JP2006063501A - Paper for newspaper - Google Patents
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- JP2006063501A JP2006063501A JP2004250737A JP2004250737A JP2006063501A JP 2006063501 A JP2006063501 A JP 2006063501A JP 2004250737 A JP2004250737 A JP 2004250737A JP 2004250737 A JP2004250737 A JP 2004250737A JP 2006063501 A JP2006063501 A JP 2006063501A
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本発明は、高白度で裏抜けを少なくした新聞用紙に関するものである。 The present invention relates to newsprint with high whiteness and reduced showthrough.
近年、新聞用紙の印刷のカラー化が行われるようになってきており、それに伴って新聞用紙にはカラー画像などが鮮明に印刷できる高い白色度が求められるようになってきている。
しかし、新聞用紙の白色化は不透明度の低下を招きやすく、低坪量化を必要とされる新聞用紙あっては、不透明度を低下させずに白色度を上げる必要がある。
そこで、これらの問題を解決するため、特許文献１ではタルク、クレーまたはカオリンにホワイトカーボンを併用して新聞用紙を製造する技術が開示されている。この新聞用紙に用いられるホワイトカーボンは、珪酸ソーダを硫酸で中和して得られる微細なものであり、従来のホワイトカーボン粒子より粒径が小さいため、光の散乱性が良好で、白紙の不透明性を向上させることができるものである。
In recent years, color printing of newsprint has been performed, and accordingly, high whiteness that enables clear printing of color images and the like has been demanded on newsprint.
However, the whitening of newsprint tends to cause a decrease in opacity, and it is necessary to increase the whiteness without reducing the opacity for newsprint that requires a low basis weight.
In order to solve these problems, Patent Document 1 discloses a technique for producing newsprint paper using talc, clay or kaolin in combination with white carbon. The white carbon used in this newspaper is a fine one obtained by neutralizing sodium silicate with sulfuric acid, and its particle size is smaller than that of conventional white carbon particles. It is possible to improve the property.
また、特許文献２では、ホワイトカーボンと炭酸カルシウムとを主体とし、これらを灰分の原子吸光分析における割合が９：１〜５：５になるように含有している新聞用紙の技術が開示されている。この新聞用紙は、安価な炭酸カルシウムを使用し、ホワイトカーボンの歩留まりが良好なｐＨ６〜８で処理することで、低いコストで製造することが可能となっている。
前記特許文献１のホワイトカーボンは、微細な形状をしており、使用に際しては硫酸バンド等で凝集させる必要があり、そのため操業時の品質管理が困難であるという問題がある。
また、前記特許文献２の新聞用紙では製造コストは低くできるものの、二次凝集により巨大化したホワイトカーボン粒子相互間およびホワイトカーボン粒子とパルプ繊維との間には空隙が多く存在し、この空隙を光が透過するため、不透明度や白色度の向上効果は十分とは言えない。
The white carbon of Patent Document 1 has a fine shape and needs to be agglomerated with a sulfuric acid band or the like when used. Therefore, there is a problem that quality control during operation is difficult.
In addition, although the manufacturing cost of the newspaper of Patent Document 2 can be reduced, there are many voids between white carbon particles and white carbon particles and pulp fibers which have been enlarged by secondary aggregation. Since light is transmitted, the effect of improving opacity and whiteness is not sufficient.
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、小径の第１填料粒子を大径の第２填料粒子相互間および第２填料粒子とパルプ繊維との空隙に配在させることにより、前記空隙を透過する光を遮断でき、高い不透明度と白色度を発揮できる新聞用紙を提供することを目的とする。
An object of this invention is to provide the newsprint which can solve the said problem.
In the present invention, the first filler particles having a small diameter are arranged between the second filler particles having a large diameter and the gaps between the second filler particles and the pulp fibers, whereby light transmitted through the gaps can be blocked. An object of the present invention is to provide newsprint that can exhibit transparency and whiteness.
前記目的を達成するため、本発明は次の手段を講じた。
即ち、２種類の填料を含む新聞用紙において、第１填料の平均粒子径を第２填料の平均粒子径の１／２〜１／６０に設定して、第１填料粒子を第２填料粒子相互間および第２填料粒子とパルプ繊維との空隙に配在している。
これによって、平均粒子径の大きな第２填料の空隙を透過する光を第１填料で減少でき、高い不透明度と白色度を発揮できる。
前記第１填料の添加量を前記第２填料の添加量の０．１〜９．０倍に設定している。
In order to achieve the above object, the present invention takes the following measures.
That is, in a newsprint including two types of fillers, the average particle diameter of the first filler is set to 1/2 to 1/60 of the average particle diameter of the second filler, and the first filler particles are mutually connected to the second filler particles. And the gaps between the second filler particles and the pulp fibers.
Thereby, the light transmitted through the voids of the second filler having a large average particle diameter can be reduced by the first filler, and high opacity and whiteness can be exhibited.
The addition amount of the first filler is set to 0.1 to 9.0 times the addition amount of the second filler.
これによって、第２填料の平均粒子径に対応して前記空隙を埋めるのに必要な第１填料粒子を配在させることが可能となる。
前記第１填料に、平均粒径が０．５〜５μｍの炭酸カルシウムを用いている。
これによって、安価な炭酸カルシウムを利用することができ、製造コストを下げることができる。また、光の遮断効果を有する０．５〜５μｍに、炭酸カルシウムの平均粒径を揃えることで、炭酸カルシウムの不透明度向上効果を発揮させることが可能となる。
前記第２填料に、平均粒径が１０〜３０μｍのホワイトカーボンを用いている。
This makes it possible to distribute the first filler particles necessary to fill the voids corresponding to the average particle diameter of the second filler.
For the first filler, calcium carbonate having an average particle size of 0.5 to 5 μm is used.
Thereby, inexpensive calcium carbonate can be used, and the manufacturing cost can be reduced. Moreover, it becomes possible to exhibit the opacity improvement effect of calcium carbonate by making the average particle diameter of calcium carbonate uniform to 0.5 to 5 μm having a light blocking effect.
White carbon having an average particle diameter of 10 to 30 μm is used for the second filler.
これによって、ホワイトカーボンの高い不透明度の向上効果を利用することができる。
ｐＨが６．０以上である。
これによって、炭酸カルシウムの溶解を少なくして抄き込むことが可能となる。また、ホワイトカーボンを高歩留まりで利用することが可能となる。
灰分が８．０〜２０．０％である。
これによって、填料を過剰に添加することによる紙支持体の強度低下を防止できると共に、２種類の填料の協働的な効果（不透明度と白色度の双方を満足させる効果）を得ることができる。
As a result, the effect of improving the high opacity of white carbon can be used.
The pH is 6.0 or higher.
As a result, it is possible to carry out papermaking with less dissolution of calcium carbonate. Also, white carbon can be used at a high yield.
Ash content is 8.0 to 20.0%.
As a result, it is possible to prevent a reduction in strength of the paper support due to excessive addition of the filler, and to obtain a cooperative effect of two kinds of fillers (an effect that satisfies both opacity and whiteness). .
坪量が４３〜６４ｇ／ｍ2に抄紙されていて、かつ吸油度８０〜１２０秒、白色度６０％以上または不透明度８８％以上の内の少なくともひとつを満足する。
これによって、低坪量に抄紙してもインクのにじみが起こり難く、カラー画像などが鮮明に印刷でき、印刷の裏抜けが防止できる。
The paper has a basis weight of 43 to 64 g / m 2 and satisfies at least one of oil absorption of 80 to 120 seconds, whiteness of 60% or more, and opacity of 88% or more.
As a result, even when paper is made at a low basis weight, ink bleeding hardly occurs, a color image or the like can be printed clearly, and printing back-through can be prevented.
小径の第１填料粒子を大径の第２填料粒子相互間および第２填料粒子とパルプ繊維との空隙に配在させることにより、第２填料粒子とパルプ繊維との空隙を通して透過する光を減少でき、高い不透明度と白色度を発揮させることができる。 Light transmitted through the gaps between the second filler particles and the pulp fibers is reduced by arranging the first filler particles with a small diameter between the second filler particles with a larger diameter and in the gaps between the second filler particles and the pulp fibers. And high opacity and whiteness can be exhibited.
本発明の実施の形態を以下に詳説する。
本発明の新聞用紙に使用される原料パルプとしては、従来技術と同一で良く、その種類および組合せは適宜設定できる。例えば、リファイナーグランドパルプ（ＲＧＰ）、砕木パルプ（ＧＰ）、サーモメカニカルパルプ（ＴＭＰ）等の機械パルプや、新聞や雑誌などの古紙を原料とした脱墨パルプ（ＤＩＰ）またはこれらを組み合わして使用することができる。また、場合によっては、クラフトパルプ等の化学パルプも使用しても良い。
本発明の新聞用紙の原料パルプには２種類以上の填料が内添されており、これらは異なる粒径の填料粒子で形成されている。これらの２種類以上の填料から選ばれる粒径の小さい方の填料を第１填料および粒径の大きな方を第２填料としたとき、粒径の小さな第１填料粒子は第２填料粒子やパルプ繊維がつくる空隙に配在されることになる。即ち、前記パルプ繊維同士が相互に作り出す網目構造の目の部分、第２填料粒子とパルプ繊維の隙間、および第２填料粒子同士が相互につくり出す隙間が前記空隙と定義でき、この空隙を通って光が紙支持体を透過し、不透明度を低下させていると考えることが出来る。
Embodiments of the present invention will be described in detail below.
The raw material pulp used in the newsprint of the present invention may be the same as that in the prior art, and the type and combination thereof can be set as appropriate. For example, mechanical pulp such as refiner ground pulp (RGP), groundwood pulp (GP), thermomechanical pulp (TMP), deinked pulp (DIP) made from used paper such as newspapers and magazines, or a combination of these can do. In some cases, chemical pulp such as kraft pulp may also be used.
Two or more kinds of fillers are internally added to the raw material pulp of the newsprint of the present invention, and these are formed of filler particles having different particle sizes. When the filler having the smaller particle size selected from these two or more fillers is the first filler and the second filler is the larger particle size, the first filler particles having the smaller particle size are the second filler particles and pulp. It will be distributed in the void created by the fiber. That is, the portion of the mesh structure created by the pulp fibers mutually, the gap between the second filler particles and the pulp fibers, and the gap created by the second filler particles can be defined as the gap, and the gap passes through the gap. It can be considered that light is transmitted through the paper support and the opacity is reduced.
従って、前記空隙に第１填料粒子が引っ掛かり、この空隙を第１填料粒子が充填する場合に不透明度は向上するため、第１填料粒子が前記空隙を充填するように、第１填料粒子と第２填料粒子との間に粒径および粒子の存在比が規定される。なお、前記粒径は填料によっては２次粒子である場合もあるので、１次粒子または２次粒子のいずれも含めて考えることができる。
前記粒径比（第１填料の平均粒子径の第２填料の平均粒子径に対する倍率）は１／６０〜１／２、好ましくは１／２０〜１／６とするのが良い。粒径比を１／６０、好ましくは１／２０より大きくすることで、第１填料粒子の抄き込みの収率を高くすることができる。また、粒径比を１／２、好ましくは１／６より小さくすることで、不透明度の向上効果が高まる。
Therefore, when the first filler particles are caught in the voids and the voids are filled with the first filler particles, the opacity is improved. Therefore, the first filler particles and the first filler particles are filled so that the first filler particles fill the voids. The particle size and the abundance ratio of the particles are defined between the two filler particles. In addition, since the said particle size may be a secondary particle depending on a filler, it can be considered including both a primary particle or a secondary particle.
The particle size ratio (magnification of the average particle size of the first filler to the average particle size of the second filler) is 1/60 to 1/2, preferably 1/20 to 1/6. By making the particle size ratio greater than 1/60, preferably greater than 1/20, the yield of the first filler particles can be increased. Moreover, the effect of improving opacity is enhanced by making the particle size ratio smaller than 1/2, preferably smaller than 1/6.
前記粒子の存在比としては、混合比（重量比で示される第１填料の添加量の第２填料の添加量に対する倍率）を０．１〜９．０、好ましくは０．５〜７．０、更に好ましくは１．０〜４．０にするのが良い。混合比を０．１、好ましくは０．５、更に好ましくは１．０より多くすることで、紙支持体の不透明度を向上させることができる。また、混合比を９．０、好ましくは７．０、更に好ましくは４．０より少なくすることで、過剰に第１填料が添加されてブランケット汚れを起こすのを防ぐことができる。
前記第１填料および第２填料は、一般に製紙用に用いられる填料から選ぶことができる。例えば、クレー、水酸化アルミニウム、二酸化チタン、合成シリカ、タルク、カオリン、炭酸カルシウム、ホワイトカーボンなどの無機填料、あるいはポリスチレン樹脂、尿素ホルムアルデヒド樹脂などの有機填料であり、填料の原料コストや物性を考慮すると、第１填料粒子にホワイトカーボン、第２填料粒子に炭酸カルシウムを選択するのが良い。
As the abundance ratio of the particles, the mixing ratio (the ratio of the addition amount of the first filler shown by weight ratio to the addition amount of the second filler) is 0.1 to 9.0, preferably 0.5 to 7.0. More preferably, it is good to set it as 1.0-4.0. By increasing the mixing ratio to 0.1, preferably 0.5, and more preferably 1.0, the opacity of the paper support can be improved. Further, by making the mixing ratio less than 9.0, preferably 7.0, and more preferably less than 4.0, it is possible to prevent the first filler from being added excessively to cause blanket contamination.
The first filler and the second filler can be selected from fillers generally used for papermaking. For example, inorganic fillers such as clay, aluminum hydroxide, titanium dioxide, synthetic silica, talc, kaolin, calcium carbonate, and white carbon, or organic fillers such as polystyrene resin and urea formaldehyde resin, considering the raw material cost and physical properties of the filler Then, it is preferable to select white carbon for the first filler particles and calcium carbonate for the second filler particles.
第１填料粒子に炭酸カルシウムを利用することで、古紙材料に豊富に含まれる炭酸カルシウムの再利用が可能となり、環境負荷の低減化と低コスト化とが可能になる。また、第２填料粒子にホワイトカーボンを利用することで、新聞用紙の不透明度を高めることが可能になる。
前記炭酸カルシウムは、天然石灰石をボールミル等で粉砕して得られる重質炭酸カルシウム、または生石灰の炭酸化法または炭酸ナトリウムの水酸基置換で得られる軽質炭酸カルシウムのどちらも使用することができる。ただし、製紙機のワイヤー摩耗を考慮すると、軽質炭酸カルシウムを使用するのが好ましい。
By using calcium carbonate for the first filler particles, it is possible to reuse calcium carbonate that is abundantly contained in the waste paper material, thereby reducing the environmental burden and reducing the cost. Further, by using white carbon as the second filler particles, it becomes possible to increase the opacity of the newsprint.
As the calcium carbonate, either heavy calcium carbonate obtained by pulverizing natural limestone with a ball mill or the like, or light calcium carbonate obtained by carbonization of quick lime or hydroxyl substitution of sodium carbonate can be used. However, it is preferable to use light calcium carbonate in consideration of wire wear of a paper machine.
また、炭酸カルシウムは、その製法によって針状、柱状、イガグリ状などの様々な形状をとることで知られているが、これらの形状にも限定されない。ただし、光の散乱性を考慮すると、イガグリ状などのアラゴナイト結晶を有するものが好ましい。
前記炭酸カルシウムは、その１次粒子または２次粒子の粒径がレーザー式の粒度測定器において、粒径０．５〜５．０μｍ、好ましくは粒径１．０〜３．０μｍとするのが良い。粒径を０．５μｍ、好ましくは１．０μｍより大きくすることで、炭酸カルシウム粒子の光散乱性が上がり、白色度を向上させる効果を十分に発揮できるようになる。また、粒径を５．０μｍ、好ましくは３．０μｍより小さくすることで、炭酸カルシウム粒子を前記空隙に配在することが可能となり、不透明度の向上効果を高めることができる。
In addition, calcium carbonate is known to take various shapes such as needle shape, column shape, and bite shape depending on its production method, but is not limited to these shapes. However, in consideration of the light scattering property, those having an aragonite crystal such as a crab shape are preferable.
The calcium carbonate has a primary particle size or secondary particle size of 0.5 to 5.0 μm, preferably 1.0 to 3.0 μm, in a laser type particle size measuring device. good. By making the particle diameter larger than 0.5 μm, preferably larger than 1.0 μm, the light scattering property of the calcium carbonate particles is increased, and the effect of improving the whiteness can be sufficiently exhibited. In addition, by making the particle size smaller than 5.0 μm, preferably less than 3.0 μm, the calcium carbonate particles can be distributed in the voids, and the effect of improving opacity can be enhanced.
前記ホワイトカーボンは、珪酸ソーダを鉱酸で中和して得られる水和珪酸を示し、その１次粒子は約０．０１〜０．０５μｍであるが、通常高次に凝集して２次粒子を形成している。この２次粒子径はレーザー式の粒度測定器において、粒径１０〜３０μｍ、好ましくは粒径１０〜２０μｍとするのが良い。ホワイトカーボンの粒径を１０μｍより大きくすることで、前記炭酸カルシウム粒子がホワイトカーボン粒子相互間およびホワイトカーボン粒子とパルプ繊維との空隙を充填できるようになる。また、ホワイトカーボンの粒径を３０μｍ、好ましくは２０μｍより小さくすることで、前記空隙を炭酸カルシウム粒子が充填して、不透明度を向上させることができる。 The white carbon is a hydrated silicic acid obtained by neutralizing sodium silicate with mineral acid, and its primary particles are about 0.01 to 0.05 μm, but usually agglomerated to secondary particles. Is forming. The secondary particle diameter is 10 to 30 μm, preferably 10 to 20 μm, in a laser particle size measuring instrument. By making the particle size of the white carbon larger than 10 μm, the calcium carbonate particles can fill the gaps between the white carbon particles and between the white carbon particles and the pulp fiber. Further, by making the particle size of the white carbon smaller than 30 μm, preferably less than 20 μm, the voids are filled with calcium carbonate particles, and the opacity can be improved.
前記第１填料および第２填料の紙支持体への添加量は、紙支持体の灰分が８．０〜２０．０重量％、好ましくは１０．０〜１５．０重量％になるように設定するのが良い。灰分を８．０重量％、好ましくは１０．０重量％より多くすることで、前記空隙を充填するように第１填料および第２填料が配在されることとなり、不透明度と白色度とを共に上げることが可能となる。また、灰分を２０．０重量％、好ましくは１５．０重量％より少なくすることで、多量の填料が紙支持体に含まれて強度を低下するのを防止できる。
前記第１填料粒子および第２填料粒子の粒径、粒径比、混合比および灰分の各特性値については、各填料粒子が形成する前記空隙とそれを埋める第１填料粒子とのサイズの関係から、それぞれの特性値には最適な相互間の関係が定められる。
The amount of the first filler and the second filler added to the paper support is set so that the ash content of the paper support is 8.0 to 20.0% by weight, preferably 10.0 to 15.0% by weight. Good to do. By increasing the ash content to 8.0% by weight, preferably more than 10.0% by weight, the first filler and the second filler are distributed so as to fill the void, and the opacity and whiteness are reduced. Both can be raised. Further, by making the ash content less than 20.0% by weight, preferably less than 15.0% by weight, it is possible to prevent a large amount of filler from being contained in the paper support and lowering the strength.
Regarding the particle size, particle size ratio, mixing ratio, and ash characteristic values of the first filler particles and the second filler particles, the relationship between the size of the voids formed by the filler particles and the first filler particles filling the voids. Therefore, the optimum mutual relationship is determined for each characteristic value.
例えば、第１填料粒子の粒径が小さい場合であって、第２填料粒子の粒径が大きい場合は、前記空隙が大きくなり、この空隙を充填するのに第１填料粒子が多く必要になる。従って、混合比は高めの方が好ましく、填料粒子の総数に比例する灰分もやや多めに必要とされる。
また、逆に第１填料粒子と第２填料粒子とが共に小さい場合は、前記空隙のサイズは小さくなるが、それに伴い第１填料粒子の粒径も小さくなっているため、混合比は前例よりはやや小さくなる。しかし、前記空隙はより緻密に第１填料粒子で充填されており、そのため灰分の最適値は多い方が良い。
For example, when the particle diameter of the first filler particles is small and the particle diameter of the second filler particles is large, the gap becomes large, and a large amount of the first filler particles are required to fill the gap. . Therefore, a higher mixing ratio is preferable, and a slightly larger amount of ash proportional to the total number of filler particles is required.
On the contrary, when both the first filler particles and the second filler particles are small, the size of the voids is small, but the particle size of the first filler particles is also small accordingly, so the mixing ratio is more than that of the previous example. Slightly smaller. However, the voids are more densely filled with the first filler particles, so that it is better that the optimum value of ash content is large.
第１填料粒子と第２填料粒子とが共に大きい場合は、前記空隙のサイズは大きくなるが、それに伴い第１填料粒子の粒径も大きくなっているため、混合比は前例同様やや低めの値で良い。しかし、前記空隙はあまり緻密に第１填料粒子で充填されないため、灰分の最適値は低い方が良い。
第１填料粒子の粒径が大きい場合であって、第２填料粒子の粒径が小さい場合は、前記空隙は小さくなるが、この空隙を充填する第１填料粒子は大きいので、混合比は低い方が好ましい。また、填料粒子の総数に比例する灰分も低くするのが好ましい。
When both the first filler particles and the second filler particles are large, the size of the voids is increased, but the particle size of the first filler particles is also increased accordingly, so the mixing ratio is a slightly lower value as in the previous example. Good. However, since the voids are not very densely filled with the first filler particles, it is better that the optimum value of ash content is low.
When the particle size of the first filler particles is large and the particle size of the second filler particles is small, the voids are small, but the first filler particles filling the voids are large, so the mixing ratio is low. Is preferred. It is also preferable to reduce the ash content proportional to the total number of filler particles.
本発明の新聞用紙の原料パルプスラリーは、ｐＨ６．０以上とするのが好ましい。パルプスラリーのｐＨを６．０以上とすることで、炭酸カルシウムの溶解を少なくすることができる。また、抄紙された紙支持体は中性紙となるため、耐候性に優れ、長期保管しても褪色しない新聞用紙を得ることが可能となる。
本発明の新聞用紙の紙支持体は、坪量４３〜６４ｇ／ｍ2に抄紙しても、高い白色度または高い不透明度、具体的には白色度６０％以上または不透明度８８％以上を満足させることが可能である。また、吸油性に優れるホワイトカーボンを含むため、吸油度６０〜１２０秒を満足することができる。これによって、低坪量に抄紙してもインクのにじみが起こり難く、カラー画像などが鮮明に印刷でき、印刷特性を良好にする効果も有している。
［実施例］
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。
It is preferable that the raw material pulp slurry of the newsprint of the present invention has a pH of 6.0 or higher. By setting the pH of the pulp slurry to 6.0 or more, dissolution of calcium carbonate can be reduced. In addition, since the paper support made of paper becomes neutral paper, it is possible to obtain newsprint paper that has excellent weather resistance and does not deteriorate even after long-term storage.
The newsprint paper support of the present invention satisfies high whiteness or high opacity, specifically, whiteness of 60% or more or opacity of 88% or more even when paper is made at a basis weight of 43 to 64 g / m 2. It is possible to make it. Moreover, since white carbon which is excellent in oil absorbency is included, the oil absorbency of 60 to 120 seconds can be satisfied. As a result, even when paper is made at a low basis weight, ink bleeding hardly occurs, color images and the like can be printed clearly, and the printing characteristics are improved.
[Example]
Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to these examples.
本発明の第１填料に炭酸カルシウム（東洋デンカ社製、商品名「ＴＮＣ−Ｃ」）、第２填料にホワイトカーボン（エリエール商工製）を選び、これらの粒径と混合率を変化させた填料を、古紙パルプ７０重量％と機械パルプ３０重量％とで成る原料パルプのパルプスラリーに添加し、坪量４９ｇ／ｍ2の紙支持体に抄紙した後、その吸油度、白色度、不透明度などの評価を行った。表１に結果を示す。なお、表１における第１填料は炭酸カルシウム、第２填料はホワイトカーボンである。 Calcium carbonate (manufactured by Toyo Denka Co., Ltd., trade name “TNC-C”) is selected as the first filler of the present invention, and white carbon (manufactured by Eliere Shoko) is selected as the second filler. Is added to a pulp slurry of raw material pulp consisting of 70% by weight of waste paper pulp and 30% by weight of mechanical pulp, and after making paper on a paper support having a basis weight of 49 g / m 2 , its oil absorption, whiteness, opacity, etc. Was evaluated. Table 1 shows the results. In Table 1, the first filler is calcium carbonate, and the second filler is white carbon.
表１の粒径はレーザー式粒度計（嶋津製作所社製、型式番号「ＳＡＬＤ−２０００Ａ」）による平均粒子径であり、混合比は填料の総添加量に対する各填料の添加量を重量％で示したものである。また、粒径比は第２填料のホワイトカーボンの平均粒子径に対する第１填料の炭酸カルシウムの平均粒子径の倍率を示す値であり、混合比は第２填料添加量に対する第１填料添加量の重量比を示している。 The particle diameters in Table 1 are average particle diameters measured by a laser particle size meter (manufactured by Shimadzu Corporation, model number “SALD-2000A”), and the mixing ratio indicates the amount of each filler added in terms of weight% relative to the total amount of filler added. It is a thing. The particle size ratio is a value indicating the ratio of the average particle size of calcium carbonate of the first filler to the average particle size of white carbon of the second filler, and the mixing ratio is the amount of the first filler added to the amount of the second filler added. The weight ratio is shown.
また、表１において、ｐＨはＪＩＳ Ｐ−８１３３（１９９８年）に、灰分はＪＩＳ Ｐ−８２５１（２００３年）に、白色度はＪＩＳ Ｐ−８１４８（２００１年）に、不透明度はＪＩＳ Ｐ−８１４９（２０００年）に、それぞれ従って測定した。
また、吸油度は１辺１００ｍｍの正方形に切り出された試料片の１０ｍｍ上方から、ＪＩＳ Ｋ２２０４の１号軽油（動粘度２．７ｍｍ2／ｓｅｃ）を所定の注射器（ＪＩＳ Ｔ３１０２中口、２ｍｌ用）に注射針（ＪＩＳ Ｔ３１０１のＨ５号）を装着し、１滴（約４ｍｇ）滴下させ、軽油が試料片に吸油され油滴の表面光沢が消失されるまでの秒数（試料片の表裏各４件の平均値）で判断した。
In Table 1, pH is JIS P-8133 (1998), ash is JIS P-8251 (2003), whiteness is JIS P-8148 (2001), and opacity is JIS P-8149. (2000), respectively, were measured accordingly.
The oil absorption is 10 mm above the sample piece cut into a square with a side of 100 mm, and a JIS K2204 No. 1 light oil (kinematic viscosity 2.7 mm 2 / sec) is used as a predetermined syringe (for JIS T3102 middle mouth, 2 ml). Attach a syringe needle (JIS T3101 No. H5), drop 1 drop (about 4 mg), and the number of seconds (4 each for the front and back of the sample piece) until light oil is absorbed into the sample piece and the surface gloss of the oil drop disappears. Average value).
裏抜けはＲＩ印刷機で、オフセット輪転印刷用インキ（墨）のインキ量を変えて印刷し、印刷面反射率が９％の時の、印刷前と印刷後の裏面（印刷面の反対面）の反射率の比率を求めた。
反射率の測定は、カラーアナライザー（マクベスグレタグ社製）を用いて測定した。ＢＫ（ブラケット）汚れは、オフセット印刷機（小森社製、Ｃ−２０型）を用いて、オフセット輪転印刷用インキ４色で連続６０００部を印刷した後、ブランケットの画線部と非画線部の紙粉の堆積度合いを目視で判定した。
The back side is printed on the RI printing machine with different amounts of ink for rotary printing (black), and the back side before printing and after printing (opposite side of the printing side) when the printing surface reflectance is 9%. The reflectance ratio was obtained.
The reflectance was measured using a color analyzer (manufactured by Macbeth Gretag). BK (bracket) stains are printed on continuous printing 6000 parts with four colors of offset rotary printing ink using an offset printing machine (C-20, manufactured by Komori Co., Ltd.). The degree of paper dust accumulation was visually determined.
填料歩留は、ＩＳＯ４１１９−１９７８に準じてインレット及びワイヤー下白水から試料を採取して重量を測定し、ＪＩＳ Ｐ−８２０４に準じて灰分を測定して、インレット試料中の灰分に対するワイヤー下試料中の灰分の比率を算出した。
紙支持体の評価結果は、規格範囲を定めてその範囲内であるか否かを○×で示した。即ち、吸油度については、８０〜１００秒を○、６０〜８０秒および１００〜１２０秒を△、６０秒未満及び１２０秒を超えるものを×とし、裏抜けについては、９２％以上のものを○、８８％以上９２％未満のものを△、８８％未満のものを×とした。さらに、ＢＫ（ブラケット）汚れについては○（紙粉の発生が認められない。）、△（紙粉の発生がやや認められる。）、×（ブランケット上に紙粉が多く堆積している。）とし、填料歩留は、３０％以上のものを○、１０〜２９％のものを△、１０％未満のものを×と評価した。
The filler yield is measured by taking a sample from the inlet and white water under the wire according to ISO 4119-1978, measuring the weight, measuring the ash according to JIS P-8204, and measuring the ash in the inlet sample. The ratio of ash content was calculated.
As for the evaluation results of the paper support, a standard range was defined, and whether or not it was within the range was indicated by ○ ×. That is, for oil absorption, 80 to 100 seconds is ○, 60 to 80 seconds and 100 to 120 seconds are Δ, less than 60 seconds and more than 120 seconds are ×, and the back-through is 92% or more. ○, 88% or more and less than 92% were evaluated as Δ, and less than 88% were evaluated as ×. Furthermore, with respect to BK (bracket) stains, ○ (the occurrence of paper dust is not recognized), Δ (the occurrence of paper dust is slightly recognized), × (a lot of paper dust is deposited on the blanket). The filler yield was evaluated as ◯ for 30% or more, Δ for 10-29%, and × for less than 10%.
不透明度、吸油度、裏抜け、ＢＫ汚れ、填料歩留の評価結果に関して、全ての評価項目において○を得、かつ白色度が６５％を超えたものを総合評価◎とし、いずれの評価項目も○もしくは△、かつ白色度が６０〜６５％のものを総合評価○とし、×の評価が１つでもある場合は総合評価×を下した。なお、比較例６は本来○の総合評価であるが、填料使用量が多く、製造コスト的に高いというディメリットを有するため、△の総合評価とした。 Regarding the evaluation results of opacity, oil absorption, back-through, BK dirt, and filler yield, all evaluation items were evaluated as ○ and whiteness exceeded 65% as overall evaluation ◎. ○ or Δ, and a whiteness of 60 to 65% was evaluated as overall evaluation ○, and when there was at least one evaluation of ×, overall evaluation × was given. Although Comparative Example 6 is originally a comprehensive evaluation of ◯, it has a demerit that the amount of filler used is large and the manufacturing cost is high.
平均粒径０．４μｍの炭酸カルシウムを用いた比較例１と比べると、吸油度、不透明度、裏抜けおよび填料歩留でいずれも良好な評価結果となっており、第１填料粒子の粒径は０．５μｍより大きい方が好ましいことが分かる。 Compared to Comparative Example 1 using calcium carbonate having an average particle size of 0.4 μm, the oil absorption, opacity, back-through and filler yield were all good, and the particle size of the first filler particles It can be seen that it is preferable to be larger than 0.5 μm.
第１填料の混合率が５％で、混合比が０．０５の比較例４と比べると、不透明度、裏抜け、ＢＫ汚れおよび填料歩留でいずれも良好な結果を得ており、第１填料の混合率として１０％より高い混合率、または混合比として０．１より高い混合比であるのが好ましいことが分かる。 Compared with Comparative Example 4 in which the mixing ratio of the first filler is 5% and the mixing ratio is 0.05, the opacity, the back-through, the BK stain, and the filler yield are all good. It can be seen that it is preferable that the mixing ratio of the filler is higher than 10%, or the mixing ratio is higher than 0.1.
平均粒径６．０μｍの炭酸カルシウムを用いた比較例２と比べると、吸油度およびＢＫ汚れでいずれも良好な評価結果となっており、第１填料粒子の粒径は５．０μｍより小さい方が好ましいことが分かる。 Compared with Comparative Example 2 using calcium carbonate having an average particle size of 6.0 μm, both the oil absorption and BK stains are good evaluation results, and the particle size of the first filler particles is smaller than 5.0 μm. It turns out that is preferable.
光遮断効果の高いホワイトカーボンの添加量が少ないため、不透明度がやや低く、総合評価も○となっている。 Opacity is slightly low due to the small amount of white carbon added, which has a high light blocking effect.
本実施例より灰分の量が多い比較例６と比べると、灰分２０％の本実施例は灰分２２％の比較例６よりブランケット汚れの評価が良くなく、灰分を２０％より少なくすることでブランケット汚れを防げることが分かる。 Compared with Comparative Example 6 in which the amount of ash is larger than that of the present Example, this Example with an ash content of 20% has a poorer evaluation of blanket dirt than Comparative Example 6 with an ash content of 22%, and the blanket can be reduced by making the ash content less than 20%. It turns out that it can prevent dirt.
粒径比が実施例の中で最も大きな１／２である本実施例でも不透明度などの評価項目を満足していることが分かる。従って、粒径比を少なくとも１／２以下にすることで、第１填料が前記空隙を充填し、不透明度の向上効果を生むものと考えられる。 It can be seen that even in this example, in which the particle size ratio is the largest half of the examples, evaluation items such as opacity are satisfied. Therefore, it is considered that when the particle size ratio is at least ½ or less, the first filler fills the voids and produces an effect of improving opacity.
評価項目の全てについて良好な評価を得た。このことから粒径比が１／６０と粒径差の大きな填料粒子であっても、灰分を９％より多くすることで高い評価が得られることが分かり、粒径比１／６０以上とすることで、前記空隙に第１填料粒子が充填される効果を得られることが分かる。
また、実施例７より紙支持体のｐＨが低い比較例４では、炭酸カルシウムの溶解が起こるため、炭酸カルシウムの光遮断効果が得にくくなり、不透明度が低下している。このことから、紙支持体のｐＨとしては６．０以上とする方が良いことが分かる。
Good evaluation was obtained for all of the evaluation items. From this, it can be seen that even if the particle size ratio is 1/60 and the filler particles have a large particle size difference, high evaluation can be obtained by increasing the ash content to more than 9%. Thus, it can be seen that the effect of filling the voids with the first filler particles can be obtained.
Further, in Comparative Example 4 in which the pH of the paper support is lower than that of Example 7, since dissolution of calcium carbonate occurs, it becomes difficult to obtain the light blocking effect of calcium carbonate, and the opacity is lowered. From this, it is understood that the pH of the paper support is preferably 6.0 or more.
全ての評価項目で最も高い評価を得た。このことから、本実施例の条件が実施例の中で不透明度と白色度とを最も高い基準で満足できると考えられる。 The highest evaluation was obtained for all evaluation items. From this, it is considered that the conditions of the present example can satisfy the opacity and whiteness on the highest standard in the examples.
実施例７と比べて、第１粒径が１０倍と大きいものの、第２粒径を小さくして粒径比が近づいており、粒径比は１／２と最も大きい。しかし、実施例７同様の良好な評価結果を得ており、粒径比が１／２でも不透明度と白色度とを最も高い基準で満足できることが分かる。
［比較例１］
第１填料の粒径、第２填料の粒径とも小さく、そのためパルプ繊維の隙間を粒子が通り抜けやすく、吸油度、不透明度、裏抜けおよび填料歩留の点で評価が良くない。
［比較例２］
第１填料の粒径、第２填料の粒径とも大きく、ため、吸油度およびブランケット汚れの点で評価が良くない。
［比較例３］
第１填料が第２填料より多く添加され、光遮断効果を有するホワイトカーボンが少なく、不透明度および裏抜けの点で評価が良くない。
［比較例４］
第２填料が第１填料より多く添加され、前記空隙を充填できる十分な量の第１填料粒子が不足しており、ｐＨも低いため炭酸カルシウムの溶解により光の遮断効果も低下している。従って、不透明度の点で評価が良くない。
［比較例５］
灰分の含有量が少なく、各填料粒子の粒径、混合率、粒径比および混合比では規格内であるが、各填料粒子の総量が少なく、光の透過を遮断できないため、吸油度、不透明度および裏抜けの点で評価が良くない。
［比較例６］
灰分が２２％と最も多く、各填料粒子が過剰に含まれるため、ブランケット汚れが発生しており、総合評価も低くなっている。
［総合評価］
実施例１〜９と比較例１〜６とを比較すると、各填料粒子の粒径、混合率、粒径比および混合比が規格範囲を超えると評価項目のいずれかが低下する傾向があることが分かる。また、填料の総量を規定する灰分も、評価結果を変動させる大きな要因となる。
Compared to Example 7, the first particle size is as large as 10 times, but the second particle size is reduced to approach the particle size ratio, and the particle size ratio is the largest at 1/2. However, good evaluation results similar to those of Example 7 were obtained, and it can be seen that even when the particle size ratio is 1/2, the opacity and whiteness can be satisfied with the highest standard.
[Comparative Example 1]
Both the particle size of the first filler and the particle size of the second filler are small, so that the particles easily pass through the gaps of the pulp fibers, and the evaluation is not good in terms of oil absorption, opacity, back-through and filler yield.
[Comparative Example 2]
Since both the particle size of the first filler and the particle size of the second filler are large, the evaluation is not good in terms of oil absorption and blanket contamination.
[Comparative Example 3]
The first filler is added more than the second filler, the amount of white carbon having a light blocking effect is small, and the evaluation is not good in terms of opacity and penetration.
[Comparative Example 4]
The second filler is added more than the first filler, the amount of the first filler particles sufficient to fill the voids is insufficient, and the pH is low, so that the light blocking effect is reduced due to dissolution of calcium carbonate. Therefore, evaluation is not good in terms of opacity.
[Comparative Example 5]
The content of ash is small and the particle size, mixing ratio, particle size ratio and mixing ratio of each filler particle are within the specifications, but the total amount of each filler particle is small and light transmission cannot be blocked. Evaluation is not good in terms of transparency and show-through.
[Comparative Example 6]
Since the ash content is the largest at 22% and each filler particle is excessively contained, blanket contamination occurs and the overall evaluation is also low.
[Comprehensive evaluation]
When Examples 1-9 are compared with Comparative Examples 1-6, when the particle size, mixing ratio, particle size ratio, and mixing ratio of each filler particle exceed the standard range, any of the evaluation items tends to decrease. I understand. In addition, the ash that defines the total amount of filler is also a major factor that fluctuates the evaluation results.
ただし、ｐＨについては、ｐＨが規格より低い場合は炭酸カルシウムの溶解を招くため、評価結果を低下させる可能性があるが、高い場合は評価結果を低くする直接原因とはなっていない。また、第１填料に炭酸カルシウムを用いない場合はｐＨ５．０以下でも使用できる。 However, with respect to pH, when the pH is lower than the standard, dissolution of calcium carbonate is caused, so that the evaluation result may be lowered. However, when the pH is high, it is not a direct cause of lowering the evaluation result. Further, when calcium carbonate is not used for the first filler, it can be used even at a pH of 5.0 or less.
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| JP2008095260A (en) * | 2006-10-06 | 2008-04-24 | Marusumi Paper Co Ltd | Paper for newspaper |
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