JP2012219415A - Envelope paper having high brightness and high opacity - Google Patents

Envelope paper having high brightness and high opacity Download PDF

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JP2012219415A
JP2012219415A JP2011088706A JP2011088706A JP2012219415A JP 2012219415 A JP2012219415 A JP 2012219415A JP 2011088706 A JP2011088706 A JP 2011088706A JP 2011088706 A JP2011088706 A JP 2011088706A JP 2012219415 A JP2012219415 A JP 2012219415A
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paper
envelope
pulp
opacity
mass
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Yukio Kato
幸夫 加藤
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Marusumi Paper Co Ltd
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Marusumi Paper Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide an envelope paper that has high brightness, high opacity, bag-making processing suitability and sealing suitability that is suitable for a high speed process of an automatic enclosing and sealing machine.SOLUTION: The envelope paper satisfies the following conditions (1) to (6): (1) wood-free waste paper pulp is blended in an amount of 20 to 50 mass%; (2) NBKP is included in an amount of 5 to 20 mass%; (3) calcium carbonate is added in an amount of 8% or more and the ash content is 5.0 to 15%; (4) a fluorescent dye is added and the fluorescence intensity is 5 to 10%; (5) the brightness is 80% or higher; and (6) the opacity is 90% or higher. Further, it is preferable that the following conditions (7) to (11) are satisfied: (7) the basis weight is 70 to 120 g/m; (8) the Stockigt-sizing degree is 15 seconds of more; (9) the smoothness is 30 to 80 seconds; (10) the Clark stiffness in a longitudinal direction is 70 to 240 cm/100; and (11) the oil absorbency is 40 to 100 seconds.

Description

本発明は、白色度と不透明度が高く、製袋加工適性と高速化された自動封入封緘機に対応できる封緘適性を備えた封筒用紙に関する。 The present invention relates to an envelope sheet having high whiteness and opacity, and having a sealing ability suitable for a bag making process and a high-speed automatic sealing machine.

封筒用紙は、封筒の中身の文字が見えないことが必要とされているが、近年、個人情報の保護が着目されるようになり、ますます封筒の不透明性が求められている。
封筒用紙の中でも、未漂白パルプを使用したものや着色したものは、明度が低いため、比較的坪量が低くても不透明度の確保が容易である。一方、白色の封筒用紙は、印刷のデザインや色調の自由度が高く、高級感を醸し出すことができるので、要望が多いが、不透明度を高くするのは難しい。このような封筒用紙は、白色度が高いことに加え、前述したように中身の情報保護という観点から、高い不透明度が必要である。
封筒の中身が見えないようにするため、封筒を2層構造にしたり、封筒の内側になる面、あるいは外側になる面に、地紋印刷を行ったりすることがある。しかし、資材の種類や製造工程が増えるため、製造コストのアップとなる。
封筒用紙の白色度や不透明度の対策として、一般の印刷用紙と同様に、填料を多く配合したり、蛍光増白剤を添加して見た目の白さを向上させることがなされている。しかし、填料の配合が多くなると、紙の強度や剛度が低下してしまうし、蛍光増白剤の効果には限界がある。
Envelope paper is required not to be able to see the characters inside the envelope, but in recent years, protection of personal information has attracted attention, and the opacity of envelopes is increasingly required.
Among envelope papers, those using unbleached pulp or colored ones have low brightness, so that it is easy to ensure opacity even if the basis weight is relatively low. On the other hand, white envelope paper has a high degree of freedom in printing design and color tone and can bring out a high-class feeling, so there are many requests, but it is difficult to increase opacity. In addition to high whiteness, such envelope paper requires high opacity from the viewpoint of protecting the contents as described above.
In order to prevent the contents of the envelope from being seen, the envelope may have a two-layer structure, or background pattern printing may be performed on the inner surface or the outer surface of the envelope. However, since the types of materials and manufacturing processes increase, the manufacturing cost increases.
As measures against the whiteness and opacity of envelope paper, as in general printing paper, a large amount of filler is added, or a fluorescent whitening agent is added to improve the apparent whiteness. However, when the amount of filler is increased, the strength and rigidity of the paper are lowered, and the effect of the fluorescent brightener is limited.

近年、銀行,証券会社,クレジットカード会社,百貨店,量販店などでは、封筒を使用した大量のダイレクトメールを顧客に送付している。その場合の封入物の封入封緘は、自動封入封緘機により行われる。
製袋機で製造された封筒のフラップ部の内側には、多くの場合、口糊として、アラビア糊やポリビニルアルコールなどの再湿糊が塗布されている。自動封入封緘機では、封入される複数の封入物を連続フィードして封入し、フラップ部の糊を水で活性化し、フラップ部を折り返して封緘する。そのために、糊が所定の位置に塗布されていない封筒が混入していると接着不良となり、ひどい場合は半開封状態で送付されてしまうことになる。
製袋機では、封筒型紙(封筒の状態に折り畳まれる前の紙)をフィーダーに積載して、1枚づつフィードし、糊が塗布される部分が露出するようにコンベア上に並べ、塗布ロールで糊を塗布し、乾燥する。しかし、封筒の口糊や、胴糊の塗布工程で不良品の発生を抑えることは極めて難しく、紙が重なった状態や曲がった状態でフィードされると糊が所定の位置に塗布されないものや、糊が部分的にしか塗布されないものが製造される。
このように、封筒用紙の紙質が適正な範囲にないと、製袋機で製造される封筒の品質が安定せず、自動封入封緘機で封緘に失敗し不良が発生する原因となってしまう。近年は自動化、高速化が志向されていることもあり、封筒用紙に要求される品質はますます厳しいものとなっている。
In recent years, banks, securities companies, credit card companies, department stores, mass merchandisers, etc. send a large amount of direct mail using envelopes to customers. In that case, the sealed enclosure of the inclusion is performed by an automatic enclosure sealing machine.
In many cases, re-moistening paste such as Arabic paste or polyvinyl alcohol is applied as the mouth paste to the inside of the flap portion of the envelope manufactured by the bag making machine. In the automatic sealing and sealing machine, a plurality of sealed materials are continuously fed and sealed, the flap portion paste is activated with water, and the flap portion is folded back and sealed. Therefore, if an envelope in which glue is not applied at a predetermined position is mixed in, an adhesion failure occurs, and if it is severe, it will be sent in a semi-opened state.
In a bag making machine, envelope-type paper (paper that has not been folded into an envelope state) is stacked on a feeder, fed one by one, arranged on a conveyor so that the area where glue is applied is exposed, Apply glue and dry. However, it is extremely difficult to suppress the occurrence of defective products in the envelope mouth paste and body paste application process, when the paper is overlapped or bent and fed, the glue is not applied in place, A product is produced in which the glue is only partially applied.
Thus, if the paper quality of the envelope paper is not within an appropriate range, the quality of the envelope manufactured by the bag making machine will not be stable, and the automatic sealing and sealing machine will fail to seal and cause a defect. In recent years, there has been a trend toward automation and speeding up, and the quality required for envelope paper has become increasingly severe.

印刷用紙や封筒用紙に関して、白色度や印刷適性の向上、蛍光強度について特定したものとしては、次のような出願がある。
(特許文献1)
木材パルプを主原料とした中性原紙に、蛍光増白剤、染顔料、水溶性バインダーおよびカチオン性高分子定着剤を主成分とする塗工液を塗工したインクジェット記録用紙であり、かつ、塗工された紙のキセノンフラッシュランプを光源に使用してJISP−8148に規定される測定法により測定されたISO白色度が95%以上、および蛍光強度が7〜15%であることを特徴とするインクジェット記録用紙。
(課題)記録面に顔料を用いたコーティングを施していない、いわゆる普通紙タイプであり、記録画像の画像濃度、色再現性に優れ、さらに印字部の耐水性と面強度に優れたインクジェット記録用紙を提供する。
(特許文献2)
原紙の両面に、顔料と接着剤を含有する塗被層を少なくとも2層有する印刷用塗被紙において、白紙光沢度が45〜55%、パーカープリントサーフ粗さが0.6〜1.3μm、白色度が87.0〜95.0%、蛍光強度が5.0〜10.0、L*値が92.5〜98.0、かつb*値が−3.5〜−8.0であることを特徴とする印刷用塗被紙。
(課題)写真などの図柄印刷部の冴えや見栄えに優れ、しかも文字印刷の可読性に優れた印刷用塗被紙を提供する。
(特許文献3)
木材パルプ及び/又は古紙パルプからなる原料パルプを長網式抄紙機にて抄紙してなり、乾燥紙力増強剤及び湿潤紙力増強剤を含有し、灰分含有量が10質量%以下であり、横方向のガーレー剛度が1.80〜8.00mNであり、横方向の水中伸度が2.30%以下であることを特徴とするレーザープリンター用封筒用紙。
(課題)封筒としての堅牢さを備え、高湿環境下に保管された状態でレーザープリンターに供給された場合でも、転写抜けや紙シワが発生しないレーザープリンター用封筒と、その封筒の作製に用いる用紙を提供する。
(特許文献4)
原料パルプの20質量%以上を古紙パルプとし、前記原料パルプに中性ロジンサイズ剤及び炭酸カルシウムを灰分が5〜15質量%、不透明度が85%以上となるように添加し、プレス工程と前記乾燥工程との間で、原料パルプにポリアクリルアミド系樹脂を0.15〜0.6g/m2スプレー塗布することにより、前記艶面の紙面pHを5.5〜8.0、75度鏡面白紙光沢度を25〜40%とするとともに、横方向(CD方向)の引裂強さを800〜1300mN、縦方向(MD方向)の引張強さを6〜10kN/mとする、片艶紙の製造方法。
(課題)中性pH領域で抄紙しながらも、ヤンキードライヤーへの湿紙の貼り付きが良好で、片艶紙艶面の白紙光沢が高く、経年劣化を抑えた、また、サイズ性、不透明度、引張強さ、引裂強さのある片艶紙の製造方法を提供する。
しかし、いずれも、製袋加工適性や自動封入封緘機に対応できる封緘適性については、検討されていない。
Regarding printing paper and envelope paper, there are the following applications for specifying whiteness, improved printability, and fluorescence intensity.
(Patent Document 1)
An ink jet recording paper in which a neutral base paper mainly composed of wood pulp is coated with a coating liquid mainly composed of a fluorescent whitening agent, a dye / pigment, a water-soluble binder and a cationic polymer fixing agent, and The ISO whiteness measured by the measuring method specified in JISP-8148 using a coated paper xenon flash lamp as a light source is 95% or more, and the fluorescence intensity is 7 to 15%. Inkjet recording paper.
(Problem) Inkjet recording paper, which is a so-called plain paper type in which the recording surface is not coated with a pigment, is excellent in image density and color reproducibility of the recorded image, and is excellent in water resistance and surface strength of the printed portion. I will provide a.
(Patent Document 2)
In a printing coated paper having at least two coating layers containing a pigment and an adhesive on both sides of the base paper, the blank paper glossiness is 45 to 55%, the Parker print surf roughness is 0.6 to 1.3 μm, Whiteness is 87.0 to 95.0%, fluorescence intensity is 5.0 to 10.0, L * value is 92.5 to 98.0, and b * value is -3.5 to -8.0. A coated paper for printing, characterized by being.
(Problem) To provide a coated paper for printing which is excellent in the appearance and appearance of a pattern printing part such as a photograph and has excellent readability of character printing.
(Patent Document 3)
Paper pulp made of wood pulp and / or waste paper pulp is made with a long net paper machine, contains a dry paper strength enhancer and a wet paper strength enhancer, and an ash content is 10% by mass or less, An envelope paper for a laser printer, wherein the lateral Gurley stiffness is 1.80 to 8.00 mN, and the lateral underwater elongation is 2.30% or less.
(Problem) Envelopes for laser printers that have robustness as envelopes and are stored in a high-humidity environment so that they do not cause transfer omissions or paper wrinkles, and are used to produce the envelopes Provide paper.
(Patent Document 4)
20% by mass or more of the raw material pulp is used paper pulp, neutral rosin sizing agent and calcium carbonate are added to the raw material pulp so that the ash content is 5 to 15% by mass and the opacity is 85% or more. Between the drying step, 0.15 to 0.6 g / m 2 of polyacrylamide resin is applied to the raw pulp by spraying, so that the glossy paper has a pH of 5.5 to 8.0 and a 75 ° specular white paper. Manufacture of glossy paper with glossiness of 25-40%, tear strength in the transverse direction (CD direction) of 800-1300 mN, and tensile strength in the longitudinal direction (MD direction) of 6-10 kN / m Method.
(Problem) While making paper in a neutral pH range, wet paper sticks well to the Yankee dryer, the glossiness of the glossy side of the glossy paper is high, aging degradation is suppressed, and size and opacity Provided is a method for producing glossy paper having tensile strength and tear strength.
However, in any case, the suitability for bag making and the suitability for sealing that can be applied to the automatic sealing and sealing machine have not been studied.

特開2000−6515号公報JP 2000-6515 A 特開2004−285552号公報JP 2004-285552 A 特開2006−085051号公報JP 2006-085051 A 特開2009−138294号公報JP 2009-138294 A

本発明の課題は、白色度、不透明度が高く、製袋加工適性と自動封入封緘機の高速化に適した封緘適性を備えた封筒用紙を提供することである。 An object of the present invention is to provide an envelope paper having high whiteness and opacity, and suitable for bag-making and suitable for speeding up an automatic sealing machine.

本発明者は、封筒用紙の紙質と、封筒用紙の自動封入封緘機での作業性の関係について検討した結果、封筒用紙のパルプ配合、填料、灰分、蛍光強度、白色度、不透明度、坪量、ステキヒトサイズ度、平滑度、クラークこわさ、吸油度を特定することにより、上記課題を解決できることを見出した。 As a result of examining the relationship between the paper quality of the envelope paper and the workability of the automatic envelope sealing machine for the envelope paper, the present inventor found that the pulp composition of the envelope paper, filler, ash, fluorescence intensity, whiteness, opacity, basis weight It has been found that the above-mentioned problems can be solved by specifying the Steecht sizing degree, smoothness, Clark stiffness, and oil absorption.

請求項1に係る発明は、以下の(1)から(6)の条件を満たす封筒用紙である。
(1)上質古紙パルプを20〜50質量%配合する。
(2)NBKPを5〜20質量%含む。
(3)炭酸カルシウム8%以上添加し、灰分5.0〜15%
(4)蛍光染料を添加し、蛍光強度5〜10%
(5)白色度80%以上
(6)不透明度90%以上
請求項2に係る発明は、請求項1に記載の封筒用紙であって、以下の(7)〜(11)の条件を満たす封筒用紙である。
(7)坪量70〜120g/m
(8)ステキヒトサイズ度15秒以上
(9)平滑度30〜80秒
(10)クラークこわさ縦70〜240cm/100
(11)吸油度40〜100秒
The invention according to claim 1 is an envelope paper that satisfies the following conditions (1) to (6).
(1) 20-50 mass% of high-quality waste paper pulp is blended.
(2) NBKP is contained in 5 to 20% by mass.
(3) Add calcium carbonate 8% or more, ash 5.0-15%
(4) Fluorescent dye added, fluorescence intensity 5-10%
(5) Whiteness 80% or more (6) Opacity 90% or more The invention according to claim 2 is the envelope paper according to claim 1, and satisfies the following conditions (7) to (11) It is paper.
(7) Basis weight 70-120 g / m 2
(8) Stockigt sizing degree of 15 seconds or more (9) smoothness 30-80 seconds (10) Clark stiffness longitudinal 70~240cm 3/100
(11) Oil absorption 40 to 100 seconds

本発明によれば、白色度と不透明度が高く、自動封入封緘機の高速化にも対応できる封筒用紙を提供することができる。 According to the present invention, it is possible to provide an envelope paper that has high whiteness and opacity, and can cope with an increase in the speed of an automatic sealing machine.

以下、本発明の実施の形態を説明する。
本発明の封筒用紙の製造には、ワイヤーパート、プレスパート、ドライヤーパート、リールパートの各工程からなる抄紙機を用いる。抄紙機の型式は特に限定はなく、長網抄紙機、ツインワイヤー抄紙機等を使用できる。ドライヤーパートは多筒ドライヤー、ヤンキードライヤーやこれらを組み合わせたものでもよい。オントップ型やギャップフォーマー型のツインワイヤー抄紙機が望ましく、特に両面から均等に脱水するギャップフォーマー型抄紙機が望ましい。
Embodiments of the present invention will be described below.
For the manufacture of the envelope paper of the present invention, a paper machine comprising the steps of a wire part, a press part, a dryer part, and a reel part is used. The type of the paper machine is not particularly limited, and a long net paper machine, a twin wire paper machine, or the like can be used. The dryer part may be a multi-cylinder dryer, a Yankee dryer, or a combination of these. An on-top type or gap former type twin wire paper machine is desirable, and a gap former type paper machine that dehydrates evenly from both sides is particularly desirable.

本発明の封筒用紙は、原料パルプとして、クラフトパルプ、古紙パルプ、機械パルプ等が使用できる。クラフトパルプとしては、針葉樹晒クラフトパルプ(NBKP)、広葉樹晒クラフトパルプ(LBKP)等が使用できる。また、古紙パルプとしては、新聞古紙脱墨パルプ、上質古紙脱墨パルプ等の古紙脱墨パルプ(DIP)が使用できる。機械パルプとしては、ストーングラウンドパルプ(SGP)、加圧ストーングランドパルプ(PGP)、リファイナーグランドパルプ(RGP)、サーモメカニカルパルプ(TMP)、ケミサーモメカニカルパルプ(CTMP)等を使用することができる。 The envelope paper of the present invention can use kraft pulp, waste paper pulp, mechanical pulp, etc. as raw pulp. As kraft pulp, softwood bleached kraft pulp (NBKP), hardwood bleached kraft pulp (LBKP) and the like can be used. In addition, as waste paper pulp, waste paper deinking pulp (DIP) such as newspaper waste paper deinking pulp and high-quality waste paper deinking pulp can be used. As the mechanical pulp, stone ground pulp (SGP), pressurized stone ground pulp (PGP), refiner ground pulp (RGP), thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP), or the like can be used.

本発明の封筒用紙は、全パルプ中針葉樹クラフトパルプを5〜20質量%含有している。
針葉樹クラフトパルプを5〜20質量%含有することで、封筒の製袋加工に必要な強度と剛度を得ることができる。20質量%より多いと、地合いが悪くなり、糊付部の波打ちやカールなどの問題を生じる。
配合する針葉樹クラフトパルプのカナダ標準ろ水度(CSF)は400〜600mlに調整されていることが好ましい。針葉樹クラフトパルプのカナダ標準ろ水度が400mlより低いと用紙に高い剛度が得られず、600mlより高いと引裂き強さが低くなる。
また、本発明の封筒用紙は、古紙パルプを含有していることが好ましく、リサイクルという点でその配合率は高いほうが良いが、高過ぎると剛度や強度が不足する。
The envelope paper of the present invention contains 5 to 20% by mass of all-medium softwood kraft pulp.
By containing 5-20% by mass of softwood kraft pulp, it is possible to obtain the strength and rigidity necessary for the envelope bag making process. When it is more than 20% by mass, the texture is deteriorated, and problems such as waving and curling of the glued portion occur.
The Canadian standard freeness (CSF) of the softwood kraft pulp to be blended is preferably adjusted to 400 to 600 ml. If the Canadian standard freeness of softwood kraft pulp is lower than 400 ml, the paper will not have high rigidity, and if it is higher than 600 ml, the tear strength will be low.
Moreover, it is preferable that the envelope paper of the present invention contains waste paper pulp, and the blending ratio is preferably high in terms of recycling, but if it is too high, the rigidity and strength are insufficient.

本発明の封筒用紙に使用する古紙パルプは、上質古紙脱墨パルプとし、その配合率は20〜50質量%とする。上質古紙脱墨パルプは一般的に上質紙や上質コート紙を原料に脱墨処理した古紙パルプであり、古紙の分類としてケント、色上などが使用されたものである。
古紙パルプは、新聞古紙、雑誌古紙、上質古紙等の各種の古紙から製造されるため、NBKP、LBKP等の化学パルプや前記記載の機械パルプの数種類のパルプを含有している。しかし、使用する古紙の種類を一定とすれば、古紙パルプに含まれる針葉樹クラフトパルプの含有率も一定となり、古紙を配合しても、封筒用紙全体に含まれる針葉樹クラフトパルプの質量比率の予測や調整は可能である。上質古紙パルプの繊維組成(質量%)は、針葉樹クラフトパルプ/広葉樹クラフトパルプ/機械パルプ=8/90/2程度である。繊維組成は、JISP8120:1998紙、板紙及びパルプ−繊維組成試験方法により求めることができる。
The waste paper pulp used for the envelope paper of the present invention is high-quality waste paper deinked pulp, and the blending ratio is 20 to 50% by mass. High-quality waste paper deinked pulp is generally waste paper pulp that has been deinked using high-quality paper or high-quality coated paper as the raw material, and Kent, color etc. are used as the classification of waste paper.
Waste paper pulp is produced from various waste papers such as newspaper waste paper, magazine waste paper, and high-quality waste paper, and therefore contains chemical pulps such as NBKP and LBKP and several types of pulps as described above. However, if the type of used paper used is constant, the content of coniferous kraft pulp contained in the used paper pulp will be constant, and even if used paper is blended, the weight ratio of coniferous kraft pulp contained in the entire envelope paper can be predicted. Adjustment is possible. The fiber composition (mass%) of high-quality waste paper pulp is about softwood kraft pulp / hardwood kraft pulp / mechanical pulp = 8/90/2. The fiber composition can be determined by JISP8120: 1998 paper, paperboard and pulp-fiber composition test method.

封筒用紙に含まれる針葉樹クラフトパルプの含有率は、針葉樹クラフトパルプの配合率と上質古紙脱墨パルプの配合率を調整することで、前記範囲とすることができる。使用する上質古紙脱墨パルプは、白色度70〜85%、灰分5〜15%が望ましい。このような上質古紙脱墨パルプを使用することで、封筒用紙の白色度と不透明度を高くすることができ、古紙パルプを配合しても白色度、不透明度が高い封筒用紙を得ることができる。 The content ratio of the softwood kraft pulp contained in the envelope paper can be adjusted to the above range by adjusting the blending ratio of the softwood kraft pulp and the blending ratio of the high-quality waste paper deinked pulp. Desirable quality used paper deinked pulp has a whiteness of 70 to 85% and an ash content of 5 to 15%. By using such high-quality waste paper deinked pulp, the whiteness and opacity of the envelope paper can be increased, and an envelope paper having high whiteness and opacity can be obtained even if wastepaper pulp is blended. .

本発明の封筒用紙には、インキ発色性、インキ着肉性、不透明度、白色度向上を目的に填料を添加する。特に白色度の高い炭酸カルシウムを灰分として8%以上添加し、封筒用紙の灰分を5.0〜15%としている。
炭酸カルシウムの添加率が8%より低いと、白色度が低くなり、不透明度が不足する。炭酸カルシウムの添加率の上限は特になく、灰分が後述するようになれば良いが、通常は20%までである。これより多いと、炭酸カルシウムが、抄紙機の原料系内に蓄積したり、抄紙機のフェルト汚れが発生し、抄紙の操業性が悪くなる。
炭酸カルシウム以外の填料の種類は特に限定されず、一般の印刷用紙に使用されている填料を使用することができる。具体的には、タルク、クレー、シリカ、二酸化チタン等の無機填料やプラスチックピグメント等の有機填料を使用することができる。
本発明の封筒用紙の灰分(JISP8251)は5.0〜15%とするのが好ましい。灰分が5.0%より低いと不透明度や白色度が不足し、15%より高いと剛度が不足する。
Fillers are added to the envelope paper of the present invention for the purpose of improving ink color development, ink fillability, opacity and whiteness. In particular, calcium carbonate having a high whiteness is added in an amount of 8% or more as ash, and the ash content of the envelope paper is set to 5.0 to 15%.
When the addition rate of calcium carbonate is lower than 8%, the whiteness is lowered and the opacity is insufficient. There is no particular upper limit on the addition rate of calcium carbonate, and the ash content may be as described later, but it is usually up to 20%. When the amount is higher than this, calcium carbonate accumulates in the raw material system of the paper machine, or felt stains of the paper machine occur, resulting in poor paper operability.
The type of filler other than calcium carbonate is not particularly limited, and fillers used for general printing paper can be used. Specifically, inorganic fillers such as talc, clay, silica, and titanium dioxide, and organic fillers such as plastic pigments can be used.
The ash content (JISP8251) of the envelope paper of the present invention is preferably 5.0 to 15%. When the ash content is lower than 5.0%, the opacity and whiteness are insufficient, and when the ash content is higher than 15%, the rigidity is insufficient.

そして、炭酸カルシウムとその他の填料を含有させることにより、白色度と不透明度を高くしている。 And whiteness and opacity are made high by containing a calcium carbonate and another filler.

本発明の封筒用紙は、蛍光染料を添加し、蛍光強度が5〜10%となるようにしている。
上質古紙脱墨パルプを使用した場合の蛍光強度がこの範囲であれば、目視白色度が高くなるので好ましい。蛍光染料は内添でも外添でもよく、内添と外添を併用してもよい。
このようにして、白色度(JISP8148)80%以上(好ましくは85%以上)、不透明度(JISP8149)90%以上(好ましくは95%以上)の封筒用紙が得られる。白色度は高いほど印刷効果が高くなる。不透明度が90%以上あれば、封筒の中身の視認が難しくなり、95%以上あれば、封筒の中身が通常の印刷物の場合、ほぼ視認できなくなる。
In the envelope paper of the present invention, a fluorescent dye is added so that the fluorescence intensity is 5 to 10%.
If the fluorescence intensity when high-quality waste paper deinked pulp is used is in this range, the visual whiteness becomes high, which is preferable. The fluorescent dye may be internally added or externally added, and internal and external additives may be used in combination.
In this manner, an envelope paper having whiteness (JISP8148) of 80% or more (preferably 85% or more) and opacity (JISP8149) of 90% or more (preferably 95% or more) is obtained. The higher the whiteness, the higher the printing effect. When the opacity is 90% or more, it is difficult to visually recognize the contents of the envelope.

通常、紙の白色度を上げるには、使用するパルプの漂白を進めてパルプの白色度を上げたり、白色度の高い填料を配合する必要があるが、それぞれ、不透明度低下、強度低下の問題がある。蛍光染料を添加することによって白色度を上げれば、不透明度の低下や強度の低下をまねくことがない。 Usually, in order to increase the whiteness of paper, it is necessary to increase the whiteness of the pulp by increasing the bleaching of the pulp to be used, or to add a filler with a high whiteness. There is. Increasing whiteness by adding a fluorescent dye will not cause a decrease in opacity or strength.

本発明の封筒用紙では、原料パルプに硫酸バンド、サイズ剤、嵩向上剤、紙力増強剤等を添加することができる。サイズ剤としては、ロジン系サイズ剤、アルキルケテンダイマー、アルケニル無水琥珀酸等のサイズ剤が使用できる。紙力増強剤としては、カチオン澱粉、ポリアクリルアミド系樹脂等が使用できる。その他、必要に応じ、湿潤紙力増強剤、スライムコントロール剤、ピッチコントロール剤、消泡剤、染料等の添加剤も使用することができる。 In the envelope paper of the present invention, a sulfuric acid band, a sizing agent, a bulk improver, a paper strength enhancer, and the like can be added to the raw material pulp. As the sizing agent, a sizing agent such as rosin sizing agent, alkyl ketene dimer, alkenyl succinic anhydride can be used. As the paper strength enhancer, cationic starch, polyacrylamide resin and the like can be used. In addition, additives such as a wet paper strength enhancer, a slime control agent, a pitch control agent, an antifoaming agent, and a dye can be used as necessary.

次に本発明の封筒用紙の紙質について、製袋加工適性と自動封入封緘機に対応できる封緘適性の面から、以下のような特性を持つものとしている。 Next, the paper quality of the envelope paper of the present invention has the following characteristics from the viewpoints of suitability for bag making and sealing suitability that can be applied to an automatic sealing machine.

本発明の封筒用紙の坪量は70〜120g/mとされている。
坪量が70g/mより低いと、不透明度が不足し、ダイレクトメール等の個人情報を取り扱う封筒には適さない。坪量が120g/m程度あれば十分な不透明度や剛度を持つ封筒となるが、これより高いとこわさが高くなり過ぎて製袋加工適性が悪くなる場合がある。
本発明の封筒用紙は、ステキヒトサイズ度が15秒以上とされている。
ステキヒトサイズ度は、水溶液系や水分散系の接着剤を使用する場合の接着性に関わってくる。ステキヒトサイズ度が15秒に満たないと、これらの接着剤の用紙への吸収が多くなり、用紙の波打ちが発生したり、接着不良となることがある。
The basis weight of the envelope paper of the present invention is 70 to 120 g / m 2 .
When the basis weight is lower than 70 g / m 2 , the opacity is insufficient and it is not suitable for an envelope handling personal information such as direct mail. If the basis weight is about 120 g / m 2, the envelope will have sufficient opacity and rigidity. However, if the basis weight is higher than this, the stiffness will be too high and the bag-making processability may deteriorate.
The envelope paper of the present invention has a Steecht sizing degree of 15 seconds or more.
Steecht's sizing is related to the adhesiveness when using an aqueous or water-dispersed adhesive. If the Steecht sizing degree is less than 15 seconds, the absorption of these adhesives to the paper increases, and the paper may be wavy or poor adhesion may occur.

本発明の封筒用紙は、平滑度が30〜80秒とされている。平滑度が30秒より低いと、自動封入封緘機で、紙が重なったり、詰りなどによりシワ入りや接着不良を起こす。平滑度が80秒より高いと、摩擦係数が低過ぎて、自動封入封緘機で不揃いのトラブルを起こすことがある。 The envelope paper of the present invention has a smoothness of 30 to 80 seconds. When the smoothness is lower than 30 seconds, the automatic enclosing and sealing machine causes wrinkles and poor adhesion due to paper overlapping or clogging. If the smoothness is higher than 80 seconds, the friction coefficient is too low, and the automatic sealing machine may cause irregular troubles.

本発明の封筒用紙のクラークこわさ縦が70〜240cm/100とされている。クラークこわさ縦が70cm/100より低いと、製袋機や自動封入封緘機での不揃いやシワ入りとなるおそれがあり、240cm/100より高いと、硬すぎて製袋時の折り不良となるおそれがある。 Clark stiffness vertical envelope sheet of the present invention is a 70~240cm 3/100. When the Clark stiffness of the vertical is less than 70cm 3/100, there is a possibility that the uneven and wrinkles filled in the bag-making machine and automatic enclosing and sealing machine, and higher than 240cm 3/100, and the folding failure at the time of the bag-making is too hard There is a risk.

本発明の封筒用紙の吸油度は、40〜100秒とされている。吸油度は、有機溶剤系接着剤や熱溶融型接着剤(ホットメルト)を使用する場合の接着性に関わってくる。吸油度が40秒に満たないと、有機溶剤系接着剤を使用した場合、溶剤成分が用紙の裏に抜け、見栄えが悪くなる。吸油度が100秒を超えるとこれらの接着剤の用紙への吸収が不足して、一度接着しても、接着剤と用紙の間で界面剥離を起こし、剥がれやすくなる。
封筒用紙の吸油度は、使用する填料の種類や填料の添加率、表面処理剤の種類や塗布量、カレンダー処理条件等により、調整することができる。
The oil absorption of the envelope paper of the present invention is 40 to 100 seconds. The oil absorption is related to the adhesiveness when an organic solvent-based adhesive or a hot-melt adhesive (hot melt) is used. When the oil absorption is less than 40 seconds, when an organic solvent-based adhesive is used, the solvent component is lost to the back of the paper, resulting in poor appearance. When the oil absorption exceeds 100 seconds, the absorption of these adhesives to the paper is insufficient, and even if the adhesive is once bonded, the interface peels between the adhesive and the paper and is easily peeled off.
The oil absorption of the envelope paper can be adjusted by the type of filler to be used, the addition rate of the filler, the type and amount of the surface treatment agent, the calendering conditions, and the like.

本発明の封筒用紙では、表面処理剤に接着剤を、パイリングなどの表面強度に纏わるトラブルを回避するために配合する。表面強度を高めるための接着剤としては、澱粉類を含むことが好ましい。 In the envelope paper of the present invention, an adhesive is added to the surface treatment agent in order to avoid troubles related to surface strength such as piling. The adhesive for increasing the surface strength preferably contains starch.

澱粉類は、親水性である繊維との接着能力が高く、塗布量が少ない場合において紙表面から脱落し易い微細繊維なども強力に接着するため好ましい。前記澱粉類としては、酵素変性澱粉、酸化澱粉、エーテル化澱粉、エステル化澱粉、カチオン化澱粉、疎水化澱粉などが例示される。なお、カルボキシメチルセルロース、メチルセルロース、ヒドロキシアルキルセルロースなどの水溶性セルロース化合物、ポリビニルアルコール化合物やポリアクリルアミド類、カゼイン、大豆蛋白、合成蛋白などの蛋白質類やラテックス類などの通常の塗工紙用接着剤を一種類以上併用しても良い。 Starch is preferable because it has a high adhesive ability with hydrophilic fibers and strongly adheres fine fibers that easily fall off the paper surface when the coating amount is small. Examples of the starches include enzyme-modified starch, oxidized starch, etherified starch, esterified starch, cationized starch, and hydrophobic starch. In addition, water-soluble cellulose compounds such as carboxymethyl cellulose, methyl cellulose and hydroxyalkyl cellulose, polyvinyl alcohol compounds, polyacrylamides, proteins such as casein, soy protein, synthetic proteins, and adhesives for ordinary coated paper such as latex One or more types may be used in combination.

本発明においては、良好な印刷作業性と印刷品質を提供する上で、接着剤の塗布量は片面あたり0.20〜1.0g/mとするのが好ましく、より好ましくは0.20〜0.50g/mとする。接着剤の塗布量が規定量より少ないと紙粉などに代表される表面強度に纏わるトラブルが起こるおそれがあり、規定量より多いと不透明度を低下させる傾向がある。 In the present invention, in order to provide good printing workability and printing quality, the coating amount of the adhesive is preferably 0.20 to 1.0 g / m 2 per side, and more preferably 0.20 to 0.20. 0.50 g / m 2 . If the application amount of the adhesive is less than the specified amount, troubles related to the surface strength represented by paper dust and the like may occur, and if it exceeds the specified amount, the opacity tends to be reduced.

表面処理剤を原紙へ塗布するための装置としては、特に限定さないが、例えばツーロールサイズプレス、ブレードメタリングサイズプレス、ロッドメタリングサイズプレス、ゲートロールコーターなどのロールコーター、ベベルタイプやベントタイプのブレードコーター、ロッドコーター、バーコーター、エアーナイフコーター、カーテンコーター、スプレーコーター、グラビアコーターなどの公知公用の装置が使用される。なお、表面処理剤を塗布後の湿潤塗布層を乾燥する方法としては、蒸気乾燥、ガスヒーター乾燥、電気ヒーター乾燥、赤外線ヒーター乾燥などの各種方式が採用できる。 The apparatus for applying the surface treatment agent to the base paper is not particularly limited. Known and publicly used apparatuses such as blade coaters, rod coaters, bar coaters, air knife coaters, curtain coaters, spray coaters, and gravure coaters are used. Various methods such as steam drying, gas heater drying, electric heater drying, and infrared heater drying can be adopted as a method for drying the wet coating layer after the surface treatment agent is applied.

本発明の封筒用紙の製造に際しては、ドライヤーで乾燥後に、カレンダー装置により平滑化処理する。カレンダー装置としては、チルドカレンダー、ソフトカレンダー、グロスカレンダー等の一般に使用されているカレンダー装置が使用できる。目標とする平滑度に応じて、ニップ数やニップ圧、ロール温度、ロール材質、ロール硬度等を設定する。 When the envelope paper of the present invention is manufactured, it is dried by a dryer and then smoothed by a calendar device. As the calendar device, commonly used calendar devices such as a chilled calendar, a soft calendar, and a gloss calendar can be used. The number of nips, nip pressure, roll temperature, roll material, roll hardness, etc. are set according to the target smoothness.

以下、実施例及び比較例により、本発明の効果を具体的に表す。なお、%は特に断りのない限り質量%を表し、添加量は絶乾パルプに対する固形分または有効成分で表す。 Hereinafter, the effects of the present invention will be specifically described by Examples and Comparative Examples. In addition, unless otherwise indicated,% represents the mass%, and the addition amount represents the solid content or the active ingredient with respect to the absolutely dry pulp.

(実施例1)
LBKP45質量部(白色度85%、350mlCSF)、NBKP10質量部(白色度86%、450mlCSF)、上質古紙脱墨パルプ45質量部(白色度79%、350mlCSF、NBKPの含有率8質量%)からなるパルプ分散液に、硫酸バンド3質量%(有姿)、填料として軽質炭酸カルシウム(東洋電化工業株式会社製、商品名:トヨライトTNC−S360)を12質量%添加し、サイズ剤(荒川化学工業株式会社製、商品名:サイズパイン811M)0.5質量%、カチオン澱粉(GSJジャパン製、商品名:ジェルトロン24)0.5質量%、歩留り向上剤(ハイモ社製、商品名:ND260)を対パルプ200ppm添加して抄紙した。表面処理剤として、酸化澱粉(王子コーンスターチ株式会社製、商品名:王子エースA)を塗布量が片面当たり0.50g/m、表面サイズ剤(荒川化学工業株式会社製、商品名:ポリマロンM20)を塗布量が片面当たり0.14g/m、蛍光染料(ケミラジャパン社製、ブランコホアーZ−PS)を塗布量が片面当たり0.10g/mとなるように、表裏同一塗布量でゲートロールコーターを用いて塗布し、乾燥後、ソフトカレンダー処理(線圧10kN/m、温度80℃)し、坪量82.0g/m、水分6.0%の封筒用紙を得た。得られた封筒用紙の評価結果を表1に示す。
Example 1
LBKP 45 parts by weight (whiteness 85%, 350 ml CSF), NBKP 10 parts by weight (whiteness 86%, 450 ml CSF), fine waste paper deinked pulp 45 parts by weight (whiteness 79%, 350 ml CSF, NBKP content 8% by weight) To the pulp dispersion, 3% by mass of sulfuric acid band (solid), 12% by mass of light calcium carbonate (manufactured by Toyo Denka Kogyo Co., Ltd., trade name: Toyolite TNC-S360) as a filler was added, and the sizing agent (Arakawa Chemical Industries Ltd.) Made by company, trade name: size pine 811M) 0.5% by weight, cationic starch (manufactured by GSJ Japan, trade name: Geltron 24) 0.5% by weight, yield improver (made by Hymo, trade name: ND260) Paper was made by adding 200 ppm to pulp. As a surface treatment agent, an oxidized starch (manufactured by Oji Cornstarch Co., Ltd., trade name: Oji Ace A) is applied in an amount of 0.50 g / m 2 per side, and a surface sizing agent (Arakawa Chemical Industries, Ltd., trade name: Polymaron M20). ) Coating amount is 0.14 g / m 2 per side and fluorescent dye (Chemilla Japan, Blanco Hoar Z-PS) is applied at the same front and back so that the coating amount is 0.10 g / m 2 per side. Then, it was coated using a gate roll coater, dried, and then soft calendered (linear pressure 10 kN / m, temperature 80 ° C.) to obtain an envelope paper having a basis weight of 82.0 g / m 2 and a moisture content of 6.0%. Table 1 shows the evaluation results of the obtained envelope paper.

(実施例2)
LBKP45質量部、NBKP5質量部、上質古紙脱墨パルプ50質量部とし、填料として軽質炭酸カルシウムを8質量%添加した以外は実施例1と同様に封筒用紙を得た。
(実施例3)
LBKP65質量部、NBKP15質量部、上質古紙脱墨パルプ20質量部とし、填料として軽質炭酸カルシウムを18質量%添加した以外は実施例1と同様に封筒用紙を得た。
(実施例4)
LBKP45質量部、NBKP10質量部、上質古紙脱墨パルプ45質量部とし、填料として軽質炭酸カルシウムを12質量%添加し、表面処理剤として、酸化澱粉を塗布量が片面当たり0.50g/m、表面サイズ剤を塗布量が片面当たり0.14g/m、蛍光染料を塗布量が片面当たり0.15g/mとなるように、表裏同一塗布量でゲートロールコーターを用いて塗布、乾燥した以外は実施例1と同様に封筒用紙を得た。
(実施例5)
填料として軽質炭酸カルシウムを14質量%添加し、表面処理剤として、酸化澱粉を塗布量が片面当たり0.50g/m、表面サイズ剤を塗布量が片面当たり0.14g/m、蛍光染料を塗布量が片面当たり0.08g/mとなるように、表裏同一塗布量でゲートロールコーターを用いて塗布、乾燥したことと、坪量70.0g/mとしたこと以外は実施例3と同様に封筒用紙を得た。
(実施例6)
填料として軽質炭酸カルシウムを8質量%添加したことと、坪量を100g/mとしたこと以外は実施例1と同様に封筒用紙を得た。
(実施例7)
填料として軽質炭酸カルシウムを8質量%添加したことと、坪量を120g/mとしたこと以外は実施例1と同様に封筒用紙を得た。
(Example 2)
An envelope paper was obtained in the same manner as in Example 1 except that 45 parts by mass of LBKP, 5 parts by mass of NBKP, and 50 parts by mass of fine waste paper deinked pulp were added and 8% by mass of light calcium carbonate was added as a filler.
(Example 3)
An envelope paper was obtained in the same manner as in Example 1 except that 65 parts by mass of LBKP, 15 parts by mass of NBKP, 20 parts by mass of high-quality waste paper deinked pulp were added, and 18% by mass of light calcium carbonate was added as a filler.
Example 4
LBKP 45 parts by weight, NBKP 10 parts by weight, fine waste paper deinked pulp 45 parts by weight, light calcium carbonate as a filler is added 12% by weight, as a surface treatment agent, the applied amount of oxidized starch is 0.50 g / m 2 per side, The surface sizing agent was applied using a gate roll coater at the same coating amount on both sides so that the coating amount was 0.14 g / m 2 per side and the fluorescent dye was 0.15 g / m 2 per side. Except for the above, an envelope paper was obtained in the same manner as in Example 1.
(Example 5)
14% by weight of light calcium carbonate is added as a filler, oxidized starch is applied as a surface treatment agent at a coating amount of 0.50 g / m 2 per side, surface sizing agent is applied at a rate of 0.14 g / m 2 per side, fluorescent dye Example except that the coating amount was 0.08 g / m 2 per side and the gate roll coater was applied and dried at the same front and back coating amount, and the basis weight was 70.0 g / m 2. An envelope paper was obtained in the same manner as in No. 3.
(Example 6)
An envelope paper was obtained in the same manner as in Example 1 except that 8% by mass of light calcium carbonate was added as a filler and the basis weight was 100 g / m 2 .
(Example 7)
An envelope paper was obtained in the same manner as in Example 1 except that 8% by mass of light calcium carbonate was added as a filler and the basis weight was 120 g / m 2 .

(比較例1)
LBKP35質量部、NBKP20質量部、上質古紙脱墨パルプ45質量部とした以外は実施例1と同様に封筒用紙を得た。
(比較例2)
LBKP75質量部、NBKP10質量部、上質古紙脱墨パルプ15質量部とし、填料として軽質炭酸カルシウムを7質量%添加し、蛍光染料を塗布しなかったこと以外は実施例1と同様に封筒用紙を得た。
(比較例3)
表面処理剤として、酸化澱粉を塗布量が片面当たり0.50g/m、表面サイズ剤を塗布量が片面当たり0.14g/m、蛍光染料を塗布量が片面当たり0.05g/mとなるように、表裏同一塗布量でゲートロールコーターを用いて塗布、乾燥した以外は実施例2と同様に封筒用紙を得た。
(比較例4)
填料として軽質炭酸カルシウムを23質量%添加し、ソフトカレンダーの処理条件を線圧30kN/m、温度80℃としたこと以外は実施例1と同様に封筒用紙を得た。
(比較例5)
LBKP60質量部、上質古紙脱墨パルプ40質量部とした以外は実施例5と同様に封筒用紙を得た。
(比較例6)
坪量を62g/mとしたこと以外は実施例5と同様に封筒用紙を得た。
(比較例7)
坪量を125g/mとしたこと以外は実施例7と同様に封筒用紙を得た。
(比較例8)
坪量を120g/mとし、ソフトカレンダーの処理条件を線圧5kN/m、温度80℃としたこと以外は、比較例2と同様に封筒用紙を得た。得られた封筒用紙の評価結果を表1に示す。
(Comparative Example 1)
An envelope paper was obtained in the same manner as in Example 1 except that 35 parts by mass of LBKP, 20 parts by mass of NBKP, and 45 parts by mass of high-quality waste paper deinked pulp were used.
(Comparative Example 2)
Envelope paper is obtained in the same manner as in Example 1 except that 75 parts by weight of LBKP, 10 parts by weight of NBKP, 15 parts by weight of fine waste paper deinked pulp, 7% by weight of light calcium carbonate is added as a filler, and no fluorescent dye is applied. It was.
(Comparative Example 3)
As a surface treatment agent, per side 0.50 g / m 2 of oxidized starch coating amount, surface sizing agent coating amount per side 0.14 g / m 2, a fluorescent dye coating amount per side 0.05 g / m 2 Thus, envelope paper was obtained in the same manner as in Example 2 except that it was applied and dried with a gate roll coater at the same application amount on the front and back sides.
(Comparative Example 4)
An envelope paper was obtained in the same manner as in Example 1 except that 23% by mass of light calcium carbonate was added as a filler, and the soft calender treatment conditions were a linear pressure of 30 kN / m and a temperature of 80 ° C.
(Comparative Example 5)
An envelope paper was obtained in the same manner as in Example 5 except that 60 parts by mass of LBKP and 40 parts by mass of high-quality waste paper deinked pulp were used.
(Comparative Example 6)
An envelope paper was obtained in the same manner as in Example 5 except that the basis weight was 62 g / m 2 .
(Comparative Example 7)
An envelope paper was obtained in the same manner as in Example 7 except that the basis weight was 125 g / m 2 .
(Comparative Example 8)
An envelope paper was obtained in the same manner as in Comparative Example 2, except that the basis weight was 120 g / m 2 , the soft calender treatment conditions were a linear pressure of 5 kN / m, and a temperature of 80 ° C. Table 1 shows the evaluation results of the obtained envelope paper.

なお、試験方法と評価方法は次のとおりである。
(坪量)JISP8124:1998紙及び板紙−坪量測定方法
(繊維組成)JISP8120:1998紙、板紙及びパルプ−繊維組成試験方法に準拠した。各繊維の重み係数は、NBKP=1.0、LBKP=0.26、MP=1.3とおいた。
(灰分)JISP8251:2003紙、板紙及びパルプ−灰分試験方法−525℃燃焼法
(白色度)JISP8148:2001紙、板紙及びパルプ−ISO白色度(拡散青色光反射率)の測定方法
(蛍光強度)日本電色工業株式会社製の分光式白色差計PF−10用い、パルスキセノンランプを光源として使用し、JIS P8148(2001年)に従って測定する白色度において、光路に420nmカットオフフィルターを挿入しない場合から同フィルターを挿入した場合の白色度を引いた値を蛍光強度とした。
(不透明度)JISP8149:2000紙及び板紙−不透明度試験方法(紙の裏当て)−拡散照射法
(ステキヒトサイズ度)JISP8122:2004紙及び板紙−サイズ度試験方法−ステキヒト法
(平滑度)JISP8119:1998紙及び板紙−ベック平滑度試験機による平滑度試験方法
(クラークこわさ)JISP8143:2009紙−こわさ試験方法−クラークこわさ試験機法
(吸油度)旧JISP3001:1995新聞巻取紙に準じて測定した。
(評価)製袋加工機(冨士製袋機工業株式会社:FFDW−3/G−1洋封製袋機)を用い、製袋速度を350枚/分に設定して、封筒用紙を洋封筒に加工した。口糊は、アラビア口糊(再湿糊)を塗布、乾燥した。製袋後、自動封入封緘機にかけた。
製袋機での製袋加工適性と、自動封入封緘機での封緘適性を次の基準で評価した。
(製袋加工適性)
○:折部分、紙揃え部分で不揃いがなく、設定の速度で加工できた。
×:折部分、紙揃え部分で不揃いやシワが発生し、製袋速度を落とさなければならなかった。
(封緘適性)
○:口糊が所定の位置あり着し、フラップが十分に接着していた。
×:一部にフラップの接着不良が見られた。
The test method and evaluation method are as follows.
(Basis weight) JISP 8124: 1998 paper and paperboard-basis weight measuring method (fiber composition) JISP8120: 1998 paper, paperboard and pulp-fiber-fiber composition test method. The weighting coefficient of each fiber was set as NBKP = 1.0, LBKP = 0.26, and MP = 1.3.
(Ash content) JISP8251: 2003 paper, paperboard and pulp-Ash content test method-525 ° C combustion method (whiteness) JISP8148: 2001 paper, paperboard and pulp-ISO whiteness (diffuse blue light reflectance) measurement method (fluorescence intensity) When using a spectroscopic white difference meter PF-10 manufactured by Nippon Denshoku Industries Co., Ltd., using a pulsed xenon lamp as the light source, and not inserting a 420 nm cut-off filter in the optical path at whiteness measured according to JIS P8148 (2001) The value obtained by subtracting the whiteness when the same filter was inserted was used as the fluorescence intensity.
(Opacity) JISP8149: 2000 paper and paperboard-Opacity test method (backing of paper) -Diffusion irradiation method (Stichtite sizing degree) JISP8122: 2004 Paper and paperboard-Sizing degree test method-Stichtman method (Smoothness) JISP8119 : 1998 paper and paperboard-Smoothness test method (Clark stiffness) by Beck smoothness tester JISP8143: 2009 paper-stiffness test method-Clark stiffness tester method (oil absorption) Measured according to old JISP3001: 1995 newspaper web.
(Evaluation) Using a bag making machine (Fuji Bag Making Industry Co., Ltd .: FFDW-3 / G-1 Western sealed bag making machine), setting the bag making speed to 350 sheets / min, It was processed into. As the mouth paste, Arabic mouth paste (rewetting paste) was applied and dried. After bag making, it was put in an automatic sealing machine.
The suitability for bag making with a bag making machine and the sealing suitability with an automatic sealing and sealing machine were evaluated according to the following criteria.
(Applicability to bag making)
◯: There was no unevenness in the folded part and the paper alignment part, and processing was possible at the set speed.
X: Unevenness and wrinkles occurred at the folded part and the paper alignment part, and the bag making speed had to be reduced.
(Sealability)
○: The mouth paste was attached at a predetermined position, and the flap was sufficiently adhered.
X: Adhesion failure of the flap was observed in part.

Figure 2012219415
Figure 2012219415

Figure 2012219415
Figure 2012219415

表1に示したように、本発明の実施例1〜7では、いずれも白色度、不透明度が高く、製袋加工適性、封緘適性の評価がともに良好であることがわかる。
比較例1は、NBKPの含有率が24質量%と多く、地合いが悪くなり糊付部の波打ちが発生したため、封緘適性の評価が悪くなっている。
比較例2は、炭酸カルシウムの添加率が7%と低いため灰分も4.7%と低く、蛍光染料の添加がないこともあり、白色度、不透明度が低くなっている。
比較例3は、蛍光染料の塗布量が少ないので蛍光強度が3%と低くなっており、白色度が不足している。
比較例4は、炭酸カルシウムの添加量が23質量%で灰分が18%と高いので、クラークこわさ縦が68cm/100と低く、製袋加工適性の評価が劣っている。また、平滑度表が84秒、裏が82秒と高いので、自動封緘機で不揃いが生じた。
比較例5は、NBKPの含有率が3質量%と少なく、クラ−クこわさ縦が66cm/100と低くなっており、製袋加工適性、封緘適性の評価が劣っている。
比較例6は、坪量が62.0g/mと低いため、不透明度が89.2%と低く、こわさ縦が64cm/100と低くなっており、製袋加工適性の評価が悪くなっている。また、ステキヒトサイズ度が12秒と低いので、封緘適性の評価が悪くなっている。
比較例7は、坪量が125.0g/mと高く、こわさ縦が245cm/100と高くなっており、製袋加工適性の評価が悪くなっている。
比較例8は、炭酸カルシウムの添加率が7%と低いため灰分も4.8%と低く、蛍光染料の添加がないこともあり、白色度が低くなっている。また、平滑度表が28秒、裏が27秒と低いので、自動封緘機で詰まりが生じた。
As shown in Table 1, in Examples 1 to 7 of the present invention, both the whiteness and the opacity are high, and it can be seen that both the bag-making process suitability and the sealing suitability evaluation are good.
In Comparative Example 1, the content of NBKP is as high as 24% by mass, the texture is poor, and the undulation of the glued portion is generated.
In Comparative Example 2, since the addition rate of calcium carbonate is as low as 7%, the ash content is as low as 4.7%, the fluorescent dye may not be added, and the whiteness and opacity are low.
In Comparative Example 3, since the amount of fluorescent dye applied is small, the fluorescence intensity is as low as 3%, and the whiteness is insufficient.
Comparative Example 4, since the amount of calcium carbonate 18% and higher ash content 23 wt%, Clark stiffness ordinate as low as 68cm 3/100, evaluation of the bag-making processability is inferior. Moreover, since the smoothness table was as high as 84 seconds and the back was as high as 82 seconds, irregularities occurred in the automatic sealing machine.
Comparative Example 5, the content of NBKP is the least 3 wt%, Kura - click stiffness ordinate are as low as 66cm 3/100, bag-making processability, the evaluation of sealing suitability is inferior.
Comparative Example 6, since the basis weight as low as 62.0 g / m 2, opacity is low 89.2% and stiffness ordinate is as low as 64cm 3/100, evaluation of the bag-making processability becomes poor ing. In addition, since the steecht degree is as low as 12 seconds, the evaluation of sealing suitability is worse.
Comparative Example 7 had a basis weight as high as 125.0 g / m 2, and stiffness ordinate is as high as 245 cm 3/100, evaluation of the bag-making processability is deteriorated.
In Comparative Example 8, since the addition rate of calcium carbonate is as low as 7%, the ash content is as low as 4.8%, the fluorescent dye may not be added, and the whiteness is low. Further, since the smoothness table was as low as 28 seconds and the back surface was as low as 27 seconds, clogging occurred in the automatic sealing machine.

本発明の用紙は、高速化された自動封入封緘機で使用される封筒用紙に適しているほか、各種の加工用の用紙としても使用できる。 The paper of the present invention is suitable as an envelope paper used in a high-speed automatic enclosing and sealing machine, and can also be used as a paper for various types of processing.

Claims (2)

以下の(1)から(6)の条件を満たす封筒用紙。
(1)上質古紙パルプが20〜50質量%配合されている。
(2)NBKPを5〜20質量%含む。
(3)炭酸カルシウム8%以上添加し、灰分5.0〜15%
(4)蛍光染料を含有し、蛍光強度5〜10%
(5)白色度80%以上
(6)不透明度90%以上
Envelope paper satisfying the following conditions (1) to (6).
(1) 20-50 mass% of high-quality waste paper pulp is blended.
(2) NBKP is contained in 5 to 20% by mass.
(3) Add calcium carbonate 8% or more, ash 5.0-15%
(4) Contains a fluorescent dye and has a fluorescence intensity of 5 to 10%
(5) Whiteness 80% or more (6) Opacity 90% or more
請求項1に記載の封筒用紙であって、以下の(7)〜(11)の条件を満たす封筒用紙。
(7)坪量70〜120g/m
(8)ステキヒトサイズ度15秒以上
(9)平滑度30〜80秒
(10)クラークこわさ縦70〜240cm/100
(11)吸油度40〜100秒
The envelope paper according to claim 1, wherein the envelope paper satisfies the following conditions (7) to (11).
(7) Basis weight 70-120 g / m 2
(8) Stockigt sizing degree of 15 seconds or more (9) smoothness 30-80 seconds (10) Clark stiffness longitudinal 70~240cm 3/100
(11) Oil absorption 40 to 100 seconds
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014055372A (en) * 2012-09-12 2014-03-27 Nippon Paper Industries Co Ltd Kraft paper

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014055372A (en) * 2012-09-12 2014-03-27 Nippon Paper Industries Co Ltd Kraft paper

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