JP6706523B2 - Electrical insulating paper - Google Patents
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- JP6706523B2 JP6706523B2 JP2016062152A JP2016062152A JP6706523B2 JP 6706523 B2 JP6706523 B2 JP 6706523B2 JP 2016062152 A JP2016062152 A JP 2016062152A JP 2016062152 A JP2016062152 A JP 2016062152A JP 6706523 B2 JP6706523 B2 JP 6706523B2
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Description
本発明は、電気絶縁紙に関する。更に詳しくは、変圧器用として好適な電気絶縁紙に関する。 The present invention relates to electrically insulating paper. More specifically, it relates to an electrically insulating paper suitable for a transformer.
電気機器、特に高電圧を発する機器を保護するために用いる電気絶縁紙には、優れた絶縁破壊性、機械的強度、寸法安定性等が必要である。そこで、電気絶縁紙としては、バルカナイズドファイバーが広く使用されている。また、特許文献１にはポリフェニレンサルファイド繊維を１０〜９０質量％の割合で含む原料繊維を湿式抄紙して得た単層又は多層の電気絶縁紙が開示されている。 Electrical insulating paper used to protect electrical equipment, especially equipment that emits high voltage, must have excellent dielectric breakdown properties, mechanical strength, dimensional stability, and the like. Therefore, vulcanized fiber is widely used as the electrically insulating paper. Further, Patent Document 1 discloses a single-layer or multi-layer electrical insulating paper obtained by wet papermaking of raw material fibers containing polyphenylene sulfide fibers in a proportion of 10 to 90% by mass.
しかしながら、バルカナイズドファイバーはその生産効率が比較的低い事や、製造工程で亜鉛化合物を大量に使用することから、高度な生産技術や排水の処理設備が必要となってくる。また、特許文献１に開示された電気絶縁紙は、ポリフェニレンサルファイド繊維を用い、さらに分散剤などの薬剤も使用することからコスト高となる問題があった。 However, since vulcanized fiber has a relatively low production efficiency and uses a large amount of zinc compounds in the manufacturing process, it requires advanced production technology and wastewater treatment equipment. Further, the electrical insulating paper disclosed in Patent Document 1 uses polyphenylene sulfide fiber and further uses a chemical agent such as a dispersant, which causes a problem of high cost.
そこで本発明は、絶縁破壊性、機械的強度及び寸法安定性に優れた電気絶縁紙を比較的安価に提供することを目的とする。また、パルプ以外の分散剤などの薬剤を使用することなく安価かつ簡便に電気絶縁紙を得ることもできる。 Therefore, an object of the present invention is to provide an electrically insulating paper excellent in dielectric breakdown property, mechanical strength and dimensional stability at a relatively low cost. In addition, an electrically insulating paper can be obtained inexpensively and easily without using a dispersant other than pulp.
本発明の電気絶縁紙は、未晒しクラフトパルプをパルプ中８５質量％以上の割合で含みカナダ標準濾水度（ＣＳＦ）が３００〜３６０ｍＬであるパルプを原料とし、密度が１．０ｇ／ｃｍ３以上であることを特徴とする。 The electric insulating paper of the present invention is made of pulp having unbleached kraft pulp in a proportion of 85% by mass or more in pulp and having a Canadian standard freeness (CSF) of 300 to 360 mL as a raw material, and a density of 1.0 g/cm 3. It is characterized by the above.
また、本発明においては、前記未晒しクラフトパルプの９０質量％以上が針葉樹未晒しクラフトパルプであってもよい。 Further, in the present invention, 90% by mass or more of the unbleached kraft pulp may be unbleached softwood kraft pulp.
また、本発明においては、原料であるパルプが未晒しクラフトパルプのみからなるとよく、さらに、原料として未晒しクラフトパルプのみが使用される電気絶縁紙であることが好ましい。 Further, in the present invention, it is preferable that the raw material pulp is composed only of unbleached kraft pulp, and further, it is preferable that the electrical insulating paper uses only unbleached kraft pulp as the raw material.
本発明によれば、絶縁破壊性、機械的強度及び寸法安定性に優れた絶縁紙を比較的安価に提供することが可能となる。 ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the insulating paper excellent in a dielectric breakdown property, mechanical strength, and dimensional stability comparatively cheaply.
本発明の電気絶縁紙は、未晒しクラフトパルプ（以下、「ＵＫＰ」と記載することがある）をパルプ中８５質量％以上の割合で含みカナダ標準濾水度（ＣＳＦ）が３００〜３６０ｍＬであるパルプを主成分とするものである。さらに好ましくは前記未晒しクラフトパルプのみからなる電気絶縁紙である。また、本発明においては、未晒しクラフトパルプをパルプ中８５質量％以上の割合で含みカナダ標準濾水度（ＣＳＦ）が３００〜３６０ｍＬであるパルプを含む原料が用いられる電気絶縁紙であり、好ましくは、原料として未晒しクラフトパルプをのみが用いられる電気絶縁紙である。ＵＫＰは、漂白工程を経ていないため、塩素系物質等の漂白薬品由来物の残留が無い。また、ＵＫＰは、漂白によるパルプ繊維へのダメージが無いことから、晒しクラフトパルプ（ＢＫＰ）よりもパルプ繊維自体が強靭であり、シートとした場合の強度にも優れる。また、ＵＫＰはリグニンを多く含むためか、ＵＫＰが８５質量％以上の割合で含む場合においては、パルプのみを用いて得られた紙であっても、すなわちサイズ剤や紙力剤などの製紙用添加剤を用いず抄紙された紙であっても、ある程度の耐水強度や乾燥紙力を持つものとなる。この結果、外部からの機械的応力や電気が印加された際にも耐久性を有する紙となり得る。 The electrical insulating paper of the present invention contains unbleached kraft pulp (hereinafter sometimes referred to as "UKP") in a proportion of 85% by mass or more in pulp, and has a Canadian standard freeness (CSF) of 300 to 360 mL. It is mainly composed of pulp. More preferably, it is an electrically insulating paper consisting only of the unbleached kraft pulp. Further, in the present invention, an electrically insulating paper using a raw material containing pulp which contains unbleached kraft pulp in a proportion of 85% by mass or more in pulp and has a Canadian standard freeness (CSF) of 300 to 360 mL, preferably Is an electrically insulating paper that uses only unbleached kraft pulp as a raw material. Since UKP does not undergo the bleaching step, there is no residue of bleaching chemicals-derived substances such as chlorine-based substances. Further, since UKP has no damage to the pulp fiber due to bleaching, the pulp fiber itself is tougher than the bleached kraft pulp (BKP), and is excellent in strength when formed into a sheet. Also, since UKP contains a large amount of lignin, when UKP is contained in a proportion of 85 mass% or more, even paper obtained using only pulp, that is, for papermaking such as sizing agents and paper strength agents Even paper made without additives will have some degree of water resistance and dry paper strength. As a result, the paper can be durable even when external mechanical stress or electricity is applied.
本発明の電気絶縁紙は、原料として、未晒しクラフトパルプを主成分として全パルプ中８５質量％以上の割合で用いる。好ましくは、ＵＫＰを全パルプ中９０質量％以上とし、さらに好ましくは全パルプを未晒しクラフトパルプとすればよい。未晒しクラフトパルプの配合量が８５質量％未満となると、抄紙機での抄紙の際に断紙が起こり易く安定した抄造ができない場合があり、紙の諸強度が低下するために絶縁紙としての適性を損ねるおそれがある。 The electrically insulating paper of the present invention contains unbleached kraft pulp as a main component at a ratio of 85% by mass or more based on the total pulp. Preferably, UKP is 90% by mass or more in the total pulp, and more preferably, the whole pulp is unbleached to be kraft pulp. If the content of unbleached kraft pulp is less than 85% by mass, paper breakage may occur easily during papermaking with a paper machine, and stable papermaking may not be possible, and various strengths of the paper may decrease, so It may impair suitability.
ＵＫＰ以外のパルプとしては、針葉樹漂白化学パルプ（ＮＢＫＰ）や広葉樹漂白化学パルプ（ＬＢＫＰ）などの晒しクラフトパルプを使用することができる。これらのパルプ中の割合としては１５％以下とし、好ましくは１０％以下とするとよい。また、強度の面からＮＢＫＰを使用することが好ましい。 As pulp other than UKP, bleached kraft pulp such as softwood bleached chemical pulp (NBKP) and hardwood bleached chemical pulp (LBKP) can be used. The proportion of these pulps is 15% or less, preferably 10% or less. Further, it is preferable to use NBKP from the viewpoint of strength.
本発明においては、未晒しクラフトパルプとして、針葉樹未晒しクラフトパルプ（ＮＵＫＰ）と広葉樹未晒しクラフトパルプ（ＬＵＫＰ）とを用いることが可能である。このうち、未晒しクラフトパルプの９０質量％以上をＮＵＫＰ、もしくは未晒しクラフトパルプの全てをＮＵＫＰとすることが好ましい。さらに、本発明においては、原料として未晒しクラフトパルプ、好ましくはＮＵＫＰのみから製造される電気絶縁紙が好ましい。本発明の電気絶縁紙は、紙力剤などの紙力を向上させるための製紙用添加剤を一切含有しないことが好ましく、一般的な製紙用添加剤を用いた紙よりも各種強度が得られ難い。そこで、本発明においては、比較的強度が得られやすいＮＵＫＰを原料パルプの主体として、好ましくはＮＵＫＰのみを用いることで紙の強度を確保する。未晒しクラフトパルプ中においてＮＵＫＰの配合量が９０質量％を下回ると、抄紙機での抄紙の際に断紙が起こり易く安定した抄造ができない場合があり、紙の諸強度が低下するために絶縁紙としての適性を損ねるおそれがある。 In the present invention, as the unbleached kraft pulp, it is possible to use unbleached softwood kraft pulp (NUKP) and unleaved bleached hardwood kraft pulp (LUKP). Of these, 90% by mass or more of the unbleached kraft pulp is preferably NUKP, or all of the unbleached kraft pulp is preferably NUKP. Further, in the present invention, unbleached kraft pulp as a raw material, preferably electric insulating paper produced only from NUKP, is preferred. The electrical insulating paper of the present invention preferably contains no papermaking additives such as paper strength agents for improving paper strength, and various strengths can be obtained as compared with papers using general papermaking additives. hard. Therefore, in the present invention, the strength of the paper is secured by using NUKP, which is relatively easy to obtain strength, as the main component of the raw material pulp, and preferably using only NUKP. If the content of NUKP in unbleached kraft pulp is less than 90% by mass, paper breakage may occur during papermaking on a paper machine, and stable papermaking may not be possible, resulting in a decrease in paper strength and insulation. It may impair suitability for paper.
原料パルプであるパルプには、叩解処理を施すことが必須である。適度な叩解処理を施し、パルプ繊維同志の絡み合いを促すことで引張強さや引裂強さ等の諸強度を向上させることができ、かつ、紙の地合を良好なものにできる。本発明においては、ＪＩＳ Ｐ ８１２１−２「パルプのろ水度試験方法」に規定されるカナダ標準濾水度（ＣＳＦ）が３００〜３６０ｍＬとなるように処理を行う。より好ましくは、３２０〜３４０ｍＬである。叩解処理が進み過ぎて濾水度が３００ｍＬよりも低くなると、パルプ繊維が短くなり過ぎ、引張強さや絶縁破壊に劣るようになる。反対に、叩解処理が不足し、３６０ｍＬよりも高くなると繊維のフィブリル化が十分でなく、パルプ繊維同志の絡み合いが少なくなり、絶縁破壊強度等の諸強度の向上効果を得られにくくなる。 It is essential that the pulp, which is a raw material pulp, be subjected to a beating treatment. By subjecting the pulp fibers to an appropriate beating treatment to promote the entanglement of the pulp fibers, it is possible to improve various strengths such as tensile strength and tear strength, and also to improve the texture of the paper. In the present invention, the treatment is carried out so that the Canadian standard freeness (CSF) defined in JIS P 8121-2 "Pulp freeness test method" is 300 to 360 mL. More preferably, it is 320 to 340 mL. When the beating process proceeds too much and the freeness becomes lower than 300 mL, the pulp fibers become too short and the tensile strength and the dielectric breakdown become poor. On the other hand, when the beating treatment is insufficient and the beating is higher than 360 mL, the fibrillation of the fibers is not sufficient, the pulp fibers are less entangled with each other, and it becomes difficult to obtain the effect of improving various strengths such as dielectric breakdown strength.
本発明の紙は、未晒しクラフトパルプをパルプ中８５質量％以上の割合で含みカナダ標準濾水度（ＣＳＦ）が３００〜３６０ｍＬであるパルプを含む原料を用い製造される電気絶縁紙であり、好ましくは、原料として未晒しクラフトパルプのみを用い製造される電気絶縁紙である。本発明の紙の抄紙方法は、一般的な紙の抄紙方法と同様に、原料となるパルプ繊維を水中に分散して原料スラリーとし、抄紙することで得られる。但し、原料スラリー中には、製紙用添加剤や抄紙における操業安定のための薬剤は一切添加しないことが好ましい。ここで、製紙用添加剤や操業安定のための薬剤としては、紙力剤、サイズ剤、歩留り向上剤、填料、着色剤、嵩高剤、濾水性向上剤、ｐＨ調整剤、蛍光増白剤、蛍光消色剤、ピッチコントロール剤、スライムコントロール剤、消泡剤、保水剤、分散剤、防腐剤等の汎用で用いられる添加剤や薬剤などの全てを対象とし、これらを一切添加しないことが好ましい。即ち、本発明の紙を抄紙する際の原料スラリーは、水にパルプのみ、好ましくは水にＵＫＰのみ、さらに好ましくは水にＮＵＫＰのみを分散させたものとすることが好ましい。これにより、環境負荷をかけることなく、安価かつ簡便に、パルプのみを原料とする電気絶縁紙、ＵＫＰのみを原料とする電気絶縁紙、またはＮＵＫＰのみを原料とする電気絶縁紙を得ることができる。 The paper of the present invention is an electrically insulating paper produced using a raw material containing unbleached kraft pulp in a proportion of 85% by mass or more in pulp and having a Canadian standard freeness (CSF) of 300 to 360 mL, Preferably, it is an electrically insulating paper produced using only unbleached kraft pulp as a raw material. The papermaking method of the paper of the present invention can be obtained by dispersing pulp fiber as a raw material in water to form a raw material slurry and papermaking, as in a general papermaking method. However, it is preferable that no additive for papermaking or a chemical for stabilizing operation in papermaking is added to the raw material slurry. Here, as a papermaking additive and a chemical agent for stable operation, a paper strength agent, a sizing agent, a retention improver, a filler, a colorant, a bulking agent, a drainage improver, a pH adjuster, an optical brightener, Fluorescent decoloring agent, pitch control agent, slime control agent, defoaming agent, water retention agent, dispersant, preservatives and other commonly used additives and agents are all targeted, and it is preferable not to add these at all . That is, the raw material slurry for making the paper of the present invention is preferably one in which only pulp is dispersed in water, preferably only UKP is dispersed in water, and more preferably only NUKP is dispersed in water. Thereby, it is possible to easily and inexpensively and easily obtain an electric insulating paper made only from pulp, an electric insulating paper made only from UKP, or an electric insulating paper made only from NUKP without giving an environmental load. .
本発明の電気絶縁紙の抄紙方法としては、特に限定するものではなく、長網式抄紙機や円網式抄紙機等の一般の抄紙機を用いて抄紙することができる。本発明においては、これらの中でも円網抄紙機で抄紙することが望ましい。円網式抄紙機は抄紙速度において長網式抄紙機よりも劣るのが一般的であるが、本発明のように製紙用添加剤を用いない場合においては、抄紙速度が比較的遅いことも相俟って、紙匹が形成し易い。また、バルカナイズドファイバーの製造に比べれば、十数倍の生産速度となる。尚、本発明では、繊維の凝集化（フロック化）を促す薬品の添加は行わないため、物理的なパルプ繊維の絡み合いや化学的な水酸基を介した水素結合、パルプに残留するリグニンによる接着性等によってパルプ繊維が集合し、シート化が行われるものと考えられる。こうした中、原料スラリー中のパルプの不均一な分散が起こると、結果的に地合の悪い紙となり、また、抄紙の際の断紙が起こり易くなる。従って、長網式抄紙機での抄紙においては、原料スラリー中のパルプ濃度と抄紙速度を適切に調整することは勿論の事、地合が良好になるようにワイヤーのシェイキング速度を調整し、Ｊ／Ｗ比を適切に制御し、繊維の配向性を整える中で、パルプ繊維のワイヤー上での分散の均一化を図ることが好ましい。また、円網式抄紙機においては、バット内部の原料スラリーを乱流させ、十分に混合された状態とすることは勿論の事、バットから原料スラリーをシリンダー上で脱水しシート形成させることで、抄紙速度並びにバットとシリンダー内部の圧力差を適切に制御し、地合と繊維の配向性を整えることが好ましい。 The method for making the electrically insulating paper of the present invention is not particularly limited, and the paper can be made using a general paper machine such as a Fourdrinier paper machine or a cylinder paper machine. In the present invention, among these, it is desirable to use a cylinder paper machine for papermaking. Cylinder type paper machines are generally inferior in papermaking speed to Fourdrinier paper machines, but when the additive for papermaking is not used as in the present invention, the papermaking speed is relatively slow. Moreover, it is easy to form a web. In addition, the production speed is more than ten times higher than the production of vulcanized fiber. In addition, in the present invention, since chemicals that promote aggregation (flocculation) of fibers are not added, physical pulp fiber entanglement and chemical hydrogen bonding through hydroxyl groups, and adhesiveness due to lignin remaining in pulp It is considered that the pulp fibers are aggregated by such as the above to form a sheet. Under these circumstances, if the pulp is unevenly dispersed in the raw material slurry, the result is poorly formed paper, and paper breakage easily occurs during papermaking. Therefore, in papermaking with a Fourdrinier paper machine, not only the pulp concentration in the raw material slurry and the papermaking speed are properly adjusted, but also the shaking speed of the wire is adjusted so that the formation is good. It is preferable that the dispersion of the pulp fibers on the wire be made uniform while the /W ratio is appropriately controlled and the orientation of the fibers is adjusted. Further, in the cylinder paper machine, turbulent flow of the raw material slurry inside the vat, not to mention the state of being sufficiently mixed, by dehydrating the raw material slurry from the vat on the cylinder to form a sheet, It is preferable to properly control the papermaking speed and the pressure difference between the vat and the cylinder to adjust the formation and the orientation of the fibers.
本発明の紙は、その紙層が単層であっても２以上の層であっても良い。２以上の層とする場合は、抄き合わせとするが、澱粉等の層間接着を高めるための接着剤は用いない。従って、抄き合わせの際には、地合が崩れない範囲でなるべく紙層水分を高め、層間強度がなるべく高くなるように調整することが望ましい。 The paper layer of the paper of the present invention may be a single layer or two or more layers. When two or more layers are used, they are combined, but no adhesive such as starch for enhancing interlayer adhesion is used. Therefore, it is desirable to adjust the water content of the paper layer as much as possible and the interlaminar strength to be as high as possible in the range where the formation is not damaged during the papermaking.
本発明の電気絶縁紙は、表面紙力剤や表面サイズ剤などの製紙薬品を含んだサイズプレス液を塗布したり、顔料塗工層を設けるなどのコーティング処理も行わない。 The electrically insulating paper of the present invention does not undergo a coating treatment such as applying a size press liquid containing a papermaking chemical such as a surface paper strength agent or a surface sizing agent, or providing a pigment coating layer.
そして、カレンダー処理やエンボス処理等の熱圧加工処理は行って構わない。カレンダー処理を行うことで、シート表面の平滑性や密度が高まることから、その後のシート同志の貼り合わせといった後加工への適性やシート単体の絶縁破壊強度等の諸強度が改善される。 Then, a hot pressing process such as a calendar process or an embossing process may be performed. By performing the calendering treatment, the smoothness and density of the sheet surface are increased, so that the suitability for subsequent processing such as the subsequent bonding of the sheets and the various strengths such as the dielectric breakdown strength of the sheet alone are improved.
本発明の紙の米坪に関しては、特に限定するものではないが、２００〜３００ｇ／ｍ２であることが好ましい。米坪が２００ｇ／ｍ２未満であると、紙力剤等の製紙用添加剤を用いていないことも有り、電気絶縁紙として絶縁破壊に耐えられなくなる、また、３００ｇ／ｍ２を超えると、層間強度の脆弱な部分が多く存在するようになり、これもまた、強度の面で懸念される。そして、裁断、切削、ラミ貼り、貼り合わせ等の後加工において、ハンドリングが悪くなってくる。また、紙の厚さとしては、０．１７〜０．２２ｍｍ程度でよい。 The grammage of the paper of the present invention is not particularly limited, but is preferably 200 to 300 g/m 2 . If the tsubo is less than 200 g/m 2 , it may not be possible to use a paper-making additive such as a paper-strengthening agent, and electrical insulation paper cannot withstand dielectric breakdown. If it exceeds 300 g/m 2 , There are now many fragile portions of interlaminar strength, which is also a concern in terms of strength. Then, in post-processing such as cutting, cutting, laminating and laminating, handling becomes poor. The thickness of the paper may be about 0.17 to 0.22 mm.
本発明の電気絶縁紙は、密度を１．０ｇ／ｃｍ３以上とする。好ましくは１．１ｇ／ｃｍ３以上であり、更に好ましくは１．２ｇ／ｃｍ３以上である。また、密度の上限としては、例えば１．５ｇ／ｃｍ３である。密度が１．０ｇ／ｃｍ３未満となると、絶縁破壊強度が得られにくくなる。密度はカレンダー処理を行うことにより、高くすることができる。例えば、カレンダー処理やオンマシンカレンダー処理を一定範囲の線圧で行うことにより所望の密度の電気絶縁紙を得ることができる。具体的には、本発明においては、例えば、オンマシンカレンダー処理の際に、常温で１ニップの１５〜８０ｋｇ／ｃｍの線圧で処理し、次いで、８０℃〜１１０℃のロール加熱条件で２〜４ニップ、１００〜１２０ｋｇ／ｃｍの線圧で平坦化処理することで適切な密度の電気絶縁紙を得ることができる。 The electric insulating paper of the present invention has a density of 1.0 g/cm 3 or more. It is preferably 1.1 g/cm 3 or more, and more preferably 1.2 g/cm 3 or more. The upper limit of the density is, for example, 1.5 g/cm 3 . When the density is less than 1.0 g/cm 3 , it becomes difficult to obtain dielectric breakdown strength. The density can be increased by calendering. For example, calendering or on-machine calendering can be performed at a linear pressure within a certain range to obtain an electrically insulating paper having a desired density. Specifically, in the present invention, for example, at the time of on-machine calendering, a linear pressure of 15 to 80 kg/cm for one nip is applied at room temperature, and then 2 to 80° C. to 110° C. under roll heating conditions. It is possible to obtain an electric insulating paper having an appropriate density by performing a flattening treatment with a linear pressure of 100 to 120 kg/cm for 4 nips.
本発明の電気絶縁紙は、絶縁破壊性に優れるものであるが、ＪＩＳ Ｃ ２１１０−１：２０１０に規定される絶縁破壊試験方法（気中方法）において、絶縁破壊強さが６．５ｋＶ／ｍｍ以上であることが好ましい。より好ましくは８．０ｋＶ／ｍｍ以上であり、更に好ましくは１０．０ｋＶ／ｍｍ以上である。絶縁破壊強さが６．５ｋＶ／ｍｍ未満となると、絶縁破壊性に劣り電気絶縁紙として使用しにくくなる。 The electrical insulating paper of the present invention is excellent in dielectric breakdown property, but has a dielectric breakdown strength of 6.5 kV/mm in the dielectric breakdown test method (in-air method) specified in JIS C 2110-1:2010. The above is preferable. It is more preferably 8.0 kV/mm or more, and further preferably 10.0 kV/mm or more. When the dielectric breakdown strength is less than 6.5 kV/mm, the dielectric breakdown property is poor and it becomes difficult to use as an electric insulating paper.
また、本発明の電気絶縁紙は、機械的強度に優れるものであるが、ＪＩＳ Ｐ ８１１３：２００６に規定される引張強さにおいて、繊維配向方向側（ＭＤ方向）で７０ＭＰａ以上、かつ繊維配向垂直方向側（ＣＤ方向）で３０ＭＰａ以上であることが好ましい。 Further, the electrical insulating paper of the present invention is excellent in mechanical strength, but has a tensile strength defined by JIS P 8113:2006 of 70 MPa or more on the fiber orientation direction side (MD direction) and a fiber orientation perpendicular direction. It is preferably 30 MPa or more on the direction side (CD direction).
また、本発明の電気絶縁紙は、寸法安定性に優れるものであるが、ＪＩＳ Ｐ ８１５３：２００６に規定される収縮率において、繊維配向方向側（ＭＤ方向）で１．０％以下、かつ繊維配向垂直方向側（ＣＤ方向）で２．０％以下、厚み方向で８．０％以下であることが好ましい。 Further, the electrically insulating paper of the present invention is excellent in dimensional stability, but at the shrinkage ratio defined in JIS P 8153:2006, 1.0% or less on the fiber orientation direction side (MD direction), and It is preferable that the content is 2.0% or less in the orientation vertical direction side (CD direction) and 8.0% or less in the thickness direction.
以下に実施例を挙げて本発明をより具体的に説明するが、本発明はそれらに限定されるものではない。なお、各実施例及び比較例における部や％といったものは、特に断らない限り、それぞれ質量部及び質量％を示す。 Hereinafter, the present invention will be described more specifically with reference to Examples, but the present invention is not limited thereto. In the examples and comparative examples, parts and% mean parts by mass and% by mass, respectively, unless otherwise specified.
＜実施例１＞
針葉樹未晒しクラフトパルプ（ＮＵＫＰ）１００部を、ダブルディスクリファイナーにて、濾水度を３３０ｍＬ（ＣＳＦ）となるように叩解処理を行い、パルプスラリーを得た。このパルプスラリーを円網式抄紙機で５層抄による抄紙を行い、その後、オンマシンカレンダー処理を行い、目的とする電気絶縁紙を得た。オンマシンカレンダー処理は、１段目は常温で１ニップの３５ｋｇ／ｃｍの線圧で処理し、次いで、９０℃のロール加熱条件で３ニップ、１１０ｋｇ／ｃｍの線圧で平坦化処理を行った。抄紙速度は、約４０ｍ／分であった。
<Example 1>
100 parts of unbleached softwood kraft pulp (NUKP) was beaten with a double disc refiner to a freeness of 330 mL (CSF) to obtain a pulp slurry. This pulp slurry was subjected to 5-layer papermaking using a cylinder paper machine, and then subjected to on-machine calendering to obtain the intended electrically insulating paper. In the on-machine calendering, the first step was performed at room temperature with a linear pressure of 35 kg/cm for one nip, and then with a linear heating of 3 nip and a linear pressure of 110 kg/cm for 90° C. roll heating conditions. .. The papermaking speed was about 40 m/min.
＜実施例２＞
抄速を約３０ｍ／分とし、オンマシンカレンダーの処理条件を、１段目を線圧３０ｋｇ／ｃｍとし、２段目を線圧１１５ｋｇ／ｃｍ、温度９５℃に変更した以外は、実施例１と同様にして電気絶縁紙を得た。
<Example 2>
Example 1 except that the machine speed was about 30 m/min, the processing conditions of the on-machine calender were changed to a linear pressure of 30 kg/cm for the first step, a linear pressure of 115 kg/cm for the second step, and a temperature of 95°C. An electric insulating paper was obtained in the same manner as.
＜実施例３＞
濾水度を３００ｍＬ（ＣＳＦ）に変更した以外は実施例１と同様にして電気絶縁紙を得た。
<Example 3>
An electrically insulating paper was obtained in the same manner as in Example 1 except that the freeness was changed to 300 mL (CSF).
＜参考例４＞
濾水度を３６０ｍＬ（ＣＳＦ）に変更した以外は実施例１と同様にして電気絶縁紙を得た。
< Reference Example 4>
Electrically insulating paper was obtained in the same manner as in Example 1 except that the freeness was changed to 360 mL (CSF).
＜参考例５＞
ＮＵＫＰ９０部と針葉樹晒しクラフトパルプ（ＮＢＫＰ）１０部とを用いてパルプスラリーを得た以外は実施例１と同様にして電気絶縁紙を得た。
< Reference example 5>
Electrically insulating paper was obtained in the same manner as in Example 1 except that 90 parts of NUKP and 10 parts of bleached softwood kraft pulp (NBKP) were used to obtain a pulp slurry.
＜実施例６＞
オンマシンカレンダーの１段目を線圧２０ｋｇ／ｃｍの条件へと変更した以外は実施例１と同様にして電気絶縁紙を得た。
<Example 6>
An electrically insulating paper was obtained in the same manner as in Example 1 except that the first stage of the on-machine calender was changed to the condition of linear pressure of 20 kg/cm.
＜実施例７＞
オンマシンカレンダーの１段目を線圧７０ｋｇ／ｃｍの条件へと変更した以外は実施例１と同様にして電気絶縁紙を得た。
<Example 7>
An electrically insulating paper was obtained in the same manner as in Example 1 except that the first stage of the on-machine calender was changed to the condition of linear pressure of 70 kg/cm.
＜比較例１＞
ＮＵＫＰ８０部とＮＢＫＰ２０部とを用いてパルプスラリーを得た以外は実施例１と同様にして電気絶縁紙を得た。
<Comparative Example 1>
Electrically insulating paper was obtained in the same manner as in Example 1 except that pulp slurry was obtained using 80 parts of NUKP and 20 parts of NBKP.
＜比較例２＞
濾水度を２９０ｍＬ（ＣＳＦ）に変更した以外は実施例１と同様にして電気絶縁紙を得た。
<Comparative example 2>
Electrically insulating paper was obtained in the same manner as in Example 1 except that the freeness was changed to 290 mL (CSF).
＜比較例３＞
濾水度を３７０ｍＬ（ＣＳＦ）に変更した以外は実施例１と同様にして電気絶縁紙を得た。
<Comparative example 3>
An electrically insulating paper was obtained in the same manner as in Example 1 except that the freeness was changed to 370 mL (CSF).
＜比較例４＞
オンマシンカレンダーの１段目を線圧１０ｋｇ／ｃｍの条件へと変更した以外は実施例１と同様にして電気絶縁紙を得た。
<Comparative example 4>
An electrically insulating paper was obtained in the same manner as in Example 1 except that the first stage of the on-machine calender was changed to the condition of linear pressure of 10 kg/cm.
各実施例及び比較例で得られた電気絶縁紙の構成の概要と各評価結果を表１に示す。尚、各評価は下記の方法で行った。 Table 1 shows the outline of the constitution of the electrically insulating paper obtained in each of the examples and the comparative examples and the evaluation results. In addition, each evaluation was performed by the following method.
（パルプのろ水度（ＣＳＦ））
ＪＩＳ Ｐ−８１２１−２に規定される測定法に準拠して測定した。
(Freeness of pulp (CSF))
It measured based on the measuring method prescribed|regulated to JIS P-8121-2.
（米坪）
ＪＩＳ Ｐ ８１２４：２０１１に規定される測定法に準拠して測定した。
(US square meter)
It measured based on the measuring method prescribed|regulated to JIS P8124:2011.
（紙厚）
ＪＩＳ Ｐ ８１１８：１９８８に規定される測定法に準拠して測定した。
(Paper thickness)
It measured based on the measuring method prescribed|regulated to JIS P8118:1988.
（絶縁破壊強さ）
絶縁破壊強さの測定には、絶縁破壊試験装置：ＹＳＴ−２４３−５０Ｒ（ヤマヨ試験器有限会社製）を使用し、ＪＩＳ Ｃ ２１１０−１：２０１０に規定される測定法に準拠して測定した。尚、測定値は気中の絶縁破壊強さである。
(Dielectric breakdown strength)
For the measurement of the dielectric breakdown strength, a dielectric breakdown test device: YST-243-50R (manufactured by Yamayo Tester Co., Ltd.) was used and measured in accordance with the measuring method specified in JIS C 2110-1:2010. .. The measured value is the dielectric breakdown strength in air.
（引張強さ）
ＪＩＳ Ｐ ８１１３：２００６に規定される測定法に準拠して繊維方向（ＭＤ方向）及び横方向（ＣＤ方向）について測定した。
(Tensile strength)
The fiber direction (MD direction) and the transverse direction (CD direction) were measured according to the measuring method specified in JIS P 8113:2006.
（収縮率）
ＪＩＳ Ｐ ８１５３：２００６に規定される測定法に準拠して、繊維方向（ＭＤ方向）及び横方向（ＣＤ方向）について測定した。
(Shrinkage factor)
The fiber direction (MD direction) and the transverse direction (CD direction) were measured according to the measuring method defined in JIS P 8153:2006.
表１に示す通り、各実施例で得られた本発明の電気絶縁紙は絶縁破壊性、機械的強度及び寸法安定性に優れるものであった。絶縁破壊強さについても、変圧器用の絶縁紙としての特性を満足している。 As shown in Table 1, the electrical insulating paper of the present invention obtained in each example was excellent in dielectric breakdown property, mechanical strength and dimensional stability. Regarding the dielectric breakdown strength, it also satisfies the characteristics of insulating paper for transformers.
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