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JP3728845B2 - Glassine paper for release paper base sheet - Google Patents
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JP3728845B2 - Glassine paper for release paper base sheet - Google Patents

Glassine paper for release paper base sheet Download PDF

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Publication number
JP3728845B2
JP3728845B2 JP00147897A JP147897A JP3728845B2 JP 3728845 B2 JP3728845 B2 JP 3728845B2 JP 00147897 A JP00147897 A JP 00147897A JP 147897 A JP147897 A JP 147897A JP 3728845 B2 JP3728845 B2 JP 3728845B2
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Japan
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paper
adhesive
release
glassine
pigment
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JP00147897A
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JPH10204795A (en
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一郎 松岡
真之 山本
学 山本
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New Oji Paper Co Ltd
Oji Holdings Corp
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Oji Holdings Corp
Oji Paper Co Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は、グラシン紙に関するものであり、詳しくは粘着紙に使用する剥離紙の基材に適したグラシン紙に関するものである。更に詳しくは、透過式位置検出機を有するラベラーでの位置検知に問題がなく、さらに原紙上にポリエチレンラミネートすることなく離型剤を塗布することができ、しかも古紙パルプとして再利用が可能で、糊残りのない剥離紙を提供できるグラシン紙に関するものである。
【0002】
【従来の技術】
粘着紙はラベル、シール、ステッカー、ワッペン等として、商業用、事務用、家庭用等広範囲な用途に使用されている。この粘着紙は一般的に表面基材、粘着剤、剥離紙の順に積層して構成したものである。表面基材は紙、フィルム、金属フォイル等が用いられ、剥離紙はグラシン紙のような高密度紙、クレーコート紙、ポリエチレンラミネート紙等の剥離紙原紙にシリコーン化合物や弗素化合物等の剥離剤を塗布したものが使用されている。また、粘着剤には溶剤型粘着剤、エマルジョン型粘着剤、ホットメルト型粘着剤等が使用される。
【0003】
剥離紙としては、ポリエチレンラミネートタイプ、グラシンタイプ、クレーコートタイプ等が知られており、これらの木材パルプを主原料とする上質紙、片艶紙及びクラフト紙等の表面にシリコーン樹脂等の離型剤溶液の浸透を極力抑制して離型剤の性能を最大限に発揮させる目的で、ポリエチレン樹脂フィルム層を形成させたものが一般的に用いられている。しかし、上記のポリエチレンラミネートタイプは、このポリエチレン樹脂が強固な連続皮膜を形成しかつそれが水に不溶なためこの基材を再度回収し、製紙工程で再生利用することが不可能であり、これが今日産業廃棄物処理上の大きな問題となっている。
【0004】
そのため、特公平1−35959号公報や特開平4−23876号公報には、直接離型剤溶液を塗布して得られる剥離紙のための基材として、原紙表面に無機顔料及び有機接着剤を主成分とする塗料を塗被して下塗り層を形成するクレーコートタイプ基材が開示されている。このような基材においては、原紙中の微小な空隙を下塗り層が被覆し、これを目止めする効果は認められている。しかし剥離紙基材として上質紙やクラフト紙を用いるため、光透過性に乏しく、透過式の位置検出機を有するラベラーでの位置検知に問題を生じる。
【0005】
グラシンタイプは高度な叩解処理をした化学パルプを原料として抄造し、さらにスーパーカレンダー等の仕上げ設備で緻密化して得たグラシン紙に、シリコーン等の離型剤を設けたものである。グラシンタイプの剥離紙は光透過性に優れるので、透過式の位置検出機を有するラベラーにも適用できる長所を有する。また、比較的紙厚の薄い剥離紙となるため所要の巻き取り径やケースに対して収用量を多面積にできる特徴を有している。
【0006】
剥離紙基材シートとしてのグラシン紙は、剥離剤の基材シートへの浸透を防ぐため、原紙に水溶性高分子を主成分とする塗被組成物を塗布する。塗工方式としては、グラシン紙表面にバ−塗工やブレ−ド塗工に代表されるかきとり方式と、サイズプレスやゲートロールに代表されるロ−ルコ−タ−が挙げられる。かきとり方式を用いると基材シ−トへの浸透を防ぐことが可能となり、バリヤ−性の良好なグラシン紙を得ることができる。
【0007】
しかしながら、グラシン紙はその透明性を利用して、光電管装置によって位置検出を行うことに有効に利用されており、上記のかきとり方式では塗被組成物が原紙上に成膜し、基材内部へ充填されないため十分な透明性が得られず、光電管による位置検出が困難となる問題がある。
【0008】
一方サイズプレスやゲ−トロ−ル方式で、両面あるいは片面に塗工したグラシン紙は塗被組成物が基材シ−ト内部まで充填され、光の散乱が少なくなるため光透過性に優れる。しかし、逆にこの塗工方式の場合、塗被組成物が基材シート内部に充填されてしまうため多量の塗被組成物が必要となり、その場合再生紙の原料としては、離解の際に容易に水に再分散させることができない。しかも剥離剤の浸透の抑制や、剥離剤に対する基材シート表面のカバーリング(被覆性)が不十分であった。
【0009】
このような状態で基材シートおよび剥離剤層で構成される剥離紙に粘着剤を塗工した場合、粘着剤が剥離剤層のピンホールや凹部に入り込む。その状態で粘着シートに仕上げ、次に粘着剤の付着した表面基材を剥離剤層から剥離すると、剥離紙上に粘着剤が残る現象(以後、糊残りと呼ぶ)が見られる。
【0010】
この糊残り現象は粘着シートをフォーム印刷やシール印刷加工に供する過程で、印刷、ダイカット(打ち抜き)、粕取り等をするときに、剥離剤層表面に当たるガイドロール等に粘着剤が付着し、紙送り不良や印刷ずれ等のトラブルを起こし、作業性や品質面に極めて重大な障害となる。また、オートラベラーやハンドラベラー等でプリントやラベリングを行う工程でも、同様に紙送り不良や印字ずれ等、剥離剤層表面の糊残りが問題となる。また、剥離力も重くなる傾向にある。この問題を改善するには、基材シートとなるグラシン紙のバリヤー性をさらに改善することが重要である。
【0011】
【発明が解決しようとする課題】
従って、本発明の目的は、透過式位置検出機を有するラベラーでの位置検知に問題がなく、さらに原紙上にポリエチレンラミネートすることなく離型剤を塗布することができ、糊残りを解消して印刷加工やラベリング工程での作業性が改善され、しかも古紙パルプとして再利用が可能な剥離紙を提供することができるグラシン紙に関する。
【0012】
【課題を解決するための手段】
本発明者等は、かかる現状に鑑み鋭意研究した結果、グラシン紙の下塗り層を、粒子径が0.4μm以下の顔料と水溶性高分子を主成分として構成することにより、本発明の目的を達成できることを見出し、本発明を完成するに至った。
【0013】
本発明者等は、研究を行った結果、高度な叩解処理をした化学パルプを原料とし、ポリビニルアルコール系樹脂水溶液を原紙表面に塗布し、さらにスーパーカレンダー等で緻密化したグラシン紙では、ポリエチレンラミネートタイプに匹敵する剥離性能を得ることができないこと、また、クレーコートタイプでは離型剤溶液の浸透を抑制するバリヤー性は得られるが、透明性に乏しく透過式位置検出機を有するラベラーでの位置検知には不適当であることを知った。
【0014】
本発明は、十分なバリヤー性と、透過式の位置検出機での位置検知に必要な透明性を両立させる剥離紙とするグラシン紙の下塗り層の主成分が、粒子径が0.4μm以下の顔料と水溶性高分子からなることを特徴とするグラシン紙である。
【0015】
また、本発明は、原紙の片面あるいは両面に、下塗り層を設け、加圧処理して透明化させるグラシン紙において、該下塗り層が、粒子径が0.4μm以下の顔料と水溶性高分子を主成分とし、該顔料100重量部に対して水溶性高分子が30〜500重量部であることを特徴とする剥離紙用グラシン紙である。さらに本発明は、該下塗り層の塗工量が、固形分で片面当たり0.3〜3.0g/m2であることを特徴とする剥離紙用グラシン紙である。
【0016】
【発明の実施の形態】
本発明の剥離紙用グラシン紙は、下塗り層の主成分が、株式会社日科機製:COULTER model N4SD SUB−MICRON PARTICLEANALYZERによる球相当径で現した粒子径が0.4μm以下の顔料と水溶性高分子を主成分とすることが特徴である。本発明における下塗り層中の顔料の粒子径は0.4μm以下であることが必要である。顔料の粒子径が0.4μmを超える部分は、篩等の手段で除去する。このようにすることで人間の目に見える可視光線の波長領域つまり400nm〜700nmより顔料の粒子径が短くなり、見た目は透明となる。また、透過式位置検出機を有するラベラーの光電管検知波長領域は機種によって異なるが、おおよそ800nm〜1000nm付近である。それに対し、通常使用される顔料の粒子径は1〜3μmのため顔料の影響を受け剥離紙が不透明となり、ラベラーの光電管が光を検出することができず透過式位置検出機を有するラベラ−での使用はできない。
【0017】
本発明のグラシン紙は顔料の粒子径を0.4μm以下とすることにより、顔料がラベラーの光電管の波長より短い粒子となり、光電管の光を通すことが可能となり透過式の位置検出機の使用が可能となる。これを確保するため、塗工後のグラシン紙の米坪は、概ね20〜100g/m2 の範囲とすることが好ましい。
【0018】
本発明者等は、糊残りに関して鋭意検討した結果、糊残りは従来のグラシン紙のように、水溶性高分子のみをバリヤー剤として使用している場合に起こる現象であり、顔料と水溶性高分子を主成分とした場合は起こらないことを見いだした。
これは溶剤に対するバリヤー性が、溶剤の裏面への抜け具合でみる、ピンホールと、バリヤー層へのしみ込み度合いをみる浸透に分けられ、糊残りはピンホールと関係することを見いだした。すなわちピンホールが良好な場合、糊残りも良好となる。
【0019】
通常バリヤー性は、水溶性高分子のようなバインダー成分が多いと、浸透は少なくなり良くなるが、ピンホールは良好とは言えなかった。これは特にグラシン紙のようにサイズプレスを使用した場合顕著である。本発明では粒子径を規定した顔料を加えることにより、ピンホールがなく、浸透防止能も良好なバリヤー性を有するグラシン紙が得られることを見いだし、この結果、粘着シートとして使用した場合の糊残り現象が極めて少なく、ラベラーでの位置検知に問題がなく、さらに原紙上にポリエチレンラミネートすることなく離型剤を塗布することができ、しかも古紙パルプとして再利用が可能な剥離紙を提供することができるグラシン紙が得られた。
【0020】
一般にグラシン紙は、抄紙原料として針葉樹ケミカルパルプを主配合とし、強叩解して酸性ないし中性で抄紙し、スーパーカレンダー処理して仕上げられる。パルプの具体例としては、例えばスプルースやヘムロック等の針葉樹材からなるケミカルパルプが最適であるが、それ以外に広葉樹材からなるケミカルパルプや、メカニカルパルプ、古紙、合成パルプ等を混合配合したものも適宜使用される。
【0021】
また、抄紙原料には各種の助剤、例えばサイズ剤、紙力増強剤、歩留り向上剤、染料等の抄紙用薬品が必要に応じて添加される。パルプの叩解度としてカナディアン・スタンダード・フリーネスで150ml以下に強叩解すると耐油性や透明性は向上する。しかし、抄紙性や湿度寸法安定性に問題が起こり易くなるため、中叩解(200〜300ml)程度にとどめておき、不足分をサイズプレス等による薬品添加でグラシン紙に要望される品質特性を補強する方法が採られている。
【0022】
本発明における水溶性高分子としては例えば、酸化澱粉、陽性澱粉等の澱粉類、カルボキシメチルセルロース、ポリビニルアルコール等が挙げられる。特にポリビニルアルコールはバリヤー性に優れるため好ましい。ポリビニルアルコールはけん化度、重合度を適宜選択して使用するが、例えばカルボキシル基変性、アセトアセチル基変性等種々の変性ポリビニルアルコールも効果的に使用できる。また使用する部数としては顔料100重量部に対して30〜500重量部が好ましく、30重量部未満だと溶剤に対するピンホ−ル防止効果は高いが、浸透防止効果に乏しい。また500重量部を越えると浸透防止効果は発揮されるが、ピンホ−ル防止の効果が低い。
【0023】
また、顔料としては粒子径が0.4μm以下ならいずれも使用可能であり、例えば、コロイダルシリカ、カオリン、クレー、水酸化アルミニウム、重質炭酸カルシウム、軽質炭酸カルシウム、サチンホワイト、タルク、プラスチックピグメント等の顔料から適宜選択して使用される。もちろん二種以上の顔料の併用も可能である。粒子径が0.4μm以下の顔料を購入することが望ましいが、ばあいによっては、購入したものを篩等で分級したり、あるいは乾式、もしくは湿式粉砕後に分級して用いることができる。分級は他の公知の手段も採用できる。
【0024】
また本発明の目的を損なわない限り、潤滑剤を使用することができ、例えば、炭化水素系、脂肪酸系、脂肪酸アミド系、エステル系、アルコール系、金属石鹸等が使用される。具体例としては、炭化水素系では流動パラフィン、天然パラフィン、マイクロワックス、ポリエチレンワックス等、脂肪酸系ではステアリン酸、ラウリン酸、脂肪酸アミド系ではステアリン酸アミド、パルミチン酸アミド、メチレンビスステアロアミド、エチレンビスステアロアミド等、エステル系ではブチルステアレート、硬化ヒマシ油、エチレングリコールモノステアレート等、アルコール系ではセチルアルコール、ステアリルアルコール等、金属石鹸類としてはステアリン酸鉛、ステアリン酸亜鉛、ステアリン酸カルシウム等が例示される。
【0025】
さらに本発明の目的を損なわない限り、必要に応じて、例えば、消泡剤、着色剤、流動変性剤、耐水化剤、耐油化剤、硬化剤等の各種助剤が適宜配合され、二種以上の助剤の併用も可能である。
【0026】
本発明において、グラシン原紙上に塗被組成物を塗工する場合の塗工量は、固形分で片面当たり0.3〜3.0g/m2 、より好ましくは0.8〜2.0g/m2 程度で調整される。因みに0.3g/m2 未満の場合は、ピンホールの解消やバリヤー性の付与効果が不十分となる。一方、3.0g/m2 を越えると所望の効果が飽和しそれ以上は経済性、塗工面で負担が掛かり過ぎ好ましくない。
【0027】
本発明で使用されるスーパーカレンダーとしては、少なくとも1本の金属ロールの表面温度が80〜200℃の温度範囲に加熱されているニップ部に、100kg/cm以上の加圧線圧を付加できる装置であれば適宜採用できる。例えば、ベルマチック社製のマグナパワーカレンダー、2段式カレンダー、および多段式カレンダー等が挙げられる。因みに、80℃未満ではグラシン紙として所望される透明性や平滑性を得ることができない。他方200℃以上では金属ロールへの負担が大きくなり好ましくない。また100kg/cm未満では、グラシン紙として所望される透明性や平滑性を得ることができない。
【0028】
なおグラシン紙の緊度は1.00〜1.25g/cm3、より好ましくは1.05〜1.20g/cm3程度であり、通常の上質紙よりかなり高い値を示している。因みに1.00g/cm3未満では、グラシン紙として所望される透明性や平滑性を得ることができない。そのため剥離剤を塗工したときに剥離剤のカバーリングが悪くなり剥離紙上にピンホール等が生じやすい。なお、剥離剤を多量にすればこの欠点は解消できるが、多量の剥離剤を使用することは経済性の面で問題である。一方、1.25g/cm3を越えると繊維間の空隙が小さくなり、多湿雰囲気下に放置すると水分が繊維内に吸収され、繊維の膨張による繊維間の歪みを吸収できなくなり、カールや寸法変化が発生し剥離剤や粘着剤の塗工時、さらに印刷加工時やラベリング時等において加工適性や作業性が低下し好ましくない。
【0029】
本発明の剥離紙は、上記のようにして得られた塗被紙に、直接離型剤を塗布し乾燥して製造される。離型剤としてはシリコーン樹脂剥離剤が好ましく使用され、シリコーン樹脂剥離剤としては,溶剤系シリコーン樹脂や紫外線硬化型、電子線硬化型等の無溶剤系シリコーン樹脂が適宜選択して使用され、常法に従って塗工される。また、シリコーン樹脂の塗布量は、古紙再生パルプとして再利用することを考慮すると、乾燥重量で0.3〜3.0g/m2 程度の範囲となるように調節するのが望ましい。0.3g/m2 未満では所望の剥離力が得られず、3.0g/m2 を越えると効果が飽和し経済的にも好ましくない。
【0030】
さらに離型剤層を形成する塗布装置としては、例えばロールコーター、バーコーター、グラビアコーター等の一般離型剤塗布用の各種コーターあるいは印刷機等が適宜使用される。
【0031】
なお、本発明の剥離紙を使用して粘着紙とする方法は、常法に従って、例えば天然ゴム、スチレン−ブタジエン共重合体、スチレン−イソプレンブロック共重合体、再生ゴム、合成ゴム等のゴム系、アクリル系、シリコーン系等の粘着剤が適宜使用される。これらの粘着剤は溶剤系、水性エマルジョン系、ホットメルト系、液状硬化型等の形態で、例えばナイフコーター、ロールコーター、ダイコーター、グラビアコーター、スクリーン印刷等によって塗布される。この場合の塗工量は、乾燥重量で10〜40g/m2 、より好ましくは15〜25g/m2 程度の範囲で調節される。因みに10g/m2 未満では粘着剤層としての作用効果に乏しく、40g/m2 を越えるとその効果が飽和し、経済的にも好ましくない。
【0032】
なお、表面基材としては例えば、キャストコーテッド紙、アート紙、コート紙、上質紙、感熱紙、合成紙、蒸着紙、布、不織布、金属ホイル、各種高分子フィルム等があり、その用途、目的に応じて適宜使用することができる。
【0033】
【実施例】
以下に実施例を示して本発明をより具体的に説明するが、勿論これらに限定するものではない。なお例中の部及び%は特に断らない限りそれぞれ有効成分または固形分の重量部、重量%を示す。
【0034】
実施例1
NBKP80部とLBKP20部とからなる、カナディアン・スタンダード・フリーネス230mlのパルプスラリー中に、絶乾パルプに対してサイズ剤としてロジンサイズ(商品名:サイズパインE、荒川化学工業社製)0.4%、硫酸バンド2.4%を添加し定着させた後、長網抄紙機で抄紙濃度0.3%で抄紙し、オンマシンサイズプレスコーターにて、カオリン(商品名:HTクレー、エンゲルハード社製)をサンドグラインダーで粉砕し、篩により粒子径0.3μmを超える部分を除去したもの100部とポリビニルアルコール(商品名:PVA117、クラレ社製)100部の5%混合液を、塗工量が片面0.8g/m2 となるように塗工して坪量70g/m2 、水分12%のグラシン原紙を得た。
【0035】
この原紙を金属ロールと弾性ロールとからなる多段式カレンダーを用いてスーパーカレンダー掛けをおこなった。この時金属ロールの温度は最上段の80℃から下段にいくにしたがい徐々に温度を上げ、最下段を130℃とし、加圧線圧は170kg/cmとした。これにより、緊度1.08g/cm3、ベック平滑度800秒/10ml、ガーレ高圧透気度10000秒/100ml以上のグラシン紙を得た。
【0036】
得られた剥離紙用基体のフェルト面上に、付加反応型シリコーン(商品名:KS3752、信越化学社製)5.8部、白金触媒(商品名:CAT−PL−8、信越化学社製)、トルエン94部を混合撹拌して得られた離型層用塗液を、メイヤーバーにより乾燥重量で1.0g /m2となるよう塗布、乾燥し剥離紙を得た。
【0037】
この剥離紙にアクリルエマルジョン型粘着剤(商品名:ニカゾールL144、日本カーバイト社製)をリバースロールコーターで乾燥重量で22g/m2 となるように塗工し、乾燥させた後、坪量64g/m2 の上質紙を貼り合わせて粘着紙を得た。得られた粘着紙についてバリヤ−性、糊残り、剥離力、光電管適性、再離解性を評価し、その結果を表1に示した。
【0038】
実施例2
実施例1において、カオリンを炭酸カルシウム(商品名:ハイドロカーブK−9、備北粉化工業社製)に変更した以外は、実施例1と同様にグラシン紙、剥離紙、粘着紙を得た。その際に得られた炭酸カルシウムは篩により0.3μmを超える部分を除去して用いた。得られた粘着紙について、実施例1と同様にバリヤ−性、糊残り、剥離力、光電管適性、再離解性を評価し、その結果を表1に示した。
【0039】
実施例3
実施例1において、カオリンを粒子径0.1μm以下のコロイダルシリカ(商品名:スノーテックスN、日産化学社製)に変更した以外は、実施例1と同様にグラシン紙、剥離紙、粘着紙を得た。得られた粘着紙について、実施例1と同様にバリヤー性、糊残り、剥離力、光電管適性、再離解性を評価し、その結果を表1に示した。
【0040】
実施例4
実施例1において、ポリビニルアルコール(商品名:PVA117、クラレ社製)をポリビニルアルコール(商品名:PC2000、電気化学工業社製)に変更した以外は、実施例1と同様にグラシン紙、剥離紙、粘着紙を得た。得られた粘着紙について、実施例1と同様にバリヤ−性、糊残り、剥離力、光電管適性、再離解性を評価し、その結果を表1に示した。
【0041】
実施例5
実施例1において、ポリビニルアルコール(商品名:PVA117、クラレ社製)100部をアセトアセチル基変成ポリビニルアルコール(商品名:Z−200、日本合成化学社製)50部に変更した以外は、実施例1と同様にグラシン紙、剥離紙、粘着紙を得た。得られた粘着紙について、実施例1と同様にバリヤ−性、糊残り、剥離力、光電管適性、再離解性を評価し、その結果を表1に示した。
【0042】
実施例6
実施例1において、ポリビニルアルコール(商品名:PVA117、クラレ社製)100部を300部に変更した以外は、実施例1と同様にグラシン紙、剥離紙、粘着紙を得た。得られた粘着紙について、実施例1と同様にバリヤ−性、糊残り、剥離力、光電管適性、再離解性を評価し、その結果を表1に示した。
【0043】
比較例1
実施例1において、カオリン(商品名:HTクレー、エンゲルハード社製)の粒子径を1.0μm以下に変更した以外は、実施例1と同様にグラシン紙、剥離紙、粘着紙を得た。得られた粘着紙について、実施例1と同様にバリヤ−性、糊残り、剥離力、光電管適性、再離解性を評価し、その結果を表1に示した。
【0044】
比較例2
実施例2において、炭酸カルシウム(商品名:ハイドロカーブK−9、備北粉化社製)の粒子径を1.3μm以下に変更した以外は、実施例2と同様にグラシン紙、剥離紙、粘着紙を得た。得られた粘着紙について、実施例2と同様にバリヤ−性、糊残り、剥離力、光電管適性、再離解性を評価し、その結果を表1に示した。
【0045】
比較例3
実施例1において、ポリビニルアルコール(商品名:PVA117、クラレ社製)をスチレン・ブタジエン共重合体ラテックス(商品名:L−1571、旭化成社製)に変更した以外は、実施例1と同様にグラシン紙、剥離紙、粘着紙を得た。得られた粘着紙について、実施例1と同様にバリヤ−性、糊残り、剥離力、光電管適性、再離解性を評価し、その結果を表1に示した。
【0046】
比較例4
比較例1において、ポリビニルアルコール(商品名:PVA117、クラレ社製)をアクリル酸エステル共重合体エマルジョン(商品名:リカボンドET−84、中央理化社製)に変更した以外は、実施例1と同様にグラシン紙、剥離紙、粘着紙を得た。得られた粘着紙について、実施例1と同様にバリヤ−性、糊残り、剥離力、光電管適性、再離解性を評価し、その結果を表1に示した。
【0047】
比較例5
実施例1においてサイズプレスコーターでの塗工液をポリビニルアルコール(商品名:PVA117、クラレ社製)のみとした以外は、実施例1と同様にグラシン紙、剥離紙、粘着紙を得た。得られた粘着紙について、実施例1と同様にバリヤ−性、糊残り、剥離力、光電管適性、再離解性を評価し、その結果を表1に示した。
【0048】
比較例6
実施例1においてサイズプレスコーターでの塗工液をポリビニルアルコール(商品名:PVA117、クラレ社製)のみとし、その後グラシン紙上に溶融した低密度ポリエチレン(住友化学工業社製)を溶融押出機によりラミネートし、ポリラミグラシン紙を得た以外は実施例1と同様に剥離紙、粘着紙を得た。得られた粘着紙について、実施例1と同様にバリヤ−性、糊残り、剥離力、光電管適性、再離解性を評価し、その結果を表1に示した。
【0049】
実施例および比較例で得られた、粘着紙、剥離紙および剥離紙用基体(離型剤塗布前)について、次に説明する各評価試験を行った。
(1)バリヤ−性
得られた剥離紙用基体(離型剤塗布前)上に「Oleosol Red B」(住友化学工業社性)で着色したトルエンを塗布し、2秒後ガ−ゼで拭き取りその面のトルエンの浸透状態およびピンホ−ルの目止め効果を評価した。
(評価基準)
◎:浸透/ピンホ−ルが全く見られなかった。
〇:浸透/ピンホ−ルがやや見られるが実用上問題ないレベルである。
△:浸透/ピンホ−ルがかなり見られ実用上問題のあるレベルである。
×:浸透/ピンホ−ルが全面に見られた。
【0050】
(2)糊残り
得られた粘着紙をシール印刷機により印刷、ダイカット(打ち抜き)、粕取りを行い、剥離剤層表面に当たるガイドロールへの粘着剤の付着度合いを目視判定した。
(評価基準)
〇:ガイドロールへの糊の付着が全く見られない。
△:ガイドロールへの糊の付着がやや見られる。
×:ガイドロールへの糊の付着が多く見られる。
【0051】
(3)剥離力
粘着紙についてマシンの流れ方向を長辺とする10cm×5cmのサンプルを調製し、INTESCO MODEL 2001で剥離速度0.3m/分の試験条件で流れ方向に180度の引張角度で剥離させた時の剥離力を測定した。
【0052】
(4)光電管適性
ラベルに仕上げた粘着ラベルをオートラベラーで紙送り検出機の光電管が光を通し、検出可能か確認した。
(評価基準)
〇:光電管での検出が可能である
×:光電管での検出が不可能である
【0053】
(5)離解性
古紙再生パルプ化における離解性について、得られた剥離紙を、JISP8209に規定される標準離解機による離解処理をし、カウント数5000でのパルプの分散状態を観察してその離解性を評価した。
(評価基準)
○:完全に離解できている。
△:部分的に離解できていない。
×:全く離解できていない。
【0054】
【表1】

Figure 0003728845
【0055】
【発明の効果】
表1から明らかなように、本発明のグラシン紙は透過式位置検出機を有するラベラーでの位置検知に問題がなく、さらに原紙上にポリエチレンラミネートすることなく離型剤を塗布することができ、しかも古紙パルプとして再利用が可能で、糊残りのない剥離紙を提供できるグラシン紙である。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to glassine paper, and more particularly to glassine paper suitable for a base material of release paper used for adhesive paper. More specifically, there is no problem in position detection with a labeler having a transmission type position detector, and a release agent can be applied without polyethylene lamination on the base paper, and it can be reused as waste paper pulp. The present invention relates to glassine paper that can provide a release paper having no adhesive residue.
[0002]
[Prior art]
Adhesive paper is used as labels, stickers, stickers, emblems, etc. for a wide range of uses such as commercial use, office use, and home use. This pressure-sensitive adhesive paper is generally constructed by laminating a surface base material, a pressure-sensitive adhesive, and a release paper in this order. Paper, film, metal foil, etc. are used for the surface substrate, and release paper is made of high-density paper such as glassine paper, release paper base paper such as clay-coated paper, polyethylene laminate paper, etc., with a release agent such as silicone compound or fluorine compound. The coated one is used. Moreover, a solvent-type adhesive, an emulsion-type adhesive, a hot-melt-type adhesive, etc. are used for an adhesive.
[0003]
As the release paper, polyethylene laminate type, glassine type, clay coat type, etc. are known, and release of silicone resin etc. on the surface of high quality paper, single glossy paper and kraft paper made mainly from these wood pulp For the purpose of suppressing the penetration of the agent solution as much as possible and maximizing the performance of the release agent, a film formed with a polyethylene resin film layer is generally used. However, in the above-mentioned polyethylene laminate type, since this polyethylene resin forms a strong continuous film and it is insoluble in water, this substrate cannot be recovered again and recycled in the papermaking process. Today it is a big problem in industrial waste disposal.
[0004]
For this reason, Japanese Patent Publication No. 1-35959 and Japanese Patent Application Laid-Open No. 4-23876 disclose an inorganic pigment and an organic adhesive on the surface of a base paper as a base material for a release paper obtained by directly applying a release agent solution. A clay coat type substrate is disclosed in which an undercoat layer is formed by applying a paint as a main component. In such a base material, the effect of covering the minute voids in the base paper with the undercoat layer is recognized. However, since high-quality paper or kraft paper is used as the release paper substrate, the light transmission is poor, and there is a problem in position detection with a labeler having a transmission type position detector.
[0005]
The glassine type is made by using chemical pulp that has been subjected to advanced beating treatment as a raw material, and further provided with a release agent such as silicone on glassine paper obtained by densification using finishing equipment such as a super calender. Since the glassine type release paper is excellent in light transmittance, it has an advantage that can be applied to a labeler having a transmission type position detector. Further, since the release paper has a relatively thin paper thickness, it has a feature that the yield can be increased to a large area with respect to the required winding diameter and case.
[0006]
Glassine paper as a release paper base sheet is coated with a coating composition containing a water-soluble polymer as a main component in order to prevent the release agent from penetrating into the base sheet. Examples of the coating method include a scraping method represented by bar coating and blade coating on the surface of glassine paper, and a roll coater represented by size press and gate roll. When the scraping method is used, it is possible to prevent the penetration into the base sheet, and it is possible to obtain glassine paper having a good barrier property.
[0007]
However, glassine paper is effectively used for position detection by a phototube device using its transparency, and in the above scraping method, the coating composition is formed on the base paper, and then into the substrate. Since it is not filled, there is a problem that sufficient transparency cannot be obtained and position detection by a phototube becomes difficult.
[0008]
On the other hand, glassine paper coated on both sides or one side by a size press or a gate method is filled with the coating composition to the inside of the base sheet, and light scattering is reduced, so that the light transmission is excellent. However, in the case of this coating method, on the contrary, a large amount of coating composition is required because the coating composition is filled in the base sheet, and in this case, as a raw material for recycled paper, it is easy to disassemble. Cannot be redispersed in water. In addition, the penetration of the release agent and the covering (coverability) of the substrate sheet surface to the release agent were insufficient.
[0009]
In such a state, when an adhesive is applied to a release paper composed of a base sheet and a release agent layer, the adhesive enters a pinhole or a recess of the release agent layer. In this state, the adhesive sheet is finished, and then the surface substrate to which the adhesive is attached is peeled off from the release agent layer, whereby a phenomenon that the adhesive remains on the release paper (hereinafter referred to as adhesive residue) is observed.
[0010]
This adhesive residue phenomenon is a process in which an adhesive sheet is used for form printing or seal printing. When printing, die-cutting (punching), wrinkling, etc., the adhesive adheres to the guide roll that hits the surface of the release agent layer. It causes troubles such as defects and printing misalignment, which becomes a very serious obstacle to workability and quality. Further, even in a process of printing or labeling with an auto labeler, a handler labeler, etc., adhesive residue on the surface of the release agent layer, such as paper feed failure and printing misalignment, also becomes a problem. Also, the peeling force tends to increase. In order to improve this problem, it is important to further improve the barrier property of the glassine paper as the base sheet.
[0011]
[Problems to be solved by the invention]
Therefore, the object of the present invention is that there is no problem in position detection with a labeler having a transmission type position detector, and furthermore, it is possible to apply a release agent without laminating polyethylene on the base paper, eliminating adhesive residue. The present invention relates to glassine paper capable of providing a release paper that has improved workability in a printing process and a labeling process and can be reused as waste paper pulp.
[0012]
[Means for Solving the Problems]
As a result of intensive research in view of the present situation, the inventors of the present invention have achieved the object of the present invention by constituting the undercoat layer of glassine paper mainly composed of a pigment having a particle diameter of 0.4 μm or less and a water-soluble polymer. The inventors have found that this can be achieved and have completed the present invention.
[0013]
As a result of research, the present inventors have used a chemical pulp that has been subjected to a high level of beating treatment, applied a polyvinyl alcohol resin aqueous solution to the surface of the base paper, and further densified with a super calender, etc. It is not possible to obtain release performance comparable to the type, and the clay coat type can provide barrier properties that suppress the penetration of the release agent solution, but the position on the labeler that has poor transparency and has a transmission type position detector. I knew it was inappropriate for detection.
[0014]
The main component of the undercoat layer of glassine paper, which is a release paper that achieves both sufficient barrier properties and transparency required for position detection with a transmission type position detector, has a particle size of 0.4 μm or less. A glassine paper comprising a pigment and a water-soluble polymer.
[0015]
Further, the present invention provides a glassine paper in which an undercoat layer is provided on one side or both sides of a base paper and is made transparent by pressure treatment, and the undercoat layer contains a pigment having a particle diameter of 0.4 μm or less and a water-soluble polymer. A glassine paper for release paper, characterized in that the main component is 30 to 500 parts by weight of a water-soluble polymer with respect to 100 parts by weight of the pigment. Furthermore, in the present invention, the coating amount of the undercoat layer is 0.3 to 3.0 g / m per side in solid content. 2 It is a glassine paper for release paper characterized by being.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
The glassine paper for release paper of the present invention is composed of a pigment having a particle diameter of 0.4 μm or less and a water-soluble high component whose main component of the undercoat layer is a sphere equivalent diameter manufactured by Nikka Co., Ltd .: COULTER model N4SD SUB-MICRON PARTICLEANALYZER It is characterized by having molecules as the main component. The particle diameter of the pigment in the undercoat layer in the present invention needs to be 0.4 μm or less. The part where the particle diameter of the pigment exceeds 0.4 μm is removed by means such as a sieve. By doing so, the particle diameter of the pigment becomes shorter than the wavelength range of visible light visible to human eyes, that is, 400 nm to 700 nm, and the appearance becomes transparent. The phototube detection wavelength region of a labeler having a transmission type position detector is approximately 800 nm to 1000 nm, although it varies depending on the model. On the other hand, the particle size of the pigment that is usually used is 1 to 3 μm, and the release paper becomes opaque due to the effect of the pigment, and the photocell of the labeler cannot detect light, and has a transmission type position detector. Cannot be used.
[0017]
The glassine paper of the present invention has a pigment particle diameter of 0.4 μm or less, so that the pigment becomes a particle shorter than the wavelength of the phototube of the labeler, and the light of the phototube can be transmitted. It becomes possible. In order to ensure this, the glass floor of the glassine paper after coating is approximately 20-100 g / m 2 It is preferable to set it as the range.
[0018]
As a result of intensive studies on the adhesive residue, the present inventors have found that the adhesive residue is a phenomenon that occurs when only a water-soluble polymer is used as a barrier agent, as in conventional glassine paper. We have found that this does not happen when molecules are the main component.
It was found that the barrier property against the solvent is divided into pinholes, which are determined by how the solvent detaches from the back surface, and penetration, which indicates the degree of penetration into the barrier layer, and the adhesive residue is related to the pinholes. That is, when the pinhole is good, the adhesive residue is also good.
[0019]
Usually, the barrier property is improved when the amount of the binder component such as a water-soluble polymer is large, but the penetration is reduced, but the pinhole is not good. This is particularly noticeable when using a size press such as glassine paper. In the present invention, it was found that glassine paper having a barrier property with no pinholes and good permeation preventing ability can be obtained by adding a pigment having a prescribed particle size, and as a result, an adhesive residue when used as an adhesive sheet. To provide a release paper that has very few phenomena, has no problem with position detection with a labeler, and can be applied with a release agent without being laminated with polyethylene on the base paper, and can be reused as waste paper pulp. A glassine paper was obtained.
[0020]
In general, glassine paper is mainly composed of softwood chemical pulp as a papermaking raw material. Specific examples of pulp include, for example, chemical pulp made of coniferous materials such as spruce and hemlock, but other than that, chemical pulp made of hardwood materials, mixed pulp of mechanical pulp, waste paper, synthetic pulp, etc. Used as appropriate.
[0021]
In addition, various auxiliary agents such as sizing agents, paper strength enhancers, yield improvers, dyes and other papermaking chemicals are added to the papermaking raw materials as necessary. If the pulp is beaten to 150 ml or less with Canadian Standard Freeness, the oil resistance and transparency will be improved. However, since problems with papermaking and humidity dimensional stability are likely to occur, the medium beating (200 to 300 ml) should be kept at a level of 200 to 300 ml. The method to be taken is taken.
[0022]
Examples of the water-soluble polymer in the present invention include starches such as oxidized starch and positive starch, carboxymethyl cellulose, and polyvinyl alcohol. Polyvinyl alcohol is particularly preferable because of its excellent barrier properties. Polyvinyl alcohol is used by appropriately selecting the degree of saponification and the degree of polymerization, and various modified polyvinyl alcohols such as carboxyl group-modified and acetoacetyl group-modified can also be used effectively. The number of parts used is preferably 30 to 500 parts by weight with respect to 100 parts by weight of the pigment, and if it is less than 30 parts by weight, the effect of preventing pinholes with respect to the solvent is high, but the effect of preventing penetration is poor. On the other hand, if it exceeds 500 parts by weight, the effect of preventing penetration is exhibited, but the effect of preventing pinhole is low.
[0023]
Any pigment having a particle size of 0.4 μm or less can be used. For example, colloidal silica, kaolin, clay, aluminum hydroxide, heavy calcium carbonate, light calcium carbonate, satin white, talc, plastic pigment, etc. These pigments are appropriately selected and used. Of course, two or more pigments can be used in combination. Although it is desirable to purchase a pigment having a particle size of 0.4 μm or less, depending on the case, the purchased pigment can be classified with a sieve or the like, or classified after dry or wet pulverization. For classification, other known means can be employed.
[0024]
Further, a lubricant can be used as long as the object of the present invention is not impaired. For example, hydrocarbon-based, fatty acid-based, fatty acid amide-based, ester-based, alcohol-based, metal soap and the like are used. Specific examples include liquid paraffin, natural paraffin, microwax, polyethylene wax, etc. for hydrocarbons, stearic acid, lauric acid for fatty acids, stearic acid amide, palmitic acid amide, methylenebisstearamide, ethylene for fatty acid amides. For example, bis stearamide, butyl stearate, hydrogenated castor oil, ethylene glycol monostearate, etc. for esters, cetyl alcohol, stearyl alcohol, etc. for alcohols, lead stearate, zinc stearate, calcium stearate, etc. for metal soaps Is exemplified.
[0025]
Furthermore, as long as the object of the present invention is not impaired, various auxiliary agents such as an antifoaming agent, a colorant, a flow modifier, a water-proofing agent, an oil-proofing agent, and a curing agent are appropriately blended as necessary. The above auxiliary agents can be used in combination.
[0026]
In the present invention, when the coating composition is applied onto glassine base paper, the coating amount is 0.3 to 3.0 g / m per side in solid content. 2 , More preferably 0.8 to 2.0 g / m 2 Adjusted by degree. Incidentally, 0.3g / m 2 If it is less than 1, the effect of eliminating pinholes and imparting barrier properties will be insufficient. Meanwhile, 3.0 g / m 2 If it exceeds 1, the desired effect will be saturated, and if it exceeds this, the burden will be too much on the economical efficiency and the coating surface.
[0027]
As the supercalender used in the present invention, a device capable of applying a pressurized linear pressure of 100 kg / cm or more to the nip portion where the surface temperature of at least one metal roll is heated to a temperature range of 80 to 200 ° C. As long as it can be adopted as appropriate. For example, a Magna power calendar, a two-stage calendar, a multistage calendar, etc. manufactured by Belmatic are listed. Incidentally, if it is less than 80 ° C., transparency and smoothness desired as glassine paper cannot be obtained. On the other hand, if it is 200 degreeC or more, the burden to a metal roll becomes large and is unpreferable. Moreover, if it is less than 100 kg / cm, transparency and smoothness desired as glassine paper cannot be obtained.
[0028]
The tension of glassine paper is 1.00 to 1.25 g / cm. Three , More preferably 1.05-1.20 g / cm Three This value is considerably higher than that of ordinary fine paper. Incidentally, 1.00 g / cm Three If it is less than this, the transparency and smoothness desired as glassine paper cannot be obtained. For this reason, when the release agent is applied, the covering of the release agent becomes worse and pinholes or the like are likely to be formed on the release paper. Although this drawback can be eliminated by using a large amount of release agent, the use of a large amount of release agent is problematic in terms of economy. Meanwhile, 1.25 g / cm Three Exceeding the distance between the fibers becomes smaller, and if left in a humid atmosphere, moisture is absorbed into the fibers, making it impossible to absorb the strain between the fibers due to the expansion of the fibers, causing curling and dimensional changes, and release agents and adhesives. The coating suitability and workability are undesirably lowered during coating, further during printing and labeling.
[0029]
The release paper of the present invention is produced by directly applying a release agent to the coated paper obtained as described above and drying it. As the release agent, a silicone resin release agent is preferably used. As the silicone resin release agent, a solvent-based silicone resin, a solvent-free silicone resin such as an ultraviolet curable type or an electron beam curable type is appropriately selected and used. Coated according to law. In addition, the amount of silicone resin applied is 0.3 to 3.0 g / m in dry weight in consideration of recycling as recycled recycled paper. 2 It is desirable to adjust so as to be within a range. 0.3 g / m 2 If less than, the desired peeling force cannot be obtained, and 3.0 g / m 2 If it exceeds, the effect is saturated, which is not economically preferable.
[0030]
Furthermore, as a coating apparatus for forming a release agent layer, various coaters for general release agent application such as a roll coater, a bar coater, and a gravure coater, a printing machine, and the like are appropriately used.
[0031]
In addition, the method of using the release paper of the present invention as an adhesive paper is, for example, a rubber system such as natural rubber, styrene-butadiene copolymer, styrene-isoprene block copolymer, recycled rubber, and synthetic rubber according to a conventional method. Adhesives such as acrylic and silicone are appropriately used. These pressure-sensitive adhesives are applied in the form of a solvent system, an aqueous emulsion system, a hot melt system, a liquid curable type, etc., for example, by a knife coater, roll coater, die coater, gravure coater, screen printing or the like. The coating amount in this case is 10 to 40 g / m in dry weight. 2 , More preferably 15-25 g / m 2 Adjusted to the extent of the degree. Incidentally, 10g / m 2 If it is less than 40 g / m, the effect as an adhesive layer is poor. 2 Exceeding the value saturates the effect and is not economically preferable.
[0032]
Examples of the surface substrate include cast-coated paper, art paper, coated paper, high-quality paper, thermal paper, synthetic paper, vapor-deposited paper, cloth, nonwoven fabric, metal foil, various polymer films, etc. Can be used as appropriate.
[0033]
【Example】
Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to these examples. In addition, unless otherwise indicated, the part and% in an example show the weight part and weight% of an active ingredient or solid content, respectively.
[0034]
Example 1
Rosin size (trade name: Size Pine E, manufactured by Arakawa Chemical Co., Ltd.) 0.4% as a sizing agent in a 230 ml Canadian Standard Freeness pulp slurry consisting of 80 parts NBKP and 20 parts LBKP. After adding and fixing 2.4% sulfuric acid band, paper was made with a long paper machine at a paper density of 0.3%, and kaolin (trade name: HT clay, manufactured by Engelhard, Inc.) with an on-machine size press coater. ) Is crushed with a sand grinder, and a 5% mixed solution of 100 parts obtained by removing the part exceeding the particle diameter of 0.3 μm with a sieve and 100 parts of polyvinyl alcohol (trade name: PVA117, manufactured by Kuraray Co., Ltd.) Single side 0.8g / m 2 The basis weight is 70g / m 2 A glassine base paper having a water content of 12% was obtained.
[0035]
The base paper was supercalendered using a multistage calendar composed of a metal roll and an elastic roll. At this time, the temperature of the metal roll was gradually increased from 80 ° C. at the uppermost stage to the lower stage, the lowermost stage was set at 130 ° C., and the pressure linear pressure was set at 170 kg / cm. As a result, the tension is 1.08 g / cm. Three A glassine paper having a Beck smoothness of 800 seconds / 10 ml and a Gurley high-pressure air permeability of 10,000 seconds / 100 ml or more was obtained.
[0036]
5.8 parts of addition reaction type silicone (trade name: KS3752, manufactured by Shin-Etsu Chemical Co., Ltd.), platinum catalyst (trade name: CAT-PL-8, manufactured by Shin-Etsu Chemical Co., Ltd.) on the felt surface of the obtained release paper substrate. The release layer coating solution obtained by mixing and stirring 94 parts of toluene was 1.0 g / m in dry weight with a Mayer bar. 2 It was applied and dried so that a release paper was obtained.
[0037]
Acrylic emulsion type pressure-sensitive adhesive (trade name: Nicazole L144, manufactured by Nippon Carbide Co., Ltd.) was applied to this release paper with a reverse roll coater at a dry weight of 22 g / m. 2 After coating and drying, a basis weight of 64 g / m 2 Adhesive paper was obtained by laminating high-quality paper. The resulting adhesive paper was evaluated for barrier properties, adhesive residue, peeling force, phototube suitability, and re-disintegration properties, and the results are shown in Table 1.
[0038]
Example 2
In Example 1, glassine paper, release paper, and adhesive paper were obtained in the same manner as in Example 1 except that kaolin was changed to calcium carbonate (trade name: Hydrocurve K-9, manufactured by Bihoku Powder Chemical Co., Ltd.). The calcium carbonate obtained at that time was used after removing a portion exceeding 0.3 μm with a sieve. The obtained adhesive paper was evaluated in the same manner as in Example 1 for barrier properties, adhesive residue, peeling force, phototube suitability, and re-disintegrating property, and the results are shown in Table 1.
[0039]
Example 3
In Example 1, glassine paper, release paper, and adhesive paper were used in the same manner as in Example 1 except that kaolin was changed to colloidal silica (trade name: Snowtex N, manufactured by Nissan Chemical Co., Ltd.) having a particle size of 0.1 μm or less. Obtained. The obtained adhesive paper was evaluated in the same manner as in Example 1 for barrier properties, adhesive residue, peeling force, phototube suitability, and re-disaggregation properties, and the results are shown in Table 1.
[0040]
Example 4
In Example 1, glassine paper, release paper, and the like, except that polyvinyl alcohol (trade name: PVA117, manufactured by Kuraray Co., Ltd.) was changed to polyvinyl alcohol (trade name: PC2000, manufactured by Denki Kagaku Kogyo Co., Ltd.) An adhesive paper was obtained. The obtained adhesive paper was evaluated in the same manner as in Example 1 for barrier properties, adhesive residue, peeling force, phototube suitability, and re-disintegrating property, and the results are shown in Table 1.
[0041]
Example 5
In Example 1, except that 100 parts of polyvinyl alcohol (trade name: PVA117, manufactured by Kuraray Co., Ltd.) was changed to 50 parts of acetoacetyl group-modified polyvinyl alcohol (trade name: Z-200, manufactured by Nippon Synthetic Chemical Co., Ltd.) Glassin paper, release paper, and adhesive paper were obtained in the same manner as in 1. The obtained adhesive paper was evaluated in the same manner as in Example 1 for barrier properties, adhesive residue, peeling force, phototube suitability, and re-disintegrating property, and the results are shown in Table 1.
[0042]
Example 6
Glassin paper, release paper, and adhesive paper were obtained in the same manner as in Example 1 except that 100 parts of polyvinyl alcohol (trade name: PVA117, manufactured by Kuraray Co., Ltd.) was changed to 300 parts. The obtained adhesive paper was evaluated in the same manner as in Example 1 for barrier properties, adhesive residue, peeling force, phototube suitability, and re-disintegrating property, and the results are shown in Table 1.
[0043]
Comparative Example 1
Glassin paper, release paper, and adhesive paper were obtained in the same manner as in Example 1 except that the particle size of kaolin (trade name: HT clay, manufactured by Engelhard) was changed to 1.0 μm or less. The obtained adhesive paper was evaluated in the same manner as in Example 1 for barrier properties, adhesive residue, peeling force, phototube suitability, and re-disintegrating property, and the results are shown in Table 1.
[0044]
Comparative Example 2
In Example 2, glassine paper, release paper, and adhesive were used in the same manner as in Example 2 except that the particle size of calcium carbonate (trade name: Hydrocurve K-9, manufactured by Bihoku Powder Chemical Co., Ltd.) was changed to 1.3 μm or less. I got paper. The obtained adhesive paper was evaluated in the same manner as in Example 2 for barrier properties, adhesive residue, peeling force, phototube suitability, and re-disintegrating property, and Table 1 shows the results.
[0045]
Comparative Example 3
Glassin is the same as in Example 1 except that polyvinyl alcohol (trade name: PVA117, manufactured by Kuraray Co., Ltd.) is changed to styrene-butadiene copolymer latex (trade name: L-1571, manufactured by Asahi Kasei Co., Ltd.). Paper, release paper, and adhesive paper were obtained. The obtained adhesive paper was evaluated in the same manner as in Example 1 for barrier properties, adhesive residue, peeling force, phototube suitability, and re-disintegrating property, and the results are shown in Table 1.
[0046]
Comparative Example 4
In Comparative Example 1, the same procedure as in Example 1 was performed except that polyvinyl alcohol (trade name: PVA117, manufactured by Kuraray Co., Ltd.) was changed to an acrylate copolymer emulsion (trade name: Ricabond ET-84, manufactured by Chuo Rika Co., Ltd.). Glassin paper, release paper, and adhesive paper were obtained. The obtained adhesive paper was evaluated in the same manner as in Example 1 for barrier properties, adhesive residue, peeling force, phototube suitability, and re-disintegrating property, and the results are shown in Table 1.
[0047]
Comparative Example 5
Glassin paper, release paper, and adhesive paper were obtained in the same manner as in Example 1 except that only the polyvinyl alcohol (trade name: PVA117, manufactured by Kuraray Co., Ltd.) was used as the coating solution in the size press coater in Example 1. About the obtained adhesive paper, the barrier property, adhesive residue, peeling force, phototube suitability, and re-disintegration property were evaluated in the same manner as in Example 1, and the results are shown in Table 1.
[0048]
Comparative Example 6
In Example 1, the coating solution in the size press coater was only polyvinyl alcohol (trade name: PVA117, manufactured by Kuraray Co., Ltd.), and then low density polyethylene (manufactured by Sumitomo Chemical Co., Ltd.) melted on glassine paper was laminated by a melt extruder. Then, a release paper and an adhesive paper were obtained in the same manner as in Example 1 except that the polylamiglassin paper was obtained. The obtained adhesive paper was evaluated in the same manner as in Example 1 for barrier properties, adhesive residue, peeling force, phototube suitability, and re-disintegrating property, and the results are shown in Table 1.
[0049]
The following evaluation tests were performed on the adhesive paper, release paper, and release paper substrate (before release agent application) obtained in the examples and comparative examples.
(1) Barrier property
Toluene colored with “Olesol Red B” (manufactured by Sumitomo Chemical Co., Ltd.) was applied on the obtained release paper substrate (before application of the release agent), wiped with gauze after 2 seconds, and penetration of toluene on the surface. The sealing effect of the condition and pinhole was evaluated.
(Evaluation criteria)
A: No penetration / pinhole was observed.
○: Slight penetration / pinhole is observed, but at a level that does not cause any practical problems.
Δ: Penetration / pinhole is considerably observed, and there is a practically problematic level.
X: Penetration / pinhole was observed on the entire surface.
[0050]
(2) Adhesive residue
The obtained adhesive paper was printed, die-cut (punched), and wrinkled by a seal printer, and the degree of adhesion of the adhesive to the guide roll hitting the surface of the release agent layer was visually determined.
(Evaluation criteria)
◯: Adhesive adhesion to the guide roll is not seen at all.
Δ: Adhesion of glue to the guide roll is slightly seen.
X: Adhesion of glue on the guide roll is often observed.
[0051]
(3) Peeling force
A sample of 10cm x 5cm with the machine flow direction as the long side was prepared for the adhesive paper, and peeled off at 180 ° tensile angle in the flow direction under the test conditions of INTESCO MODEL 2001 with a peeling speed of 0.3m / min. The peel force was measured.
[0052]
(4) Phototube suitability
The photo-sensitive tube of the paper feed detector passed through the pressure-sensitive adhesive label finished on the label with an auto labeler, and it was confirmed that it could be detected.
(Evaluation criteria)
○: Detection by phototube is possible
×: Detection with a phototube is impossible
[0053]
(5) Disaggregation
About the disaggregation property in used paper recycled pulping, the obtained release paper was disaggregated by the standard disaggregator prescribed | regulated to JISP8209, the dispersibility of the pulp in 5000 counts was observed, and the disaggregation property was evaluated.
(Evaluation criteria)
○: Completely disaggregated.
Δ: Partially disaggregated.
X: Not disaggregated at all.
[0054]
[Table 1]
Figure 0003728845
[0055]
【The invention's effect】
As is clear from Table 1, the glassine paper of the present invention has no problem in position detection with a labeler having a transmission type position detector, and can be coated with a release agent without laminating polyethylene on the base paper, Moreover, it is a glassine paper that can be reused as waste paper pulp and can provide a release paper with no adhesive residue.

Claims (3)

原紙の片面あるいは両面に、下塗り層を設け、加圧処理して透明化させるグラシン紙において、該下塗り層が、コールターカウンターによる球相当径で現した粒子径が0.4μm以下の顔料と水溶性高分子を主成分とすることを特徴とする剥離紙基材シート用グラシン紙。In glassine paper, which is provided with an undercoat layer on one side or both sides of the base paper and is made transparent by pressurization, the undercoat layer is a water-soluble pigment and a pigment having a particle diameter of 0.4 μm or less expressed as a sphere equivalent diameter by a Coulter counter Glassine paper for release paper base sheet , characterized by comprising a polymer as a main component. 下塗り層がコールターカウンターによる球相当径で現した粒子径0.4μm以下の顔料100重量部に対して、水溶性高分子を30〜500重量部含有する請求項1記載の剥離紙基材シート用グラシン紙。2. The release paper base sheet according to claim 1, wherein the undercoat layer contains 30 to 500 parts by weight of a water-soluble polymer with respect to 100 parts by weight of a pigment having a particle diameter of 0.4 μm or less expressed as a sphere equivalent diameter by a Coulter counter . Glassine paper. 下塗り層の塗布量が、固形分で片面当たり0.3〜3.0g/mである請求項1または2記載の剥離紙基材シート用グラシン紙。The glassine paper for a release paper base sheet according to claim 1 or 2, wherein the coating amount of the undercoat layer is 0.3 to 3.0 g / m 2 per side in terms of solid content.
JP00147897A 1997-01-08 1997-01-08 Glassine paper for release paper base sheet Expired - Lifetime JP3728845B2 (en)

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US6670010B2 (en) 2001-07-23 2003-12-30 Ricoh Company, Ltd. Composite sheet, method of preparing same, and thermosensitive recording adhesive label sheet having same
US6846538B2 (en) 2001-12-27 2005-01-25 Ricoh Company, Ltd. Composite sheet, method of preparing same, and adhesive label sheet assembly having same
JP4520138B2 (en) * 2003-12-05 2010-08-04 日本製紙パピリア株式会社 Oil resistant paper
JP6954241B2 (en) * 2018-07-24 2021-10-27 王子ホールディングス株式会社 Release paper base paper and release paper
JP2023147622A (en) * 2022-03-30 2023-10-13 王子ホールディングス株式会社 Method for manufacturing sanitary tissue paper storage cartons

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