JP2006063481A - Newsprint - Google Patents
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Description
本発明は、新聞用紙に関するものである。 The present invention relates to newsprint.
新聞用紙は新聞配達時の配達人への重量負担を軽減するために、あるいは物流コストを削減するために、新聞用紙の軽量化、低坪量化が求められている。しかし、用紙の低坪量化は光学特性の悪化、特に印刷の裏抜けを生じやすくする傾向があるため、新聞用紙には不透明度を向上させる種々の工夫が施されている。
一方、古紙パルプは、森林資源への保護または製造の省エネルギー化に有効であり、製造コストの低いことから、新聞用紙に増配したいという要望が強い。しかし、古紙パルプの増配は用紙の不透明度を下げる傾向があり、前記低坪量化に由来する不透明度の向上への要求と相反する結果を招くおそれがある。
Newspaper paper is required to be lighter and have a lower basis weight in order to reduce the weight burden on the delivery person at the time of newspaper delivery or to reduce the distribution cost. However, since lowering the basis weight of paper tends to cause deterioration of optical characteristics, particularly easy printing back-through, various measures for improving opacity are applied to newsprint paper.
On the other hand, waste paper pulp is effective in protecting forest resources or saving energy in production, and has a low demand for production. However, an increase in the amount of used paper pulp tends to lower the opacity of the paper, which may result in a conflict with the demand for increased opacity resulting from the low basis weight.
そこで、古紙パルプに不透明度の向上効果がある機械パルプを配合することも考えられる。しかし、機械パルプの配合は強度の低下を招く可能性があり、高速オフセット印刷時の高張力に耐えられる強度が望まれる新聞用紙においては、機械パルプを配合すると共に強度を向上できる技術は不可欠である。
例えば、特許文献１に示すように、脱墨古紙パルプを分級選別してその長繊維分を機械パルプに配合した新聞用紙が知られている。この新聞用紙では表面に水和ケイ酸と接着剤とを表面に塗工し、不透明度を向上させている。
For example, as shown in Patent Document 1, newsprint paper is known in which deinked waste paper pulp is classified and classified and its long fiber content is blended with mechanical pulp. In this newsprint, the surface is coated with hydrated silicic acid and an adhesive to improve opacity.
前記特許文献１では、脱墨古紙パルプの長繊維分の働きにより新聞用紙の引裂強度を上げることができるが、短繊維分が少なくなるため引張強度および不透明度は逆に低くなる傾向があり、強度および不透明度が十分とは言えなかった。
また、機械パルプの配合のみでは不透明度が十分であるとは言えず、表面塗工を行って不透明度を補う必要があり、製造コストを高騰させる原因となっていた。
本発明は、前記の問題を解決できる新聞用紙を提供することを目的とする。
本発明は、叩解により繊維長０．５〜１．５ｍｍの比率が高められた機械パルプを脱墨古紙パルプに配合し、このパルプ原料に対して機械パルプの総量が１０〜７０重量％でかつその総機械パルプの中に繊維長０．５〜１．５ｍｍの機械パルプを３０〜７０重量％含有させることにより、不透明度と引裂強度と引張強度とを全て満足させることのできる新聞用紙を提供することを目的とする。
In Patent Document 1, the tear strength of newsprint paper can be increased by the action of the long fibers of the deinked waste paper pulp, but the tensile strength and opacity tend to be low because the short fibers are reduced, The strength and opacity were not sufficient.
Moreover, it cannot be said that the opacity is sufficient only by blending the mechanical pulp, and it is necessary to compensate for the opacity by performing surface coating, which has caused the production cost to increase.
An object of this invention is to provide the newsprint which can solve the said problem.
In the present invention, mechanical pulp having a fiber length ratio of 0.5 to 1.5 mm increased by beating is blended with deinked waste paper pulp, and the total amount of mechanical pulp is 10 to 70% by weight with respect to this pulp raw material. By providing 30 to 70% by weight of mechanical pulp having a fiber length of 0.5 to 1.5 mm in the total mechanical pulp, a newsprint that can satisfy all of opacity, tear strength, and tensile strength is provided. The purpose is to do.
前記目的を達成するため、本発明は新聞用紙に、次の手段を講じた。
即ち、脱墨古紙パルプと機械パルプとをパルプ原料とし、このパルプ原料に含まれる機械パルプの総量を１０〜７０重量％にした新聞用紙であって、
前記総機械パルプの中に繊維長０．５〜１．５ｍｍの機械パルプを３０〜７０重量％含有する。
これによって、パルプの繊維長を引張強度と引裂強度とを双方高くすることができる０．５〜１．５ｍｍに規定し、このパルプを適量添加することにより、新聞用紙の引裂強度と引張強度とが高くすることが可能となる。また、前記パルプを不透明度の向上効果を有する機械パルプとすることで、新聞用紙の不透明度を高めることができる。これらによって、新聞用紙において不透明度と引張強度と引裂強度とを全て満足させることができる。
In order to achieve the above object, the present invention takes the following measures on newsprint.
That is, newsprint paper in which deinked waste paper pulp and mechanical pulp are used as pulp raw materials, and the total amount of mechanical pulp contained in the pulp raw materials is 10 to 70% by weight,
The total mechanical pulp contains 30 to 70% by weight of mechanical pulp having a fiber length of 0.5 to 1.5 mm.
Accordingly, the fiber length of the pulp is defined as 0.5 to 1.5 mm which can increase both the tensile strength and the tear strength, and by adding an appropriate amount of this pulp, the tear strength and tensile strength of the newsprint are determined. Can be increased. Moreover, the opacity of newsprint can be increased by using the pulp as a mechanical pulp having an effect of improving opacity. As a result, the opacity, tensile strength, and tear strength of the newsprint can all be satisfied.
坪量が３８〜５０ｇ／ｍ2に抄紙されていて、かつ不透明度８８％以上、引張強度２．２ｋＮ／ｍ以上または引裂強度３３０ｍＮ以上の内の少なくともひとつを満足する。
これによって、新聞用紙を低坪量に抄紙しても、印刷の裏抜けが発生したり、高速オフセット印刷時に断紙が生じるのを防止することができる。
The paper has a basis weight of 38 to 50 g / m 2 and satisfies at least one of opacity of 88% or more, tensile strength of 2.2 kN / m or more, or tear strength of 330 mN or more.
Accordingly, even if newspaper paper is made with a low basis weight, it is possible to prevent the occurrence of print back-through and the occurrence of paper breakage during high-speed offset printing.
本発明により、新聞用紙において、不透明度と引裂強度と引張強度との全てを満足させることができる。 The present invention can satisfy all of opacity, tear strength, and tensile strength in newsprint.
本発明の新聞用紙に用いられるパルプ原料は、脱墨古紙パルプと機械パルプとを有する主成分から成っている。
前記脱墨パルプの原料には、例えば上白、罫白、カード、特白、中白、ケント、白アート、新聞、雑誌などが挙げられ、これらのパルプの少なくとも１種以上を用いることができる。上白、罫白、カード、特白、中白またはケント紙などの古紙は化学パルプが主体で形成されており機械パルプは含まれていない。また、新聞または雑誌などの古紙では機械パルプは１５〜６０重量％含まれている。従って、前記脱墨古紙パルプ中に含まれる再生機械パルプを有効に利用し、再生パルプより高価な機械パルプの使用率を下げて製造コストを低くするには、少なくとも新聞または雑誌を原料とする脱墨古紙パルプを使用するのが好ましい。
The pulp raw material used for the newsprint of the present invention consists of a main component having deinked waste paper pulp and mechanical pulp.
Examples of the raw material for the deinked pulp include upper white, ruled white, card, extra white, medium white, Kent, white art, newspaper, magazine, and the like, and at least one of these pulps can be used. . Old paper such as upper white, ruled white, card, special white, medium white, or Kent paper is mainly composed of chemical pulp and does not contain mechanical pulp. Further, used paper such as newspapers or magazines contains 15 to 60% by weight of mechanical pulp. Therefore, in order to effectively use the recycled mechanical pulp contained in the deinked waste paper pulp and reduce the use rate of the mechanical pulp that is more expensive than the recycled pulp to reduce the production cost, at least the newspaper or magazine is used as the raw material. Ink waste paper pulp is preferably used.
前記機械パルプの中でサーモメカニカルパルプ（ＴＭＰ）は化学パルプより不透明度に優れ、同じ機械パルプである砕木パルプ（ＧＰ）などに比べて高強度である。従って、脱墨古紙パルプに配合するパルプ材としては最も好適に用いられる。また、前記サーモメカニカルパルプの木材原料は、スプルース系、パイン系またはユーカリ系などであり、針葉樹および広葉樹などを問わず用いることができる。
前記サーモメカニカルパルプは、原料チップを洗浄、予熱、加圧リファイナー、大気圧リファイナーの順に叩解（リファイニング）されてパルプ化される。この叩解後の平均繊維長はカヤニ重量平均繊維長（以下、平均繊維長と呼ぶ。）で１．６〜１．８ｍｍであり、繊維長が１．６ｍｍより長い繊維分が含まれている。この長繊維分を脱墨古紙パルプに添加すると引張強度を低下させ、また十分な不透明度を得られない可能性があるため、さらに叩解を進めて繊維長が０．５〜１．５ｍｍの比率を高くするように調整する。
Among the mechanical pulps, thermomechanical pulp (TMP) has better opacity than chemical pulp, and has higher strength than ground pulp (GP), which is the same mechanical pulp. Therefore, it is most suitably used as a pulp material to be blended with deinked waste paper pulp. Moreover, the wood raw material of the said thermomechanical pulp is a spruce type | system | group, a pine type | system | group, or a eucalyptus type | system | group, and can be used regardless of a conifer, a hardwood, etc.
The thermomechanical pulp is pulped by refining the raw material chips in the order of washing, preheating, pressure refiner, and atmospheric refiner. The average fiber length after this beating is 1.6 to 1.8 mm in terms of the weight average fiber length (hereinafter referred to as the average fiber length), and the fiber length is longer than 1.6 mm. If this long fiber content is added to deinked waste paper pulp, the tensile strength may be reduced and sufficient opacity may not be obtained. Adjust so that is higher.
前記パルプ原料には機械パルプ以外に、脱墨古紙パルプ由来の再生機械パルプも含まれており、新たに配合する機械パルプの添加量は原料の再生機械パルプの含有量に応じて変更する必要がある。従って、新たに配合する機械パルプの添加量を規定することは困難であるが、再生機械パルプを含む機械パルプの総量と、この機械パルプの総量に対する有効な繊維長を有する機械パルプの含有量は規定することができる。
即ち、機械パルプの総量がパルプ原料の１０〜７０重量％、好ましくは２０〜６０重量％になるように、機械パルプと脱墨古紙パルプとを配合する。総機械パルプ量を１０重量％、好ましくは２０重量％より多くすることで、機械パルプの不透明度向上効果や強度向上効果を十分に発揮させることが可能となる。また、総機械パルプ量を７０重量％未満、好ましくは６０重量％未満とすることで、環境負荷が小さく原料コストに優れる脱墨古紙パルプを多く用いることができる。
In addition to mechanical pulp, the pulp raw material also includes recycled mechanical pulp derived from deinked waste paper pulp, and the amount of newly added mechanical pulp must be changed according to the content of recycled mechanical pulp as the raw material. is there. Therefore, it is difficult to define the amount of newly added mechanical pulp, but the total amount of mechanical pulp including recycled mechanical pulp and the content of mechanical pulp having an effective fiber length relative to the total amount of mechanical pulp are Can be prescribed.
That is, mechanical pulp and deinked waste paper pulp are blended so that the total amount of mechanical pulp is 10 to 70% by weight, preferably 20 to 60% by weight of the pulp raw material. By making the total amount of mechanical pulp more than 10% by weight, preferably more than 20% by weight, it becomes possible to sufficiently exhibit the opacity improvement effect and strength improvement effect of mechanical pulp. Further, when the total amount of mechanical pulp is less than 70% by weight, preferably less than 60% by weight, it is possible to use a large amount of deinked waste paper pulp having a low environmental load and excellent raw material cost.
また、前記機械パルプには引裂強度と引張強度の双方に優れる機械パルプが含まれており、これらの機械パルプは繊維長０．５〜１．５ｍｍの比率が高い。これらの有効な繊維長を有する機械パルプが総機械パルプ中に３０〜７０重量％、好ましくは４０〜６０重量％になるように、機械パルプと脱墨古紙パルプとを配合するのが好ましい。この繊維長０．５〜１．５ｍｍの機械パルプを総機械パルプ中に３０重量％、好ましくは４０重量％より多く配合することで、引張強度を高くすることが可能となる。また、繊維長０．５〜１．５ｍｍの機械パルプを総機械パルプ中に７０重量％、好ましくは６０重量％より少なくすることで、引裂強度を高くすることが可能となる。 Moreover, the mechanical pulp contains mechanical pulp excellent in both tear strength and tensile strength, and these mechanical pulps have a high fiber length ratio of 0.5 to 1.5 mm. It is preferable to blend the mechanical pulp and the deinked waste paper pulp so that the mechanical pulp having these effective fiber lengths is 30 to 70% by weight, preferably 40 to 60% by weight, in the total mechanical pulp. By blending the mechanical pulp having a fiber length of 0.5 to 1.5 mm into the total mechanical pulp in an amount of 30% by weight, preferably more than 40% by weight, the tensile strength can be increased. Moreover, it is possible to increase the tear strength by reducing the mechanical pulp having a fiber length of 0.5 to 1.5 mm to 70% by weight, preferably 60% by weight, in the total mechanical pulp.
本発明の新聞用紙の製造方法は、機械パルプを叩解し繊維長０．５〜１．５ｍｍの比率を高める第１工程と、前記機械パルプと脱墨古紙パルプとを混合して、機械パルプの総量が１０〜７０重量％でかつその総機械パルプの中に繊維長０．５〜１．５ｍｍの機械パルプが３０〜７０重量％含有されるパルプスラリーを調成する第２工程とを有している。
前記第１工程は、木材チップを１００〜１３０℃で１〜３分間予熱した後、１次加圧リファイナーおよび２次大気圧リファイナーでフリーネスを指標として叩解し、繊維長が０．５〜１．５ｍｍの比率を高めた機械パルプを得る工程である。
The method for producing newsprint of the present invention comprises a first step of beating mechanical pulp to increase the ratio of fiber length of 0.5 to 1.5 mm, mixing the mechanical pulp and deinked waste paper pulp, A second step of preparing a pulp slurry having a total amount of 10 to 70% by weight and containing 30 to 70% by weight of mechanical pulp having a fiber length of 0.5 to 1.5 mm in the total mechanical pulp. ing.
In the first step, the wood chips are preheated at 100 to 130 ° C. for 1 to 3 minutes, and then beaten with a primary pressure refiner and a secondary atmospheric refiner using freeness as an index, and the fiber length is 0.5 to 1. This is a process for obtaining mechanical pulp having an increased ratio of 5 mm.
前記第２工程は、脱墨古紙パルプに、繊維長を調整した機械パルプを配合し、機械パルプの総量が１０〜７０重量％でかつその総機械パルプの中に繊維長０．５〜１．５ｍｍの機械パルプが３０〜７０重量％含有されるパルプスラリーを調成する工程である。
これによって、塗工工程を設けなくとも不透明度を高くすることが可能となり、塗工工程を設けないことで製造工程の簡素化が可能となり、製造コストを下げることができる。
In the second step, mechanical pulp with adjusted fiber length is blended with deinked waste paper pulp, the total amount of mechanical pulp is 10 to 70% by weight, and the total mechanical pulp has a fiber length of 0.5 to 1. This is a step of preparing a pulp slurry containing 30 to 70% by weight of 5 mm mechanical pulp.
This makes it possible to increase the opacity without providing a coating process, and to simplify the manufacturing process without providing the coating process, thereby reducing the manufacturing cost.
以下に本発明を実施例を用いてより具体的に説明するが、本発明はこれらの実施例に限定されるものではない。
本発明では、サーモメカニカルパルプをフリーネスが約１３０ｃｃとなるように叩解した後、これを脱墨古紙パルプと配合し、総機械パルプ量または０．５〜１．５ｍｍ繊維長の機械パルプの総機械パルプに対する含有率が異なる試料を得た。これらの試料を坪量４０ｇ／ｍ2に抄紙し、抄紙された紙支持体の不透明度、引張強度および引裂強度を評価した。結果を表１に示す。
Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to these examples.
In the present invention, the thermomechanical pulp is beaten so that the freeness becomes about 130 cc, and then blended with the deinked waste paper pulp, and the total mechanical pulp amount or the total mechanical pulp of 0.5 to 1.5 mm fiber length is obtained. Samples with different contents relative to the pulp were obtained. These samples were paper-made at a basis weight of 40 g / m 2, and the opacity, tensile strength and tear strength of the paper support thus produced were evaluated. The results are shown in Table 1.
なお、表１の繊維長はカヤニ社製きょう雑物試験機ＦＳ−２００により測定した繊維長とその含有率であり、坪量はＪＩＳ−Ｐ８１２４（１９９８年）で測定した結果である。 また、不透明度はＪＩＳ−Ｐ８１４９（２０００年）に従って測定し、不透明度８８％未満を×、不透明度８８％以上９０％未満を△、不透明度９０％以上を○と評価した。
引張強度はＪＩＳ−Ｐ８１１３（１９９８年）に従って測定し、引張強度が２．２ｋＮ／ｍ未満を×、２．２ｋＮ／ｍ以上かつ２．６ｋＮ／ｍ未満を△、２．６ｋＮ／ｍ以上を○と評価した。
In addition, the fiber length of Table 1 is the fiber length and its content rate which were measured with the Kayani Co., Ltd. foreign substance tester FS-200, and a basic weight is the result measured by JIS-P8124 (1998). The opacity was measured according to JIS-P8149 (2000), and the opacity of less than 88% was evaluated as x, the opacity of 88% or more and less than 90% was evaluated as Δ, and the opacity of 90% or more was evaluated as ◯.
The tensile strength is measured in accordance with JIS-P8113 (1998). The tensile strength is less than 2.2 kN / m, x is 2.2 kN / m or more and less than 2.6 kN / m, Δ is 2.6 kN / m or more. It was evaluated.
引裂強度はＪＩＳ−Ｐ８１１６（２０００年）に従って測定し、引裂強度が３３０ｍＮ未満を×、３３０ｍＮ以上かつ３９０ｍＮ未満を△、３９０ｍＮ以上を○と評価した。
さらに、総合評価は不透明度、引張強度および引裂強度の３評価を総合的に満足させるか否かを示し、全ての評価が○の場合を◎の総合評価で、いずれかの評価が○もしくは△であるものに○の総合評価を、いずれかの評価に×があるものに×の総合評価を下した。
The tear strength was measured according to JIS-P8116 (2000), and the tear strength was evaluated as x when less than 330 mN, Δ when 330 mN or more and less than 390 mN, and ○ when 390 mN or more.
Furthermore, the comprehensive evaluation indicates whether or not the three evaluations of opacity, tensile strength, and tear strength are comprehensively satisfied. When all the evaluations are ○, the overall evaluation is ◎, and any evaluation is ○ or △ An overall evaluation of ○ was given to those with x, and an overall evaluation of x was given to any of those having x.
総機械パルプ含有量が５重量％である比較例１に比べて、総機械パルプ含有量が１０重量％の実施例１は、不透明度の評価が高く、総機械パルプ含有量は１０重量％より多くする必要があることが分かる。 Compared with Comparative Example 1 in which the total mechanical pulp content is 5% by weight, Example 1 in which the total mechanical pulp content is 10% by weight has a high opacity evaluation, and the total mechanical pulp content is more than 10% by weight. It turns out that we need to do more.
総機械パルプ含有量が１０重量％である実施例１に比べると、実施例２は不透明度の評価が高く、総機械パルプ含有量は好ましくは２０重量％より多くした方が好ましいことが分かる。 Compared to Example 1 where the total mechanical pulp content is 10% by weight, Example 2 has a higher evaluation of opacity, and it can be seen that the total mechanical pulp content is preferably more than 20% by weight.
総機械パルプ含有量が４０重量％になるように、サーモメカニカルパルプを配合し、総機械パルプに占める繊維長０．５〜１．５ｍｍの機械パルプの配合量が４０重量％の実施例３の試料を得た。不透明度、引張強度および引裂強度の全てが○の評価となり、実施例および比較例の中で総合評価が最も優れる評価となっている。 The thermomechanical pulp is blended so that the total mechanical pulp content is 40% by weight, and the blending amount of the mechanical pulp having a fiber length of 0.5 to 1.5 mm in the total mechanical pulp is 40% by weight. A sample was obtained. Opacity, tensile strength, and tear strength are all evaluated as ◯, and the overall evaluation is the most excellent evaluation among the examples and comparative examples.
総機械パルプ含有量が７０重量％である実施例５に比べて、総機械パルプ含有量が６０重量％の実施例４は、引張強度が良好である。しかし、実施例５は比較例２に比べれば十分に良好な引張強度と引裂強度を有しているため、総機械パルプ含有量は好ましくは６０重量％より低くした方が良いことが分かる。 Compared to Example 5 in which the total mechanical pulp content is 70% by weight, Example 4 in which the total mechanical pulp content is 60% by weight has good tensile strength. However, since Example 5 has sufficiently good tensile strength and tear strength compared to Comparative Example 2, it can be seen that the total mechanical pulp content is preferably lower than 60% by weight.
総機械パルプ含有量が７０重量％である本実施例５は、総機械パルプ含有量が８０重量％の比較例２に比べて、引張強度および引裂強度が良好であり、総機械パルプ含有量は７０重量％より少ない方が良いことが分かる。 The present Example 5 in which the total mechanical pulp content is 70% by weight has better tensile strength and tear strength than the Comparative Example 2 in which the total mechanical pulp content is 80% by weight, and the total mechanical pulp content is It can be seen that less than 70% by weight is better.
実施例６は、原料パルプの４０重量％を占める総機械パルプの中で、３０重量％が繊維長０．５〜１．５ｍｍの機械パルプで構成されている。実施例３に比べて繊維長０．５〜１．５ｍｍの機械パルプの含有量が低い（繊維長１．６ｍｍ以上が多い）ため、引張強度は低い評価となっているが、繊維長０．５〜１．５ｍｍの機械パルプの含有量が２０重量％の比較例３よりは良好な評価となっている。このことから、繊維長０．５〜１．５ｍｍの機械パルプは少なくとも３０重量％含まれているのが好ましいことが分かる。 In Example 6, among the total mechanical pulp occupying 40% by weight of the raw pulp, 30% by weight is composed of mechanical pulp having a fiber length of 0.5 to 1.5 mm. Since the content of mechanical pulp having a fiber length of 0.5 to 1.5 mm is lower than that of Example 3 (the fiber length is 1.6 mm or more), the tensile strength is evaluated to be low, but the fiber length is 0.00. The content of the 5-1.5 mm mechanical pulp is better than that of Comparative Example 3 in which the content is 20% by weight. From this, it is understood that it is preferable that at least 30% by weight of mechanical pulp having a fiber length of 0.5 to 1.5 mm is contained.
繊維長０．５〜１．５ｍｍの機械パルプの含有量が７０重量％である実施例８に比べて、繊維長０．５〜１．５ｍｍの機械パルプの含有量が６０重量％である本実施例７は、引張強度の評価が良好であり、繊維長０．５〜１．５ｍｍの機械パルプはより好ましくは４０〜６０重量％含まれているのが良いことが分かる。 Compared with Example 8 in which the content of mechanical pulp having a fiber length of 0.5 to 1.5 mm is 70% by weight, the content of mechanical pulp having a fiber length of 0.5 to 1.5 mm is 60% by weight. Example 7 has good evaluation of tensile strength, and it can be seen that mechanical pulp having a fiber length of 0.5 to 1.5 mm is more preferably contained in an amount of 40 to 60% by weight.
実施例８は、原料パルプの４０重量％を占める総機械パルプの中で、７０重量％が繊維長０．５〜１．５ｍｍの機械パルプで構成されている。実施例３および実施例７に比べて繊維長０．５〜１．５ｍｍの機械パルプの含有量は高い（繊維長１．６ｍｍ以上が少ない）ため、引裂強度の評価が実施例３および実施例７より良くない。しかし、繊維長０．５〜１．５ｍｍの機械パルプの含有量が８０重量％と高い比較例４よりは良好な評価となっている。
［比較例１］
比較例１は、原料パルプに占める総機械パルプの含有量が５重量％と実施例１より低く、不透明度の向上効果を有する機械パルプの含有量が低いため、総合評価は良くない。
［比較例２］
比較例２は、原料パルプに占める総機械パルプの含有量が８０重量％と実施例２より高く、強度向上効果を有する脱墨古紙パルプの含有量が低いため、総合評価は良くない。
［比較例３］
比較例３は、繊維長０．５〜１．５ｍｍの機械パルプの含有量が２０重量％と実施例４より低く、引裂強度の評価が良くない。
［比較例４］
比較例４は、繊維長０．５〜１．５ｍｍの機械パルプの含有量が８０重量％と実施例５より高く、引張強度の評価が良くない。
［総合評価］
実施例１〜５および比較例１〜４の結果から、不透明度、引張強度および引裂強度の全てを満足できるのは、原料パルプの１０〜７０重量％、より好ましくは２０〜６０重量％が機械パルプであって、かつ繊維長０．５〜１．５ｍｍの機械パルプを３０〜７０重量％、より好ましくは４０〜６０重量％含む実施例２〜４および実施例７であることが分かる。
In Example 8, 70% by weight of the total mechanical pulp occupying 40% by weight of the raw pulp is composed of mechanical pulp having a fiber length of 0.5 to 1.5 mm. Since the content of mechanical pulp having a fiber length of 0.5 to 1.5 mm is higher than that of Example 3 and Example 7 (the fiber length is less than 1.6 mm), the evaluation of tear strength is Example 3 and Example. Not better than 7. However, the evaluation is better than Comparative Example 4 in which the content of mechanical pulp having a fiber length of 0.5 to 1.5 mm is as high as 80% by weight.
[Comparative Example 1]
In Comparative Example 1, the content of the total mechanical pulp in the raw material pulp is 5% by weight, which is lower than that of Example 1, and the content of the mechanical pulp having the effect of improving opacity is low, so the overall evaluation is not good.
[Comparative Example 2]
In Comparative Example 2, the content of the total mechanical pulp in the raw material pulp is 80% by weight, which is higher than that of Example 2, and the content of the deinked waste paper pulp having the effect of improving the strength is low.
[Comparative Example 3]
In Comparative Example 3, the content of mechanical pulp having a fiber length of 0.5 to 1.5 mm is 20% by weight, which is lower than Example 4, and the evaluation of tear strength is not good.
[Comparative Example 4]
In Comparative Example 4, the content of mechanical pulp having a fiber length of 0.5 to 1.5 mm is 80% by weight, which is higher than Example 5, and the evaluation of tensile strength is not good.
[Comprehensive evaluation]
From the results of Examples 1 to 5 and Comparative Examples 1 to 4, opacity, tensile strength, and tear strength can all be satisfied from 10 to 70% by weight of raw pulp, more preferably from 20 to 60% by weight. It turns out that it is Examples 2-4 and Example 7 which are 30-70 weight% of mechanical pulp which is a pulp and whose fiber length is 0.5-1.5 mm, More preferably, it contains 40-60 weight%.
Claims (2)
前記総機械パルプの繊維長が０．５〜１．５ｍｍの比率が３０〜７０重量％であることを特徴とする新聞用紙。 Newsprint paper in which deinked waste paper pulp and mechanical pulp are used as pulp raw materials, and the total amount of mechanical pulp contained in the pulp raw materials is 10 to 70% by weight,
The newsprint, wherein the total mechanical pulp has a fiber length of 0.5 to 1.5 mm and a ratio of 30 to 70% by weight.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010285723A (en) * | 2009-06-12 | 2010-12-24 | Marusumi Paper Co Ltd | Offset printing paper, and method for producing the same |
| JP2011214169A (en) * | 2010-03-31 | 2011-10-27 | Daio Paper Corp | Newsprint paper and method for producing newsprint paper |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002180394A (en) * | 2000-12-12 | 2002-06-26 | Daio Paper Corp | Newsprint paper sheet for offset |
| JP2002201592A (en) * | 2000-12-28 | 2002-07-19 | Oji Paper Co Ltd | Neutral newsprint paper for offset printing |
| JP2002201590A (en) * | 2000-12-28 | 2002-07-19 | Daio Paper Corp | Paper for newspaper and method for producing the same |
| JP2004225201A (en) * | 2003-01-23 | 2004-08-12 | Nippon Paper Industries Co Ltd | Chemithermo mechanical pulp and method for producing the pulp and application thereof |
| JP2005097800A (en) * | 2003-09-26 | 2005-04-14 | Daio Paper Corp | Newsprint for offset printing |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002180394A (en) * | 2000-12-12 | 2002-06-26 | Daio Paper Corp | Newsprint paper sheet for offset |
| JP2002201592A (en) * | 2000-12-28 | 2002-07-19 | Oji Paper Co Ltd | Neutral newsprint paper for offset printing |
| JP2002201590A (en) * | 2000-12-28 | 2002-07-19 | Daio Paper Corp | Paper for newspaper and method for producing the same |
| JP2004225201A (en) * | 2003-01-23 | 2004-08-12 | Nippon Paper Industries Co Ltd | Chemithermo mechanical pulp and method for producing the pulp and application thereof |
| JP2005097800A (en) * | 2003-09-26 | 2005-04-14 | Daio Paper Corp | Newsprint for offset printing |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010285723A (en) * | 2009-06-12 | 2010-12-24 | Marusumi Paper Co Ltd | Offset printing paper, and method for producing the same |
| JP2011214169A (en) * | 2010-03-31 | 2011-10-27 | Daio Paper Corp | Newsprint paper and method for producing newsprint paper |
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