JP4881899B2 - Kraft paper for wire wrapping - Google Patents
Kraft paper for wire wrapping Download PDFInfo
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- JP4881899B2 JP4881899B2 JP2008050402A JP2008050402A JP4881899B2 JP 4881899 B2 JP4881899 B2 JP 4881899B2 JP 2008050402 A JP2008050402 A JP 2008050402A JP 2008050402 A JP2008050402 A JP 2008050402A JP 4881899 B2 JP4881899 B2 JP 4881899B2
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- 239000002655 kraft paper Substances 0.000 title claims description 108
- 238000010618 wire wrap Methods 0.000 title claims description 19
- 239000000123 paper Substances 0.000 claims description 69
- 239000011122 softwood Substances 0.000 claims description 38
- 239000002994 raw material Substances 0.000 claims description 18
- 244000025254 Cannabis sativa Species 0.000 description 16
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 16
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 16
- 235000009120 camo Nutrition 0.000 description 16
- 235000005607 chanvre indien Nutrition 0.000 description 16
- 239000011487 hemp Substances 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 13
- 238000002156 mixing Methods 0.000 description 13
- 238000004519 manufacturing process Methods 0.000 description 11
- 239000000835 fiber Substances 0.000 description 9
- 229920001131 Pulp (paper) Polymers 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 229920000098 polyolefin Polymers 0.000 description 4
- 240000000907 Musa textilis Species 0.000 description 3
- 239000011121 hardwood Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000010009 beating Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 241000218631 Coniferophyta Species 0.000 description 1
- 229920000297 Rayon Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 239000013054 paper strength agent Substances 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 239000002964 rayon Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Landscapes
- Paper (AREA)
- Organic Insulating Materials (AREA)
Description
本発明は、クラフト紙に関するものであり、特に電線内の配線を束ねる電線巻紙用途に適したクラフト紙に関するものである。 The present invention relates to kraft paper, and more particularly to kraft paper suitable for electric wire wrapping for bundling wires in electric wires.
電気絶縁紙は、コンデンサーの誘導体や電力ケーブル等の各種電気機器の中に組み込まれ、電気絶縁を要する種々の用途に用いられる。 Electrical insulating paper is incorporated into various electrical devices such as capacitor derivatives and power cables, and is used for various applications that require electrical insulation.
電気絶縁紙としては、1枚もしくは2枚のクラフト絶縁紙をポリオレフィン樹脂を結合剤として押出し機で溶融押出しながら一体化させたものや（特許文献１参照）、繊維紙層とポリオレフィンラミネートにおいて、あらかじめ凹凸を機械的に付与し、溶融押出しポリオレフィン層と一体化した絶縁紙等が知られている（特許文献２参照）。 As the electrical insulating paper, one or two kraft insulating papers integrated with a polyolefin resin as a binder while being melt-extruded with an extruder (see Patent Document 1), a fiber paper layer and a polyolefin laminate, An insulating paper or the like that mechanically imparts unevenness and is integrated with a melt-extruded polyolefin layer is known (see Patent Document 2).
紙はもともと絶縁であるが、そこに誘電特性と高い機械的特性とを持つポリオレフィン等をラミネートすることで、超高圧ケーブルのような電気機器材料として実用化されている。これらのラミネート紙は、電力ケーブルの絶縁層の一部分に巻回して用いるためには有用であるものの、ポリオレフィン等の合成樹脂をラミネートすることは、二次加工の手間が掛かり、加えてコストアップの問題がある。例えば、電線を束ねるために用いられる電線巻紙用途として用いる場合には、ラミネート層を有さず、より薄くより低コストのクラフト紙の方が好ましい。より薄いことにより、巻き数を調整して任意の厚さとすることができる。 Paper is originally an insulating material, but it is put into practical use as an electrical equipment material such as an ultra-high voltage cable by laminating polyolefin or the like having dielectric properties and high mechanical properties. Although these laminated papers are useful for being wound around a part of the insulating layer of a power cable, laminating a synthetic resin such as polyolefin takes time for secondary processing and in addition increases costs. There's a problem. For example, when it is used as an electric wire wrapping used for bundling electric wires, it is preferable to use kraft paper that is thinner and less costly without a laminate layer. By making it thinner, the number of turns can be adjusted to an arbitrary thickness.
このような電線巻紙用途として、パルプ原料にマニラ麻を混合し抄紙したクラフト紙が知られている。マニラ麻は引張強度と伸びに優れるため、マニラ麻を混合したクラフト紙により電線内の配線を束ね、カバー内にきれいに収めることが出来るからである。
しかしながら、クラフト紙を電線巻紙用途で用いる場合、抄紙後のクラフト紙に４ｍｍ程度の巾のスリットを入れ、テープ状に裁断して、束ねた配線にらせん状に巻きつけて用いる。このような使用方法において、麻を混抄したクラフト紙の場合には、麻の結束が原因で、スリット加工時に紙切れが生じやすいという問題があった。 However, when kraft paper is used for electric wire wrapping, a slit having a width of about 4 mm is inserted into the kraft paper after paper making, cut into a tape shape, and wound around a bundled wiring in a spiral shape. In such a method of use, in the case of kraft paper mixed with hemp, there is a problem that paper breakage tends to occur during slit processing due to hemp binding.
上述の問題点を解決するため、本発明は、麻を配合しなくても、電線巻紙として適した引張強度および伸びを有するクラフト紙を提供することを目的とする。 In order to solve the above-mentioned problems, an object of the present invention is to provide a kraft paper having a tensile strength and an elongation suitable as an electric wire wrapping paper without blending hemp.
本発明のクラフト紙は、麻を配合しなくても、電線巻紙として適した引張強度と伸びを有する。 The kraft paper of the present invention has a tensile strength and elongation suitable as an electric wire wrapping paper without blending hemp.
上記目的を達成するために、本発明のクラフト紙は、少なくとも2種類の異なるフリーネスを有する針葉樹クラフトパルプを含む原料パルプからなり、ＪＩＳ Ｃ２１１１：２００２に準拠した坪量が１５〜３５ｇ／ｍ2、ＪＩＳ Ｃ２１１１：２００２に準拠した縦方向の伸びが１．８〜３．６％、ＪＩＳ Ｃ２１１１：２００２に準拠した縦方向の引張強度が１．６０〜４．５０ｋＮ／ｍである。 In order to achieve the above object, the kraft paper of the present invention comprises a raw material pulp containing softwood kraft pulp having at least two different freenesses, and has a basis weight of 15 to 35 g / m 2 according to JIS C2111: 2002, The longitudinal elongation according to JIS C2111: 2002 is 1.8 to 3.6%, and the tensile strength in the longitudinal direction according to JIS C2111: 2002 is 1.60 to 4.50 kN / m.
上記クラフト紙において、好ましくは、前記原料パルプは、ＪＩＳ Ｐ８１２１に準拠したカナダ標準フリーネスが３４０〜３６０ｍｌの第１の針葉樹クラフトパルプと、ＪＩＳ Ｐ８１２１に準拠したカナダ標準フリーネスが６４０〜６６０ｍｌの第２の針葉樹クラフトパルプと、を含み、前記原料パルプ中に、第１の針葉樹クラフトパルプが５０〜９０質量％含まれ、第２の針葉樹クラフトパルプが１０〜５０質量％含まれる。 In the kraft paper, preferably, the raw pulp is a first softwood kraft pulp having a Canadian standard freeness of 340 to 360 ml in accordance with JIS P8121, and a second softwood kraft pulp having a Canadian standard freeness of 640 to 660 ml in accordance with JIS P8121. Softwood kraft pulp, 50 to 90% by weight of the first softwood kraft pulp and 10 to 50% by weight of the second softwood kraft pulp.
上記伸びおよび引張強度を達成するためには、クラフト紙におけるＪＩＳ Ｐ８１２７に準拠した抄紙後の水分含有率が、３．０〜７．０質量％であることが好ましい。 In order to achieve the above-mentioned elongation and tensile strength, it is preferable that the moisture content after papermaking in kraft paper in accordance with JIS P8127 is 3.0 to 7.0% by mass.
上記クラフト紙は、電線巻紙用に好ましく用いられる。特に電線巻紙の場合、ＪＩＳ Ｃ２１１１：２００２に準拠した紙厚が５枚重ねで、１２５μｍ〜２７５μｍであることが好ましい。 The kraft paper is preferably used for electric wire wrapping paper. In particular, in the case of wire wrapping paper, it is preferable that the paper thickness conforming to JIS C2111: 2002 is five layers and is 125 μm to 275 μm.
以下、本発明にかかるクラフト紙について、詳細に説明する。なお、以下に詳述する形態は、本発明にかかるクラフト紙を電線巻紙用途に用いる場合に特に好ましい形態である。 Hereinafter, the craft paper according to the present invention will be described in detail. In addition, the form explained in full detail below is a particularly preferable form when the kraft paper according to the present invention is used for electric wire wrapping.
本発明のクラフト紙は、原料パルプ中に、少なくとも2種類の異なるフリーネスを有する針葉樹クラフトパルプを主原料パルプとして含み、ＪＩＳ Ｃ２１１１：２００２に準拠した坪量が１５〜３５ｇ／ｍ2、縦方向の伸びが１．８〜３．６％、縦方向の引張強度が１．６０〜４．５０ｋＮ／ｍである。 The kraft paper of the present invention contains at least two kinds of softwood kraft pulp having different freeness as a main raw material pulp, and has a basis weight of 15 to 35 g / m 2 in accordance with JIS C2111: 2002, in the longitudinal direction. The elongation is 1.8 to 3.6%, and the tensile strength in the machine direction is 1.60 to 4.50 kN / m.
針葉樹クラフトパルプとしては、針葉樹未晒クラフトパルプ（ＮＵＫＰ）、針葉樹晒クラフトパルプ（ＮＢＫＰ）いずれをも使用することができるが、ＮＢＫＰは、晒すことにより、十分なリグニンが溶出し、繊維が膨潤することで柔軟性を有する紙となる点から本発明においては好ましく用いられる。パルプ原料としては、針葉樹クラフトパルプと組み合わせて、広葉樹未晒クラフトパルプ（ＬＵＫＰ）、広葉樹晒クラフトパルプ（ＬＢＫＰ）等の化学パルプ；サーモメカニカルパルプ（ＴＭＰ）、加圧ストーングランドパルプ（ＰＧＷ）等の機械パルプ；ディンギングパルプ（ＤＩＰ）、ウェストパルプ（ＷＰ）等の化学パルプや機械パルプ由来の古紙パルプ等を使用できるが、原料パルプ中、針葉樹クラフトパルプが８０〜１００質量％であることが好ましい。針葉樹クラフトパルプは、例えば広葉樹クラフトパルプに比べ繊維長があるため、繊維間の結合が多くなり紙力をアップさせる利点を有する。 As the softwood kraft pulp, either softwood unbleached kraft pulp (NUKP) or softwood bleached kraft pulp (NBKP) can be used. However, when exposed to NBKP, sufficient lignin is eluted and the fibers swell. Therefore, it is preferably used in the present invention from the viewpoint that the paper has flexibility. Pulp raw materials are combined with softwood kraft pulp, chemical pulp such as hardwood unbleached kraft pulp (LUKP), hardwood bleached kraft pulp (LBKP), etc .; thermomechanical pulp (TMP), pressurized stone ground pulp (PGW), etc. Mechanical pulp: Chemical pulp such as Dinging Pulp (DIP) and West Pulp (WP), used paper pulp derived from mechanical pulp, and the like can be used, but the conifer kraft pulp is preferably 80 to 100% by mass in the raw material pulp. . Since softwood kraft pulp has a fiber length as compared with, for example, hardwood kraft pulp, there is an advantage that the bonding between fibers increases and paper strength is increased.
また、原料パルプ中に麻が含まれていてもよい。麻は、強度、伸びに優れるという特性を有し、電線巻紙用途に用いる場合に要求される特性をクラフト紙へ付与する点から好ましいが、結束しスリッター加工の際の紙切れの原因となる点から好ましくない。なお、本明細書での紙切れとは、パルプの結束等が原因で、スリッターを入れた方向とは違う方向に紙が裂けることをいう。したがって、麻を混抄させる場合は、結束が生じない程度の配合量とする。さらに、上述の原料パルプとともに、不織布繊維、レーヨン繊維等を混抄してもよい。 Moreover, hemp may be contained in the raw material pulp. Hemp has the characteristics of excellent strength and elongation, and is preferable from the viewpoint of imparting the characteristics required when used for wire wrapping to kraft paper, but it binds and causes paper breakage during slitting. It is not preferable. In addition, the piece of paper in the present specification means that the paper is torn in a direction different from the direction in which the slitter is inserted due to binding of pulp or the like. Therefore, when hemp is mixed, the blending amount is set so as not to cause binding. Further, non-woven fibers, rayon fibers and the like may be mixed with the above-mentioned raw material pulp.
本発明においては、少なくとも2種類の異なるフリーネスを有する針葉樹クラフトパルプを用いる。すなわち、低フリーネス針葉樹クラフトパルプ（第１の針葉樹クラフトパルプ）と高フリーネス針葉樹クラフトパルプ（第２の針葉樹クラフトパルプ）の２種類の異なるフリーネスを有する針葉樹クラフトパルプを用いる。このような原料パルプを用いることにより、優れた伸びと引張強度を有するクラフト紙を製造することができる。すなわち、高フリーネスの針葉樹クラフトパルプからは長繊維により伸びを確保でき、低フリーネスの針葉樹クラフトパルプからは短繊維により引張強度を確保し、麻を配合しなくとも優れた伸びと引張強度を有するクラフト紙を提供することが可能となる。 In the present invention, softwood kraft pulp having at least two different freenesses is used. That is, softwood kraft pulp having two different types of freeness, low freeness softwood kraft pulp (first softwood kraft pulp) and high freeness softwood kraft pulp (second softwood kraft pulp) is used. By using such raw material pulp, kraft paper having excellent elongation and tensile strength can be produced. In other words, it is possible to ensure elongation from long fibers from high-freeness softwood kraft pulp, and to secure tensile strength from short fibers from low-freeness softwood kraft pulp, which has excellent elongation and tensile strength without blending hemp. Paper can be provided.
また、麻を混抄し所望の伸びと引張強度を確保する従来の電線巻紙においては、抄紙性が悪く結束ができるという問題が発生していたが、本発明においては、結束が問題となるような量の麻を配合することなく所望の引張強度および伸びが得られるので、良好な抄紙性を維持できる。本発明において、麻を配合する場合には麻の原料パルプ中の配合量は５〜１５質量％であることが好ましく、さらには、７〜１０質量％であることが好ましい。１５質量％を超えると、麻の結束による紙切れが生じる問題がある。 In addition, in the conventional wire wrapping paper in which hemp is mixed and the desired elongation and tensile strength are ensured, there has been a problem that the paper-making property is poor and binding can occur, but in the present invention, binding is a problem. Since desired tensile strength and elongation can be obtained without blending an amount of hemp, good papermaking properties can be maintained. In the present invention, when hemp is blended, the blending amount of hemp in the raw material pulp is preferably 5 to 15% by mass, and more preferably 7 to 10% by mass. If it exceeds 15% by mass, there is a problem that paper breakage occurs due to hemp binding.
高フリーネス針葉樹クラフトパルプとしては、ＪＩＳ P ８１２１に準拠したカナダ標準フリーネスが６４０〜６６０ｍｌのものを使用することが好ましく、さらに好ましくは、６４５〜６５５ｍｌのものを使用する。６４０ｍｌ未満となると、十分な伸び率を確保出来ない問題があり、６６０ｍｌを超えると、引張強度が弱くなる問題がある。また、低フリーネス針葉樹クラフトパルプとしては、ＪＩＳ P ８１２１に準拠したカナダ標準フリーネスが３４０〜３６０ｍｌのものを使用することが好ましく、さらに好ましくは、３４５〜３５５ｍｌのものを使用する。３４０ｍｌ未満となると、十分な伸び率を確保出来ない問題があり、３６０ｍｌを超えると、引張強度が弱くなる問題がある。 As the high freeness softwood kraft pulp, it is preferable to use one having a Canadian standard freeness according to JIS P 8121 of 640 to 660 ml, and more preferably 645 to 655 ml. When the amount is less than 640 ml, there is a problem that a sufficient elongation cannot be secured, and when the amount exceeds 660 ml, there is a problem that the tensile strength is weakened. Further, as the low freeness softwood kraft pulp, it is preferable to use a Canadian standard freeness of 340 to 360 ml according to JIS P 8121, more preferably 345 to 355 ml. When it is less than 340 ml, there is a problem that a sufficient elongation cannot be secured, and when it exceeds 360 ml, there is a problem that the tensile strength is weakened.
低フリーネス針葉樹クラフトパルプの原料パルプ中の配合量は、５０〜９０質量％であることが好ましく、さらに好ましくは７０〜９０質量％である。低フリーネス針葉樹クラフトパルプの配合量が５０質量％未満になると、十分な伸び率を確保することが難しく、９０質量％を超えると、引張強度が弱くなる問題がある。一方、高フリーネス針葉樹クラフトパルプの原料パルプ中の配合量は、１０〜５０質量％であることが好ましく、さらに好ましくは、２０〜４０質量％である。１０質量％未満となると、引張強度が弱くなる問題があり、５０質量％を超えると十分な伸び率を確保出来ない問題がある。また、低フリーネス針葉樹クラフトパルプを５０〜９０質量％の範囲内で配合することで、短繊維の配合により紙の密度を高めることができ、紙厚を薄く維持することができる。 The blending amount of the low freeness softwood kraft pulp in the raw material pulp is preferably 50 to 90% by mass, and more preferably 70 to 90% by mass. When the blending amount of the low freeness softwood kraft pulp is less than 50% by mass, it is difficult to ensure a sufficient elongation, and when it exceeds 90% by mass, there is a problem that the tensile strength is weakened. On the other hand, it is preferable that the compounding quantity in the raw material pulp of a high freeness softwood kraft pulp is 10-50 mass%, More preferably, it is 20-40 mass%. When the amount is less than 10% by mass, there is a problem that the tensile strength is weakened. When the amount exceeds 50% by mass, there is a problem that a sufficient elongation cannot be secured. Further, by blending the low freeness softwood kraft pulp in the range of 50 to 90% by mass, the density of the paper can be increased by blending the short fibers, and the paper thickness can be kept thin.
本発明におけるクラフト紙の製造方法としては、円網抄紙機、長網抄紙機、短網抄紙機、ツインワイヤー抄紙機等、使用することができるが、円網抄紙機は、地合の均一性を確保できるので本発明のような低坪量の抄紙に適しており、また縦方向の紙力強度を高めることができる点で好ましい。なお、原料の調整工程においては、低フリーネス針葉樹クラフトパルプ、高フリーネス針葉樹クラフトパルプ、そしてその他のパルプを添加する場合にはその他のパルプを混合するとともに、分散剤、紙力剤、消泡剤等の各種添加剤を必要に応じて添加することができる。各針葉樹クラフトパルプは、叩解工程において所望のフリーネスに調整する。低フリーネス針葉樹クラフトパルプ、高フリーネス針葉樹クラフトパルプをそれぞれ調製する叩解工程において、他のパルプが含まれていてもよい。 As the method for producing kraft paper in the present invention, a circular net paper machine, a long net paper machine, a short net paper machine, a twin wire paper machine, etc. can be used. Is suitable for papermaking with a low basis weight as in the present invention, and is preferable in that the strength of paper strength in the vertical direction can be increased. In addition, in the raw material adjustment process, when adding low freeness softwood kraft pulp, high freeness softwood kraft pulp, and other pulp, other pulp is mixed, dispersing agent, paper strength agent, antifoaming agent, etc. These various additives can be added as necessary. Each softwood kraft pulp is adjusted to the desired freeness in the beating process. In the beating step of preparing the low freeness softwood kraft pulp and the high freeness softwood kraft pulp, other pulps may be included.
本発明に係るクラフト紙は、抄紙後の水分含有率が３．０〜７．０質量％であることが好ましく、さらには４．０〜６．０質量％であることが好ましい。水分含有率が３．０質量％未満となると、地合が悪くなる問題に加え、伸び率が低くなる問題があり、７．０質量％を超えると引張強度を維持できない問題がある。なお、水分含有率はクラフト紙の保管状態、保管期間等に応じて変化するが、使用時においても上記水分含有率が維持されていることが好ましい。水分含有率の測定方法は、ＪＩＳ P ８１２７に準拠して測定する。。水分含有率は、ドライヤーの圧力を変化させることにより、ドライヤー表面の温度を調整し、所望の値となるようにする。 The kraft paper according to the present invention preferably has a water content after paper making of 3.0 to 7.0% by mass, more preferably 4.0 to 6.0% by mass. If the moisture content is less than 3.0% by mass, in addition to the problem of poor formation, there is a problem that the elongation rate is low, and if it exceeds 7.0% by mass, there is a problem that the tensile strength cannot be maintained. In addition, although a moisture content changes according to the storage state of a kraft paper, a storage period, etc., it is preferable that the said moisture content is maintained also at the time of use. The method for measuring the moisture content is measured in accordance with JIS P 8127. . The moisture content is adjusted to a desired value by adjusting the temperature of the dryer surface by changing the pressure of the dryer.
本発明にかかるクラフト紙は、ＪＩＳ Ｃ２１１１：２００２に準拠した紙厚が５枚重ねで１２５μｍ〜２７５μｍであること好ましいく、一枚あたりの紙厚は２５〜５５μｍであることが好ましい。１２５μｍ未満となると、十分な引張強度が維持できず、電線巻紙用途で用いる場合に、束ねた配線にらせん状に巻きつけることが難しいという問題がある。一方、２７５μｍを超えると、紙の厚みが嵩んでしまい、カバー内にきれいに収めることが難しいという問題がある。 The kraft paper according to the present invention preferably has a paper thickness in accordance with JIS C2111: 2002 of 125 μm to 275 μm when five sheets are stacked, and the paper thickness per sheet is preferably 25 to 55 μm. When the thickness is less than 125 μm, sufficient tensile strength cannot be maintained, and there is a problem that it is difficult to spirally wind the bundled wiring when used for wire wrapping. On the other hand, if it exceeds 275 μm, the thickness of the paper increases, and there is a problem that it is difficult to fit it in the cover.
本発明においては、紙の厚みの均一性を出すために、低フリーネス針葉樹クラフトパルプの配合量を所定の範囲とし、紙の密度を高め、紙厚を薄く維持することに加え、プレス圧、タッチ圧を調整して紙の厚みを薄く均一にすることができる。 In the present invention, in order to bring out the uniformity of the paper thickness, the blending amount of the low freeness softwood kraft pulp is set within a predetermined range, the paper density is increased, the paper thickness is kept thin, press pressure, touch The pressure can be adjusted to make the paper thickness thin and uniform.
また、本発明のクラフト紙は、ＪＩＳ Ｃ２１１１：２００２に準拠した坪量が１５ｇ〜３５ｇ／ｍ2となるようにする。１５ｇ／ｍ2未満となると所望の紙厚を確保することが難しく、また３５ｇ／ｍ2を超えると、紙厚が嵩み、電線巻紙として用いた場合にカバー内にきれいに収めることが難しいという問題がある。 Also, Kraft paper of the present invention, JIS C2111: basis weight conforming to 2002 is made to be a 15g~35g / m 2. When it is less than 15 g / m 2, it is difficult to secure a desired paper thickness, and when it exceeds 35 g / m 2 , the paper thickness increases, and it is difficult to neatly fit in the cover when used as a wire wrapping paper. There is.
そして、このようにして抄造されたクラフト紙は、ＪＩＳ Ｃ ２１１１：２００２に準拠した縦方向の伸び率が１．８〜３．６％となるようにする。縦方向の伸び率が１．８％未満となると、紙が断裂しやすくなり、４ｍｍ程度巾のスリット加工を行う際に、紙切れが生じやすいという問題がある。一方、伸び率が３．６％を超えると、所望の引張強度を確保しにくいという問題がある。さらに、本発明のクラフト紙は、ＪＩＳ Ｃ２１１１：２００２に準拠した縦方向の引張強度が１．６０〜４．５０ｋＮ／ｍとなるようにする。引張り強度が１．６０KN／ｍ未満となると、電線にらせん状に巻きつける際に紙が切れやすい傾向がある。 And the kraft paper made in this way is made to become 1.8 to 3.6% of the elongation rate of the vertical direction based on JISC2111: 2002. When the elongation in the vertical direction is less than 1.8%, the paper is easily torn, and there is a problem that the paper is likely to be cut when slit processing with a width of about 4 mm is performed. On the other hand, when the elongation percentage exceeds 3.6%, there is a problem that it is difficult to secure a desired tensile strength. Further, the kraft paper of the present invention has a longitudinal tensile strength in accordance with JIS C2111: 2002 of 1.60 to 4.50 kN / m. When the tensile strength is less than 1.60 KN / m, the paper tends to be cut easily when it is wound around the electric wire in a spiral shape.
（用途）
本発明のクラフト紙の用途は特に限定されないが、例えば電気機器内に組み込まれる絶縁紙としての用途を有し、特に複数の電線を束ねコード内において緩衝材として機能する電線巻紙に適している。
(Use)
The use of the kraft paper of the present invention is not particularly limited. For example, the kraft paper has a use as an insulating paper incorporated in an electric device, and is particularly suitable for an electric wire wrapping paper that functions as a cushioning material in a bundled cord.
以下に、実施例に基づいて本発明をより詳細に説明するが、本発明はこれらの実施例に限定されるものではない。以下において、「フリーネス」はＪＩＳ P ８１２１に準拠したカナダ標準フリーネスとし、「坪量」はＪＩＳ Ｃ２１１１：２００２に準拠した坪量とし、「紙厚」はＪＩＳ Ｃ２１１１：２００２に準拠した紙厚とする。 Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples. In the following, “freeness” is the Canadian standard freeness according to JIS P 8121, “basis weight” is the basis weight according to JIS C2111: 2002, and “paper thickness” is the paper thickness according to JIS C2111: 2002. .
（実施例１）
低フリーネスＮＢＫＰ（フリーネス３５０ｍｌ）８０質量％と、高フリーネスＮＢＫＰ（フリーネス６５０ｍｌ）２０質量％とからなる原料パルプを抄紙し、乾燥工程を経て、坪量が２０ｇ／ｍ2、５枚重ねの紙厚が３０μｍ、水分含有率が５．５％のクラフト紙を得た。
Example 1
A raw pulp composed of 80% by mass of low freeness NBKP (freeness 350 ml) and 20% by mass of high freeness NBKP (650 ml of freeness) is made into a paper, and after a drying process, the basis weight is 20 g / m 2 , and the paper thickness is 5 layers. Of kraft paper having a water content of 5.5%.
（参考例１、実施例３〜５）
低フリーネスＮＢＫＰ（フリーネス３５０ｍｌ）および高フリーネスＮＢＫＰ（フリーネス６５０ｍｌ）の配合量が表１に記載の通りであり実施例１と異なる点以外、実施例１と同様の製造方法でクラフト紙を得た。参考例１、実施例３〜５のクラフト紙の坪量、紙厚および水分含有率は実施例１のクラフト紙と同じになるように製造した。
( Reference Example 1, Examples 3 to 5)
Kraft paper was obtained by the same production method as in Example 1, except that the blending amounts of low freeness NBKP (freeness 350 ml) and high freeness NBKP (freeness 650 ml) were as shown in Table 1 and different from Example 1. The basis weight, paper thickness, and moisture content of the kraft paper of Reference Example 1 and Examples 3 to 5 were manufactured to be the same as those of the kraft paper of Example 1.
（比較例１）
原料パルプが、低フリーネスＮＢＫＰ（フリーネス３５０ｍｌ）のみからなり、高フリーネスＮＢＫＰを配合していない点以外、実施例１と同様の製造方法でクラフト紙を得た。比較例１のクラフト紙の坪量、紙厚および水分含有率は実施例１のクラフト紙と同じになるように製造した。
(Comparative Example 1)
Kraft paper was obtained by the same production method as in Example 1 except that the raw pulp consisted of only low freeness NBKP (freeness 350 ml) and no high freeness NBKP was blended. The kraft paper of Comparative Example 1 was produced so that the basis weight, paper thickness, and moisture content were the same as those of the kraft paper of Example 1.
（比較例２）
原料パルプが、ＮＢＫＰ（フリーネス３５０ｍｌ）９０質量％と、フリーネス４５０ｍｌの麻２０質量％とからなる点以外、実施例１と同様の製造方法でクラフト紙を得た。比較例２のクラフト紙の坪量、紙厚および水分含有率は実施例１のクラフト紙と同じになるように製造した。
(Comparative Example 2)
Kraft paper was obtained by the same production method as in Example 1 except that the raw material pulp was composed of 90% by mass of NBKP (freeness 350 ml) and 20% by mass of hemp of 450 ml of freeness. The kraft paper of Comparative Example 2 was produced so that the basis weight, paper thickness, and moisture content were the same as those of the kraft paper of Example 1.
（比較例３）
原料パルプが、ＮＢＫＰ（フリーネス３５０ｍｌ）７０質量％と、フリーネス４５０ｍｌの麻３０質量％とからなる点以外、実施例１と同様の製造方法でクラフト紙を得た。比較例３のクラフト紙の坪量、紙厚および水分含有率は実施例１のクラフト紙と同じになるように製造した。
(Comparative Example 3)
Kraft paper was obtained by the same production method as in Example 1 except that the raw material pulp was composed of 70% by mass of NBKP (freeness 350 ml) and 30% by mass of hemp 450 ml of freeness. The kraft paper of Comparative Example 3 was produced so that the basis weight, paper thickness and moisture content were the same as those of the kraft paper of Example 1.
（比較例４）
原料パルプが、実施例１とは異なりＬＢＫＰ（フリーネス６５０ｍｌ）のみからなる。そして、実施例１と同様の製造方法でクラフト紙を得た。比較例４のクラフト紙の坪量、紙厚および水分含有率は実施例１のクラフト紙と同じになるように製造した。
(Comparative Example 4)
Unlike Example 1, raw material pulp consists only of LBKP (freeness 650 ml). And the kraft paper was obtained with the manufacturing method similar to Example 1. FIG. The kraft paper of Comparative Example 4 was produced so that the basis weight, paper thickness, and moisture content were the same as those of the kraft paper of Example 1.
（実施例６）
原料パルプが、低フリーネスＮＢＫＰ（フリーネス３５０ｍｌ）８０質量％と、高フリーネスＮＢＫＰ（フリーネス６５０ｍｌ）１０質量％と、さらにフリーネス４５０ｍｌの麻１０質量％とからなる点以外、実施例１と同様の製造方法でクラフト紙を得た。実施例６のクラフト紙の坪量、紙厚および水分含有率は実施例１のクラフト紙と同じになるように製造した。
(Example 6)
Production method similar to Example 1 except that the raw pulp is composed of 80% by mass of low freeness NBKP (freeness 350 ml), 10% by mass of high freeness NBKP (freeness 650 ml), and further 10% by mass of hemp of 450 ml of freeness. I got kraft paper. The kraft paper of Example 6 was produced so that the basis weight, paper thickness, and moisture content were the same as those of the kraft paper of Example 1.
（参考例２〜５、実施例９〜１０）
原料パルプに含まれる低フリーネスＮＢＫＰのフリーネスが、表１に記載の通りであり、実施例１と異なる点以外、実施例１と同様の製造方法でクラフト紙を得た。参考例２〜５、実施例９〜１０のクラフト紙の坪量、紙厚および水分含有率は実施例１のクラフト紙と同じになるように製造した。
( Reference Examples 2-5, Examples 9-10 )
The freeness of the low freeness NBKP contained in the raw material pulp is as shown in Table 1, and kraft paper was obtained by the same production method as in Example 1 except that it was different from Example 1. The craft papers of Reference Examples 2 to 5 and Examples 9 to 10 were produced so that the basis weight, paper thickness, and moisture content were the same as those of the kraft paper of Example 1.
（参考例６〜９、実施例１５〜１６）
原料パルプに含まれる高フリーネスＮＢＫＰのフリーネスが、表１に記載の通りであり、実施例１と異なる点以外、実施例１と同様の製造方法でクラフト紙を得た。参考例６〜９、実施例１５〜１６のクラフト紙の坪量、紙厚および水分含有率は実施例１のクラフト紙と同じになるように製造した。
( Reference Examples 6-9, Examples 15-16 )
The freeness of the high freeness NBKP contained in the raw material pulp is as shown in Table 1, and kraft paper was obtained by the same production method as in Example 1 except that it was different from Example 1. The basis weight, paper thickness, and moisture content of the kraft papers of Reference Examples 6 to 9 and Examples 15 to 16 were manufactured to be the same as those of the kraft paper of Example 1.
（実施例１９〜２２、比較例５、比較例６）
クラフト紙の坪量および紙厚を実施例１とは異なる表１に記載の値とした点以外、実施例１と同様の製造方法でクラフト紙を得た。実施例１９〜２２、比較例５、比較例６のクラフト紙の水分含有率は実施例１のクラフト紙と同じになるように製造した。
(Examples 19 to 22, Comparative Example 5, Comparative Example 6)
Kraft paper was obtained by the same production method as in Example 1, except that the basis weight and thickness of the kraft paper were set to the values shown in Table 1 different from those in Example 1. The craft papers of Examples 19 to 22, Comparative Example 5 and Comparative Example 6 were produced so that the moisture content was the same as that of the kraft paper of Example 1.
（実施例２３〜２８）
乾燥工程において、ドライヤーの圧力、ドライヤー表面の温度を調整することにより、クラフト紙の水分含有率を実施例１とは異なる表１に記載の値とした点以外、実施例１と同様の製造方法でクラフト紙を得た。実施例２３〜２８のクラフト紙の坪量および紙厚は、実施例１のクラフト紙と同じになるように製造した。
(Examples 23 to 28)
In the drying step, the same manufacturing method as in Example 1 except that the moisture content of the kraft paper is adjusted to the values shown in Table 1 different from Example 1 by adjusting the pressure of the dryer and the temperature of the dryer surface. I got kraft paper. The basis weight and thickness of the kraft paper of Examples 23 to 28 were manufactured to be the same as those of the kraft paper of Example 1.
（評価）
各実施例および各比較例のクラフト紙について、引張強度、伸び率、スリッター加工適正について評価した。
１．水分含有率
ＪＩＳ Ｐ８１２７に準拠して測定した。
２．引張強度
JIS C ２１１１：２００２に準拠して縦方向の引張強度を測定した。
３．伸び率
JIS C ２１１１：２００２に準拠して縦方向の伸び率を測定した。
４．紙切れ
スリッター加工時及の紙切れの発生を以下のように評価した。
○：紙切れは発生しなかった。
△：紙切れが若干発生した。
×：紙切れが頻繁に発生する。
(Evaluation)
The kraft paper of each example and each comparative example was evaluated for tensile strength, elongation, and slitting process suitability.
1. Water content Measured according to JIS P8127.
2. Tensile strength
The tensile strength in the longitudinal direction was measured according to JIS C 2111: 2002.
3. Growth rate
The elongation in the longitudinal direction was measured in accordance with JIS C 2111: 2002.
4). Out of Paper The occurrence of out of paper during slitting was evaluated as follows.
○: No piece of paper occurred.
Δ: Some paper breakage occurred.
X: Paper breakage frequently occurs.
本発明のクラフト紙は、薄く、しかも優れた引張強度および伸び率を有するので、種々の用途に有用である。例えば、電気機器内に組み込まれる絶縁紙として適している。特に、複数の電線を束ね、コード内において緩衝材として機能する電線巻紙として有用である。 Since the kraft paper of the present invention is thin and has excellent tensile strength and elongation, it is useful for various applications. For example, it is suitable as an insulating paper incorporated in an electric device. In particular, it is useful as an electric wire wrapping that bundles a plurality of electric wires and functions as a cushioning material in the cord.
Claims (3)
前記原料パルプは、ＪＩＳ Ｐ８１２１に準拠したカナダ標準フリーネスが３４０〜３６０ｍｌの第１の針葉樹クラフトパルプと、ＪＩＳ Ｐ８１２１に準拠したカナダ標準フリーネスが６４０〜６６０ｍｌの第２の針葉樹クラフトパルプと、を含み、
前記原料パルプ中に、針葉樹クラフトパルプが８０〜１００重量％であり、第１の針葉樹クラフトパルプが５０〜９０質量％含まれ、第２の針葉樹クラフトパルプが１０〜５０質量％含まれ、
ＪＩＳ Ｃ２１１１：２００２に準拠した坪量が１５〜３５ｇ／ｍ２、ＪＩＳ Ｃ２１１１：２００２に準拠した縦方向の伸びが１．８〜３．６％、ＪＩＳ Ｃ２１１１：２００２に準拠した縦方向の引張強度が１．６０〜４．５０ｋＮ／ｍである、電線巻紙用クラフト紙。 A kraft paper for electric wire wrapping made of raw pulp including softwood kraft pulp having at least two different kinds of freeness ,
The raw pulp includes a first softwood kraft pulp having a Canadian standard freeness of 340 to 360 ml in accordance with JIS P8121, and a second softwood kraft pulp having a Canadian standard freeness of 640 to 660 ml in accordance with JIS P8121,
In the raw material pulp, the softwood kraft pulp is 80 to 100% by weight, the first softwood kraft pulp is 50 to 90% by weight, the second softwood kraft pulp is 10 to 50% by weight,
The basis weight according to JIS C2111: 2002 is 15 to 35 g / m 2 , the longitudinal elongation according to JIS C2111: 2002 is 1.8 to 3.6%, and the tensile strength in the longitudinal direction according to JIS C2111: 2002 Is a kraft paper for electric wire wrapping .
Priority Applications (1)
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| CN102251429B (en) * | 2011-07-27 | 2013-03-20 | 岳阳林纸股份有限公司 | Colored kraft paper and production method thereof |
| JP5952594B2 (en) * | 2012-03-05 | 2016-07-13 | 大王製紙株式会社 | Kraft paper |
| DE102012103775A1 (en) * | 2012-04-27 | 2013-10-31 | PaCon Ltd. & Co.KG | Insulating Paper |
| CN107338670B (en) * | 2016-12-30 | 2019-11-12 | 齐鲁工业大学 | A kind of method that the wealthy mixing sodium hydroxide anthraquinone total chlorine free bleaching chemical pulp of needle prepares paper base material |
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| JPS58123604A (en) * | 1982-01-19 | 1983-07-22 | 株式会社 巴川製紙所 | Electrically insulating laminated paper |
| JP2886233B2 (en) * | 1990-01-26 | 1999-04-26 | ニッポン高度紙工業株式会社 | Electrolytic capacitor |
| JP3824724B2 (en) * | 1997-01-16 | 2006-09-20 | 株式会社フジクラ | Plastic laminated paper for oil immersion insulation and power cable using the same |
| JP4167348B2 (en) * | 1999-04-23 | 2008-10-15 | 大王製紙株式会社 | Dustless paper |
| JP2002069891A (en) * | 2000-08-31 | 2002-03-08 | Kazariichi:Kk | Glass-coated paper |
| JP2005299283A (en) * | 2004-04-14 | 2005-10-27 | Tomoegawa Paper Co Ltd | Net for construction work |
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