causing cohesive failure of the adhesive and insufficient adhesive strength. In order to obtain a sufficient adhesive strength, it is preferable to apply the coating so that the dry coating film thickness is 5 to 150 μm. When the thermoplastic resin coating films are overlapped with each other, the dry coating film thickness per one side is an appropriate value (approximately half of 1 to 100).
μm).
【００１０】本発明の熱可塑性樹脂被覆金属板は、熱可
塑性樹脂層の下層や他面に熱硬化型塗膜が形成されてい
るものでもよい。熱硬化型塗膜としては、ポリエステル
樹脂、エポキシ樹脂、アクリル樹脂、フェノキシ樹脂等
がある。下地として使用される金属板は、例えばアルミ
ニウム板、銅板、普通鋼板、Ｚｎめっき鋼板、Ａｌめっ
き鋼板、Ｚｎ−Ａｌめっき鋼板、ステンレス鋼板等を適
用することが可能であり、またこれらの金属板は必要に
応じて機械的研磨、酸洗、リン酸塩処理、塗布型クロメ
ート処理等を施すことができる。The thermoplastic resin-coated metal plate of the present invention may have a thermosetting coating film formed on a lower layer or on another surface of the thermoplastic resin layer. Examples of the thermosetting coating film include a polyester resin, an epoxy resin, an acrylic resin, and a phenoxy resin. The metal plate used as the base may be, for example, an aluminum plate, a copper plate, a normal steel plate, a Zn-plated steel plate, an Al-plated steel plate, a Zn-Al-plated steel plate, a stainless steel plate, or the like. If necessary, mechanical polishing, pickling, phosphate treatment, coating type chromate treatment and the like can be performed.
【００１１】本発明の金属板接合物を分離する方法は、
非常に簡単であり、金属板接合物を使用している熱可塑
性樹脂の融点以上の温度で加熱することにより、容易に
分離・解体することができる。金属板接合物を分離する
に当り、熱可塑性樹脂を融点以上に加熱する手段として
は特に限定されず、例えば誘導加熱で接合部分だけを瞬
時に加熱して分離・分解してもよく、部分加熱が困難な
場合は金属接合物全体を挿入できる加熱炉等で加熱して
分離・解体してもよい。[0011] The method for separating a metal plate joint according to the present invention comprises:
It is very simple and can be easily separated and dismantled by heating at a temperature higher than the melting point of the thermoplastic resin using the metal plate joint. Means for heating the thermoplastic resin to a temperature equal to or higher than the melting point in separating the metal plate joint is not particularly limited. For example, only the joint may be instantaneously heated by induction heating to separate and disassemble. If it is difficult to perform separation and disassembly by heating in a heating furnace or the like into which the entire metal joint can be inserted.
【００１２】[0012]
【実施例】実施例１；板厚０．５ｍｍの亜鉛めっき鋼板
（片面当りの付着量：６０ｇ／ｍ2）に、樹脂成分を
０．４質量％含有する処理液で塗布型クロメート処理を
施し、表１に示すような接触面に対し樹脂系の異なるＡ
とＢの塗装鋼板を作製した。得られた塗装鋼板（Ａ、
Ｂ）の組合せで塗膜を面接触し、加熱圧着（温度：２０
０℃、加圧力：２ｋｇ／ｃｍ2、時間：２分間）を行い
試験片を作製した。性能試験として、Ｔ型剥離強度（Ｊ
ＩＳ Ｋ６８５４に準拠）を測定した。Ｔ型剥離強度測
定条件は、試験片サイズ２５ｍｍ×３００ｍｍとし、材
料試験機（オートグラフＡＧ−２０００Ｄ、島津製作所
製）を用い、引張り速度５０ｍｍ／分で行った。評価
は、Ｔ型剥離強度で１００Ｎ／２５ｍｍ以上有するもの
を接着性良好とした。Example 1 A coating type chromate treatment was applied to a galvanized steel sheet having a thickness of 0.5 mm (adhesion amount per side: 60 g / m 2 ) with a treatment liquid containing 0.4% by mass of a resin component. The contact surfaces as shown in Table 1 are different from each other in resin type A.
And B coated steel sheets were produced. The obtained painted steel plate (A,
In the combination of B), the coating films are brought into surface contact, and then heat-pressed (temperature: 20).
(0 ° C., pressure: 2 kg / cm 2 , time: 2 minutes) to produce a test piece. As a performance test, T-peel strength (J
IS K6854). The T-type peel strength measurement conditions were a test piece size of 25 mm x 300 mm, and a tensile test speed of 50 mm / min was performed using a material testing machine (Autograph AG-2000D, manufactured by Shimadzu Corporation). In the evaluation, those having a T-peel strength of 100 N / 25 mm or more were regarded as having good adhesiveness.
【００１３】[0013]
【表１】 [Table 1]
【００１４】表１に試験結果を示すとおり、本発明例１
〜７の材料は、Ｔ型剥離強度が１０７〜１６１Ｎ／２５
ｍｍと基準である１００Ｎ／２５ｍｍを上回り、金属板
の接合方法として十分使用できる。これに対し、比較例
８〜１４の材料はＴ型剥離強度がいずれも２０Ｎ／２５
ｍｍ以下であり、熱硬化型の樹脂塗膜では金属板の接合
方法として使用できないことが予測できる。As shown in Table 1, the results of the present invention are shown in Table 1.
The materials No. to No. 7 have a T-peel strength of 107 to 161 N / 25.
mm, which exceeds the standard of 100 N / 25 mm, and can be used sufficiently as a method for joining metal plates. In contrast, the materials of Comparative Examples 8 to 14 all have a T-peel strength of 20 N / 25.
mm or less, and it can be predicted that a thermosetting resin coating film cannot be used as a method for joining metal plates.
【００１５】実施例２；分離性の確認試験として、実施
例１で作製した試験片について、Ｔ型剥離で接合力の弱
い比較例８〜１４は表２に示す接着剤を用いて接合し、
２００℃の雰囲気温度のオーブン内に２分間加熱し、オ
ーブンから取り出した直後に剥離が容易にできるかどう
かを調査した。評価は容易に剥離できるものを○印、剥
離できないものを×印とした。Example 2 As a test for confirming the separability, Comparative Examples 8 to 14 having a weak bonding strength due to T-peeling were bonded using the adhesives shown in Table 2 with respect to the test pieces prepared in Example 1.
It was heated in an oven at an ambient temperature of 200 ° C. for 2 minutes, and it was investigated whether or not the film could be easily peeled immediately after being taken out of the oven. In the evaluation, those that can be easily peeled were marked with ○, and those that could not be peeled were marked with x.
【００１６】[0016]
【表２】 [Table 2]
【００１７】表２に試験結果を示すとおり、本発明例１
〜７の材料は分離性が良好であり、容易に分離・解体で
きることから、部品として再利用し易くリサイクル性に
優れている。これに対し、比較例８〜１４は簡単に分離
できず、再利用が困難でありリサイクルし難いことが予
想される。As shown in the test results in Table 2, Example 1 of the present invention
The materials No. to No. 7 have good separability and can be easily separated and disassembled, so that they can be easily reused as parts and have excellent recyclability. On the other hand, Comparative Examples 8 to 14 cannot be easily separated, are difficult to reuse, and are expected to be difficult to recycle.
【００１８】[0018]
【発明の効果】以上説明したとおり、本発明は、金属板
の少なくとも片面に熱可塑性樹脂を含む塗膜を形成し、
塗膜同士もしくは該塗膜と異材との接合及び分離が容易
なリサイクル性に優れた熱可塑性樹脂被覆金属板であ
り、熱可塑性樹脂被覆金属板の塗膜同士もしくは該塗膜
と異材を重ね合わせて熱融着して接合するので他材料や
煩雑な作業を必要とせず、製品に歪み等の疵が生じな
い。また、金属板接合物を熱可塑性樹脂の融点以上の温
度で加熱することにより容易に分離できる。したがっ
て、リサイクル時に煩雑な作業は必要とせず、本発明に
従った部品は再利用でき、廃棄物の低減ならびに資源を
有効活用できる。As described above, the present invention forms a coating film containing a thermoplastic resin on at least one surface of a metal plate,
It is a thermoplastic resin-coated metal plate with excellent recyclability that facilitates bonding and separation between coating films or between the coating film and dissimilar materials. Since it is joined by heat fusion, no other material or complicated work is required, and no flaw such as distortion occurs in the product. Further, the metal plate joint can be easily separated by heating at a temperature higher than the melting point of the thermoplastic resin. Therefore, no complicated work is required at the time of recycling, and the parts according to the present invention can be reused, thereby reducing waste and effectively utilizing resources.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 森 浩治 千葉県市川市高谷新町７番地の１ 日新製 鋼株式会社技術研究所内 Ｆターム(参考） 4D075 DA06 DB02 DC10 EA17 4F100 AB01A AK01B AK01C BA02 BA03 BA06 BA08 BA10B BA10C EC03B EC03C JB16B JB16C JL16 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Koji Mori 1-7-1, Takatani-Shimmachi, Ichikawa-shi, Chiba F-term (reference) in Nisshin Steel Co., Ltd. Technical Research Laboratory 4D075 DA06 DB02 DC10 EA17 4F100 AB01A AK01B AK01C BA02 BA03 BA06 BA08 BA10B BA10C EC03B EC03C JB16B JB16C JL16
Claims (3)
を含む塗膜を形成し、塗膜同士もしくは該塗膜と異材と
の接合及び分離が容易なリサイクル性に優れた熱可塑性
樹脂被覆金属板。1. A thermoplastic resin-coated metal plate having excellent recyclability in which a coating film containing a thermoplastic resin is formed on at least one surface of a metal plate, and the coating films or the coating film and a different material are easily bonded and separated. .
の塗膜同士もしくは該塗膜と異材を重ね合わせて熱融着
してなる金属板接合物。2. A metal sheet joined product obtained by heat-sealing the coated films of the thermoplastic resin-coated metal plate according to claim 1 or by laminating different materials with each other.
を含む塗膜を形成した塗膜同士もしくは該塗膜と異材を
重ねた熱融着接合物を、熱可塑性樹脂の融点以上の温度
で加熱することにより容易に分離できる金属板接合物の
分離方法。3. A heat-sealed joint in which a coating film containing a thermoplastic resin is formed on at least one surface of a metal plate, or a heat-sealed joint in which a different material is overlapped with the coating film is heated at a temperature equal to or higher than the melting point of the thermoplastic resin. A method for separating metal plate joints that can be easily separated by performing
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000203330A JP2002019016A (en) | 2000-07-05 | 2000-07-05 | Thermoplastic resin-coated metal plate excellent in recycling property, metal plate-joined object with the metal plate fusion-bonded, and method for separating the object |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000203330A JP2002019016A (en) | 2000-07-05 | 2000-07-05 | Thermoplastic resin-coated metal plate excellent in recycling property, metal plate-joined object with the metal plate fusion-bonded, and method for separating the object |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002019016A true JP2002019016A (en) | 2002-01-22 |
Family
ID=18700751
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000203330A Withdrawn JP2002019016A (en) | 2000-07-05 | 2000-07-05 | Thermoplastic resin-coated metal plate excellent in recycling property, metal plate-joined object with the metal plate fusion-bonded, and method for separating the object |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002019016A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015080463A1 (en) * | 2013-11-27 | 2015-06-04 | 주식회사 포스코 | Non-oriented electrical steel plate composition, method for manufacturing non-oriented electrical steel plate product, and non-oriented electrical steel plate product |
-
2000
- 2000-07-05 JP JP2000203330A patent/JP2002019016A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015080463A1 (en) * | 2013-11-27 | 2015-06-04 | 주식회사 포스코 | Non-oriented electrical steel plate composition, method for manufacturing non-oriented electrical steel plate product, and non-oriented electrical steel plate product |
| KR101561280B1 (en) | 2013-11-27 | 2015-10-16 | 주식회사 포스코 | Coating composition for non-oriented electrical steel, method of manufacturing non-oriented electrical product and non-oriented electrical product |
| US10556404B2 (en) | 2013-11-27 | 2020-02-11 | Posco | Composition for non-oriented electrical steel sheet, method of manufacturing non-oriented electrical steel sheet product, and non-oriented electrical steel sheet product |
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